CN212785160U - Low-voltage high-speed motor driver circuit - Google Patents
Low-voltage high-speed motor driver circuit Download PDFInfo
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- CN212785160U CN212785160U CN202021937102.3U CN202021937102U CN212785160U CN 212785160 U CN212785160 U CN 212785160U CN 202021937102 U CN202021937102 U CN 202021937102U CN 212785160 U CN212785160 U CN 212785160U
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Abstract
The utility model discloses a low pressure high speed motor driver circuit, including PWM speed governing circuit, analog voltage speed governing circuit, rotational speed output circuit, speed governing mode switch circuit, intelligent processing module, power management circuit, direction switch circuit, power drive circuit, current sampling circuit, PWM speed governing circuit, analog voltage speed governing circuit, rotational speed output circuit, speed governing mode switch circuit, power management circuit, direction switch circuit, power drive circuit, current sampling circuit all is connected with intelligent processing module electricity, power drive circuit is connected with current sampling circuit electricity, power management circuit and PWM speed governing circuit, analog voltage speed governing circuit, rotational speed output circuit, speed governing mode switch circuit, direction switch circuit, power drive circuit, and the equal electricity of current sampling circuit is connected. The utility model discloses can solve current low pressure high speed motor driver because independent device is too much, lead to being difficult to improve the too big technical problem of integrated level, circuit board volume.
Description
Technical Field
The utility model belongs to the technical field of motor drive, more specifically relates to a low pressure high speed motor driver circuit.
Background
At present, low-voltage high-speed motors are widely applied in the technical fields of communication base stations, electronic product power systems, medical pumps and the like.
The existing low-voltage motor driver mainly comprises two control modes, namely a control mode with a Hall sensor and a control mode without the Hall sensor, along with the development of related control technologies and the continuous improvement of application requirements, the control mode without the Hall sensor gradually becomes the mainstream, and a driver circuit of the low-voltage motor driver generally adopts a framework of a Microprocessor (MCU), a pre-drive unit, a comparator, an intelligent power integrated module or an independent switch device and a plurality of sampling resistors.
However, existing low-voltage high-speed motor drivers generally have some non-negligible disadvantages: firstly, the independent devices of the driver circuit board are too many, so that the integration level is difficult to improve, and the volume of the circuit board is too large; secondly, a power circuit and a control circuit in the driver interfere with each other, so that the safety and stability of the driver are influenced; thirdly, the driver has single function and poor compatibility.
SUMMERY OF THE UTILITY MODEL
To the above defect of prior art or improve the demand, the utility model provides a low pressure high speed motor driver circuit, its aim at, solve current low pressure high speed motor driver because independent device is too much, lead to being difficult to improve the integrated level, the too big technical problem of circuit board volume to and because power circuit and control circuit can take place mutual interference, lead to influencing the technical problem of the safety and stability nature of driver, and driver function singleness, the relatively poor technical problem of compatibility.
To achieve the above object, according to one aspect of the present invention, there is provided a low voltage high speed motor driver circuit, comprising a PWM speed regulation circuit, an analog voltage speed regulation circuit, a rotation speed output circuit, a speed regulation mode switching circuit, an intelligent processing module, a power management circuit, a direction switching circuit, a power driving circuit, and a current sampling circuit, wherein the PWM speed regulation circuit, the analog voltage speed regulation circuit, the rotation speed output circuit, the speed regulation mode switching circuit, the power management circuit, the direction switching circuit, the power driving circuit, and the current sampling circuit are electrically connected to the intelligent processing module, the power driving circuit is electrically connected to the current sampling circuit, the power management circuit is electrically connected with the PWM speed regulation circuit, the analog voltage speed regulation circuit, the rotating speed output circuit, the speed regulation mode switching circuit, the direction switching circuit, the power driving circuit and the current sampling circuit.
Preferably, the low-voltage high-speed motor driver circuit further comprises a serial communication circuit and a voltage sampling circuit, which are respectively electrically connected with the intelligent processing module;
the serial port communication circuit and the voltage sampling circuit are also electrically connected with the power management circuit respectively.
