CN115549447B

CN115549447B - Auxiliary power circuit suitable for driver

Info

Publication number: CN115549447B
Application number: CN202211526925.0A
Authority: CN
Inventors: 龚耀京; 杨运海; 张荣亮; 马蕾
Original assignee: Shenzhen Farwide Electric Co ltd
Current assignee: Shenzhen Farwide Electric Co ltd
Priority date: 2022-12-01
Filing date: 2022-12-01
Publication date: 2023-06-02
Anticipated expiration: 2042-12-01
Also published as: CN115549447A

Abstract

The invention discloses an auxiliary power circuit suitable for a driver, comprising: flyback control circuit and multi-channel flyback output transformer; the multi-channel flyback output transformer comprises a primary side first winding, a primary side second winding, a primary side output circuit, a secondary side winding set and a secondary side output circuit set; the primary side output circuit is connected with the primary side second winding, the secondary side winding set comprises at least one secondary side winding, the secondary side output circuit set comprises at least one secondary side output circuit, and the at least one secondary side output circuit is correspondingly connected with the at least one secondary side winding respectively; one end of the primary side first winding is coupled with a low-voltage power supply, and the other end of the primary side first winding is coupled with a flyback control circuit, so that the multipath flyback output transformer outputs at least two auxiliary power supplies through a primary side output circuit and a secondary side output circuit set. The invention can provide the auxiliary power supply with low voltage power supply, can avoid the problem of misoperation and failure caused by high voltage power supply on the driver, and can reduce the production cost.

Description

Auxiliary power circuit suitable for driver

Technical Field

The invention relates to the technical field of drivers, in particular to an auxiliary power supply circuit suitable for a driver.

Background

At present, with the continuous progress of electronic technology, drivers (mainly including electrical devices employing power electronics technologies, such as frequency converters, servo drivers, inverters, motor speed regulators, etc.) are widely used. In the application of the driver, when the driver is directly powered by high voltage, there may be a problem of malfunction, and when powered by high voltage, a high voltage device is required, which increases production cost.

Disclosure of Invention

In order to solve the technical problems, the invention provides an auxiliary power supply circuit suitable for a driver, which can provide an auxiliary power supply with low voltage power supply, can avoid the problem of misoperation and failure caused by high voltage power supply on the driver, and can reduce the production cost.

The invention proposes an auxiliary power supply circuit suitable for a driver, comprising: flyback control circuit and multi-channel flyback output transformer; the multi-channel flyback output transformer comprises a primary side first winding, a primary side second winding, a primary side output circuit, a secondary side winding set and a secondary side output circuit set; the primary side output circuit is connected with the primary side second winding, the secondary side winding set comprises at least one secondary side winding, the at least one secondary side winding is coupled with the primary side first winding and the primary side second winding, the secondary side output circuit set comprises at least one secondary side output circuit, and the at least one secondary side output circuit is correspondingly connected with the at least one secondary side winding respectively.

One end of the primary side first winding is coupled with a low-voltage power supply, and the other end of the primary side first winding is coupled with the flyback control circuit, so that the multipath flyback output transformer outputs at least two auxiliary power supplies through the primary side output circuit and the secondary side output circuit set.

Further, any one auxiliary power supply of the at least two auxiliary power supplies is connected with a forward control circuit, and the forward control circuit is connected with a forward transformer set; the forward voltage transformer set comprises at least one forward voltage transformer, and the forward voltage transformer is used for outputting an IGBT driving power supply.

Further, the primary side output circuit comprises a first diode, a second diode, a first electrolytic capacitor and a first capacitor.

The positive pole of the first diode and the positive pole of the second diode are connected with the same-name end of the primary side second winding, the negative pole of the first diode and the negative pole of the second diode are connected with the positive pole of the first electrolytic capacitor and the first end of the first capacitor, and the negative pole of the first electrolytic capacitor, the second end of the first capacitor and the different-name end of the primary side second winding are grounded.

The node connecting the cathode of the first diode, the cathode of the second diode, the anode of the first electrolytic capacitor and the first end of the first capacitor is used as the output end of the primary side output circuit so as to output a first auxiliary power supply.

Further, the at least one secondary side output circuit includes a first secondary side output circuit including a third diode, a fourth diode, a second electrolytic capacitor, a third electrolytic capacitor, a second capacitor, a third capacitor, and a first resistor.

The positive pole of the third diode is connected with the corresponding homonymous end of the first secondary winding, the negative pole of the third diode is connected with the positive pole of the second electrolytic capacitor and the first end of the second capacitor, the negative pole of the second electrolytic capacitor, the second end of the second capacitor, the positive pole of the third electrolytic capacitor and the first end of the third capacitor are connected with the corresponding homonymous end of the first secondary winding, the negative pole of the third electrolytic capacitor, the second end of the third capacitor and the second end of the first resistor are connected with the positive pole of the fourth diode, and the negative pole of the fourth diode is connected with the corresponding homonymous end of the second secondary winding.

The node connecting the cathode of the third diode, the anode of the second electrolytic capacitor and the first end of the second capacitor is used as a first output end of the first secondary side output circuit so as to output a second auxiliary power supply; and a node connecting the anode of the fourth diode, the cathode of the third electrolytic capacitor, the second end of the third capacitor and the second end of the first resistor is used as a second output end of the first secondary side output circuit so as to output a third auxiliary power supply.

Further, the at least one secondary side output circuit further comprises a second secondary side output circuit, wherein the second secondary side output circuit comprises a fifth diode, a first inductor, a fourth electrolytic capacitor and a fourth capacitor.

The negative electrode of the fifth diode is connected with the corresponding synonym end of the secondary winding, the positive electrode of the fifth diode is connected with the first end of the first inductor, the second end of the first inductor is connected with the negative electrode of the fourth electrolytic capacitor and the second end of the fourth capacitor, and the corresponding synonym end of the secondary winding, the positive electrode of the fourth electrolytic capacitor and the first end of the fourth capacitor are grounded.

And a node connecting the second end of the first inductor, the negative electrode of the fourth electrolytic capacitor and the second end of the fourth capacitor is used as an output end of the second secondary output circuit so as to output a fourth auxiliary power supply.

Further, the at least one secondary side output circuit further includes a third secondary side output circuit including a sixth diode, a fifth electrolytic capacitor, a fifth capacitor, and a second resistor.

The positive electrode of the sixth diode is connected with one end of the corresponding secondary winding, the negative electrode of the sixth diode is connected with the positive electrode of the fifth electrolytic capacitor, the first end of the fifth capacitor and the first end of the second resistor, and the negative electrode of the fifth electrolytic capacitor, the second end of the fifth capacitor and the second end of the second resistor are connected with the other end of the corresponding secondary winding.

And a node connecting the negative electrode of the sixth diode, the positive electrode of the fifth electrolytic capacitor, the first end of the fifth capacitor and the first end of the second resistor is used as an output end of the third secondary side output circuit so as to output a fifth auxiliary power supply.

Further, the forward control circuit includes a timer chip, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a sixth electrolytic capacitor, a seventh electrolytic capacitor, an eighth electrolytic capacitor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a first field effect transistor, and a second field effect transistor.

The first end of the sixth capacitor, the positive electrode of the sixth electrolytic capacitor, the first end of the third resistor, the VCC pin of the timer chip and the RESET pin of the timer chip are connected with the first auxiliary power supply, the second end of the third resistor is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the first end of the fifth resistor, the second end of the fifth resistor is connected with the first end of the seventh capacitor, the THOLD pin of the timer chip, the TRIG pin of the timer chip and the first end of the sixth resistor, the second end of the seventh capacitor is grounded with the GND pin of the timer chip, the OUT pin of the timer chip is connected with the second end of the sixth resistor, the first end of the seventh resistor and the first end of the tenth resistor, the second end of the seventh resistor is connected with the first end of the eighth capacitor, the second end of the eighth capacitor is connected with the second end of the eighth resistor and the grid electrode of the first field effect tube, the second end of the tenth resistor is connected with the first end of the ninth capacitor, the second end of the ninth capacitor is connected with the first end of the eleventh resistor and the grid electrode of the second field effect tube, the drain electrode of the second field effect tube is connected with the drain electrode of the first field effect tube, the source electrode of the first field effect tube, the first end of the eighth resistor, the positive electrode of the seventh electrolytic capacitor, the first end of the twelfth capacitor and the first end of the ninth resistor are connected with the first auxiliary power supply, the negative electrode of the seventh electrolytic capacitor is connected with the second end of the tenth capacitor, the second end of the eleventh capacitor, the positive electrode of the eighth electrolytic capacitor, the second end of the twelfth capacitor, the third electrode of the eighth electrolytic capacitor, the second end of the ninth resistor, the first end of the thirteenth capacitor and the first end of the twelfth resistor are connected, the first end of the tenth capacitor is connected with the first end of the eleventh capacitor, the second end of the eleventh resistor, the source electrode of the second field effect transistor, the negative electrode of the eighth electrolytic capacitor, the second end of the thirteenth capacitor and the second end of the twelfth resistor are grounded.

The node connecting the drain electrode of the second field effect transistor and the drain electrode of the first field effect transistor is used as a first output end of the forward control circuit, and the node connecting the first end of the tenth capacitor and the first end of the eleventh capacitor is used as a second output end of the forward control circuit.

Further, the forward transformer set comprises a first forward transformer, and the first forward transformer comprises a primary input first winding, a primary first winding, a secondary second winding, a first W-phase upper bridge driving power supply circuit, a first U-phase upper bridge driving power supply circuit and a first V-phase upper bridge driving power supply circuit.

The same name end of the primary side input first winding is connected with the first output end of the forward control circuit, and the different name end of the primary side input first winding is connected with the second output end of the forward control circuit.

The first W-phase upper bridge driving power supply circuit comprises a ninth electrolytic capacitor, a tenth electrolytic capacitor, a seventh diode, an eighth diode, a ninth diode and a fourteenth capacitor, wherein the second end of the fourteenth capacitor and the negative electrode of the ninth diode are connected with the same-name end of the primary first winding, the first end of the fourteenth capacitor is connected with the positive electrode of the seventh diode and the negative electrode of the eighth diode, the negative electrode of the seventh diode is connected with the positive electrode of the ninth electrolytic capacitor, the positive electrode of the eighth diode is connected with the negative electrode of the ninth electrolytic capacitor, the positive electrode of the tenth electrolytic capacitor is connected with the different-name end of the primary first winding, and the negative electrode of the tenth electrolytic capacitor is connected with the positive electrode of the ninth diode.

