CN112600165A - Electric automobile motor overcurrent protection circuit and electric automobile motor - Google Patents
Electric automobile motor overcurrent protection circuit and electric automobile motor Download PDFInfo
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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
- H02H7/0833—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 for electric motors with control arrangements
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Abstract
The invention discloses an over-current protection circuit of an electric automobile motor, which comprises a current sensor, a voltage follower circuit and a controller unit MCU circuit, wherein the current sensor is a motor direct current input end current sensor and/or a motor three-phase end current sensor and is used for respectively acquiring a motor direct current input end current signal and a motor three-phase end current signal, the output end of the current sensor is connected with the input end of the voltage follower circuit, the voltage follower circuit is used for processing a voltage signal output by the current sensor, the output end of the voltage follower circuit is connected to the controller unit MCU circuit, and the controller unit MCU circuit is used for judging whether the current has over-current and executing an over-current protection strategy when the current is over-current. According to the invention, the added voltage follower is used for processing the analog voltage signal output by the current sampling sensor, so that the possible interference of the analog voltage signal is shielded, and the acquired data is more accurate.
Description
Technical Field
The invention relates to the field of electric automobile electric drive systems, in particular to an electric automobile motor overcurrent protection circuit and an electric automobile motor.
Background
The traditional fuel automobile industry faces huge challenges due to energy shortage and climate warming, and energy-saving and environment-friendly electric automobiles are more and more concerned and begin to go to the market from laboratories. At present, the mutual conversion task of electric energy and mechanical energy on the electric automobile is completed by a motor. When the motor is operated, if the motor controller is improperly controlled or the motor itself is abnormal, the current of the three phase lines of the motor may be increased, that is, the current is often referred to as "overcurrent". If the tolerance of the motor and motor controller components is exceeded, the components may be damaged. At present, a special overcurrent protection scheme is set in a motor controller of an electric automobile, and in the aspect of hardware, a three-phase current signal of a motor is converted into a voltage signal through a current acquisition element, a main control module receives the voltage signal and then carries out judgment processing, when the voltage signal is determined to be overcurrent, PWM signal output is immediately turned off, and meanwhile, an overcurrent fault code is sent to the outside, so that the fact that the motor and the motor controller system are in a fault state and cannot continue to operate is explained for a whole automobile controller. In the prior art, voltage signals acquired by a current acquisition element are not subjected to signal filtering processing, and voltage signals output by the current acquisition element are possibly interfered to cause overcurrent misjudgment; and only three-phase current is collected, and current at the direct current input end is not collected and subjected to overcurrent protection.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an overcurrent protection circuit of an electric automobile motor and the electric automobile motor, which are used for realizing more reliable protection on motor overcurrent.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides an electric automobile motor overcurrent protection circuit, includes current sensor, voltage follower circuit, controller unit MCU circuit, current sensor is motor direct current input end current sensor and/or motor three-phase end current sensor for gather motor direct current input end current signal and motor three-phase end current signal respectively, its output and voltage follower circuit's input are connected, voltage follower circuit is used for handling the voltage signal of current sensor output, and its output is connected to controller unit MCU circuit, controller unit MCU circuit is used for judging whether the electric current has the overcurrent and carries out the overcurrent protection strategy when the overcurrent.
The voltage follower circuit comprises an operational amplifier U1, a resistor R1, capacitors C1 and C2, the output end of the current sensor is connected to the non-inverting input end of the operational amplifier U1 through the resistor R1, the non-inverting input end is grounded through the capacitor C1, an RC filter circuit consisting of the resistor R1 and the capacitor C1 filters signals of the non-inverting input end of an input value, a grounding pin of the operational amplifier U1 is grounded, and power supply pins are respectively connected with a +5V power supply and grounded through the C2; the inverting input terminal of the operational amplifier U1 is connected to the output terminal of the operational amplifier, and the output terminal of the operational amplifier U1 serves as the output terminal of the voltage follower circuit.
The controller unit MCU receiving circuit includes: the RC filter circuit comprises a resistor R2 and a capacitor C3, the output end of the voltage follower circuit is connected to the input end of the controller unit MCU through a resistor R2, and the input end of the MCU is grounded with the resistor R2 through a capacitor C3; and the controller unit MCU is used for judging whether the voltage is in an overcurrent state or not after processing according to the received voltage signal and executing an overcurrent protection strategy in the overcurrent state.
