CN112564051A - Overheat protection control method, device and circuit, motor controller and household appliance - Google Patents
Overheat protection control method, device and circuit, motor controller and household appliance Download PDFInfo
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- CN112564051A CN112564051A CN202011381162.6A CN202011381162A CN112564051A CN 112564051 A CN112564051 A CN 112564051A CN 202011381162 A CN202011381162 A CN 202011381162A CN 112564051 A CN112564051 A CN 112564051A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/16—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for capacitors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/028—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the motor continuing operation despite the fault condition, e.g. eliminating, compensating for or remedying the fault
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/60—Controlling or determining the temperature of the motor or of the drive
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an overheating protection control method, an overheating protection control device, an overheating protection circuit, a motor controller and household electrical appliances of an electrolytic capacitor in the household electrical appliances, wherein the overheating protection control method of the electrolytic capacitor in the household electrical appliances comprises the following steps: obtaining the body temperature of the electrolytic capacitor; when the body temperature of the electrolytic capacitor is less than or equal to a first preset temperature, determining a temperature interval in which the body temperature of the electrolytic capacitor is located; and controlling the running frequency of the compressor at the rear end of the electrolytic capacitor in a segmented manner according to the temperature interval of the body temperature of the electrolytic capacitor. According to the overheat protection control method for the electrolytic capacitor in the household appliance, the overhigh temperature of the electrolytic capacitor body is effectively avoided, a good overheat protection effect is achieved, the service life of devices such as the electrolytic capacitor is prolonged, the maintenance frequency and the maintenance cost of the household appliance are reduced, and the normal work and the refrigeration effect of the household appliance are ensured.
Description
Technical Field
The present invention relates to the field of household appliance technologies, and in particular, to a method for controlling overheat protection of an electrolytic capacitor in a household appliance, a computer-readable storage medium, a motor controller, a device for controlling overheat protection of an electrolytic capacitor in a household appliance, a circuit for controlling overheat protection of an electrolytic capacitor in a household appliance, and a household appliance.
Background
In the related art, the failure of the electrolytic capacitor of the strong electric filter is mainly overheating failure, the failure of the electrolytic capacitor causes the complete machine to be incapable of running, and other devices of the electric control board are usually damaged together, the whole electric control board needs to be replaced, and the maintenance cost is high.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides an overheating protection control method for an electrolytic capacitor in household electrical appliance equipment, which effectively avoids the over-high temperature of the electrolytic capacitor body and achieves a good overheating protection effect.
The invention also provides a computer readable storage medium.
The invention also provides a motor controller capable of realizing the overheating protection control method.
The invention also provides an overheating protection control device of the electrolytic capacitor in the household appliance.
The invention also provides an overheating protection control circuit of the electrolytic capacitor in the household appliance.
The invention also provides household electrical appliance comprising the overheat protection control circuit.
In order to achieve the above object, an embodiment of the present invention provides a method for controlling overheat protection of an electrolytic capacitor in a household electrical appliance, including: obtaining the body temperature of the electrolytic capacitor; when the body temperature of the electrolytic capacitor is less than or equal to a first preset temperature, determining a temperature interval in which the body temperature of the electrolytic capacitor is located; and controlling the running frequency of the compressor at the rear end of the electrolytic capacitor in a segmented manner according to the temperature interval of the body temperature of the electrolytic capacitor.
According to the overheat protection control method for the electrolytic capacitor in the household appliance, when the body temperature of the electrolytic capacitor is less than or equal to the first preset temperature, the operation frequency of the compressor at the rear end of the electrolytic capacitor is controlled in a segmented mode according to the temperature interval of the electrolytic capacitor, the body temperature of the electrolytic capacitor is effectively prevented from being overhigh, a good overheat protection effect is achieved, the service life of devices such as the electrolytic capacitor is prolonged, the maintenance frequency and the maintenance cost of the household appliance are reduced, and the normal work and refrigeration effects of the household appliance are guaranteed.
In addition, the method for controlling the overheat protection of the electrolytic capacitor in the household electrical appliance according to the above embodiment of the present invention may further have the following additional technical features:
according to some embodiments of the present invention, the step of controlling the operation frequency of the compressor at the rear end of the electrolytic capacitor in a segmented manner according to the temperature interval of the body temperature of the electrolytic capacitor comprises: when the temperature of the body of the electrolytic capacitor is less than or equal to a second preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to operate at a first set frequency; when the temperature of the body of the electrolytic capacitor is higher than a second preset temperature and lower than or equal to a third preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to perform frequency reduction operation according to a first reduction rate; when the body temperature of the electrolytic capacitor is higher than a third preset temperature and lower than or equal to a fourth preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to operate at a second preset frequency, wherein the first preset frequency is higher than the second preset frequency; and when the temperature of the body of the electrolytic capacitor is higher than a fourth preset temperature and lower than or equal to a first preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to perform frequency reduction operation according to a second reduction rate.
According to some embodiments of the invention, when the body temperature of the electrolytic capacitor is higher than the first preset temperature, the compressor at the rear end of the electrolytic capacitor is also controlled to stop.
According to some embodiments of the invention, obtaining the bulk temperature of the electrolytic capacitor comprises: acquiring a maximum voltage value and a minimum voltage value at two ends of the electrolytic capacitor within a period of time, and calculating a voltage difference value at two ends of the electrolytic capacitor according to the maximum voltage value and the minimum voltage value; and calculating the body temperature of the electrolytic capacitor according to the voltage difference.
According to some embodiments of the invention, the bulk temperature of the electrolytic capacitor is calculated according to the following formula: and Δ U ═ k × T + a, where Δ U is the voltage difference, k is a preset coefficient, T is the bulk temperature of the electrolytic capacitor, and a is a preset compensation value.
