CN217388540U - Motor drive power supply circuit with protection function - Google Patents
Motor drive power supply circuit with protection function Download PDFInfo
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- CN217388540U CN217388540U CN202220914680.8U CN202220914680U CN217388540U CN 217388540 U CN217388540 U CN 217388540U CN 202220914680 U CN202220914680 U CN 202220914680U CN 217388540 U CN217388540 U CN 217388540U
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The utility model provides a motor drive power supply circuit with protection function, which comprises a transient suppression circuit, an anti-reverse connection circuit, a voltage stabilizing circuit, a filter circuit and a switch circuit which are connected in sequence; a transient suppression circuit for suppressing a high voltage in the vehicle-mounted battery; the anti-reverse connection circuit is used for preventing the voltage output by the transient suppression circuit from flowing reversely; the voltage stabilizing circuit is used for stabilizing the voltage output by the reverse connection preventing circuit; the filter circuit is used for filtering the voltage output by the voltage stabilizing circuit; the switch circuit is used for switching on or switching off the power supply voltage of the shifting motor driving chip output by the filter circuit according to the shifting motor power supply control signal output by the steam motor controller; the utility model discloses can avoid outside on-vehicle battery's high voltage pulse, gear shifting motor internal circuit trouble and voltage to lead to the fact drive circuit's damage and low temperature environment down gear shifting motor driver chip dead band time to cause the influence to shifting, and have low-cost advantage.
Description
Technical Field
The utility model belongs to the technical field of automotive electronics, concretely relates to motor drive power supply circuit with protect function.
Background
Nowadays, automobiles become indispensable travel tools for every family, and along with the continuous development of automobile technology, the degree of automobile electronization is higher and higher. The improvement of the automobile electronization degree can bring better driving experience, simultaneously, the electrical environment of the automobile is more complex, voltage fluctuation is easily generated by an automobile engine in operation due to the switching of switches of different vehicle-mounted electrical appliances and other reasons, the voltage fluctuation can be small-amplitude fluctuation or large-amplitude fluctuation, when the generator generates large-amplitude voltage fluctuation, a vehicle-mounted storage battery can bring high-voltage pulse interference to the electrical appliances for supplying power, and transient high-voltage impact caused by the high-voltage pulse interference can cause voltage fluctuation and damage to circuits in the electrical appliances easily; meanwhile, each electrical appliance is used as a load of the storage battery, and when the internal circuit of the electrical appliance is in failure, if the power supply cannot be cut off in time, not only energy waste can be caused, but also more serious damage can be caused to the internal circuit of the electrical appliance; in addition, if the vehicle-mounted storage battery is reversely connected, the circuit in the electrical appliance can be damaged due to the back electromotive force caused by the reverse voltage in the circuit. The gear shifting actuator is used as a component for controlling gears of a gearbox of the whole vehicle, wherein a gear shifting motor driving system is particularly important for the safety of the whole vehicle. The gear shifting motor driving system is composed of a power circuit and a driving circuit, and the vehicle-mounted storage battery supplies power to a gear shifting motor driving chip in the driving circuit through the power circuit. The gear shifting motor driving chip can have dead time under the low-temperature condition, and the power supply voltage is reduced, so that the gear shifting jitter is caused, and the gear shifting cannot be realized. The damage of the circuit in the electric appliance and the condition of gear shifting shaking and gear shifting failure can cause serious hidden danger to the safety of the whole vehicle.
