Three-phase driving circuit and driving equipment

Abstract

The utility model discloses a three-phase drive circuit and drive equipment, and relates to the technical field of motors, the drive equipment comprises a motor, the motor comprises a first three-phase winding and a second three-phase winding, and the three-phase drive circuit comprises a power supply circuit, a first drive circuit and a first rectification circuit. The first driving circuit comprises a first switching circuit and a second switching circuit, the input end of the first switching circuit is electrically connected with the power supply circuit, the output end of the first switching circuit is electrically connected with the input end of the second switching circuit, and the output end of the first switching circuit is further electrically connected with the first end, the second end and the third end of the first three-phase winding; the first end, the second end and the third end of the second three-phase winding are connected with the first rectifying circuit; the utility model aims to improve the energy utilization rate of the motor.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a three-phase drive circuit and a drive device. Background Art

[0002] The motor is generally driven by the main control to control the conduction of the upper bridge switch and the lower bridge switch, and the polarity of the motor coil is changed by the output voltage. The polarity of the coil interacts with the polarity of the motor rotor, so the motor rotor starts to rotate due to the polarity of the coil.

[0003] However, with the advancement of science and technology, people have higher and higher requirements for energy utilization, while existing motors are generally only used to be driven and do not have a high energy utilization rate. Utility Model Content

[0004] The main purpose of the utility model is to provide a three-phase drive circuit and a drive device, aiming at improving the energy utilization rate of the motor.

[0005] To achieve the above object, the three-phase drive circuit proposed in the utility model is applied to a drive device, wherein the drive device includes a motor, the motor includes a first three-phase winding and a second three-phase winding, and the three-phase drive circuit includes:

[0006] Power supply circuit;

[0007] A first drive circuit, the first drive circuit comprising: a first switch circuit and a second switch circuit, the input end of the first switch circuit is electrically connected to the power supply circuit, the output end of the first switch circuit is electrically connected to the input end of the second switch circuit, the output end of the first switch circuit is also electrically connected to the first end, the second end and the third end of the first three-phase winding, the output end of the second switch circuit is grounded, and the controlled end of the first switch circuit and the controlled end of the second switch circuit are both used to receive a disconnection signal / a conduction signal;

[0008] A first rectifier circuit, a first end, a second end and a third end of the second three-phase winding are all connected to the first rectifier circuit.

[0009] In one embodiment, the power supply circuit comprises:

[0010] A second rectifier circuit, wherein an input end of the second rectifier circuit is connected to an alternating current, and an output end of the second rectifier circuit is electrically connected to an input end of the first drive circuit.

[0011] In one embodiment, the second rectifier circuit includes:

[0012] A first diode, a second diode, a third diode, a fourth diode, a fifth diode and a sixth diode, wherein the anode of the first diode is electrically connected to the cathode of the fourth diode, the anode of the second diode is electrically connected to the cathode of the fifth diode, the anode of the third diode is electrically connected to the cathode of the sixth diode, the anodes of the fourth diode, the fifth diode and the sixth diode are all grounded, and the cathodes of the first diode, the second diode and the third diode are all electrically connected to the input end of the first drive circuit.

[0013] In one embodiment, the first switch circuit includes:

[0014] a second switch tube, a third switch tube and a fourth switch tube, wherein the input end of the second switch tube is electrically connected to the output end of the power circuit, the input end of the second switch tube, the input end of the third switch tube and the input end of the fourth switch tube are all electrically connected to the output end of the power circuit, and the output end of the second switch tube, the output end of the third switch tube and the output end of the fourth switch tube are electrically connected one by one to the first end, the second end and the third end of the first three-phase winding respectively;

[0015] The second switch circuit comprises:

[0016] a fifth switch tube, a sixth switch tube and a seventh switch tube, wherein the input end of the fifth switch tube is electrically connected to the output end of the second switch tube, the input end of the sixth switch tube is electrically connected to the output end of the third switch tube, the input end of the seventh switch tube is electrically connected to the output end of the fourth switch tube, and the output ends of the fifth switch tube, the sixth switch tube and the seventh switch tube are all grounded;

[0017] The controlled end of the second switch tube, the controlled end of the third switch tube, the controlled end of the fourth switch tube, the controlled end of the fifth switch tube and the controlled end of the sixth switch tube are all used to receive corresponding on-signals / off-signals.

