Drive power supply circuit and method applied to energy bidirectional flow device

Abstract

The application provides a driving power supply circuit and method applied to a bidirectional energy flow device, which comprises a pulse width modulation generator circuit, a transformer and a rectifier circuit connected in sequence; the pulse width modulation generator circuit is connected to an input end of a primary winding of the transformer through a direct-current isolation capacitor; a secondary winding rectifier circuit of the transformer comprises a positive output loop and a negative output loop, and can generate two isolated positive and negative power supplies; in a switching period, one winding outputs a positive power supply and the other winding outputs a negative power supply alternately to ensure the balance of the transformer; meanwhile, through the configuration of a current limiting resistor and a voltage stabilizing tube in the rectifier circuit, the positive and negative power supplies for driving SICMOS can be obtained.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of power electronics, and particularly relates to a driving power supply circuit and method applied to an energy bidirectional flow device. BACKGROUND

[0002] In recent years, with the rapid development of electric vehicles, the number of mobile energy storage units is also increasing. As long as such energy storage units can be intelligently used to store capacity, great potential can be brought. At present, energy bidirectional flow devices are basically divided into bidirectional DC-DC devices and bidirectional AC-DC devices. Compared with the previous unidirectional devices, the main characteristics of such devices are high voltage, complex topology and active power devices on both sides. Therefore, SiC power devices become the first choice for such devices, and the application of SICMOS drives the development of the power electronics field in the direction of high power density and miniaturization. Compared with ordinary SI-MOS, SICMOS has the advantages of high switching frequency, high insulation withstand voltage, small parasitic parameters and low loss. Domestic and foreign manufacturers have successively launched SICMOS devices. However, the difference in technology and process of different manufacturers causes the opening voltage of SICMOS to be different, which in turn causes the driving voltage to be different.

[0003] Due to the low opening voltage of SICMOS, in order to ensure the safety and reliability of the driving, a negative voltage is generally constructed as the off voltage of SICMOS. However, the off voltage of different manufacturers is also different, and it is not flexible to use different types of devices in the design. In view of this problem, on the one hand, different voltages are constructed by replacing power supply chips, and on the other hand, different voltages are constructed by adding different voltage stabilizing tubes to the secondary side of the driving transformer.

[0004] The inventor finds that the scheme of replacing the power supply chip increases the complexity and cost of the circuit, and especially in the topology with more power devices, it also occupies a large space; the scheme of adding different voltage stabilizing tubes to the secondary side of the driving transformer has limited application occasions using the driving transformer with voltage stabilizing tubes, and can only be applied in full-bridge, half-bridge and other topologies, but cannot be used in three-phase Vienna and three-phase H-bridge topologies. A more serious problem is that the off voltage of the driving is realized by the parallel connection of the voltage stabilizing tube and the capacitor, and in the switching process, the off voltage will affect the stability of the negative power supply due to the charging and discharging of the parasitic capacitor, thereby affecting the reliability of the driving. SUMMARY

[0005] In order to solve the above problems, the present application proposes a driving power supply circuit and method applied to an energy bidirectional flow device. The driving power supply circuit involved in the present application has small volume, simple configuration and supports external expansion, which can meet the driving of various topologies on the one hand, and can provide stable positive and negative voltages to ensure the reliability of SICMOS on the other hand.

[0006] In order to achieve the above object, the present application is realized by the following technical scheme:

[0007] In the first aspect, the present application provides a driving power supply circuit applied to a bidirectional energy flow device, comprising:

[0008] a pulse width modulation generator circuit, a transformer and a rectifier circuit connected in sequence;

[0009] The pulse width modulation generator circuit is connected to the input end of the primary winding circuit of the transformer through a DC blocking capacitor;

[0010] The secondary winding circuit of the transformer comprises a positive output loop and a negative output loop; the rectifier circuit is connected in parallel to the positive output loop and the negative output loop;

[0011] The rectifier circuit comprises a current limiting resistor and a voltage stabilizing tube connected in series, and the circuit connected after the current limiting resistor and the voltage stabilizing tube is connected in parallel to the positive output loop and the negative output loop; further comprising a capacitor, the positive end of the capacitor is connected to the cathode of the voltage stabilizing tube, and the negative end of the capacitor is connected to the anode of the voltage stabilizing tube to output a driving positive power source.

