Power supply circuit of power module and half-bridge drive circuit

Abstract

The utility model provides a power module and a power supply circuit of a half-bridge drive circuit, a first output end of a pulse signal generation unit in the power supply circuit outputs a first pulse signal, a second output end of the pulse signal generation unit outputs a second pulse signal, and the first pulse signal and the second pulse signal are complementary signals; the upper tube power supply unit receives the first pulse signal and the second pulse signal, and outputs an upper tube high level signal, an upper tube negative level signal and an upper tube reference zero point signal; the lower tube power supply unit receives the first pulse signal and the second pulse signal, outputs a lower tube high level signal, a lower tube negative level signal and a lower tube reference zero point signal, and can provide power for power supply chips corresponding to an upper tube and a lower tube in the half-bridge drive circuit. And the pulse transformers in the upper tube power supply unit and the lower tube power supply unit in the power supply circuit are mutually independent and do not interfere with each other, a switch tube is not needed, and the voltage withstanding problem of the switch tube does not need to be considered.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, in particular to a power module and a power supply circuit of a half-bridge drive circuit. Background Art

[0002] With the advent of the electrification era, China is vigorously promoting the development of high-power converters, such as those for new energy electric drive systems, shore power systems, and more electric aircraft. The development of high-power converters requires the development of even higher-power intelligent power modules. High-power intelligent power modules require power supplies with greater driving capabilities.

[0003] like Figure 1 As shown, the three-level three-phase VIENNA rectifier currently mainly uses digital chip control and adopts a dual-tube flyback multi-output power supply to drive a high-power module. The inventors have found that this circuit requires the switch tube to have a high voltage resistance or requires multiple switch tubes to be connected in series. It also requires a flyback transformer with a large winding coil, resulting in large leakage inductance and low efficiency due to reverse recovery. Therefore, the circuit cost is high and it is difficult to control. Utility Model Content

[0004] In this regard, the present application provides a power supply circuit of a power module and a half-bridge drive circuit to solve the problem that the existing circuit requires the switching tube to have a higher voltage resistance or requires multiple switching tubes to be connected in series, and requires a flyback transformer with a large winding coil, resulting in a large leakage inductance and low efficiency due to reverse recovery, resulting in high circuit cost and difficulty in control.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] The first aspect of the present application discloses a power supply circuit of a half-bridge drive circuit, comprising: a pulse signal generating unit, an upper tube power supply unit, and a lower tube power supply unit;

[0007] The pulse signal generating unit is connected to the upper tube power supply unit and the lower tube power supply unit respectively;

[0008] The first output terminal of the pulse signal generating unit outputs a first pulse signal, and the second output terminal of the pulse signal generating unit outputs a second pulse signal, wherein the first pulse signal and the second pulse signal are complementary signals;

[0009] The first receiving end of the upper tube power supply unit receives the first pulse signal, the second receiving end of the upper tube power supply unit receives the second pulse signal, the first output end of the upper tube power supply unit outputs an upper tube high level signal, the second output end of the upper tube power supply unit outputs an upper tube negative level signal, and the third output end of the upper tube power supply unit outputs an upper tube reference zero point signal;

[0010] The first receiving end of the lower tube power supply unit receives the first pulse signal, the second receiving end of the lower tube power supply unit receives the second pulse signal, the first output end of the lower tube power supply unit outputs a lower tube high level signal, the second output end of the lower tube power supply unit outputs a lower tube negative level signal, and the third output end of the lower tube power supply unit outputs a lower tube reference zero point signal.

[0011] Optionally, in the power supply circuit of the above-mentioned half-bridge drive circuit, the pulse signal generating unit includes: a first inverter, a second inverter, a third inverter, a fourth inverter, a first diode, a second diode, a first resistor, a second resistor and a first capacitor;

[0012] The anode of the first diode is grounded, the cathode of the first diode is connected to the anode of the second diode, the input end of the first inverter and one end of the first resistor respectively, and the cathode of the second diode is connected to the chip power supply;

[0013] The output end of the first inverter is connected to the input end of the second inverter and one end of the second resistor respectively, and the output end of the second inverter is connected to the input end of the third inverter and one end of the first capacitor respectively;

[0014] The other end of the first resistor is connected to the other end of the second resistor and the other end of the first capacitor respectively;

[0015] The output end of the third inverter is connected to the input end of the fourth inverter, and the connection point serves as the first output end of the pulse signal generating unit, outputting the first pulse signal;

[0016] The output end of the fourth inverter serves as the second output end of the pulse signal generating unit to output the second pulse signal.

[0017] Optionally, in the power supply circuit of the above-mentioned half-bridge driving circuit, the pulse signal generating unit further includes: a second capacitor and a third capacitor;

[0018] The power supply pin of the second inverter is grounded through the second capacitor, and the power supply pin of the fourth inverter is grounded through the third capacitor.

[0019] Optionally, in the power supply circuit of the above-mentioned half-bridge drive circuit, the upper tube power supply unit includes: a first drive chip, a first pulse transformer, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a third resistor, a fourth resistor, a fifth resistor, a third diode, a fourth diode, a fifth diode and a first clamping unit;

[0020] The INA pin of the first driver chip serves as the first input terminal of the upper tube power supply unit to receive the first pulse signal; the INB pin of the first driver chip serves as the second input terminal of the upper tube power supply unit to receive the second pulse signal; the GND pin of the first driver chip is respectively connected to one end of the fourth capacitor and the first end of the first clamping unit and is grounded; the VCC pin of the first driver chip is connected to the other end of the fourth capacitor and is connected to the chip power supply; the OUTA pin of the first driver chip is respectively connected to the second end of the first clamping unit and one end of the third resistor; the OUTB pin of the first driver chip is respectively connected to the third end of the first clamping unit, one end of the fifth capacitor, and one end of the sixth capacitor;

[0021] The other end of the third resistor is connected to the opposite-name terminal of the primary side of the first pulse transformer; the other end of the fifth capacitor is connected to the other end of the sixth capacitor and the same-name terminal of the primary side of the first pulse transformer respectively;