According to some embodiments of the invention, the temperature of the electrolytic capacitor is detected by a temperature sensor to obtain the bulk temperature of the electrolytic capacitor.
According to some embodiments of the invention, the temperature sensor is an NTC thermistor or thermocouple.
In order to achieve the above object, an embodiment of the present invention provides a computer-readable storage medium, on which an overheat protection control program for an electrolytic capacitor in a home appliance is stored, and when the overheat protection control program for the electrolytic capacitor in the home appliance is executed by a processor, the method for controlling overheat protection of the electrolytic capacitor in the home appliance according to the embodiment of the present invention is implemented.
In order to achieve the above object, an embodiment of the present invention provides a motor controller, which includes a memory, a processor, and an overheat protection control program for an electrolytic capacitor in a household electrical appliance, where the overheat protection control program is stored in the memory and is executable on the processor, and when the processor executes the overheat protection control program, the overheat protection control method for the electrolytic capacitor in the household electrical appliance according to the embodiment of the present invention is implemented.
In order to achieve the above object, an embodiment of the present invention provides an overheat protection control device for an electrolytic capacitor in a household electrical appliance, including: the temperature acquisition module is used for acquiring the body temperature of the electrolytic capacitor; the determining module is used for determining a temperature interval in which the body temperature of the electrolytic capacitor is located when the body temperature of the electrolytic capacitor is less than or equal to a first preset temperature; and the overheating protection control module is used for controlling the operation frequency of the compressor at the rear end of the electrolytic capacitor in a segmented manner according to the temperature interval of the body temperature of the electrolytic capacitor.
According to the overheat protection control device for the electrolytic capacitor in the household appliance, when the body temperature of the electrolytic capacitor is less than or equal to the first preset temperature, the operation frequency of the compressor at the rear end of the electrolytic capacitor is controlled in a segmented mode according to the temperature interval of the electrolytic capacitor, the body temperature of the electrolytic capacitor is effectively prevented from being overhigh, a good overheat protection effect is achieved, the service life of devices such as the electrolytic capacitor is prolonged, the maintenance frequency and the maintenance cost of the household appliance are reduced, and the normal work and refrigeration effects of the household appliance are guaranteed.
In order to achieve the above object, an embodiment of the present invention provides an overheat protection control circuit for an electrolytic capacitor in a household electrical appliance, including: the temperature detection module is used for detecting the body temperature of the electrolytic capacitor; the control unit is connected with the temperature detection unit and used for judging the body temperature of the electrolytic capacitor so as to determine the temperature interval of the body temperature of the electrolytic capacitor when the body temperature of the electrolytic capacitor is less than or equal to a first preset temperature and perform sectional control on the running frequency of the compressor at the rear end of the electrolytic capacitor according to the temperature interval of the body temperature of the electrolytic capacitor.
According to the overheat protection control circuit of the electrolytic capacitor in the household appliance, when the temperature of the body of the electrolytic capacitor is less than or equal to the first preset temperature, the control unit controls the operation frequency of the compressor at the rear end of the electrolytic capacitor in a segmented manner according to the temperature interval of the electrolytic capacitor, so that the overhigh temperature of the body of the electrolytic capacitor is effectively avoided, a good overheat protection effect is achieved, the service life of devices such as the electrolytic capacitor is prolonged, the maintenance frequency and the maintenance cost of the household appliance are reduced, and the normal work and refrigeration effects of the household appliance are ensured.
According to some embodiments of the present invention, the control unit is further configured to control the compressor at the rear end of the electrolytic capacitor to operate at a first set frequency when the temperature of the body of the electrolytic capacitor is less than or equal to a second preset temperature; when the temperature of the body of the electrolytic capacitor is higher than a second preset temperature and lower than or equal to a third preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to perform frequency reduction operation according to a first reduction rate; when the body temperature of the electrolytic capacitor is higher than a third preset temperature and lower than or equal to a fourth preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to operate at a second preset frequency, wherein the first preset frequency is higher than the second preset frequency; and when the temperature of the body of the electrolytic capacitor is higher than a fourth preset temperature and lower than or equal to a first preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to perform frequency reduction operation according to a second reduction rate.
According to some embodiments of the invention, the control unit is further configured to control the compressor at the rear end of the electrolytic capacitor to stop when the body temperature of the electrolytic capacitor is greater than a first preset temperature.
According to some embodiments of the present invention, the temperature detection unit includes a voltage detection unit, the voltage detection unit is connected to the control unit, and the voltage detection unit is configured to detect a voltage across the electrolytic capacitor, wherein the control unit is further configured to calculate a voltage difference between a maximum voltage value and a minimum voltage value across the electrolytic capacitor within a period time according to the voltage across the electrolytic capacitor, and calculate a bulk temperature of the electrolytic capacitor according to the voltage difference.
According to some embodiments of the invention, the control unit calculates the bulk temperature of the electrolytic capacitor according to the formula: and Δ U ═ k × T + a, where Δ U is the voltage difference, k is a preset coefficient, T is the bulk temperature of the electrolytic capacitor, and a is a preset compensation value.
According to some embodiments of the invention, the temperature detection unit comprises: the temperature sensor is arranged corresponding to the electrolytic capacitor, and one end of the temperature sensor is connected with a preset power supply; one end of the first resistor is connected with the other end of the temperature sensor and is provided with a first node, and the other end of the first resistor is connected with the temperature sampling end of the control unit; one end of the second resistor is connected with the first node, and the other end of the second resistor is grounded; the positive electrode end of the first voltage-stabilizing capacitor is connected with the first node, and the other end of the first voltage-stabilizing capacitor is grounded; and one end of the first capacitor is connected with the other end of the first resistor, and the other end of the first capacitor is grounded.
According to some embodiments of the invention, the temperature sensor is an NTC thermistor disposed under the body of the electrolytic capacitor.