Therefore, in order to avoid damage to a driving circuit caused by high-voltage pulse of an external vehicle-mounted storage battery, internal circuit faults of the gear shifting motor and voltage backflow and influence on gear shifting caused by dead time of a driving chip of the gear shifting motor in a low-temperature environment, the key of the design of the power supply circuit is to have a protection function. Currently, in the market, automobile parts are widely used at present, a power supply chip special for motor driving is selected to be used for a power supply circuit to meet the requirement of a power supply circuit protection function, but the power supply chip special for motor driving is high in cost, and faults of an internal circuit of a gear shifting motor cannot be monitored. In the prior art, when an internal circuit of the gear shifting motor breaks down, a gear shifting motor driving chip in the driving circuit can feed the fault condition back to the automobile motor controller, and although the automobile motor controller can control the working state of the gear shifting motor according to feedback, the power circuit cannot be controlled, and the power supply to the gear shifting motor driving chip cannot be cut off in time.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve the technical problem that power supply circuit has protect function among the motor drive system of the executor of shifting, provide a motor drive power supply circuit with protect function, can avoid the high-voltage pulse of outside on-vehicle battery, shift motor internal circuit trouble and voltage to lead to the fact drive circuit's damage and shift motor drive chip dead time under the low temperature environment to cause the influence to shifting, and have low-cost advantage.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a motor driving power supply circuit with a protection function comprises a transient suppression circuit, an anti-reverse connection circuit, a voltage stabilizing circuit, a filter circuit and a switch circuit which are sequentially connected;
the transient suppression circuit is used for suppressing high voltage in the vehicle-mounted storage battery;
the anti-reverse connection circuit is used for preventing the voltage output by the transient suppression circuit from flowing reversely;
the voltage stabilizing circuit is used for stabilizing the voltage output by the reverse connection preventing circuit;
the filter circuit is used for filtering the voltage output by the voltage stabilizing circuit;
and the switching circuit is used for switching on or off the power supply voltage of the gear shifting motor driving chip output by the filter circuit according to the gear shifting motor power supply control signal output by the automobile motor controller.
In order to achieve the purpose of preventing the reverse connection of the power supply in the prior art, the reverse connection preventing circuit is generally directly connected with the power supply, however, when the utility model is applied in the automobile, the voltage fluctuation of the vehicle-mounted storage battery can generate high-voltage pulse interference, load throwing is one of the main sources of the high-voltage pulse interference, the voltage input by the vehicle-mounted storage battery can generate 101V load throwing high-voltage pulse interference, the reverse connection prevention circuit can prevent the circuit from being damaged by the reverse connection of the power supply but can not deal with the large high-voltage pulse interference, therefore, in the utility model, the transient suppression circuit is arranged between the vehicle-mounted storage battery and the reverse connection prevention circuit, when the vehicle-mounted power supply is reversely connected and high-voltage pulse exists, firstly, the interference of the high-voltage pulse in the input voltage of the vehicle-mounted storage battery is suppressed by using the transient suppression circuit, and then the voltage output by the transient suppression circuit is prevented from flowing backwards due to the reverse connection of the vehicle-mounted storage battery by using the reverse connection prevention circuit; although the voltage output by the reverse connection preventing circuit is subjected to high-voltage suppression processing through the transient suppression circuit, the situation of insufficient suppression can also exist, so that the voltage is not in the application range of the gear shifting motor, therefore, the utility model discloses in still set up voltage stabilizing circuit, carry out voltage stabilizing processing to the voltage output by the reverse connection preventing circuit, thereby further suppressing the voltage, stabilizing the voltage in the range suitable for the gear shifting motor; the electric environment of the automobile is complex, so that interference current exists in the vehicle-mounted storage battery, and therefore, the filter circuit is arranged to filter the interference current, so that the voltage is more stable; the utility model discloses in set up switch circuit, gear shifting motor power control signal is exported by the inside microprocessor of car machine controller, can reflect whether gear shifting motor's internal circuit breaks down, and switch circuit is according to gear shifting motor power control signal, under the condition that gear shifting motor internal circuit breaks down, turn-offs the supply voltage of the gear shifting motor driver chip through the filter circuit output, under the normal condition of gear shifting motor internal circuit, switches on the supply voltage of the gear shifting motor driver chip through the filter circuit output.