The protection circuit further comprises a current-voltage comparison circuit and a programmable device unit CPLD circuit, wherein the current-voltage comparison circuit compares an input output voltage value of the voltage follower with a set upper limit voltage and a set lower limit voltage, and then outputs high-level and low-level signals for representing whether the current exceeds a current preset range, and the programmable device unit CPLD circuit executes a protection strategy after recognizing the current passing signal through the high-level and the low-level.
The current-voltage comparison circuit comprises a negative current-voltage comparison circuit and a positive current-voltage comparison circuit, wherein the negative current-voltage comparison circuit comprises an operational amplifier U2B, resistors R3, R4, R5 and a capacitor C4, the output end of the voltage follower circuit is connected with the non-inverting input end of the operational amplifier U2B through a resistor R5, and the non-inverting input end of the voltage follower circuit is grounded with the resistor R5 through the capacitor C4; the inverting input end of the operational amplifier U2B is connected with a +5V power supply through a resistor R3 and is grounded through a resistor R4, and the output end of the operational amplifier U2B is connected with the input end of the CPLD circuit;
the positive current-voltage comparison circuit comprises an operational amplifier U2A, resistors R6, R7 and R8, capacitors C5, C6 and C7, the output end of the voltage follower circuit is connected with the inverting input end of the operational amplifier U2A through the resistor R6, and the inverting input end of the operational amplifier U2A is grounded with the R6 through the capacitor C5; the non-inverting input end of the operational amplifier U2A is connected with a +5V power supply through a resistor R7, and the resistor R7 is connected with the non-inverting input end through a resistor R8; the output terminal of the operational amplifier U2A is connected to the input terminal of the programmable device unit CPLD circuit.
The programmable device unit CPLD circuit comprises a programmable device unit CPLD, resistors R9, R10, a diode D1 and a capacitor C8, wherein the output end of the current-voltage comparison circuit is connected with the anode of the diode D1, the cathode of the diode is connected with the input end of the CPLD through a resistor R10, the input end of the CPLD and the R10 are grounded through a capacitor C8, the capacitor C8 and the resistor R10 form a filter circuit, and the anode of the diode D1 is connected with a +5V power supply through a resistor R9.
The electric automobile motor adopts the overcurrent protection circuit for overcurrent protection.
The invention has the advantages that: the added voltage follower is used for processing the analog voltage signal output by the current sampling sensor, so that the possible interference of the analog voltage signal is shielded, and the acquired data is more accurate; two sets of protection are adopted, one set of protection is carried out by the MCU, and the other protection mode is provided by the comparison circuit and the CPLD, so that the overcurrent protection is more reliable; the acquisition and the safety judgment of the direct current input end of the motor are added, and the safe operation of the motor is further protected.
Drawings
The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:
FIG. 1 is a circuit diagram of an overcurrent protection circuit of an electric vehicle motor according to the present invention.
Detailed Description
The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.
Example 1:
as shown in fig. 1, an electric vehicle motor overcurrent protection circuit includes a current sensor, a voltage follower circuit, a controller unit MCU circuit, the current sensor is a motor dc input end current sensor and/or a motor three-phase end current sensor, and is configured to collect a motor dc input end current signal and a motor three-phase end current signal respectively, an output end of the current sensor is connected to an input end of the voltage follower circuit, the voltage follower circuit is configured to process a voltage signal output by the current sensor, an output end of the voltage follower circuit is connected to the controller unit MCU circuit, and the controller unit MCU circuit is configured to determine whether an overcurrent exists in a current or not and execute an overcurrent protection strategy when the overcurrent occurs.
The voltage follower circuit comprises an operational amplifier U1, a resistor R1, capacitors C1 and C2, the output end of the current sensor is connected to the non-inverting input end of the operational amplifier U1 through a resistor R1, the non-inverting input end is grounded through a capacitor C1, an RC filter circuit consisting of the resistor R1 and the capacitor C1 filters signals of the non-inverting input end of an input value, a grounding pin of the operational amplifier U1 is grounded, and power supply pins are respectively connected with a +5V power supply and grounded through the C2; the inverting input terminal of the operational amplifier U1 is connected to the output terminal of the operational amplifier, and the output terminal of the operational amplifier U1 serves as the output terminal of the voltage follower circuit.
