High-stability power supply module

Abstract

The utility model discloses a high-stability power supply module, which relates to the technical field of power supply modules and comprises a rectifier module and a half-bridge conversion module which are adaptively connected and are both connected with an MCU (Microprogrammed Control Unit). The rectifier module is used for converting alternating current input voltage into direct current bus voltage and outputting the direct current bus voltage to the half-bridge conversion module, and the half-bridge conversion module is used for converting the direct current bus voltage into required direct current output voltage and outputting the direct current output voltage; the rectification module comprises a three-phase rectification circuit, a boost circuit and a boost driving circuit which are adaptively connected, and based on the AC input voltage, the MCU controls the working state of the three-phase rectification circuit and controls the working state of the boost circuit through the boost driving circuit, so that the DC bus voltage is kept stable. The power supply module satisfies basic functions such as voltage conversion and the like, has greater bearing capacity for power grid voltage fluctuation, and has relatively high stability.

Description

Technical Field

[0001] This utility model relates to the field of power module technology, and in particular to a high-stability power module. Background Technology

[0002] Three-phase alternating current (AC) offers higher transmission efficiency and reliability compared to two-phase AC, and is widely used in industrial applications. However, because the direction of AC current constantly changes, and electromagnetic interference is generated during power transmission, affecting the operation of terminal equipment, many electronic devices require stable direct current (DC) to function properly.

[0003] Power modules can convert AC to DC to meet the needs of different electrical devices and can be designed with different output voltage levels to adapt to the specific DC voltage requirements of different devices. Compared with the traditional method of using transformers for step-down rectification, using power modules simplifies circuit design, significantly reduces overall size and weight, and provides safety protection such as overvoltage and overcurrent protection.

[0004] In everyday applications, load or temperature changes directly affect the grid voltage output from generators or substations, leading to instability in the actual voltage delivered to terminal equipment. Therefore, the operating voltage of power modules is designed to be within a range. Taking 115V three-phase voltage as an example, the operating voltage of such power modules is generally between 100 and 140V. However, in industrial systems, the starting and operation of high-power loads, such as high-power motors and large equipment like steel furnaces, are non-linear. This instability causes drastic fluctuations in the voltage of the power supply line, easily exceeding the normal input voltage range of the power module, resulting in frequent power outages and malfunction.

[0005] Currently, common solutions to this problem include adding capacitors, reactors, or voltage regulators to the power supply system. However, this requires the introduction of additional external circuitry and adjustments to device parameters based on different application scenarios, making it inconvenient for practical use. Another approach is to select power devices with higher voltage ratings and larger operating currents during the design of the power module. However, this increases costs and makes it difficult to find suitable devices. Utility Model Content

[0006] In response to the aforementioned problems and technical requirements, the applicant has proposed a highly stable power module.

[0007] The technical solution of this utility model is as follows:

[0008] A high-stability power module includes a rectifier module and a half-bridge converter module that are adapted and connected, both of which are connected to an MCU.

[0009] The rectifier module is used to convert the AC input voltage into a DC bus voltage and output it to the half-bridge conversion module. The half-bridge conversion module is used to convert the DC bus voltage into the required DC output voltage.

[0010] The rectifier module includes a three-phase rectifier circuit, a boost circuit, and a boost drive circuit that are adapted and connected. Based on the AC input voltage, the MCU controls the operating state of the three-phase rectifier circuit and controls the operating state of the boost circuit through the boost drive circuit to keep the DC bus voltage stable.

[0011] A further technical solution is that the three-phase rectifier circuit includes an A-phase bridge arm, a B-phase bridge arm, and a C-phase bridge arm, wherein...

[0012] The A-phase bridge arm includes an NMOS transistor Q1, a diode D1, an NMOS transistor Q2, and a diode D2. The drain of the NMOS transistor Q1 is connected to the cathode of the diode D1. The anode of the diode D1 is connected to the source of the NMOS transistor Q2 and connected to the A-phase AC bus. The cathode of the diode D2 is connected to the drain of the NMOS transistor Q2.