[0022] The secondary side opposite-name terminals of the first pulse transformer are respectively connected to one end of the seventh capacitor and one end of the eighth capacitor; the other end of the seventh capacitor is respectively connected to the other end of the eighth capacitor, the anode of the third diode, and the cathode of the fourth diode;

[0023] The secondary side like-named terminals of the first pulse transformer are respectively connected to the anode of the fourth diode and one end of the ninth capacitor, one end of the fourth resistor, the anode of the fifth diode and one end of the tenth capacitor, and the connection points serve as the second output terminal of the upper tube power supply unit, outputting the negative level signal of the upper tube;

[0024] The cathode of the third diode is connected to the other end of the ninth capacitor, the other end of the fourth resistor, and one end of the fifth resistor, respectively, and the connection points serve as the first output end of the upper tube power supply unit to output the high-level signal of the upper tube;

[0025] The other end of the fifth resistor is connected to the cathode of the fifth diode and the other end of the tenth capacitor respectively, and the connection point serves as the third output end of the upper tube power supply unit to output the upper tube reference zero point signal.

[0026] Optionally, in the power supply circuit of the above-mentioned half-bridge driving circuit, the first clamping unit includes: a sixth diode, a seventh diode, an eighth diode and a ninth diode;

[0027] The anode of the sixth diode is connected to the anode of the ninth diode, and the connection point serves as the first end of the first clamping unit;

[0028] The cathode of the sixth diode is connected to the anode of the seventh diode, and the connection point serves as the second end of the first clamping unit;

[0029] The cathode of the seventh diode is connected to the cathode of the eighth diode and connected to the chip power supply; the anode of the eighth diode is connected to the cathode of the ninth diode, and the connection point serves as the third end of the first clamping unit.

[0030] Optionally, in the power supply circuit of the above-mentioned half-bridge drive circuit, the third diode is a rectifier diode, the fourth diode is a freewheeling diode, and the fifth diode is a voltage regulator diode.

[0031] Optionally, in the power supply circuit of the above-mentioned half-bridge drive circuit, the lower tube power supply unit includes: a second drive chip, a second pulse transformer, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, a sixth resistor, a seventh resistor, an eighth resistor, a tenth diode, an eleventh diode, a twelfth diode, and a second clamping unit;

[0032] The INA pin of the second driver chip serves as the first input terminal of the lower tube power supply unit to receive the first pulse signal; the INB pin of the second driver chip serves as the second input terminal of the lower tube power supply unit to receive the second pulse signal; the GND pin of the second driver chip is respectively connected to one end of the eleventh capacitor and the first end of the second clamping unit and is grounded; the VCC pin of the second driver chip is connected to the other end of the eleventh capacitor and is connected to the chip power supply; the OUTA pin of the second driver chip is respectively connected to the second end of the second clamping unit and one end of the sixth resistor; the OUTB pin of the second driver chip is respectively connected to the third end of the second clamping unit, one end of the twelfth capacitor, and one end of the thirteenth capacitor;

[0033] The other end of the sixth resistor is connected to the opposite-name terminal of the primary side of the second pulse transformer; the other end of the twelfth capacitor is connected to the other end of the thirteenth capacitor and the same-name terminal of the primary side of the second pulse transformer respectively;

[0034] The secondary side opposite-name terminals of the second pulse transformer are respectively connected to one end of the fourteenth capacitor and one end of the fifteenth capacitor; the other end of the fourteenth capacitor is respectively connected to the other end of the fifteenth capacitor, the anode of the tenth diode, and the cathode of the eleventh diode;

[0035] The secondary side like-named terminals of the second pulse transformer are respectively connected to the anode of the eleventh diode, one end of the sixteenth capacitor, one end of the seventh resistor, the anode of the twelfth diode, and one end of the seventeenth capacitor, and the connection points serve as the second output terminal of the lower tube power supply unit, outputting the negative level signal of the lower tube;

[0036] The cathode of the tenth diode is connected to the other end of the sixteenth capacitor, the other end of the seventh resistor, and one end of the eighth resistor, respectively, and the connection points serve as the first output end of the lower tube power supply unit to output the high-level signal of the lower tube;

[0037] The other end of the eighth resistor is connected to the cathode of the twelfth diode and the other end of the seventeenth capacitor respectively, and the connection point serves as the third output end of the lower tube power supply unit to output the lower tube reference zero point signal.

[0038] Optionally, in the power supply circuit of the above-mentioned half-bridge driving circuit, the second clamping unit includes: a thirteenth diode, a fourteenth diode, a fifteenth diode and a sixteenth diode;

[0039] The anode of the thirteenth diode is connected to the anode of the sixteenth diode, and the connection point serves as the first end of the second clamping unit;

[0040] The cathode of the thirteenth diode is connected to the anode of the fourteenth diode, and the connection point serves as the second end of the second clamping unit;

[0041] The cathode of the fourteenth diode is connected to the cathode of the fifteenth diode and is connected to the chip power supply; the anode of the fifteenth diode is connected to the cathode of the sixteenth diode, and the connection point serves as the third end of the second clamping unit.

[0042] Optionally, in the power supply circuit of the above-mentioned half-bridge drive circuit, the tenth diode is a rectifier diode, the eleventh diode is a freewheeling diode, and the twelfth diode is a voltage regulator diode.

[0043] The second aspect of the present application discloses a power module, comprising: at least one half-bridge drive circuit, wherein the half-bridge drive circuit is used to drive the corresponding power tube in the power module, and the half-bridge drive circuit supplies power to the corresponding drive chip in itself through the power supply circuit of any half-bridge drive circuit disclosed in the first aspect.

