CN112542941A - Motor controller and current adjusting method thereof - Google Patents
Motor controller and current adjusting method thereof Download PDFInfo
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- CN112542941A CN112542941A CN202011361259.0A CN202011361259A CN112542941A CN 112542941 A CN112542941 A CN 112542941A CN 202011361259 A CN202011361259 A CN 202011361259A CN 112542941 A CN112542941 A CN 112542941A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- H02H3/087—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 for dc applications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
- H02H7/0854—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load responsive to rate of change of current, couple or speed, e.g. anti-kickback protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
- H02H7/205—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment for controlled semi-conductors which are not included in a specific circuit arrangement
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
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Abstract
The invention discloses a motor controller and a current adjusting method thereof, wherein the motor controller comprises a control board and a drive board, and the drive board comprises a transformer, a drive circuit, an IGBT module, a high-voltage current sampling circuit, a switch circuit, a power supply management circuit and a low-voltage current sampling circuit. If the direct current bus current collected by the high-voltage current sampling circuit is greater than a high-voltage overcurrent protection threshold value stored in the driving circuit, the driving circuit outputs a low level to block PWM waves to turn off the IGBT module, then the driving circuit outputs a level overturning signal to an overcurrent protection reset end of the power management circuit, the power management circuit resets, the switching circuit is continuously turned off, the transformer stops working, and positive/negative voltage for driving the gate pole of the IGBT module to be turned on/off disappears; when the feedback current collected by the low-voltage current sampling circuit is smaller or larger, the power-on time of the switch circuit is controlled through the power management circuit, and then the power supply current of the low-voltage side is adjusted, so that the motor controller works stably.
Description
Technical Field
The invention belongs to the field of safety protection of a motor controller of a pure electric vehicle, and particularly relates to a motor controller and a current adjusting method thereof.
Background
With the progress of strategic planning of new energy automobiles in China and in China, new energy automobiles are accepted and favored by more and more people. As the pure electric vehicle which is most concerned in the field of new energy vehicles, the improvement of the safety and the reliability of the pure electric vehicle is a constantly striving target of engineers. The motor controller is a core component for power control of the pure electric vehicle and is a central brain of the vehicle, so that stable and reliable operation of the motor controller is directly related to safe driving conditions of the whole vehicle. However, in the actual driving process, faults such as overvoltage, overcurrent and overtemperature always occur to the motor controller, so that power is interrupted and the vehicle is forced to stop.
Taking overcurrent as an example, due to sudden change of load or environmental disturbance and sudden failure of devices, a partial or complete short circuit of the motor controller is caused, thereby causing overcurrent. Partial overcurrent can burn out partial electronic components, so that faults are reported, and normal running of the vehicle is influenced. Serious overcurrent problems can burn out IGBT (Insulated Gate Bipolar Transistor) modules, and even more so, can damage high voltage power battery modules. Therefore, the current regulation and protection problem of the motor controller has been a problem that must be considered and solved by hardware engineers.
CN106911122A discloses a motor controller overcurrent protection device, a motor controller, and an electric vehicle, which adopts a current sensing module to actually collect current signals, and converts two-phase current signals into voltage signals measurable by an operational amplifier through a current conversion module, and then compares the voltage signals with an upper threshold voltage and a lower threshold voltage to determine whether overcurrent occurs. The current acquisition precision of the method is easily interfered by the environment, errors are generated in the acquisition process along with the time extension, only overcurrent can be judged, and specific protection measures after overcurrent are not described in detail.
The overcurrent protection of the existing motor controller mainly comprises the following steps: the high-voltage current sampling circuit transmits an overcurrent fault signal to the control board for judgment, the control board sends a turn-off instruction to the drive circuit for execution after judging that an overcurrent condition occurs, and the drive circuit outputs a low level to block the PWM wave so as to turn off the IGBT module. In the method, a certain time delay exists from the receiving of the overcurrent signal to the wave sealing process of the driving circuit, the delay time may cause the burning of the IGBT module, and the method cannot realize the current regulation.
Disclosure of Invention
The invention aims to provide a motor controller and a current adjusting method thereof, which are used for adjusting current, so that the motor controller works stably and quickly protects an IGBT module when overcurrent occurs.