[0013] The B-phase bridge arm includes NMOS transistor Q3, diode D3, NMOS transistor Q4, and diode D4. The source of NMOS transistor Q3 is connected to the source of NMOS transistor Q1, the drain of NMOS transistor Q3 is connected to the cathode of diode D3, the anode of diode D3 is connected to the source of NMOS transistor Q4 and connected to the B-phase AC bus, the cathode of diode D4 is connected to the drain of NMOS transistor Q4, and the anode of diode D4 is connected to the anode of diode D2.

[0014] The C-phase bridge arm includes NMOS transistor Q5, diode D5, NMOS transistor Q6, and diode D6. The source of NMOS transistor Q5 is connected to the source of NMOS transistor Q3, the drain of NMOS transistor Q5 is connected to the cathode of diode D5, the anode of diode D5 is connected to the source of NMOS transistor Q6 and connected to the C-phase AC bus, the cathode of diode D6 is connected to the drain of NMOS transistor Q6, and the anode of diode D6 is connected to the anode of diode D4.

[0015] A further technical solution is that the three-phase rectifier circuit also includes diode D7, inductor L1, inductor L2, and capacitor C1, wherein,

[0016] The cathode of diode D7 is connected to one end of inductor L1 and the source of NMOS transistor Q5. The anode of diode D7 is connected to one end of inductor L2 and the anode of diode D6. One end of capacitor C1 is connected to the other end of inductor L1, and the other end of capacitor C1 is connected to the other end of inductor L2.

[0017] A further technical solution is that the boost circuit includes an NMOS transistor Q7, a diode D8, a capacitor C2, and an inductor L3, wherein...

[0018] One end of the inductor L3 is connected to one end of the inductor L1 and one end of the capacitor C1. The other end of the inductor L3 is connected to the drain of the NMOS transistor Q7 and the anode of the diode D8. The cathode of the diode D8 is connected to one end of the capacitor C2 to form the first output terminal of the rectifier module. The source of the NMOS transistor Q7 is connected to the other end of the capacitor C2 to form the second output terminal of the rectifier module.

[0019] A further technical solution is that the boost drive circuit includes a voltage comparator U1, a resistor R1, and an NMOS transistor Q8, wherein...

[0020] The non-inverting input of the voltage comparator U1 is connected to the MCU, the inverting input of the voltage comparator U1 is grounded, the output of the voltage comparator U1 is connected to the gate of the NMOS transistor Q8 through the resistor R1, the power supply terminal of the voltage comparator U1 is connected to the power supply voltage VCC, and the ground terminal of the voltage comparator U1 is grounded.

[0021] The source of the NMOS transistor Q8 is connected to one end of capacitor C1, one end of inductor L1, and one end of inductor L3. The drain of the NMOS transistor Q8 is connected to the cathode of diode D8 and one end of capacitor C2.

[0022] A further technical solution is that the half-bridge conversion module includes NMOS transistors Q9 and Q10, capacitor C3, capacitor C4, resistor R2, and resistor R3, wherein...

[0023] The drain of NMOS transistor Q9 is connected to the first output terminal of the rectifier module, the source of NMOS transistor Q9 is connected to the drain of NMOS transistor Q10, and the source of NMOS transistor Q10 is connected to the second output terminal of the rectifier module.

[0024] One end of capacitor C3 is connected to the drain of NMOS transistor Q9, and the other end of capacitor C3 is connected to one end of capacitor C4, the source of NMOS transistor Q9, and the drain of NMOS transistor Q10. The other end of capacitor C4 is connected to the source of NMOS transistor Q10. Resistor R2 is connected in parallel with capacitor C3, and resistor R3 is connected in parallel with capacitor C4.

