CN110957797A - Pre-charging completion judgment circuit and pre-charging completion judgment method of motor - Google Patents
Pre-charging completion judgment circuit and pre-charging completion judgment method of motor Download PDFInfo
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Abstract
The invention belongs to the technical field of electronics, and provides a pre-charging completion judgment circuit of a motor and a pre-charging completion judgment method of the motor; the precharge completion judging circuit includes: the first voltage division module is configured to divide the voltage of the motor bus and sample the voltage to output a first voltage; the second voltage division module is configured to divide the voltage of the battery bus and sample the voltage to output a second voltage; the voltage division ratio of the first voltage division module and the voltage division ratio of the second voltage division module meet a first preset condition; a comparator module configured to generate a charge comparison signal when the first voltage and the second voltage satisfy a second preset condition; a one-way digital isolation module configured to convert the charging comparison signal into a drive signal, the drive signal for disconnecting a pre-charge circuit of the motor; the pre-charging completion judging circuit can detect and judge the pre-charging process of the motor without software control, and solves the problems of complex circuit structure and higher manufacturing and application cost of the traditional judging circuit.
Description
Technical Field
The invention belongs to the technical field of electronics, and particularly relates to a pre-charge completion judgment circuit and a pre-charge completion judgment method for a motor.
Background
The motor is an electromagnetic device for realizing electric energy conversion or transmission by utilizing the law of electromagnetic induction, and has become an essential power component in the electronic field due to the excellent control performance and the capability of realizing various circuit functions; in the running process of the motor, technicians need to frequently adjust the on-off of the power supply to control the starting and stopping process of the power supply, and then a direct current bus of the motor needs to be connected with continuous electric energy to keep the stable running state of the motor; however, according to the internal structure of the motor controller in the conventional technology, a large capacitor exists on the dc bus of the motor, and if the motor is not suddenly changed according to the voltage of the two electrode plates of the capacitor at the moment of connecting the charging power supply, but the current at the two ends of the capacitor suddenly changes, the capacitor on the dc bus of the motor is equivalent to a short-circuit state at the moment, a short-circuit current with a very high amplitude exists on the dc bus, and the short-circuit current can seriously damage the physical safety of the capacitor, even the capacitor can be burnt by the serious short-circuit current, so that the operation safety of the motor is seriously damaged; therefore, technicians can suppress the impact of the short-circuit current on the capacitor at the moment of switching on the charging power supply through the pre-charging circuit of the motor, and after the direct current bus in the motor is stably connected into the charging power supply, the direct current bus of the motor is continuously connected into the charging power supply; therefore, the pre-charging circuit of the motor can prevent the damage of the capacitor caused by the impact current at the moment of switching on the charging power supply, ensure the safe and stable starting of the motor and further maintain the physical safety of the motor.
In the prior art, a pre-charging circuit provides pre-charging protection for a motor controller, and after the motor controller is charged through the pre-charging circuit, a direct current bus of the motor needs to be switched to supply power so as to realize safe starting and stable operation of the motor; therefore, when the motor is pre-charged and protected by the pre-charging circuit at the moment of starting up, the pre-charging process of the motor is immediately switched to the stable power supply mode of the motor bus after the pre-charging process of the motor is finished, so that the safe switching between the pre-charging mode and the stable power supply mode of the motor direct current bus is realized; then the technician needs to determine when the motor has completed precharging; in the conventional technology, the precharge judging circuit of the motor mainly adopts the following three technologies: 1. by collecting the current of a direct current bus in a motor controller, when the current of the direct current bus is close to a preset saturation value, judging that the motor is precharged; 2. respectively collecting the output voltage of the storage battery and the voltage of a direct current bus of the motor controller, and judging that the pre-charging of the motor is finished when the voltages of the storage battery and the motor controller are equal; 3. and collecting the voltage of a direct current bus of the motor controller, and judging that the motor pre-charging is finished when the voltage of the direct current bus of the motor controller reaches a preset under-voltage protection point.
However, in the above three methods for determining completion of pre-charging, the voltage of the motor controller or the voltage of the storage battery needs to be sampled and then a/D converted, and after the current/voltage signal needs to be processed by matching with corresponding software, it is finally determined whether the pre-charging of the motor is completed; therefore, the pre-charging completion judging circuit in the traditional technology not only needs an A/D conversion circuit but also needs to be matched with software for control, the operation is complicated, the manufacturing cost of the circuit structure is higher, and the judgment error of whether the pre-charging of the motor is completed is larger.
Disclosure of Invention
The invention provides a pre-charge completion judging circuit of a motor and a pre-charge completion judging method of the motor, and aims to solve the problems that in the prior art, the pre-charge completion judging circuit of the motor has a complex circuit structure, the pre-charge process of the motor can be detected and judged only by combining software control, the operation is complicated, a large error exists in judgment on whether the pre-charge of the motor is completed or not, and the operation cost is high.
A first aspect of the present invention provides a precharge completion determination circuit for a motor, including:
the first voltage division module is connected with the motor bus and is configured to divide the voltage of the motor bus, sample and output a first voltage;
the second voltage division module is connected with the battery bus and is configured to divide the voltage of the battery bus, sample and output a second voltage; the voltage division ratio of the first voltage division module and the voltage division ratio of the second voltage division module meet a first preset condition, wherein the first preset condition is as follows:
A/B≥C；
the A is the partial pressure ratio of the first partial pressure module, the B is the partial pressure ratio of the second partial pressure module, and the C is between 85% and 100%;
a comparator module connected to the first voltage dividing module and the second voltage dividing module and configured to generate a charging comparison signal when the first voltage and the second voltage satisfy a second preset condition;
and the single-path digital isolation module is connected with the comparator module and is configured to convert the charging comparison signal into a driving signal, wherein the driving signal is used for disconnecting a pre-charging circuit of the motor.
A second aspect of the present invention provides a method for determining completion of precharging a motor, including:
the method comprises the steps of carrying out voltage division sampling on voltage of a motor bus to output first voltage;
dividing and sampling the voltage of a battery bus to output a second voltage; wherein the partial pressure sampling ratio of the motor bus and the partial pressure sampling ratio of the battery bus meet a first preset condition, and the first preset condition is as follows:
W/V≥Q；
w is a divided voltage sampling ratio of the voltage of the motor bus, V is a divided voltage sampling ratio of the voltage of the battery bus, and Q is 85-100%;
generating a charging comparison signal when the first voltage and the second voltage meet a second preset condition;
and converting the charging comparison signal to obtain a driving signal, wherein the driving signal is used for disconnecting a pre-charging circuit of the motor.
