CN116565802B - PTC control method and device based on power tube protection - Google Patents
PTC control method and device based on power tube protection Download PDFInfo
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- CN116565802B CN116565802B CN202310843911.XA CN202310843911A CN116565802B CN 116565802 B CN116565802 B CN 116565802B CN 202310843911 A CN202310843911 A CN 202310843911A CN 116565802 B CN116565802 B CN 116565802B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/567—Circuits characterised by the use of more than one type of semiconductor device, e.g. BIMOS, composite devices such as IGBT
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0081—Power supply means, e.g. to the switch driver
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- Power Conversion In General (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a PTC control method and device based on power tube protection, the method comprises that if a connection signal of a PTC heater in a power running state is detected, a corresponding driver starting signal is sent to an IGBT driving module, so that the IGBT driving module starts the IGBT module according to the driver starting signal; and determining the total current value of all the PTC modules according to the current flowing through the current sensing module, judging whether the total current value is larger than a preset current threshold according to a preset PTC operation monitoring strategy, if so, generating an assembly IGBT control signal, and turning off the assembly IGBT according to the assembly IGBT control signal. According to the method, the IGBT of the assembly can be turned off in time when the IGBT module is in short circuit, so that current surge and continuous dry burning of the PTC module are avoided, and the operation safety of the PTC heater is ensured.
Description
Technical Field
The invention relates to the technical field of intelligent control, in particular to a PTC control method and device based on power tube protection.
Background
The phenomenon that the operation of the existing PTC heater controller is invalid always exists, the operation overtemperature invalidation of the PTC module arranged in the PTC heater controller device is one of the reasons for the biggest operation invalidation of the controller, when the control circuit of the PTC module is correspondingly provided with the IGBT module for operation control, the IGBT module has short circuit risks due to long-time work and other reasons, the problem that the control circuit current of the PTC module is overlarge and cannot be effectively regulated easily after the IGBT module is short-circuited is solved, and the control current needs to be turned off to ensure the operation safety of the modules such as transistors in the circuit. In the existing PTC heater controller architecture, a corresponding transistor is usually added to each PTC module for direct control and shutdown, if the current in the circuit is too large and cannot be controlled due to the short circuit of the IGBT module, the PTC module is easy to cause continuous operation and overheat failure, so that the circuit system in the PTC heater is broken down. Therefore, the control of the PTC module can be safely protected by adopting an IGBT module control mode, the control accuracy of the IGBT module has a great influence on the control efficiency of the PTC module, and the PTC heater and the PTC module thereof are required to be protected in a transistor control mode with more rigorous control process, higher accuracy and direct and high efficiency.
Disclosure of Invention
The embodiment of the invention provides a PTC control method based on power tube protection, which aims to solve the problem of failure of PTC heater control operation in the prior art method.
In a first aspect, the embodiment of the invention discloses a PTC control method based on power tube protection, which is applied to a control module in a PTC heater, wherein the input end of the control module is electrically connected with a current sensing module, the output end of the control module is electrically connected with the input end of an IGBT driving module, a plurality of PTC modules are further arranged in the PTC heater, the input end of each PTC module is electrically connected with the output end of an assembly IGBT, the input end of the assembly IGBT is externally connected with a power supply to input voltage, the output end of each PTC module is connected with the input end of a corresponding one of the IGBT modules, the output end of the IGBT module is electrically connected with the input end of the current sensing module, and the input end of each IGBT module is electrically connected with the output end of the IGBT driving module. Determining a total current value of all the PTC modules according to the current flowing through the current sensing module; judging whether the total current value is larger than a preset current threshold value according to a preset PTC operation monitoring strategy; and if the total current value is greater than the current threshold value, generating an assembly IGBT control signal so that the assembly IGBT closes the connecting passage according to the assembly IGBT control signal.
Further, a first voltage value from the first regulator and a second voltage value from the second regulator are obtained; judging whether the first voltage value and the second voltage value meet preset starting conditions or not; if the starting condition is met, the connection signal that the PTC heater is in the power-carrying running state is judged to be obtained, and a driver starting signal is generated.