The motor controller comprises a control board and a drive board, wherein the drive board comprises a transformer, a drive circuit, an IGBT module, a high-voltage current sampling circuit, a switch circuit, a power management circuit and a low-voltage current sampling circuit; the transformer is a flyback transformer, a winding mode of a primary side and three secondary sides is adopted, one end of the primary side of the transformer is used for being externally connected with a low-voltage power supply module, the other end of the primary side of the transformer is connected with a first connecting end of a switch circuit, a second connecting end of the switch circuit is connected with a low-voltage ground, a power supply end of a power supply management circuit is used for being externally connected with the low-voltage power supply module, an output end of the power supply management circuit is connected with a control end of the switch circuit, a first connecting end of a low-voltage current sampling circuit is connected with a first secondary side of the transformer, a second connecting end of the transformer is connected with the low-voltage ground, an output end of the low-voltage current sampling circuit is connected with a current regulating end of the power supply management circuit, a positive voltage end of a driving circuit is connected with a second secondary side of the, the second connection end of the high-voltage current sampling circuit is connected with a high-voltage ground, the output end of the high-voltage current sampling circuit is connected with the sampling end of the driving circuit, and the overcurrent feedback end of the driving circuit is connected with the overcurrent protection reset end of the power management circuit.
Preferably, the switching circuit is an MOS transistor, a drain (i.e., the first connection end of the switching circuit) of the MOS transistor is connected to the other end of the primary side of the transformer, a source (i.e., the second connection end of the switching circuit) is connected to the low-voltage ground, and a gate (i.e., the control end of the switching circuit) is connected to the output end of the power management circuit.
The invention relates to a current regulation method of a motor controller, which comprises the following steps:
the driving circuit monitors the direct current bus current collected by the high-voltage current sampling circuit in real time, if the direct current bus current is larger than a high-voltage overcurrent protection threshold value stored in the driving circuit (namely, if an overcurrent condition occurs on a high-voltage side), the driving circuit outputs a low level to block PWM waves to turn off the IGBT module, then the driving circuit outputs a level overturning signal to an overcurrent protection reset end of the power management circuit, the power management circuit resets, the switching circuit is continuously turned off, the transformer stops working, and positive/negative voltage driving the gate pole of the IGBT module to be turned on/off disappears.
The power supply management circuit monitors the feedback current collected by the low-voltage current sampling circuit in real time, if the feedback current is smaller than the lower limit value of the current stored in the power supply management circuit, the power supply management circuit increases the on-time of the switch circuit, if the feedback current is larger than the current upper limit value stored in the power management circuit and smaller than the low-voltage overcurrent protection threshold value stored in the power management circuit, the power management circuit reduces the turn-on time of the switch circuit, if the feedback current is greater than or equal to the current lower limit value and less than or equal to the current upper limit value, the power supply management circuit controls the on-time of the switch circuit to be kept unchanged, if the feedback current is larger than or equal to the low-voltage overcurrent protection threshold (namely, if an overcurrent condition occurs on the low-voltage side), the power management circuit controls the switching circuit to be continuously turned off, the transformer stops working, and the positive/negative voltage for driving the gate pole of the IGBT module to be turned on/off disappears.
The invention has the following effects:
(1) when the drive circuit monitors that the overcurrent condition occurs on the high-voltage side, the drive circuit directly outputs a low level to block the PWM wave, so that the IGBT module is switched off, the processing time is greatly shortened, and the reliability is high.
(2) When the overcurrent condition occurs on the high-voltage side, if the drive circuit cannot block the PWM wave due to other reasons, the transformer stops working at the moment, no current is output from the second secondary side and the third secondary side of the transformer, the positive/negative voltage for driving the gate pole of the IGBT module to be switched on/off disappears, the IGBT module cannot be switched on (namely keeps a switching-off state), and the overcurrent protection is carried out by two measures of blocking the PWM wave and disconnecting the voltage supply, so that the double protection of the IGBT module is realized.
(3) When the feedback current collected by the low-voltage current sampling circuit is smaller or larger, the power supply management circuit controls the on-time of the switch circuit so as to adjust the power supply current of the low-voltage side, so that the power supply current of the low-voltage side is kept stable, and the motor controller works stably.
(4) When the overcurrent condition occurs on the low-voltage side, the power supply management circuit controls the switch circuit to be continuously turned off, the transformer stops working, the phenomenon that the low-voltage power supply module is burnt down due to the fact that instant overshoot current is superposed on the low-voltage power supply module is avoided, and meanwhile the IGBT module is protected.