To further limit the technical solution of the present invention, the transient suppression circuit includes a bidirectional transient suppression diode, a first capacitor and a second capacitor, and the first capacitor and the second capacitor are both high frequency capacitors; the first capacitor is connected with a first end of the bidirectional transient suppression diode, the second capacitor is connected with a second end of the bidirectional transient suppression diode, and the second end of the bidirectional transient suppression diode is connected with a grounding end PGND. The utility model discloses in set up two-way transient state and restrain diode, first electric capacity and second electric capacity and constitute transient state suppression circuit, two-way transient state suppresses the diode both ends and does not have the negative and positive polarity branch, when the vehicle-mounted battery joins conversely and there is the condition of high-voltage pulse, can absorb instantaneous big pulse power in two directions, and clamp the voltage to predetermined level, thereby can restrain the high-voltage pulse interference in the vehicle-mounted battery, and do not receive the influence that the vehicle-mounted battery joins conversely; the first capacitor and the second capacitor are both high-frequency capacitors, and high-frequency filtering and electrostatic protection are realized by utilizing the charge-discharge principle of the high-frequency capacitors; the utility model discloses during the implementation, under the normal circumstances of connecting of vehicle-mounted battery, the positive pole and the negative pole of vehicle-mounted battery are connected with the first end and the second end of two-way transient suppression diode respectively, and when the condition that vehicle-mounted battery joins conversely appears, then for the positive pole and the negative pole of vehicle-mounted battery respectively with the second end and the first end of two-way transient suppression diode be connected.
To the further limitation of the technical scheme of the utility model, the reverse connection preventing circuit comprises a first MOS tube, a third capacitor and a first resistor, the third capacitor is a high-frequency capacitor, and the first MOS tube is of a P channel enhancement type with a parasitic diode; the drain electrode of the first MOS tube is connected with a first capacitor and a node of the bidirectional transient suppression diode, the grid electrode of the first MOS tube is connected with a first resistor in series and then connected with a second capacitor and a node of the bidirectional transient suppression diode, and the third capacitor is connected between the grid electrode and the source electrode of the first MOS tube in parallel. The utility model discloses in set up first MOS pipe, third electric capacity and first resistance and constitute and prevent the reverse connection circuit, parasitic diode has one-way conductivity, and under the condition that on-vehicle battery normally connects, parasitic diode forward switches on, and the potential difference between first MOS pipe grid and the source electrode satisfies the conduction condition, and first MOS pipe switches on; when the vehicle-mounted storage battery is reversely connected, the parasitic diode is cut off in a reverse direction, the potential difference between the grid electrode and the source electrode of the first MOS tube does not meet the conduction condition, the first MOS tube is cut off, the parasitic diode is used for realizing current circulation, the third capacitor is a high-frequency capacitor, and high-frequency filtering is realized by using the charge-discharge principle of the high-frequency capacitor; the first resistor is a current-limiting resistor, and the impedance of the first resistor is utilized to limit current, so that the first MOS transistor can be prevented from being broken down, and the stable work can be realized.
In order to further limit the technical scheme of the utility model, the voltage stabilizing circuit comprises a first diode, a second diode and a fourth capacitor, and the first diode is a voltage stabilizing diode; the negative electrode and the positive electrode of the first diode are respectively connected with the source electrode and the grid electrode of the first MOS tube, the negative electrode of the second diode is connected with the positive electrode of the first diode, the first end and the second end of the fourth capacitor are respectively connected with the negative electrode of the first diode and the positive electrode of the second diode, and the positive electrode of the second diode is connected with the grounding end PGND. The utility model is provided with a first diode, a second diode and a fourth capacitor to form a voltage stabilizing circuit, and utilizes the reverse breakdown principle characteristic of the first diode as the voltage stabilizing diode to clamp the input voltage and further inhibit the voltage; the second diode and the first diode realize voltage stabilization by utilizing reverse breakdown characteristics of the second diode; the fourth capacitor is a high-frequency capacitor, and high-frequency filtering is realized by utilizing the charge-discharge principle of the high-frequency capacitor.