[0018] In one embodiment, the three-phase drive circuit further includes:

[0019] A third switch circuit, wherein the input end of the third switch circuit is electrically connected to the input end of the second switch tube, the input end of the third switch tube and the input end of the fourth switch tube respectively, the output end of the third switch circuit is grounded, and the controlled end of the third switch circuit is used to receive a disconnection signal / a conduction signal.

[0020] In one implementation, the third switch circuit includes:

[0021] A first switch tube, a seventh diode and a current limiting resistor circuit, wherein the cathode of the seventh diode is electrically connected to the input end of the second switch tube, the input end of the third switch tube and the input end of the fourth switch tube respectively, the anode of the seventh diode is electrically connected to the first end of the current limiting resistor circuit, the second end of the current limiting resistor circuit is electrically connected to the input end of the first switch tube, the output end of the first switch tube is grounded, and the controlled end of the first switch tube is used to receive a disconnection signal / a conduction signal.

[0022] In one embodiment, the three-phase drive circuit further includes:

[0023] A second drive circuit, wherein the input end of the second drive circuit is electrically connected to the output end of the power supply circuit, and the first end, the second end and the third end of the second three-phase winding are all electrically connected to the output end of the second drive circuit.

[0024] The utility model also provides a driving device, comprising a motor and any one of the above three-phase driving circuits.

[0025] In this embodiment, the technical solution of the utility model includes a motor, a power supply circuit, a first drive circuit and a first rectifier circuit. The motor includes a first three-phase winding and a second three-phase winding. The first drive circuit includes a first switch circuit and a second switch circuit. The first switch circuit and the second switch circuit transmit the current output by the power supply circuit to the first end, the second end or the third end of the first three-phase winding in the form of three-phase electricity by receiving a disconnection signal / a conduction signal, so that the first three-phase winding generates a rotating magnetic field. The rotating magnetic field interacts with the rotor of the motor to rotate the motor. When the motor rotates, the second three-phase winding also rotates. The rotating second three-phase winding continuously cuts the rotating magnetic field generated by the first three-phase winding, so that the second three-phase winding generates an induced electromotive force. Since the second three-phase winding is electrically connected to the first rectifier circuit, the current generated by the second three-phase winding is rectified by the first rectifier circuit to output corresponding direct current, which can be used to charge the battery. In this arrangement, the first three-phase winding generates a magnetic field through current to drive the motor to rotate, while the second three-phase winding converts mechanical energy into electrical energy through electromagnetic induction to generate electricity, which not only improves the energy utilization efficiency, but also makes the motor have a more flexible control strategy and higher reliability. In practical applications, the three-phase drive circuit of the utility model can be used in an elevator system. While the first three-phase winding drives the motor to rotate and drive the elevator to rise, the second three-phase winding charges the battery through the first rectifier circuit to achieve energy recovery and reuse; it can also be used in hybrid vehicles or electric vehicles. While the first three-phase winding drives the motor to drive the wheels to rotate, the second three-phase winding charges the battery through the first rectifier circuit, thereby improving the energy utilization efficiency and increasing the cruising range. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0027] Figure 1 A module schematic diagram of an embodiment of a three-phase drive circuit and a drive device provided by the utility model;

[0028] Figure 2 A schematic diagram of the circuit structure of another embodiment of the three-phase drive circuit and drive device provided by the utility model;

[0029] Figure 3 The present invention provides a three-phase drive circuit and a drive device according to another embodiment of the present invention.

[0030] Description of Figure Numbers:

[0031] 10. Motor; 11. First three-phase winding; 12. Second three-phase winding;

[0032] 20. Power supply circuit; 21. Second rectifier circuit; 30. First drive circuit; 31. First switch circuit; 32. Second switch circuit; 40. First rectifier circuit; 50. Third switch circuit; 60. Second drive circuit.

[0033] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0037] The motor is generally driven by the main control to control the conduction of the upper bridge switch and the lower bridge switch, and the polarity of the motor coil is changed by the output voltage. The polarity of the coil interacts with the polarity of the motor rotor, so the motor rotor starts to rotate due to the polarity of the coil.