The controller unit MCU receiving circuit includes: the RC filter circuit comprises a resistor R2 and a capacitor C3, the output end of the voltage follower circuit is connected to the input end of the controller unit MCU through a resistor R2, and the input end of the MCU is grounded with the resistor R2 through a capacitor C3; the controller unit MCU is used for judging whether the voltage signal is in an overcurrent state or not after being processed according to the received voltage signal, and executing an overcurrent protection strategy in the overcurrent state.
The protection circuit further comprises a current-voltage comparison circuit and a programmable device unit CPLD circuit, wherein the current-voltage comparison circuit compares an input output voltage value of the voltage follower with a set upper limit voltage and a set lower limit voltage, and then outputs high-level and low-level signals for representing whether the current exceeds a current preset range, and the programmable device unit CPLD circuit executes a protection strategy after recognizing the current passing signal according to the high-level and the low-level.
The current-voltage comparison circuit comprises a negative current-voltage comparison circuit and a positive current-voltage comparison circuit, the negative current-voltage comparison circuit comprises an operational amplifier U2B, a resistor R3, a resistor R4, a resistor R5 and a capacitor C4, the output end of the voltage follower circuit is connected with the non-inverting input end of the operational amplifier U2B through a resistor R5, and the non-inverting input end of the voltage follower circuit is grounded with the resistor R5 through the capacitor C4; the inverting input end of the operational amplifier U2B is connected with a +5V power supply through a resistor R3 and is grounded through a resistor R4, and the output end of the operational amplifier U2B is connected with the input end of the CPLD circuit;
the positive current-voltage comparison circuit comprises an operational amplifier U2A, resistors R6, R7 and R8, capacitors C5, C6 and C7, the output end of the voltage follower circuit is connected with the inverting input end of the operational amplifier U2A through the resistor R6, and the inverting input end of the operational amplifier U2A is grounded with the R6 through the capacitor C5; the non-inverting input end of the operational amplifier U2A is connected with a +5V power supply through a resistor R7, and the resistor R7 is connected with the non-inverting input end through a resistor R8; the output terminal of the operational amplifier U2A is connected to the input terminal of the programmable device unit CPLD circuit.
The programmable device unit CPLD circuit comprises a programmable device unit CPLD, resistors R9, R10, a diode D1 and a capacitor C8, wherein the output end of the current-voltage comparison circuit is connected with the anode of the diode D1, the cathode of the diode is connected with the input end of the CPLD through a resistor R10, the input end of the CPLD and the R10 are grounded through a capacitor C8, the capacitor C8 and the resistor R10 form a filter circuit, and the anode of the diode D1 is connected with a +5V power supply through a resistor R9.
This scheme is to the voltage signal of current sampling component output, the voltage value of the output of direct current input and three-phase terminal current acquisition component is handled through voltage follower circuit earlier, voltage follower has the effect of buffering and isolation, can shield the interference of external signal to this analog voltage signal, controller unit MCU is given to voltage follower output, MCU receives analog voltage signal, the output voltage value through current sampling component is worth the corresponding relation conversion with the electric current and is obtained the current value this moment, then judge the processing. The output end of the voltage follower is sent to a comparison link formed by double comparators, and an output signal of the comparison link is directly sent to a programmable device unit CPLD as a first signal. In the comparison step, the overcurrent protection limit is set by setting the upper limit voltage and the lower limit voltage of the comparator. Once the voltage signal output by the current acquisition element is higher than the upper limit voltage or lower than the lower limit voltage, the high level signal output by the comparison link is changed into a low level signal, the CPLD identifies the low level and immediately takes a protective measure, the PWM signal output is immediately turned off, and an overcurrent fault code is simultaneously sent to the outside, so that the situation that the motor and the motor controller system are in a fault state and cannot continue to operate is explained to the whole vehicle controller.
