AC-DC intelligent voltage regulation power supply for wind power variable pitch system

Abstract

The utility model discloses an AC-DC intelligent voltage regulation power supply used for a wind power variable pitch system, comprising a weak current module, a strong current module, an AC input current-limiting voltage module and a common mode filtering module, the AC input current-limiting voltage module is connected with the common mode filtering module, the weak current module and the strong current module are both connected with the common mode filtering module, and the common mode filtering module is connected with the weak current module. The weak current module is connected with the strong current module, the weak current module adopts a circuit integrating three-phase full-bridge rectification, PFC control and LLC control, the strong current module adopts a circuit integrating three-phase full-bridge rectification, PFC control, LLC control, current detection and common-mode filtering output, and the weak current module is used for providing a weak current power supply. And the strong current module is used for providing a middle-high voltage power supply with an adjustable wide voltage range. According to the utility model, the safety and the reliability of the power supply are improved, a 150-550VDC power supply and a charging power supply are provided for the wind power fan blade variable-pitch motor and the super capacitor, the power supply efficiency is improved, and the energy waste is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of AC-DC intelligent voltage regulating power supply for wind power variable pitch system. BACKGROUND

[0002] Wind power wind blade variable pitch drive system, for security, need spare DC power supply, currently mostly use spare battery or super capacitor, these spare power supply can provide energy when main power supply is unexpectedly powered off, let motor drag blade to safe position safe shutdown. Since super capacitor has the characteristics of higher reliability, charging current, currently more suitable as spare power supply, the drive power supply of variable pitch motor is mostly rectification+inversion mode, thus spare battery or super capacitor needs to be charged, very cumbersome, the safety of power supply is low, the interference to front end is too big, the reliability of communication is low, cost is high, maintainability is low. CONTENT OF UTILITY MODEL

[0003] The utility model aims at solving the problems in the above background technical, provide a kind of AC-DC intelligent voltage regulating power supply for wind power variable pitch system.

[0004] To achieve the above purpose, the utility model is implemented by the following technical solutions:

[0005] A kind of AC-DC intelligent voltage regulating power supply for wind power variable pitch system, including weak current module, strong current module, alternating current input current-limiting voltage module, common mode filter module, the alternating current input current-limiting voltage module is connected common mode filter module, weak current module, strong current module are all connected common mode filter module, weak current module connects strong current module, weak current module adopts the circuit of three-phase full-bridge rectification, PFC control and LLC control and integration, strong current module adopts the circuit of three-phase full-bridge rectification, PFC control, LLC control, current detection and common mode filter output integration, weak current module is used to provide weak current power supply, strong current module is used to provide the adjustable middle-high voltage power supply of wide voltage range.

[0006] As preferred, the weak current module comprises a first three-phase rectifier circuit, a first DC high-voltage branch, a second DC high-voltage branch, a flyback switching power supply circuit, a flyback transformer, a secondary side low-voltage output circuit, a primary side auxiliary power supply, a master control chip circuit, a first isolation communication circuit, a second isolation communication circuit, a PFC drive circuit, a PFC and LLC integrated control chip, an LLC drive circuit, an LLC resonant circuit, a primary side power supply filter circuit, an LLC transformer, a secondary side LLC resonant rectifier output circuit, a brake output filter circuit, a brake voltage detection circuit, a CAN communication isolation circuit, and a CAN communication interface. The first DC high-voltage branch and the second DC high-voltage branch are connected to the first three-phase rectifier circuit. The first three-phase rectifier circuit is connected to a common mode filter module. The first DC high-voltage branch is connected to the flyback transformer through the flyback switching power supply circuit. The flyback transformer is connected to the master control chip circuit through the secondary side low-voltage output circuit. The first isolation communication circuit and the second isolation communication circuit are both connected to the master control chip circuit. The primary side auxiliary power supply is connected to the second DC high-voltage branch through the PFC drive circuit. The PFC drive circuit is connected to the LLC drive circuit through the PFC and LLC integrated control chip. The LLC drive circuit is connected to the primary side power supply filter circuit through the LLC resonant circuit. The primary side power supply filter circuit is connected to the secondary side LLC resonant rectifier output circuit through the LLC transformer. The secondary side LLC resonant rectifier output circuit is connected to the brake voltage detection circuit through the brake output filter circuit. The brake voltage detection circuit, the primary side auxiliary power supply, and the CAN communication isolation circuit are all connected to the master control chip circuit. The CAN communication interface is connected to the CAN communication isolation circuit.

