Highly integrated gallium nitride power supply

Abstract

The utility model discloses a kind of high-integration degree gallium nitride power supply, including ac-dc conversion circuit, transformer and power controller.Input power is converted into high-voltage direct current power by ac-dc conversion circuit;Power controller is equipped with PWM pulse signal generation control module, drive control module and gallium nitride switch tube, PWM pulse signal generation control module is connected with the gate of gallium nitride switch tube by drive control module, to output pulse width modulation signal to gallium nitride switch tube for switching control, and the current of transformer primary coil is pulse width modulated by gallium nitride switch tube, output rectification filter circuit is used to the voltage stabilizing filtering of the voltage conversion signal output by transformer secondary coil, to output direct current power.By using gallium nitride switch tube as voltage conversion switch tube, efficiency can be improved, and gallium nitride switch tube is integrated in power controller, so that power supply circuit volume can be smaller, peripheral circuit is simpler, can satisfy small size, high-power application demand.

Description

Technical Field

[0001] This utility model relates to power supplies, and more particularly to a highly integrated gallium nitride power supply. Background Technology

[0002] In power supply circuits, the switching transistor is a core component, used to control the conduction or cutoff of current in a transformer or inductor. Current power supply technology primarily uses MOSFETs for this purpose. Existing MOSFETs (Metal Oxide Semiconductor Field Effect Transistors) are insulated-gate type field effect transistors. Their manufacturing process involves creating two highly doped N+ regions on a lightly doped P-type silicon substrate using semiconductor lithography and diffusion processes. Two aluminum electrodes are then used as the drain (D) and source (S). A thin silicon dioxide (SiO2) insulating layer is then deposited on the P-type semiconductor surface between the drain and source, and an aluminum electrode is mounted on this insulating layer as the gate (G). This forms an N-channel (NPN) enhancement-mode MOSFET. However, existing MOSFETs generate significant heat, have low power conversion efficiency, and result in a large overall power supply size.

[0003] To improve power conversion efficiency and reduce power supply size, existing technologies use gallium nitride (GaN) switches as the core device for power supply switching control. However, discrete GaN switches are typically used, resulting in relatively low integration density, complex overall circuitry, and relatively large size. Summary of the Invention

[0004] The main objective of this invention is to provide a highly integrated gallium nitride power supply, addressing the shortcomings of the prior art.

[0005] To achieve the above objectives, the present invention provides a highly integrated gallium nitride power supply, comprising:

[0006] An AC / DC conversion circuit is connected to an input power supply to convert the input power supply into a high-voltage DC power supply.

[0007] A transformer, one end of the primary coil of which is connected to the output terminal of an AC / DC conversion circuit;

[0008] An output rectifier and filter circuit, wherein the input terminal of the output rectifier and filter circuit is connected to the secondary coil of the transformer;

[0009] The power controller includes a PWM pulse signal generation and control module, a drive control module, and a gallium nitride (GaN) switching transistor. The drain of the GaN switching transistor is connected to the other end of the primary coil of the transformer, and the source of the GaN switching transistor is connected to the drive control module. The PWM pulse signal generation and control module is connected to the gate of the GaN switching transistor through the drive control module to output a pulse width modulation signal to control the switching of the GaN switching transistor and to pulse-width modulate the current of the primary coil of the transformer through the GaN switching transistor. The output rectifier and filter circuit is used to regulate and filter the transformer signal output from the secondary coil of the transformer to output DC power.

[0010] Furthermore, according to one embodiment of the present invention, the highly integrated gallium nitride power supply further includes an auxiliary power supply circuit, which is connected to the power controller to regulate the output power of the auxiliary coil of the transformer and then supply power to the power controller.

[0011] Furthermore, according to one embodiment of the present invention, the auxiliary power supply circuit includes:

[0012] A first diode D2, the anode of the first diode D2 is connected to one end of the auxiliary coil of the transformer through a first resistor R1, and the other end of the auxiliary coil of the transformer is connected to a reference ground;

[0013] The first capacitor EC3 has one end connected to the cathode of the first diode D2, and the other end connected to the reference ground.