In the pre-charging completion judgment circuit of the motor, the voltage of a motor bus and the voltage of a battery bus can be respectively acquired through a first voltage division module and a second voltage division module so as to obtain a first voltage and a second voltage; the change condition of the motor charging electric energy of the motor controller in the pre-charging process can be obtained through the first voltage and the second voltage; because the voltage division ratio of the first voltage division module and the voltage division ratio of the second voltage division module meet the first preset condition, the voltage of the motor bus and the voltage of the battery bus can be accurately and quickly judged according to the ratio of the voltage of the motor bus to the voltage of the battery bus: whether the motor completes the pre-charging process; when the first voltage and the second voltage meet a second preset condition and the voltage of the motor bus and the voltage of the battery bus meet a charging completion condition, the motor completes the pre-charging process, and the comparator module generates a charging comparison signal; the single-path digital isolation module generates a driving signal according to the charging comparison signal, and a pre-charging circuit of the motor is timely disconnected through the driving signal, so that the motor is automatically switched from a pre-charging mode to a stable power supply mode of the direct-current bus; therefore, the pre-charging completion judgment circuit in the embodiment can sample and convert the voltage of the bus of the motor and the voltage of the bus of the battery through the first voltage division module and the second voltage division module without A/D conversion; because the voltage division ratio of the first voltage division module and the voltage division ratio of the second voltage division module have a specific proportional relationship, the embodiment can directly judge whether the motor completes the pre-charging process according to the magnitude proportional relationship between the voltage of the motor bus and the voltage of the battery bus without software control, the pre-charging process of the motor can be detected, judged and a driving signal can be generated only by a hardware circuit structure, the operation is simple, the structure of the circuit is simple, the application cost of the pre-charging completion judgment circuit is low, the accurate judgment on whether the pre-charging of the motor is completed can be realized, and the operation is reliable; the problems that in the prior art, the judgment circuit for completing the pre-charging of the motor needs to perform A/D conversion on voltage/current, the pre-charging process of the motor can be detected and judged only by matching with software control, the manufacturing cost and the application cost of the circuit are high, the operation is complex, the judgment accuracy for completing the pre-charging of the motor is low and the practical value is not high are effectively solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a precharge circuit according to an embodiment of the present invention;
FIG. 2 is a block diagram of a precharge completion determination circuit according to an embodiment of the present invention;
fig. 3 is a circuit structure diagram of a first voltage division module and a second voltage division module according to an embodiment of the present invention;
fig. 4 is a circuit structure diagram of another first voltage division module and a second voltage division module according to an embodiment of the present invention;
fig. 5 is a circuit structure diagram of another first voltage division module and a second voltage division module according to an embodiment of the present invention;
fig. 6 is a block diagram of another precharge completion determination circuit according to an embodiment of the present invention;
fig. 7 is a circuit structure diagram of a power isolation module according to an embodiment of the present invention;
fig. 8 is a circuit structure diagram of a comparator module according to an embodiment of the present invention;
fig. 9 is a circuit structure diagram of a single-channel digital isolation module according to an embodiment of the present invention;
fig. 10 is a block diagram of a battery management system according to an embodiment of the present invention;
fig. 11 is a flowchart illustrating an implementation of a method for determining completion of pre-charging of a motor according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that, according to the internal circuit structure of the motor controller, at the moment when the motor controller is switched in a power supply and started, a large peak current exists on a motor bus, and since the peak current has a large amplitude and a short duration, if the peak current is not processed, the peak current will cause great damage to the operation of the motor controller, therefore, the traditional technology adopts a pre-charging circuit to realize pre-charging protection on the motor so as to alleviate physical damage to the motor caused by the peak current; in an exemplary manner, the first and second electrodes are,
fig. 1 shows a precharging circuit of a motor in the conventional technology, as shown in fig. 1, the precharging circuit of the motor has a resistor R0, and the resistor R0 is connected in parallel with a switch K0, when the motor is connected to a three-phase power supply, the three-phase power supply can be filtered through a filter, so as to improve the stability of the motor connected to the power supply, wherein the precharging circuit of the motor includes a resistor R0, at the moment that a bus of the motor is connected to the power supply, the switch K0 is turned off, the precharging circuit is turned on, and the power supply is output to the motor through a resistor R0, because the resistor R0 can consume the electric energy in the power supply, so as to reduce the damage of a peak current to the motor at the moment that the motor is connected to the power supply, the resistor R0 can weaken the; then, after the pre-charging process of the motor is completed, the switch K0 needs to be closed, the resistor R0 is short-circuited, the pre-charging circuit is disconnected, and then a three-phase power supply can be directly transmitted to the motor controller through the switch K0, so that stable power supply of the motor is realized, and the loss generated in the transmission process of electric energy is reduced; therefore, in the pre-charging process of the motor, whether the motor completes pre-charging needs to be judged in time, if the motor completes pre-charging, the motor controller needs to be rapidly switched to a stable power supply mode of a motor bus, and in the stable power supply mode, a three-phase power supply transmits electric energy to the motor through a switch K0 so as to drive the motor to be in a stable running state; the pre-charging completion judging circuit can directly judge whether the motor completes the pre-charging process, is simple and convenient to operate, and can ensure safe starting and stable operation of the motor.
It should be noted that the precharge circuit shown in fig. 1 is only an exemplary circuit structure, and since the precharge circuit is an application object of the precharge circuit in the present invention, the precharge completion determining circuit in the present invention can be applied to different motor precharge circuits in the field, and is not limited to the circuit structure of the precharge circuit shown in fig. 1.