According to some embodiments of the invention, the temperature sensor is a thermocouple, the thermocouple being disposed inside the body of the electrolytic capacitor.
In order to achieve the above object, an embodiment of the present invention provides a household electrical appliance, including an overheat protection control circuit for an electrolytic capacitor in the household electrical appliance according to the embodiment of the present invention.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of an overheat protection control method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of voltage versus time for an electrolytic capacitor according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a method of obtaining bulk temperature of an electrolytic capacitor according to some embodiments of the invention;
FIG. 4 is a schematic diagram of an over-temperature protection control circuit according to some embodiments of the invention;
FIG. 5 is a schematic diagram of a temperature sensor and electrolytic capacitor in accordance with an embodiment of the present invention;
FIG. 6 is a schematic diagram of a temperature sensor and electrolytic capacitor in accordance with another embodiment of the present invention;
FIG. 7 is a schematic illustration of a staged reduction in compressor operating frequency of an overheat protection control method according to some embodiments of the present invention;
fig. 8 is a schematic diagram of an overheat protection control apparatus according to an embodiment of the present invention.
Description of the drawings:
an electrolytic capacitor 100;
an overheat protection control device 10; a temperature acquisition module 11; a determination module 12; an overheat protection control module 13;
an overheat protection control circuit 20;
a temperature detection unit 30; a temperature sensor 31; a first resistor 32; a second resistor 33; a first voltage stabilization capacitor 34; a first capacitor 35;
a control unit 40.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Electrolytic capacitors (such as high-capacity electrolytic capacitors of strong electric filters) in household appliances can store energy, so that direct-current voltage output by a rectifying circuit becomes stable. However, in the working process, the electrolytic capacitor in the related art is easily failed due to overheating, so that the whole machine cannot operate, and other devices of the electric control board are usually damaged together, so that the whole electric control board needs to be replaced, and the maintenance cost is high.
Therefore, the invention provides an overheating protection control method for an electrolytic capacitor in household electrical equipment, an overheating protection control device for the electrolytic capacitor in the household electrical equipment and an overheating protection control circuit for the electrolytic capacitor in the household electrical equipment, so as to perform overheating protection on the electrolytic capacitor, avoid temperature rise of the electrolytic capacitor caused by self or external factors, timely protect the electrolytic capacitor, improve the service life and reliability of the electrolytic capacitor, further improve the service life of the household electrical equipment and reduce the maintenance cost. The household appliance can be an air conditioner outdoor unit and the like.
An overheat protection control method of an electrolytic capacitor in a home appliance according to an embodiment of the present invention is described below with reference to the accompanying drawings.
As shown in fig. 1, the method for controlling the overheat protection of the electrolytic capacitor in the household electrical appliance according to the embodiment of the present invention includes steps S1 to S3.
S1: and acquiring the body temperature of the electrolytic capacitor.
In the embodiment of the present invention, the method of acquiring the bulk temperature of the electrolytic capacitor may include various methods.
In some embodiments of the present invention, the bulk temperature of the electrolytic capacitor may be detected from a voltage change of the electrolytic capacitor. As shown in fig. 2 and 3, the voltage across the electrolytic capacitor changes periodically with time, and the bulk temperature of the electrolytic capacitor can be obtained according to the maximum voltage value (denoted as Umax) and the minimum voltage value (denoted as Umin) across the electrolytic capacitor, which specifically includes S11 and S12:
s11: acquiring a maximum voltage value and a minimum voltage value at two ends of an electrolytic capacitor in a period of time, and calculating a voltage difference (marked as delta U, wherein the delta U is Umax-Umin) at the two ends of the electrolytic capacitor according to the maximum voltage value and the minimum voltage value;
s12: and calculating the body temperature of the electrolytic capacitor according to the voltage difference.
In some embodiments, the bulk temperature of the electrolytic capacitor may be calculated according to the following formula:
ΔU＝k*T+A
wherein, Δ U is a voltage difference value, k is a preset coefficient, T is a body temperature of the electrolytic capacitor, and a is a preset compensation value.
According to the formula, after the maximum voltage value and the minimum voltage value of the two ends of the electrolytic capacitor are determined, the body temperature of the electrolytic capacitor can be uniquely determined, and the temperature detection is simpler and more accurate. The change of the T value obtained by solving is fed back to control the running frequency change of the whole machine, so that the change of the electrolytic capacitor ripple is controlled in a reliable range, the temperature of the electrolytic capacitor is controlled in a safe running range, and the electrolytic capacitor is prevented from overheating and losing efficacy.
In other embodiments of the present invention, as shown in fig. 4, the temperature of the electrolytic capacitor may be detected by a temperature sensor to obtain the bulk temperature of the electrolytic capacitor.
For example, in some embodiments, as shown in FIG. 5, the temperature sensor is an NTC thermistor. NTC thermistors can be as small as 0.010 inches or a very small diameter, which is very convenient to install. The resistance value of an NTC thermistor rapidly decreases with increasing temperature, and it may be composed of two or three metal oxides, mixed in a fluid-like clay, and calcined in a high temperature furnace to form a dense sintered ceramic.
For example, as shown in fig. 4 and 5, the NTC thermistor, which has a characteristic that the resistance value rapidly decreases with the increase of temperature at a certain measurement power, is used to form a voltage dividing circuit with the resistance value thereof, so as to determine a voltage signal corresponding to the temperature. The voltage signal is stabilized by the first voltage stabilizing capacitor and is subjected to delay filtering by the first resistor and the first capacitor, so that a very clean electric signal is obtained and is input into a control unit (MCU processor). The control unit converts the electric signal to operate, so that the purposes of detecting and controlling the temperature are achieved.