Further, judging whether the first voltage value is larger than a preset voltage threshold value; if the first voltage value is larger than a preset voltage threshold value, the preset starting condition is not met; if the first voltage value is not greater than the preset voltage threshold value, judging whether the second voltage value is greater than the voltage threshold value; if the second voltage value is larger than the preset voltage threshold value, the preset starting condition is not met; if the second voltage value is not greater than the preset voltage threshold value, the preset starting condition is met.
Further, judging whether the current running temperature value of each PTC module is larger than a safe temperature value; if the current running temperature value of any PTC module is larger than the safe temperature value, sending out alarm information; and if the current running temperature value of each PTC module is not larger than the safety temperature value, executing the step of judging whether the total current value is larger than a preset current threshold value according to a preset PTC running monitoring strategy.
Further, obtaining a current-temperature fitting curve of the PTC modules by performing least square fitting based on the current highest temperature value and the sum current value in each PTC module; obtaining the current value of each PTC module according to the current-temperature fitting curve of the PTC module; adding and calculating according to the current value of each PTC module to obtain a detection current value; judging whether the detected current value is larger than the sum current value, if so, executing the step of generating an assembly IGBT control signal or executing the step of judging whether the sum current value is larger than a preset current threshold value according to a preset PTC operation monitoring strategy.
In a second aspect, an embodiment of the present invention discloses a PTC control apparatus based on power tube protection, which is configured on a PTC heater by applying the PTC control method based on power tube protection, where the apparatus includes a module driving unit configured to send a corresponding driver start signal to an IGBT driving module if a connection signal with a power operation state of the PTC heater is detected, so that the IGBT driving module starts the IGBT module according to the driver start signal; a current value determining unit for determining a total current value of the PTC module according to a current flowing through the current sensing module; the first judging unit is used for judging whether the total current value is larger than a preset current threshold value according to a preset PTC operation monitoring strategy; and the transistor control unit is used for generating an assembly IGBT control signal if the total current value is greater than the current threshold value so that the assembly IGBT closes the connecting passage according to the assembly IGBT control signal.
Further, the device also comprises a voltage value acquisition unit for acquiring a first voltage value from the first regulator and a second voltage value from the second regulator; the starting condition judging unit is used for judging whether the first voltage value and the second voltage value meet the preset starting condition or not; and the starting signal generating unit is used for judging that the connection signal of the PTC heater in the power-carrying running state is acquired and generating a driver starting signal if the starting condition is met.
Further, the device further comprises a second judging unit, which is used for judging whether the first voltage value is larger than a preset voltage threshold value, if not, judging whether the second voltage value is larger than the preset voltage threshold value; and the third judging unit is used for judging that the first voltage value and the second voltage value meet the preset starting condition if the first voltage value and the second voltage value are lower than the voltage threshold.
According to the PTC control method based on the power tube protection and the power device heat dissipation device applying the method, the operation condition of the PCT module and the IGBT module is controlled by arranging the assembly IGBT capable of controlling the current to flow, the abnormal increase change information of the current caused by the short circuit is effectively obtained in the process of the short circuit of the IGBT module, the assembly IGBT is turned off in time, the time for adjusting the operation conditions such as the voltage, the current and the like in the PTC heater is obtained, the problem of overheat damage of the PTC module caused by the short circuit of the IGBT module is effectively prevented, the abnormal change information of the current is effectively obtained when the short circuit of the IGBT module occurs, the assembly IGBT is turned off in time, the current surge and the continuous dry burning risk of the PTC module are avoided, and the operation safety of the PTC heater and the PTC module is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a PTC control method based on power tube protection according to an embodiment of the present invention;
Fig. 2 is a logic block diagram of a PTC control method based on power tube protection according to an embodiment of the present invention;
Fig. 3 is a schematic structural diagram of a PTC control device based on power tube protection according to an embodiment of the present invention.