Fig. 2 shows a block structure of a precharge completion determination circuit 10 of a motor according to an embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown, and detailed descriptions are as follows:
as shown in fig. 2, the precharge completion judgment circuit 10 includes: the voltage-dividing circuit comprises a first voltage-dividing module 101, a second voltage-dividing module 102, a comparator module 103 and a one-way digital isolation module 104, wherein the first voltage-dividing module 101 is connected with a motor bus 20, running electric energy of a motor exists in the motor bus 20, the voltage of the motor bus 20 can be divided and sampled by the first voltage-dividing module 101 to output a first voltage, the voltage of the motor bus 20 is the voltage inside the motor, the motor can keep a normal running state only when the voltage of the motor bus 20 is within an error range of a rated voltage of the motor bus 20, if the voltage of the motor bus 20 exceeds the error range of the rated voltage of the motor bus, the amplitude of an input power supply of the motor is overlarge, and the abnormal input power supply can cause great damage to the running safety of the motor; therefore, in this embodiment, the first voltage division module 101 performs voltage division sampling on the voltage of the motor bus 20 to obtain a first voltage, the actual input power condition of the motor can be obtained through the first voltage, and the first voltage division module 101 can monitor the actual input power change condition of the motor to ensure the operation safety of the motor.
The second voltage division module 102 is connected with the battery bus 30, wherein the battery bus 30 serves as a power supply function device, high-power electric energy can be provided for the motor through the battery bus 30, the battery bus voltage is acquired through the second voltage division module 102, the second voltage is output after voltage division sampling is carried out on the battery bus voltage, the size of the electric energy output by the battery bus 30 can be obtained through the second voltage, and then the change condition of the power output by the battery bus 30 can be monitored in real time through the second voltage division module 102; the voltage division ratio of the first voltage division module 101 and the voltage division ratio of the second voltage division module 102 satisfy a first preset condition, wherein the first preset condition is as follows:
A/B≥C (1)
in the above formula (1), a is the voltage dividing ratio of the first voltage dividing module 101, B is the voltage dividing ratio of the second voltage dividing module 102, and C is between 85% and 100%; as a preferred embodiment, C is 90%, so in this embodiment, the voltage dividing ratio in the first voltage dividing module 101 and the voltage dividing ratio in the second voltage dividing module 102 satisfy the condition of the above equation (1), and when the pre-charging process of the motor is completed, the voltage of the motor bus 20 sampled by the first voltage dividing module 101 and the voltage of the battery bus sampled by the second voltage dividing module 102 satisfy the charging completion condition; further, when the operating parameters of the first voltage dividing module 101 and the operating parameters of the second voltage dividing module 102 both satisfy the specific proportional relationship, the precharge completion determining circuit 10 in this embodiment may determine, according to the ratio of the voltage of the motor bus 20 to the voltage of the battery bus: whether the motor finishes the pre-charging operation or not is simple to operate, and the detection accuracy is extremely high.
In a preferred embodiment, when C is equal to 90%, and the voltage division ratio in the first voltage division module 101 reaches 90% of the voltage division ratio in the second voltage division module 102, the ratio between the voltage of the motor bus 20 and the voltage of the battery bus is as follows: whether the motor completes the pre-charging process or not is judged, and the detection and judgment precision of the pre-charging completion judgment circuit 10 on the motor pre-charging process is improved.
The comparator module 103 is connected with the first voltage division module 101 and the second voltage division module 102, the first voltage division module 101 transmits a first voltage to the comparator module 103, the second voltage division module 102 transmits a second voltage to the comparator module 103, wherein the comparator module 103 has a voltage analyzing and judging function, and when the first voltage and the second voltage satisfy a second preset condition, the motor has completed a pre-charging operation, the comparator module 103 generates a charging comparison signal; on the contrary, if the first voltage and the second voltage do not satisfy the second preset condition, the precharge completion determining circuit 10 cannot determine that: if the motor completes the pre-charging process, the comparator module 103 does not generate the charging comparison signal, so that there is a one-to-one correspondence between the presence of the charging comparison signal and the completion of the pre-charging process of the motor; specifically, if the first voltage obtained by sampling through the first voltage dividing module 101 and the second voltage through the second voltage dividing module 102 satisfy the second preset condition, the pre-charge completion determining circuit 10 can determine the pre-charge process of the motor, and in combination with the voltage dividing ratio relationship between the first voltage dividing module 101 and the second voltage dividing module 102 in the above formula (1), when the pre-charge process of the motor is completed, the voltage of the motor bus 20 is within the error range of the rated voltage of the motor bus 20, the voltage of the motor bus 20 and the voltage of the battery bus satisfy the charge completion condition, where the charge completion condition is:
O/P≥C (2)
in the above formula (2), O is the voltage of the motor bus 20, and P is the battery bus voltage; therefore, when the first voltage and the second voltage satisfy the second preset condition, the voltage of the battery bus 20 and the voltage of the battery bus satisfy the charging completion condition shown in the above equation (2), the comparator module 103 generates a charging comparison signal, and the precharge completion determination circuit 10 determines that: the motor has completed the precharge operation.
The single-path digital isolation module 104 is connected with the comparator module 103, when the comparator module 103 transmits the charging comparison signal to the single-path digital isolation module 104, the motor finishes the pre-charging process, the single-path digital isolation module 104 converts the charging comparison signal into a driving signal, and a pre-charging circuit of the motor is disconnected through the driving signal, so that the motor is directly connected with electric energy through a direct current bus to protect a stable working state, and the loss of the electric energy is avoided; the structure of the pre-charging circuit may refer to the circuit structure shown in fig. 1, where the single-path digital isolation module 104 has a function of signal function conversion, and the motor may be driven to adopt a working mode switching operation by the driving signal, so that the motor is converted from the pre-charging mode to a stable power supply mode, the motor is safely started, and the motor may be directly connected to the power supply in the stable power supply mode, thereby reducing the loss of electric energy, ensuring that the motor can be continuously connected to the stable electric energy in the stable power supply mode, and maintaining a stable and safe operation state.
In the pre-charge completion judging circuit 10 of the motor shown in fig. 2, the pre-charge completion judging circuit 10 includes 4 circuit modules (a first voltage division module 101, a second voltage division module 102, a comparator module 103, and a one-way digital isolation module 104), the pre-charge process of the motor can be detected and judged through the 4 circuit modules, the circuit structure is simple, and in the process of sampling and analyzing the voltage of the motor bus 20 and the voltage of the battery bus through the pre-charge completion judging circuit 10, the voltage does not need to be a/D converted, since the voltage division ratio of the first voltage division module 101 and the voltage division ratio of the second voltage division module 102 satisfy the condition in the above formula (1), whether the pre-charge process of the motor is completed or not can be directly judged through the magnitude relation between the voltage of the motor bus 20 and the voltage of the battery bus without software control, the internal circuit structure of each circuit module in the pre-charging completion judging circuit 10 can be used for accurately judging the pre-charging process of the motor, the operation is simple, the judgment error is small, the pre-charging completion judging circuit 10 has simplified manufacturing cost and application cost, and the practical value is high; when the pre-charging completion judgment circuit 10 detects that the motor has completed the pre-charging process, the single-path digital isolation module 104 generates a driving signal, the driving signal can drive the motor to realize the conversion of the working mode, the motor is automatically switched from the pre-charging mode to the stable power supply mode to ensure the safe starting and stable operation of the motor, avoid the physical damage to the motor caused by the peak current on the motor bus at the starting moment of the motor, and improve the safety of the motor; therefore, the problems that the circuit structure of the pre-charging completion judgment circuit in the traditional technology is complex, the manufacturing cost and the application cost are high, the operation process is complicated, and large errors exist in the detection and judgment of the pre-charging process of the motor are effectively solved.
