Electromagnetic brake driving control system of wind turbine blade and method thereof

Abstract

The application discloses a kind of electromagnetic brake drive control systems of wind turbine blade and method thereof, including wind turbine blade drive module, electromagnetic brake drive module being connected with wind turbine blade drive module, and for detecting electromagnetic brake drive module, self-checking control module, self-checking control module is connected with relay, it includes the DC-DC switch detection control circuit for carrying out fault self-checking and control to electromagnetic brake driver, the working state of the present application is to cope with frequent switching and self-checking is carried out to electronic controller simultaneously, can quickly and accurately identify the fault condition of electronic controller in unit when frequently changing pitch, can be adjusted according to fault condition, in the case where electronic relay fails, mechanical relay safety protection circuit is triggered, guarantees that blade stops in safe position, guarantees that toothed belt is not pulled apart, guarantees unit safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind power drive, in particular to a wind power blade electromagnetic brake drive control system and a control method thereof. BACKGROUND

[0002] Since the wind power blade frequently changes the pitch at present, the pitch fault is caused by the electromagnetic brake, the electromagnetic brake drive of the pitch drive is controlled by a mechanical relay alone, although the relay has three contacts inside, the disconnection of any one will make the circuit power off, but with the long-time operation of the unit, the relay contact is oxidized, which easily leads to the slow action of the electromagnetic brake, and the redundant protection design of the electronic type and the mechanical type is also used.

[0003] However, the redundant protection design of the electronic type and the mechanical type at the present stage has the following problems: on the one hand, the mechanical type is used as the main controller, the contact of the mechanical relay is easily oxidized, and on the other hand, the electronic type is used as the main controller, the DC-DC power module is used for driving, the switching times of the electronic triode are also greatly tested when the pitch is frequently changed, and the internal heat dissipation and electrical elements of the DC-DC power module in the packaging mode easily lead to the failure of the electronic electromagnetic brake drive, so the electromagnetic brake drive control system of the wind power blade with the redundant protection design of the electronic type and the mechanical type at the present stage still has the space for further optimization, and therefore the present application provides a wind power blade electromagnetic brake drive control system with self-checking adjustment function and a method thereof. SUMMARY

[0004] In view of the above problems existing in the existing pitch drive, the present application is proposed.

[0005] Therefore, one object of the present application is to provide a wind power blade electromagnetic brake drive control system and a method thereof, which designs an electromagnetic brake drive module and a self-checking control system, and the purpose is to increase the electromagnetic brake drive, the related redundant relay and the self-checking control system, so as to improve the brake circuit reliability of the wind power pitch system.

[0006] To solve the above technical problems, the present application provides the following technical scheme:

[0007] On the one hand, the present application provides a wind power blade electromagnetic brake drive control system, which comprises a wind power blade drive module, an electromagnetic brake drive module connected with the wind power blade drive module, and a self-checking control module for detecting the electromagnetic brake drive module, the electromagnetic brake drive module comprises an electromagnetic brake drive connected in series with the wind power blade drive module, and a relay connected in series with the electromagnetic brake drive;

[0008] The self-checking control module is connected with the relay, and includes a DC-DC switch detection control circuit for fault self-checking and control of the electromagnetic brake driver.

[0009] As a preferred scheme of the present application, the electromagnetic brake driver is used for coping with frequent switching of the wind power paddle driving module, and is configured as a main working device for controlling the wind power paddle driving module; the relay is used for forced manual control in a safety emergency state of the wind power paddle, and is configured as an auxiliary working device of the mechanical relay.

[0010] As a preferred scheme of the present application, the DC-DC switch detection control circuit performs fault self-checking and control, specifically, judges whether the current condition is a safety emergency state through the DC-DC switch detection control circuit, and the safety emergency state is configured to trigger the mechanical relay in a fault condition of the electromagnetic brake driver, to perform a safety protection loop.

[0011] The fault condition includes damage of a switching triode of the electromagnetic brake driver, under-voltage, large fluctuation and high temperature of a switching power supply circuit.

[0012] As a preferred scheme of the present application, the mechanical relay includes a forced manual switch K2 and a grounding resistor R20, the forced manual switch K2 and the grounding resistor R20 are connected in parallel, an output end of the forced manual switch K2 is connected with an input end of the electromagnetic brake driver, and an input end of the forced manual switch K2 is connected with a power supply circuit.

[0013] As a preferred scheme of the present application, the DC-DC switch detection control circuit includes a relay power supply circuit, a voltage detection circuit and an execution circuit.

[0014] The relay power supply circuit includes a DC voltage stabilizing chip, a capacitor C1, a capacitor C2, an inductor L1 and a diode D1; a Vin end of the DC voltage stabilizing chip is connected with a positive pole of a power supply circuit, a first end of the capacitor C1 is connected with the Vin end of the DC voltage stabilizing chip, a second end of the capacitor C1 is connected with a Gn end of the DC voltage stabilizing chip and a negative pole of the power supply circuit, a first end of the capacitor C2 is connected with a Feedback end of the DC voltage stabilizing chip, a second end of the capacitor C2 is connected with the Gn end of the DC voltage stabilizing chip and grounded, a negative pole of the diode D1 is connected with an Out end of the DC voltage stabilizing chip, a positive pole of the diode D1 is connected with the Gn end of the DC voltage stabilizing chip, an input end of the inductor L1 is connected with the Out end of the DC voltage stabilizing chip, and an output end of the inductor L1 is connected with the first end of the capacitor C2 and the execution circuit.