Reference numerals:
1. An assembly IGBT; 2. a PTC module; 3. an IGBT module; 4. a current sensing module; 5. an IGBT driving module; 6. a control module; 7. a transformer; 8. a first regulator; 9. a second regulator; 10. a signal converter.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
As shown in fig. 1 and fig. 2, in a first aspect, an embodiment of the present invention discloses a PTC control method based on power tube protection, wherein an input end of a control module 6 disposed in a PTC heater is electrically connected with a current sensing module 4, an output end of the control module 6 is electrically connected with an input end of an IGBT driving module 5, a plurality of PTC modules 2 are disposed in the PTC heater, an input end of each PTC module 2 is electrically connected with an output end of an assembly IGBT1, an input end of the assembly IGBT1 is externally connected with a power supply to input voltage, an output end of each PTC module 2 is connected with an input end of a corresponding one of IGBT modules 3, an output end of the IGBT module 3 is electrically connected with an input end of the current sensing module 4, and an input end of each IGBT module 3 is electrically connected with an output end of the IGBT driving module 5, the method includes steps S1 of sending a corresponding driver start signal to the IGBT driving module 5 if a connection signal with a power running state is detected in the PTC heater, so that the IGBT driving module 5 starts the IGBT module 3 according to the driver start signal; step S2, determining the total current value of all PTC modules 2 according to the current flowing through the current sensing module 4; step S3, judging whether the total current value is larger than a preset current threshold value according to a preset PTC operation monitoring strategy; and S4, if the sum current value is greater than a preset current threshold value, generating an assembly IGBT1 control signal so that the assembly IGBT1 closes a connecting passage according to the assembly IGBT1 control signal.
In a specific method implementation, the connection signal of the PTC heater is detected to determine whether it is in a powered operating state. This can be achieved by detecting a specific signal in the circuitry of the PTC heater, the type of signal comprising a type control signal such as a LIN signal. If the PTC heater is detected to be in the powered operating state, the system will send a corresponding driver start signal to the IGBT drive module 5. After the IGBT driving module 5 receives this signal, it will start the IGBT module 3 to prepare it to receive the current control instruction. The system can obtain the sum current value according to the current acquisition and the accurate induction of the current value by the current induction module 4. According to a preset PTC operation monitoring strategy, the system judges whether the calculated total current value is larger than a preset current threshold value. If the sum current value exceeds the threshold value, it indicates that the PTC heater is in an abnormal state. If the summed current value exceeds the preset threshold, the system will generate and send an assembly IGBT1 control signal to the assembly IGBT1. The assembly IGBT1 is turned off and the input current is stopped to protect the PTC module 2 from wear caused by long-time high-current operation. Based on a preset PTC operation monitoring strategy, the operation safety of the PTC heater is protected by detecting the sum current and controlling the assembly IGBT1.
In practical use, the PTC heater may be applied to a vehicle-mounted heating device of a new energy automobile, which is commonly used at present, the PTC heater generally uses the PTC module 2 to generate heat during operation, and in order to protect the PTC heater and its PTC module 2 and the safe operation of the transistor components, some measures need to be taken to perform circuit control, and the control is based on the current in the components and the operating temperature of the components. The PTC module 2 is usually installed in the circuit of PTC heater, the output of PTC module 2 connects an IGBT module 3, IGBT module 3 includes the IGBT wafer, be used for making the electric current pass through, PTC module 2 heats the effect under the effect of electric current, IGBT module 3 has certain short circuit risk under the effect of electric current, if IGBT module 3 takes place to short circuit, the electric current through PTC module 2 and IGBT module 3 will obviously increase, cause circuit loss risk, if electric current in the circuit keeps unusual, PTC module 2 operation heat production process will be difficult to control and cause great energy consumption, even cause certain running risk, need to shut down the transistor that PTC module 2 input set up and shut down the current path, make PTC module 2 stop operation in order to further carry out the operation adjustment, connect the output of assembly IGBT1 with the input of each PTC module 2, make each PTC module 2 realize parallelly connected back with assembly IGBT1, assembly IGBT1 is as the indirect control element of each IGBT module 2 electric current input, when IGBT module 3 takes place to short circuit and causes the electric current to increase, it stops once to make assembly IGBT1 through the control signal, make each IGBT module 3 operate and shut down and corresponding PTC module 2 have the total electric signal and shut down, can realize through the total mode of the PTC module 2 and the accuracy can be accomplished.