The first U-phase upper bridge driving power supply circuit comprises a fifteenth capacitor, a twelfth pole tube, an eleventh diode, a twelfth diode, an eleventh electrolytic capacitor and a twelfth electrolytic capacitor; the first end of the fifteenth capacitor and the negative electrode of the twelfth diode are connected with the same-name end of the secondary first winding, the second end of the fifteenth capacitor is connected with the negative electrode of the twelfth diode and the positive electrode of the eleventh diode, the positive electrode of the twelfth diode, the negative electrode of the eleventh electrolytic capacitor and the positive electrode of the twelfth electrolytic capacitor are connected with the different-name end of the secondary first winding, the negative electrode of the eleventh diode is connected with the positive electrode of the eleventh electrolytic capacitor, and the positive electrode of the twelfth diode is connected with the negative electrode of the twelfth electrolytic capacitor.

The first V-phase upper bridge driving power supply circuit comprises a sixteenth capacitor, a thirteenth diode, a fourteenth diode, a fifteenth diode, a thirteenth electrolytic capacitor and a fourteenth electrolytic capacitor; the first end of the sixteenth capacitor and the negative electrode of the fifteenth diode are connected with the same-name end of the secondary second winding, the second end of the sixteenth capacitor is connected with the negative electrode of the thirteenth diode and the positive electrode of the fourteenth diode, the positive electrode of the thirteenth diode, the negative electrode of the thirteenth electrolytic capacitor and the positive electrode of the fourteenth electrolytic capacitor are connected with the different-name end of the secondary second winding, the negative electrode of the fourteenth diode is connected with the positive electrode of the thirteenth electrolytic capacitor, and the positive electrode of the fifteenth diode is connected with the negative electrode of the fourteenth electrolytic capacitor.

Further, the forward transformer set further comprises a second forward transformer, and the second forward transformer comprises a primary input second winding, a primary second winding, a secondary third winding, a secondary fourth winding, a second W-phase upper bridge driving power supply circuit, a second U-phase upper bridge driving power supply circuit and a second V-phase upper bridge driving power supply circuit.

The same name end of the primary side input second winding is connected with the first output end of the forward control circuit, and the different name end of the primary side input second winding is connected with the second output end of the forward control circuit.

The second W-phase upper bridge driving power supply circuit comprises a fifteenth electrolytic capacitor, a sixteenth diode, a seventeenth diode, an eighteenth diode and a seventeenth capacitor, wherein the second end of the seventeenth capacitor and the negative electrode of the eighteenth diode are connected with the same-name end of the primary second winding, the first end of the seventeenth capacitor is connected with the positive electrode of the sixteenth diode and the negative electrode of the seventeenth diode, the negative electrode of the sixteenth diode is connected with the positive electrode of the fifteenth electrolytic capacitor, the positive electrode of the seventeenth diode is connected with the negative electrode of the fifteenth electrolytic capacitor, the positive electrode of the sixteenth electrolytic capacitor and the different-name end of the primary second winding, and the negative electrode of the sixteenth electrolytic capacitor is connected with the positive electrode of the eighteenth diode.

The second U-phase upper bridge driving power supply circuit comprises an eighteenth capacitor, a nineteenth diode, a twentieth diode, a seventeenth electrolytic capacitor and an eighteenth electrolytic capacitor; the first end of the eighteenth capacitor and the negative electrode of the twenty-second diode are connected with the same-name end of the secondary third winding, the second end of the eighteenth capacitor is connected with the negative electrode of the nineteenth diode and the positive electrode of the twentieth diode, the positive electrode of the nineteenth diode, the negative electrode of the seventeenth electrolytic capacitor and the positive electrode of the eighteenth electrolytic capacitor are connected with the different-name end of the secondary third winding, the negative electrode of the twentieth diode is connected with the positive electrode of the seventeenth electrolytic capacitor, and the positive electrode of the twenty-second diode is connected with the negative electrode of the eighteenth electrolytic capacitor.

The second V-phase upper bridge driving power supply circuit comprises a nineteenth capacitor, a twenty-second diode, a twenty-third diode, a twenty-fourth diode, a nineteenth electrolytic capacitor and a twentieth electrolytic capacitor; the first end of the nineteenth capacitor and the negative electrode of the twenty-fourth diode are connected with the same-name end of the secondary fourth winding, the second end of the nineteenth capacitor is connected with the negative electrode of the twenty-second diode and the positive electrode of the twenty-third diode, the positive electrode of the twenty-second diode, the negative electrode of the nineteenth electrolytic capacitor and the positive electrode of the twentieth electrolytic capacitor are connected with the different-name end of the secondary fourth winding, the negative electrode of the twenty-third diode is connected with the positive electrode of the nineteenth electrolytic capacitor, and the positive electrode of the twenty-fourth diode is connected with the negative electrode of the twentieth electrolytic capacitor.

Further, the set of forward transformers further includes a third forward transformer and a fourth forward transformer.

The third forward transformer comprises a primary input third winding, a primary third winding, a secondary fifth winding, a secondary sixth winding, a third W-phase upper bridge driving power supply circuit, a third U-phase upper bridge driving power supply circuit and a third V-phase upper bridge driving power supply circuit.

The same name end of the primary side input third winding is connected with the first output end of the forward control circuit, and the different name end of the primary side input third winding is connected with the second output end of the forward control circuit.

The third W-phase upper bridge driving power supply circuit comprises a twenty-first electrolytic capacitor, a twenty-second electrolytic capacitor, a twenty-fifth diode, a twenty-sixth diode, a twenty-seventh diode and a twenty-seventh capacitor, wherein the second end of the twenty-seventh capacitor and the negative electrode of the twenty-seventh diode are connected with the same-name end of the primary third winding, the first end of the twenty-fifth capacitor is connected with the positive electrode of the twenty-fifth diode and the negative electrode of the twenty-sixth diode, the negative electrode of the twenty-fifth diode is connected with the positive electrode of the twenty-first electrolytic capacitor, the positive electrode of the twenty-sixth diode is connected with the negative electrode of the twenty-first electrolytic capacitor, the positive electrode of the twenty-second electrolytic capacitor and the different-name end of the primary third winding, and the negative electrode of the twenty-second electrolytic capacitor is connected with the positive electrode of the twenty-seventh diode.

The third U-phase upper bridge driving power supply circuit comprises a twenty-first capacitor, a twenty-eighth diode, a twenty-ninth diode, a thirty-third diode, a twenty-third electrolytic capacitor and a twenty-fourth electrolytic capacitor; the first end of the twenty-first capacitor and the negative electrode of the thirty-first diode are connected with the same-name end of the secondary fifth winding, the second end of the twenty-first capacitor is connected with the negative electrode of the twenty-eighth diode and the positive electrode of the twenty-ninth diode, the positive electrode of the twenty-eighth diode, the negative electrode of the twenty-third electrolytic capacitor and the positive electrode of the twenty-fourth electrolytic capacitor are connected with the different-name end of the secondary fifth winding, the negative electrode of the twenty-ninth diode is connected with the positive electrode of the twenty-third electrolytic capacitor, and the positive electrode of the thirty-fourth electrolytic capacitor is connected with the negative electrode of the thirty-fourth electrolytic capacitor.

The third V-phase upper bridge driving power supply circuit comprises a twenty-second capacitor, a thirty-second diode, a thirty-third diode, a twenty-fifth electrolytic capacitor and a twenty-sixth electrolytic capacitor; the first end of the twenty-second capacitor and the negative electrode of the thirty-third diode are connected with the same-name end of the secondary sixth winding, the second end of the twenty-second capacitor is connected with the negative electrode of the first thirty-second diode and the positive electrode of the thirty-second diode, the positive electrode of the first thirty-second diode, the negative electrode of the twenty-fifth electrolytic capacitor and the positive electrode of the twenty-sixth electrolytic capacitor are connected with the different-name end of the secondary sixth winding, the negative electrode of the thirty-second diode is connected with the positive electrode of the twenty-fifth electrolytic capacitor, and the positive electrode of the thirty-third diode is connected with the negative electrode of the twenty-sixth electrolytic capacitor.

The fourth forward transformer comprises a primary input fourth winding, a primary fourth winding, a secondary seventh winding, a secondary eighth winding, a fourth W-phase upper bridge driving power supply circuit, a fourth U-phase upper bridge driving power supply circuit and a fourth V-phase upper bridge driving power supply circuit.

The same name end of the primary side input fourth winding is connected with the first output end of the forward control circuit, and the different name end of the primary side input fourth winding is connected with the second output end of the forward control circuit.

The fourth W-phase upper bridge driving power supply circuit comprises a twenty-seventh electrolytic capacitor, a twenty-eighth electrolytic capacitor, a thirty-fourth diode, a thirty-fifth diode, a thirty-sixth diode and a twenty-third capacitor, wherein the second end of the twenty-third capacitor and the negative electrode of the thirty-sixth diode are connected with the same name end of the primary fourth winding, the first end of the twenty-third capacitor is connected with the positive electrode of the thirty-fourth diode and the negative electrode of the thirty-fifth diode, the negative electrode of the thirty-fourth diode is connected with the positive electrode of the twenty-seventh electrolytic capacitor, the positive electrode of the thirty-fifth diode is connected with the negative electrode of the twenty-seventh electrolytic capacitor, the positive electrode of the twenty-eighth electrolytic capacitor and the different name end of the primary fourth winding, and the negative electrode of the twenty-eighth electrolytic capacitor is connected with the positive electrode of the thirty-sixth diode.

The fourth U-phase upper bridge driving power supply circuit comprises a twenty-fourth capacitor, a thirty-seventh diode, a thirty-eighth diode, a thirty-ninth diode, a twenty-ninth electrolytic capacitor and a thirty-eighth electrolytic capacitor; the first end of the twenty-fourth capacitor and the negative electrode of the thirty-ninth diode are connected with the same-name end of the secondary seventh winding, the second end of the twenty-fourth capacitor is connected with the negative electrode of the thirty-seventh diode and the positive electrode of the thirty-eighth diode, the positive electrode of the thirty-seventh diode, the negative electrode of the twenty-ninth electrolytic capacitor and the positive electrode of the thirty-seventh electrolytic capacitor are connected with the different-name end of the secondary seventh winding, the negative electrode of the thirty-eighth diode is connected with the positive electrode of the twenty-ninth electrolytic capacitor, and the positive electrode of the thirty-ninth diode is connected with the negative electrode of the thirty-eighth electrolytic capacitor.