[0014] Voltage converter U2, the cathode of the first diode D2 is connected to the input terminal of voltage converter U2, and the output terminal of voltage converter U2 is connected to the power supply terminal of the power controller;

[0015] The second capacitor C5 has one end connected to the output terminal of the voltage converter U2, and the other end connected to the reference ground.

[0016] Furthermore, according to one embodiment of the present invention, the highly integrated gallium nitride power supply further includes a primary-side voltage detection circuit, the primary-side voltage detection circuit comprising:

[0017] The second resistor RP1, one end of which is connected to the auxiliary coil of the transformer;

[0018] The third resistor RP2 has one end connected to the other end of the second resistor RP1, and the other end of the third resistor RP2 is connected to the reference ground. The common terminal of the second resistor RP1 and the third resistor RP2 is connected to the voltage feedback terminal of the power controller.

[0019] Furthermore, according to one embodiment of the present invention, the highly integrated gallium nitride power supply further includes: a primary-side current detection circuit, the primary-side current detection circuit including a fourth resistor R8, one end of the fourth resistor R8 being connected to the current detection terminal of the power controller to obtain the current of the primary winding of the transformer, and the drive control module is also used to perform overcurrent protection based on the current.

[0020] Furthermore, according to one embodiment of the present invention, the output rectifier filter circuit includes:

[0021] The second diode D3 has its anode connected to one end of the secondary coil of the transformer, and the other end of the secondary coil of the transformer is connected to a reference ground. The diode is used to rectify and output the transformer power supply from the secondary coil of the transformer.

[0022] The third capacitor EC5 has one end connected to the cathode of the second diode D3 and the other end connected to the reference ground. The third capacitor EC5 is used to regulate the power output of the rectified power supply of the second diode D3.

[0023] The fifth resistor R12 has one end connected to the cathode of the second diode D3 and the other end connected to reference ground; the first common-mode inductor LF2 has one end connected to the cathode of the second diode D3 and the other end connected to reference ground, and the output side of the first common-mode inductor LF2 is used to output the DC power supply.

[0024] Furthermore, according to one embodiment of the present invention, the output rectifier filter circuit further includes:

[0025] The fourth capacitor C7, one end of which is connected to one end of the secondary coil of the transformer;

[0026] The sixth resistor R11 has one end connected to the other end of the fourth capacitor C7 and the other end connected to the cathode of the second diode D3. The fourth capacitor C7 and the sixth resistor R11 are used to absorb the high-voltage pulse signal of the transformer secondary coil.

[0027] Furthermore, according to one embodiment of the present invention, the highly integrated gallium nitride power supply further includes a primary peak-sniffing circuit, which is connected to the secondary coil of the transformer to absorb the high-voltage pulse signal of the primary coil of the transformer. The primary peak-sniffing circuit includes:

[0028] The anode of the third diode D1 is connected to the other end of the primary coil of the transformer;

[0029] The seventh resistor R3, one end of which is connected to the cathode of the third diode D1,

[0030] The eighth resistor R5, one end of which is connected to the other end of the seventh resistor R3, and the other end of which is connected to the primary coil of the transformer.

[0031] The fifth capacitor C2 has one end connected to the other end of the seventh resistor R3, and the other end of the fifth capacitor C2 is connected to one end of the primary coil of the transformer.

[0032] Furthermore, according to one embodiment of the present invention, the AC / DC conversion circuit includes:

[0033] Rectifier bridge BD1, the input side of which is connected to the input AC power to rectify and output the input AC power;

[0034] The first filter capacitor EC1 is connected to the two output terminals of the rectifier bridge BD1 respectively, so as to rectify and filter the pulsating DC output into a stable DC.

[0035] The second common mode inductor LF1 is connected to the two output terminals of the rectifier bridge BD1 at its input side.

[0036] The second filter capacitor CE2 is connected to the two ends of the output side of the second common mode inductor LF1.