Further, a first voltage value from the first regulator 8 and a second voltage value from the second regulator 9 are acquired; judging whether the first voltage value and the second voltage value meet preset starting conditions or not; if the starting condition is met, the connection signal that the PTC heater is in the power-carrying running state is judged to be obtained, and a driver starting signal is generated.
Specifically, the first voltage value and the second voltage value are obtained by reading the output voltage values of the first regulator 8 and the second regulator 9. The acquisition and acquisition of the voltage values may be performed using suitable sensors or measurement circuitry. And comparing the acquired first voltage value and second voltage value with preset starting conditions. Depending on the specific requirements and design specifications, specific thresholds or conditions may be set to determine whether the start-up conditions are met. Then determining that a connection signal is acquired that the PTC heater is in a powered operating state and generating a driver start signal: if the first voltage value and the second voltage value satisfy a preset starting condition, indicating that the PTC heater is in a powered operation state, a corresponding connection signal may be generated according to the state, and a driver starting signal may be generated to start the PTC heater. The control module 6 in the PTC heater may be set as an MCU operation control chip having information storage and operation functions, and is used as a core for data storage, information generation and transceiving, voltage adjustment after current input is performed by setting a first voltage regulator and a second voltage regulator in the PTC heater, the input end of the first regulator 8 is led with a first starting current, the output end is connected with a signal converter, so that the signal converter obtains starting electric energy to perform operation, the second voltage regulator is connected with the control module 6, so that the control module 6 obtains starting electric energy, the first voltage regulator and the second voltage regulator adjust input voltages to safe usable ranges, and according to the first starting current value of the PTC heater, an appropriate voltage regulator is used to adjust the voltage value to a required first voltage value. The connection signal is generated by a logic judgment or conversion circuit for starting the control module 6. Using the second voltage value as input, a control module 6 start signal is generated by a logic judgment or conversion circuit so that the control module 6 sends a corresponding driver start signal to the IGBT driving module 5.
Further, judging whether the first voltage value is larger than a preset voltage threshold value; if the first voltage value is larger than a preset voltage threshold value, the preset starting condition is not met; if the first voltage value is not greater than the preset voltage threshold value, judging whether the second voltage value is greater than the voltage threshold value; if the second voltage value is larger than the preset voltage threshold value, the preset starting condition is not met; if the second voltage value is not greater than the preset voltage threshold value, the preset starting condition is met.
Specifically, it is necessary to determine whether the first voltage value matches a preset voltage threshold, generate a corresponding driver start signal, and acquire the voltage value of the first regulator 8 using an appropriate voltage sensor or monitoring device. The acquired voltage value of the first regulator 8 is compared with a preset voltage threshold. If the two are equal, this indicates that the start condition is reached. When the first voltage value is matched with a preset voltage threshold value, a driver starting signal is generated through a logic judging or converting circuit, whether the second voltage value is matched with the preset voltage threshold value is judged, a corresponding driver starting signal is generated, and a proper voltage sensor or a monitoring device is used for acquiring the voltage value of the second regulator 9. The acquired voltage value of the second regulator 9 is compared with a preset voltage threshold. If the two are equal, this indicates that the start condition is reached. When the second voltage value is matched with a preset voltage threshold value, a driver starting signal is generated through a logic judgment or conversion circuit. Judging whether the voltage value in the IGBT driving module 5 is equal to the starting voltage value, and generating a corresponding driver starting signal: the voltage value inside the IGBT drive module 5 is acquired using a suitable voltage sensor or monitoring device. The obtained voltage value of the IGBT driving module 5 is compared with a required starting voltage value. If the two are equal, this indicates that the start condition is reached. When the voltage value in the IGBT driving module 5 is equal to the starting voltage value, a driver starting signal is generated through a logic judgment or conversion circuit. The generated driver start signal is passed to the respective IGBT modules 3 to trigger their start actions.
Further, judging whether the current operation temperature value of each PTC module 2 is larger than a safe temperature value; if the current running temperature value of any PTC module 2 is larger than the safe temperature value, alarm information is sent out; if the current running temperature value of each PTC module 2 is not greater than the safe temperature value, executing the step of judging whether the total current value is greater than the preset current threshold value according to the preset PTC running monitoring strategy.