For another example, in some embodiments, as shown in fig. 4 and 6, the temperature sensor is a thermocouple. The thermocouple can directly measure the temperature of the electrolytic circuit, obtain the body temperature of the electrolytic capacitor to be measured, and the temperature signal is converted into a thermal voltage signal. The voltage signal is stabilized through the first voltage stabilizing capacitor and is subjected to delay filtering through the first resistor and the first capacitor, so that a very clean electric signal is obtained and is input into the control unit. The control unit converts the electric signal to operate, so that the purposes of detecting and controlling the temperature are achieved.
As shown in fig. 1, S2: when the body temperature of the electrolytic capacitor is less than or equal to a first preset temperature, determining a temperature interval in which the body temperature of the electrolytic capacitor is located;
s3: and controlling the running frequency of the compressor at the rear end of the electrolytic capacitor in a segmented manner according to the temperature interval of the body temperature of the electrolytic capacitor.
When the body temperature of the electrolytic capacitor is less than or equal to the first preset temperature T1, it indicates that the body temperature of the electrolytic capacitor does not reach a safety threshold at which risks such as explosion, fire and the like can occur, and the household appliance can work normally. When the household electrical equipment normally works, the body temperature of the electrolytic capacitor is related to the whole machine current due to the existence of ripple current of the electrolytic capacitor, the larger the whole machine current is, the temperature rises, the smaller the whole machine current is, and the temperature drops.
Therefore, when the body temperature of the electrolytic capacitor is less than or equal to the first preset temperature T1, as shown in fig. 7, if the temperature rises, the operating frequency of the compressor can be reduced by stages, so as to reduce the current of the whole machine, reduce the body temperature of the electrolytic capacitor, avoid the body temperature of the electrolytic capacitor from rising to the first preset temperature, and be beneficial to improving the service life of the electrolytic capacitor and the whole machine. And the operation frequency of the compressor is reduced in a segmented manner, but is not continuously reduced, so that the refrigeration effect is favorably ensured. If the temperature drops, the running frequency of the compressor can be increased in a segmented mode to obtain better refrigerating effect.
In an embodiment of the present invention, as shown in fig. 7, the step S3 of controlling the operation frequency of the compressor at the rear end of the electrolytic capacitor in a stepwise manner according to the temperature interval where the bulk temperature of the electrolytic capacitor is located may include S31-S34, which are as follows:
s31: and when the body temperature of the electrolytic capacitor is less than or equal to the second preset temperature T2, controlling the compressor at the rear end of the electrolytic capacitor to operate at a first set frequency F1. At this moment, the body temperature of the electrolytic capacitor is low, the value of the first preset frequency F1 can be large, the body temperature of the electrolytic capacitor cannot exceed a safety threshold, and the refrigeration effect of the household appliance can be guaranteed.
S32: and when the temperature of the body of the electrolytic capacitor is higher than the second preset temperature T2 and lower than or equal to the third preset temperature T3, controlling the compressor at the rear end of the electrolytic capacitor to perform frequency reduction operation according to a first reduction rate K1. The compressor is controlled to operate in a frequency reduction mode to reduce the operating current of the whole machine, so that the temperature of the electrolytic capacitor body is reduced to maintain the temperature within a safe temperature range.
S33: and when the body temperature of the electrolytic capacitor is higher than the third preset temperature T3 and lower than or equal to the fourth preset temperature T4, controlling the compressor at the rear end of the electrolytic capacitor to operate at a second preset frequency F2, wherein the first preset frequency F1 is higher than the second preset frequency F2. At this time, the temperature of the body of the electrolytic capacitor rises but still does not exceed the safety threshold, so the compressor is operated at the second preset frequency F2, which is relatively small, so as to ensure the working safety of the electrolytic capacitor and the refrigeration effect of the household appliance.
S34: and when the temperature of the body of the electrolytic capacitor is higher than the fourth preset temperature T4 and lower than or equal to the first preset temperature T1, controlling the compressor at the rear end of the electrolytic capacitor to perform frequency reduction operation according to a second reduction rate K2. At the moment, the body temperature of the electrolytic capacitor is higher and is close to the safety threshold, so that the compressor is controlled to perform frequency reduction operation to reduce the running current of the whole machine, and the body temperature of the electrolytic capacitor is reduced to avoid exceeding the first preset temperature T1.
Therefore, the operation frequency of the compressor is controlled in a segmented mode according to the temperature interval where the body temperature of the electrolytic capacitor is located, the body temperature of the electrolytic capacitor is effectively prevented from being too high, a good overheating protection effect is achieved, and the normal work and refrigeration effect of household appliances are guaranteed.
According to some embodiments of the invention, when the body temperature of the electrolytic capacitor is higher than the first preset temperature, the compressor at the rear end of the electrolytic capacitor can be controlled to stop, and the risk of explosion and fire of the electrolytic capacitor can be prevented through stop protection, so that the use is safer.
According to the overheat protection control method for the electrolytic capacitor in the household appliance, when the body temperature of the electrolytic capacitor is less than or equal to the first preset temperature, the operation frequency of the compressor at the rear end of the electrolytic capacitor is controlled in a segmented mode according to the temperature interval of the electrolytic capacitor, the body temperature of the electrolytic capacitor is effectively prevented from being overhigh, a good overheat protection effect is achieved, the service life of devices such as the electrolytic capacitor is prolonged, the maintenance frequency and the maintenance cost of the household appliance are reduced, and the normal work and refrigeration effects of the household appliance are guaranteed.
According to the computer readable storage medium of the embodiment of the invention, the overheat protection control program of the electrolytic capacitor in the household appliance is stored on the computer readable storage medium, and when being executed by the processor, the overheat protection control program of the electrolytic capacitor in the household appliance realizes the overheat protection control method of the electrolytic capacitor in the household appliance.