The fourth V-phase upper bridge driving power supply circuit comprises a twenty-fifth capacitor, a forty diode, a forty-second diode, a thirty-first electrolytic capacitor and a thirty-second electrolytic capacitor; the first end of the twenty-fifth capacitor and the negative electrode of the fortieth second diode are connected with the same-name end of the secondary eighth winding, the second end of the twenty-fifth capacitor is connected with the negative electrode of the fortieth diode and the positive electrode of the fortieth diode, the negative electrode of the thirty-first electrolytic capacitor and the positive electrode of the thirty-second electrolytic capacitor are connected with the different-name end of the secondary eighth winding, the negative electrode of the fortieth diode is connected with the positive electrode of the thirty-first electrolytic capacitor, and the positive electrode of the fortieth second diode is connected with the negative electrode of the thirty-second electrolytic capacitor.

Compared with the prior art, the invention discloses an auxiliary power circuit suitable for a driver, which comprises: flyback control circuit and multi-channel flyback output transformer; the multi-channel flyback output transformer comprises a primary side first winding, a primary side second winding, a primary side output circuit, a secondary side winding set and a secondary side output circuit set; the primary side output circuit is connected with the primary side second winding, the secondary side winding set comprises at least one secondary side winding, the secondary side output circuit set comprises at least one secondary side output circuit, and the at least one secondary side output circuit is correspondingly connected with the at least one secondary side winding respectively; one end of the primary side first winding is coupled with a low-voltage power supply, and the other end of the primary side first winding is coupled with a flyback control circuit, so that the multipath flyback output transformer outputs at least two auxiliary power supplies through a primary side output circuit and a secondary side output circuit set. The invention can provide the auxiliary power supply with low voltage power supply, can avoid the problem of misoperation and failure caused by high voltage power supply on the driver, and can reduce the production cost.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of an auxiliary power circuit suitable for a driver according to an embodiment of the present invention;

FIG. 2 is a circuit diagram of an auxiliary power circuit for a driver according to an embodiment of the present invention;

fig. 3 is a circuit diagram of a forward control circuit according to an embodiment of the present invention;

fig. 4 is a circuit diagram of a first forward transformer, a second forward transformer, a third forward transformer, and a fourth forward transformer according to an embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

Any resistor or capacitor mentioned in the embodiment of the invention is a first end of a resistor, a capacitor or an inductor and a second end of a resistor or a capacitor in sequence from left to right if the resistor or the capacitor is horizontally arranged in the circuit diagram; the resistor, capacitor or inductor, if arranged perpendicular to the horizontal direction in the circuit diagram, is a first end of the resistor, capacitor or inductor and a second end of the resistor, capacitor or inductor in that order from top to bottom.

Referring to fig. 1 to 4, fig. 1 is a schematic structural diagram of an auxiliary power circuit suitable for a driver according to an embodiment of the present invention; FIG. 2 is a circuit diagram of an auxiliary power circuit for a driver according to an embodiment of the present invention; fig. 3 is a circuit diagram of a forward control circuit according to an embodiment of the present invention; fig. 4 is a circuit diagram of a first forward transformer, a second forward transformer, a third forward transformer, and a fourth forward transformer according to an embodiment of the present invention. The auxiliary power supply circuit suitable for the driver is applied to the driver and provides different auxiliary power supplies for the driver.

The invention provides an auxiliary power circuit suitable for a driver, comprising: a flyback control circuit 1 and a multi-channel flyback output transformer T1; the multi-channel flyback output transformer T1 comprises a primary side first winding N1, a primary side second winding N2, a primary side output circuit V1, a secondary side winding set Nx and a secondary side output circuit set Vx; the primary side output circuit V1 is connected with the primary side second winding N2, the secondary side winding set Nx includes at least one secondary side winding, the at least one secondary side winding is coupled with the primary side first winding N1 and the primary side second winding N2, the secondary side output circuit set Vx includes at least one secondary side output circuit, and the at least one secondary side output circuit is correspondingly connected with the at least one secondary side winding respectively; one end of the primary side first winding N1 is coupled with a low-voltage power supply, and the other end of the primary side first winding N1 is coupled with the flyback control circuit 1, so that the multipath flyback output transformer T1 outputs at least two auxiliary power supplies through the primary side output circuit V1 and the secondary side output circuit set Vx.

In this embodiment, referring to fig. 1 and 2, the multi-channel flyback output transformer T1 is powered by a low-voltage power supply, preferably a 24V power supply. The primary side first winding N1 of the multi-channel flyback output transformer T1 is coupled with a low-voltage power supply and the flyback control circuit 1, and a primary side feedback mode is adopted, so that the multi-channel flyback output transformer T1 can output at least two auxiliary power supplies through a primary side output circuit V1 and a secondary side output circuit set Vx. The flyback control circuit 1 can provide a voltage stabilizing function, and the flyback control circuit 1 can enable the multi-channel flyback output transformer T1 to stably output an auxiliary power supply. And, the primary side second winding N2 in the multi-channel flyback output transformer T1 is connected with the primary side output circuit V1 to generate an auxiliary power supply, at least one secondary side winding and the corresponding secondary side output circuit can generate at least one auxiliary power supply, and the generated auxiliary power supply can supply power for the flyback control circuit 1 and can also supply power for other devices in the circuit. The invention can provide the auxiliary power supply with low voltage power supply, can avoid the problem of misoperation and failure caused by high voltage power supply on the driver, and meanwhile, the low voltage power supply can omit the original high-voltage device used in the high voltage power supply, can reduce the production cost and the volume, and is beneficial to fault maintenance.

In a more specific embodiment, any one of the at least two auxiliary power supplies is connected to a forward control circuit 2, the forward control circuit 2 being connected to a forward transformer set Tx; the forward transformer set Tx comprises at least one forward transformer, and the forward transformer is used for outputting an IGBT driving power supply.

In the present embodiment, referring to fig. 1 to 4, one of the plurality of auxiliary power supplies output by the flyback output transformer T1 is used as an excitation source of each forward transformer in the forward transformer set Tx to generate a plurality of IGBT driving power supplies. The forward control circuit 2 is configured to generate a PWM control square wave, and use the PWM control square wave as a drive of a forward transformer, so that an excitation source can generate a plurality of IGBT driving power sources through the forward control circuit 2 and the forward transformers in the forward transformer set Tx. Each IGBT driving power supply comprises a U-phase upper bridge driving power supply of the IGBT, a V-phase upper bridge driving power supply of the IGBT and a W-phase upper bridge driving power supply of the IGBT. And moreover, a plurality of IGBT driving power supplies are mutually independent, so that when one IGBT driving power supply fails, the whole drive cannot be unavailable, and meanwhile, the redundant design of the drive can be ensured.

In a more specific embodiment, the primary side output circuit V1 includes a first diode D1, a second diode D2, a first electrolytic capacitor E1, and a first capacitor C1.

The positive pole of the first diode D1 and the positive pole of the second diode D2 are connected with the same-name end of the primary side second winding N2, the negative pole of the first diode D1 and the negative pole of the second diode D2 are connected with the positive pole of the first electrolytic capacitor E1 and the first end of the first capacitor C1, and the negative pole of the first electrolytic capacitor E1, the second end of the first capacitor C1 and the different-name end of the primary side second winding N2 are grounded.

The node connecting the cathode of the first diode D1, the cathode of the second diode D2, the anode of the first electrolytic capacitor E1, and the first end of the first capacitor C1 is used as an output end of the primary side output circuit V1, so as to output a first auxiliary power supply.

In this embodiment, referring to fig. 2, the primary side output circuit V1 may output +15v power according to the parameter settings of different components in the primary side output circuit V1, i.e. the first auxiliary power may be +15v power. For example, the first electrolytic capacitor E1 is 220uF/35V, the first capacitor C1 is 104 capacitor, and the output end of the primary side output circuit V1 can provide +15V power supply. The +15v power supply can supply power to the flyback control circuit 1 and can also supply power to other devices in the circuit. The +15v power supply supplies power to the forward control circuit 2, and the forward control circuit serves as an excitation source of a forward transformer to output a multi-channel IGBT driving power supply.

Further, the flyback control circuit 1 comprises a switching power supply chip U1 and peripheral circuits. Specifically, referring to fig. 2, the peripheral circuit includes a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-sixth capacitor C26, a twenty-seventh capacitor C27, a twenty-eighth capacitor C28, a twenty-ninth capacitor C29, a thirty-eighth capacitor C30, and a third field-effect transistor M3.

The COMP pin of the switching power supply chip U1 is connected to the second end of the seventeenth resistor R17, the first end of the seventeenth resistor R17 is connected to the second end of the twenty-sixth capacitor C26, the first end of the twenty-sixth capacitor C26, the INV pin of the switching power supply chip U1 and the first end of the fourteenth resistor R14 are connected to the second end of the thirteenth resistor R13, the first end of the thirteenth resistor R13 is connected to the first auxiliary power supply, the second end of the fourteenth resistor R14 is grounded, the CT/RT pin of the switching power supply chip U1 is connected to the first end of the twenty-seventh capacitor C27 and the second end of the sixteenth resistor R16, the second end of the twenty-seventh capacitor C27 is grounded, the first end of the sixteenth resistor R16 is connected to the second end of the fifteenth resistor R15, the first end of the fifteenth resistor R15 is connected to the first end of the twenty-eighth capacitor C28, the first end of the switching power supply chip R13 is connected to the second end of the thirteenth resistor R1, the CT/RT pin of the nineteenth resistor R1 is connected to the first end of the twenty-eighth resistor R19, the nineteenth resistor R19 is connected to the first end of the nineteenth resistor R19, the nineteenth resistor R19 is connected to the nineteenth end of the nineteenth resistor R1, the nineteenth resistor R19 is connected to the nineteenth end of the power supply winding, and the nineteenth resistor R19 is connected to the nineteenth end of the nineteenth resistor R1, and the nineteenth resistor R18 is connected to the eighth resistor R, the first end of the twenty-first resistor R21 is connected with the first end of the twenty-second resistor R22, the first end of the twenty-first resistor R20 is connected with the CS pin of the switching power supply chip U1 and the first end of the thirty-second capacitor C30, and the second end of the thirty-second capacitor C30, the second end of the twenty-first resistor R21, the second end of the twenty-second resistor R22 and the GND pin of the switching power supply chip U1 are grounded.