Drawings
Fig. 1 is a schematic block diagram of a circuit of the motor controller according to the present embodiment.
Fig. 2 is a voltage waveform diagram of the power management circuit output in the present embodiment.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The motor controller shown in fig. 1 includes a control board 12 and a driving board, and the driving board includes a transformer 1, a driving circuit 2, an IGBT module 3, a high-voltage current sampling circuit 4, a switching circuit 5, a power management circuit 6, and a low-voltage current sampling circuit 7. The switching circuit 5 is an MOS tube, the transformer 1 is a flyback transformer, a primary side three secondary side winding mode is adopted, secondary side current can be generated after the secondary side of the transformer 1 is connected with a load, and magnetic force lines formed by the secondary side current simultaneously penetrate through a primary side coil so as to induce primary side current on the primary side. The driving circuit 2 comprises an IGBT driving chip and a chip peripheral auxiliary circuit, and the driving circuit 2 controls the on and off of the IGBT module 3 by controlling the PWM wave.
One end of the primary side of the transformer 1 is used for being externally connected with a low-voltage power supply module 10, the low-voltage power supply module 10 comprises a 12V small storage battery and a plurality of filter capacitors, the other end of the primary side of the transformer 1 is connected with a drain electrode of an MOS (metal oxide semiconductor) tube through a 012 branch, a source electrode of the MOS tube is connected with a low-voltage ground 8 through a 013 branch, a power supply end of a power management circuit 6 is used for being externally connected with the low-voltage power supply module 10, an output end of the power management circuit 6 is connected with a grid electrode of the MOS tube through a 015 branch, the power management circuit 6 controls the on and off of the MOS tube through a sent voltage waveform with a certain duty ratio, the on and off of the low-voltage power supply module 10 and a primary side loop of the transformer are realized, when the MOS tube is switched on, the primary side of the transformer. The first connecting end of the low-voltage current sampling circuit 7 is connected with the first secondary side of the transformer 1 through a 009 branch, the second connecting end of the low-voltage current sampling circuit 7 is connected with a low-voltage ground 8 through a 011 branch, the output end of the low-voltage current sampling circuit 7 is connected with the current regulating end of the power management circuit 6 through a 010 branch, the positive voltage end of the driving circuit 2 is connected with the second secondary side of the transformer 1 through a 002 branch, the second secondary side of the transformer 1 generates positive voltage with a certain value to the driving circuit 2, the driving circuit 2 drives the gate pole of the IGBT module 3 to be opened (i.e. drives the IGBT module 3 to be conducted) by using the positive voltage, the negative voltage end of the driving circuit 2 is connected with the third secondary side of the transformer 1 through a 016 branch, the third secondary side of the transformer 1 generates negative voltage with a certain value to the driving circuit 2, and the driving circuit 2 drives the gate pole of, the control signal input end of the driving circuit 2 is connected with the control panel 12 through a 017 branch, the control signal output end of the driving circuit 2 is connected with the gate pole of the IGBT module 3 through a 003 branch, the collector of the IGBT module 3 is used for externally connecting a high-voltage power battery pack module 11, the emitter of the IGBT module 3 is connected with the first connection end of the high-voltage current sampling circuit 4 through a 005 branch, the second connection end of the high-voltage current sampling circuit 4 is connected with a high-voltage ground 9 through a 006 branch, the output end of the high-voltage current sampling circuit 4 is connected with the sampling end of the driving circuit 2 through a 007 branch, the overcurrent feedback end of the driving circuit 2 is connected with the overcurrent protection reset end of the power management circuit 6 through a 008 branch, and the direct-current bus current signal acquired by the high-voltage current sampling circuit 4 needs to be converted through.
When the power supply is used, one end of the primary side of the transformer 1 is connected with the low-voltage power supply module 10 through the 001 branch and the power supply end of the power management circuit 6 is connected with the low-voltage power supply module 10 through the 014 branch, and the collector of the IGBT module 3 is connected with the high-voltage power battery pack module 11 through the 004 branch.