[0037] Furthermore, according to one embodiment of the present invention, the AC / DC conversion circuit further includes:

[0038] Fuse F1, one end of the input side of the rectifier bridge BD1 is connected to one end of the input AC power through fuse F1;

[0039] Thermistor NTC1, the other end of the input side of the rectifier bridge BD1 is connected to the other end of the input AC power through the thermistor NTC1;

[0040] A varistor MOV1, the two ends of which are respectively connected to the two ends of the input side of the rectifier bridge BD1;

[0041] Safety capacitor CX1, the two ends of which are respectively connected to the two ends of the input side of rectifier bridge BD1.

[0042] This utility model provides a highly integrated gallium nitride (GaN) power supply. It connects to an input power source via an AC / DC converter circuit to convert the input power into a high-voltage DC power supply. One end of the primary coil of a transformer is connected to the output terminal of the AC / DC converter circuit. The input terminal of the output rectifier and filter circuit is connected to the secondary coil of the transformer. The power controller includes a PWM pulse signal generation and control module, a drive control module, and a GaN switch. The drain of the GaN switch is connected to the other end of the primary coil of the transformer, and the source of the GaN switch is connected to the drive control module. The PWM pulse signal generation and control module is connected to the gate of the GaN switch through the drive control module to output a pulse width modulation signal to control the switching of the GaN switch and to pulse-width modulate the current of the primary coil of the transformer. The output rectifier and filter circuit is used to regulate and filter the transformer signal output from the secondary coil of the transformer to output DC power. By using a GaN switch as the transformer switch, efficiency can be improved. Furthermore, the integration of gallium nitride (GaN) switches within the power controller allows for a smaller power circuit size and simpler peripheral circuitry, meeting the application requirements of small size and high power. Attached Figure Description

[0043] Figure 1 This is a circuit schematic diagram of a highly integrated gallium nitride power supply provided in an embodiment of this utility model;

[0044] Figure 2 This is a structural block diagram of the power controller provided in an embodiment of the present utility model.

[0045] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0046] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0047] See Figure 1 and Figure 2This utility model provides a highly integrated gallium nitride power supply, including: an AC / DC conversion circuit, a transformer, an output rectifier and filter circuit, and a power controller. The AC / DC conversion circuit is connected to the input power supply to convert the input power supply into a high-voltage DC power supply. The AC / DC conversion module can convert AC mains power into a first DC power, which is a high-voltage DC power.

[0048] One end of the primary coil of the transformer is connected to the output terminal of the AC-DC conversion circuit; through the transformer, the pulse width-adjusted first DC power can be transformed and output, thereby converting the high-voltage DC power into low-voltage DC power output to supply power to low-voltage electrical equipment.

[0049] The input terminal of the output rectifier and filter circuit is connected to the secondary coil of the transformer; the output rectifier and filter circuit is connected to the secondary coil of the transformer to rectify and filter the pulse width modulation pulsating DC power output by the transformer into a stable low-voltage DC power, and then output it.

[0050] The power controller includes a PWM pulse signal generation and control module, a drive control module, and a gallium nitride (GaN) switch. The drain of the GaN switch is connected to the other end of the primary coil of the transformer, and the source of the GaN switch is connected to the drive control module. The PWM pulse signal generation and control module is connected to the gate of the GaN switch through the drive control module to output a pulse width modulation signal to control the switching of the GaN switch and to pulse-width modulate the current of the primary coil of the transformer through the GaN switch. The output rectifier and filter circuit is used to regulate and filter the transformer signal output from the secondary coil of the transformer to output DC power.