[0025] A further technical solution is that the half-bridge conversion module also includes capacitor C5, capacitor C6, resistor R4, and transformer T1, wherein,

[0026] The first end of the primary winding of transformer T1 is connected to one end of capacitor C5, one end of resistor R2, one end of capacitor C3 and the drain of NMOS transistor Q9, and the second end of the primary winding of transformer T1 is connected to the source of NMOS transistor Q9 and the drain of NMOS transistor Q10.

[0027] One end of capacitor C5 is connected to the first end of the secondary winding of transformer T1 through capacitor C6, and resistor R4 is connected in parallel with capacitor C6.

[0028] A further technical solution is that the half-bridge conversion module further includes NMOS transistors Q11, Q12, Q13, and Q14, wherein...

[0029] The source of NMOS transistor Q11 is connected to the drain of NMOS transistor Q12 and the second end of the secondary winding of transformer T1. The source of NMOS transistor Q12 is connected to the source of NMOS transistor Q14. The drain of NMOS transistor Q13 is connected to the drain of NMOS transistor Q11. The source of NMOS transistor Q13 is connected to the third end of the secondary winding of transformer T1 and the source of NMOS transistor Q14.

[0030] A further technical solution is that the half-bridge conversion module also includes a Schottky diode T2, a Schottky diode T3, a common-mode choke L4, a capacitor C7, a capacitor C8, a resistor R5, a resistor R6, and a capacitor C9, wherein...

[0031] The positive terminal of the Schottky diode T2 is connected to the drain of NMOS transistor Q11, the drain of NMOS transistor Q13, and the first input terminal of common-mode choke L4. The negative terminal of the Schottky diode T2 is connected to the first output terminal of common-mode choke L4 through capacitor C7. The resistor R5 is connected in parallel with capacitor C7.

[0032] A further technical solution is as follows: the negative terminal of the Schottky diode T3 is connected to the source of the NMOS transistor Q12, the source of the NMOS transistor Q14, and the second input terminal of the common-mode choke L4; the positive terminal of the Schottky diode T3 is connected to the second output terminal of the common-mode choke L4 through the capacitor C8; the resistor R6 is connected in parallel with the capacitor C8; one end of the capacitor C9 is connected to the first output terminal of the common-mode choke L4 to form the output terminal of the DC output voltage; and the other end of the capacitor C9 is connected to the second output terminal of the common-mode choke L4 and grounded.

[0033] The beneficial technical effects of this utility model are:

[0034] The high-stability power module provided by this invention incorporates a boost circuit and a boost drive circuit within the DC module. This allows it to operate in response to fluctuations in the AC input voltage, maintaining a stable DC bus voltage and preventing frequent power outages in downstream circuits due to AC input voltage fluctuations. While fulfilling basic functions such as voltage conversion, the power module exhibits greater tolerance to mains voltage fluctuations. It expands the input voltage range of the power module without altering the original component selection or affecting the performance of the original circuit design, thereby improving its operational stability. Attached Figure Description

[0035] Figure 1 This is a connection topology diagram of one embodiment of the power module provided by this utility model in application.

[0036] Figure 2 This is a schematic diagram of one embodiment of the high-stability power module provided by this utility model.

[0037] Figure 3 This is a circuit schematic diagram of one embodiment of the rectifier module provided by this utility model.

[0038] Figure 4 This is a circuit diagram of one embodiment of the half-bridge conversion module provided by this utility model. Detailed Implementation

[0039] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0040] This utility model provides a high-stability power module, including a rectifier module and a half-bridge conversion module that are adapted and connected, both of which are connected to an MCU.

[0041] The rectifier module is used to convert the AC input voltage into a DC bus voltage and output it to the half-bridge conversion module. The half-bridge conversion module is used to convert the DC bus voltage into the required DC output voltage.

[0042] The rectifier module includes a three-phase rectifier circuit 1, a boost circuit 3, and a boost drive circuit 2 that are adapted and connected. Based on the AC input voltage, the MCU controls the working state of the three-phase rectifier circuit 1 and controls the working state of the boost circuit 3 through the boost drive circuit 2 to keep the DC bus voltage stable.