[0007] As preferred, the strong current module comprises a second three-phase rectifier circuit, a PFC control circuit, a phase-shifted full-bridge control circuit, a full-bridge LLC control circuit, a third DC high-voltage branch, a phase-shifted full-bridge transformer, a first full-bridge rectifier output circuit, an energy storage filter circuit, an LLC transformer, a second full-bridge rectifier output circuit, a common-mode filter output circuit, a current sensor circuit, a PFC detection circuit, a primary voltage detection circuit, a secondary voltage detection circuit, the second three-phase rectifier circuit is connected with the common-mode filter module, the phase-shifted full-bridge control circuit is connected with the third DC high-voltage branch, the second three-phase rectifier circuit is connected with the phase-shifted full-bridge transformer through the third DC high-voltage branch, the phase-shifted full-bridge transformer is connected with the energy storage filter circuit through the first full-bridge rectifier output circuit, the energy storage filter circuit is connected with the second full-bridge rectifier output circuit through the LLC transformer, the second full-bridge rectifier output circuit is connected with the common-mode filter output circuit, the PFC control circuit and the phase-shifted full-bridge transformer are both connected with the third DC high-voltage branch, the PFC control circuit and the phase-shifted full-bridge transformer are both connected with the first isolation communication circuit, the energy storage filter circuit and the first isolation communication circuit are both connected with the full-bridge LLC control circuit, the second isolation communication circuit and the common-mode filter output circuit are both connected with the current sensor circuit, the second isolation communication circuit and the PFC detection circuit are both connected with the third DC high-voltage branch, the primary voltage detection circuit is connected with the full-bridge rectifier output circuit, and the secondary voltage detection circuit is connected with the second isolation communication circuit.

[0008] As preferred, the first three-phase rectifier circuit comprises a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a capacitor C1, a resistor R1, a resistor R2, and an inductor L1, the positive electrode of the diode D1 is connected with the negative electrode of the diode D4, the negative electrode of the diode D1 is connected with the negative electrode of the diode D2, the positive electrode of the diode D2 is connected with the negative electrode of the diode D5, the negative electrode of the diode D2 is connected with the negative electrode of the diode D3, the positive electrode of the diode D3 is connected with the negative electrode of the diode D6, the positive electrode of the diode D2 is connected with the positive electrode of the diode D5, the positive electrode of the diode D5 is connected with the positive electrode of the diode D6, the negative electrode of the diode D3 is connected with the negative electrode of the diode D6 through the capacitor C1, the resistor R1 and the inductor L1 are connected in series and then connected with the capacitor C1 in parallel, and the resistor R2 is connected with the capacitor C1 in parallel.

[0009] As preferred, the secondary voltage detection circuit comprises resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, MOS tube Q1, triode Q2, triode Q3, diode D7, controller, capacitor C2, capacitor C3, one end of the resistance R3 is connected with power supply VCC, the other end of the resistance R3 is connected with the G electrode of the MOS tube Q1, the S electrode of the MOS tube Q1 is connected with the power supply VCC, the D electrode of the MOS tube Q1 is connected with one end of the resistance R5 through the resistance R4, the other end of the resistance R5 is connected with the ground signal GND, the capacitor C2 and the capacitor C3 are both connected with the resistance R5 in parallel, the G electrode of the MOS tube Q1 is connected with the collector of the triode Q2, the emitter of the triode Q2 is connected with the ground signal GND through the resistance R6, the base of the triode Q2 is connected with the collector of the triode Q3 through the resistance R8, the emitter of the triode Q3 is connected with the ground signal GND, the base of the triode Q3 is connected with the ground signal GND through the resistance R7, and the base of the triode Q2 is connected with the controller through the diode D7.

[0010] As preferred, the MOS tube Q1 is a P channel MOS tube, and the triode Q2 and the triode Q3 are both NPN triodes.

[0011] As preferred, the diode D7 is a voltage stabilizing diode.

[0012] As preferred, the medium and high voltage power supply is a direct current power supply between 150V and 550V.