[0038] However, with the advancement of science and technology, people have higher and higher requirements for energy utilization, while existing motors are generally only used to be driven and do not have a high energy utilization rate.

[0039] To this end, the utility model proposes a three-phase drive circuit and a drive device, aiming to improve the energy utilization rate of the motor.

[0040] refer to Figure 1 In one embodiment of the utility model, a three-phase drive circuit is applied to a drive device, the drive device includes a motor 10, the motor 10 includes a first three-phase winding 11 and a second three-phase winding 12, and the three-phase drive circuit includes:

[0041] Power supply circuit 20;

[0042] A first drive circuit 30, the first drive circuit 30 comprises: a first switch circuit 31 and a second switch circuit 32, the input end of the first switch circuit 31 is electrically connected to the power circuit 20, the output end of the first switch circuit 31 is electrically connected to the input end of the second switch circuit 32, the output end of the first switch circuit 31 is also electrically connected to the first end, the second end and the third end of the first three-phase winding 11, the output end of the second switch circuit 32 is grounded, and the controlled end of the first switch circuit 31 and the controlled end of the second switch circuit 32 are both used to receive a disconnection signal / a conduction signal;

[0043] The first rectifier circuit 40 , the first end, the second end and the third end of the second three-phase winding 12 are all connected to the input end of the first rectifier circuit 40 .

[0044] In this embodiment, the first switching circuit 31 includes three switching tubes, and the second switching circuit 32 includes three switching tubes. By controlling the on / off of the switching tubes, the current output by the power supply circuit 20 forms three-phase electricity, and the three-phase electricity is transmitted to the first three-phase winding 11 so that the first three-phase winding 11 generates a rotating magnetic field.

[0045] In this embodiment, specifically, the technical solution of the utility model includes a motor 10, a power supply circuit 20, a first drive circuit 30 and a first rectifier circuit 40, the motor 10 includes a first three-phase winding 11 and a second three-phase winding 12, the first drive circuit 30 includes a first switch circuit 31 and a second switch circuit 32, the first switch circuit 31 and the second switch circuit 32 transmit the current output by the power supply circuit 20 in the form of three-phase electricity to the first end, the second end or the third end of the first three-phase winding 11 by receiving a disconnection signal / a conduction signal, so that the first three-phase winding 11 is connected to the first three-phase winding 11. A three-phase winding 11 generates a rotating magnetic field, which interacts with the rotor of the motor 10 to rotate the motor 10. When the motor 10 rotates, the second three-phase winding 12 also rotates. The rotating second three-phase winding 12 continuously cuts the rotating magnetic field generated by the first three-phase winding 11, so that the second three-phase winding 12 generates an induced electromotive force. Since the second three-phase winding 12 is electrically connected to the first rectifier circuit 40, the current generated by the second three-phase winding 12 is rectified by the first rectifier circuit 40 and outputs a corresponding direct current, which can charge the battery. In this way, the first three-phase winding 11 generates a magnetic field through current to drive the motor 10 to rotate, and the second three-phase winding 12 converts mechanical energy into electrical energy through electromagnetic induction to generate electricity, which not only improves the energy utilization efficiency, but also makes the motor 10 have a more flexible control strategy and higher reliability. In practical applications, the three-phase drive circuit of the utility model can be applied in an elevator system. When the first three-phase winding 11 drives the motor 10 to rotate and drive the elevator to rise, the second three-phase winding 12 charges the battery through the first rectifier circuit 40 to achieve energy recovery and reuse. It can also be applied in hybrid vehicles or electric vehicles. When the first three-phase winding 11 drives the motor 10 to rotate and drive the wheels, the second three-phase winding 12 charges the battery through the first rectifier circuit 40, thereby improving energy utilization efficiency and increasing cruising range.

[0046] refer to Figure 2 In one embodiment of the present utility model, the power supply circuit 20 includes:

[0047] The second rectifier circuit 21 has an input terminal connected to an alternating current, and an output terminal of the second rectifier circuit 21 is electrically connected to an input terminal of the first drive circuit 30 .

[0048] In this embodiment, the second rectifier circuit 21 can adopt a three-phase rectifier circuit or a bridge rectifier circuit to rectify the alternating current to output direct current, thereby providing a direct current power supply for driving the motor 10. With such a configuration, in practical applications, for example, in an elevator system, the user can directly connect the mains power in the building to the second rectifier circuit 21 to ensure that the elevator motor 10 is continuously and stably supplied with power.