[0043] Specifically, in practical applications, the power module is connected between the power grid and the terminal equipment, converting the AC input voltage provided by the power grid into a DC output voltage to power the terminal equipment. Figure 1The diagram shows the connection topology of the power module in application. The AC input voltage output from the power grid is usually filtered by the filter module before being input to the power module. In this embodiment, the power module is designed to convert the 115V AC input voltage into a 48V DC output voltage to power the terminal equipment.

[0044] As is known from the background technology, the AC input voltage output from the power grid fluctuates due to factors such as the connection of high-power loads, causing the AC input voltage to exceed the normal operating voltage range of the power supply module. To avoid the DC bus voltage fluctuating with the AC input voltage and affecting subsequent circuits, the power supply module provided by this invention uses an MCU to detect the magnitude of the AC input voltage in real time. When the AC input voltage is lower than the minimum normal operating voltage, the boost drive circuit 2 controls the boost circuit 3 to boost the voltage after rectification by the three-phase rectifier circuit 1, so that the DC bus voltage is not affected by the decrease in AC input voltage. When the AC input voltage is greater than the maximum normal operating voltage, the MCU controls the boost circuit 3 to not operate through the boost drive circuit 2, and controls the three-phase rectifier circuit 1 to operate as a buck circuit while rectifying, so as to keep the DC bus voltage stable. When the AC input voltage is within the normal operating voltage range of the power supply module, the MCU also controls the boost circuit 3 to not operate through the boost drive circuit 2. The method by which the MCU controls the operating state of the three-phase rectifier circuit 1, and the method by which the boost drive circuit 2 controls the operating state of the boost circuit 3, can be referred to the following description.

[0045] Figure 3 A circuit schematic diagram of one embodiment of the rectifier module is shown. The three-phase rectifier circuit 1 includes phase A bridge arm, phase B bridge arm, and phase C bridge arm, wherein...

[0046] The A-phase bridge arm includes an NMOS transistor Q1, a diode D1, an NMOS transistor Q2, and a diode D2. The drain of the NMOS transistor Q1 is connected to the cathode of the diode D1. The anode of the diode D1 is connected to the source of the NMOS transistor Q2 and connected to the A-phase AC bus. The cathode of the diode D2 is connected to the drain of the NMOS transistor Q2.

[0047] The B-phase bridge arm includes NMOS transistor Q3, diode D3, NMOS transistor Q4, and diode D4. The source of NMOS transistor Q3 is connected to the source of NMOS transistor Q1, the drain of NMOS transistor Q3 is connected to the cathode of diode D3, the anode of diode D3 is connected to the source of NMOS transistor Q4 and connected to the B-phase AC bus, the cathode of diode D4 is connected to the drain of NMOS transistor Q4, and the anode of diode D4 is connected to the anode of diode D2.

[0048] The C-phase bridge arm includes NMOS transistor Q5, diode D5, NMOS transistor Q6, and diode D6. The source of NMOS transistor Q5 is connected to the source of NMOS transistor Q3, the drain of NMOS transistor Q5 is connected to the cathode of diode D5, the anode of diode D5 is connected to the source of NMOS transistor Q6 and connected to the C-phase AC bus, the cathode of diode D6 is connected to the drain of NMOS transistor Q6, and the anode of diode D6 is connected to the anode of diode D4.

[0049] The three-phase rectifier circuit also includes diode D7, inductor L1, inductor L2, and capacitor C1. The cathode of diode D7 is connected to one end of inductor L1 and the source of NMOS transistor Q5. The anode of diode D7 is connected to one end of inductor L2 and the anode of diode D6. One end of capacitor C1 is connected to the other end of inductor L1, and the other end of capacitor C1 is connected to the other end of inductor L2.