According to the computer-readable storage medium of the embodiment of the invention, the stored overheat protection control program is executed by the processor to realize the overheat protection control method described in the embodiment, when the body temperature of the electrolytic capacitor is less than or equal to the first preset temperature, the operation frequency of the compressor at the rear end of the electrolytic capacitor is controlled in a segmented manner according to the temperature interval of the electrolytic capacitor, so that the body temperature of the electrolytic capacitor is effectively prevented from being too high, a good overheat protection effect is achieved, the service life of devices such as the electrolytic capacitor is prolonged, the maintenance frequency and the maintenance cost of the household appliance are reduced, and the normal work and the refrigeration effect of the household appliance are ensured.
The motor controller comprises a memory, a processor and an overheating protection control program of an electrolytic capacitor in household electrical appliance, wherein the overheating protection control program is stored in the memory and can be operated on the processor.
According to the motor controller provided by the embodiment of the invention, when the body temperature of the electrolytic capacitor is less than or equal to the first preset temperature, the operation frequency of the compressor at the rear end of the electrolytic capacitor is controlled in a segmented manner according to the temperature interval of the electrolytic capacitor, so that the body temperature of the electrolytic capacitor is effectively prevented from being overhigh, a good overheating protection effect is achieved, the service life of devices such as the electrolytic capacitor is prolonged, the maintenance frequency and the maintenance cost of household appliances are reduced, and the normal work and the refrigeration effect of the household appliances are ensured.
As shown in fig. 8, an overheat protection control apparatus 10 for an electrolytic capacitor 100 in a household electrical appliance according to an embodiment of the present invention includes: the device comprises a temperature acquisition module 11, a determination module 12 and an overheating protection control module 13. The temperature obtaining module 11 is configured to obtain a body temperature of the electrolytic capacitor 100. The determining module 12 is configured to determine a temperature interval in which the body temperature of the electrolytic capacitor 100 is located when the body temperature of the electrolytic capacitor 100 is less than or equal to a first preset temperature. The overheating protection control module 13 is configured to perform segmented control on the operation frequency of the compressor at the rear end of the electrolytic capacitor 100 according to a temperature interval in which the body temperature of the electrolytic capacitor 100 is located.
The method for acquiring the body temperature of the electrolytic capacitor 100 by the temperature acquisition module 11 and the method for controlling the operation frequency of the compressor at the rear end of the electrolytic capacitor 100 by the overheat protection control module 13 refer to the overheat protection control method for the electrolytic capacitor in the household electrical appliance according to the embodiment of the present invention, and the entire contents of the overheat protection control method for the electrolytic capacitor in the household electrical appliance according to the embodiment of the present invention can be used for the overheat protection control device 10 for the electrolytic capacitor 100 in the household electrical appliance according to the embodiment of the present invention, and the specific contents and beneficial effects thereof are not described herein again.
According to the overheat protection control device 10 of the electrolytic capacitor 100 in the household appliance, when the body temperature of the electrolytic capacitor 100 is less than or equal to the first preset temperature, the operation frequency of the compressor at the rear end of the electrolytic capacitor 100 is controlled in a segmented manner according to the temperature interval of the electrolytic capacitor 100, so that the body temperature of the electrolytic capacitor 100 is effectively prevented from being too high, a good overheat protection effect is achieved, the service life of devices such as the electrolytic capacitor 100 is prolonged, the maintenance frequency and the maintenance cost of the household appliance are reduced, and the normal work and the refrigeration effect of the household appliance are ensured.
An overheat protection control circuit 20 of an electrolytic capacitor 100 in a home appliance according to an embodiment of the present invention is described below with reference to the drawings.
As shown in fig. 4, the overheat protection control circuit 20 of the electrolytic capacitor 100 in the household electrical appliance according to the embodiment of the present invention includes: a temperature detection unit 30 and a control unit 40.
Specifically, the temperature detection module is used for detecting the body temperature of the electrolytic capacitor 100. The control unit 40 is connected to the temperature detecting unit 30, and the control unit 40 is configured to determine the body temperature of the electrolytic capacitor 100, determine a temperature interval in which the body temperature of the electrolytic capacitor 100 is located when the body temperature of the electrolytic capacitor 100 is less than or equal to a first preset temperature T1, and perform segmented control on the operating frequency of the compressor at the rear end of the electrolytic capacitor 100 according to the temperature interval in which the body temperature of the electrolytic capacitor 100 is located.
When the body temperature of the electrolytic capacitor 100 is less than or equal to the first preset temperature T1, it indicates that the body temperature of the electrolytic capacitor 100 does not reach a safety threshold at which risks such as explosion, fire, etc. may occur, and the household electrical appliance may operate normally. When the household electrical appliance normally works, the body temperature of the electrolytic capacitor 100 is related to the whole machine current due to the existence of the ripple current of the electrolytic capacitor 100, and the temperature rises when the whole machine current is larger, and the temperature drops when the whole machine current is smaller.
Therefore, when the temperature of the electrolytic capacitor 100 is less than or equal to the first preset temperature T1, if the temperature rises, the operating frequency of the compressor can be reduced by stages, so as to reduce the current of the whole machine, reduce the temperature of the electrolytic capacitor 100, avoid the temperature of the electrolytic capacitor 100 from rising to the first preset temperature, and be beneficial to prolonging the service lives of the electrolytic capacitor 100 and the whole machine. And the operation frequency of the compressor is reduced in a segmented manner, but is not continuously reduced, so that the refrigeration effect is favorably ensured. If the temperature drops, the running frequency of the compressor can be increased in a segmented mode to obtain better refrigerating effect.
In an embodiment of the present invention, as shown in fig. 7, the control unit 40 is further configured to control the compressor at the rear end of the electrolytic capacitor 100 to operate at a first set frequency F1 when the temperature of the body of the electrolytic capacitor 100 is less than or equal to a second preset temperature T2. At this time, the body temperature of the electrolytic capacitor 100 is low, and the value of the first preset frequency F1 can be large, so that the body temperature of the electrolytic capacitor 100 does not exceed a safety threshold, and the refrigeration effect of the household appliance can be ensured.