In this embodiment, referring to fig. 2, the flyback control circuit 1 can make the primary side output circuit V1 stably output power, and can generate PWM control square waves for each forward transformer in the forward control circuit 2 and the forward transformer set Tx. The thirteenth resistor R13 and the fourteenth resistor R14 form a primary voltage dividing circuit, a reference voltage is provided for the INV pin (i.e., 2 pins) of the switching power supply chip U1, and the primary output circuit V1 can accurately output the first auxiliary power supply based on the reference voltage of the INV pin of the switching power supply chip U1. The model of the switching power supply chip U1 may adopt UC2844BD1R2G, and the first auxiliary power supply is a +15v power supply, and then the resistance values of the thirteenth resistor R13 and the fourteenth resistor R14 are respectively 15kΩ and 3kΩ, so that 2.5V reference voltage is provided for the INV pin of the switching power supply chip U1, and the +15v power supply may supply power to the switching power supply chip U1, and may also supply power to other devices in the circuit, and satisfies the output requirement of 15V/0.3A. Meanwhile, the oscillating resistor-capacitor is composed of a fifteenth resistor R15, a sixteenth resistor R16 and a twenty-seventh capacitor C27, the frequency is output through an OUT pin (namely 6 pins) of the switching power supply chip U1, and the peak current can be limited within the required current through a third field effect transistor M3, an eighteenth resistor R18, a twenty-first resistor R21 and a twenty-second resistor R22. For example, the fifteenth resistor R15 and the sixteenth resistor R16 have resistances of 15kΩ and 1kΩ, respectively, the twenty-seventh capacitor C27 uses 102 capacitors, the oscillation frequency is 107KHZ, the output frequency through the OUT pin (i.e., 6 pins) of the switching power supply chip U1 is 54 KHZ, the third fet M3 uses IRFR014TRLPBF (60V/4.9A) switching transistors, the eighteenth resistor R18 has resistances of 22 Ω, and the twenty-first resistor R21 and the twenty-second resistor R22 have resistances of 0.25 Ω and 0.25 Ω, respectively, so that the peak current can be limited to 8A to ensure that the output can be started with load.

Further, the primary side first winding N1 of the multi-channel flyback output transformer T1 is coupled to a low-voltage power supply, and the low-voltage power supply supplies power to the multi-channel flyback output transformer T1. Specifically, referring to fig. 2, the low voltage power supply may use a 24V power supply, and the auxiliary power circuit suitable for the driver provided in this embodiment includes a thirty-third electrolytic capacitor E33, a thirty-first capacitor C31, a thirty-second capacitor C32, a thirty-third capacitor C33, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a forty-third diode D43, a forty-fourth diode D44, a forty-fifth diode D45, and a forty-sixth diode D46. The 24V power supply is connected to the positive electrode of the forty-fifth diode D45 and the positive electrode of the forty-sixth diode D46, the negative electrode of the forty-fifth diode D45 and the negative electrode of the forty-sixth diode D46 are connected to the positive electrode of the thirty-third electrolytic capacitor E33, the first end of the thirty-third capacitor C33, the first end of the twenty-third resistor R23, the first end of the twenty-fourth resistor R24, the first end of the thirty-second capacitor C32 and the differential end of the primary winding N1, the negative electrode of the thirty-third electrolytic capacitor E33 and the second end of the thirty-third capacitor C33 are grounded, the first end of the twenty-third resistor R23 and the negative electrode of the forty-third capacitor C31 are connected to the VCC pin of the switching power supply chip U1, the second end of the thirty-first capacitor C31 is grounded, the first end of the thirty-third diode D43 and the fourth end of the forty-third resistor D25 are connected to the positive electrode of the forty-third diode D33 and the second end of the forty-third resistor C25.

In a more specific embodiment, the at least one secondary side output circuit includes a first secondary side output circuit including a third diode D3, a fourth diode D4, a second electrolytic capacitor E2, a third electrolytic capacitor E3, a second capacitor C2, a third capacitor C3, and a first resistor R1.

The positive electrode of the third diode D3 is connected with the corresponding homonymous end of the first secondary winding N3, the negative electrode of the third diode D3 is connected with the positive electrode of the second electrolytic capacitor E2 and the first end of the second capacitor C2, the negative electrode of the second electrolytic capacitor E2, the second end of the second capacitor C2, the positive electrode of the third electrolytic capacitor E3, the first end of the third capacitor C3 and the first end of the first resistor R1 are connected with the corresponding homonymous end of the first secondary winding N3, the negative electrode of the third electrolytic capacitor E3, the second end of the third capacitor C3 and the second end of the first resistor R1 are connected with the positive electrode of the fourth diode D4, and the negative electrode of the fourth diode D4 is connected with the corresponding homonymous end of the second secondary winding N4.

The node connecting the cathode of the third diode D3, the anode of the second electrolytic capacitor E2 and the first end of the second capacitor C2 is used as a first output end of the first secondary output circuit to output a second auxiliary power supply; and a node connecting the anode of the fourth diode D4, the cathode of the third electrolytic capacitor E3, the second end of the third capacitor C3 and the second end of the first resistor R1 is used as a second output end of the first secondary side output circuit so as to output a third auxiliary power supply.

In this embodiment, referring to fig. 2, the first secondary side output circuit may output vb+ power and VB-power according to parameter settings of different elements in the first secondary side output circuit. For example, the second electrolytic capacitor E2 is 100uF/25V, the third electrolytic capacitor E3 is 100uF/25V, the second capacitor C2 and the third capacitor C3 are 104 capacitors, the first resistor R1 is 186.8kΩ, the first output terminal of the first secondary side output circuit may provide vb+ power, the second output terminal of the first secondary side output circuit may provide VB-power, that is, the second auxiliary power is vb+ power, and the third auxiliary power is VB-power. The VB+ power supply can be obtained by the voltage stabilizing tube, so that a positive power supply is provided for the lower bridge driving of the IGBT in the driver, and a negative power supply is provided for the lower bridge driving of the IGBT by the VB-power supply.

In a more specific embodiment, the at least one secondary side output circuit further comprises a second secondary side output circuit comprising a fifth diode D5, a first inductance L1, a fourth electrolytic capacitor E4 and a fourth capacitor C4.

The negative pole of the fifth diode D5 is connected with the corresponding synonym end of the secondary winding N5, the positive pole of the fifth diode D5 is connected with the first end of the first inductor L1, the second end of the first inductor L1 is connected with the negative pole of the fourth electrolytic capacitor E4 and the second end of the fourth capacitor C4, and the corresponding synonym end of the secondary winding N5, the positive pole of the fourth electrolytic capacitor E4 and the first end of the fourth capacitor C4 are grounded.

The node connecting the second end of the first inductor L1, the negative electrode of the fourth electrolytic capacitor E4, and the second end of the fourth capacitor C4 is used as an output end of the second secondary output circuit, so as to output a fourth auxiliary power supply.

In this embodiment, referring to fig. 2, the fourth auxiliary power supply may be a-15V power supply according to the parameter settings of different elements in the second secondary output circuit. For example, in the present example, the first inductance L1 is 4.7uH/3A, the fourth electrolytic capacitor E4 is 100uF/25V, and the fourth capacitor C4 is 104 capacitor, and the second secondary output circuit may provide-15V power.

In a more specific embodiment, the at least one secondary side output circuit further comprises a third secondary side output circuit comprising a sixth diode D6, a fifth electrolytic capacitor E5, a fifth capacitor C5 and a second resistor R2.

The positive electrode of the sixth diode D6 is connected to one end of the corresponding secondary winding N6, the negative electrode of the sixth diode D6 is connected to the positive electrode of the fifth electrolytic capacitor E5, the first end of the fifth capacitor C5, and the first end of the second resistor R2, and the negative electrode of the fifth electrolytic capacitor E5, the second end of the fifth capacitor C5, and the second end of the second resistor R2 are connected to the other end of the corresponding secondary winding N6.

The node connecting the negative electrode of the sixth diode D6, the positive electrode of the fifth electrolytic capacitor E5, the first end of the fifth capacitor C5, and the first end of the second resistor R2 is used as the output end of the third secondary output circuit, so as to output a fifth auxiliary power supply.

In this embodiment, referring to fig. 2, the secondary winding N6 connected to the third secondary output circuit is a fly-wire winding of the multi-path flyback output transformer T1, and a D24V power supply can be output according to parameter settings of different elements in the third secondary output circuit. For example, the fifth electrolytic capacitor E5 is 220uF/35V, the fifth capacitor C5 is 104 capacitor, the second resistor R2 is 10KΩ, and the third secondary side output circuit can provide D24V power. Wherein the D24V power supply may provide isolated power for the I/O port of the drive.

In a more specific embodiment, the forward control circuit 2 includes a timer chip U2, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a sixth electrolytic capacitor E6, a seventh electrolytic capacitor E7, an eighth electrolytic capacitor E8, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a first fet M1, and a second fet M2.

The first end of the sixth capacitor C6, the positive electrode of the sixth electrolytic capacitor E6, the first end of the third resistor R3, the VCC pin of the timer chip U2 and the RESET pin of the timer chip U2 are connected with the first auxiliary power supply, the second end of the third resistor R3 is connected with the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected with the first end of the fifth resistor R5, the second end of the fifth resistor R5 is connected with the first end of the seventh capacitor C7, the THOLD pin of the timer chip U2, the TRIG pin of the timer chip U2 and the first end of the sixth resistor R6, the second end of the seventh capacitor C7 is grounded with the GND pin of the timer chip U2, the OUT pin of the timer chip U2 is connected with the second end of the sixth resistor R6, the first end of the seventh resistor R7 and the tenth resistor R10, the second end of the seventh resistor R7 is connected to the first end of the eighth capacitor C8, the second end of the eighth capacitor C8 is connected to the second end of the eighth resistor R8 and the gate of the first fet M1, the second end of the tenth resistor R10 is connected to the first end of the ninth capacitor C9, the second end of the ninth capacitor C9 is connected to the first end of the eleventh resistor R11 and the gate of the second fet M2, the drain of the second fet M2 is connected to the drain of the first fet M1, the source of the first fet M1, the first end of the eighth resistor R8, the positive electrode of the seventh electrolytic capacitor E7, the first end of the twelfth capacitor C12 and the first end of the ninth resistor R9 are connected to the first auxiliary power supply, the negative electrode of the seventh electrolytic capacitor E7 is connected to the second end of the tenth capacitor C10, the second end of the eleventh capacitor C11, the positive electrode of the eighth electrolytic capacitor E8, the second end of the twelfth capacitor C12, the second end of the ninth resistor R9, the first end of the thirteenth capacitor C13, and the first end of the twelfth resistor R12 are connected, the first end of the tenth capacitor C10 is connected to the first end of the eleventh capacitor C11, the second end of the eleventh resistor R11, the source electrode of the second field effect transistor M2, the negative electrode of the eighth electrolytic capacitor E8, the second end of the thirteenth capacitor C13, and the second end of the twelfth resistor R12 are grounded.