[0050] For each phase of the AC input voltage, a pair of NMOS transistors are used for synchronous rectification. Each NMOS transistor is connected to a corresponding diode, which serves as a protection mechanism to prevent reverse current flow when the NMOS transistor is turned on. The gates of NMOS transistors Q1-Q6 are all connected to the MCU. The MCU inputs an SPWM modulation wave to the gates of NMOS transistors Q1-Q6 to control the three-phase rectifier circuit to rectify the AC input voltage. The two NMOS transistors in each bridge arm are controlled by a set of SPWM modulation waves. The waveform of the SPWM modulation wave is consistent with the waveform of each phase input voltage. The voltage across capacitor C1 is the rectified DC output voltage.

[0051] Furthermore, the boost circuit 2 includes an NMOS transistor Q7, a diode D8, a capacitor C2, and an inductor L3, wherein,

[0052] One end of the inductor L3 is connected to one end of the inductor L1 and one end of the capacitor C1. The other end of the inductor L3 is connected to the drain of the NMOS transistor Q7 and the anode of the diode D8. The cathode of the diode D8 is connected to one end of the capacitor C2 to form the first output terminal of the rectifier module. The source of the NMOS transistor Q7 is connected to the other end of the capacitor C2 to form the second output terminal of the rectifier module.

[0053] The boost drive circuit 2 includes a voltage comparator U1, a resistor R1, and an NMOS transistor Q8. The non-inverting input of the voltage comparator U1 is connected to the MCU, the inverting input is grounded, and the output is connected to the gate of the NMOS transistor Q8 through the resistor R1. The power supply of the voltage comparator U1 is connected to the power supply voltage VCC, and the ground is grounded. The source of the NMOS transistor Q8 is connected to one end of the capacitor C1, one end of the inductor L1, and one end of the inductor L3. The drain of the NMOS transistor Q8 is connected to the cathode of the diode D8 and one end of the capacitor C2.

[0054] Specifically, the MCU outputs a SWITCH signal to the voltage comparator U1. When the MCU detects that the AC input voltage is within the normal operating voltage range of the power supply module, it outputs a high-level SWITCH signal to the voltage comparator U1. At this time, the output of the voltage comparator U1 outputs a high-level signal to the NMOS transistor Q8, which turns on and short-circuits the boost circuit 3, causing the boost circuit 3 to stop working. At this time, the voltage rectified by the three-phase rectifier circuit 1 is the DC bus voltage.

[0055] When the MCU detects that the AC input voltage is greater than the maximum normal operating voltage, the MCU controls the NMOS transistor Q8 to turn on in the same way as described above. The boost circuit 3 is not working, and the voltage rectified by the three-phase rectifier circuit 1 is the DC bus voltage. At this time, in order to keep the current DC bus voltage consistent with the DC bus voltage before the AC input voltage increases, the MCU changes the pulse width of the SPWM so that the three-phase rectifier circuit 1 also performs a step-down function, thereby keeping the DC bus voltage stable.

[0056] When the MCU detects that the AC input voltage is lower than the minimum normal operating voltage, it outputs a low-level SWITCH signal to the voltage comparator U1. At this time, the output of the voltage comparator U1 outputs a low-level signal to the NMOS transistor 18, turning off the NMOS transistor 18 and thus starting the boost circuit 3. The gate of the NMOS transistor Q7 in the boost circuit 3 is connected to the MCU. The MCU controls the NMOS transistor Q7 to switch between the on and off states through a PWM signal. When the NMOS transistor Q7 is on, the rectified DC voltage is delivered through inductor L3, which stores energy. After the NMOS transistor Q7 is turned off, the energy in inductor L3 is released through the freewheeling diode D8, charging capacitor C2 to boost the voltage after rectification by the three-phase rectifier circuit 1, keeping the DC bus voltage stable. At this time, the voltage across capacitor C2 is the DC bus voltage.

[0057] Furthermore, the half-bridge conversion module includes NMOS transistors Q9 and Q10, capacitors C3 and C4, resistors R2 and R3, wherein...