Specifically, the current operating temperature of each PTC module 2 is monitored and compared with a preset safe temperature value. If the current operating temperature value of any one of the PTC modules 2 exceeds the safe temperature value, an abnormal condition is indicated. If the current operating temperature value of any one PTC module 2 is found to be greater than the safe temperature value, immediate measures need to be taken. Operators or related responsible personnel may be alerted by sending an alarm message (e.g., an audible alarm or notification) so that they can take appropriate action. If the current operating temperature values of all PTC modules 2 are not greater than the safety temperature value, the following steps can be continued in this case according to a preset PTC operation monitoring strategy. For example, it may be determined whether the summed current value is greater than a preset current threshold to determine whether the system is operating properly and take further control action. And according to the PTC operation monitoring strategy, the temperature of each PTC module 2 is monitored and controlled, and a corresponding temperature sensor or monitoring device is used for acquiring the current operation temperature value of each PTC module 2. The obtained current operating temperature value of each PTC module 2 is compared with a preset safety temperature value. If the temperature value of any one PTC module 2 exceeds the safe temperature value, the total current value needs to be monitored, and if the condition that the temperature value exceeds the safe temperature value does not occur, an assembly IGBT1 control signal is generated and the assembly IGBT1 is started. The current highest temperature value is obtained from the PTC modules 2 that have exceeded the safe temperature value, and the total current value of all PTC modules 2 is obtained. Based on the current highest temperature value and the sum current value, a least square fitting algorithm is applied to establish a current-temperature fitting curve of the PTC module 2, the curve is used for estimating the relation between the temperature value at a specific moment and the current, the fitting relation exists between the temperature value at the specific moment of the PTC module 2 and the current value recorded at present, and the visual quantity relation between the current and the change of the temperature along with time can be provided in the accurate measurement process.
Further, obtaining a current-temperature fitting curve of the PTC modules 2 by performing least square fitting based on the current highest temperature value and the sum current value in each PTC module 2; obtaining the current value of each PTC module 2 according to the current-temperature fitting curve of the PTC module 2; adding and calculating according to the current value of each PTC module 2 to obtain a detection current value; judging whether the detected current value is larger than the sum current value, if so, executing the step of generating a control signal of the assembly IGBT1 or executing the step of judging whether the sum current value is larger than a preset current threshold value according to a preset PTC operation monitoring strategy.
Specifically, by monitoring each PTC module 2, the current operating temperature is obtained, and the highest temperature value in each PTC module 2 is recorded. Meanwhile, the sum current value is acquired, and a sensor or a measurement circuit may be used to measure and acquire these values. And fitting the current-temperature data of the PTC module 2 by using a least square fitting algorithm to obtain a curve. This fitting method can represent the relationship between current and temperature as a mathematical model and provide an approximation of a functional form. Based on the fitted curve, the corresponding current value is obtained by interpolation or calculation according to the current temperature value of each PTC module 2. In this way, real-time current information for each PTC module 2 can be obtained. The real-time current values of the respective PTC modules 2 are added to obtain a detection current value. This step is used to calculate the total current information for monitoring the operating state of the electric compressor device. And comparing the magnitude relation between the detected current value and the total current value. If the detected current value is greater than the sum current value, a corresponding operation is performed, such as generating an assembly IGBT1 (IGBT) control signal or making additional operation monitoring strategy decisions. The current of each PTC module 2 is calculated, and whether the assembly IGBT1 is closed or not is judged according to the detected current value: and calculating the current value of each PTC module 2 according to the fitting curve and the current temperature value of each PTC module 2. The present current value of each PTC module 2 is added and calculated to obtain a detection current value. This will be the sum of all PTC module 2 currents. And comparing the detected current value with a preset total current value. If the detected current value is not greater than the sum current value, it is not necessary to turn off the assembly IGBT1. According to the generated control signal of the assembly IGBT1, the control signal is applied to a control circuit of the assembly IGBT1 to turn off the assembly IGBT1.