[0044] The utility model provides a power supply circuit of a half-bridge drive circuit, comprising: a pulse signal generating unit, an upper tube power supply unit and a lower tube power supply unit; the pulse signal generating unit is connected to the upper tube power supply unit and the lower tube power supply unit respectively; a first output end of the pulse signal generating unit outputs a first pulse signal, a second output end of the pulse signal generating unit outputs a second pulse signal, and the first pulse signal and the second pulse signal are complementary signals; a first receiving end of the upper tube power supply unit receives the first pulse signal, a second receiving end of the upper tube power supply unit receives the second pulse signal, the first output end of the upper tube power supply unit outputs an upper tube high level signal, the second output end of the upper tube power supply unit outputs an upper tube negative level signal, and the third output end of the upper tube power supply unit outputs an upper tube reference zero point signal; a first receiving end of the lower tube power supply unit receives the first pulse signal, a second receiving end of the upper tube power supply unit receives the second pulse signal, a first output end of the upper tube power supply unit outputs an upper tube high level signal, a second output end of the upper tube power supply unit outputs an upper tube negative level signal, and a ... receiving end of the upper tube power supply unit receives the second pulse signal, a first receiving end of the upper tube power supply unit receives the second pulse signal, a first receiving end of the upper tube power supply unit receives the second pulse signal, a first receiving end of the upper tube power supply unit receives the second pulse signal, a first receiving end of the upper tube power supply unit receives The first receiving end receives the first pulse signal, the second receiving end of the lower tube power supply unit receives the second pulse signal, the first output end of the lower tube power supply unit outputs a high-level signal for the lower tube, the second output end of the lower tube power supply unit outputs a negative-level signal for the lower tube, and the third output end of the lower tube power supply unit outputs a reference zero point signal for the lower tube. It can provide power for the power supply chips corresponding to the upper tube and the lower tube in the half-bridge drive circuit, and the pulse transformers in the upper tube power supply unit and the lower tube power supply unit in the power supply circuit are independent of each other and do not interfere with each other. There is no need for a switching tube, and there is no need to consider the voltage resistance of the switching tube. This solves the problem that the existing circuit requires the switching tube to have a higher voltage resistance or requires multiple switching tubes to be connected in series, and requires a flyback transformer with a large winding coil, resulting in a large leakage inductance and low efficiency due to reverse recovery, resulting in high circuit cost and difficulty in control. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0046] Figure 1 A power supply circuit of an existing driving circuit provided in an embodiment of the present application;

[0047] Figure 2 A schematic structural diagram of a power supply circuit of a half-bridge drive circuit provided in an embodiment of the present application;

[0048] Figure 3 A circuit diagram of a power supply circuit of a half-bridge drive circuit provided in an embodiment of the present application;

[0049] Figure 4 A waveform diagram of a sawtooth signal, a first pulse signal, and a second pulse signal provided in an embodiment of the present application;

[0050] Figure 5 A circuit diagram of a power supply circuit of another half-bridge drive circuit provided in an embodiment of the present application;

[0051] Figure 6 Another power supply circuit of an existing driving circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0053] The embodiments of the present application provide a power supply circuit for a power module and a half-bridge drive circuit to solve the problems that existing circuits require a higher voltage resistance of the switching tube, or require multiple switching tubes to be connected in series, and require a flyback transformer with a large winding coil, resulting in large leakage inductance and low efficiency due to reverse recovery, resulting in high circuit cost and difficulty in control.

[0054] See Figure 2 The power supply circuit of the half-bridge driving circuit mainly includes: a pulse signal generating unit 101, an upper tube power supply unit 102 and a lower tube power supply unit 103;

[0055] The pulse signal generating unit 101 is connected to the upper tube power supply unit 102 and the lower tube power supply unit 103 respectively;

[0056] The first output terminal of the pulse signal generating unit 101 outputs a first pulse signal, and the second output terminal of the pulse signal generating unit 101 outputs a second pulse signal, and the first pulse signal and the second pulse signal are complementary signals;

[0057] In practical applications, the pulse signal generating circuit is used to generate a sawtooth signal through self-oscillation, and to generate a first pulse signal and a second pulse signal according to the sawtooth signal.

[0058] In some embodiments, as Figure 3 As shown, the pulse signal generating unit 101 mainly includes: a first inverter U30B, a second inverter U30A, a third inverter U31B, a fourth inverter U31A, a first diode D1, a second diode D2, a first resistor R1, a second resistor R2 and a first capacitor C1;

[0059] The anode of the first diode D1 is grounded ( Figure 3The cathode of the first diode D1 is connected to the anode of the second diode D2, the input end of the first inverter U30B and one end of the first resistor R1 respectively, and the connection point (A in the figure) generates a sawtooth signal; the cathode of the second diode D2 is connected to the chip power supply ( Figure 3 VCC in the MOSFET);

[0060] The output end of the first inverter U30B is connected to the input end of the second inverter U30A and one end of the second resistor R2 respectively, and the output end of the second inverter U30A is connected to the input end of the third inverter U31B and one end of the first capacitor C1 respectively;

[0061] The other end of the first resistor R1 is connected to the other end of the second resistor R2 and the other end of the first capacitor C1 respectively;

[0062] The output end of the third inverter U31B is connected to the input end of the fourth inverter U31A, and the connection point (B in the figure) serves as the first output end of the pulse signal generating unit 101, outputting the first pulse signal;

[0063] The output terminal (C in the figure) of the fourth inverter U31A serves as the second output terminal of the pulse signal generating unit 101 to output the second pulse signal.

[0064] It should be noted that the first diode D1 and the second diode D2 are mainly used to achieve clamping protection of the subsequent inverter; the first inverter U30B, the second inverter U30A, the first resistor R1, the second resistor R2 and the first capacitor C1 constitute a second-order multivibrator circuit, which can generate a sawtooth signal at the common end of the first diode D1, the second diode D2, the first inverter U30B and the first resistor R1 by self-oscillation, that is, RC charging and discharging. For example, Figure 4 As shown, the sawtooth signal is V A Signal.

[0065] In actual applications, in the pulse signal generating unit 101, the sawtooth signal is processed by the first inverter U30B, the second inverter U30A, the third inverter U31B and the fourth inverter U31A, and a first pulse signal can be generated at the output end of the third inverter U31B, and a second pulse signal can be generated at the output end of the fourth inverter U31A.

[0066] For example, Figure 4 As shown, the first pulse signal is V B signal; the second pulse signal is V C Signal.

[0067] It should also be noted that the chip power supply can provide power for each inverter in the pulse signal generating unit 101 and provide an energy source for the auxiliary power supply.