[0049] In this embodiment, the second rectifier circuit 21 includes:

[0050] A first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5 and a sixth diode D6, wherein the anode of the first diode D1 is electrically connected to the cathode of the fourth diode D4, the anode of the second diode D2 is electrically connected to the cathode of the fifth diode D5, the anode of the third diode D3 is electrically connected to the cathode of the sixth diode D6, the anode of the fourth diode D4, the anode of the fifth diode D5 and the anode of the sixth diode D6 are all grounded, and the cathode of the first diode D1, the cathode of the second diode D2 and the cathode of the third diode D3 are all electrically connected to the input end of the first drive circuit 30.

[0051] In this embodiment, the second rectifier circuit 21 adopts a three-phase rectifier circuit, which is connected to the three-phase power output from the outside to make its output voltage more stable. For the motor 10, the stable voltage input can ensure the smoothness and reliability of the operation of the motor 10, and reduce the failure or performance degradation of the motor 10 caused by voltage fluctuations.

[0052] In this embodiment, the first rectifier circuit 40 and the second rectifier circuit 21 have the same structure and are both three-phase rectifier circuits, so that the three-phase electricity generated by the second three-phase winding 12 is rectified by the first rectifier circuit 40 to form direct current, and charge the battery, thereby improving energy utilization.

[0053] refer to Figure 3 In one embodiment of the present utility model, the first switch circuit 31 includes:

[0054] a second switch tube Q2, a third switch tube Q3 and a fourth switch tube Q4, wherein the input end of the second switch tube Q2 is electrically connected to the output end of the power circuit 20, the input end of the second switch tube Q2, the input end of the third switch tube Q3 and the input end of the fourth switch tube Q4 are all electrically connected to the output end of the power circuit 20, and the output end of the second switch tube Q2, the output end of the third switch tube Q3 and the output end of the fourth switch tube Q4 are electrically connected to the first end, the second end and the third end of the first three-phase winding 11 respectively;

[0055] The second switch circuit 32 includes:

[0056] a fifth switch tube Q5, a sixth switch tube Q6 and a seventh switch tube Q7, wherein the input end of the fifth switch tube Q5 is electrically connected to the output end of the second switch tube Q2, the input end of the sixth switch tube Q6 is electrically connected to the output end of the third switch tube Q3, the input end of the seventh switch tube Q7 is electrically connected to the output end of the fourth switch tube Q4, and the output ends of the fifth switch tube Q5, the sixth switch tube Q6 and the seventh switch tube Q7 are all grounded;

[0057] The controlled ends of the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5 and the sixth switch tube Q6 are all used to receive corresponding on / off signals.

[0058] In this embodiment, the second switch tube Q2 , the third switch tube Q3 , the fourth switch tube Q4 , the fifth switch tube Q5 , the sixth switch tube Q6 and the seventh switch tube Q7 are all NMOS tubes.

[0059] In this embodiment, when the three-phase drive circuit of the utility model is working, any one of the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 is turned on, and the other switch tubes are turned off, so that the current of the power supply circuit 20 is output to one end of the first three-phase winding 11 through the turned-on switch tube, and any one of the fifth switch tube Q5, the sixth switch tube Q6 and the seventh switch tube Q7 is turned on, and the other switch tubes are turned off, so that the current of the first three-phase winding 11 is transmitted to the ground through the turned-on switch tube. In this way, by controlling the on / off of multiple switch tubes, the first drive circuit 30 outputs the current output by the power supply circuit 20 to the first three-phase winding 11 in the form of three-phase electricity, so that the first three-phase winding 11 generates a rotating magnetic field, and the rotating magnetic field interacts with the rotor of the motor 10 to rotate the motor 10.

[0060] refer to Figure 2 In one embodiment of the present utility model, the three-phase drive circuit further includes:

[0061] The third switch circuit 50, the input end of the third switch circuit 50 is electrically connected to the input end of the second switch tube Q2, the input end of the third switch tube Q3 and the input end of the fourth switch tube Q4 respectively, the output end of the third switch circuit 50 is grounded, and the controlled end of the third switch circuit 50 is used to receive a disconnection signal / a conduction signal.