The current regulation method of the motor controller comprises the following steps:
the driving circuit 2 monitors the direct current bus current collected by the high-voltage current sampling circuit 4 in real time, if the direct current bus current is larger than a high-voltage overcurrent protection threshold value stored in the driving circuit 2 (namely, if an overcurrent condition occurs at a high-voltage side), the driving circuit 2 outputs a low level to block PWM wave through a control signal output end to turn off the IGBT module 3, then the driving circuit 2 outputs a level overturning signal to an overcurrent protection reset end of the power management circuit 6 through an overcurrent feedback end, the power management circuit 6 resets, the MOS tube is continuously turned off, a charging loop at a primary side of the transformer is continuously disconnected, a primary side coil of the transformer cannot be charged and cannot store energy, no current is correspondingly transmitted to a secondary side, the transformer stops working, no positive voltage and negative voltage are output to the driving circuit 2, and a gate pole of the IGBT module 3 is driven to be turned on/off, the IGBT module 3 remains off and cannot be turned on. Overcurrent protection is carried out by two measures of blocking PWM waves and cutting off voltage supply, and double protection of the IGBT module is realized.
The power management circuit 6 is powered by the low-voltage power module 10 through a 014 branch, and outputs a voltage waveform (see fig. 2) with a certain duty ratio through a 015 branch, so that the on/off time of the MOS tube is controlled; in fig. 2, Toff is the duration of low level, the voltage between the gate and the source of the MOS transistor in this period is very small and is smaller than the turn-on voltage, and the MOS transistor is turned off, so Toff is also called as turn-off time; in fig. 2, Ton is the duration of high level, and at this time, the voltage between the gate and the source of the MOS transistor is greater than the turn-on voltage, and the MOS transistor is turned on, so Ton is also called turn-on time, Ton and Toff together form a period T, Ton/T is called turn-on duty ratio, and Toff/T is called turn-off duty ratio.
When the vehicle is in adverse circumstances and extreme condition, the low voltage power module 10 itself can appear the fluctuation of voltage and electric current, and the secondary of transformer 1 also can receive electromagnetic interference appearance spike current in the twinkling of an eye simultaneously, and spike current can be superimposed on the little storage battery of 12V of low voltage power module 10, can lead to the little storage battery of 12V to burn out when serious, consequently adopts low-voltage current sampling circuit 7 to gather the electric current. The feedback current that low-voltage current sampling circuit 7 gathered passes through the 010 branch road and transmits to power management circuit 6, and the feedback current that low-voltage current sampling circuit 7 gathered is monitored in real time to power management circuit 6: when the feedback current is smaller than the current lower limit value stored in the power management circuit 6, the power management circuit 6 can increase the turn-on time of the MOS tube, namely, the turn-on duty ratio Ton/T in one period is increased, and the turn-off duty ratio Toff/T in one period is reduced, so that the turn-on time of a charging loop of the primary side of the transformer is prolonged, the charging time of the primary side coil of the transformer is prolonged, the stored energy is increased, and the corresponding current transmitted to the secondary side is increased; when the feedback current is larger than the upper limit value of the current stored in the power management circuit 6 and smaller than the low-voltage overcurrent protection threshold value stored in the power management circuit 6, the power management circuit 6 can reduce the turn-on time of the MOS tube, namely, reduce the turn-on duty ratio Ton/T in a period and increase the turn-off duty ratio Toff/T in a period, so that the turn-on time of a charging loop of the primary side of the transformer is shortened, the charging time of a primary side coil of the transformer is shortened, the stored energy is reduced, and the corresponding current transmitted to the secondary side is reduced; when the feedback current is greater than or equal to the lower limit value of the current stored in the power management circuit 6 and less than or equal to the upper limit value of the current stored in the power management circuit 6, it indicates that the supply current at the low voltage side keeps a stable state, and the power management circuit 6 controls the on time of the MOS transistor to be kept unchanged, that is, the on duty ratio Ton/T and the off duty ratio Toff/T in one period are kept unchanged. The regulation of the current is thus performed by means of such a feedback closed-loop control loop. When severe working conditions or interference occur, instantaneous overshoot of feedback current can occur (namely the feedback current is larger than or equal to a low-voltage overcurrent protection threshold value stored in the power management circuit 6, and an overcurrent condition occurs on a low-voltage side), at the moment, the current overshoot can not be inhibited only by the current regulation function, the power management circuit 6 can control the MOS tube to be continuously turned off, namely the turn-off duty ratio Toff/T is 1, the turn-on duty ratio Ton/T is 0 in a period, the primary side charging loop of the transformer is continuously turned off, no current output of the transformer stops working, and therefore overcurrent protection on the low-voltage side is achieved.