To further limit the technical scheme of the utility model, the filter circuit adopts a pi-type filter, and comprises a first inductor, a first electrolytic capacitor and a second electrolytic capacitor, wherein the first inductor is a three-pin inductor; the starting pin of the first inductor is connected with the node of the fourth capacitor and the first diode, the anodes of the first electrolytic capacitor and the second electrolytic capacitor are respectively connected with the starting pin and the ending pin of the first inductor, the cathodes of the first electrolytic capacitor and the second electrolytic capacitor are respectively connected with the node of the fourth capacitor and the node of the second diode, and the common pin of the first inductor is connected with the grounding terminal PGND. The utility model discloses in set up pi type filter that first inductance, first electrolytic capacitor and second electrolytic capacitor constitute as filter circuit, can strain the interference of dead time in the gear motor drive chip under the low temperature condition, prevent to draw low supply voltage, avoid gear motor drive chip dead time to cause the influence to shifting.
It is right to the technical solution of the present invention, the switching circuit includes a second MOS transistor, a triode, a third diode, a second resistor, a third resistor and a fifth capacitor, the second MOS transistor is a P-channel enhancement type with a parasitic diode, the triode is an NPN type, and the third diode is a voltage regulator diode; the first end of the second resistor is connected with a node of the first inductor and the second electrolytic capacitor, the second end of the second resistor is connected with a collector of the triode after being connected with the third resistor in series, a base of the triode is connected with an output end of a power supply control signal of the gear shifting motor in the automobile motor controller, the fifth capacitor is connected between the base and an emitter of the triode in parallel, the emitter of the triode is connected with a node of the second capacitor and the bidirectional transient suppression diode, a negative electrode and a positive electrode of the third diode are respectively connected with the first end and the second end of the second resistor, a source electrode and a grid electrode of the second MOS tube are respectively connected with a negative electrode and a positive electrode of the third diode, and a drain electrode output voltage of the second MOS tube supplies power for the gear shifting motor driving chip. The triode of the utility model is switched on or off according to the power control signal of the gear shifting motor, then the switching on or off of the triode controls the switching on or off of the second MOS tube, and then the switching on or off of the second MOS tube is carried out, thereby switching on or off the power supply voltage of the gear shifting motor driving chip output by the filter circuit; specifically, when an internal circuit of the shift motor is short-circuited, a power supply control signal of the shift motor is a low level signal, the triode is cut, and the second MOS transistor is cut, so that the power supply voltage of the shift motor driving chip output by the filter circuit is cut off; the fifth capacitor is a high-frequency capacitor, and filtering of the power supply control signal of the gear shifting motor is realized by utilizing the charge-discharge principle of the high-frequency capacitor; the second resistor and the third resistor form a voltage division circuit, and the second MOS tube can be stably in a working state.
The utility model has the advantages that: 1) the high-voltage pulse of the external vehicle-mounted storage battery, the damage of a driving circuit caused by the internal circuit fault and the voltage reverse flow of the gear shifting motor and the influence of dead time of a driving chip of the gear shifting motor on gear shifting in a low-temperature environment can be avoided, and the gear shifting motor has the advantage of low cost.
2) The utility model relates to a power supply circuit with protect function can guarantee to shift motor and the safe power supply of the motor drive chip of shifting, prevents to appear the damage of the circuit among the motor drive system of shifting and the condition that the shake of shifting and can't shift, provides the guarantee to whole car safety.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a circuit diagram of the present invention.
Fig. 3 is the load rejection test oscillogram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and fig. 2, a motor driving power supply circuit with a protection function includes a transient suppression circuit 1, an anti-reverse connection circuit 2, a voltage stabilizing circuit 3, a filter circuit 4 and a switch circuit 5, which are connected in sequence;
the transient suppression circuit 1 is used for suppressing high voltage in the vehicle-mounted storage battery;
the reverse connection preventing circuit 2 is used for preventing the voltage output by the transient suppression circuit 1 from flowing reversely;
the voltage stabilizing circuit 3 is used for performing voltage stabilizing processing on the voltage output by the reverse connection preventing circuit 2;
the filter circuit 4 is used for filtering the voltage output by the voltage stabilizing circuit 3;
and the switch circuit 5 is used for switching on or off the power supply voltage of the gear shifting motor driving chip output by the filter circuit 4 according to the gear shifting motor power supply control signal output by the automobile motor controller.