As the circuit shown in figure 1, the principle of the current value sampling and overcurrent protection circuit for the direct current input end and the three-phase output end of the motor of the electric automobile comprises that the acquisition of a current signal of the direct current input end is added on the basis of the original function, and meanwhile, a voltage follower is added to process an analog voltage signal output by a current sampling element. Because the current value sampling and protection circuits of the direct current input end and the three-phase input end are completely the same, only the current value sampling and overcurrent protection circuit principle of the direct current input end is explained here. The circuit consists of a current sampling element, a voltage follower circuit, a controller unit MCU receiving circuit, a negative current voltage comparator circuit, a positive current voltage comparator circuit and a programmable device unit CPLD receiving circuit. The current sampling element consists of a Hall current sensor, the Hall current sensor collects current signals and converts the current signals into voltage signals, the voltage signals are output from 0V to 5V, 2.5V is output to indicate that the current value is 0, the output of less than 2.5V indicates that negative current is collected, the output of more than 2.5V indicates that the negative current is larger, the output of more than 2.5V indicates that positive current is collected, and the output of more than 2V indicates that the positive current is larger. The voltage follower circuit is composed of a power supply of R1, a power supply of C1, a power supply of C2, a power supply of U1, a power supply of 5V and GND, a power supply part of the circuit, an operational amplifier of U1, an RC filter circuit composed of R1 and C1 and used for filtering an input voltage signal, and a filter capacitor of the power supply of U1 is a capacitor of C2. The receiving circuit of the controller unit MCU consists of R2, C3 and the controller unit MCU, the RC filter circuit is formed by R2 and C3, voltage signals at the output end of the voltage follower are filtered, the controller unit MCU receives the voltage signals, analyzes the voltage signals, converts the voltage signals according to the corresponding relation between the output voltage value and the current value of the Hall current sensor to obtain a current value, and the controller unit MCU processes the current value according to the measured current value. The negative current-voltage comparator circuit consists of R3, R4, R5, C4, U2B (U2 one-way operational amplifier), a 5V power supply and GND. The output voltage of the voltage follower is sent to the inverting input end of the U2B, the R3, the R4, the 5V power supply and the GND form a resistance voltage division circuit, the resistance values of the R3 and the R4 are set according to the voltage value corresponding to the negative current needing to be protected, and the voltage value is always smaller than 2.5V according to the characteristic of the output voltage of the Hall sensor. R5 and C4 form an RC filter circuit for filtering the voltage signal at the output end of the voltage follower. The positive current-voltage comparator consists of U2B (U2 one-way operational amplifier), R6, R7, R8, C5, C6, C7, 5V power supply, GND, 15V power supply and negative 15V power supply. The power supply comprises a 15V power supply and a negative 15V power supply, wherein the U2 is powered by the C6, the filter capacitor of the 15V power supply and the C7 of the negative 15V power supply, the output voltage of a voltage follower is sent to the non-inverting input end of the U2A, the 5V power supply, the R7, the R8 and GND form a resistance voltage division circuit, the resistance values of R7 and R7 are set according to the voltage value corresponding to the positive current needing to be protected, and the voltage value is certainly larger than 2.5V according to the characteristic of the output voltage of the Hall sensor. The receiving circuit of the programmable device unit CPLD is composed of a D1 power supply, a 5V power supply, an R9 power supply, an R10 power supply, a C8 power supply and the programmable device unit CPLD, the 5V power supply and the R9 power supply form a resistance pull-up circuit, when the output end of the voltage comparator is open-circuit, a signal is pulled up to be high level, the R10 power supply and the C8 power supply form a filter circuit, the output signal of the voltage comparator is filtered, the programmable device unit CPLD receives the output signal of the voltage comparator, and after the motor overcurrent signal is received, a protection strategy is executed.