Claims (3)
1. A motor controller comprises a control board (12) and a drive board, wherein the drive board comprises a transformer (1), a drive circuit (2), an IGBT module (3) and a high-voltage current sampling circuit (4); the method is characterized in that: the driving board further comprises a switch circuit (5), a power management circuit (6) and a low-voltage current sampling circuit (7); the transformer (1) is a flyback transformer and adopts a winding mode with one primary side and three secondary sides, one primary side end of the transformer (1) is used for being externally connected with a low-voltage power supply module (10), the other primary side end of the transformer is connected with a first connecting end of a switch circuit (5), a second connecting end of the switch circuit (5) is connected with a low-voltage ground (8), a power supply end of a power supply management circuit (6) is used for being externally connected with the low-voltage power supply module, an output end of the power supply management circuit is connected with a control end of the switch circuit (5), a first connecting end of a low-voltage current sampling circuit (7) is connected with a first secondary side of the transformer (1), a second connecting end of the transformer (8) and an output end of the low-voltage current sampling circuit is connected with a current regulating end of the power supply management circuit (6), a positive voltage of a driving circuit (2) is connected with a second secondary side of, The control signal output end is connected with a gate pole of the IGBT module (3), a collector electrode of the IGBT module (3) is used for being externally connected with a high-voltage power battery pack module (11), an emitter electrode of the IGBT module is connected with a first connecting end of the high-voltage current sampling circuit (4), a second connecting end of the high-voltage current sampling circuit (4) is connected with a high-voltage ground (9), an output end of the high-voltage current sampling circuit is connected with a sampling end of the driving circuit (2), and an overcurrent feedback end of the driving circuit (2) is connected with an overcurrent protection reset end of the.
2. The motor controller of claim 1, wherein: the switch circuit (5) is an MOS tube, the drain electrode of the MOS tube is connected with the other end of the primary side of the transformer (1), the source electrode of the MOS tube is connected with a low-voltage ground (8), and the grid electrode of the MOS tube is connected with the output end of the power management circuit (6).
3. A current regulation method of a motor controller according to claim 1 or 2, comprising:
the driving circuit (2) monitors the direct current bus current collected by the high-voltage current sampling circuit (4) in real time, if the direct current bus current is larger than a high-voltage overcurrent protection threshold value stored in the driving circuit (2), the driving circuit (2) outputs a low level to block PWM (pulse-width modulation) waves to turn off the IGBT module (3), then the driving circuit (2) outputs a level overturning signal to an overcurrent protection reset end of the power supply management circuit (6), the power supply management circuit (6) resets, the switching circuit (5) is continuously turned off, the transformer stops working, and positive/negative voltage for driving a gate pole of the IGBT module (3) to be turned on/off disappears;
the power supply management circuit (6) monitors the feedback current collected by the low-voltage current sampling circuit (7) in real time, if the feedback current is smaller than the current lower limit value stored in the power supply management circuit (6), the power supply management circuit (6) increases the on-time of the switch circuit (5), if the feedback current is larger than the current upper limit value stored in the power supply management circuit (6) and smaller than the low-voltage overcurrent protection threshold value stored in the power supply management circuit (6), the power supply management circuit (6) reduces the on-time of the switch circuit (5), if the feedback current is larger than or equal to the current lower limit value and smaller than or equal to the current upper limit value, the power supply management circuit (6) controls the on-time of the switch circuit (5) to be kept unchanged, and if the feedback current is larger than or equal to the low-voltage overcurrent protection threshold value, the power supply management circuit (6) controls the switch circuit (5) to be continuously turned off, the transformer stops working, and the positive/negative voltage driving the gate of the IGBT module (3) to be switched on/off disappears.
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| CN202011361259.0A CN112542941B (en) | 2020-11-27 | 2020-11-27 | Motor controller and current adjusting method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023221526A1 (en) * | 2022-05-16 | 2023-11-23 | 华为数字能源技术有限公司 | Overcurrent protection circuit of power supply system, and device |
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| CN106026712A (en) * | 2016-07-15 | 2016-10-12 | 深圳南云微电子有限公司 | Secondary-side control method and secondary-side control circuit of switching power supply |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023221526A1 (en) * | 2022-05-16 | 2023-11-23 | 华为数字能源技术有限公司 | Overcurrent protection circuit of power supply system, and device |
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| CN112542941B (en) | 2022-05-06 |
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