[0012] Further, the pulse width modulation generator circuit comprises at least a control chip, and two output pins of the control chip are connected to a second resistor and an eleventh resistor, respectively;

[0013] The second resistor is connected to the base of a first triode and a second triode at one end away from the control chip, and the collector of the first triode is connected to a power supply voltage; the emitter of the first triode is connected to the emitter of the second triode to output a first pulse width modulation signal;

[0014] The eleventh resistor is connected to the base of a third triode and a fourth triode at one end away from the control chip, and the collector of the third triode is connected to a power supply voltage; the emitter of the third triode is connected to the emitter of the fourth triode to output a second pulse width modulation signal.

[0015] Further, the first pulse width modulation signal and the second pulse width modulation signal are 180° different from each other.

[0016] Further, a first capacitor is connected in parallel between the first triode and the power supply voltage, and a seventeenth capacitor is connected in parallel between the third triode and the power supply voltage; the first capacitor and the seventeenth capacitor are both energy storage capacitors.

[0017] Further, the primary winding circuit of the transformer is connected to the same end of the primary winding of the transformer through a DC blocking capacitor, and the different end is connected to the output end of the second pulse width modulation signal.

[0018] Further, the transformer secondary winding circuit comprises a first secondary winding sub-circuit and a second secondary winding sub-circuit.

[0019] In the first secondary winding sub-circuit, two like-named terminals are connected to the anode of a second diode and the cathode of a fourth diode respectively, the cathode of the second diode is connected to the positive terminal of a second capacitor and a third capacitor, the negative terminals of the second capacitor and the third capacitor are connected to two unlike-named terminals respectively; the anode of the fourth diode is connected to the negative terminal of a seventh capacitor and an eighth capacitor, the positive terminals of the seventh capacitor and the eighth capacitor are connected to two unlike-named terminals respectively.

[0020] In the second secondary winding sub-circuit, two unlike-named terminals are connected to the anode of an eighth diode and the cathode of a sixth diode respectively, the cathode of the eighth diode is connected to the positive terminal of a twenty-first capacitor and a twenty-second capacitor, the negative terminals of the twenty-first capacitor and the twenty-second capacitor are connected to two like-named terminals respectively; the anode of the sixth diode is connected to the negative terminal of a fifteenth capacitor and a sixteenth capacitor, the positive terminals of the fifteenth capacitor and the sixteenth capacitor are connected to two like-named terminals respectively.

[0021] Further, the second diode, the fourth diode, the eighth diode and the sixth diode are all rectifier diodes.

[0022] Further, in the rectifier circuit, one end of a first resistor for current limiting is connected to the cathode of the second diode, the other end is connected to the cathode of a first stabilizing tube, the anode of the first stabilizing tube is connected to an unlike-named terminal in the first secondary winding sub-circuit; further comprising a fourth capacitor, the positive terminal of the fourth capacitor is connected to the cathode of the first stabilizing tube, the negative terminal is connected to the anode of the first stabilizing tube, and a driving positive power is outputted externally; one end of a fifth resistor for current limiting is connected to an unlike-named terminal in the first secondary winding sub-circuit, the other end is connected to the cathode of a third stabilizing tube, the anode of the third stabilizing tube is connected to the anode of the fourth diode; further comprising a sixth capacitor, the positive terminal of the sixth capacitor is connected to the cathode of the third stabilizing tube, the negative terminal is connected to the anode of the third stabilizing tube, and a driving negative power is outputted externally.