As an optional implementation manner, the second preset condition is:
S＝T (3)
s is a first voltage, and T is a second voltage; in the comparator module 103, when the first voltage and the second voltage are equal, it can be known from the proportional relationship between the voltage of the motor bus 20 and the battery bus voltage that: whether the motor completes the pre-charging process or not is simple and convenient to operate, and the pre-charging completion judgment circuit 10 can accurately monitor and judge the pre-charging process of the motor.
As an alternative implementation, fig. 3 shows a specific circuit structure of the first voltage division module 101 and the second voltage division module 102 provided in this embodiment, as shown in fig. 3, the first voltage division module 101 includes a first voltage division branch 1011, where the first voltage division branch 1011 includes at least two resistors connected in series in sequence; each resistor has a function of resistor voltage division in the first voltage division branch 1011, and voltage division sampling is performed on the voltage of the motor bus 20 through a voltage division sampling resistor in the first voltage division branch 1011 to obtain a first voltage, so that voltage sampling and monitoring of the motor bus 20 are realized; the second voltage division module 102 comprises a second voltage division branch 1021, wherein the second voltage division branch 1021 comprises at least two resistors which are sequentially connected in series, and when the second voltage division branch 1021 is connected to the battery bus voltage, the battery bus voltage can be subjected to voltage division sampling through a voltage division sampling resistor in the second voltage division branch 1021 to obtain a second voltage, so that the sampling and monitoring of the battery bus voltage are realized.
As shown in fig. 3, a first end of the first voltage dividing branch 1011 is connected to the motor bus 20 for receiving the voltage of the motor bus 20; a first end of the second voltage division branch 1021 is connected with a battery bus 30 and is used for accessing the voltage of the battery bus; the second end of the first voltage division branch 1011 and the second end of the second voltage division branch 1021 are connected to the first end of a current limiting resistor RS in common, and the second end of the current limiting resistor RS is grounded GND; the current limiting resistor RS can play a role in preventing the current in the branch from being too large, and further, the current limiting resistor RS can prevent the operating current in the first voltage division branch 1011 and the operating current in the second voltage division branch 1021 from being in an overcurrent state in this embodiment, so that the operation safety of electronic components in the first voltage division branch 1011 and the second voltage division branch 1021 is ensured, and the first voltage division module 101 and the second voltage division module 102 can both realize a normal current sampling function; the first voltage dividing branch 1011 and the second voltage dividing branch 1021 satisfy the following conditions:
E＝D*C (4)；
in the above formula (4), E is a resistance value of the voltage division sampling resistor in the second voltage division branch 1021, and D is a resistance value of the voltage division sampling resistor in the first voltage division branch 1011; when the voltage-dividing sampling resistors in the second voltage-dividing module 102 and the voltage-dividing sampling resistors in the first voltage-dividing module 101 satisfy the condition shown in (4) above, in combination with the embodiment in fig. 2 above, if the first voltage output by the first voltage-dividing module 101 and the second voltage output by the second voltage-dividing module 102 satisfy a second preset condition, the comparator module 103 may determine that: the motor has completed the pre-charge process.
Therefore, the first voltage division module 101 and the second voltage division module 102 in this embodiment have very simplified circuits, and are easy to implement, and voltage division conversion can be respectively performed on the voltage of the motor bus 20 and the voltage of the battery bus by using a plurality of resistors connected in series, so as to implement accurate acquisition and monitoring of the input power supply of the motor and the output power supply of the battery, which is beneficial to reducing the judgment error of the pre-charging completion judgment circuit 10 in this embodiment to the pre-charging process of the motor, and ensuring the starting safety of the motor; meanwhile, in the embodiment, the number of the resistors in the first voltage division module 101 and the number of the resistors in the second voltage division module 102 can be adjusted at will according to actual needs, so that the compatibility is extremely high, the circuit structure of the precharge judgment circuit 10 in the embodiment is effectively simplified, the application range of the precharge judgment circuit 10 in the embodiment is greatly expanded, and the practical value is higher.
As a preferred embodiment, fig. 4 shows another specific circuit structure of the first voltage dividing module 101 and the second voltage dividing module 102 provided in this embodiment, as shown in fig. 4, the first voltage dividing branch 1011 includes N resistors, and the second voltage dividing branch 1021 includes N resistors, where N is a positive integer greater than or equal to 2; in the first voltage dividing branch 1011, a first end of the 1 st resistor R21 is a first end of the first voltage dividing branch 1011, wherein the first end of the first voltage dividing branch 1011 is used for accessing a voltage of the motor bus 20, a second end of the nth resistor R2N is a second end of the first voltage dividing branch 1011, a second end of the nth resistor R2N is connected to a first end of the current limiting resistor RS, a first end of the nth resistor R2N and a second end of the N-1 st resistor R2N-1 are connected in common to form a signal output end OUT1 of the first voltage dividing module 101, a signal output end OUT1 of the first voltage dividing module 101 is connected to the comparator module 103, and the nth resistor R2N is a voltage dividing sampling resistor of the first voltage dividing branch 1011; after the first voltage dividing branch 1011 divides the voltage of the motor bus 20 and samples the voltage, the first voltage can be output to the comparator module 103 through the signal output end OUT1 of the first voltage dividing module 101, and the comparator module 103 can obtain the voltage fluctuation condition in the motor bus 20 according to the first voltage.