[0051] Specifically, during the voltage transformation process via the transformer, the PWM pulse signal generation and control module outputs an adjustable pulse signal to the drive control module, which then drives the gallium nitride (GaN) switching transistor. This controls the on / off state of the GaN switching transistor, which pulse-modulates the high-voltage DC current on the primary coil of the transformer. The pulse-modulated high-voltage DC current is then output from the secondary coil of the transformer via mutual inductance transformation. The output rectifier and filter circuit regulates and filters the voltage signal output from the secondary coil to produce a DC power supply. In this embodiment, by using a GaN switching transistor as the primary coil switching transistor, high power can be provided for a longer period because GaN components generate less heat, can be placed closer, and are the same size as older chargers, yet can provide high current for extended periods without overheating. Compared to silicon chargers, GaN chargers can determine the required current value more quickly and deliver high power for longer periods. In summary, this intelligent enhanced GaN charger offers advantages such as high efficiency, flexibility, and durability. Furthermore, since the gallium nitride switching transistor is integrated into the power controller, the power supply circuit can be smaller and the peripheral circuitry can be simpler, which can meet the application requirements of small size and high power.

[0052] See Figure 1 The highly integrated gallium nitride power supply also includes an auxiliary power supply circuit connected to the power controller. This auxiliary power supply circuit regulates the output power from the auxiliary coil of the transformer before supplying power to the power controller. This reduces the need for an auxiliary power supply, further reducing the overall circuit cost. Figure 1 As shown, the auxiliary power supply circuit includes: a first diode D2, a first capacitor EC3, a voltage converter U2, and a second capacitor C5. The anode of the first diode D2 is connected to one end of the auxiliary coil of the transformer through a first resistor R1, and the other end of the auxiliary coil of the transformer is connected to a reference ground. One end of the first capacitor EC3 is connected to the cathode of the first diode D2, and the other end of the first capacitor EC3 is connected to a reference ground. The cathode of the first diode D2 is connected to the input terminal of the voltage converter U2, and the output terminal of the voltage converter U2 is connected to the power supply terminal of the power controller. One end of the second capacitor C5 is connected to the output terminal of the voltage converter U2, and the other end of the second capacitor C5 is connected to a reference ground.

[0053] The auxiliary power supply circuit operates as follows: the auxiliary coil T1B of the transformer transforms the primary DC power output of the transformer, and the first diode D2 rectifies the output power before outputting it to the first capacitor EC3. The first capacitor EC3 filters the output into a stable DC power, which then powers the power controller U1 via resistor R17. In this embodiment, when the stable DC power output from the first capacitor EC3 cannot meet the power supply requirements of the power controller U1, the voltage converter U2 can further convert the voltage before supplying power to the power controller U1. The second capacitor C5 further filters out interference signals, ensuring the stability of the power supply to the power controller U1.

[0054] See Figure 1 The highly integrated gallium nitride power supply also includes a primary-side voltage detection circuit, which comprises a second resistor RP1 and a third resistor RP2. One end of the second resistor RP1 is connected to one end of the auxiliary coil of the transformer; one end of the third resistor RP2 is connected to the other end of the second resistor RP1, and the other end of the third resistor RP2 is connected to a reference ground. The common terminal of the second resistor RP1 and the third resistor RP2 is connected to the voltage feedback terminal of the power controller. Due to the mutual inductance of the transformer, the voltage of the secondary coil and the auxiliary coil form a certain curve relationship. The primary-side voltage detection circuit can reflect the voltage value at the output terminal, and the power controller U1 can output a PWM pulse width modulation signal to regulate and control the output voltage, ensuring the stability of the output voltage. The second resistor RP1 and the third resistor RP2 form a voltage divider circuit, which divides the output voltage of the auxiliary coil and outputs it to the voltage feedback terminal of the power controller U1. The PWM pulse signal generation and control module in the power controller U1 can output a PWM pulse width modulation signal according to the feedback voltage and output it to the drive control module. The drive control module drives the gallium nitride switch to turn on or off. This achieves PWM pulse width modulation, thereby regulating and controlling the output power supply to maintain its stability.

[0055] See Figure 1 The highly integrated gallium nitride power supply further includes a primary-side current detection circuit, which includes a fourth resistor R8. One end of the fourth resistor R8 is connected to the current detection terminal of the power controller to obtain the current of the primary winding of the transformer. The drive control module is also used to perform overcurrent protection based on the current. Figure 1As shown, the primary current detection circuit includes a fourth resistor R8, and may also include multiple parallel resistors R8, R9, and R10. The current in the primary coil of the transformer can be obtained through the fourth resistor R8 or the parallel resistors R8, R9, and R10, and the obtained current is fed back to the current detection terminal of the power controller U1. When the drive control module within the power controller U1 determines that the current exceeds a set value, it can control the gallium nitride switch to turn off, thereby performing overcurrent protection control.