[0058] The drain of NMOS transistor Q9 serves as the first input terminal of the half-bridge conversion module and is connected to the first output terminal of the rectifier module via a DC positive bus. The source of NMOS transistor Q9 is connected to the drain of NMOS transistor Q10. The source of NMOS transistor Q10 serves as the second input terminal of the half-bridge conversion module and is connected to the second output terminal of the rectifier module via a DC negative bus.

[0059] One end of capacitor C3 is connected to the drain of NMOS transistor Q9, and the other end of capacitor C3 is connected to one end of capacitor C4, the source of NMOS transistor Q9, and the drain of NMOS transistor Q10. The other end of capacitor C4 is connected to the source of NMOS transistor Q10. Resistor R2 is connected in parallel with capacitor C3, and resistor R3 is connected in parallel with capacitor C4.

[0060] The half-bridge conversion module also includes capacitor C5, capacitor C6, resistor R4, and transformer T1. The first end of the primary winding of transformer T1 is connected to one end of capacitor C5, one end of resistor R2, one end of capacitor C3, and the drain of NMOS transistor Q9. The second end of the primary winding of transformer T1 is connected to the source of NMOS transistor Q9 and the drain of NMOS transistor Q10.

[0061] One end of capacitor C5 is connected to the first end of the secondary winding of transformer T1 through capacitor C6, and resistor R4 is connected in parallel with capacitor C6.

[0062] Figure 4 A circuit diagram of one embodiment of a half-bridge converter module is shown. In this embodiment, the half-bridge converter module is used to convert the DC bus voltage to a 48V DC output voltage. The gates of NMOS transistors Q9 and Q10 are connected to the MCU. The MCU outputs a PWM signal to control NMOS transistors Q9 and Q10 to conduct alternately, causing an AC voltage to be generated on the primary winding of transformer T1, thereby generating a corresponding AC voltage on the secondary winding of transformer T1. Transformer T1 is used to isolate the DC bus voltage input side from the DC output voltage output side, thereby improving the overall reliability and safety of the power module.

[0063] The half-bridge converter module also includes a rectifier circuit formed by NMOS transistors Q11, Q12, Q13, and Q14.

[0064] The source of NMOS transistor Q11 is connected to the drain of NMOS transistor Q12 and the second end of the secondary winding of transformer T1. The source of NMOS transistor Q12 is connected to the source of NMOS transistor Q14. The drain of NMOS transistor Q13 is connected to the drain of NMOS transistor Q11. The source of NMOS transistor Q13 is connected to the third end of the secondary winding of transformer T1 and the source of NMOS transistor Q14.

[0065] Specifically, the first, second, and third terminals of the secondary winding of transformer T1 are sequentially arranged. A rectifier circuit formed by NMOS transistors Q11, Q12, Q13, and Q14 converts the AC voltage generated by the secondary winding of transformer T1 into the required DC output voltage. The DC output voltage is determined by the duty cycle of the PWM signals driving NMOS transistors Q9 and Q10. The MCU acquires the DC output voltage in real time, increasing the duty cycle when the DC output voltage is too high and decreasing it when the DC output voltage is too low, so that the final output DC voltage is maintained at the required 48V.

[0066] Furthermore, before the DC output voltage is output to the terminal equipment, a combination circuit consisting of Schottky diode T2, Schottky diode T3, common mode choke L4, capacitor C7, capacitor C8, resistor R5, resistor R6, and capacitor C9 is used to reduce the ripple of the DC output voltage in order to improve the power supply output characteristics.

[0067] Specifically, the anode of Schottky diode T2 is connected to the drain of NMOS transistors Q11 and Q13, and the first input terminal of common-mode choke L4. The cathode of Schottky diode T2 is connected to the first output terminal of common-mode choke L4 through capacitor C7. Resistor R5 is connected in parallel with capacitor C7. The cathode of Schottky diode T3 is connected to the source of NMOS transistors Q12 and Q14, and the second input terminal of common-mode choke L4. The anode of Schottky diode T3 is connected to the second output terminal of common-mode choke L4 through capacitor C8. Resistor R6 is connected in parallel with capacitor C8. One end of capacitor C9 is connected to the first output terminal of common-mode choke L4 to form the output terminal of DC output voltage, and the other end of capacitor C9 is connected to the second output terminal of common-mode choke L4 and grounded.