As shown in fig. 7, the control unit 40 is further configured to control the compressor at the rear end of the electrolytic capacitor 100 to perform a down-conversion operation according to a first falling rate K1 when the temperature of the electrolytic capacitor 100 is greater than the second preset temperature T2 and less than or equal to a third preset temperature T3. The compressor is controlled to operate in a frequency reduction mode to reduce the operation current of the whole machine, so that the temperature of the body of the electrolytic capacitor 100 is reduced to be maintained within a safe temperature range.
As shown in fig. 7, the control unit 40 is further configured to control the compressor at the rear end of the electrolytic capacitor 100 to operate at a second preset frequency F2 when the body temperature of the electrolytic capacitor 100 is greater than the third preset temperature T3 and less than or equal to a fourth preset temperature T4, wherein the first preset frequency F1 is greater than the second preset frequency F2. At this time, the temperature of the body of the electrolytic capacitor 100 rises but still does not exceed the safety threshold, so that the compressor is operated at the second preset frequency F2, which is relatively small, to ensure the safety of the electrolytic capacitor 100 and the refrigeration effect of the household electrical appliance.
As shown in fig. 7, the control unit 40 is further configured to control the compressor at the rear end of the electrolytic capacitor 100 to perform a down-conversion operation according to a second decreasing rate K2 when the temperature of the electrolytic capacitor 100 is greater than the fourth preset temperature T4 and less than or equal to the first preset temperature T1. At this time, the body temperature of the electrolytic capacitor 100 is higher and approaches the safety threshold, so that the compressor is controlled to perform the frequency reduction operation to reduce the operation current of the whole machine, thereby reducing the body temperature of the electrolytic capacitor 100 to prevent the body temperature of the electrolytic capacitor 100 from exceeding the first preset temperature T1.
Therefore, the operation frequency of the compressor is controlled in a segmented mode according to the temperature interval where the body temperature of the electrolytic capacitor 100 is located, the body temperature of the electrolytic capacitor 100 is effectively prevented from being too high, a good overheating protection effect is achieved, and the normal work and refrigeration effect of household appliances are guaranteed.
According to some embodiments of the present invention, the control unit 40 is further configured to control the compressor at the rear end of the electrolytic capacitor 100 to stop when the temperature of the body of the electrolytic capacitor 100 is greater than the first preset temperature T1, so as to prevent the risk of explosion and fire of the electrolytic capacitor 100 by the stop protection, and make the use safer.
In the embodiment of the present invention, the method of acquiring the bulk temperature of the electrolytic capacitor 100 may include various methods.
In some embodiments of the present invention, as shown in fig. 4, the temperature detection unit 30 includes: temperature sensor 31, first resistance 32, second resistance 33, first voltage-stabilizing capacitance 34 and first capacitance 35.
The temperature sensor 31 is disposed corresponding to the electrolytic capacitor 100, and one end of the temperature sensor 31 is connected to a preset power supply to detect the body temperature of the electrolytic capacitor 100. One end of the first resistor 32 is connected to the other end of the temperature sensor 31 and has a first node, and the other end of the first resistor 32 is connected to a temperature sampling terminal of the control unit 40. One end of the second resistor 33 is connected to the first node, and the other end of the second resistor 33 is grounded. The positive terminal of the first voltage-stabilizing capacitor 34 is connected to the first node, and the other terminal of the first voltage-stabilizing capacitor 34 is grounded. One end of the first capacitor 35 is connected to the other end of the first resistor 32, and the other end of the first capacitor 35 is grounded. The second resistor 33 can constitute a voltage divider circuit with the temperature sensor 31 to determine a voltage signal of a corresponding temperature. The first resistor 32 and the first capacitor 35 can perform a delay filtering function, and the first voltage stabilizing capacitor 34 performs a signal stabilizing function, so that a very clean electrical signal is obtained and input into the control unit 40, and the control unit 40 converts the electrical signal to operate, thereby achieving the purpose of detecting and controlling the temperature.
For example, in some embodiments, as shown in FIG. 5, the temperature sensor 31 is an NTC thermistor (negative temperature coefficient). NTC thermistors can be as small as 0.010 inches or a very small diameter, which is very convenient to install. Optionally, the NTC thermistor may be embedded in the body of the electrolytic capacitor 100 or disposed below the body of the electrolytic capacitor 100, for example, the NTC thermistor may be a chip-packaged thermistor, which can realize temperature detection, and is convenient to install, thereby avoiding interference of other devices. The resistance value of an NTC thermistor rapidly decreases with increasing temperature, and it may be composed of two or three metal oxides, mixed in a fluid-like clay, and calcined in a high temperature furnace to form a dense sintered ceramic.
For example, as shown in fig. 4 and 5, the NTC thermistor, which has a characteristic that the resistance value rapidly decreases with the increase of temperature at a certain measurement power, is used to form a voltage dividing circuit with the second resistor 33 by the change of the resistance value, so as to determine the voltage signal of the corresponding temperature. The voltage signal is stabilized by the first voltage stabilizing capacitor 34, and is subjected to delay filtering by the first resistor 32 and the first capacitor 35, so that a very clean electric signal is obtained and is input into the control unit 40. The control unit 40 performs a conversion operation on the electrical signal to achieve the purpose of detecting and controlling the temperature.