[0023] The seventh resistor for current limiting has one end connected to the same end in the second secondary winding subcircuit and the other end connected to the cathode of the fifth stabilizing tube, the anode of the fifth stabilizing tube is connected to the anode of the sixth diode, and the positive terminal of the thirteenth capacitor is connected to the cathode of the fifth stabilizing tube, the negative terminal of the thirteenth capacitor is connected to the anode of the fifth stabilizing tube, and the driving negative power is outputted externally; the tenth resistor for current limiting has one end connected to the cathode of the eighth diode and the other end connected to the cathode of the seventh stabilizing tube, the anode of the seventh stabilizing tube is connected to the same end in the second secondary winding subcircuit; and the positive terminal of the twentieth capacitor is connected to the cathode of the seventh stabilizing tube, the negative terminal of the twentieth capacitor is connected to the anode of the seventh stabilizing tube, and the driving positive power is outputted externally.

[0024] Further, the transformer comprises one primary winding coil and two secondary winding coils, the three winding coils are wound on the same magnetic core; the winding mode is that the two secondary winding coils are wound in multiple turns, then the three winding coils are wound in multiple turns, and finally the two secondary winding coils are wound in multiple turns again.

[0025] In a second aspect, the application further provides a driving method applied to the energy bidirectional flow device, comprising:

[0026] The first pulse width modulation signal and the second pulse width modulation signal are connected to the transformer primary winding circuit through the DC blocking capacitor, and the DC blocking capacitor can work at the same end or different end;

[0027] When the primary winding is in the positive half cycle, the same end of the primary winding is at high level, the same end in the first secondary winding subcircuit is induced at high level, and after rectification through the second diode, the second capacitor and the third capacitor, the same end in the first secondary winding subcircuit is returned, and the positive voltage is outputted through the first resistor and the first stabilizing tube; at the same time, the same end in the second secondary winding subcircuit is induced at high level, and after rectification through the forty-fifth capacitor, the sixteenth capacitor and the sixth diode, the same end in the first secondary winding subcircuit is returned, and the negative voltage is outputted through the seventh resistor and the fifth diode;

[0028] When the primary winding is in the negative half cycle, the different end of the primary winding is at high level, the different end in the first secondary winding subcircuit is induced at high level, and after rectification through the seventh capacitor, the eighth capacitor and the fourth diode, the different end in the first secondary winding subcircuit is returned, and the negative voltage is outputted through the fifth resistor and the third stabilizing tube; at the same time, the different end in the second secondary winding subcircuit is induced at high level, and after rectification through the eighth diode, the twenty-first capacitor and the twenty-second capacitor, the different end in the second secondary winding subcircuit is returned, and the negative voltage is outputted through the tenth resistor and the seventh diode;

[0029] Two isolated positive and negative power supplies are generated, and one winding outputs positive power supply and the other winding outputs negative power supply alternately in the switching cycle.

[0030] Compared with the prior art, the present application has the following advantages:

[0031] In the present application, the pulse width modulation generator circuit is connected to the input end of the primary winding of the transformer through a DC blocking capacitor, the transformer secondary rectifier circuit comprises a positive output loop and a negative output loop, and can generate two isolated positive and negative power supplies. In a switching cycle, one winding outputs positive power supply and the other winding outputs negative power supply alternately, so as to ensure the balance of the transformer operation. At the same time, through the configuration of the current limiting resistor and the voltage stabilizing tube in the rectifier circuit, the positive and negative power supplies for driving SICMOS can be obtained. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings, which form a part of this implementation, are used to provide further understanding of this implementation, and the schematic implementation of this implementation and its description are used to explain this implementation, and do not constitute an improper limitation on this implementation.

[0033] Figure 1 is the overall block diagram of the energy bidirectional flow device according to the embodiment 1 of the present application;

[0034] Figure 2 is the principle block diagram of the embodiment 1 of the present application;

[0035] Figure 3 is the pulse width modulation generator circuit diagram of the embodiment 1 of the present application;

[0036] Figure 4 is the transformer output positive and negative power supply circuit diagram of the embodiment 1 of the present application;

[0037] Figure 5 is the SICMOS drive power supply positive half cycle working principle block diagram of the embodiment 2 of the present application;

[0038] Figure 6 is the SICMOS drive power supply negative half cycle working principle block diagram of the embodiment 2 of the present application;

[0039] Figure 7 is the pulse width modulation generator circuit diagram of the embodiment 3 of the present application;

[0040] Figure 8 is the transformer output positive and negative power supply circuit diagram of the embodiment 3 of the present application. DETAILED DESCRIPTION

[0041] The present application will be further described below in combination with the drawings and embodiments.