[0062] In this embodiment, if the utility model is applied to a vehicle such as an electric vehicle, when the user brakes, the power supply circuit 20 stops or reduces the output current, the first switch circuit 31 and the second switch circuit 32 are both turned off, and the third switch circuit 50 is turned on. However, due to inertia, the vehicle is still moving and the motor 10 is still rotating. Although the power supply circuit 20 stops or reduces the output current, the magnetic field in the motor 10 does not disappear immediately. Due to inertia, the first three-phase winding 11 of the motor 10 continuously cuts the magnetic field during the rotation process, so that the first three-phase winding 11 generates an induced electromotive force and outputs corresponding three-phase electricity. The switch tube Q2, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5, the sixth switch tube Q6 and the seventh switch tube Q7 are all MOS tubes. When they are all turned off, due to the presence of the MOS tube body diode, the first drive circuit 30 becomes a three-phase rectifier circuit. The current generated by the first three-phase winding 11 is rectified by the three-phase rectifier circuit and then outputs direct current to the third switch circuit 50. The third switch circuit 50 can adopt a circuit composed of a switch tube and a current limiting resistor, so that the direct current is converted into heat energy after passing through the current limiting resistor and is dissipated. This configuration can avoid the current generated during braking from causing certain damage to the motor 10.

[0063] In this embodiment, the third switch circuit 50 includes:

[0064] a first switch tube Q1, a seventh diode D7 and a current limiting resistor circuit, wherein the cathode of the seventh diode D7 is electrically connected to the input end of the second switch tube Q2, the input end of the third switch tube Q3 and the input end of the fourth switch tube Q4 respectively, the anode of the seventh diode D7 is electrically connected to the first end of the current limiting resistor circuit, the second end of the current limiting resistor circuit is electrically connected to the input end of the first switch tube Q1, the output end of the first switch tube Q1 is grounded, and the controlled end of the first switch tube Q1 is used to receive a disconnection signal / a conduction signal.

[0065] In this embodiment, the first switch tube Q1 is an NMOS tube, the seventh diode D7 is a voltage-stabilizing diode, and the current-limiting resistor circuit includes at least one current-limiting resistor. When the vehicle used in the utility model, such as an electric vehicle, is running normally, the first switch tube Q1 is disconnected to prevent the current output by the power supply circuit 20 from flowing to the ground through the first switch tube Q1; when the driver starts to brake, the first switch tube Q1 is turned on, and when the voltage rectified by the first drive circuit 30 reaches the conduction threshold of the seventh diode D7, the seventh diode D7 is turned on, so that the current generated by the motor 10 can flow to the current-limiting resistor circuit and dissipate in the form of heat energy, thereby preventing the current generated during the braking process from causing certain damage to the motor 10.

[0066] refer to Figure 3 In one embodiment of the present utility model, the three-phase drive circuit further includes:

[0067] The second drive circuit 60 , the input end of the second drive circuit 60 is electrically connected to the output end of the power supply circuit 20 , and the first end, the second end and the third end of the second three-phase winding 12 are all electrically connected to the output end of the second drive circuit 60 .

[0068] In this embodiment, the second drive circuit 60 has the same structure as the first drive circuit 30 and has the same effect. The second drive circuit 60 outputs the current output by the power supply circuit 20 to the second three-phase winding 12 in the form of three-phase electricity, so that the first three-phase winding 11 and the second three-phase winding 12 drive the corresponding rotor to rotate. With this arrangement, the simultaneous driving of the two windings can generate a stronger electromagnetic force, thereby improving the output power and efficiency of the motor 10. When the two windings work at the same time, the magnetic fields they generate are superimposed on each other to form a stronger rotating magnetic field, so that the motor 10 can output greater torque and power. This helps the motor 10 maintain stable performance when running under heavy load or at high speed, and improves overall work efficiency.

[0069] The utility model also provides a driving device, including a motor 10 and the three-phase driving circuit as described above.