Preferably, the low-voltage high-speed motor driver circuit is arranged on a double-sided PCB, wherein the PWM speed regulation circuit, the analog voltage speed regulation circuit, the rotational speed output circuit, the serial communication circuit, the speed regulation mode switching circuit, the intelligent processing module, and the direction switching circuit are arranged on one side of the PCB, and the power management circuit, the power driving circuit, the current sampling circuit, and the voltage sampling circuit are arranged on the other side of the PCB.
Preferably, the intelligent processing module is a special motor drive chip integrated with an MCU, a comparator unit and a pre-drive unit, and the specific model of the intelligent processing module is FU 6811; the power management circuit is a DC/DC voltage reduction chip or an LDO chip.
Preferably, the direction switching circuit includes a first resistor and a second resistor; one end of the first resistor is connected to a VDD signal end of the power management module, the other end of the first resistor is connected to one end of the second resistor and a DM end of the intelligent processing module, and the other end of the second resistor is connected to a grounding end of the power management module; the speed regulation mode switching circuit comprises a third resistor and a fourth resistor; one end of the third resistor is connected to a VDD signal end of the power management module, the other end of the third resistor is connected to one end of the fourth resistor and an SM end of the intelligent processing module, and the other end of the fourth resistor is connected to a ground end of the power management module.
Preferably, the analog voltage speed regulation circuit comprises a fifth resistor and a first capacitor; one end of the fifth resistor is connected to an external voltage signal, the other end of the fifth resistor is connected to one end of the first capacitor and the VSP end of the intelligent processing module, and the other end of the first capacitor is connected to the grounding end of the power management module; the rotating speed output circuit comprises a sixth resistor, a first triode and a seventh resistor; one end of the sixth resistor is connected to a VDD signal end of the power management module, the other end of the sixth resistor is connected to a collector electrode of the first triode and an external voltage signal, a base electrode of the first triode is connected with one end of the seventh resistor and a grounding end of the power management module respectively, the other end of the seventh resistor is connected to the intelligent processing module, and an emitting electrode of the first triode is grounded.
Preferably, the power driving circuit includes a first switching device, a second switching device, a third switching device, a fourth switching device, a fifth switching device, and a sixth switching device; the first switching device and the second switching device, the third switching device and the fourth switching device, and the fifth switching device and the sixth switching device are respectively connected with each other to form an independent bridge arm; one ends of all the independent bridge arms are connected with each other to form a three-phase H-bridge inverter circuit; the connecting end of the first switching device and the second switching device, the connecting end of the third switching device and the fourth switching device, and the connecting end of the fifth switching device and the sixth switching device are respectively connected to a three-phase winding of the low-voltage high-speed motor.
Preferably, the first switching device, the second switching device and the third switching device are all P-type MOS transistors; the fourth switching device, the fifth switching device and the sixth switching device are all N-type MOS tubes.
Preferably, the current sampling circuit comprises a first sampling resistor and a second sampling resistor; one end of the first sampling resistor is connected with the second switching element, and the other end of the first sampling resistor is connected with the grounding end of the power management module; two ends of the first sampling resistor are respectively connected with a pair of input signals of a comparator unit in the intelligent processing module; one end of the second sampling resistor is connected with the fourth switch device, the other end of the second sampling resistor is connected with the grounding end of the power management module, and two ends of the second sampling resistor are respectively connected with the other pair of input signals of the comparator unit in the intelligent processing module.
Preferably, the first output end of the intelligent processing module is connected with the first switch device, the second output end of the intelligent processing module is connected with the second switch device, the third output end of the intelligent processing module is connected with the third switch device, the fourth output end of the intelligent processing module is connected with the fourth switch device, the fifth output end of the intelligent processing module is connected with the fifth switch device, and the sixth output end of the intelligent processing module is connected with the sixth switch device.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, can gain following beneficial effect:
1. because the utility model integrates the MCU, the comparator unit and the pre-drive unit according to the used intelligent processing module, the technical problems that the integration level is difficult to improve and the circuit board volume is overlarge due to too many independent devices of the existing low-voltage high-speed motor driver can be solved;
2. because the utility model adopts the modularized distributed optimization design, uses the multilayer layout wiring and electrically isolates the control circuit part from the power circuit part, thereby solving the technical problem that the safety and stability of the driver are affected because the power circuit and the control circuit can interfere with each other;
3. because the utility model discloses integrated PWM speed governing circuit, analog voltage speed governing circuit, the scope of the duty cycle of PWM speed governing circuit can reach 5% ~ 98% simultaneously, and analog voltage's speed governing voltage range can reach 0.5V ~ 4.8V, and in addition, increase speed governing mode switching circuit and manage the speed governing mode, consequently can solve current low pressure high-speed motor driver function singleness, compatible relatively poor technical problem.