[0068] In some embodiments, as Figure 5 As shown, the pulse signal generating unit 101 may further include: a second capacitor C2 and a third capacitor C3;

[0069] A power pin of the second inverter U30A is grounded via a second capacitor C2 , and a power pin of the fourth inverter U31A is grounded via a third capacitor C3 .

[0070] In actual applications, the purpose of setting the second capacitor C2 to be grounded at the power pin of the second inverter U30A is to achieve filtering; similarly, the purpose of setting the third capacitor C3 to be grounded at the power pin of the fourth inverter U31A is also to achieve filtering; by filtering the power supply input to the second inverter U30A and the fourth inverter U31A, the reliability of the first pulse signal and the second pulse signal generated in the pulse signal generating unit 101 can be further improved, and the reliability of the power circuit of the half-bridge drive circuit in providing power to the half-bridge drive circuit can also be further improved.

[0071] The first receiving end of the upper tube power supply unit 102 receives the first pulse signal, the second receiving end of the upper tube power supply unit 102 receives the second pulse signal, the first output end of the upper tube power supply unit 102 outputs the upper tube high level signal, the second output end of the upper tube power supply unit 102 outputs the upper tube negative level signal, and the third output end of the upper tube power supply unit 102 outputs the upper tube reference zero point signal;

[0072] In practical applications, the upper tube power supply unit 102 is used to generate an upper tube high level signal, an upper tube negative level signal and an upper tube reference zero point signal according to the first pulse signal and the second pulse signal.

[0073] Specifically, the upper tube high level signal, the upper tube negative level signal and the upper tube reference zero point signal are respectively connected to the corresponding pins of the corresponding driver chip in the half-bridge driver circuit, thereby realizing power supply to the corresponding driver chip in the half-bridge driver circuit.

[0074] In some embodiments, as Figure 3 As shown, the upper tube power supply unit 102 may include: a first driver chip U39, a first pulse transformer T5, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a third diode D3, a fourth diode D4, a fifth diode D5 and a first clamping unit 2011;

[0075] The INA pin of the first driver chip U39 serves as the first input terminal of the upper tube power supply unit 102 and receives the first pulse signal; the INB pin of the first driver chip U39 serves as the second input terminal of the upper tube power supply unit 102 and receives the second pulse signal; the GND pin of the first driver chip U39 is respectively connected to one end of the fourth capacitor C4 and the first end of the first clamping unit 2011 and is grounded; the VCC pin of the first driver chip U39 is connected to the other end of the fourth capacitor C4 and is connected to the chip power supply; the OUTA pin of the first driver chip U39 is respectively connected to the second end of the first clamping unit 2011 and one end of the third resistor R3; the OUTB pin of the first driver chip U39 is respectively connected to the third end of the first clamping unit 2011, one end of the fifth capacitor C5 and one end of the sixth capacitor C6;

[0076] The other end of the third resistor R3 is connected to the opposite-name terminal of the primary side of the first pulse transformer T5; the other end of the fifth capacitor C5 is connected to the other end of the sixth capacitor C6 and the same-name terminal of the primary side of the first pulse transformer T5 respectively;

[0077] The secondary side opposite-polarity terminals of the first pulse transformer T5 are connected to one end of the seventh capacitor C7 and one end of the eighth capacitor C8, respectively; the other end of the seventh capacitor C7 is connected to the other end of the eighth capacitor C8, the anode of the third diode D3, and the cathode of the fourth diode D4, respectively;

[0078] The secondary side of the first pulse transformer T5 has the same-name terminal connected to the anode of the fourth diode D4 and one end of the ninth capacitor C9, one end of the fourth resistor R4, the anode of the fifth diode D5 and one end of the tenth capacitor C10, respectively. The connection points serve as the second output terminal of the upper tube power supply unit 102, outputting the upper tube negative level signal (VNEG_WH in the figure);

[0079] The cathode of the third diode D3 is connected to the other end of the ninth capacitor C9, the other end of the fourth resistor R4, and one end of the fifth resistor R5, respectively. The connection points serve as the first output end of the upper tube power supply unit 102, outputting the upper tube high-level signal (VDD_WH in the figure);

[0080] The other end of the fifth resistor R5 is connected to the cathode of the fifth diode D5 and the other end of the tenth capacitor C10 respectively, and the connection point serves as the third output end of the upper tube power supply unit 102, outputting the upper tube reference zero point signal (VE_WH in the figure).

[0081] In actual applications, the first driver chip U39 can amplify the first pulse signal and the second pulse signal to generate complementary level signals, and then generate a pulse level signal on the secondary side of the first pulse transformer T5 through the coupling of the fifth capacitor C5 and the sixth capacitor C6 and the isolation of the primary and secondary sides of the first pulse transformer T5. Then, through the coupling of the seventh capacitor C7 and the eighth capacitor C8, the rectification of the third diode D3, the smoothing filtering of the ninth capacitor C9 and the freewheeling of the fourth diode D4, a smooth and stable upper tube high-level signal is formed; wherein, the upper tube high-level signal is a DC drive power supply, which can be supplied to the corresponding driver chip in the half-bridge drive circuit.

[0082] Furthermore, the fifth resistor R5 and the fifth diode D5 in the upper tube power supply unit 102 can clamp a low-voltage level signal, namely the upper tube negative level signal mentioned above. In actual applications, the upper tube negative level signal is lower than the driving power level signal of the corresponding driver chip in the half-bridge driver circuit. The upper tube high level signal and the upper tube negative level signal together form the driving power supply of the corresponding driver chip in the half-bridge driver circuit.

[0083] In addition, the upper tube reference zero point signal generated by the common end of the fifth resistor R5, the fifth diode D5 and the tenth capacitor C10 can be connected to the corresponding pin of the corresponding driver chip in the half-bridge driver circuit to provide a reference zero point for the driver chip.