[0042] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0043] Example 1:

[0044] This embodiment provides a SICMOS driving power supply circuit for a bidirectional energy flow device, belonging to the category of driving power supply circuits for bidirectional energy flow devices, such as... Figure 1 As shown, port A is connected to power switch unit A, which is connected to power switch unit B via a high-frequency isolation transformer. Port B is also connected to power switch unit B. Energy can flow from port A to port B, or vice versa. Power switch units A and B are respectively connected to their respective drivers and drive power supplies.

[0045] SICMOS drive power supply, such as Figure 2 As shown, it includes a pulse width modulation (PWM) generator circuit, a transformer, a rectifier circuit, and positive and negative power supplies; the PWM generator circuit, the transformer, the rectifier circuit, and the positive and negative power supplies are connected in sequence, the PWM generator circuit is connected to the input terminal of the primary winding of the transformer, and the secondary winding of the transformer is connected to the rectifier circuit and outputs positive and negative power supplies.

[0046] like Figure 3As shown, the specific structure of the PWM generator circuit is: including PWM control chip SG3525; third resistor R3, fifth resistor C5 and fourth resistor R4, eleventh capacitor C11 and nineteenth capacitor C19 and the compensation circuit composed of internal operational amplifier; sixth resistor R6 and fourteenth capacitor C14 constitute a charging circuit, eighth resistor R8 and the fourteenth capacitor C14 constitute a discharge circuit, according to the three parameters set the oscillation frequency and dead time of SG3525; the eighteenth capacitor C18 connects the internal constant current source, the capacitor charging can set the slow rise time, and the voltage of the slow rise capacitor is limited by the nineteenth diode D9; the ninth resistor R9 is the pull-down resistor of the external abnormal interrupt control pin; the tenth capacitor C10 and the twelfth capacitor C12 are connected to the power supply pin Vcc as filter capacitors; the second resistor R2 and the eleventh resistor R11 are connected to the PWM output pin OUTB (first output pin) and OUTA (second output pin) of the chip respectively, and the two PWM signals are different by 180°; the other end of the second resistor R2 is connected to the base of the first transistor Q1 and the second transistor Q2, the collector of the first transistor Q1 is connected in parallel with the first capacitor C1, and the first capacitor C1 is an energy storage capacitor; the emitter of the first transistor Q1 is connected to the emitter of the second transistor Q2, and the PWM+ signal is output externally; the collector of the second transistor Q2 is connected to the system GND; the other end of the eleventh resistor R11 is connected to the base of the third transistor and the fourth transistor, the collector of the third transistor Q3 is connected in parallel with the seventeenth capacitor C17, and the seventeenth capacitor C17 is an energy storage capacitor; the emitter of the third transistor Q3 is connected to the emitter of the fourth transistor Q4, and the PWM- signal is output externally; the collector of the fourth transistor Q4 is connected to the system GND; the PWM+ and PWM- signals are different by 180°.