Drawings
Fig. 1 is a block diagram of the low-voltage high-speed motor driver circuit of the present invention;
fig. 2 is a specific circuit diagram of the control circuit part of the present invention.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
1-PWM speed regulation circuit; 2-analog voltage speed regulation circuit; 3-a rotational speed output circuit; 4-serial communication circuit; 5-speed regulation mode switching circuit; 6-an intelligent processing module; 7-power management circuitry; 8-direction switching circuit; 9-a power driving circuit; 10-a current sampling circuit; 11-voltage sampling circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, the utility model provides a low pressure high speed motor driver circuit, including Pulse Width Modulation (PWM) speed governing circuit 1, analog voltage speed governing circuit 2, rotational speed output circuit 3, serial ports communication circuit 4, speed governing mode switching circuit 5, intelligent processing module 6, power management circuit 7, direction switching circuit 8, power drive circuit 9, current sampling circuit 10 and voltage sampling circuit 11.
It should be noted that the utility model discloses a set up on two-sided Printed circuit board (Printed circuit board, short for PCB), wherein PWM speed governing circuit 1, analog voltage speed governing circuit 2, rotational speed output circuit 3, serial ports communication circuit 4, speed governing mode switching circuit 5, intelligent processing module 6, direction switching circuit 8 set up the one side at the PCB board, and power management circuit 7, power drive circuit 9, current sampling circuit 10, voltage sampling circuit 11 set up the another side at the PCB board.
The PWM speed regulation circuit 1, the analog voltage speed regulation circuit 2, the rotating speed output circuit 3, the serial communication circuit 4, the speed regulation mode switching circuit 5, the power management circuit 7, the direction switching circuit 8, the power driving circuit 9, the current sampling circuit 10 and the voltage sampling circuit 11 are all electrically connected with the intelligent processing module 6.
The power drive circuit 9 is electrically connected to the current sampling circuit 10.
The power management circuit 7 is electrically connected with the PWM speed regulation circuit 1, the analog voltage speed regulation circuit 2, the rotating speed output circuit 3, the serial communication circuit 4, the speed regulation mode switching circuit 5, the direction switching circuit 8, the power driving circuit 9, the current sampling circuit 10 and the voltage sampling circuit 11.
It should be noted that the utility model discloses well PWM speed governing circuit 1 and analog voltage speed governing circuit 2 can coexist, also can only take one of them, if coexist, then select concrete application circuit by speed governing mode switching circuit 5. Serial port communication circuit 4 and voltage sampling circuit 11 are preferred implementation, and it does not exist immediately, the utility model discloses also can normally work.
Fig. 2 is a specific circuit diagram of the control circuit part of the present invention, and it should be noted that fig. 2 illustrates an example of the analog voltage speed regulating circuit 2 as a specific application circuit.
The intelligent processing module 6 is a motor drive dedicated chip integrated with a Micro-controller unit (MCU for short), a comparator unit, and a pre-drive unit, and has a specific model of FU 6811.
The power management circuit 7 is a DC/DC buck chip or a Low dropout regulator (LDO) chip, preferably a DC/DC buck chip, and its specific model is XL 7005A.
The direction switching circuit 8 includes a first resistor R1 and a second resistor R2, wherein one end of the first resistor R1 is connected to the VDD signal terminal of the power management module 7, the other end is connected to one end of the second resistor R2 and a Data Mask (DM) terminal of the intelligent processing module 6, and the other end of the second resistor R2 is connected to the ground terminal GND of the power management module 7.
Specifically, the first resistor R1 and the second resistor R2 are both 0603 packaged chip resistors, wherein the resistance of the first resistor R1 is 10K Ω, and the resistance of the second resistor R2 is 0 Ω.