[0013] The utility model discloses a beneficial effect as follows: the utility model discloses an AC-DC controllable intelligent power supply, which can solve the super capacitor charging problem, save the rectifier unit of the variable pitch drive, increase the safety and reliability of the power supply, reduce the ripple and harmonic of the power supply bus, greatly reduce the interference of the front end, improve the reliability of communication, reduce the cost, enable the system to control and detect the power output, improve the safety and maintainability of the system;The utility model provides 150~550VDC power supply and charging power supply for wind power wind blade variable pitch motor and super capacitor;The utility model improves the power efficiency and reduces energy waste. As a medium and high voltage power supply and weak current power supply integrated in a wide voltage range, the utility model provides a strong market supplement for novel digital adjustable power supply products. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the system block diagram of the utility model;

[0015] Figure 2 It is the circuit principle diagram of the first three-phase rectifier circuit;

[0016] Figure 3 Circuit schematic diagram of secondary voltage detection circuit. DETAILED DESCRIPTION

[0017] The technical scheme of the utility model will be further explained in combination with the drawings of the specification:

[0018] As Figure 1 shown, an AC-DC intelligent voltage regulating power supply for a wind power variable pitch system, comprising a weak current module, a strong current module, an alternating current input current limiting voltage module 23, a common mode filter module 24, the alternating current input current limiting voltage module 23 is connected with the common mode filter module 24, the weak current module and the strong current module are both connected with the common mode filter module 24, the weak current module is connected with the strong current module, the weak current module adopts a circuit integrating three-phase full-bridge rectification, PFC control and LLC control, the strong current module adopts a circuit integrating three-phase full-bridge rectification, PFC control, LLC control, current detection and common mode filter output, the weak current module is used for providing a weak current power supply, and the strong current module is used for providing a medium-high voltage power supply with a wide voltage range and adjustable.

[0019] As Figure 1 , Figure 2As shown, the weak current module includes a first three-phase rectifier circuit 1, a first DC high voltage branch 2, a second DC high voltage branch 3, a flyback switching power supply circuit 4, a flyback transformer 6, a secondary side low voltage output circuit 7, a primary side auxiliary power supply 5, a master control chip circuit 8, a first isolation communication circuit 15, a second isolation communication circuit 16, a PFC drive circuit 10, a PFC and LLC integrated control chip 12, an LLC drive circuit 13, an LLC resonant circuit 9, a primary side power supply filter circuit 17, an LLC transformer 18, a secondary side LLC resonant rectifier output circuit 19, a brake output filter circuit 20, a brake voltage detection circuit 14, a CAN communication isolation circuit 21, and a CAN communication interface 22. The first DC high voltage branch 2 and the second DC high voltage branch 3 are connected to the first three-phase rectifier circuit 1. The first three-phase rectifier circuit 1 is connected to a common mode filter module 24. The first DC high voltage branch 2 is connected to the flyback transformer 6 through the flyback switching power supply circuit 4. The flyback transformer 6 is connected to the master control chip circuit 8 through the secondary side low voltage output circuit 7. The first isolation communication circuit 15 and the second isolation communication circuit 16 are both connected to the master control chip circuit 8. The primary side auxiliary power supply 5 is connected to the second DC high voltage branch 3 through the PFC drive circuit 10. The PFC drive circuit 10 is connected to the LLC drive circuit 13 through the PFC and LLC integrated control chip 12. The LLC drive circuit 13 is connected to the primary side power supply filter circuit 17 through the LLC resonant circuit 9. The primary side power supply filter circuit 17 is connected to the secondary side LLC resonant rectifier output circuit 19 through the LLC transformer 18. The secondary side LLC resonant rectifier output circuit 19 is connected to the brake voltage detection circuit 14 through the brake output filter circuit 20. The brake voltage detection circuit 14, the primary side auxiliary power supply 5, and the CAN communication isolation circuit 21 are all connected to the master control chip circuit 8. The CAN communication interface 22 is connected to the CAN communication isolation circuit 21.