In the second voltage-dividing branch 1021, a first end of the 1 st resistor R31 is a first end of the second voltage-dividing branch 1021, and a battery bus voltage can be accessed through the first end of the 1 st resistor R31; a second end of the nth resistor R3N is a second end of the second voltage dividing branch 1021, a second end of the nth resistor R3N is connected to a first end of the current limiting resistor RS, a first end of the nth resistor R3N and a second end of the N-1 st resistor R3N-1 are connected together to form a signal output end OUT2 of the second voltage dividing module 102, the nth resistor R3N is a voltage dividing sampling resistor of the second voltage dividing branch 1021, and a signal output end OUT2 of the second voltage dividing module 102 is connected to the comparator module 103; when the second branch 1021 divides and samples the voltage of the battery bus to obtain a second voltage, the signal output end OUT2 of the second voltage dividing module 102 outputs the second voltage to the comparator module 103, and the comparator module 103 can obtain the actual power supply fluctuation condition of the battery according to the second voltage.
The first voltage dividing branch 1011 and the second voltage dividing branch 1021 satisfy the following conditions:
F＝G*C (5)
H(i)＝K(i) (6)
in the above formula (5) and the above formula (6), F is the resistance of the nth resistor R3N in the second voltage dividing branch 1021, and G is the resistance of the nth resistor R2N in the first voltage dividing branch 1011; i is any positive integer from 1 to N-1, h (i) is the resistance of the ith resistor R3i in the second voltage-dividing branch 1021, and k (i) is the resistance of the ith resistor R2i in the first voltage-dividing branch 1011; when the first voltage dividing branch 1011 and the second voltage dividing branch 1021 satisfy the conditions of the equations (5) and (6), whether the motor completes the pre-charging process can be accurately detected according to the ratio of the voltage of the motor bus 20 to the voltage of the battery bus.
As a preferred embodiment, as shown in fig. 4, the first voltage dividing branch 1011 further includes: in an embodiment, the ESD diode RE1 and the capacitor RC1 are combined with the ESD diode RE1 and the nth resistor R2N in the first voltage dividing branch 1011, and the capacitor RC1 and the nth resistor R2N in the first voltage dividing branch 1011 are connected in parallel, where the ESD diode RE1 has functions of overvoltage protection and static protection, and in combination with the ESD diode RE1 and the capacitor RC1, the first voltage dividing branch 1011 can be prevented from being in an overcurrent state, and electronic components in the first voltage dividing branch 1011 are prevented from being interfered by electrostatic discharge in a circuit, so that stable and safe operation of the first voltage dividing branch 1011 is ensured; the second voltage division branch 1021 further includes: the ESD diode RE2 and the capacitor RC2, wherein the ESD diode RE2 is connected in parallel with the Nth resistor R3N in the second voltage-dividing branch 1021, the capacitor RC2 is connected in parallel with the Nth resistor R3N in the second voltage-dividing branch 1021, and the ESD diode RE2 and the capacitor RC2 are combined to play roles of preventing overvoltage and static electricity in the second voltage-dividing branch 1021 so as to prevent the second voltage-dividing branch 1021 from being in an overvoltage/overcurrent operation state, so that the battery bus voltage can be continuously sampled and monitored through the second voltage-dividing branch 1021; when the signal output end OUT2 of the second voltage division module 102 outputs the second voltage, the change condition of the battery output power supply can be obtained through the second voltage, so that the power supply safety of the motor is guaranteed.
To better explain the operation principle of the precharge completion determination circuit 10 in the present embodiment, the following describes the detection and determination principle of the precharge completion determination circuit 10 for the motor precharge process by using a specific embodiment, wherein in the present example, the first voltage-dividing branch 1011 includes 7 resistors connected in series in sequence, and the second voltage-dividing branch 1021 includes 7 resistors connected in series in sequence, wherein fig. 5 shows the specific circuit structure of the first voltage-dividing branch 1011 and the second voltage-dividing branch 1021 in the present example, and C is set to 90%, according to the above formula (1) and formula (2), if the precharge completion determination circuit 10 has satisfied the precharge completion determination condition, when the amplitude of the voltage of the motor bus 20 reaches 90% of the amplitude of the battery bus voltage, the comparator module 103 may determine: the motor has completed the pre-charge process; in order to simplify the analysis process of the circuit, the voltage division function of the current-limiting resistor RS is ignored in the example, in the circuit calculation process in the example, the resistance value of the current-limiting resistor RS is approximately 0 Ω, the first voltage division branch 1011 and the second voltage division branch 1021 are not in an overcurrent state, and the first voltage division branch 1011 and the second voltage division branch 1021 can respectively realize a normal voltage division conversion effect on the voltage; the method comprises the following specific steps:
as described above, the specific circuits according to the first and second voltage-dividing branches 1011 and 1021 shown in fig. 5; if in the first voltage-dividing branch 1011, the resistance of each of the 1 st to 6 th resistors is 127K Ω, and the resistance of the 7 th resistor R27 (voltage-dividing sampling resistor) is 5.6K Ω; in the second voltage-dividing branch 1012, the resistance of each of the 1 st to 6 th resistors is also 127K Ω, and the resistance of the 7 th resistor R37 (voltage-dividing sampling resistor) is: 5.6 × 90% ═ 5.04K Ω, so that: the resistance of the 7 th resistor R27 in the first voltage dividing branch 1011 is 10% greater than the resistance of the 7 th resistor R37 in the second voltage dividing branch 1021; if the battery bus voltage is sampled by the second voltage dividing branch 1012, the following results are obtained: the battery bus voltage V1 is 1000, and according to ohm's law, in the second voltage dividing branch 1012, the voltage divided by the 7 th resistor is: when V2 is (1000 × 5.04)/(127 × 6+5.04) is 6.57V, the second voltage is 6.57V after the battery bus voltage is divided and sampled by the second voltage dividing branch 1021; referring to the above-mentioned embodiment of fig. 2, if the pre-charge process of the motor is determined by equations (1) to (3), the first voltage and the second voltage must be equal, and then the first voltage V3 obtained after the voltage of the motor bus 20 is divided by the first voltage dividing branch 1011 must also be equal to 6.57V, and then the voltage V4 of the motor bus 20 is equal to 6.57/(5.6/(127 × 6+5.6)) -900.56V according to the series connection form of the 7 resistors in the first voltage dividing branch 1011, so that the voltage V4 sampled by the first voltage dividing branch 20 is 900.56V, and then the ratio of the voltage V4 of the motor bus 20 to the battery bus voltage V1 is: V4/V1-900.56/1000-90.056% > 90%; therefore, in this embodiment, the magnitudes of the voltage V4 of the motor bus 20 and the voltage V1 of the motor bus already satisfy the condition of the above equation (2), and then the motor is already precharged; the comparator module 103 generates a charging comparison signal, the motor can be indirectly driven to adopt a working mode switching operation through the charging comparison signal, the pre-charging circuit is disconnected, and the motor is automatically switched to a stable working mode from a pre-charging starting mode, so that the motor can safely and stably run, and the physical damage of the motor caused by spike current in the starting process of the motor is avoided.