[0068] The above descriptions are merely preferred embodiments of the present invention, and the present invention is not limited to the above embodiments. It is understood that other improvements and variations that can be directly derived or conceived by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included within the protection scope of the present invention.

Claims

1. A high-stability power supply module, characterized in that, It includes a rectifier module and a half-bridge converter module that are adapted for connection, both of which are connected to the MCU; The rectifier module is used to convert the AC input voltage into a DC bus voltage and output it to the half-bridge conversion module. The half-bridge conversion module is used to convert the DC bus voltage into the required DC output voltage. The rectifier module includes a three-phase rectifier circuit, a boost circuit, and a boost drive circuit that are adapted and connected. Based on the AC input voltage, the MCU controls the operating state of the three-phase rectifier circuit and controls the operating state of the boost circuit through the boost drive circuit to keep the DC bus voltage stable.

2. The high-stability power supply module according to claim 1, characterized in that, The three-phase rectifier circuit includes phase A, phase B, and phase C bridge arms, wherein... The A-phase bridge arm includes an NMOS transistor Q1, a diode D1, an NMOS transistor Q2, and a diode D2. The drain of the NMOS transistor Q1 is connected to the cathode of the diode D1. The anode of the diode D1 is connected to the source of the NMOS transistor Q2 and connected to the A-phase AC bus. The cathode of the diode D2 is connected to the drain of the NMOS transistor Q2. The B-phase bridge arm includes NMOS transistor Q3, diode D3, NMOS transistor Q4, and diode D4. The source of NMOS transistor Q3 is connected to the source of NMOS transistor Q1, the drain of NMOS transistor Q3 is connected to the cathode of diode D3, the anode of diode D3 is connected to the source of NMOS transistor Q4 and connected to the B-phase AC bus, the cathode of diode D4 is connected to the drain of NMOS transistor Q4, and the anode of diode D4 is connected to the anode of diode D2. The C-phase bridge arm includes NMOS transistor Q5, diode D5, NMOS transistor Q6, and diode D6. The source of NMOS transistor Q5 is connected to the source of NMOS transistor Q3, the drain of NMOS transistor Q5 is connected to the cathode of diode D5, the anode of diode D5 is connected to the source of NMOS transistor Q6 and connected to the C-phase AC bus, the cathode of diode D6 is connected to the drain of NMOS transistor Q6, and the anode of diode D6 is connected to the anode of diode D4.

3. The high-stability power supply module according to claim 2, characterized in that, The three-phase rectifier circuit also includes diode D7, inductor L1, inductor L2, and capacitor C1, wherein... The cathode of diode D7 is connected to one end of inductor L1 and the source of NMOS transistor Q5. The anode of diode D7 is connected to one end of inductor L2 and the anode of diode D6. One end of capacitor C1 is connected to the other end of inductor L1, and the other end of capacitor C1 is connected to the other end of inductor L2.

4. The high-stability power supply module according to claim 1, characterized in that, The boost circuit includes an NMOS transistor Q7, a diode D8, a capacitor C2, and an inductor L3, wherein... One end of the inductor L3 is connected to one end of the inductor L1 and one end of the capacitor C1. The other end of the inductor L3 is connected to the drain of the NMOS transistor Q7 and the anode of the diode D8. The cathode of the diode D8 is connected to one end of the capacitor C2 to form the first output terminal of the rectifier module. The source of the NMOS transistor Q7 is connected to the other end of the capacitor C2 to form the second output terminal of the rectifier module.