[0020] As Figure 1 , Figure 2As shown, the high-voltage module includes a second three-phase rectifier circuit 27, a PFC control circuit 25, a phase-shifting full-bridge control circuit 26, a full-bridge LLC control circuit 31, a third DC high-voltage branch 28, a phase-shifting full-bridge transformer 29, a first full-bridge rectifier output circuit 30, an energy storage filter circuit 36, an LLC transformer 18, a second full-bridge rectifier output circuit 33, a common-mode filter output circuit 35, a current sensor circuit 34, a PFC detection circuit 37, a primary voltage detection circuit 38, and a secondary voltage detection circuit 39. The second three-phase rectifier circuit 27 is connected to the common-mode filter module 24. The phase-shifting full-bridge control circuit 26 is connected to the third DC high-voltage branch 28. The second three-phase rectifier circuit 27 is connected to the phase-shifting full-bridge transformer 29 through the third DC high-voltage branch 28. The phase-shifting full-bridge transformer 29 is connected to the energy storage filter circuit 36 ​​through the first full-bridge rectifier output circuit 30. 6. The energy storage filter circuit 36 ​​is connected to the second full-bridge rectifier output circuit 33 via LLC transformer 18. The second full-bridge rectifier output circuit 33 is connected to the common-mode filter output circuit 35. The PFC control circuit 25 and the phase-shifting full-bridge transformer 29 are both connected to the third DC high-voltage branch 28. The PFC control circuit 25 and the phase-shifting full-bridge transformer 29 are both connected to the first isolation communication circuit 15. The energy storage filter circuit 36 ​​and the first isolation communication circuit 15 are both connected to the full-bridge LLC control circuit 31. The second isolation communication circuit 16 and the common-mode filter output circuit 35 are both connected to the current sensor circuit 34. The second isolation communication circuit 16 and the PFC detection circuit 37 are both connected to the third DC high-voltage branch 28. The primary voltage detection circuit 38 is connected to the full-bridge rectifier output circuit. The secondary voltage detection circuit 39 is connected to the second isolation communication circuit 16.

[0021] like Figure 2 As shown, the first three-phase rectifier circuit 1 includes diodes D1, D2, D3, D4, D5, and D6, capacitor C1, resistors R1 and R2, and inductor L1. The anode of diode D1 is connected to the cathode of diode D4, the cathode of diode D1 is connected to the cathode of diode D2, the anode of diode D2 is connected to the cathode of diode D5, the cathode of diode D2 is connected to the cathode of diode D3, the anode of diode D3 is connected to the cathode of diode D6, the anode of diode D2 is connected to the anode of diode D5, the anode of diode D5 is connected to the anode of diode D6, the cathode of diode D3 is connected to the cathode of diode D6 through capacitor C1, resistor R1 and inductor L1 are connected in series and then in parallel with capacitor C1, and resistor R2 is connected in parallel with capacitor C1.

[0022] like Figure 3As shown, the secondary voltage detection circuit 39 includes resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8, MOS tube Q1, triode Q2, triode Q3, diode D7, controller 11, capacitor C2, capacitor C3, one end of the resistor R3 is connected with power supply VCC, the other end of the resistor R3 is connected with the G electrode of MOS tube Q1, the S electrode of the MOS tube Q1 is connected with power supply VCC, the D electrode of the MOS tube Q1 is connected with one end of resistor R5 through resistor R4, the other end of the resistor R5 is connected with ground signal GND, the capacitor C2 and capacitor C3 are both connected with resistor R5 in parallel, the G electrode of the MOS tube Q1 is connected with the collector of triode Q2, the emitter of the triode Q2 is connected with ground signal GND through resistor R6, the base of the triode Q2 is connected with the collector of triode Q3 through resistor R8, the emitter of the triode Q3 is connected with ground signal GND, the base of the triode Q3 is connected with ground signal GND through resistor R7, the base of the triode Q2 is connected with controller 11 through diode D7.

[0023] The medium and high voltage power supply is a direct current power supply between 150V and 550V.

[0024] The weak current module adopts three-phase full-bridge rectification, and a brand-new integrated PFC and LLC power supply scheme,

[0025] The strong current module adopts three-phase full-bridge rectification, and a PFC detection and control function is added,

[0026] The output front stage of the utility model adopts the modulation of phase-shift full-bridge, full-bridge rectification and voltage loop, and realizes wide-range voltage modulation.

[0027] The output rear stage of the utility model adopts the modulation of full-bridge LLC + full-bridge rectification and voltage loop, and realizes accurate voltage modulation.

[0028] The terminal output of the utility model adopts current detection and common-mode filter output control, and realizes maximum power output control.