As can be known from the above examples, the precharge completion determining circuit 10 in this embodiment can perform voltage division sampling on the voltage of the motor bus 20 and the voltage of the battery bus through the first voltage dividing module 101 and the second voltage dividing module 102, and since the resistance values between the voltage division sampling resistor of the first voltage dividing module 101 and the voltage division sampling resistor of the second voltage dividing module 102 satisfy a specific proportional relationship, it is determined whether the motor completes the precharge process according to the magnitude of the amplitude ratio between the voltage of the motor bus 20 and the voltage of the battery bus, and the operation is simple and convenient, the circuit structure is simple, and in the voltage sampling and converting process, software operation is not required, and a/D conversion is not required for the voltage; and then this embodiment relies on the circuit structure who finishes judging circuit 10 itself to precharge can carry out accurate monitoring and judgement to the precharge process of motor, and the precision of monitoring is high, has ensured the safe start-up and the steady operation of motor, has greatly reduced to precharge and has accomplished the manufacturing cost and the application cost that judge circuit 10, and the practicality is extremely strong.
As a specific implementation manner, fig. 6 is another block structure of the precharge completion judging circuit 10 provided in this embodiment, and compared with the block structure of the precharge completion judging circuit 10 shown in fig. 2, the precharge completion judging circuit 10 in fig. 6 further includes: the power supply system comprises a first power supply TES, a second power supply VAUX and a power isolation module 601, wherein the first power supply TES is connected with a comparator module 103 and a single-path digital isolation module 104, and electric energy can be transmitted to the comparator module 103 and the single-path digital isolation module 104 through the first power supply TES, so that the comparator module 103 and the single-path digital isolation module 104 can keep normal working states; the second power supply VAUX is connected to the single-channel digital isolation module 104, and outputs electric energy to the single-channel digital isolation module 104 through the second power supply VAUX; in this embodiment, both the first power supply TES and the second power supply VAUX can provide power to drive the electronic components in the pre-charge completion determination circuit 10 to be in a normal operating state; however, because the operating parameters of the first power supply TES and the operating parameters of the second power supply VAUX are different, and the electric energy output by the first power supply TES and the second power supply VAUX cannot be compatible, the first power supply TES and the second power supply VAUX cannot simultaneously supply power to the electronic components; the power isolation module 601 is connected between the first power supply TES and the second power supply VAUX, the power isolation module 601 has a power conversion function, therefore, the electric energy in the first power supply TES and the electric energy in the second power supply VAUX can be converted through the power isolation module 601, so that the first power supply TES and the second power supply VAUX can be compatible and coexist in the pre-charging completion judgment circuit, the safe power supply of each circuit module is ensured, and the accurate pre-charging judgment operation can be realized on the motor.
As an alternative implementation, fig. 7 is a circuit structure of the power isolation module 601 provided in this embodiment, and as shown in fig. 7, the power isolation module 601 includes: a dc converter P1, a first capacitor C1, a first inductor L1, a second capacitor C2, and a first diode D1; the first end of the first capacitor C1 and the positive power output terminal VOUT + of the dc converter P1 are commonly connected to the first power supply TES, the second end of the first capacitor C1 and the negative power output terminal VOUT + of the dc converter P1 are commonly connected to ground GND, the first end of the first inductor L1 is connected to the positive power input terminal VIN + of the dc converter P1, the second end of the first inductor L1, the first end of the second capacitor C2 and the cathode of the first diode D1 are commonly connected to the second power supply VAUX, and the anode of the first diode D1, the second end of the second capacitor C2 and the negative power input terminal VIN-of the dc converter P1 are commonly connected to ground GND.
As an alternative embodiment, the dc converter P1 has the following model: ROE 0505S; in this embodiment, the first power supply TES is connected to the second power supply VAUX through the dc converter P1, and the dc converter P1 can realize the conversion between the two power supplies; therefore, the first power supply TES and the second power supply VAUX can simultaneously provide stable electric energy to the electronic components in the precharge completion judging circuit 10, so as to ensure that the precharge completion judging circuit 10 can be in a normal working state.
As an alternative implementation, fig. 8 is a circuit structure of the comparator module 103 provided in this embodiment, and as shown in fig. 8, the comparator module 103 includes: a comparator chip U1 and a first resistor R1; a forward signal input pin IN + of the comparator chip U1 is connected with the second voltage division module 102, a reverse signal input pin IN-of the comparator chip U1 is connected with the first voltage division module 101, a ground pin of the comparator chip U1 is grounded GND, a power supply pin of the comparator chip U1 and a first end of the first resistor R1 are connected with a first power supply TES IN common, and stable electric energy can be provided for the comparator chip U1 through the first power supply TES; the second terminal of the first resistor R1 and the signal output terminal OUT of the comparator chip U1 are commonly connected to the single-channel digital isolation module 104.
As an alternative embodiment, the comparator chip U1 has model number TL 331; according to the circuit structure of the comparator module 103 shown IN fig. 8, when the first voltage dividing module 101 divides and samples the voltage of the motor bus 20 to obtain a first voltage, and the second voltage dividing module 102 divides and samples the voltage of the battery bus to obtain a second voltage, the comparator chip U1 is connected to the first voltage through the reverse signal input pin IN-, and the comparator chip U1 is connected to the second voltage through the forward signal input pin IN +; and the comparator chip U1 can derive from the first and second voltages: the variation of the power supply connected to the motor bus 20 and the power supply output from the battery bus 30; when the motor completes the pre-charging operation, the signal output end OUT of the comparator chip U1 outputs a charging comparison signal to the single-path digital isolation module 104 to drive the motor to realize the switching of the working modes; furthermore, the comparator chip U1 in this embodiment has a simplified circuit structure, and can accurately determine the motor pre-charging process.