In this embodiment, the transient suppression circuit 1 includes a bidirectional transient suppression diode TVS1, a first capacitor C1 and a second capacitor C2, and both the first capacitor C1 and the second capacitor C2 are high-frequency capacitors; the first capacitor C1 is connected in series with the second capacitor C2 and then connected in parallel with the bidirectional transient suppression diode, the first capacitor is connected with the first end of the bidirectional transient suppression diode, the second capacitor is connected with the second end of the bidirectional transient suppression diode TVS1, and the second end of the bidirectional transient suppression diode TVS1 is connected with the ground terminal PGND.
In this embodiment, the anti-reverse connection circuit 2 includes a first MOS transistor Q1, a third capacitor C3, and a first resistor R1, where the third capacitor C3 is a high-frequency capacitor, and the first MOS transistor Q1 is a P-channel enhancement type with a parasitic diode; the drain of the first MOS transistor Q1 is connected to a node between the first capacitor C1 and the bidirectional transient suppression diode TVS1, the gate of the first MOS transistor Q1 is connected in series with the first resistor R1 and then connected to a node between the second capacitor C2 and the bidirectional transient suppression diode TVS1, and the third capacitor C3 is connected in parallel between the gate and the source of the first MOS transistor Q1.
In this embodiment, the voltage stabilizing circuit 3 includes a first diode D1, a second diode D2, and a fourth capacitor C4, and the first diode D1 is a zener diode; the cathode and the anode of the first diode D1 are connected to the source and the gate of the first MOS transistor, the cathode of the second diode D2 is connected to the anode of the first diode D1, the first end and the second end of the fourth capacitor C4 are connected to the cathode of the first diode D1 and the anode of the second diode D2, and the anode of the second diode D2 is connected to the ground terminal PGND.
In this embodiment, the filter circuit 4 adopts a pi-type filter, and includes a first inductor L1, a first electrolytic capacitor E1, and a second electrolytic capacitor E2, where the first inductor L1 is a three-pin inductor; the starting pin of the first inductor L1 is connected to the node between the fourth capacitor C4 and the first diode D1, the anodes of the first electrolytic capacitor E1 and the second electrolytic capacitor E2 are connected to the starting pin and the ending pin of the first inductor L1, the cathodes of the first electrolytic capacitor E1 and the second electrolytic capacitor E2 are connected to the node between the fourth capacitor C4 and the second diode D2, and the common pin of the first inductor L1 is connected to the ground terminal PGND.
In this embodiment, the switch circuit 5 includes a second MOS transistor Q2, a triode Q3, a third diode D3, a second resistor R2, a third resistor R3, and a fifth capacitor C5, where the second MOS transistor Q2 is a P-channel enhancement type with a parasitic diode, the triode Q3 is an NPN type, and the third diode D3 is a voltage regulator diode; a first end of a second resistor R2 is connected with a node between a first inductor L1 and a second electrolytic capacitor E2, a second end of the second resistor R2 is connected with a third resistor R3 in series and then connected with a collector of a triode Q3, a base of a triode Q3 is connected with an output end of a power supply control signal of a shift motor in an automobile motor controller, a fifth capacitor C5 is connected between a base and an emitter of the triode Q3 in parallel, an emitter of the triode Q3 is connected with a node between the second capacitor C2 and a bidirectional transient suppression diode TVS1, a cathode and an anode of the third diode D3 are connected with a first end and a second end of the second resistor R2, a source and a gate of the second MOS transistor Q2 are connected with a cathode and an anode of the third diode D3, and a drain output voltage of the second MOS transistor Q2 supplies power to a drive chip of the shift motor.
In fig. 1 and 2, the vehicle-mounted storage battery is in positive connection, wherein KL _30 represents the positive electrode connection end of the vehicle-mounted storage battery, KL _30-1 represents the output end of the POWER supply voltage of the gear shifting MOTOR and the gear shifting MOTOR driving chip, MCU _ OUT _ MOTOR _ POWER _ CON represents the POWER supply control signal of the gear shifting MOTOR output by the microprocessor in the vehicle MOTOR controller, and MOTOR _ POWER represents the POWER supply voltage of the gear shifting MOTOR driving chip.