The node connecting the drain of the second fet M2 and the drain of the first fet M1 is used as the first output terminal a of the forward control circuit 2, and the node connecting the first end of the tenth capacitor C10 and the first end of the eleventh capacitor C11 is used as the second output terminal B of the forward control circuit 2.

In this embodiment, referring to fig. 3, the first output terminal a and the second output terminal B of the forward control circuit 2 are respectively connected to two ends of the primary input winding of each forward transformer in the forward transformer set Tx, and the voltages of the first output terminal a and the second output terminal B of the forward control circuit 2 can be balanced on the required variable square wave pulse. For example, the timer chip U2 may be MC1455BDR2G, and based on the timer chip U2, PWM with fixed frequency and duty ratio can be generated to drive the forward power supply, the oscillating resistor is composed of a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a seventh capacitor C7, when the third resistor R3 is 51KΩ, the fourth resistor R4 is 22KΩ, the fifth resistor R5 is 12KΩ, the seventh capacitor C7 is 102 capacitor, square wave with oscillating frequency of 120KHZ, output duty ratio of 50% and amplitude of 15V is generated, the OUT pin (i.e. 3 pins) of the timer chip U2 outputs to drive a pair of push-pull, the first field effect tube M1 and the second field effect tube M2 can be respectively in IRFR9014TRPBF and IRFR014TRPBF, the input stages of the two tubes are connected with blocking capacitors, namely an eighth capacitor C8 and a ninth capacitor C9, the eighth capacitor C8 and the ninth capacitor C9 are 104 capacitors, so that 15V square waves are converted into square waves of +/-7.5V to respectively drive the first field effect tube M1 and the second field effect tube M2, and voltage balance of the first output end A of the forward control circuit 2 and the second output end B (namely two points AB) of the forward control circuit 2 can be ensured to be +/-7.5 square wave pulses through a tenth capacitor C10 and an eleventh capacitor C11. The first output end A and the second output end B of the forward control circuit 2 are respectively connected with two ends of a primary side input winding of each forward transformer in the forward transformer set Tx, so that the output end of each forward transformer can form a voltage doubling circuit by a diode and a capacitor to obtain target voltage.

In a more specific embodiment, the forward transformer set Tx includes a first forward transformer T2, and the first forward transformer T2 includes a primary input first winding N7, a primary first winding N8, a secondary first winding N9, a secondary second winding N10, a first W-phase upper bridge driving power circuit V1W1, a first U-phase upper bridge driving power circuit V1U1, and a first V-phase upper bridge driving power circuit V1.

The same-name end of the primary input first winding N7 is connected with the first output end A of the forward control circuit 2, and the different-name end of the primary input first winding N7 is connected with the second output end B of the forward control circuit 2.

The first W-phase upper bridge driving power supply circuit V1W1 includes a ninth electrolytic capacitor E9, a tenth electrolytic capacitor E10, a seventh diode D7, an eighth diode D8, a ninth diode D9, and a fourteenth capacitor C14, wherein a second end of the fourteenth capacitor C14 and a negative electrode of the ninth diode D9 are connected to a homonymous end of the primary first winding N8, a first end of the fourteenth capacitor C14 is connected to an anode of the seventh diode D7 and a cathode of the eighth diode D8, a cathode of the seventh diode D7 is connected to an anode of the ninth electrolytic capacitor E9, an anode of the eighth diode D8 is connected to a cathode of the ninth electrolytic capacitor E9, an anode of the tenth electrolytic capacitor E10 is connected to a homonymous end of the primary first winding N8, and a cathode of the tenth electrolytic capacitor E10 is connected to an anode of the ninth diode D9.

The first U-phase upper bridge driving power supply circuit V1U1 includes a fifteenth capacitor C15, a twelfth diode D10, an eleventh diode D11, a twelfth diode D12, an eleventh electrolytic capacitor E11, and a twelfth electrolytic capacitor E12; the first end of the fifteenth capacitor C15 and the negative electrode of the twelfth diode D12 are connected with the same-name end of the secondary first winding N9, the second end of the fifteenth capacitor C15 is connected with the negative electrode of the twelfth diode D10 and the positive electrode of the eleventh diode D11, the positive electrode of the twelfth diode D10, the negative electrode of the eleventh electrolytic capacitor E11 and the positive electrode of the twelfth electrolytic capacitor E12 are connected with the different-name end of the secondary first winding N9, the negative electrode of the eleventh diode D11 is connected with the positive electrode of the eleventh electrolytic capacitor E11, and the positive electrode of the twelfth diode D12 is connected with the negative electrode of the twelfth electrolytic capacitor E12.

The first V-phase upper bridge driving power supply circuit V1 includes a sixteenth capacitor C16, a thirteenth diode D13, a fourteenth diode D14, a fifteenth diode D15, a thirteenth electrolytic capacitor E13, and a fourteenth electrolytic capacitor E14; the first end of the sixteenth capacitor C16 and the negative electrode of the fifteenth diode D15 are connected to the same-name end of the secondary second winding N10, the second end of the sixteenth capacitor C16 is connected to the negative electrode of the thirteenth diode D13 and the positive electrode of the fourteenth diode D14, the positive electrode of the thirteenth diode D13, the negative electrode of the thirteenth electrolytic capacitor E13 and the positive electrode of the fourteenth electrolytic capacitor E14 are connected to the different-name end of the secondary second winding N10, the negative electrode of the fourteenth diode D14 is connected to the positive electrode of the thirteenth electrolytic capacitor E13, and the positive electrode of the fifteenth diode D15 is connected to the negative electrode of the fourteenth electrolytic capacitor E14.

In this embodiment, referring to fig. 4, a voltage doubling circuit is formed by the first W-phase upper bridge driving power supply circuit V1W1, the first U-phase upper bridge driving power supply circuit V1U1, and the diode and the capacitor in the first V-phase upper bridge driving power supply circuit V1 to obtain the target voltage, so that the first forward transformer T2 may provide the W-phase upper bridge driving power supply v1w1±, the U-phase upper bridge driving power supply v1u1±and the V-phase upper bridge driving power supply v1v1±. A node connecting the negative electrode of the seventh diode D7 and the positive electrode of the ninth electrolytic capacitor E9 is used as an output terminal of the W-phase upper bridge driving positive power supply v1w1+ of the first IGBT, and a node connecting the negative electrode of the tenth electrolytic capacitor E10 and the positive electrode of the ninth diode D9 is used as an output terminal of the W-phase upper bridge driving negative power supply V1W 1-of the first IGBT; a node connecting the negative electrode of the eleventh diode D11 and the positive electrode of the eleventh electrolytic capacitor E11 is used as an output end of a U-phase upper bridge driving positive power supply V1U1+ of the first IGBT, and a node connecting the positive electrode of the twelfth diode D12 and the negative electrode of the twelfth electrolytic capacitor E12 is used as an output end of a U-phase upper bridge driving negative power supply V1U 1-of the first IGBT; the node connecting the negative electrode of the fourteenth diode D14 and the positive electrode of the thirteenth electrolytic capacitor E13 is used as the output end of the V-phase upper bridge driving positive power supply V1V1+ of the first IGBT, and the node connecting the positive electrode of the fifteenth diode D15 and the negative electrode of the fourteenth electrolytic capacitor E14 is used as the output end of the V-phase upper bridge driving negative power supply V1V 1-of the first IGBT. The U-phase upper bridge driving power supply of the first IGBT comprises a U-phase upper bridge driving positive power supply V1U1+ of the first IGBT and a U-phase upper bridge driving negative power supply V1U 1-of the first IGBT, wherein the U-phase upper bridge driving positive power supply V1U1+ of the first IGBT is obtained by a voltage doubling circuit formed by an eleventh diode D11, a twelfth diode D12 and a fifteenth capacitor C15, the U-phase upper bridge driving positive power supply V1U1+ of the first IGBT is a 15V upper bridge driving positive power supply, the U-phase upper bridge driving negative power supply V1U 1-of the first IGBT is obtained by a loop formed by the twelfth diode D12, and the U-phase upper bridge driving negative power supply V1U 1-of the first IGBT is a-7.5V upper bridge driving negative power supply. Meanwhile, the V-phase upper bridge driving power supply and the W-phase upper bridge driving power supply of the first IGBT are obtained, and the principle is the same as that described above.

In a more specific embodiment, the forward transformer set Tx further includes a second forward transformer T3, where the second forward transformer T3 includes a primary input second winding N11, a primary second winding N12, a secondary third winding N13, a secondary fourth winding N14, a second W-phase upper bridge driving power circuit V2W2, a second U-phase upper bridge driving power circuit V2U2, and a second V-phase upper bridge driving power circuit V2.

The same-name end of the primary input second winding N11 is connected with the first output end A of the forward control circuit 2, and the different-name end of the primary input second winding N11 is connected with the second output end B of the forward control circuit 2.

The second W-phase upper bridge driving power supply circuit V2W2 includes a fifteenth electrolytic capacitor E15, a sixteenth electrolytic capacitor E16, a sixteenth diode D16, a seventeenth diode D17, an eighteenth diode D18, and a seventeenth capacitor C17, wherein a second end of the seventeenth capacitor C17 and a negative electrode of the eighteenth diode D18 are connected to a homonymous end of the primary second winding N12, a first end of the seventeenth capacitor C17 is connected to an anode of the sixteenth diode D16 and a cathode of the seventeenth diode D17, a cathode of the sixteenth diode D16 is connected to an anode of the fifteenth electrolytic capacitor E15, an anode of the seventeenth diode D17 is connected to a cathode of the fifteenth electrolytic capacitor E15, an anode of the sixteenth electrolytic capacitor E16 is connected to a homonymous end of the primary second winding N12, and an anode of the sixteenth electrolytic capacitor E16 is connected to an anode of the eighteenth diode D18.

The second U-phase upper bridge driving power supply circuit V2U2 comprises an eighteenth capacitor C18, a nineteenth diode D19, a twentieth diode D20, a twenty-first diode D21, a seventeenth electrolytic capacitor E17 and an eighteenth electrolytic capacitor E18; the first end of the eighteenth capacitor C18 and the negative electrode of the twenty-second diode D21 are connected with the same-name end of the secondary third winding N13, the second end of the eighteenth capacitor C18 is connected with the negative electrode of the nineteenth diode D19 and the positive electrode of the twentieth diode D20, the positive electrode of the nineteenth diode D19, the negative electrode of the seventeenth electrolytic capacitor E17 and the positive electrode of the eighteenth electrolytic capacitor E18 are connected with the different-name end of the secondary third winding N13, the negative electrode of the twentieth diode D20 is connected with the positive electrode of the seventeenth electrolytic capacitor E17, and the positive electrode of the twenty-second diode D21 is connected with the negative electrode of the eighteenth electrolytic capacitor E18.