[0084] It should also be noted that the fifth capacitor C5 and the sixth capacitor C6 are connected in parallel and form an LC oscillator circuit with the primary coil of the first pulse transformer T5. The AC current of the fifth capacitor C5 and the sixth capacitor C6 can be used to isolate the DC current, thereby preventing magnetic saturation of the primary coil of the first pulse transformer T5. The secondary coil of the first pulse transformer T5 can receive the pulse signal generated by the primary coil of the first pulse transformer T5, and the high-frequency pulse can be coupled through the seventh capacitor C7 and the eighth capacitor C8. Among them, the first pulse transformer T5 mainly plays the role of isolation and energy transmission in the upper tube power supply unit 102.

[0085] In some embodiments, the third diode D3 can be a rectifier diode, the fourth diode D4 can be a freewheeling diode, and the fifth diode D5 can be a voltage regulator. The rectification of the second diode D2 and the freewheeling of the fourth diode D4 can convert the pulse rectified wave into direct current, providing a DC drive power supply for the corresponding driver chip in the half-bridge drive circuit. The fourth diode D4 can also provide a freewheeling circuit.

[0086] In actual applications, the role of the fourth capacitor C4 in the upper tube power supply unit 102 is filtering and energy storage. The role of the third resistor R3 in the upper tube power supply unit 102 is to limit the current of the OUTA pin of the first driver chip U39, protect the OUTA pin of the first driver chip U39, and avoid excessive pulse current from burning the first driver chip U39. The role of the fourth resistor R4 in the upper tube power supply unit 102 is a dummy load. Because the power supply circuit of the half-bridge drive circuit is an open-loop power supply, setting a dummy load can prevent power supply fluctuations. The fifth resistor R5 in the upper tube power supply unit 102 is a current limiting resistor, and the ninth capacitor C9 is a filter capacitor. When the fifth diode D5 is a voltage regulator, the negative level signal of the upper tube can be clamped by the fifth diode D5 to provide a shutdown power supply for the corresponding driver chip in the half-bridge drive circuit.

[0087] In some embodiments, as Figure 5 As shown, the first clamping unit 2011 may include: a sixth diode D6, a seventh diode D7, an eighth diode D8 and a ninth diode D9;

[0088] The anode of the sixth diode D6 is connected to the anode of the ninth diode D9, and the connection point serves as the first end of the first clamping unit 2011; the cathode of the sixth diode D6 is connected to the anode of the seventh diode D7, and the connection point serves as the second end of the first clamping unit 2011; the cathode of the seventh diode D7 is connected to the cathode of the eighth diode D8 and connected to the chip power supply; the anode of the eighth diode D8 is connected to the cathode of the ninth diode D9, and the connection point serves as the third end of the first clamping unit 2011.

[0089] In practical applications, the sixth diode D6, the seventh diode D7, the eighth diode D8 and the ninth diode D9 can clamp the pulse level signals generated by the OUTA pin and the OUTB pin of the first driver chip U39 between the chip power supply and the ground, thereby playing a protective role.

[0090] The first receiving end of the lower tube power supply unit 103 receives the first pulse signal, the second receiving end of the lower tube power supply unit 103 receives the second pulse signal, the first output end of the lower tube power supply unit 103 outputs a low-level signal for the lower tube, the second output end of the lower tube power supply unit 103 outputs a low-level signal for the lower tube, and the third output end of the lower tube power supply unit 103 outputs a reference zero point signal for the lower tube.

[0091] In practical applications, the lower tube power supply unit 103 is used to generate a lower tube high level signal, a lower tube negative level signal and a lower tube reference zero point signal according to the first pulse signal and the second pulse signal.

[0092] Specifically, the lower tube high level signal, the lower tube negative level signal and the lower tube reference zero point signal are respectively connected to the corresponding pins of the corresponding driver chip in the half-bridge driver circuit, thereby realizing power supply to the corresponding driver chip in the half-bridge driver circuit.

[0093] In some embodiments, as Figure 3 As shown, the lower tube power supply unit 103 mainly includes: a second driving chip U40, a second pulse transformer T6, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, a sixteenth capacitor C16, a seventeenth capacitor C17, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a tenth diode D10, an eleventh diode D11, a twelfth diode D12 and a second clamping unit 2012;

[0094] The INA pin of the second driver chip U40 serves as the first input terminal of the lower tube power supply unit 103, receiving the first pulse signal; the INB pin of the second driver chip U40 serves as the second input terminal of the lower tube power supply unit 103, receiving the second pulse signal; the GND pin of the second driver chip U40 is respectively connected to one end of the eleventh capacitor C11 and the first end of the second clamping unit 2012 and grounded; the VCC pin of the second driver chip U40 is connected to the other end of the eleventh capacitor C11 and connected to the chip power supply; the OUTA pin of the second driver chip U40 is respectively connected to the second end of the second clamping unit 2012 and one end of the sixth resistor R6; the OUTB pin of the second driver chip U40 is respectively connected to the third end of the second clamping unit 2012, one end of the twelfth capacitor C12, and one end of the thirteenth capacitor C13;

[0095] The other end of the sixth resistor R6 is connected to the opposite-name terminal of the primary side of the second pulse transformer T6; the other end of the twelfth capacitor C12 is connected to the other end of the thirteenth capacitor C13 and the same-name terminal of the primary side of the second pulse transformer T6 respectively;

[0096] The secondary side opposite-polarity terminals of the second pulse transformer T6 are connected to one end of a fourteenth capacitor C14 and one end of a fifteenth capacitor C15, respectively; the other end of the fourteenth capacitor C14 is connected to the other end of the fifteenth capacitor C15, the anode of the tenth diode D10, and the cathode of the eleventh diode D11, respectively;

[0097] The secondary side of the second pulse transformer T6 has the same-name terminal connected to the anode of the eleventh diode D11, one end of the sixteenth capacitor C16, one end of the seventh resistor R7, the anode of the twelfth diode D12, and one end of the seventeenth capacitor C17, respectively. The connection points serve as the second output terminal of the lower tube power supply unit 103, outputting the lower tube negative level signal (VNEG_WL in the figure);

[0098] The cathode of the tenth diode D10 is respectively connected to the other end of the sixteenth capacitor C16, the other end of the seventh resistor R7, and one end of the eighth resistor R8. The connection points serve as the first output end of the lower tube power supply unit 103, outputting the lower tube high-level signal (VDD_WL in the figure);

[0099] The other end of the eighth resistor R8 is connected to the cathode of the twelfth diode D12 and the other end of the seventeenth capacitor C17 respectively, and the connection point serves as the third output end of the lower tube power supply unit 103, outputting the lower tube reference zero point signal (VE_WL in the figure).