In the embodiment, the substrate and the source of the first MOS transistor Q1 are short-circuited, and the anode and the cathode of the parasitic diode in the first MOS transistor Q1 are respectively connected with the drain and the source of the first MOS transistor Q1; the substrate and the source of the second MOS transistor Q2 are shorted, and the anode and the cathode of the parasitic diode in the second MOS transistor Q2 are respectively connected to the drain and the source of the second MOS transistor Q2.
In this embodiment, the models of the first MOS transistor Q1 and the second MOS transistor Q2 are both mosid D90P03P4L-04, the models of the first capacitor C1 and the second capacitor C2 are both ceramic capacitors of 10nf, the model of the bidirectional transient suppression diode TVS1 is SM8S26CA, the models of the first diode D1 and the second diode D2 of the voltage regulator are both BZT52C18, the model of the triode Q3 is DDTD123YCA, the models of the third capacitor C3 and the fourth capacitor C4 are both ceramic capacitors of 1nf, the model of the fifth capacitor C5 is a ceramic capacitor of 100nf, the models of the first resistor R1 and the third resistor R3 are both 10k Ω, and the model of the second resistor R2 is 100k Ω; the triode Q3 is a pre-biased triode and is an integrated element, the structure of the triode Q3 is shown in a dotted line frame in fig. 2, a fourth resistor R4 and a fifth resistor R5 are arranged in the triode Q3, the fourth resistor R4 is an external resistor of a base electrode, the fifth resistor R5 is connected between the base electrode and an emitter electrode, and the types of the fourth resistor R4 and the fifth resistor R5 are 2.2K omega and 10K omega respectively.
The voltage of the vehicle-mounted storage battery is set to be 12V, and the test is carried out on the embodiment:
1) and (3) testing conditions are as follows: the vehicle-mounted storage battery is positively connected, and the vehicle-mounted storage battery throws load pulse parameters: us =101V, Us =35V, Ri =1 Ω, td =300ms, and the test waveform is as shown in fig. 3, wherein the dotted line is an uninhibited waveform curve, and the solid line is a suppressed waveform curve; and (3) testing results: the MOTOR _ POWER is 11.4V;
2) and (3) testing conditions are as follows: the vehicle-mounted storage battery is reversely connected, and the anode and the cathode of the vehicle-mounted storage battery are respectively connected with the second end and the first end of the bidirectional transient suppression diode TVS 1; and (3) testing results: the MOTOR _ POWER is 0V;
3) the vehicle-mounted storage battery is positively connected, and the ambient temperature is-40 ℃; and (3) testing results: the MOTOR _ POWER is 11.4V;
4) and (3) testing conditions are as follows: the vehicle-mounted storage battery is positively connected, an internal circuit of the gear shifting MOTOR is short-circuited, the MCU _ OUT _ MOTOR _ POWER _ CON is a low level signal, and the voltage value is 0V; and (3) testing results: MOTOR _ POWER is 0V.
Claims (6)
1. A motor drive power supply circuit with a protection function is characterized in that: the anti-reverse-connection circuit comprises a transient suppression circuit (1), an anti-reverse-connection circuit (2), a voltage stabilizing circuit (3), a filter circuit (4) and a switch circuit (5) which are connected in sequence;
the transient suppression circuit (1) is used for suppressing high voltage in the vehicle-mounted storage battery;
the anti-reverse connection circuit (2) is used for preventing the voltage output by the transient suppression circuit (1) from flowing reversely;
the voltage stabilizing circuit (3) is used for stabilizing the voltage output by the anti-reverse-connection circuit (2);
the filter circuit (4) is used for filtering the voltage output by the voltage stabilizing circuit (3);
and the switching circuit (5) is used for switching on or off the power supply voltage of the gear shifting motor driving chip output by the filter circuit (4) according to the gear shifting motor power supply control signal output by the automobile motor controller.