In a second aspect, as shown in fig. 3, an embodiment of the present invention discloses a PTC control apparatus based on power tube protection, which is configured on a PTC heater by applying the PTC control method based on power tube protection, where the apparatus includes a module driving unit configured to send a corresponding driver start signal to an IGBT driving module if detecting that the PTC heater is a connection signal in a power operation state, so that the IGBT driving module starts the IGBT module according to the driver start signal; a current value determining unit for determining a sum current value of all the PTC modules according to the current flowing through the current sensing module; the first judging unit is used for judging whether the total current value is larger than a preset current threshold value according to a preset PTC operation monitoring strategy; and the transistor control unit is used for generating an assembly IGBT control signal if the total current value is greater than the current threshold value so that the assembly IGBT closes the connecting passage according to the assembly IGBT control signal.
Specifically, in an actual use scenario, the module driving unit is configured to send a corresponding driver start signal to the IGBT driving module after detecting that the PTC heater is in a connection signal with power running state. The signal will be received by the IGBT drive modules and used to start the respective IGBT modules. The current value determining unit is used for determining the total current value of all the PTC modules according to the current flowing through the current sensing module, and the total current value is used for detecting the current condition in the whole circuit. The first judging unit judges whether the calculated total current value is larger than a preset current threshold value or not based on a preset PTC operation monitoring strategy. If the total current value is greater than the current threshold value, the abnormal condition is indicated, and corresponding measures are needed. If the first judging unit judges that the total current value is larger than the current threshold value, the transistor control unit generates an assembly IGBT control signal. The signal is transmitted to the assembly IGBT, so that the assembly IGBT closes the connecting passage according to the signal, and the purpose of breaking the current is achieved.
Further, the device also comprises a voltage value acquisition unit for acquiring a first voltage value from the first regulator and a second voltage value from the second regulator; the starting condition judging unit is used for judging whether the first voltage value and the second voltage value meet the preset starting condition or not; and the starting signal generating unit is used for judging that the connection signal of the PTC heater in the power-carrying running state is acquired and generating a driver starting signal if the starting condition is met.
Specifically, the voltage value acquisition unit is configured to acquire a first voltage value from the first regulator and a second voltage value from the second regulator. The output voltage values of the first and second regulators are read by suitable sensors or measuring circuits to obtain first and second voltage values. The starting condition judging unit is used for judging whether the first voltage value and the second voltage value meet preset starting conditions. Depending on the specific requirements and design specifications, specific thresholds or conditions may be set, and the obtained voltage values are compared with these preset starting conditions. If the first voltage value and the second voltage value meet the preset starting conditions, the starting signal generating unit judges that the connection signal of the PTC heater in the power-carrying running state is acquired, and generates a corresponding driver starting signal. The signal will be transmitted to the IGBT drive modules to activate the respective IGBT modules.
Further, the device further comprises a second judging unit, which is used for judging whether the first voltage value is larger than a preset voltage threshold value, if not, judging whether the second voltage value is larger than the preset voltage threshold value; and the third judging unit is used for judging that the first voltage value and the second voltage value meet the preset starting condition if the first voltage value and the second voltage value are lower than the voltage threshold.
Specifically, if the first voltage value is greater than the voltage threshold, indicating that the voltage is normal, the start condition may be continuously determined; if the first voltage value is equal to or less than the voltage threshold, a determination of the second voltage value is required. The third judging unit is used for judging whether the first voltage value and the second voltage value are lower than a voltage threshold value. If the first voltage value and the second voltage value are lower than the voltage threshold value, the abnormal condition is indicated, but the starting condition may still be met; in this case, further judgment is required. The fourth judging unit is used for judging whether the first voltage value and the second voltage value meet preset starting conditions. Depending on the specific requirements and design specifications, specific thresholds or conditions may be set, and the first voltage value and the second voltage value may be compared with these preset starting conditions. The three judging units cooperate together to judge the first voltage value and the second voltage value, and generate a starting signal when the preset condition is met, so that the normal operation and protection of the PTC heater are ensured. In the design and implementation process, the functions and the relations of the judging units need to be fully considered, and proper voltage threshold values and starting conditions are set according to actual situations.