The speed-adjusting mode switching circuit 5 includes a third resistor R3 and a fourth resistor R4, wherein one end of the third resistor R3 is connected to the VDD Signal terminal of the power management module 7, the other end is connected to one end of the fourth resistor R4 and a Signal Mask (SM) terminal of the intelligent processing module 6, and the other end of the fourth resistor R4 is connected to the ground terminal GND of the power management module 7.
Specifically, the third resistor R3 and the fourth resistor R4 are both 0603 packaged chip resistors, wherein the resistance of the third resistor R3 is 0 Ω, and the resistance of the fourth resistor R4 is 10K Ω.
The analog voltage Speed regulation circuit 2 includes a fifth resistor R5 and a first capacitor C1, wherein one end of the fifth resistor R5 is connected to an external voltage Signal, the other end is connected to one end of the first capacitor C1 and a rotation Speed control Voltage Signal Pin (VSP) of the smart processing module 6, and the other end of the first capacitor C1 is connected to the ground GND of the power management module 7.
Specifically, the fifth resistor R5 and the first capacitor C1 are both 0603 packages, wherein the resistance of the fifth resistor R5 is 10K Ω, and the capacitance of the first capacitor C1 is 0.1 uF.
The rotation speed output circuit 3 comprises a sixth resistor R6, a first triode S1 and a seventh resistor R7, wherein one end of the sixth resistor R6 is connected to the VDD signal end of the power management module 7, the other end of the sixth resistor R6 is connected to the collector of the first triode S1 and the external voltage signal, the base of the first triode S1 is respectively connected with one end of the seventh resistor R7 and the ground end GND of the power management module 7, the other end of the seventh resistor R7 is connected to the intelligent processing module 6, and the emitter of the first triode S1 is grounded.
Specifically, the sixth resistor R6 and the seventh resistor R7 are both 0603 packaged chip resistors, the resistance value of each chip resistor is 20K Ω, and the first transistor S1 is a common transistor, preferably PXHWXYLE.
The power driving circuit 9 includes a first switching device Q1, a second switching device Q2, a third switching device Q3, a fourth switching device Q4, a fifth switching device Q5 and a sixth switching device Q6, the first switching device Q1 and the second switching device Q2, the third switching device Q3 and the fourth switching device Q4, the fifth switching device Q5 and the sixth switching device Q6 are connected with each other to form an independent bridge arm, and one end of each of the 3 independent bridge arms is connected with each other to form a three-phase H-bridge inverter circuit. The connection end U of the first switching device Q1 and the second switching device Q2, the connection end V of the third switching device Q3 and the fourth switching device Q4, and the connection end W of the fifth switching device Q5 and the sixth switching device Q6 are connected to a three-phase winding of the low-voltage high-speed motor.
The switching device is specifically a Metal-Oxide-Semiconductor Field-Effect-Transistor (MOSFET for short) of each power level.
It should be noted that, the utility model discloses well power drive circuit 9's upper bridge arm switching device includes first switching device Q1, second switching device Q2, third switching device Q3, and the three is P type MOS pipe, and specific model is KS430 4304NA, and lower bridge arm switching device includes fourth switching device Q4, fifth switching device Q5, sixth switching device Q6, and it is N type MOS pipe, and specific model is KS4206 NA.
The current sampling circuit 10 includes a first sampling resistor R01 and a second sampling resistor R02, wherein one end of the first sampling resistor R01 is connected to the second switching device Q2, the other end is connected to the ground GND of the power management module 7, and two ends of the first sampling resistor R01 are also connected to the input signal V of the first comparator AMP1 in the intelligent processing module 6 respectivelyU+And VU-One end of the second sampling resistor R02 is connected to the fourth switching device Q4, the other end is connected to the ground GND of the power management module 7, and two ends of the second sampling resistor R02 are also connected to the input signal V of the second comparator AMP2 in the smart processing module 6 respectivelyV+And VV-And (4) connecting.