[0056] See Figure 1 The output rectifier and filter circuit includes: a second diode D3, a third capacitor EC5, a fifth resistor R12, and a first common-mode inductor LF2. The anode of the second diode D3 is connected to one end of the secondary winding of the transformer, and the other end of the secondary winding of the transformer is connected to a reference ground. The diode is used to rectify and output the transformer power supply from the secondary winding of the transformer. One end of the third capacitor EC5 is connected to the cathode of the second diode D3, and the other end of the third capacitor EC5 is connected to a reference ground. The third capacitor EC5 is used to regulate the output power supply rectified by the second diode D3. One end of the fifth resistor R12 is connected to the cathode of the second diode D3, and the other end of the fifth resistor R12 is connected to a reference ground. One end of the input side of the first common-mode inductor LF2 is connected to the cathode of the second diode D3, and the other end of the input side of the first common-mode inductor LF2 is connected to a reference ground. The output side of the first common-mode inductor LF2 is used to output the DC power supply.

[0057] Specifically, the output rectifier and filter circuit operates as follows: the second diode D3 rectifies the modulated power output from the secondary coil of the transformer into pulsating DC, which is then output to the third capacitor EC5. The third capacitor EC5 filters the rectified pulsating DC into stable DC, which can then be output through the first common-mode inductor LF2 to power external devices. The fifth resistor R12 releases the charge from the third capacitor EC5, preventing it from continuing to discharge after power is cut off, thus ensuring the safety of the power charger.

[0058] See Figure 1The output rectifier and filter circuit further includes a fourth capacitor C7 and a sixth resistor R11. One end of the fourth capacitor C7 is connected to one end of the secondary coil of the transformer; one end of the sixth resistor R11 is connected to the other end of the fourth capacitor C7, and the other end of the sixth resistor R11 is connected to the cathode of the second diode D3. The fourth capacitor C7 and the sixth resistor R11 are used to absorb the high-voltage pulse signal of the secondary coil of the transformer. When the gallium nitride switch is turned off, the primary and secondary coils of the transformer will generate pulse signals. To avoid damage to the devices by the pulse signals, the fourth capacitor C7 and the sixth resistor R11 form an absorption circuit, which can absorb the pulse signals and ensure the reliability of the circuit.

[0059] See Figure 1 The highly integrated gallium nitride power supply also includes a primary peak-sucking circuit. This primary peak-sucking circuit is connected to the secondary coil of the transformer to absorb high-voltage pulse signals from the primary coil of the transformer. The primary peak-sucking circuit includes: a third diode D1, a seventh resistor R3, an eighth resistor R5, and a fifth capacitor C2. The anode of the third diode D1 is connected to the other end of the primary coil of the transformer. One end of the seventh resistor R3 is connected to the cathode of the third diode D1. One end of the eighth resistor R5 is connected to the other end of the seventh resistor R3, and the other end of the eighth resistor R5 is connected to one end of the primary coil of the transformer. One end of the fifth capacitor C2 is connected to the other end of the seventh resistor R3, and the other end of the fifth capacitor C2 is connected to one end of the primary coil of the transformer. When the gallium nitride switch is turned off, the primary coil of the transformer will generate a pulse signal. To prevent the gallium nitride switch from being damaged by the pulse signal, an absorbing circuit is formed by the third diode D1, the seventh resistor R3, the eighth resistor R5 and the fifth capacitor C2, which can absorb the pulse signal and ensure the reliability of the circuit.