For another example, in some embodiments, as shown in fig. 4 and 6, the temperature sensor 31 is a thermocouple. The thermocouple can directly measure the temperature of the electrolytic circuit, obtain the temperature of the body of the electrolytic capacitor 100 to be measured, and convert the temperature signal into a thermal voltage signal. The voltage signal is stabilized by the first voltage stabilizing capacitor 34, and is subjected to delay filtering by the first resistor 32 and the first capacitor 35, so that a very clean electric signal is obtained and is input into the control unit 40(MCU processor). The control unit 40 performs a conversion operation on the electrical signal to achieve the purpose of detecting and controlling the temperature. Optionally, the thermocouple may be disposed inside the body of the electrolytic capacitor 100 or be a patch packaged thermocouple and disposed on the surface of the body of the electrolytic capacitor 100, which may achieve temperature detection, and is convenient to install and avoids interference of other devices.
In some embodiments of the present invention, the temperature of the bulk of the electrolytic capacitor 100 may be detected based on the voltage change of the electrolytic capacitor 100. As shown in fig. 2 and 3, the voltage across the electrolytic capacitor 100 varies periodically with time, and the body temperature of the electrolytic capacitor 100 can be obtained according to the maximum voltage value (denoted as Umax) and the minimum voltage value (denoted as Umin) across the electrolytic capacitor 100.
Specifically, the temperature detection unit 30 includes a voltage detection unit connected to the control unit 40, and the voltage detection unit is configured to detect the voltage across the electrolytic capacitor 100, wherein the control unit 40 is further configured to calculate a voltage difference (denoted as Δ U, Δ U ═ Umax-Umin) between a maximum voltage value and a minimum voltage value across the electrolytic capacitor 100 within one cycle time according to the voltage across the electrolytic capacitor 100, and calculate the body temperature of the electrolytic capacitor 100 according to the voltage difference.
In some embodiments, control unit 40 calculates the bulk temperature of electrolytic capacitor 100 according to the following equation:
ΔU＝k*T+A
wherein Δ U is a voltage difference, k is a predetermined coefficient, T is a body temperature of the electrolytic capacitor 100, and a is a predetermined compensation value.
According to the formula, after the maximum voltage value and the minimum voltage value of the two ends of the electrolytic capacitor 100 are determined, the body temperature of the electrolytic capacitor 100 can be uniquely determined, and the temperature detection is simpler and more accurate. The change of the operating frequency of the whole machine is feedback-controlled through the change of the solved T value, so that the change of the ripple wave of the electrolytic capacitor 100 is controlled in a reliable range, the temperature of the electrolytic capacitor 100 is controlled in a safe operating range, and the electrolytic capacitor 100 is prevented from overheating and losing efficacy.
According to the overheat protection control circuit 20 of the electrolytic capacitor 100 in the household appliance, when the body temperature of the electrolytic capacitor 100 is less than or equal to the first preset temperature through the control unit 40, the operation frequency of the compressor at the rear end of the electrolytic capacitor 100 is controlled in a segmented manner according to the temperature interval of the electrolytic capacitor 100, so that the body temperature of the electrolytic capacitor 100 is effectively prevented from being too high, a good overheat protection effect is achieved, the service life of devices such as the electrolytic capacitor 100 is prolonged, the maintenance frequency and the maintenance cost of the household appliance are reduced, and the normal work and the refrigeration effect of the household appliance are ensured.
The household appliance according to the embodiment of the present invention includes the overheat protection control circuit 20 of the electrolytic capacitor 100 in the household appliance according to the embodiment of the present invention. Since the overheat protection control circuit 20 of the electrolytic capacitor 100 in the household appliance according to the embodiment of the present invention has the above beneficial technical effects, according to the household appliance according to the embodiment of the present invention, when the body temperature of the electrolytic capacitor 100 is less than or equal to the first preset temperature, the control unit 40 controls the operation frequency of the compressor at the rear end of the electrolytic capacitor 100 in a segmented manner according to the temperature interval where the electrolytic capacitor 100 is located, so as to effectively avoid the over-high body temperature of the electrolytic capacitor 100, achieve a good overheat protection effect, facilitate the improvement of the service life of the electrolytic capacitor 100 and other devices, reduce the maintenance frequency and the maintenance cost of the household appliance, and ensure the normal operation and refrigeration effect of the household appliance.
Other configurations and operations of home appliances according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (19)
1. An overheating protection control method for an electrolytic capacitor in a household appliance is characterized by comprising the following steps:
obtaining the body temperature of the electrolytic capacitor;
when the body temperature of the electrolytic capacitor is less than or equal to a first preset temperature, determining a temperature interval in which the body temperature of the electrolytic capacitor is located;
and controlling the running frequency of the compressor at the rear end of the electrolytic capacitor in a segmented manner according to the temperature interval of the body temperature of the electrolytic capacitor.
2. The method for controlling the overheat protection of the electrolytic capacitor in the household electrical appliance according to claim 1, wherein the step of controlling the operation frequency of the compressor at the rear end of the electrolytic capacitor in a segmented manner according to the temperature interval in which the body temperature of the electrolytic capacitor is located comprises:
when the temperature of the body of the electrolytic capacitor is less than or equal to a second preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to operate at a first set frequency;
when the temperature of the body of the electrolytic capacitor is higher than a second preset temperature and lower than or equal to a third preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to perform frequency reduction operation according to a first reduction rate;
when the body temperature of the electrolytic capacitor is higher than a third preset temperature and lower than or equal to a fourth preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to operate at a second preset frequency, wherein the first preset frequency is higher than the second preset frequency;
and when the temperature of the body of the electrolytic capacitor is higher than a fourth preset temperature and lower than or equal to a first preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to perform frequency reduction operation according to a second reduction rate.
3. The method for controlling the overheat protection of the electrolytic capacitor in the household electrical appliance according to claim 1 or 2, wherein when the body temperature of the electrolytic capacitor is higher than a first preset temperature, the compressor at the rear end of the electrolytic capacitor is also controlled to stop.