The current sampling circuit 10 and the power driving circuit 9 are not included or included, and are electrically connected to each other only as shown in fig. 2. The first sampling resistor R01 and the second sampling resistor R02 are 1206-packaged chip resistors, and the resistance values of the chip resistors are 0.05 omega.
The intelligent processing module 6 is connected to the power driving circuit 9, specifically, an output terminal U _ H of the intelligent processing module 6 is connected to the first switching device Q1, an output terminal U _ L is connected to the second switching device Q2, an output terminal V _ H is connected to the third switching device Q3, an output terminal V _ L is connected to the fourth switching device Q4, an output terminal W _ H is connected to the fifth switching device Q5, and an output terminal W _ L is connected to the sixth switching device Q6.
The working principle of the utility model is as follows:
firstly, the operation mode of the motor is determined by adjusting the resistance values of a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4 of a direction switching circuit 8 and a speed regulation mode switching circuit 5, taking an analog voltage speed regulation mode and anticlockwise rotation as examples, at this time, the second resistor R2 and the fourth resistor R4 are both 0 ohm, the first resistor R1 and the third resistor R3 are both 10K ohm, then an external power supply and an external analog voltage speed regulation signal are respectively connected to the analog voltage speed regulation circuit 2 and a power supply management module 7, the power supply management module 7 converts an input power supply into VDD and VCC, and respectively supplies power to the direction switching circuit 8, the speed regulation mode switching circuit 5 and a power driving module 9, a current sampling circuit 10 feeds back the real-time current of the motor to an intelligent processing module 6 through a first sampling resistor R01 and a second sampling resistor R02, the intelligent processing module 6 performs logic control according to the external analog voltage regulation signal and the fed-back real-time current, the motor is enabled to operate normally. Specifically, the real-time current fed back by the current sampling circuit 10 is input into a comparator module of the intelligent processing module 6 for processing, and then enters an MCU module of the intelligent processing module 6, the MCU module calculates the real-time current of the three-phase winding of the motor, the real-time speed of the motor, and the real-time position of the rotor of the motor, and outputs a corresponding PWM signal according to the change of an external analog voltage speed-adjusting signal, the PWM signal drives a pre-drive unit of the intelligent processing module 6, and then controls the on and off of a switching device of the power driving circuit 9, thereby realizing the control of the motor.
In the normal operation process of the motor, the intelligent processing module 6 outputs a rotating speed signal in real time through the rotating speed output circuit 3, and the output form is specifically expressed as a pulse signal.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A low-voltage high-speed motor driver circuit comprises a PWM speed regulation circuit, an analog voltage speed regulation circuit, a rotating speed output circuit, a speed regulation mode switching circuit, an intelligent processing module, a power management circuit, a direction switching circuit, a power driving circuit and a current sampling circuit,
the PWM speed regulation circuit, the analog voltage speed regulation circuit, the rotating speed output circuit, the speed regulation mode switching circuit, the power management circuit, the direction switching circuit, the power driving circuit and the current sampling circuit are all electrically connected with the intelligent processing module;
the power driving circuit is electrically connected with the current sampling circuit;
the power management circuit is electrically connected with the PWM speed regulation circuit, the analog voltage speed regulation circuit, the rotating speed output circuit, the speed regulation mode switching circuit, the direction switching circuit, the power driving circuit and the current sampling circuit.
2. A low-voltage high-speed motor driver circuit according to claim 1,
the low-voltage high-speed motor driver circuit further comprises a serial port communication circuit and a voltage sampling circuit which are respectively and electrically connected with the intelligent processing module;
the serial port communication circuit and the voltage sampling circuit are also electrically connected with the power management circuit respectively.
3. The low-voltage high-speed motor driver circuit according to claim 2, wherein the low-voltage high-speed motor driver circuit is arranged on a double-sided PCB, wherein the PWM speed regulation circuit, the analog voltage speed regulation circuit, the rotating speed output circuit, the serial communication circuit, the speed regulation mode switching circuit, the intelligent processing module and the direction switching circuit are arranged on one side of the PCB, and the power management circuit, the power driving circuit, the current sampling circuit and the voltage sampling circuit are arranged on the other side of the PCB.