The invention discloses a PTC control method and device based on power tube protection, the method comprises the steps that S1, if a connection signal of a PTC heater in a power running state is detected, a corresponding driver starting signal is sent to an IGBT driving module 5, so that the IGBT driving module 5 starts an IGBT module 3 according to the driver starting signal; step S2, determining the total current value of all PTC modules 2 according to the current flowing through the current sensing module 4; step S3, judging whether the total current value is larger than a preset current threshold value according to a preset PTC operation monitoring strategy; and S4, if the sum current value is greater than a preset current threshold value, generating an assembly IGBT1 control signal so that the assembly IGBT1 closes a connecting passage according to the assembly IGBT1 control signal. The device comprises a module driving unit, a power supply unit and a power supply unit, wherein the module driving unit is used for sending a corresponding driver starting signal to the IGBT driving module if detecting that the PTC heater is in a connection signal with power running state, so that the IGBT driving module starts the IGBT module according to the driver starting signal; a current value determining unit for determining a sum current value of all the PTC modules according to the current flowing through the current sensing module; the first judging unit is used for judging whether the total current value is larger than a preset current threshold value according to a preset PTC operation monitoring strategy; and the transistor control unit is used for generating an assembly IGBT control signal if the total current value is greater than the current threshold value so that the assembly IGBT closes the connecting passage according to the assembly IGBT control signal. According to the PTC control method and device based on the power tube protection, the operation condition of the PCT module and the IGBT module 3 is controlled by arranging the assembly IGBT1 capable of controlling the current to flow, the change information of abnormal increase of the current caused by short circuit is effectively obtained in the process of short circuit of the IGBT module 3, the assembly IGBT1 is turned off timely, the time for adjusting the operation conditions such as the voltage and the current in the PTC heater is obtained, the problem that the PTC module 2 is damaged by continuous operation overheat caused by short circuit of the IGBT module 3 is effectively prevented, the integral operation stability and the safety of the PTC heater are ensured, the abnormal change information of the current is effectively obtained when the short circuit of the IGBT module 3 occurs, the assembly IGBT1 is turned off timely, the problem that the system cannot be normally and effectively turned off when the short circuit occurs in the circuit is solved, the continuous heat generation risk of the PTC module 2 is avoided, the PTC module 2 is prevented from being damaged by dry burning, and the operation safety of the PTC heater and the PTC module 2 is ensured.
The present invention is not limited to the above embodiments, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the present invention, and these modifications and substitutions are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (6)
1. The PTC control method based on the power tube protection is applied to a control module in a control PTC heater and is characterized in that the input end of the control module is electrically connected with a current sensing module, the output end of the control module is electrically connected with the input end of an IGBT driving module, a plurality of PTC modules are further arranged in the PTC heater, the input end of each PTC module is electrically connected with the output end of an assembly IGBT, the input end of the assembly IGBT is externally connected with a power supply to input voltage, the output end of each PTC module is connected with the input end of a corresponding IGBT module, the output end of the IGBT module is electrically connected with the input end of the current sensing module, and the input end of each IGBT module is electrically connected with the output end of the IGBT driving module, and the method comprises the following steps:
If the PTC heater is detected to be in a connection signal with power running state, a corresponding driver starting signal is sent to the IGBT driving module, so that the IGBT driving module starts the IGBT module according to the driver starting signal;
determining a total current value of all the PTC modules according to the current flowing through the current sensing module;
Judging whether the total current value is larger than a preset current threshold value according to a preset PTC operation monitoring strategy;
if the total current value is larger than the current threshold value, generating an assembly IGBT control signal so that the assembly IGBT closes a connecting passage according to the assembly IGBT control signal;
the method for detecting the PTC heater is characterized in that when the PTC heater is detected to be in a connection signal with power running state, a corresponding driver starting signal is sent to an IGBT driving module, so that the IGBT driving module starts the IGBT module according to the driver starting signal, and the method comprises the following steps:
Acquiring a first voltage value from a first regulator and a second voltage value from a second regulator, wherein one end of the first regulator is connected with a transformer, the other end of the first regulator is connected with one end of a signal converter, one end of the second regulator is connected with the transformer, the other end of the second regulator is connected with the control module, the first voltage value is a voltage value of two ends of the first regulator measured by the first regulator, the second voltage value is a voltage value of two ends of the second regulator measured by the second regulator, the input end of the IGBT module is also connected with the transformer, and the other end of the signal converter is connected with the control module;
Judging whether the first voltage value and the second voltage value meet a preset starting condition or not;
and if the starting condition is met, judging that the PTC heater is in a power-carrying running state, and generating the driver starting signal.