[0015] The voltage detection circuit comprises a voltage detection chip, a resistor R1 and a resistor R2; the In end of the voltage detection chip is connected with the first end of the resistor R1, the second end of the resistor R1 is connected with the positive pole of the power supply circuit, the first end of the resistor R2 is connected with the Gn end of the voltage detection chip, and the Gn end of the voltage detection chip is connected with the negative pole of the power supply circuit, and the second end of the resistor R2 is connected with the resistor R1;

[0016] The execution circuit is connected with the K3 relay and the K4 relay in series, and comprises an NMOS tube; the gate of the NMOS tube is connected with the Out end of the voltage detection chip, the source of the NMOS tube is connected with the Gn end of the voltage detection chip, and the drain of the NMOS tube is connected with the output end of the inductor L1.

[0017] As a preferred scheme of the present application, wherein: the electromagnetic brake driver further comprises a paddle driving output chip and a control input chip, the positive and negative output ends of the paddle driving output chip are connected with the positive and negative input ends of the motor in the wind power paddle driving module, the Vcc end of the control input chip is connected with an external PLC control system, and the Vcc end of the control input chip is connected with the negative pole of a diode D2, the positive pole of the diode D2 is connected with the power supply circuit.

[0018] As a preferred scheme of the present application, wherein: the resistor R1 and the resistor R2 are voltage dividing resistors, the resistance values of the resistor R1 and the resistor R2 are respectively set as 3k ohms and 1k ohms, the internal voltage of the voltage detection circuit is set as 5V, and the fluctuation threshold of the input voltage is set as less than 2.5%.

[0019] In one aspect, the present application provides a control method of an electromagnetic brake driving control system of a wind power paddle, comprising:

[0020] When the paddle needs to be pitched under the condition that the electromagnetic brake driver works normally, a brake release signal is given through a pitch control signal received by the control input chip, the electromagnetic brake driver is controlled through the K3 relay and the K4 relay of the execution circuit, and a paddle output control signal is output through the paddle driving output chip, so that the paddle of the wind power paddle driving module starts to pitch, and in the same way, when the paddle needs to stop, a stop control signal received by the control input chip is used to give a paddle stop signal and control, and the mechanical relay is not used.

[0021] Meanwhile, the self-checking control module in the electromagnetic brake driver works synchronously, the voltage detection circuit in the DC-DC switch detection control circuit detects the voltage in real time when the electromagnetic brake driver works normally, when the voltage drops to the threshold value or the voltage fluctuation is greater than the threshold value, the voltage detection chip changes from high level output to low level output, the fault condition of the electromagnetic brake driver is determined, at this time, the relay in the execution circuit is powered on by the relay power supply circuit, the paddle stop variable pitch signal is given and controlled, when the relay loses power, the K3 relay loop and the K4 relay loop are disconnected at the same time, the internal safety chain of the variable pitch is disconnected and the fault is reported, and the safety emergency state of the wind turbine paddle is started, so that the paddle cannot be pitched.

[0022] In the safety emergency state of the wind turbine paddle, when the paddle needs to be pitched, the electromagnetic brake driver cannot control the variable pitch motor brake, the motor is in the state of locked rotor, at this time, the on-site maintenance personnel controls the forced manual switch K2 of the mechanical relay, the mechanical relay safety protection loop is triggered, and the variable pitch fault condition is reminded, and the on-site maintenance personnel replaces in time.

[0023] The electromagnetic brake driver control scheme of the present application adopts an electronic controller plus a mechanical relay composite scheme, the electronic controller is used as the main working device to cope with the frequent switching working state and synchronously checks the electronic controller, the fault condition of the electronic controller in the unit can be quickly and accurately identified during frequent variable pitch, the safety emergency state of the wind turbine paddle is started according to the fault condition, so that the paddle cannot be pitched, the maintenance personnel is reminded to replace in time, and the mechanical relay is used as the protection relay in the safety emergency state, as a safety protection channel, the mechanical relay safety protection loop is triggered in the case of electronic relay failure, the blade is stopped in the safe position, the toothed belt is not pulled off, and the unit is safe. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 It is a modular structure schematic diagram of the electromagnetic brake drive control system of the present application;

[0026] Figure 2 It is a modular structure schematic diagram of the DC-DC switch detection control circuit of the present application;

[0027] Figure 3Circuit diagram of the electromagnetic brake driving control system of the application;

[0028] Figure 4 Circuit diagram of the mechanical relay of the application;

[0029] Reference numerals in the figure: 10, wind blade paddle driving module; 20, electromagnetic brake driving module; 30, self-checking module; 301, relay power supply circuit; 302, voltage detection circuit; 303, execution circuit. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions and advantages of the embodiments of the application clearer, the technical solutions of the embodiments of the application will be described clearly and completely below with reference to the drawings of the embodiments of the application. Obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments of the application. Based on the described embodiments of the application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the application.