[0060] See Figure 1 The AC / DC conversion circuit includes: a rectifier bridge BD1, a first filter capacitor EC1, a second common-mode inductor LF1, and a second filter capacitor CE2. The input side of the rectifier bridge BD1 is connected to the input AC power to rectify and output the input AC power. The two ends of the first filter capacitor EC1 are respectively connected to the two output ends of the rectifier bridge BD1 to rectify and filter the pulsating DC power output into a stable DC power. The two ends of the input side of the second common-mode inductor LF1 are respectively connected to the two output ends of the rectifier bridge BD1. The two ends of the second filter capacitor CE2 are respectively connected to the two ends of the output side of the second common-mode inductor LF1.

[0061] Specifically, the introduced AC power is converted into half-wave DC power by rectifier DB1 and output. The first filter capacitor EC1 is a voltage stabilizing filter capacitor, which can stabilize and filter the half-wave DC power output by rectifier BD1 into a stable DC power and output it to the second common-mode inductor LF1. The second common-mode inductor LF1 and the second filter capacitor CE2 can further filter the DC power and output a stable high-voltage first DC power to the primary coil of the transformer, which then performs voltage transformation and output.

[0062] See Figure 1 The AC / DC conversion circuit further includes: a fuse F1, a thermistor NTC1, a varistor MOV1, and a safety capacitor CX1. One end of the input side of the rectifier bridge BD1 is connected to one end of the input AC power through the fuse F1; the other end of the input side of the rectifier bridge BD1 is connected to the other end of the input AC power through the thermistor NTC1; the two ends of the varistor MOV1 are respectively connected to the two ends of the input side of the rectifier bridge BD1; and the two ends of the safety capacitor CX1 are respectively connected to the two ends of the input side of the rectifier bridge BD1.

[0063] Specifically, overcurrent protection is provided by connecting fuse F1 in series with the input AC power circuit, and over-temperature protection is provided by connecting the thermistor NTC1 in series with the input AC power circuit. Overvoltage protection is provided by connecting the varistor MOV1 in parallel across the input AC power circuit. The safety capacitor CX1 absorbs pulse signals across the input AC power circuit, ensuring the stability of the downstream circuitry.

[0064] The above description is only a preferred embodiment of the present utility model and does not limit its patent scope. Any equivalent structural or procedural transformations made based on the contents of the present utility model specification and drawings, whether directly or indirectly applied to other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A highly integrated gallium nitride power supply, characterized in that, include: An AC / DC conversion circuit is connected to an input power supply to convert the input power supply into a high-voltage DC power supply. A transformer, one end of the primary coil of which is connected to the output terminal of an AC / DC conversion circuit; An output rectifier and filter circuit, wherein the input terminal of the output rectifier and filter circuit is connected to the secondary coil of the transformer; The power controller includes a PWM pulse signal generation and control module, a drive control module, and a gallium nitride (GaN) switching transistor. The drain of the GaN switching transistor is connected to the other end of the primary coil of the transformer, and the source of the GaN switching transistor is connected to the drive control module. The PWM pulse signal generation and control module is connected to the gate of the GaN switching transistor through the drive control module to output a pulse width modulation signal to control the switching of the GaN switching transistor and to pulse-width modulate the current of the primary coil of the transformer through the GaN switching transistor. The output rectifier and filter circuit is used to regulate and filter the transformer signal output from the secondary coil of the transformer to output DC power.

2. The highly integrated gallium nitride power supply according to claim 1, characterized in that, It also includes an auxiliary power supply circuit, which is connected to the power controller to regulate the output power of the auxiliary coil of the transformer and then supply power to the power controller.

3. The highly integrated gallium nitride power supply according to claim 2, characterized in that, The auxiliary power supply circuit includes: A first diode (D2) is connected to one end of the auxiliary coil of the transformer via a first resistor (R1), and the other end of the auxiliary coil of the transformer is connected to a reference ground. The first capacitor (EC3) has one end connected to the cathode of the first diode (D2), and the other end connected to the reference ground. A voltage converter (U2) is provided, wherein the cathode of the first diode (D2) is connected to the input terminal of the voltage converter (U2), and the output terminal of the voltage converter (U2) is connected to the power supply terminal of the power controller. The second capacitor (C5) has one end connected to the output terminal of the voltage converter (U2) and the other end connected to the reference ground.