The second V-phase upper bridge driving power supply circuit V2 includes a nineteenth capacitor C19, a twenty-second diode D22, a twenty-third diode D23, a twenty-fourth diode D24, a nineteenth electrolytic capacitor E19, and a twentieth electrolytic capacitor E20; the first end of the nineteenth capacitor C19 and the negative electrode of the twenty-fourth diode D24 are connected to the same-name end of the secondary fourth winding N14, the second end of the nineteenth capacitor C19 is connected to the negative electrode of the twenty-second diode D22 and the positive electrode of the twenty-third diode D23, the positive electrode of the twenty-second diode D22, the negative electrode of the nineteenth electrolytic capacitor E19 and the positive electrode of the twentieth electrolytic capacitor E20 are connected to the different-name end of the secondary fourth winding N14, the negative electrode of the twenty-third diode D23 is connected to the positive electrode of the nineteenth electrolytic capacitor E19, and the positive electrode of the twenty-fourth diode D24 is connected to the negative electrode of the twentieth electrolytic capacitor E20.

In this embodiment, referring to fig. 4, the same principle as the first forward transformer T2 described above, the second forward transformer T3 may provide the W-phase upper bridge driving power V2w2±u-phase upper bridge driving power V2u2±v2 and the V-phase upper bridge driving power V2v2±v2 through the voltage doubling circuit formed by the diodes and the capacitors in the second W-phase upper bridge driving power circuit V2W2, the second U-phase upper bridge driving power V2U2 and the second V-phase upper bridge driving power V2V2±. A node connecting the negative electrode of the sixteenth diode D16 and the positive electrode of the fifteenth electrolytic capacitor E15 is used as an output terminal of the W-phase upper bridge driving positive power supply v2w2+ of the second IGBT, and a node connecting the negative electrode of the sixteenth electrolytic capacitor E16 and the positive electrode of the eighteenth diode D18 is used as an output terminal of the W-phase upper bridge driving negative power supply V2W 2-of the second IGBT; a node connecting the cathode of the twenty-first diode D20 and the anode of the seventeenth electrolytic capacitor E17 is used as the output end of a U-phase upper bridge driving positive power supply V2U2+ of the second IGBT, and a node connecting the anode of the twenty-first diode D21 and the cathode of the eighteenth electrolytic capacitor E18 is used as the output end of a U-phase upper bridge driving negative power supply V2U 2-of the second IGBT; the node connecting the negative electrode of the twenty-third diode D23 and the positive electrode of the nineteenth electrolytic capacitor E19 is used as the output end of the V-phase upper bridge driving positive power supply v2v2+ of the second IGBT, and the node connecting the positive electrode of the twenty-fourth diode D24 and the negative electrode of the twentieth electrolytic capacitor E20 is used as the output end of the V-phase upper bridge driving negative power supply V2-of the second IGBT.

In a more specific embodiment, the forward transformer set Tx further comprises a third forward transformer T4 and a fourth forward transformer T5.

The third forward transformer T4 comprises a primary input third winding N15, a primary third winding N16, a secondary fifth winding N17, a secondary sixth winding N18, a third W-phase upper bridge driving power supply circuit V3W3, a third U-phase upper bridge driving power supply circuit V3U3 and a third V-phase upper bridge driving power supply circuit V3V3.

The homonymous end of the primary input third winding N15 is connected with the first output end A of the forward control circuit 2, and the heteronymous end of the primary input third winding N15 is connected with the second output end B of the forward control circuit 2;

the third W-phase upper bridge driving power supply circuit V3W3 includes a twenty-first electrolytic capacitor E21, a twenty-second electrolytic capacitor E22, a twenty-fifth diode D25, a twenty-sixth diode D26, a twenty-seventh diode D27, and a twenty-seventh capacitor C20, wherein a second end of the twenty-seventh capacitor C20 and a negative electrode of the twenty-seventh diode D27 are connected to a homonymous end of the primary third winding N16, a first end of the twenty-fifth capacitor C20 is connected to an anode of the twenty-fifth diode D25 and a negative electrode of the twenty-sixth diode D26, a negative electrode of the twenty-fifth diode D25 is connected to a positive electrode of the twenty-first electrolytic capacitor E21, a positive electrode of the twenty-sixth diode D26 is connected to a negative electrode of the twenty-first electrolytic capacitor E21, a positive electrode of the twenty-second electrolytic capacitor E22 and a homonymous end of the primary third winding N16, and a negative electrode of the twenty-second electrolytic capacitor E22 and a positive electrode of the twenty-seventh diode D27 are connected.

The third U-phase upper bridge driving power supply circuit V3U3 includes a twenty-first capacitor C21, a twenty-eighth diode D28, a twenty-ninth diode D29, a thirty-third diode D30, a twenty-third electrolytic capacitor E23, and a twenty-fourth electrolytic capacitor E24; the first end of the twenty-first capacitor C21 and the negative electrode of the thirty-fourth capacitor E24 are connected with the same name end of the secondary fifth winding N17, the second end of the twenty-first capacitor C21 is connected with the negative electrode of the twenty-eighth diode D28 and the positive electrode of the twenty-ninth diode D29, the positive electrode of the twenty-eighth diode D28, the negative electrode of the twenty-third capacitor E23 and the positive electrode of the twenty-fourth capacitor E24 are connected with the different name end of the secondary fifth winding N17, the negative electrode of the twenty-ninth diode D29 is connected with the positive electrode of the twenty-third capacitor E23, and the positive electrode of the thirty-fourth capacitor E30 is connected with the negative electrode of the twenty-fourth capacitor E24.

The third V-phase upper bridge driving power supply circuit V3 includes a twenty-second capacitor C22, a thirty-second diode D31, a thirty-second diode D32, a thirty-third diode D33, a twenty-fifth electrolytic capacitor E25, and a twenty-sixth electrolytic capacitor E26; the first end of the twenty-second capacitor C22 and the negative electrode of the thirty-third diode D33 are connected with the same name end of the secondary sixth winding N18, the second end of the twenty-second capacitor C22 is connected with the negative electrode of the thirty-second diode D31 and the positive electrode of the thirty-second diode D32, the positive electrode of the thirty-second diode D31, the negative electrode of the twenty-fifth electrolytic capacitor E25 and the positive electrode of the twenty-sixth electrolytic capacitor E26 are connected with the different name end of the secondary sixth winding N18, the negative electrode of the thirty-second diode D32 is connected with the positive electrode of the twenty-fifth electrolytic capacitor E25, and the positive electrode of the thirty-third diode D33 is connected with the negative electrode of the twenty-sixth electrolytic capacitor E26.

The fourth forward transformer T5 comprises a primary input fourth winding N19, a primary fourth winding N20, a secondary seventh winding N21, a secondary eighth winding N22, a fourth W-phase upper bridge driving power supply circuit V4W4, a fourth U-phase upper bridge driving power supply circuit V4U4 and a fourth V-phase upper bridge driving power supply circuit V4V4.

The same-name end of the primary input fourth winding N19 is connected with the first output end A of the forward control circuit 2, and the different-name end of the primary input fourth winding N19 is connected with the second output end B of the forward control circuit 2.

The fourth W-phase upper bridge driving power supply circuit V4W4 includes a twenty-seventh electrolytic capacitor E27, a twenty-eighth electrolytic capacitor E28, a thirty-fourth diode D34, a thirty-fifth diode D35, a thirty-sixth diode D36, and a twenty-third capacitor C23, wherein a second end of the twenty-third capacitor C23 and a negative electrode of the thirty-sixth diode D36 are connected to a homonymous end of the primary fourth winding N20, a first end of the twenty-third capacitor C23 is connected to an anode of the thirty-fourth diode D34 and a cathode of the thirty-fifth diode D35, a cathode of the thirty-fourth diode D34 is connected to a cathode of the twenty-seventh electrolytic capacitor E27, an anode of the thirty-fifth diode D35 is connected to a cathode of the twenty-seventh electrolytic capacitor E27, a cathode of the twenty-eighth electrolytic capacitor E28 and a homonymous end of the primary fourth winding N20, and a cathode of the twenty-eighth electrolytic capacitor E28 and a cathode of the thirty-sixth diode D36 are connected.

The fourth U-phase upper bridge driving power supply circuit V4U4 includes a twenty-fourth capacitor C24, a thirty-seventh diode D37, a thirty-eighth diode D38, a thirty-ninth diode D39, a twenty-ninth electrolytic capacitor E29, and a thirty-eighth electrolytic capacitor E30; the first end of the twenty-fourth capacitor C24 and the negative electrode of the thirty-ninth diode D39 are connected to the same name end of the secondary seventh winding N21, the second end of the twenty-fourth capacitor C24 is connected to the negative electrode of the thirty-seventh diode D37 and the positive electrode of the thirty-eighth diode D38, the positive electrode of the thirty-seventh diode D37, the negative electrode of the twenty-ninth electrolytic capacitor E29 and the positive electrode of the thirty-ninth electrolytic capacitor E30 are connected to the different name end of the secondary seventh winding N21, the negative electrode of the thirty-eighth diode D38 is connected to the positive electrode of the twenty-ninth electrolytic capacitor E29, and the positive electrode of the thirty-ninth diode D39 is connected to the negative electrode of the thirty-eighth electrolytic capacitor E30.

The fourth V-phase upper bridge driving power supply circuit V4 includes a twenty-fifth capacitor C25, a forty-second diode D40, a forty-first diode D41, a forty-second diode D42, a thirty-first electrolytic capacitor E31, and a thirty-second electrolytic capacitor E32; the first end of the twenty-fifth capacitor C25 and the negative electrode of the fortieth second diode D42 are connected to the same-name end of the secondary eighth winding N22, the second end of the twenty-fifth capacitor C25 is connected to the negative electrode of the fortieth diode D40 and the positive electrode of the fortieth diode D41, the positive electrode of the fortieth diode D40, the negative electrode of the thirty-first electrolytic capacitor E31 and the positive electrode of the thirty-second electrolytic capacitor E32 are connected to the different-name end of the secondary eighth winding N22, the negative electrode of the fortieth diode D41 is connected to the positive electrode of the thirty-first electrolytic capacitor E31, and the positive electrode of the fortieth second diode D42 is connected to the negative electrode of the thirty-second electrolytic capacitor E32.