[0047] As Figure 4As shown, the transformer output positive and negative power supply circuit specific structure is: by transformer primary circuit, transformer secondary rectifier circuit, voltage stabilizing circuit; transformer primary circuit is the output of the PWM+ through the direct current capacitor C9 connection transformer primary winding of the same name 2, the opposite end 4 connection output of the PWM- transformer secondary winding circuit includes a first secondary winding sub-circuit and the second secondary winding sub-circuit; the first secondary winding sub-circuit, the transformer secondary circuit winding of the same name 10 connection second diode D2 anode and the fourth diode D4 cathode, the second diode D2 cathode is connected with the third capacitor C2 and C3 positive terminal, the second capacitor C2 and the third capacitor C3 negative terminal connection winding of the opposite end 9; fourth diode D4 anode is connected with the seventh capacitor C7 and the eighth capacitor C8 negative terminal, the seventh capacitor C7 and the eighth capacitor C8 positive terminal connection winding of the opposite end 9; the second secondary winding sub-circuit, the transformer secondary circuit winding of the opposite end 6 connection eighth diode D8 anode and sixth diode D6 cathode, the eighth diode D8 cathode is connected with the twenty first capacitor C21 and the twenty second capacitor C22 positive terminal, the twenty first capacitor C21 and the twenty second capacitor C22 negative terminal connection winding of the same name 7; the sixth diode D6 anode is connected with the fifteenth capacitor C15 and the sixteenth capacitor C16 negative terminal, the fifteenth capacitor C15 and the sixteenth capacitor C16 positive terminal connection winding of the same name 7; the second diode D2, the fourth diode D4, the eighth diode D8 and the sixth diode D6 are all rectifier diode.

[0048] The steady voltage circuit is characterized in that: the first resistor R1 is connected to the cathode of the second diode D2 as a current limiting resistor, and the other end is connected to the cathode of the first zener D1; the anode of the first zener D1 is connected to the opposite end 9 of the secondary winding; the positive end of the fourth capacitor C4 is connected to the cathode of the first zener D1, and the negative end is connected to the anode of the first zener D1 to output the driving positive power supply (+VA, 0VA) externally; the fifth resistor R5 is connected to the opposite end 9 of the secondary winding as a current limiting resistor, and the other end is connected to the cathode of the third zener D3; the anode of the third zener D3 is connected to the anode of the fourth diode D4; the positive end of the sixth capacitor C6 is connected to the cathode of the third zener D3, and the negative end is connected to the anode of the third zener D3 to output the driving negative power supply (-VA, 0VA) externally; the seventh resistor R7 is connected to the same end 7 of the secondary winding as a current limiting resistor, and the other end is connected to the cathode of the fifth zener D5; the anode of the fifth zener D5 is connected to the anode of the sixth diode D6; the positive end of the thirteenth capacitor C13 is connected to the cathode of the fifth zener D5, and the negative end is connected to the anode of the fifth zener D5 to output the driving negative power supply (-VB, 0VB) externally; the tenth resistor R10 is connected to the cathode of the eighth diode D8 as a current limiting resistor, and the other end is connected to the cathode of the seventh zener D7; the anode of the seventh zener D7 is connected to the same end 7 of the secondary winding; the positive end of the twentieth capacitor C20 is connected to the cathode of the seventh zener D7, and the negative end is connected to the anode of the seventh zener D7 to output the driving positive power supply (+VB, 0VB) externally.

[0049] The transformer is composed of one primary winding and two secondary windings, and the turn ratio can be 10:18:18. The specific turn ratio is designed according to the actual application, and the three windings are wound on the same magnetic core. The specific winding mode can be that the two secondary coils are wound for 4 turns, then the three primary coils are wound for 10 turns, and finally the two secondary windings are wound for 4 turns. In this way, the consistency of the parameters of the two windings is maximally guaranteed, and more stable two-way voltage can be obtained. The transformer is composed of one primary winding and two secondary windings, and the three windings are wound on the same magnetic core. If the turn ratio is not 1:1, the winding mode of secondary winding-primary-secondary winding-secondary winding is adopted, and the number of turns of the innermost layer and the outermost layer is consistent. In this way, the consistency of the parameters of the two windings is maximally guaranteed, and more stable two-way voltage can be obtained.

[0050] The beneficial effects of the embodiment include:

[0051] 1. The problem of topology limitation when driving SICMOS with a driving transformer is solved, and the driving power supply can still be normally provided when the driving duty cycle is greater than 50%;

[0052] 2. The instability problem of generating negative voltage by means of diode and capacitor in parallel is solved: firstly, if the charging current is small in the on process, the desired negative voltage value cannot be provided if the appropriate capacitor cannot be selected, and secondly, the off level will gradually become high due to the discharge of the capacitor at the end of the off process, and is no longer a stable negative voltage, which will affect the driving reliability;

[0053] 3. The transformer alternately outputs positive and negative voltages in positive and negative half cycles, and is balanced in work. A single transformer can output two isolated positive and negative driving voltages, the output voltage is stable and easy to configure, and can be compatible with driving voltages of different models of SICMOS;

[0054] 4. The winding method of the transformer is a combination of sandwich and parallel winding, so that the consistency of the two power supplies is better.