2. The PTC control method according to claim 1, wherein the determining whether the first voltage value and the second voltage value satisfy a preset starting condition comprises:
Judging whether the first voltage value is larger than a preset voltage threshold value or not;
If the first voltage value is larger than a preset voltage threshold value, a preset starting condition is not met;
if the first voltage value is not greater than a preset voltage threshold value, judging whether the second voltage value is greater than the voltage threshold value;
If the second voltage value is larger than a preset voltage threshold value, a preset starting condition is not met;
and if the second voltage value is not greater than the preset voltage threshold value, a preset starting condition is met.
3. The PTC control method according to claim 2, wherein after determining whether the summed current value is greater than a preset current threshold according to a preset PTC operation monitoring strategy, the method further comprises:
Judging whether the current running temperature value of each PTC module is larger than a safe temperature value;
If the current running temperature value of any PTC module is larger than the safe temperature value, sending out alarm information;
and if the current running temperature value of each PTC module is not larger than the safety temperature value, executing the step of judging whether the total current value is larger than a preset current threshold value according to a preset PTC running monitoring strategy.
4. A PTC control method according to claim 3 wherein before generating the assembly IGBT control signal or before determining whether the summed current value is greater than a preset current threshold according to a preset PTC operation monitoring strategy, the method further comprises:
obtaining a current-temperature fitting curve of the PTC modules by performing least square fitting based on the current highest temperature value and the sum current value in each PTC module;
Obtaining the current value of each PTC module according to the current-temperature fitting curve of the PTC module;
adding and calculating according to the current value of each PTC module to obtain a detection current value;
And judging whether the detected current value is larger than the sum current value, if so, executing the step of generating an assembly IGBT control signal or executing the step of judging whether the sum current value is larger than a preset current threshold according to a preset PTC operation monitoring strategy.
5. A PTC control apparatus based on power tube protection, disposed in a PTC heater, the control apparatus applying the PTC control method based on power tube protection according to any one of claims 1 to 4, characterized in that the control apparatus comprises:
The module driving unit is used for sending a corresponding driver starting signal to the IGBT driving module if the connection signal of the PTC heater in the power running state is detected, so that the IGBT driving module starts the IGBT module according to the driver starting signal;
a current value determining unit for determining a total current value of the PTC module according to a current flowing through the current sensing module;
The first judging unit is used for judging whether the total current value is larger than a preset current threshold value according to a preset PTC operation monitoring strategy;
The transistor control unit is used for generating an assembly IGBT control signal if the total current value is larger than the current threshold value, so that the assembly IGBT closes a connecting passage according to the assembly IGBT control signal;
the voltage value acquisition unit is used for acquiring a first voltage value from a first regulator and a second voltage value from a second regulator, one end of the first regulator is connected with a transformer, the other end of the first regulator is connected with one end of a signal converter, one end of the second regulator is connected with the transformer, the other end of the second regulator is connected with the control module, the first voltage value is a voltage value of two ends of the first regulator measured by the first regulator, the second voltage value is a voltage value of two ends of the second regulator measured by the second regulator, the input end of the IGBT module is also connected with the transformer, and the other end of the signal converter is connected with the control module;
the starting condition judging unit is used for judging whether the first voltage value and the second voltage value meet a preset starting condition or not;
and the starting signal generating unit is used for judging that the connection signal of the PTC heater in the power-carrying running state is acquired and generating the driver starting signal if the starting condition is met.
6. A PTC control device according to claim 5 wherein the PTC control device further comprises:
The second judging unit is used for judging whether the first voltage value is larger than a preset voltage threshold value or not, and if not, judging whether the second voltage value is larger than the preset voltage threshold value or not;
And the third judging unit is used for judging that the first voltage value and the second voltage value meet a preset starting condition if the first voltage value and the second voltage value are lower than the voltage threshold.
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