4. The method for controlling the overheating protection of the electrolytic capacitor in the household electrical appliance according to claim 1 or 2, wherein the obtaining of the body temperature of the electrolytic capacitor comprises:
acquiring a maximum voltage value and a minimum voltage value at two ends of the electrolytic capacitor within a period of time, and calculating a voltage difference value at two ends of the electrolytic capacitor according to the maximum voltage value and the minimum voltage value;
and calculating the body temperature of the electrolytic capacitor according to the voltage difference.
5. The method of claim 4, wherein the body temperature of the electrolytic capacitor is calculated according to the following formula:
and Δ U ═ k × T + a, where Δ U is the voltage difference, k is a preset coefficient, T is the bulk temperature of the electrolytic capacitor, and a is a preset compensation value.
6. The method as claimed in claim 1 or 2, wherein the electrolytic capacitor is subjected to temperature detection by a temperature sensor to obtain the bulk temperature of the electrolytic capacitor.
7. The method as claimed in claim 6, wherein the temperature sensor is an NTC thermistor or thermocouple.
8. A computer-readable storage medium, having stored thereon an overheat protection control program for an electrolytic capacitor in a home appliance, which when executed by a processor, implements a protection control method for a dc fan according to any one of claims 1 to 7.
9. A motor controller, comprising a memory, a processor and an overheat protection control program for an electrolytic capacitor in a household electrical appliance stored in the memory and operable on the processor, wherein when the processor executes the overheat protection control program, the method for protecting and controlling a dc fan according to any one of claims 1 to 7 is implemented.
10. An overheat protection control device for an electrolytic capacitor in a home appliance, comprising:
the temperature acquisition module is used for acquiring the body temperature of the electrolytic capacitor;
the determining module is used for determining a temperature interval in which the body temperature of the electrolytic capacitor is located when the body temperature of the electrolytic capacitor is less than or equal to a first preset temperature;
and the overheating protection control module is used for controlling the operation frequency of the compressor at the rear end of the electrolytic capacitor in a segmented manner according to the temperature interval of the body temperature of the electrolytic capacitor.
11. An overheat protection control circuit for an electrolytic capacitor in a household appliance, comprising:
the temperature detection module is used for detecting the body temperature of the electrolytic capacitor;
the control unit is connected with the temperature detection unit and used for judging the body temperature of the electrolytic capacitor so as to determine the temperature interval of the body temperature of the electrolytic capacitor when the body temperature of the electrolytic capacitor is less than or equal to a first preset temperature and perform sectional control on the running frequency of the compressor at the rear end of the electrolytic capacitor according to the temperature interval of the body temperature of the electrolytic capacitor.
12. The overheat protection control circuit for an electrolytic capacitor in a household electrical appliance according to claim 11, wherein said control unit is further configured to,
when the temperature of the body of the electrolytic capacitor is less than or equal to a second preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to operate at a first set frequency;
when the temperature of the body of the electrolytic capacitor is higher than a second preset temperature and lower than or equal to a third preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to perform frequency reduction operation according to a first reduction rate;
when the body temperature of the electrolytic capacitor is higher than a third preset temperature and lower than or equal to a fourth preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to operate at a second preset frequency, wherein the first preset frequency is higher than the second preset frequency;
and when the temperature of the body of the electrolytic capacitor is higher than a fourth preset temperature and lower than or equal to a first preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to perform frequency reduction operation according to a second reduction rate.
13. The overheat protection control circuit for an electrolytic capacitor in a household electrical appliance according to claim 11 or 12, wherein the control unit is further configured to control a compressor at the rear end of the electrolytic capacitor to stop when the temperature of the body of the electrolytic capacitor is higher than a first preset temperature.
14. The overheat protection control circuit for an electrolytic capacitor in a home appliance according to claim 11 or 12, wherein the temperature detection unit comprises a voltage detection unit, the voltage detection unit is connected to the control unit, and the voltage detection unit is configured to detect a voltage across the electrolytic capacitor, wherein the control unit is further configured to calculate a voltage difference between a maximum voltage value and a minimum voltage value across the electrolytic capacitor within a period time according to the voltage across the electrolytic capacitor, and calculate a body temperature of the electrolytic capacitor according to the voltage difference.
15. The overheat protection control circuit for an electrolytic capacitor in a home appliance according to claim 14, wherein said control unit calculates a body temperature of said electrolytic capacitor according to the following formula:
and Δ U ═ k × T + a, where Δ U is the voltage difference, k is a preset coefficient, T is the bulk temperature of the electrolytic capacitor, and a is a preset compensation value.
16. The overheat protection control circuit for an electrolytic capacitor in a home appliance according to claim 11 or 12, wherein the temperature detection unit comprises:
the temperature sensor is arranged corresponding to the electrolytic capacitor, and one end of the temperature sensor is connected with a preset power supply;
one end of the first resistor is connected with the other end of the temperature sensor and is provided with a first node, and the other end of the first resistor is connected with the temperature sampling end of the control unit;
one end of the second resistor is connected with the first node, and the other end of the second resistor is grounded;
the positive electrode end of the first voltage-stabilizing capacitor is connected with the first node, and the other end of the first voltage-stabilizing capacitor is grounded;
and one end of the first capacitor is connected with the other end of the first resistor, and the other end of the first capacitor is grounded.
17. The circuit of claim 16, wherein the temperature sensor is an NTC thermistor, and the NTC thermistor is disposed under the body of the electrolytic capacitor.
18. The overheat protection circuit for an electrolytic capacitor of a home appliance as claimed in claim 16, wherein said temperature sensor is a thermocouple, and said thermocouple is disposed inside a body of said electrolytic capacitor.
19. An electric household appliance comprising an overheat protection control circuit for an electrolytic capacitor of the electric household appliance according to any one of claims 11 to 18.
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