[0029] The strong and weak current Mook input part uniformly uses a three-phase rectification circuit, and solves the signal problem caused by the energy jump of the isolation ground plane.

[0030] The weak current module output part adopts a PFC + LLC integrated chip, and three-phase power input is applied for the first time as the power supply bus of the chip.

[0031] The strong current output part adopts coarse and fine two-stage modulation mode, meets the requirement of output voltage with different precision, and simultaneously adds power modulation algorithm function and CAN communication function, so that the energy utilization efficiency can be maximally guaranteed, manual operation is simplified, and the strong current module adds PFC scheme, so that the input efficiency of the power supply is improved.

[0032] It should be noted that the above enumeration is only one specific embodiment of the present application. Obviously, the present application is not limited to the above embodiments, and there are many variations. In any case, all variations that can be directly derived or inferred from the disclosed content by those skilled in the art should be considered as falling within the scope of the present application.

Claims

1. An AC-DC intelligent voltage regulating power supply for a wind power variable pitch system, characterized in that, The weak current module, the strong current module, the AC input current limiting voltage module (23), the common mode filter module (24), the AC input current limiting voltage module (23) is connected with the common mode filter module (24), the weak current module and the strong current module are connected with the common mode filter module (24), the weak current module is connected with the strong current module, the weak current module adopts the circuit of three-phase full-bridge rectification, PFC control and LLC control, the strong current module adopts the circuit of three-phase full-bridge rectification, PFC control, LLC control, current detection and common mode filter output, the weak current module is used to provide weak current power supply, and the strong current module is used to provide adjustable medium and high voltage power supply with wide voltage range.

2. The AC-DC smart voltage regulating power supply for wind power variable pitch system of claim 1, wherein, The weak current module includes a first three-phase rectifier circuit (1), a first DC high voltage branch (2), a second DC high voltage branch (3), a flyback switching power supply circuit (4), a flyback transformer (6), a secondary side low voltage output circuit (7), a primary side auxiliary power supply (5), a main control chip circuit (8), a first isolation communication circuit (15), a second isolation communication circuit (16), a PFC drive circuit (10), a PFC and LLC integrated control chip (12), an LLC drive circuit (13), an LLC resonant circuit (9), a primary side power filter circuit (17), an LLC transformer (18), a secondary side LLC resonant rectifier output circuit (19), a brake output filter circuit (20), a brake voltage detection circuit (14), a CAN communication isolation circuit (21) and a CAN communication interface (22), the first DC high voltage branch (2) and the second DC high voltage branch (3) are connected with the first three-phase rectifier circuit (1), the first three-phase rectifier circuit (1) is connected with the common mode filter module (24), the first DC high voltage branch (2) is connected with the flyback transformer (6) through the flyback switching power supply circuit (4), the flyback transformer (6) is connected with the main control chip circuit (8) through the secondary side low voltage output circuit (7), the first isolation communication circuit (15) and the second isolation communication circuit (16) are connected with the main control chip circuit (8), the primary side auxiliary power supply (5) is connected with the second DC high voltage branch (3) through the PFC drive circuit (10), the PFC drive circuit (10) is connected with the LLC drive circuit (13) through the PFC and LLC integrated control chip (12), the LLC drive circuit (13) is connected with the primary side power filter circuit (17) through the LLC resonant circuit (9), the primary side power filter circuit (17) is connected with the secondary side LLC resonant rectifier output circuit (19) through the LLC transformer (18), the secondary side LLC resonant rectifier output circuit (19) is connected with the brake voltage detection circuit (14) through the brake output filter circuit (20), the brake voltage detection circuit (14), the primary side auxiliary power supply (5) and the CAN communication isolation circuit (21) are connected with the main control chip circuit (8), and the CAN communication interface (22) is connected with the CAN communication isolation circuit (21).