[0100] In actual applications, the principle is the same as that of the above-mentioned upper tube power supply unit 102. The second driver chip U40 can amplify the first pulse signal and the second pulse signal to generate complementary level signals, and then through the coupling of the twelfth capacitor C12 and the thirteenth capacitor C13 and the isolation of the primary and secondary sides of the second pulse transformer T6, a pulse level signal is generated on the secondary side of the second pulse transformer T6, and then through the coupling of the fourteenth capacitor C14 and the fifteenth capacitor C15, the rectification of the tenth diode D10, the smoothing filtering of the sixteenth capacitor C16 and the freewheeling of the eleventh diode D11 to form a smooth and stable upper tube high-level signal; wherein, the upper tube high-level signal is a DC drive power supply, which can be supplied to the corresponding driver chip in the half-bridge drive circuit.

[0101] Furthermore, the eighth resistor R8 and the twelfth diode D12 in the lower tube power supply unit 103 can clamp a low-voltage level signal, namely the aforementioned lower tube negative level signal. In practical applications, the lower tube negative level signal is lower than the drive power level signal of the corresponding driver chip in the half-bridge driver circuit. The lower tube high level signal and the lower tube negative level signal together form the drive power supply for the corresponding driver chip in the half-bridge driver circuit.

[0102] In addition, the lower tube reference zero point signal generated by the common end of the eighth resistor R8, the twelfth diode D12 and the seventeenth capacitor C17 can be connected to the corresponding pin of the corresponding driver chip in the half-bridge driver circuit to provide a reference zero point for the driver chip.

[0103] It should also be noted that the twelfth capacitor C12 and the thirteenth capacitor C13 are connected in parallel and form an LC oscillating circuit with the primary coil of the second pulse transformer T6. The AC between the twelfth capacitor C12 and the thirteenth capacitor C13 can isolate the DC, thereby preventing magnetic saturation of the primary coil of the second pulse transformer T6. The secondary coil of the second pulse transformer T6 can receive the pulse signal generated by the primary coil of the second pulse transformer T6, and the high-frequency pulse can be coupled through the fourteenth capacitor C14 and the fifteenth capacitor C15. Among them, the second pulse transformer T6 mainly plays the role of isolation and energy transmission in the lower tube power supply unit 103.

[0104] In some embodiments, the tenth diode D10 is a rectifier diode, the eleventh diode D11 is a freewheeling diode, and the twelfth diode D12 is a voltage regulator. The rectification of the tenth diode D10 and the freewheeling of the eleventh diode D11 can convert the pulse rectified wave into direct current, providing a DC drive power supply for the corresponding driver chip in the half-bridge drive circuit. The eleventh diode D11 also provides a freewheeling circuit.

[0105] In practical applications, the eleventh capacitor C11 in the lower tube power supply unit 103 serves as filtering and energy storage. The sixth resistor R6 in the lower tube power supply unit 103 serves as current limiting for the OUTA pin of the second driver chip U40, protecting the OUTA pin of the second driver chip U40 and preventing excessive pulse current from burning out the second driver chip U40. The seventh resistor R7 in the lower tube power supply unit 103 serves as a dummy load, because the power supply circuit of the half-bridge drive circuit is an open-loop power supply, and setting a dummy load can prevent power supply fluctuations. The eighth resistor R8 in the lower tube power supply unit 103 is a current limiting resistor, and the sixteenth capacitor C16 is a filter capacitor. When the twelfth diode D12 is a voltage regulator, the twelfth diode D12 can clamp the negative level signal of the lower tube to provide a shutdown power supply for the corresponding driver chip in the half-bridge drive circuit.

[0106] In some embodiments, as Figure 5 As shown, the second clamping unit 2012 may include: a thirteenth diode D13, a fourteenth diode D14, a fifteenth diode D15 and a sixteenth diode D16;

[0107] The anode of the thirteenth diode D13 is connected to the anode of the sixteenth diode D16, and the connection point serves as the first end of the second clamping unit 2012; the cathode of the thirteenth diode D13 is connected to the anode of the fourteenth diode D14, and the connection point serves as the second end of the second clamping unit 2012; the cathode of the fourteenth diode D14 is connected to the cathode of the fifteenth diode D15 and is connected to the chip power supply; the anode of the fifteenth diode D15 is connected to the cathode of the sixteenth diode D16, and the connection point serves as the third end of the second clamping unit 2012.

[0108] In practical applications, the pulse level signals generated by the OUTA and OUTB pins of the second driver chip U40 can be clamped between the chip power supply and ground through the thirteenth diode D13, the fourteenth diode D14, the fifteenth diode D15 and the sixteenth diode D16, thereby playing a protective role.

[0109] It should be noted that, in practice, the first output end of the upper tube power supply unit can also be used as the positive end of the power supply test port, and the second output end of the upper tube power supply unit can also be used as the negative end of the power supply test port to achieve the test of the power supply performance; similarly, in practice, the first output end of the lower tube power supply unit can also be used as the positive end of the power supply test port, and the second output end of the lower tube power supply unit can be used as the negative end of the power supply test port to achieve the test of the power supply performance.