As an alternative implementation, fig. 9 is a circuit structure of the single-channel digital isolation module 104 provided in this embodiment, and as shown in fig. 9, the single-channel digital isolation module 104 includes: a digital isolation chip U2, a third capacitor C3 and a fourth capacitor C4; a first end of the third capacitor C3 and a first power pin VS of the digital isolation chip U2 are commonly connected to the first power supply TES, a second end of the third capacitor C3 and a first ground pin VS of the digital isolation chip U2 are commonly connected to ground GND, a first end of the fourth capacitor C4 and a second power pin VDD1 of the digital isolation chip U2 are commonly connected to the second power supply VAUX, a second end of the fourth capacitor C4 and a second ground pin GND1 of the digital isolation chip U2 are commonly connected to ground GND, a signal input pin SDA2 of the digital isolation chip U2 is connected to the comparator module 103, a signal output pin SDA1 of the digital isolation chip U2 is a signal output end of the one-way digital isolation module 104, and a signal output end of the one-way digital isolation module 104 is used for outputting a driving signal; in this embodiment, the first power supply TES and the second power supply VAUX can output stable electrical energy to the digital isolation chip U2 at the same time, so that the digital isolation chip U2 can implement corresponding circuit functions.
As an optional implementation, the model number of the digital isolation chip U2 is: ADUM 1250; the digital isolation between the pre-charging completion judging circuit 10 and the motor can be realized through the digital isolation chip U2, so that the working safety of the pre-charging completion judging circuit 10 is guaranteed; if the precharge completion judging circuit 10 detects that the motor has completed the precharge process, the comparator module 103 outputs the charging comparison signal to the signal input pin SDA2 of the digital isolation chip U2, wherein the digital isolation chip U2 can perform the signal function conversion operation on the charging comparison signal, and the driving signal output through the signal output pin SDA1 of the digital isolation chip U2 can drive the motor to perform the operation mode switching operation, so that the motor enters the stable operation mode, and the motor is continuously connected with the stable power to maintain the normal operation.
As an alternative embodiment, the single-path digital isolation module 104 is a photocoupler; can change the comparison signal that charges through broadcasting and TV coupler, realize that precharge completion judges circuit 10 signal conversion and transmission function, judge circuit 10 and detect when precharge completion: after the motor is precharged, the photoelectric coupler can quickly output a driving signal to disconnect a precharging circuit of the motor so as to ensure the operation safety of the motor; therefore, the single-channel digital isolation module 104 in this embodiment has a very simplified circuit structure, which is beneficial to reducing the manufacturing cost and the application cost of the precharge completion determining circuit 10 in this embodiment.
Fig. 10 is a block configuration of a Battery Management System (BMS) 100 according to the present embodiment, and as shown in fig. 10, the Battery Management System 100 includes a pre-charge completion determination circuit 10 of the motor as described above; referring to the embodiments of fig. 1 to 9, the precharge completion determining circuit 10 in this embodiment has a simplified telephone structure, and can detect and determine the precharge process of the motor without software operation and a/D conversion of voltage, and is simple and convenient to operate and strong in practicability, and overcomes the disadvantage of complicated operation steps of the precharge completion determining method of the motor in the conventional technology; therefore, the battery management system 100 in this embodiment can monitor the pre-charging process of the motor in real time, and perform state estimation on the power supply of the battery, thereby ensuring safe start and stable operation of the motor; the battery management system 100 can prevent the damage of the spike current to the physical safety of the motor at the moment when the motor is connected with a power supply, thereby greatly maintaining the stable operation of the motor in the embodiment; meanwhile, the battery management system 100 has low application cost and high practical value, and can be applied to various industrial fields, thereby greatly improving the safety of the motor.
Fig. 11 is a flow of implementing the method for determining completion of precharging a motor provided in this embodiment, and as shown in fig. 11, the method for determining completion of precharging includes the following steps:
step S1101: the voltage of the motor bus is divided and sampled to output a first voltage.
Step S1102: dividing and sampling the voltage of a battery bus to output a second voltage; wherein the partial pressure sampling ratio of the motor bus and the partial pressure sampling ratio of the battery bus meet a first preset condition, and the first preset condition is as follows:
W/V≥Q (7)
in the above equation (7), W is a divided voltage sampling ratio of the voltage of the motor bus 20, V is a divided voltage sampling ratio of the battery bus voltage, and Q is between 85% and 100%.
Step S1103: generating a charging comparison signal when the first voltage and the second voltage meet a second preset condition;
step S1104: and converting the charging comparison signal into a driving signal, wherein the driving signal is used for disconnecting a pre-charging circuit of the motor.
It should be noted that the precharge completion determining method in the present embodiment corresponds to the precharge completion determining circuit 10 in fig. 2, and therefore, for the embodiments of the steps of the precharge completion determining method in the present embodiment, reference is made to the embodiment in fig. 2, and details will not be described here.
Therefore, in the embodiment, the pre-charging process of the motor can be detected and judged by the pre-charging completion judgment method, so that the damage of the peak current to the physical safety of the motor at the moment of switching on the power supply of the motor is avoided; after the motor finishes the pre-charging operation, the switching of the working mode of the motor can be automatically realized through the driving signal, and the motor is directly connected with the power supply in the stable working mode so as to keep the normal working state, thereby greatly improving the safety of the starting and the stable operation of the motor in the embodiment and ensuring the physical safety of the motor; the method overcomes the defects that the operation of the pre-charging completion judging method in the prior art is complex, and whether the pre-charging process of the motor is completed can be judged by combining software control, so that the application cost of the traditional pre-charging completion judging method is high.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or structure that comprises a list of elements is inherently related to the elements. Without further limitation, an element defined by the phrases "comprising … …" or "comprising … …" does not exclude the presence of additional elements in a process, method, article, or terminal that comprises the element. Further, herein, "greater than," "less than," "more than," and the like are understood to exclude the present numbers; the terms "above", "below", "within" and the like are to be understood as including the number.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A precharge completion judging circuit of a motor, comprising:
the first voltage division module is connected with the motor bus and is configured to divide the voltage of the motor bus, sample and output a first voltage;
the second voltage division module is connected with the battery bus and is configured to divide the voltage of the battery bus, sample and output a second voltage; the voltage division ratio of the first voltage division module and the voltage division ratio of the second voltage division module meet a first preset condition, wherein the first preset condition is as follows:
A/B≥C；
the A is the partial pressure ratio of the first partial pressure module, the B is the partial pressure ratio of the second partial pressure module, and the C is between 85% and 100%;
a comparator module connected to the first voltage dividing module and the second voltage dividing module and configured to generate a charging comparison signal when the first voltage and the second voltage satisfy a second preset condition;
and the single-path digital isolation module is connected with the comparator module and is configured to convert the charging comparison signal into a driving signal, wherein the driving signal is used for disconnecting a pre-charging circuit of the motor.