The working process of the power supply is as follows, when the current value is normal, the voltage value output by the voltage follower is between the negative current protection voltage value and the positive current protection voltage value. In the negative current-voltage comparator circuit, the output voltage of the voltage follower received by the non-inverting input end is higher than the negative current protection voltage value set by the inverting input end, and the non-inverting input end of the voltage comparator is higher than the negative input end, so that the output end of the negative current-voltage comparator is open-circuited and pulled to be high level by the pull-up circuit. In the positive current-voltage comparator circuit, the output voltage of the voltage follower received by the inverting input end is lower than the positive current protection voltage value set by the non-inverting input end, and the non-inverting input end of the voltage comparator is higher than the negative input end, so that the output end of the positive current-voltage comparator is open-circuited and pulled to be high level by the pull-up circuit. Therefore, when the programmable device unit CPLD receives a high-level signal, it indicates that everything is normal, and the protection strategy is not required to be executed. When the current value exceeds the set negative current value, the voltage value output by the voltage follower is smaller than the negative current protection voltage value and is also smaller than the positive current protection voltage value. In the negative current voltage comparator circuit, the output voltage of the voltage follower received by the non-inverting input end is smaller than the negative current protection voltage value set by the inverting input end, and the non-inverting input end of the voltage comparator is smaller than the negative input end, so that the negative current voltage comparator outputs low level. In the positive current-voltage comparator circuit, the output voltage of the voltage follower received by the inverting input end is lower than the positive current protection voltage value set by the non-inverting input end, and the non-inverting input end of the voltage comparator is higher than the negative input end, so that the output end of the positive current-voltage comparator is open-circuited and pulled to be high level by the pull-up circuit. Since the negative current-voltage comparator outputs a low level, the signal received by the programmable device unit CPLD changes to a low level, and the protection strategy is executed. When the current value exceeds the set positive current protection value, the voltage value output by the voltage follower is greater than the negative current protection voltage value and is also greater than the positive current protection voltage value. In the negative current-voltage comparator circuit, the output voltage of the voltage follower received by the non-inverting input end is higher than the negative current protection voltage value set by the inverting input end, and the non-inverting input end of the voltage comparator is higher than the negative input end, so that the output end of the negative current-voltage comparator is open-circuited and pulled to be high level by the pull-up circuit. In the positive current-voltage comparator circuit, the output voltage of the voltage follower received by the inverting input end is larger than the positive current protection voltage value set by the non-inverting input end, and the positive current-voltage comparator outputs low level because the non-inverting input end of the voltage comparator is smaller than the negative input end. Since the positive current-voltage comparator outputs a low level, the signal received by the programmable device unit CPLD changes to a low level, and the protection strategy is executed. No matter the current value exceeds the set negative current or positive current value, the programmable device unit CPLD receives the low level signal, and at the moment, the CPLD can execute the protection strategy, so that the protection strategies of positive current overcurrent and negative current overcurrent can be well performed. The overcurrent protection strategy comprises the steps of transmitting an overcurrent fault signal to the outside and outputting and executing overcurrent protection actions, wherein the overcurrent protection actions comprise the step of closing the power supply of a motor and the like.
The current signal acquisition system has the advantages that the acquisition of the current signal of the direct current input end is increased, the overcurrent of the direct current input end can be protected, and the overcurrent failure risk can be reduced. The voltage follower processes the analog voltage signal output by the current sampling element, so that the interference on the analog voltage signal is shielded, and a good analog voltage signal can be obtained. The motor current monitoring and overcurrent protection circuit has great safety and reliability in application.
Example 2:
an electric automobile motor, the electric automobile motor adopts the electric automobile motor overcurrent protection circuit in embodiment 1 to carry out overcurrent protection, and the electric automobile motor adopts the overcurrent protection circuit in embodiment 1 to carry out overcurrent protection on the motor, thereby realizing the protection of the electric automobile motor.
It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.
Claims (7)
1. The utility model provides an electric automobile motor overcurrent protection circuit which characterized in that: including current sensor, voltage follower circuit, controller unit MCU circuit, current sensor is motor direct current input end current sensor and/or motor three phase end current sensor for gather motor direct current input end current signal and motor three phase end current signal respectively, its output is connected with the input of voltage follower circuit, voltage follower circuit is used for handling the voltage signal of current sensor output, and its output is connected to controller unit MCU circuit, controller unit MCU circuit is used for judging whether the electric current has the overcurrent and carries out the overcurrent protection strategy when the overcurrent.
2. The electric vehicle motor overcurrent protection circuit of claim 1, characterized in that: the voltage follower circuit comprises an operational amplifier U1, a resistor R1, capacitors C1 and C2, the output end of the current sensor is connected to the non-inverting input end of the operational amplifier U1 through the resistor R1, the non-inverting input end is grounded through the capacitor C1, an RC filter circuit consisting of the resistor R1 and the capacitor C1 filters signals of the non-inverting input end of an input value, a grounding pin of the operational amplifier U1 is grounded, and power supply pins are respectively connected with a +5V power supply and grounded through the C2; the inverting input terminal of the operational amplifier U1 is connected to the output terminal of the operational amplifier, and the output terminal of the operational amplifier U1 serves as the output terminal of the voltage follower circuit.