[0110] Based on the above principles, the power supply circuit of the half-bridge drive circuit provided in this embodiment includes: a pulse signal generating unit 101, an upper tube power supply unit 102 and a lower tube power supply unit 103; the pulse signal generating circuit is used to generate a sawtooth signal through self-excited oscillation, and generate a first pulse signal and a second pulse signal according to the sawtooth signal, and the first pulse signal and the second pulse signal are complementary signals; the upper tube power supply unit 102 is used to generate an upper tube high level signal, an upper tube negative level signal and an upper tube reference zero point signal according to the first pulse signal and the second pulse signal; the lower tube power supply unit 103 is used to generate an upper tube high level signal, an upper tube negative level signal and an upper tube reference zero point signal according to the first pulse signal and the second pulse signal The pulse signal generates a high-level signal for the lower tube, a negative-level signal for the lower tube and a reference zero point signal for the lower tube, which can provide power for the power supply chips corresponding to the upper tube and the lower tube in the half-bridge drive circuit. The pulse transformers in the upper tube power supply unit 102 and the lower tube power supply unit 103 in the power supply circuit are independent of each other and do not interfere with each other. There is no need for a switching tube, and there is no need to consider the voltage resistance of the switching tube. This solves the problem that the existing circuit requires the switching tube to have a higher voltage resistance or requires multiple switching tubes to be connected in series, and requires a flyback transformer with a large winding coil, resulting in a large leakage inductance and low efficiency due to reverse recovery, resulting in high circuit cost and difficulty in control.

[0111] It is worth noting that there is also a power supply circuit for a driving circuit, such as Figure 6 As shown, the circuit mainly uses the bootstrap principle to generate a bootstrap power supply. The inventors have found that this circuit is only suitable for low-power and low-voltage occasions. In high-power and high-voltage circuits, the upper tube drive power supply is prone to fluctuations, which affects the upper tube drive. The power supply circuit of the half-bridge drive circuit provided in this application can be applied to high-power and high-voltage application scenarios. Not only are the upper tube power supply unit 102 and the lower tube power supply unit 103 independent of each other, but the pulse transformers in the upper tube power supply unit 102 and the lower tube power supply unit 103 are also independent of each other, which can provide power for the half-bridge drive circuit in high-power and high-voltage occasions.

[0112] Based on the above, another embodiment of the present application also provides a power module, which may include: at least one half-bridge drive circuit, the half-bridge drive circuit is used to drive the corresponding power tube in the power module, and the half-bridge drive circuit supplies power to the corresponding drive chip in itself through the power supply circuit of the half-bridge drive circuit described in any of the above embodiments.

[0113] In practical applications, the number of half-bridge drive circuits in the power module can be determined according to the application environment and can be any positive integer. This application does not make any specific restrictions and all are within the scope of protection of this application.

[0114] It should be noted that a corresponding number of half-bridge driving circuits should be provided according to the number of half-bridge structures in the power module, so as to provide driving power for the driving circuits corresponding to the respective half-bridge structures.

[0115] It should also be noted that, for the relevant description of the power supply circuit of the half-bridge drive circuit, please refer to the corresponding embodiment above, which will not be repeated here; for the relevant description of the half-bridge drive circuit and the power module, please refer to the prior art, which will not be repeated in this application.

[0116] The features described in the various embodiments of this specification may be interchanged or combined. Similar or identical parts between the various embodiments may be referenced to each other. Each embodiment focuses on the differences from other embodiments. In particular, since system or system embodiments are generally similar to method embodiments, their descriptions are relatively simplified. For relevant details, reference may be made to the description of the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network elements. Some or all of these modules may be selected based on actual needs to achieve the objectives of the present embodiments. Persons of ordinary skill in the art will be able to understand and implement these embodiments without inventive effort. Professionals will further appreciate that the units and algorithmic steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented using electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0117] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

[0118] It should also be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

Claims

1. A power supply circuit for a half-bridge drive circuit, characterized in that: include: Pulse signal generating unit, upper tube power supply unit and lower tube power supply unit; The pulse signal generating unit is connected to the upper tube power supply unit and the lower tube power supply unit respectively; The first output terminal of the pulse signal generating unit outputs a first pulse signal, and the second output terminal of the pulse signal generating unit outputs a second pulse signal, wherein the first pulse signal and the second pulse signal are complementary signals; The first receiving end of the upper tube power supply unit receives the first pulse signal, the second receiving end of the upper tube power supply unit receives the second pulse signal, the first output end of the upper tube power supply unit outputs an upper tube high level signal, the second output end of the upper tube power supply unit outputs an upper tube negative level signal, and the third output end of the upper tube power supply unit outputs an upper tube reference zero point signal; The first receiving end of the lower tube power supply unit receives the first pulse signal, the second receiving end of the lower tube power supply unit receives the second pulse signal, the first output end of the lower tube power supply unit outputs a lower tube high level signal, the second output end of the lower tube power supply unit outputs a lower tube negative level signal, and the third output end of the lower tube power supply unit outputs a lower tube reference zero point signal.

2. The power supply circuit of the half-bridge driving circuit according to claim 1, characterized in that: The pulse signal generating unit includes: a first inverter, a second inverter, a third inverter, a fourth inverter, a first diode, a second diode, a first resistor, a second resistor and a first capacitor; The anode of the first diode is grounded, the cathode of the first diode is connected to the anode of the second diode, the input end of the first inverter and one end of the first resistor respectively, and the cathode of the second diode is connected to the chip power supply; The output end of the first inverter is connected to the input end of the second inverter and one end of the second resistor respectively, and the output end of the second inverter is connected to the input end of the third inverter and one end of the first capacitor respectively; The other end of the first resistor is connected to the other end of the second resistor and the other end of the first capacitor respectively; The output end of the third inverter is connected to the input end of the fourth inverter, and the connection point serves as the first output end of the pulse signal generating unit, outputting the first pulse signal; The output end of the fourth inverter serves as the second output end of the pulse signal generating unit to output the second pulse signal.

3. The power supply circuit of the half-bridge driving circuit according to claim 2, characterized in that: The pulse signal generating unit further includes: a second capacitor and a third capacitor; The power supply pin of the second inverter is grounded through the second capacitor, and the power supply pin of the fourth inverter is grounded through the third capacitor.