[0055] Embodiment 2

[0056] The embodiment provides a driving method applied to an energy bidirectional flow device, adopts the driving power supply circuit applied to the energy bidirectional flow device as described in the embodiment 1, and comprises the following steps of:

[0057] The working condition of the present application is as follows: the PWM control chip outputs two fixed frequency PWM waveforms with a duty cycle of 50% and a dead zone, the two waveforms are 180° different from each other, and the amplitude is consistent with the power supply voltage Vcc. The two PWMs are connected to the primary winding of the transformer through the DC blocking capacitor C9, and the DC blocking capacitor C9 can work at the same end or different end. The secondary winding has two circuits, and each winding is connected to two rectifier circuits to output positive and negative voltages.

[0058] The specific working mode is as follows: when the primary winding is in the positive half cycle (for example, Figure 5 ), the same end 2 of the primary winding is high, the same end 10 in the first secondary winding subcircuit senses a high level, is rectified through the second diode D2, the second capacitor C2 and the third capacitor C3, and then returns to the winding 9, and a positive voltage (+VA, 0VA) is output through the first resistor R1 and the first zener D1; at the same time, the same end 7 in the second secondary winding subcircuit senses a high level, is rectified through the fifteenth capacitor C15, the sixteenth capacitor C16 and the sixth diode D6, and then returns to the winding 6, and a negative voltage (-VB, 0VB) is output through the seventh resistor R7 and the fifth zener D5.

[0059] When the primary winding is in the negative half cycle (for example, Figure 6), the opposite end 4 of the primary winding is high level, the opposite end 9 of the first secondary winding sub-circuit senses high level, and after rectification by the seventh capacitor C7, the eighth capacitor C8 and the fourth diode D4, it returns to the winding 10, and through the fifth resistor R5 and the third voltage stabilizing tube D3, a negative voltage (-VA, 0VA) is output; at the same time, the opposite end 6 of the second secondary winding sub-circuit senses high level, and after rectification by the eighth diode D8, the twenty-first capacitor C21 and the twenty-second capacitor C22, it returns to the winding 7, and through the tenth resistor R10 and the seventh voltage stabilizing tube D7, a negative voltage (+VB, 0VB) is output.

[0060] Thus, two isolated positive and negative power supplies are generated, and in a switching cycle, one winding outputs positive power supply and the other winding outputs negative power supply to work alternately, so as to ensure the balance of the transformer working. Through the configuration of the voltage stabilizing tube and the current limiting resistor, any positive and negative power supply for driving SICMOS can be obtained.

[0061] Embodiment 3

[0062] As shown in Figure 7 , this embodiment is based on embodiment 1, and the PWM generator can also directly send a low voltage domain PWM by the MCU, and a high level PWM excitation signal is output by the driving chip. When this mode is used, the generation of the driving power supply can be controlled by the MCU, which is conducive to reducing the standby power consumption.

[0063] As shown in Figure 8 , if the PWM excitation signal is generated by the MCU and the driving chip, it needs to be connected to the same end 2 of the primary winding of the transformer through the direct current blocking capacitor C9, and the opposite end 2 is connected to the system GND. In this case, the direct current blocking capacitor C9 is needed to convert the unipolar PWM output by the driving chip into a bipolar PWM across the primary winding of the transformer, and the working mode of the secondary winding of the transformer is consistent with the above. At this time, attention should be paid to adjusting the turns ratio of the transformer. The excitation signal of the primary winding of the transformer is one half of the previous one, so the turns ratio of the secondary winding to the primary winding needs to be doubled.