In this embodiment, referring to fig. 4, the same principle as the first forward transformer T2 described above, the third forward transformer T4 may provide the W-phase upper bridge driving power v3w3±u-phase upper bridge driving power v3u3±v3 and the V-phase upper bridge driving power v3v3±v3 through a voltage doubling circuit formed by the diodes and the capacitors in the third W-phase upper bridge driving power circuit V3W3, the third U-phase upper bridge driving power circuit V3U3 and the third V-phase upper bridge driving power circuit V3V3±to obtain the target voltage. A node connecting the negative electrode of the twenty-fifth diode D25 and the positive electrode of the twenty-seventh diode D27 serves as an output terminal of the W-phase upper bridge driving positive power supply v3w3+ of the third IGBT, and a node connecting the negative electrode of the twenty-second electrolytic capacitor E22 and the positive electrode of the twenty-seventh diode D27 serves as an output terminal of the W-phase upper bridge driving negative power supply V3W 3-of the third IGBT; a node connecting the negative electrode of the twenty-ninth diode D29 and the positive electrode of the twenty-third electrolytic capacitor E23 is used as an output end of a U-phase upper bridge driving positive power supply V3U3+ of the third IGBT, and a node connecting the positive electrode of the thirty-fourth diode D30 and the negative electrode of the twenty-fourth electrolytic capacitor E24 is used as an output end of a U-phase upper bridge driving negative power supply V3U 3-of the third IGBT; the node connecting the negative electrode of the thirty-second diode D32 and the positive electrode of the twenty-fifth electrolytic capacitor E25 is used as the output end of the V-phase upper bridge driving positive power supply v3v3+ of the third IGBT, and the node connecting the positive electrode of the thirty-third diode D33 and the negative electrode of the twenty-sixth electrolytic capacitor E26 is used as the output end of the V-phase upper bridge driving negative power supply V3-of the third IGBT.

The same principle as the first forward transformer T2 is that the fourth W-phase upper bridge driving power circuit V4W4, the fourth U-phase upper bridge driving power circuit V4U4, and the diodes and capacitors in the fourth V-phase upper bridge driving power circuit V4 constitute a voltage doubling circuit to obtain the target voltage, and the fourth forward transformer T5 may provide the W-phase upper bridge driving power V4W4±and the U-phase upper bridge driving power V4U4±and the V-phase upper bridge driving power V4V4±for the fourth IGBT. A node connecting the negative electrode of the thirty-fourth diode D34 and the positive electrode of the twenty-seventh electrolytic capacitor E27 is used as an output terminal of the W-phase upper bridge driving positive power supply v4w4+ of the fourth IGBT, and a node connecting the negative electrode of the twenty-eighth electrolytic capacitor E28 and the positive electrode of the thirty-sixth diode D36 is used as an output terminal of the W-phase upper bridge driving negative power supply V4W 4-of the fourth IGBT; a node connecting the negative electrode of the thirty-eighth diode D38 and the positive electrode of the twenty-ninth electrolytic capacitor E29 is used as an output end of a U-phase upper bridge driving positive power supply V4U4 < + > of the fourth IGBT, and a node connecting the positive electrode of the thirty-ninth diode D39 and the negative electrode of the thirty-eighth electrolytic capacitor E30 is used as an output end of a U-phase upper bridge driving negative power supply V4U4 < + >; the node connecting the negative electrode of the forty-second diode D41 and the positive electrode of the thirty-first electrolytic capacitor E31 is used as the output end of the V-phase upper bridge driving positive power supply v4v4+ of the fourth IGBT, and the node connecting the positive electrode of the forty-second diode D42 and the negative electrode of the thirty-second electrolytic capacitor E32 is used as the output end of the V-phase upper bridge driving negative power supply V4-of the fourth IGBT.

The invention provides an auxiliary power circuit suitable for a driver, comprising: flyback control circuit and multi-channel flyback output transformer; the multi-channel flyback output transformer comprises a primary side first winding, a primary side second winding, a primary side output circuit, a secondary side winding set and a secondary side output circuit set; the primary side output circuit is connected with the primary side second winding, the secondary side winding set comprises at least one secondary side winding, the secondary side output circuit set comprises at least one secondary side output circuit, and the at least one secondary side output circuit is correspondingly connected with the at least one secondary side winding respectively; one end of the primary side first winding is coupled with a low-voltage power supply, and the other end of the primary side first winding is coupled with a flyback control circuit, so that the multipath flyback output transformer outputs at least two auxiliary power supplies through a primary side output circuit and a secondary side output circuit set. The invention can provide the auxiliary power supply with low voltage power supply, can avoid the problem of misoperation and failure caused by high voltage power supply on the driver, and can reduce the production cost.

While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims

1. An auxiliary power circuit for a driver, comprising: flyback control circuit and multi-channel flyback output transformer;

the multi-channel flyback output transformer comprises a primary side first winding, a primary side second winding, a primary side output circuit, a secondary side winding set and a secondary side output circuit set; the primary side output circuit is connected with the primary side second winding, the secondary side winding set comprises at least one secondary side winding, the at least one secondary side winding is coupled with the primary side first winding and the primary side second winding, the secondary side output circuit set comprises at least one secondary side output circuit, and the at least one secondary side output circuit is correspondingly connected with the at least one secondary side winding respectively;

one end of the primary side first winding is coupled with a low-voltage power supply, and the other end of the primary side first winding is coupled with the flyback control circuit, so that the multipath flyback output transformer outputs at least two auxiliary power supplies through the primary side output circuit and the secondary side output circuit set;

any one auxiliary power supply of the at least two auxiliary power supplies is connected with a forward control circuit, and the forward control circuit is connected with a forward transformer set; the forward transformer set comprises at least one forward transformer, the forward transformer is used for outputting an IGBT driving power supply, and the output end of the forward control circuit is connected with the primary winding of each forward transformer in the forward transformer set;

The primary side output circuit comprises a first diode, a second diode, a first electrolytic capacitor and a first capacitor;

the positive electrode of the first diode and the positive electrode of the second diode are connected with the same-name end of the primary side second winding, the negative electrode of the first diode and the negative electrode of the second diode are connected with the positive electrode of the first electrolytic capacitor and the first end of the first capacitor, and the negative electrode of the first electrolytic capacitor, the second end of the first capacitor and the different-name end of the primary side second winding are grounded;

the node connecting the cathode of the first diode, the cathode of the second diode, the anode of the first electrolytic capacitor and the first end of the first capacitor is used as the output end of the primary side output circuit so as to output a first auxiliary power supply;

the forward control circuit comprises a timer chip, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a sixth electrolytic capacitor, a seventh electrolytic capacitor, an eighth electrolytic capacitor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a first field effect transistor and a second field effect transistor;

The first end of the sixth capacitor, the positive electrode of the sixth electrolytic capacitor, the first end of the third resistor, the VCC pin of the timer chip and the RESET pin of the timer chip are connected with the first auxiliary power supply, the second end of the third resistor is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the first end of the fifth resistor, the second end of the fifth resistor is connected with the first end of the seventh capacitor, the THOLD pin of the timer chip, the TRIG pin of the timer chip and the first end of the sixth resistor, the second end of the seventh capacitor is grounded with the GND pin of the timer chip, the OUT pin of the timer chip is connected with the second end of the sixth resistor, the first end of the seventh resistor and the first end of the tenth resistor, the second end of the seventh resistor is connected with the first end of the eighth capacitor, the second end of the eighth capacitor is connected with the second end of the eighth resistor and the grid electrode of the first field effect tube, the second end of the tenth resistor is connected with the first end of the ninth capacitor, the second end of the ninth capacitor is connected with the first end of the eleventh resistor and the grid electrode of the second field effect tube, the drain electrode of the second field effect tube is connected with the drain electrode of the first field effect tube, the source electrode of the first field effect tube, the first end of the eighth resistor, the positive electrode of the seventh electrolytic capacitor, the first end of the twelfth capacitor and the first end of the ninth resistor are connected with the first auxiliary power supply, the negative electrode of the seventh electrolytic capacitor is connected with the second end of the tenth capacitor, the second end of the eleventh capacitor, the positive electrode of the eighth electrolytic capacitor, the second end of the twelfth capacitor, the third electrode of the eighth electrolytic capacitor, the second end of the ninth resistor, the first end of the thirteenth capacitor and the first end of the twelfth resistor are connected, the first end of the tenth capacitor is connected with the first end of the eleventh capacitor, the second end of the eleventh resistor, the source electrode of the second field effect transistor, the negative electrode of the eighth electrolytic capacitor, the second end of the thirteenth capacitor and the second end of the twelfth resistor are grounded;

2. The auxiliary power circuit for a driver of claim 1, wherein the at least one secondary side output circuit comprises a first secondary side output circuit comprising a third diode, a fourth diode, a second electrolytic capacitor, a third electrolytic capacitor, a second capacitor, a third capacitor, and a first resistor;

the positive electrode of the third diode is connected with the same-name end of the corresponding first secondary winding, the negative electrode of the third diode is connected with the positive electrode of the second electrolytic capacitor and the first end of the second capacitor, the negative electrode of the second electrolytic capacitor, the second end of the second capacitor, the positive electrode of the third electrolytic capacitor and the first end of the third capacitor are connected with the opposite-name end of the corresponding first secondary winding, the negative electrode of the third electrolytic capacitor, the second end of the third capacitor and the second end of the first resistor are connected with the positive electrode of the fourth diode, and the negative electrode of the fourth diode is connected with the opposite-name end of the corresponding second secondary winding;

3. The auxiliary power circuit for a driver of claim 2 wherein the at least one secondary side output circuit further comprises a second secondary side output circuit comprising a fifth diode, a first inductor, a fourth electrolytic capacitor, and a fourth capacitor;

the negative electrode of the fifth diode is connected with the synonym end of the corresponding secondary winding, the positive electrode of the fifth diode is connected with the first end of the first inductor, the second end of the first inductor is connected with the negative electrode of the fourth electrolytic capacitor and the second end of the fourth capacitor, and the synonym end of the corresponding secondary winding, the positive electrode of the fourth electrolytic capacitor and the first end of the fourth capacitor are grounded;