2. A motor drive power supply circuit with a protection function according to claim 1, characterized in that: the transient suppression circuit (1) comprises a bidirectional transient suppression diode, a first capacitor and a second capacitor, wherein the first capacitor and the second capacitor are both high-frequency capacitors; the first capacitor is connected with a first end of the bidirectional transient suppression diode, the second capacitor is connected with a second end of the bidirectional transient suppression diode, and the second end of the bidirectional transient suppression diode is connected with a grounding end PGND.
3. A motor drive power supply circuit with a protection function according to claim 2, characterized in that: the anti-reverse connection circuit (2) comprises a first MOS tube, a third capacitor and a first resistor, wherein the third capacitor is a high-frequency capacitor, and the first MOS tube is a P-channel enhancement type with a parasitic diode; the drain electrode of the first MOS tube is connected with a first capacitor and a node of the bidirectional transient suppression diode, the grid electrode of the first MOS tube is connected with a first resistor in series and then is connected with a second capacitor and a node of the bidirectional transient suppression diode, and the third capacitor is connected between the grid electrode and the source electrode of the first MOS tube in parallel.
4. A motor drive power supply circuit with a protection function according to claim 3, characterized in that: the voltage stabilizing circuit (3) comprises a first diode, a second diode and a fourth capacitor, wherein the first diode is a voltage stabilizing diode; the negative electrode and the positive electrode of the first diode are respectively connected with the source electrode and the grid electrode of the first MOS tube, the negative electrode of the second diode is connected with the positive electrode of the first diode, the first end and the second end of the fourth capacitor are respectively connected with the negative electrode of the first diode and the positive electrode of the second diode, and the positive electrode of the second diode is connected with the grounding end PGND.
5. A motor drive power supply circuit with a protection function according to claim 4, characterized in that: the filter circuit (4) adopts a pi-type filter and comprises a first inductor, a first electrolytic capacitor and a second electrolytic capacitor, wherein the first inductor is a three-pin inductor; the starting pin of the first inductor is connected with the node of the fourth capacitor and the first diode, the anodes of the first electrolytic capacitor and the second electrolytic capacitor are respectively connected with the starting pin and the ending pin of the first inductor, the cathodes of the first electrolytic capacitor and the second electrolytic capacitor are respectively connected with the node of the fourth capacitor and the node of the second diode, and the common pin of the first inductor is connected with the grounding terminal PGND.
6. A motor drive power supply circuit with a protection function according to claim 5, characterized in that: the switch circuit (5) comprises a second MOS tube, a triode, a third diode, a second resistor, a third resistor and a fifth capacitor, the second MOS tube is a P channel enhancement type with a parasitic diode, the triode is an NPN type, and the third diode is a voltage stabilizing diode; the first end of the second resistor is connected with a node of the first inductor and the second electrolytic capacitor, the second end of the second resistor is connected with a collector of the triode after being connected with the third resistor in series, a base of the triode is connected with an output end of a power supply control signal of the gear shifting motor in the automobile motor controller, the fifth capacitor is connected between the base and an emitter of the triode in parallel, the emitter of the triode is connected with a node of the second capacitor and the bidirectional transient suppression diode, a negative electrode and a positive electrode of the third diode are respectively connected with the first end and the second end of the second resistor, a source electrode and a grid electrode of the second MOS tube are respectively connected with a negative electrode and a positive electrode of the third diode, and a drain electrode output voltage of the second MOS tube supplies power for the gear shifting motor driving chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220914680.8U CN217388540U (en) | 2022-04-20 | 2022-04-20 | Motor drive power supply circuit with protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220914680.8U CN217388540U (en) | 2022-04-20 | 2022-04-20 | Motor drive power supply circuit with protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217388540U true CN217388540U (en) | 2022-09-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220914680.8U Active CN217388540U (en) | 2022-04-20 | 2022-04-20 | Motor drive power supply circuit with protection function |
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| Country | Link |
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| CN (1) | CN217388540U (en) |
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2022
- 2022-04-20 CN CN202220914680.8U patent/CN217388540U/en active Active
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