4. The power supply circuit of the half-bridge driving circuit according to claim 1, characterized in that: The upper tube power supply unit includes: a first driver chip, a first pulse transformer, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a third resistor, a fourth resistor, a fifth resistor, a third diode, a fourth diode, a fifth diode and a first clamping unit; The INA pin of the first driver chip serves as the first input terminal of the upper tube power supply unit to receive the first pulse signal; the INB pin of the first driver chip serves as the second input terminal of the upper tube power supply unit to receive the second pulse signal; the GND pin of the first driver chip is respectively connected to one end of the fourth capacitor and the first end of the first clamping unit and is grounded; the VCC pin of the first driver chip is connected to the other end of the fourth capacitor and is connected to the chip power supply; the OUTA pin of the first driver chip is respectively connected to the second end of the first clamping unit and one end of the third resistor; the OUTB pin of the first driver chip is respectively connected to the third end of the first clamping unit, one end of the fifth capacitor, and one end of the sixth capacitor; The other end of the third resistor is connected to the opposite-name terminal of the primary side of the first pulse transformer; the other end of the fifth capacitor is connected to the other end of the sixth capacitor and the same-name terminal of the primary side of the first pulse transformer respectively; The secondary side opposite-name terminals of the first pulse transformer are respectively connected to one end of the seventh capacitor and one end of the eighth capacitor; the other end of the seventh capacitor is respectively connected to the other end of the eighth capacitor, the anode of the third diode, and the cathode of the fourth diode; The secondary side like-named terminals of the first pulse transformer are respectively connected to the anode of the fourth diode and one end of the ninth capacitor, one end of the fourth resistor, the anode of the fifth diode and one end of the tenth capacitor, and the connection points serve as the second output terminal of the upper tube power supply unit, outputting the negative level signal of the upper tube; The cathode of the third diode is connected to the other end of the ninth capacitor, the other end of the fourth resistor, and one end of the fifth resistor, respectively, and the connection points serve as the first output end of the upper tube power supply unit to output the high-level signal of the upper tube; The other end of the fifth resistor is connected to the cathode of the fifth diode and the other end of the tenth capacitor respectively, and the connection point serves as the third output end of the upper tube power supply unit to output the upper tube reference zero point signal.

5. The power supply circuit of the half-bridge driving circuit according to claim 4, characterized in that: The first clamping unit includes: a sixth diode, a seventh diode, an eighth diode and a ninth diode; The anode of the sixth diode is connected to the anode of the ninth diode, and the connection point serves as the first end of the first clamping unit; The cathode of the sixth diode is connected to the anode of the seventh diode, and the connection point serves as the second end of the first clamping unit; The cathode of the seventh diode is connected to the cathode of the eighth diode and connected to the chip power supply; the anode of the eighth diode is connected to the cathode of the ninth diode, and the connection point serves as the third end of the first clamping unit.

6. The power supply circuit of the half-bridge driving circuit according to claim 4, characterized in that: The third diode is a rectifier diode, the fourth diode is a freewheeling diode, and the fifth diode is a voltage regulator diode.

7. The power supply circuit of the half-bridge driving circuit according to claim 1, characterized in that: The lower tube power supply unit includes: a second driving chip, a second pulse transformer, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, a sixth resistor, a seventh resistor, an eighth resistor, a tenth diode, an eleventh diode, a twelfth diode, and a second clamping unit; The INA pin of the second driver chip serves as the first input terminal of the lower tube power supply unit to receive the first pulse signal; the INB pin of the second driver chip serves as the second input terminal of the lower tube power supply unit to receive the second pulse signal; the GND pin of the second driver chip is respectively connected to one end of the eleventh capacitor and the first end of the second clamping unit and is grounded; the VCC pin of the second driver chip is connected to the other end of the eleventh capacitor and is connected to the chip power supply; the OUTA pin of the second driver chip is respectively connected to the second end of the second clamping unit and one end of the sixth resistor; the OUTB pin of the second driver chip is respectively connected to the third end of the second clamping unit, one end of the twelfth capacitor, and one end of the thirteenth capacitor; The other end of the sixth resistor is connected to the opposite-name terminal of the primary side of the second pulse transformer; the other end of the twelfth capacitor is connected to the other end of the thirteenth capacitor and the same-name terminal of the primary side of the second pulse transformer respectively; The secondary side opposite-name terminals of the second pulse transformer are respectively connected to one end of the fourteenth capacitor and one end of the fifteenth capacitor; the other end of the fourteenth capacitor is respectively connected to the other end of the fifteenth capacitor, the anode of the tenth diode, and the cathode of the eleventh diode; The secondary side like-named terminals of the second pulse transformer are respectively connected to the anode of the eleventh diode, one end of the sixteenth capacitor, one end of the seventh resistor, the anode of the twelfth diode, and one end of the seventeenth capacitor, and the connection points serve as the second output terminal of the lower tube power supply unit, outputting the negative level signal of the lower tube; The cathode of the tenth diode is connected to the other end of the sixteenth capacitor, the other end of the seventh resistor, and one end of the eighth resistor, respectively, and the connection points serve as the first output end of the lower tube power supply unit to output the high-level signal of the lower tube; The other end of the eighth resistor is connected to the cathode of the twelfth diode and the other end of the seventeenth capacitor respectively, and the connection point serves as the third output end of the lower tube power supply unit to output the lower tube reference zero point signal.

8. The power supply circuit of the half-bridge driving circuit according to claim 7, characterized in that: The second clamping unit includes: a thirteenth diode, a fourteenth diode, a fifteenth diode and a sixteenth diode; The anode of the thirteenth diode is connected to the anode of the sixteenth diode, and the connection point serves as the first end of the second clamping unit; The cathode of the thirteenth diode is connected to the anode of the fourteenth diode, and the connection point serves as the second end of the second clamping unit; The cathode of the fourteenth diode is connected to the cathode of the fifteenth diode and is connected to the chip power supply; the anode of the fifteenth diode is connected to the cathode of the sixteenth diode, and the connection point serves as the third end of the second clamping unit.

9. The power supply circuit of the half-bridge driving circuit according to claim 7, characterized in that: The tenth diode is a rectifier diode, the eleventh diode is a freewheeling diode, and the twelfth diode is a voltage regulator diode.

10. A power module, characterized in that: include: At least one half-bridge drive circuit, the half-bridge drive circuit is used to drive the corresponding power tube in the power module, and the half-bridge drive circuit supplies power to the corresponding drive chip in itself through the power supply circuit of any half-bridge drive circuit as claimed in claims 1-9.

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