2. The precharge completion judgment circuit according to claim 1, wherein the second preset condition is:
S＝T；
s is the first voltage, and T is the second voltage.
3. The precharge completion judging circuit according to claim 1, wherein the first voltage dividing module comprises a first voltage dividing branch, wherein the first voltage dividing branch comprises at least two resistors connected in series in sequence; the second voltage division module comprises a second voltage division branch, wherein the second voltage division branch comprises at least two resistors which are sequentially connected in series;
the first end of the first voltage division branch is connected with the motor bus, the first end of the second voltage division branch is connected with the battery bus, the second end of the first voltage division branch and the second end of the second voltage division branch are connected with the first end of a current limiting resistor in common, and the second end of the current limiting resistor is grounded;
wherein the first voltage dividing branch and the second voltage dividing branch satisfy the following conditions:
E＝D*C；
and E is the resistance value of the voltage division sampling resistor in the second voltage division branch, and D is the resistance value of the voltage division sampling resistor in the first voltage division branch.
4. The precharge completion judging circuit according to claim 3, wherein the first voltage dividing branch comprises N resistors, and the second voltage dividing branch comprises N resistors, wherein N is a positive integer greater than or equal to 2;
in the first voltage division branch circuit, a first end of a1 st resistor is a first end of the first voltage division branch circuit, a second end of an Nth resistor is a second end of the first voltage division branch circuit, the first end of the Nth resistor and the second end of an N-1 th resistor are connected together to form a signal output end of the first voltage division module, and a signal output end of the first voltage division module is connected with the comparator module;
in the second voltage division branch circuit, a first end of a1 st resistor is a first end of the second voltage division branch circuit, a second end of an Nth resistor is a second end of the second voltage division branch circuit, the first end of the Nth resistor and the second end of an N-1 th resistor are connected together to form a signal output end of the second voltage division module, and a signal output end of the second voltage division module is connected with the comparator module;
wherein the first voltage dividing branch and the second voltage dividing branch satisfy the following conditions:
F＝G*C；
H(i)＝K(i)；
f is the resistance value of the nth resistor in the second voltage division branch, and G is the resistance value of the nth resistor in the first voltage division branch; i is any positive integer between 1 and N-1, H (i) is the resistance value of the ith resistor in the second voltage division branch, and K (i) is the resistance value of the ith resistor in the first voltage division branch.
5. The precharge completion judgment circuit according to claim 1, further comprising: a first power supply connected to the comparator module and the one-way digital isolation module, a second power supply connected to the one-way digital isolation module, and
and the power isolation module is connected between the first power supply and the second power supply and is configured to perform power conversion.
6. The precharge completion determination circuit of claim 1, wherein the power isolation module comprises: the direct current converter comprises a direct current converter, a first capacitor, a first inductor, a second capacitor and a first diode;
the first end of the first capacitor and the power output anode of the direct current converter are connected to the first power supply in common, the second end of the first capacitor and the power output cathode of the direct current converter are connected to the ground in common, the first end of the first inductor is connected to the power input anode of the direct current converter in common, the second end of the first inductor, the first end of the second capacitor and the cathode of the first diode are connected to the second power supply in common, and the anode of the first diode, the second end of the second capacitor and the power input cathode of the direct current converter are connected to the ground in common.
7. The precharge completion judgment circuit as claimed in claim 5, wherein the comparator block comprises: a comparator chip and a first resistor;
the positive signal input pin of the comparator chip is connected with the first voltage division module, the negative signal input pin of the comparator chip is connected with the second voltage division module, the grounding pin of the comparator chip is grounded, the power pin of the comparator chip and the first end of the first resistor are connected to a first power supply in a sharing mode, and the second end of the first resistor and the signal output end of the comparator chip are connected to the single-path digital isolation module in a sharing mode.
8. The precharge completion judgment circuit according to claim 5, wherein the single-path digital isolation module is a photocoupler.
9. The precharge completion decision circuit of claim 5, wherein the one-way digital isolation module comprises: the digital isolation chip, the third capacitor and the fourth capacitor;
the first end of the third capacitor and the first power pin of the digital isolation chip are connected to the first power supply, the second end of the third capacitor and the first ground pin of the digital isolation chip are connected to the ground, the first end of the fourth capacitor and the second power pin of the digital isolation chip are connected to the second power supply, the second end of the fourth capacitor and the second ground pin of the digital isolation chip are connected to the ground, the signal input pin of the digital isolation chip is connected to the comparator module, and the signal output pin of the digital isolation chip is used for outputting the driving signal.
10. A pre-charge completion judgment method of a motor is characterized by comprising the following steps:
the method comprises the steps of carrying out voltage division sampling on voltage of a motor bus to output first voltage;
dividing and sampling the voltage of a battery bus to output a second voltage; wherein the partial pressure sampling ratio of the motor bus and the partial pressure sampling ratio of the battery bus meet a first preset condition, and the first preset condition is as follows:
W/V≥Q；
w is a divided voltage sampling ratio of the voltage of the motor bus, V is a divided voltage sampling ratio of the voltage of the battery bus, and Q is 85-100%;
generating a charging comparison signal when the first voltage and the second voltage meet a second preset condition;
and converting the charging comparison signal to obtain a driving signal, wherein the driving signal is used for disconnecting a pre-charging circuit of the motor.
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| CN209029972U (en) * | 2018-09-26 | 2019-06-25 | 深圳猛犸电动科技有限公司 | Decision circuitry and battery management system are completed in the precharge of motor |
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| CN111614798A (en) * | 2020-06-10 | 2020-09-01 | 广东思诺伟智能技术有限公司 | Single-line input automatic address allocation circuit |
| CN111614798B (en) * | 2020-06-10 | 2024-02-20 | 广东思诺伟智能技术有限公司 | Automatic address distribution circuit with single-line input |
| CN112068034A (en) * | 2020-09-29 | 2020-12-11 | 深圳市嘉昱机电有限公司 | Circuit and equipment for detecting power failure of direct-current power supply |
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