4. The auxiliary power circuit for a driver of claim 3 wherein the at least one secondary side output circuit further comprises a third secondary side output circuit comprising a sixth diode, a fifth electrolytic capacitor, a fifth capacitor and a second resistor;

the positive electrode of the sixth diode is connected with one end of a corresponding secondary winding, the negative electrode of the sixth diode is connected with the positive electrode of the fifth electrolytic capacitor, the first end of the fifth capacitor and the first end of the second resistor, and the negative electrode of the fifth electrolytic capacitor, the second end of the fifth capacitor and the second end of the second resistor are connected with the other end of the corresponding secondary winding;

5. The auxiliary power circuit for a drive of claim 1 wherein the set of forward transformers comprises a first forward transformer comprising a primary input first winding, a primary first winding, a secondary second winding, a first W-phase upper bridge drive power circuit, a first U-phase upper bridge drive power circuit, and a first V-phase upper bridge drive power circuit;

the homonymous end of the primary input first winding is connected with the first output end of the forward control circuit, and the heteronymous end of the primary input first winding is connected with the second output end of the forward control circuit;

the first W-phase upper bridge driving power supply circuit comprises a ninth electrolytic capacitor, a tenth electrolytic capacitor, a seventh diode, an eighth diode, a ninth diode and a fourteenth capacitor, wherein the second end of the fourteenth capacitor and the negative electrode of the ninth diode are connected with the same-name end of the primary first winding, the first end of the fourteenth capacitor is connected with the positive electrode of the seventh diode and the negative electrode of the eighth diode, the negative electrode of the seventh diode is connected with the positive electrode of the ninth electrolytic capacitor, the positive electrode of the eighth diode is connected with the negative electrode of the ninth electrolytic capacitor, the positive electrode of the tenth electrolytic capacitor and the different-name end of the primary first winding, and the negative electrode of the tenth electrolytic capacitor is connected with the positive electrode of the ninth diode;

The first U-phase upper bridge driving power supply circuit comprises a fifteenth capacitor, a twelfth pole tube, an eleventh diode, a twelfth diode, an eleventh electrolytic capacitor and a twelfth electrolytic capacitor; the first end of the fifteenth capacitor and the negative electrode of the twelfth diode are connected with the same-name end of the secondary first winding, the second end of the fifteenth capacitor is connected with the negative electrode of the twelfth pole tube and the positive electrode of the eleventh diode, the positive electrode of the twelfth pole tube, the negative electrode of the eleventh electrolytic capacitor and the positive electrode of the twelfth electrolytic capacitor are connected with the different-name end of the secondary first winding, the negative electrode of the eleventh diode is connected with the positive electrode of the eleventh electrolytic capacitor, and the positive electrode of the twelfth diode is connected with the negative electrode of the twelfth electrolytic capacitor;

6. The auxiliary power circuit for a drive of claim 5 wherein the set of forward transformers further comprises a second forward transformer, the second forward transformer comprising a primary input second winding, a primary second winding, a secondary third winding, a secondary fourth winding, a second W-phase upper bridge drive power circuit, a second U-phase upper bridge drive power circuit, and a second V-phase upper bridge drive power circuit;

the homonymous end of the primary input second winding is connected with the first output end of the forward control circuit, and the heteronymous end of the primary input second winding is connected with the second output end of the forward control circuit;

the second W-phase upper bridge driving power supply circuit comprises a fifteenth electrolytic capacitor, a sixteenth diode, a seventeenth diode, an eighteenth diode and a seventeenth capacitor, wherein the second end of the seventeenth capacitor and the negative electrode of the eighteenth diode are connected with the same name end of the primary second winding, the first end of the seventeenth capacitor is connected with the positive electrode of the sixteenth diode and the negative electrode of the seventeenth diode, the negative electrode of the sixteenth diode is connected with the positive electrode of the fifteenth electrolytic capacitor, the positive electrode of the seventeenth diode is connected with the negative electrode of the fifteenth electrolytic capacitor, the positive electrode of the sixteenth electrolytic capacitor and the different name end of the primary second winding, and the negative electrode of the sixteenth electrolytic capacitor is connected with the positive electrode of the eighteenth diode;

The second U-phase upper bridge driving power supply circuit comprises an eighteenth capacitor, a nineteenth diode, a twentieth diode, a seventeenth electrolytic capacitor and an eighteenth electrolytic capacitor; the first end of the eighteenth capacitor and the negative electrode of the twenty-second diode are connected with the same-name end of the secondary third winding, the second end of the eighteenth capacitor is connected with the negative electrode of the nineteenth diode and the positive electrode of the twentieth diode, the positive electrode of the nineteenth diode, the negative electrode of the seventeenth electrolytic capacitor and the positive electrode of the eighteenth electrolytic capacitor are connected with the different-name end of the secondary third winding, the negative electrode of the twentieth diode is connected with the positive electrode of the seventeenth electrolytic capacitor, and the positive electrode of the twenty-second diode is connected with the negative electrode of the eighteenth electrolytic capacitor;

7. The auxiliary power circuit for a driver of claim 6 wherein the set of forward transformers further comprises a third forward transformer and a fourth forward transformer;

the third forward transformer comprises a primary input third winding, a primary third winding, a secondary fifth winding, a secondary sixth winding, a third W-phase upper bridge driving power supply circuit, a third U-phase upper bridge driving power supply circuit and a third V-phase upper bridge driving power supply circuit;

the homonymous end of the primary input third winding is connected with the first output end of the forward control circuit, and the heteronymous end of the primary input third winding is connected with the second output end of the forward control circuit;

the third W-phase upper bridge driving power supply circuit comprises a twenty-first electrolytic capacitor, a twenty-second electrolytic capacitor, a twenty-fifth diode, a twenty-sixth diode, a twenty-seventh diode and a twenty-seventh capacitor, wherein the second end of the twenty-seventh capacitor and the negative electrode of the twenty-seventh diode are connected with the same-name end of the primary third winding, the first end of the twenty-seventh capacitor is connected with the positive electrode of the twenty-fifth diode and the negative electrode of the twenty-sixth diode, the negative electrode of the twenty-fifth diode is connected with the positive electrode of the twenty-first electrolytic capacitor, the positive electrode of the twenty-sixth diode is connected with the negative electrode of the twenty-first electrolytic capacitor, the positive electrode of the twenty-second electrolytic capacitor and the different-name end of the primary third winding, and the negative electrode of the twenty-second electrolytic capacitor is connected with the positive electrode of the twenty-seventh diode;

The third U-phase upper bridge driving power supply circuit comprises a twenty-first capacitor, a twenty-eighth diode, a twenty-ninth diode, a thirty-third diode, a twenty-third electrolytic capacitor and a twenty-fourth electrolytic capacitor; the first end of the twenty-first capacitor and the negative electrode of the thirty-first diode are connected with the same-name end of the secondary fifth winding, the second end of the twenty-first capacitor is connected with the negative electrode of the twenty-eighth diode and the positive electrode of the twenty-ninth diode, the positive electrode of the twenty-eighth diode, the negative electrode of the twenty-third electrolytic capacitor and the positive electrode of the twenty-fourth electrolytic capacitor are connected with the different-name end of the secondary fifth winding, the negative electrode of the twenty-ninth diode is connected with the positive electrode of the twenty-third electrolytic capacitor, and the positive electrode of the thirty-fourth electrolytic capacitor is connected with the negative electrode of the twenty-fourth electrolytic capacitor;

the third V-phase upper bridge driving power supply circuit comprises a twenty-second capacitor, a thirty-second diode, a thirty-third diode, a twenty-fifth electrolytic capacitor and a twenty-sixth electrolytic capacitor; the first end of the twenty-second capacitor and the negative electrode of the thirty-third diode are connected with the same-name end of the secondary sixth winding, the second end of the twenty-second capacitor is connected with the negative electrode of the first thirty-second diode and the positive electrode of the thirty-second diode, the positive electrode of the first thirty-second diode, the negative electrode of the twenty-fifth electrolytic capacitor and the positive electrode of the twenty-sixth electrolytic capacitor are connected with the different-name end of the secondary sixth winding, the negative electrode of the thirty-second diode is connected with the positive electrode of the twenty-fifth electrolytic capacitor, and the positive electrode of the thirty-third diode is connected with the negative electrode of the twenty-sixth electrolytic capacitor;

The fourth forward transformer comprises a primary input fourth winding, a primary fourth winding, a secondary seventh winding, a secondary eighth winding, a fourth W-phase upper bridge driving power supply circuit, a fourth U-phase upper bridge driving power supply circuit and a fourth V-phase upper bridge driving power supply circuit;

the homonymous end of the primary input fourth winding is connected with the first output end of the forward control circuit, and the heteronymous end of the primary input fourth winding is connected with the second output end of the forward control circuit;

the fourth W-phase upper bridge driving power supply circuit comprises a twenty-seventh electrolytic capacitor, a twenty-eighth electrolytic capacitor, a thirty-fourth diode, a thirty-fifth diode, a thirty-sixth diode and a twenty-third capacitor, wherein the second end of the twenty-third capacitor and the negative electrode of the thirty-sixth diode are connected with the same name end of the primary fourth winding, the first end of the twenty-third capacitor is connected with the positive electrode of the thirty-fourth diode and the negative electrode of the thirty-fifth diode, the negative electrode of the thirty-fourth diode is connected with the positive electrode of the twenty-seventh electrolytic capacitor, the positive electrode of the thirty-fifth diode is connected with the negative electrode of the twenty-seventh electrolytic capacitor, the positive electrode of the twenty-eighth electrolytic capacitor and the different name end of the primary fourth winding, and the negative electrode of the twenty-eighth electrolytic capacitor is connected with the positive electrode of the thirty-sixth diode;

The fourth U-phase upper bridge driving power supply circuit comprises a twenty-fourth capacitor, a thirty-seventh diode, a thirty-eighth diode, a thirty-ninth diode, a twenty-ninth electrolytic capacitor and a thirty-eighth electrolytic capacitor; the first end of the twenty-fourth capacitor and the negative electrode of the thirty-ninth diode are connected with the same-name end of the secondary seventh winding, the second end of the twenty-fourth capacitor is connected with the negative electrode of the thirty-seventh diode and the positive electrode of the thirty-eighth diode, the positive electrode of the thirty-seventh diode, the negative electrode of the twenty-ninth electrolytic capacitor and the positive electrode of the thirty-eighth electrolytic capacitor are connected with the different-name end of the secondary seventh winding, the negative electrode of the thirty-eighth diode is connected with the positive electrode of the twenty-ninth electrolytic capacitor, and the positive electrode of the thirty-ninth diode is connected with the negative electrode of the thirty-eighth electrolytic capacitor;