[0064] The mode of using the MCU to construct the PWM generator has the feature of controllable output voltage, which is helpful to reduce the standby power consumption; the output of the driving power supply can be controlled by the MCU signal, so as to reduce the power consumption of the whole system when the device is in standby.

[0065] The above only describes the preferred embodiments of the present embodiment and is not used to limit the present embodiment. For those skilled in the art, the present embodiment can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. A drive power supply circuit for a bidirectional energy flow device, characterized in that, This includes a pulse width modulation generator circuit, a transformer, and a rectifier circuit connected in sequence; The pulse width modulation generator circuit is connected to the input terminal of the primary winding circuit of the transformer via a DC blocking capacitor. The secondary winding circuit of the transformer includes a positive output circuit and a negative output circuit; the rectifier circuit is connected in parallel to both the positive output circuit and the negative output circuit. The rectifier circuit includes a current-limiting resistor and a Zener diode connected to each other. The positive output circuit and the negative output circuit are respectively connected in parallel with the circuit after the current-limiting resistor and the Zener diode are connected. It also includes a capacitor, with the positive terminal of the capacitor connected to the cathode of the Zener diode and the negative terminal connected to the anode of the Zener diode. The pulse width modulation generator circuit includes at least a control chip, and the two output pins of the control chip are respectively connected to the second resistor and the eleventh resistor. The end of the second resistor furthest from the control chip is connected to the base of both the first transistor and the second transistor. The collector of the first transistor is connected to the power supply voltage. The emitter of the first transistor is connected to the emitter of the second transistor, and a first pulse width modulation signal is output to the outside. The end of the eleventh resistor furthest from the control chip is connected to the base of both the third and fourth transistors. The collector of the third transistor is connected to the power supply voltage. The emitter of the third transistor is connected to the emitter of the fourth transistor, and outputs a second pulse width modulation signal. The transformer includes a primary winding coil and two secondary winding coils, with all three winding coils wound together on the same magnetic core. The winding method is as follows: the two secondary winding coils are wound together multiple times, then the three winding coils are wound together multiple times, and finally the two secondary winding coils are wound together multiple times again.

2. The drive power supply circuit for a bidirectional energy flow device as described in claim 1, characterized in that, The first pulse width modulation signal and the second pulse width modulation signal are 180° apart.

3. The drive power supply circuit for a bidirectional energy flow device as described in claim 1, characterized in that, A first capacitor is connected in parallel between the first transistor and the power supply voltage, and a seventeenth capacitor is connected in parallel between the third transistor and the power supply voltage; both the first capacitor and the seventeenth capacitor are energy storage capacitors.

4. The drive power supply circuit for a bidirectional energy flow device as described in claim 1, characterized in that, The primary winding circuit of the transformer is such that the output terminal of the first pulse width modulation signal is connected to the same-name terminal of the primary winding of the transformer through a DC blocking capacitor, and the opposite-name terminal is connected to the output terminal of the second pulse width modulation signal.

5. The drive power supply circuit for a bidirectional energy flow device as described in claim 1, characterized in that, The secondary winding circuit of a transformer includes a first secondary winding sub-circuit and a second secondary winding sub-circuit; In the first secondary winding sub-circuit, the same-name terminal is connected to the anode of the second diode and the cathode of the fourth diode. The cathode of the second diode is simultaneously connected to the positive terminals of the second capacitor and the third capacitor. The negative terminals of the second capacitor and the third capacitor are connected to the opposite-name terminal. The anode of the fourth diode is simultaneously connected to the negative terminals of the seventh capacitor and the eighth capacitor. The positive terminals of the seventh capacitor and the eighth capacitor are connected to the opposite-name terminal. In the second secondary winding sub-circuit, the opposite-name terminal is connected to the anode of the eighth diode and the cathode of the sixth diode. The cathode of the eighth diode is simultaneously connected to the positive terminals of the twenty-first and twenty-second capacitors, and the negative terminals of the twenty-first and twenty-second capacitors are connected to the same-name terminal. The anode of the sixth diode is simultaneously connected to the negative terminals of the fifteenth and sixteenth capacitors, and the positive terminals of the fifteenth and sixteenth capacitors are connected to the same-name terminal.