3. The AC-DC smart voltage regulating power supply for wind power variable pitch system of claim 2, wherein, The strong current module includes a second three-phase rectifier circuit (27), a PFC control circuit (25), a phase-shifted full-bridge control circuit (26), a full-bridge LLC control circuit (31), a third DC high-voltage branch (28), a phase-shifted full-bridge transformer (29), a first full-bridge rectifier output circuit (30), an energy storage filter circuit (36), an LLC transformer (18), a second full-bridge rectifier output circuit (33), a common-mode filter output circuit (35), a current sensor circuit (34), a PFC detection circuit (37), a primary voltage detection circuit (38), and a secondary voltage detection circuit (39). The second three-phase rectifier circuit (27) is connected to the common-mode filter module (24). The phase-shifted full-bridge control circuit (26) is connected to the third DC high-voltage branch (28). The second three-phase rectifier circuit (27) is connected to the phase-shifted full-bridge transformer (29) through the third DC high-voltage branch (28). The phase-shifted full-bridge transformer (29) is connected to the energy storage filter circuit (36) through the first full-bridge rectifier output circuit (30). The energy storage filter circuit (36) is connected to the second full-bridge rectifier output circuit (33) through the LLC transformer (18). The second full-bridge rectifier output circuit (33) is connected to the common-mode filter output circuit (35). The PFC control circuit (25) and the phase-shifted full-bridge transformer (29) are both connected to the third DC high-voltage branch (28). The PFC control circuit (25) and the phase-shifted full-bridge transformer (29) are both connected to the first isolation communication circuit (15). The energy storage filter circuit (36) and the first isolation communication circuit (15) are both connected to the full-bridge LLC control circuit (31). The second isolation communication circuit (16) and the common-mode filter output circuit (35) are both connected to the current sensor circuit (34). The second isolation communication circuit (16) and the PFC detection circuit (37) are both connected to the third DC high-voltage branch (28). The primary voltage detection circuit (38) is connected to the full-bridge rectifier output circuit. The secondary voltage detection circuit (39) is connected to the second isolation communication circuit (16).

4. The AC-DC smart voltage regulating power supply for wind power variable pitch system of claim 3, wherein, The first three-phase rectifier circuit (1) includes diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, capacitor C1, resistor R1, resistor R2, and inductor L1. The positive electrode of diode D1 is connected to the negative electrode of diode D4. The negative electrode of diode D1 is connected to the negative electrode of diode D2. The positive electrode of diode D2 is connected to the negative electrode of diode D5. The negative electrode of diode D2 is connected to the negative electrode of diode D3. The positive electrode of diode D3 is connected to the negative electrode of diode D6. The positive electrode of diode D2 is connected to the positive electrode of diode D5. The positive electrode of diode D5 is connected to the positive electrode of diode D6. The negative electrode of diode D3 is connected to the negative electrode of diode D6 through capacitor C1. Resistor R1 and inductor L1 are connected in series and then connected in parallel with capacitor C1. Resistor R2 is connected in parallel with capacitor C1.

5. The AC-DC smart voltage regulating power supply for wind power variable pitch system of claim 3, wherein, The secondary voltage detection circuit (39) comprises resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, MOS tube Q1, triode Q2, triode Q3, diode D7, controller (11), capacitor C2, capacitor C3, one end of the resistance R3 is connected to power supply VCC, the other end of the resistance R3 is connected to the G electrode of the MOS tube Q1, the S electrode of the MOS tube Q1 is connected to the power supply VCC, the D electrode of the MOS tube Q1 is connected to one end of the resistance R5 through the resistance R4, the other end of the resistance R5 is connected to the ground signal GND, the capacitor C2 and the capacitor C3 are both connected in parallel with the resistance R5, the G electrode of the MOS tube Q1 is connected to the collector of the triode Q2, the emitter of the triode Q2 is connected to the ground signal GND through the resistance R6, the base of the triode Q2 is connected to the collector of the triode Q3 through the resistance R8, the emitter of the triode Q3 is connected to the ground signal GND, the base of the triode Q3 is connected to the ground signal GND through the resistance R7, and the base of the triode Q2 is connected to the controller (11) through the diode D7.

6. The AC-DC smart voltage regulating power supply for wind power variable pitch system of claim 5, wherein, The MOS tube Q1 is a P channel MOS tube, and the triode Q2 and the triode Q3 are both NPN triodes.

7. The AC-DC smart voltage regulating power supply for wind power variable pitch system of claim 4, wherein, The diode D7 is a voltage stabilizing diode.

8. The AC-DC smart voltage regulating power supply for wind power variable pitch system according to any one of claims 1-7, characterized in that, The medium and high voltage power supply is a direct current power supply between 150V and 550V.

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