5. The high-stability power supply module according to claim 4, characterized in that, The boost drive circuit includes a voltage comparator U1, a resistor R1, and an NMOS transistor Q8, wherein... The non-inverting input of the voltage comparator U1 is connected to the MCU, the inverting input of the voltage comparator U1 is grounded, the output of the voltage comparator U1 is connected to the gate of the NMOS transistor Q8 through the resistor R1, the power supply terminal of the voltage comparator U1 is connected to the power supply voltage VCC, and the ground terminal of the voltage comparator U1 is grounded. The source of the NMOS transistor Q8 is connected to one end of capacitor C1, one end of inductor L1, and one end of inductor L3. The drain of the NMOS transistor Q8 is connected to the cathode of diode D8 and one end of capacitor C2.

6. The high-stability power supply module according to claim 4, characterized in that, The half-bridge conversion module includes NMOS transistors Q9 and Q10, capacitor C3, capacitor C4, resistor R2, and resistor R3. The drain of NMOS transistor Q9 is connected to the first output terminal of the rectifier module, the source of NMOS transistor Q9 is connected to the drain of NMOS transistor Q10, and the source of NMOS transistor Q10 is connected to the second output terminal of the rectifier module. One end of capacitor C3 is connected to the drain of NMOS transistor Q9, and the other end of capacitor C3 is connected to one end of capacitor C4, the source of NMOS transistor Q9, and the drain of NMOS transistor Q10. The other end of capacitor C4 is connected to the source of NMOS transistor Q10. Resistor R2 is connected in parallel with capacitor C3, and resistor R3 is connected in parallel with capacitor C4.

7. The high-stability power supply module according to claim 6, characterized in that, The half-bridge converter module also includes capacitor C5, capacitor C6, resistor R4, and transformer T1, wherein... The first end of the primary winding of transformer T1 is connected to one end of capacitor C5, one end of resistor R2, one end of capacitor C3 and the drain of NMOS transistor Q9, and the second end of the primary winding of transformer T1 is connected to the source of NMOS transistor Q9 and the drain of NMOS transistor Q10. One end of capacitor C5 is connected to the first end of the secondary winding of transformer T1 through capacitor C6, and resistor R4 is connected in parallel with capacitor C6.

8. The high-stability power supply module according to claim 7, characterized in that, The half-bridge conversion module also includes NMOS transistors Q11, Q12, Q13, and Q14, wherein... The source of NMOS transistor Q11 is connected to the drain of NMOS transistor Q12 and the second end of the secondary winding of transformer T1. The source of NMOS transistor Q12 is connected to the source of NMOS transistor Q14. The drain of NMOS transistor Q13 is connected to the drain of NMOS transistor Q11. The source of NMOS transistor Q13 is connected to the third end of the secondary winding of transformer T1 and the source of NMOS transistor Q14.

9. The high-stability power supply module according to claim 8, characterized in that, The half-bridge converter module also includes Schottky diode T2, Schottky diode T3, common-mode choke L4, capacitor C7, capacitor C8, resistor R5, resistor R6, and capacitor C9, wherein... The positive terminal of the Schottky diode T2 is connected to the drain of NMOS transistor Q11, the drain of NMOS transistor Q13, and the first input terminal of common-mode choke L4. The negative terminal of the Schottky diode T2 is connected to the first output terminal of common-mode choke L4 through capacitor C7. The resistor R5 is connected in parallel with capacitor C7.

10. The high-stability power supply module according to claim 9, characterized in that, The negative terminal of the Schottky diode T3 is connected to the source of NMOS transistor Q12, the source of NMOS transistor Q14, and the second input terminal of common-mode choke L4. The positive terminal of the Schottky diode T3 is connected to the second output terminal of common-mode choke L4 through capacitor C8. The resistor R6 is connected in parallel with capacitor C8. One end of capacitor C9 is connected to the first output terminal of common-mode choke L4 to form the output terminal of DC output voltage. The other end of capacitor C9 is connected to the second output terminal of common-mode choke L4 and grounded.

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