4. A low-voltage high-speed motor driver circuit according to claim 3,
the intelligent processing module is a special motor drive chip integrating an MCU, a comparator unit and a pre-drive unit, and the specific model of the intelligent processing module is FU 6811;
the power management circuit is a DC/DC voltage reduction chip or an LDO chip.
5. A low-voltage high-speed motor driver circuit according to claim 4,
the direction switching circuit comprises a first resistor and a second resistor;
one end of the first resistor is connected to a VDD signal end of the power management module, the other end of the first resistor is connected to one end of the second resistor and a DM end of the intelligent processing module, and the other end of the second resistor is connected to a grounding end of the power management module;
the speed regulation mode switching circuit comprises a third resistor and a fourth resistor;
one end of the third resistor is connected to a VDD signal end of the power management module, the other end of the third resistor is connected to one end of the fourth resistor and an SM end of the intelligent processing module, and the other end of the fourth resistor is connected to a ground end of the power management module.
6. A low-voltage high-speed motor driver circuit according to claim 5,
the analog voltage speed regulating circuit comprises a fifth resistor and a first capacitor;
one end of the fifth resistor is connected to an external voltage signal, the other end of the fifth resistor is connected to one end of the first capacitor and the VSP end of the intelligent processing module, and the other end of the first capacitor is connected to the grounding end of the power management module;
the rotating speed output circuit comprises a sixth resistor, a first triode and a seventh resistor;
one end of the sixth resistor is connected to a VDD signal end of the power management module, the other end of the sixth resistor is connected to a collector electrode of the first triode and an external voltage signal, a base electrode of the first triode is connected with one end of the seventh resistor and a grounding end of the power management module respectively, the other end of the seventh resistor is connected to the intelligent processing module, and an emitting electrode of the first triode is grounded.
7. A low-voltage high-speed motor driver circuit according to claim 6,
the power driving circuit comprises a first switching device, a second switching device, a third switching device, a fourth switching device, a fifth switching device and a sixth switching device;
the first switching device and the second switching device, the third switching device and the fourth switching device, and the fifth switching device and the sixth switching device are respectively connected with each other to form an independent bridge arm;
one ends of all the independent bridge arms are connected with each other to form a three-phase H-bridge inverter circuit;
the connecting end of the first switching device and the second switching device, the connecting end of the third switching device and the fourth switching device, and the connecting end of the fifth switching device and the sixth switching device are respectively connected to a three-phase winding of the low-voltage high-speed motor.
8. A low-voltage high-speed motor driver circuit according to claim 7,
the first switching device, the second switching device and the third switching device are all P-type MOS tubes;
the fourth switching device, the fifth switching device and the sixth switching device are all N-type MOS tubes.
9. A low-voltage high-speed motor driver circuit according to claim 8,
the current sampling circuit comprises a first sampling resistor and a second sampling resistor;
one end of the first sampling resistor is connected with the second switching element, and the other end of the first sampling resistor is connected with the grounding end of the power management module;
two ends of the first sampling resistor are respectively connected with a pair of input signals of a comparator unit in the intelligent processing module;
one end of the second sampling resistor is connected with the fourth switch device, the other end of the second sampling resistor is connected with the grounding end of the power management module, and two ends of the second sampling resistor are respectively connected with the other pair of input signals of the comparator unit in the intelligent processing module.
10. A low-voltage high-speed motor driver circuit according to claim 8,
the first output end of the intelligent processing module is connected with the first switch device;
the second output end of the intelligent processing module is connected with the second switching device;
the third output end of the intelligent processing module is connected with the third switching device;
the fourth output end of the intelligent processing module is connected with the fourth switching device;
the fifth output end of the intelligent processing module is connected with the fifth switching device;
and a sixth output end of the intelligent processing module is connected with a sixth switching device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021937102.3U CN212785160U (en) | 2020-09-08 | 2020-09-08 | Low-voltage high-speed motor driver circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021937102.3U CN212785160U (en) | 2020-09-08 | 2020-09-08 | Low-voltage high-speed motor driver circuit |
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| CN212785160U true CN212785160U (en) | 2021-03-23 |
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| CN202021937102.3U Active CN212785160U (en) | 2020-09-08 | 2020-09-08 | Low-voltage high-speed motor driver circuit |
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