[0070] It is worth noting that since the drive device of the present invention is based on the above-mentioned three-phase drive circuit, the embodiments of the drive device of the present invention include all technical solutions of all embodiments of the above-mentioned three-phase drive circuit, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0071] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A three-phase drive circuit, applied to a drive device, wherein the drive device includes a motor, characterized in that: The motor includes a first three-phase winding and a second three-phase winding, and the three-phase drive circuit includes: Power supply circuit; A first drive circuit, the first drive circuit comprising: a first switch circuit and a second switch circuit, the input end of the first switch circuit is electrically connected to the power supply circuit, the output end of the first switch circuit is electrically connected to the input end of the second switch circuit, the output end of the first switch circuit is also electrically connected to the first end, the second end and the third end of the first three-phase winding, the output end of the second switch circuit is grounded, and the controlled end of the first switch circuit and the controlled end of the second switch circuit are both used to receive a disconnection signal / a conduction signal; A first rectifier circuit, a first end, a second end and a third end of the second three-phase winding are all connected to the first rectifier circuit.

2. The three-phase drive circuit according to claim 1, characterized in that: The power supply circuit comprises: A second rectifier circuit, wherein an input end of the second rectifier circuit is connected to an alternating current, and an output end of the second rectifier circuit is electrically connected to an input end of the first drive circuit.

3. The three-phase drive circuit according to claim 2, characterized in that: The second rectifier circuit comprises: A first diode, a second diode, a third diode, a fourth diode, a fifth diode and a sixth diode, wherein the anode of the first diode is electrically connected to the cathode of the fourth diode, the anode of the second diode is electrically connected to the cathode of the fifth diode, the anode of the third diode is electrically connected to the cathode of the sixth diode, the anodes of the fourth diode, the fifth diode and the sixth diode are all grounded, and the cathodes of the first diode, the second diode and the third diode are all electrically connected to the input end of the first drive circuit.

4. The three-phase drive circuit according to claim 1, characterized in that: The first switch circuit comprises: a second switch tube, a third switch tube and a fourth switch tube, wherein the input end of the second switch tube is electrically connected to the output end of the power circuit, the input end of the second switch tube, the input end of the third switch tube and the input end of the fourth switch tube are all electrically connected to the output end of the power circuit, and the output end of the second switch tube, the output end of the third switch tube and the output end of the fourth switch tube are electrically connected one by one to the first end, the second end and the third end of the first three-phase winding respectively; The second switch circuit comprises: a fifth switch tube, a sixth switch tube and a seventh switch tube, wherein the input end of the fifth switch tube is electrically connected to the output end of the second switch tube, the input end of the sixth switch tube is electrically connected to the output end of the third switch tube, the input end of the seventh switch tube is electrically connected to the output end of the fourth switch tube, and the output ends of the fifth switch tube, the sixth switch tube and the seventh switch tube are all grounded; The controlled end of the second switch tube, the controlled end of the third switch tube, the controlled end of the fourth switch tube, the controlled end of the fifth switch tube and the controlled end of the sixth switch tube are all used to receive corresponding on-signals / off-signals.

5. The three-phase drive circuit according to claim 4, characterized in that: The three-phase drive circuit also includes: A third switch circuit, wherein the input end of the third switch circuit is electrically connected to the input end of the second switch tube, the input end of the third switch tube and the input end of the fourth switch tube respectively, the output end of the third switch circuit is grounded, and the controlled end of the third switch circuit is used to receive a disconnection signal / a conduction signal.

6. The three-phase drive circuit according to claim 5, characterized in that: The third switch circuit comprises: A first switch tube, a seventh diode and a current limiting resistor circuit, wherein the cathode of the seventh diode is electrically connected to the input end of the second switch tube, the input end of the third switch tube and the input end of the fourth switch tube respectively, the anode of the seventh diode is electrically connected to the first end of the current limiting resistor circuit, the second end of the current limiting resistor circuit is electrically connected to the input end of the first switch tube, the output end of the first switch tube is grounded, and the controlled end of the first switch tube is used to receive a disconnection signal / a conduction signal.

7. The three-phase drive circuit according to claim 1, characterized in that: The three-phase drive circuit also includes: A second drive circuit, wherein the input end of the second drive circuit is electrically connected to the output end of the power supply circuit, and the first end, the second end and the third end of the second three-phase winding are all electrically connected to the output end of the second drive circuit.

8. A driving device, characterized in that: The invention comprises a motor and a three-phase drive circuit as claimed in any one of claims 1 to 7.

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