3. The electric vehicle motor overcurrent protection circuit of claim 1 or 2, characterized in that: the controller unit MCU receiving circuit includes: the RC filter circuit comprises a resistor R2 and a capacitor C3, the output end of the voltage follower circuit is connected to the input end of the controller unit MCU through a resistor R2, and the input end of the MCU is grounded with the resistor R2 through a capacitor C3; and the controller unit MCU is used for judging whether the voltage is in an overcurrent state or not after processing according to the received voltage signal and executing an overcurrent protection strategy in the overcurrent state.
4. The overcurrent protection circuit for the motor of the electric vehicle as recited in claim 1, wherein: the protection circuit further comprises a current-voltage comparison circuit and a programmable device unit CPLD circuit, wherein the current-voltage comparison circuit compares an input output voltage value of the voltage follower with a set upper limit voltage and a set lower limit voltage, and then outputs high-level and low-level signals for representing whether the current exceeds a current preset range, and the programmable device unit CPLD circuit executes a protection strategy after recognizing the current passing signal through the high-level and the low-level.
5. The overcurrent protection circuit for the motor of the electric vehicle as recited in claim 4, wherein: the current-voltage comparison circuit comprises a negative current-voltage comparison circuit and a positive current-voltage comparison circuit, wherein the negative current-voltage comparison circuit comprises an operational amplifier U2B, resistors R3, R4, R5 and a capacitor C4, the output end of the voltage follower circuit is connected with the non-inverting input end of the operational amplifier U2B through a resistor R5, and the non-inverting input end of the voltage follower circuit is grounded with the resistor R5 through the capacitor C4; the inverting input end of the operational amplifier U2B is connected with a +5V power supply through a resistor R3 and is grounded through a resistor R4, and the output end of the operational amplifier U2B is connected with the input end of the CPLD circuit;
the positive current-voltage comparison circuit comprises an operational amplifier U2A, resistors R6, R7 and R8, capacitors C5, C6 and C7, the output end of the voltage follower circuit is connected with the inverting input end of the operational amplifier U2A through the resistor R6, and the inverting input end of the operational amplifier U2A is grounded with the R6 through the capacitor C5; the non-inverting input end of the operational amplifier U2A is connected with a +5V power supply through a resistor R7, and the resistor R7 is connected with the non-inverting input end through a resistor R8; the output terminal of the operational amplifier U2A is connected to the input terminal of the programmable device unit CPLD circuit.
6. The overcurrent protection circuit for the motor of the electric vehicle as set forth in claim 4 or 5, wherein: the programmable device unit CPLD circuit comprises a programmable device unit CPLD, resistors R9, R10, a diode D1 and a capacitor C8, wherein the output end of the current-voltage comparison circuit is connected with the anode of the diode D1, the cathode of the diode is connected with the input end of the CPLD through a resistor R10, the input end of the CPLD and the R10 are grounded through a capacitor C8, the capacitor C8 and the resistor R10 form a filter circuit, and the anode of the diode D1 is connected with a +5V power supply through a resistor R9.
7. An electric automobile motor which characterized in that: the electric automobile motor is provided with the electric automobile motor overcurrent protection circuit according to any one of claims 1 to 6.
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| CN202011532939.4A CN112600165A (en) | 2020-12-21 | 2020-12-21 | Electric automobile motor overcurrent protection circuit and electric automobile motor |
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| CN202011532939.4A CN112600165A (en) | 2020-12-21 | 2020-12-21 | Electric automobile motor overcurrent protection circuit and electric automobile motor |
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| CN113118676A (en) * | 2021-04-16 | 2021-07-16 | 湖南翰坤实业有限公司 | Welding time delay device |
| CN113319872A (en) * | 2021-06-18 | 2021-08-31 | 北京京东乾石科技有限公司 | Robot control device and method |
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| CN110389249A (en) * | 2018-04-23 | 2019-10-29 | 广州小鹏汽车科技有限公司 | A kind of detection device |
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| CN113319872A (en) * | 2021-06-18 | 2021-08-31 | 北京京东乾石科技有限公司 | Robot control device and method |
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Effective date of registration: 20221229 Address after: 241009 No.79 Yongchang Road, economic development zone, Jiujiang District, Wuhu City, Anhui Province Applicant after: WUHU GENERATOR AUTOMOTIVE ELECTRICAL SYSTEMS Co.,Ltd. Address before: 241000 # 2 Workshop at the junction of Yongzhen Road and Huizhou Road, Jiujiang District, Wuhu City, Anhui Province Applicant before: Wuhu Dayang electric drive Co.,Ltd. |
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