6. The drive power supply circuit for a bidirectional energy flow device as described in claim 5, characterized in that, The second diode, the fourth diode, the eighth diode, and the sixth diode are all rectifier diodes.

7. The drive power supply circuit for a bidirectional energy flow device as described in claim 5, characterized in that, In the rectifier circuit, one end of the first resistor used for current limiting is connected to the cathode of the second diode, and the other end is connected to the cathode of the first Zener diode. The anode of the first Zener diode is connected to an opposite terminal of the first secondary winding sub-circuit. The circuit also includes a fourth capacitor, the positive terminal of which is connected to the cathode of the first Zener diode, and the negative terminal of which is connected to the anode of the first Zener diode, and outputs a positive driving power supply. The fifth resistor used for current limiting is connected at one end to the opposite terminal in the first secondary winding sub-circuit, and at the other end to the cathode of the third Zener diode. The anode of the third Zener diode is connected to the anode of the fourth diode. The system also includes a sixth capacitor, the positive terminal of which is connected to the cathode of the third Zener diode, and the negative terminal of which is connected to the anode of the third Zener diode, and outputs a negative power supply for driving. The seventh resistor used for current limiting is connected at one end to the same-name terminal in the second secondary winding sub-circuit, and at the other end to the cathode of the fifth Zener diode. The anode of the fifth Zener diode is connected to the anode of the sixth diode. It also includes a thirteenth capacitor. The positive terminal of the thirteenth capacitor is connected to the cathode of the fifth Zener diode, and the negative terminal is connected to the anode of the fifth Zener diode, and outputs a negative power supply to drive it. The tenth resistor, used for current limiting, is connected at one end to the cathode of the eighth diode and at the other end to the cathode of the seventh Zener diode. The anode of the seventh Zener diode is connected to the same terminal in the second secondary winding sub-circuit. The system also includes a twentieth capacitor, whose positive terminal is connected to the cathode of the seventh Zener diode and its negative terminal is connected to the anode of the seventh Zener diode, outputting a positive driving power supply.

8. A driving method applied to a bidirectional energy flow device, characterized in that, The drive power supply circuit for a bidirectional energy flow device as described in any one of claims 1-7 is included: The first pulse width modulation signal and the second pulse width modulation signal are connected to the primary winding circuit of the transformer through a DC blocking capacitor. The DC blocking capacitor can function at both the same-name terminal and the opposite-name terminal. During the positive half-cycle of the primary winding, the corresponding terminal of the primary winding is at a high level. The corresponding terminal of the first secondary winding sub-circuit is induced to be at a high level. After rectification by the second diode, the second capacitor, and the third capacitor, the voltage returns to the corresponding terminal of the first secondary winding sub-circuit. The output voltage is configured to be positive through the first resistor and the first Zener diode. At the same time, the corresponding terminal of the second secondary winding sub-circuit is induced to be at a high level. After rectification by the forty-fifth capacitor, the sixteenth capacitor, and the sixth diode, the voltage returns to the corresponding terminal of the first secondary winding sub-circuit. The output voltage is configured to be negative through the seventh resistor and the fifth diode. During the negative half-cycle of the primary winding, the opposite-named terminal of the primary winding is at a high level. The opposite-named terminal in the first secondary winding sub-circuit is induced to have a high level. After rectification by the seventh capacitor, the eighth capacitor, and the fourth diode, the voltage returns to the opposite-named terminal in the first secondary winding sub-circuit. The output voltage is configured to be negative through the fifth resistor and the third Zener diode. At the same time, the opposite-named terminal in the second secondary winding sub-circuit is induced to have a high level. After rectification by the eighth diode, the twenty-first capacitor, and the twenty-second capacitor, the voltage returns to the opposite-named terminal in the second secondary winding sub-circuit. The output voltage is configured to be negative through the tenth resistor and the seventh diode. It generates two isolated positive and negative power supplies, with one winding outputting a positive power supply and the other winding outputting a negative power supply, alternating during the switching cycle.

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