4. The highly integrated gallium nitride power supply according to claim 3, characterized in that, It also includes a primary-side voltage detection circuit, which comprises: The second resistor (RP1) has one end connected to one end of the auxiliary coil of the transformer; The third resistor (RP2) has one end connected to the other end of the second resistor (RP1), and the other end of the third resistor (RP2) is connected to the reference ground. The common terminal of the second resistor (RP1) and the third resistor (RP2) is connected to the voltage feedback terminal of the power controller.

5. The highly integrated gallium nitride power supply according to claim 3, characterized in that, Also includes: The primary current detection circuit includes a fourth resistor (R8), one end of which is connected to the current detection terminal of the power controller to obtain the current of the primary coil of the transformer. The drive control module is also used to perform overcurrent protection based on the current.

6. The highly integrated gallium nitride power supply according to claim 1, characterized in that, The output rectifier and filter circuit includes: The second diode (D3) has its anode connected to one end of the secondary coil of the transformer, and the other end of the secondary coil of the transformer is connected to a reference ground. The diode is used to rectify and output the transformer power supply from the secondary coil of the transformer. The third capacitor (EC5) has one end connected to the cathode of the second diode (D3) and the other end connected to the reference ground. The third capacitor (EC5) is used to regulate the output voltage of the power supply rectified by the second diode (D3). The fifth resistor (R12) has one end connected to the cathode of the second diode (D3) and the other end connected to reference ground; the first common-mode inductor (LF2) has one end connected to the cathode of the second diode (D3) and the other end connected to reference ground, and the output side of the first common-mode inductor (LF2) is used to output the DC power supply.

7. The highly integrated gallium nitride power supply according to claim 6, characterized in that, The output rectifier and filter circuit further includes: A fourth capacitor (C7), one end of which is connected to one end of the secondary coil of the transformer; The sixth resistor (R11) has one end connected to the other end of the fourth capacitor (C7) and the other end connected to the cathode of the second diode (D3). The fourth capacitor (C7) and the sixth resistor (R11) are used to absorb the high-voltage pulse signal of the transformer secondary coil.

8. The highly integrated gallium nitride power supply according to claim 1, characterized in that, It also includes a primary spike absorption circuit, which is connected to the secondary coil of the transformer to absorb high-voltage pulse signals from the primary coil of the transformer. The primary spike absorption circuit includes: The third diode (D1) has its anode connected to the other end of the primary coil of the transformer; The seventh resistor (R3) has one end connected to the cathode of the third diode (D1). The eighth resistor (R5) has one end connected to the other end of the seventh resistor (R3), and the other end of the eighth resistor (R5) is connected to one end of the primary coil of the transformer. The fifth capacitor (C2) has one end connected to the other end of the seventh resistor (R3), and the other end of the fifth capacitor (C2) is connected to one end of the primary coil of the transformer.

9. The highly integrated gallium nitride power supply according to any one of claims 1 to 8, characterized in that, The AC / DC conversion circuit includes: A rectifier bridge (BD1) is connected to the input AC power on its input side to rectify and output the input AC power. The first filter capacitor (EC1) is connected to the two output terminals of the rectifier bridge (BD1) respectively, so as to rectify and filter the pulsating DC output into a stable DC. The second common mode inductor (LF1) has its two ends on the input side connected to the two output terminals of the rectifier bridge (BD1), respectively. The second filter capacitor (CE2) is connected to the two ends of the output side of the second common mode inductor (LF1).

10. The highly integrated gallium nitride power supply according to claim 9, characterized in that, The AC / DC conversion circuit also includes: A fuse (F1) is used to connect one end of the input side of the rectifier bridge (BD1) to one end of the input AC power supply. Thermistor (NTC1) is used to connect the other end of the input side of the rectifier bridge (BD1) to the other end of the input AC power supply. A varistor (MOV1) is connected at both ends to the input side of the rectifier bridge (BD1). A safety capacitor (CX1) is connected at both ends to the input side of the rectifier bridge (BD1).

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