[0031] Embodiment one

[0032] Reference Figure 1 and Figure 4 For an embodiment of the application, the embodiment provides an electromagnetic brake driving control system of a wind power paddle, which comprises a wind power paddle driving module 10, an electromagnetic brake driving module 20 connected with the wind power paddle driving module 10, and a self-checking control module 30 for detecting the electromagnetic brake driving module 20. The electromagnetic brake driving module 20 comprises an electromagnetic brake driver connected in series with the wind power paddle driving module 10, and a relay connected in series with the electromagnetic brake driver. The self-checking control module 30 is connected with the relay, and comprises a DC-DC switch detection control circuit for fault self-checking and control of the electromagnetic brake driver.

[0033] In an embodiment, preferably the electromagnetic brake driver is used to cope with the working state of frequent switching of the wind power paddle driving module 10, and the electromagnetic brake driver is set as a main working device for controlling the wind power paddle driving module 10. The relay is used for forced manual control in a safety emergency state of the wind power paddle, and the relay is set as an auxiliary working device of the mechanical relay.

[0034] In an embodiment, specifically, the mechanical relay comprises a forced manual switch K2 and a grounding resistor R20, the forced manual switch K2 and the grounding resistor R20 are connected in parallel, an output end of the forced manual switch K2 is connected with an input end of the electromagnetic brake driver, and an input end of the forced manual switch K2 is connected with a power supply circuit.

[0035] The embodiment gives an electromagnetic brake driver control scheme using an electronic controller and a mechanical relay composite scheme. The electronic controller is used as a main working device to cope with the working state of frequent switching; and the mechanical relay is used as a protection relay for safety emergency, as a safety protection channel, to trigger the mechanical relay safety protection circuit in the case of electronic relay failure, to ensure that the blade stops at a safe position, to ensure that the toothed belt is not pulled off, and to ensure the safety of the unit.

[0036] Embodiment Two

[0037] Referring to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , one embodiment of the present application provides an electromagnetic brake drive control system for a wind turbine blade. The embodiment adds a self-checking module 30 for self-checking the electronic controller on the basis of the electronic controller and mechanical relay composite scheme of the embodiment.

[0038] In the second embodiment, the mechanical relay is triggered in the case of failure of the electromagnetic brake driver in the first embodiment to perform a safety protection circuit. The failure conditions include: damage to the switching triode of the electromagnetic brake driver, under-voltage of the switching power supply circuit, large fluctuation, and high temperature.

[0039] The DC-DC switch detection control circuit performs fault self-checking and control. Specifically, the DC-DC switch detection control circuit determines whether the current condition is a safety emergency state. The safety emergency state is set to trigger the mechanical relay to perform a safety protection circuit in the case of failure of the electromagnetic brake driver. The failure conditions include: damage to the switching triode of the electromagnetic brake driver, under-voltage of the switching power supply circuit, large fluctuation, and high temperature.

[0040] In the second embodiment, the DC-DC switch detection control circuit includes a relay power supply circuit, a voltage detection circuit, and an execution circuit.

[0041] The relay power supply circuit comprises a DC voltage stabilizing chip, a capacitor C1, a capacitor C2, an inductor L1 and a diode D1; the Vin end of the DC voltage stabilizing chip is connected to the positive pole of the power supply circuit, the first end of the capacitor C1 is connected to the Vin end of the DC voltage stabilizing chip, the second end of the capacitor C1 is connected to the Gn end of the DC voltage stabilizing chip and the negative pole of the power supply circuit, the first end of the capacitor C2 is connected to the Feedback end of the DC voltage stabilizing chip, the second end of the capacitor C2 is connected to the Gn end of the DC voltage stabilizing chip and grounded, the negative pole of the diode D1 is connected to the Out end of the DC voltage stabilizing chip, the positive pole of the diode D1 is connected to the Gn end of the DC voltage stabilizing chip, the input end of the inductor L1 is connected to the Out end of the DC voltage stabilizing chip, and the output end of the inductor L1 is connected to the first end of the capacitor C2 and the execution circuit;

[0042] The voltage detection circuit comprises a voltage detection chip, a resistor R1 and a resistor R2; the In end of the voltage detection chip is connected to the first end of the resistor R1, the second end of the resistor R1 is connected to the positive pole of the power supply circuit, the Gn end of the voltage detection chip is connected to the first end of the resistor R2, and the Gn end of the voltage detection chip is connected to the negative pole of the power supply circuit, and the second end of the resistor R2 is connected to the resistor R1;

[0043] The execution circuit is connected in series with the K3 relay and the K4 relay, and comprises an NMOS tube; the gate of the NMOS tube is connected to the Out end of the voltage detection chip, the source of the NMOS tube is connected to the Gn end of the voltage detection chip, and the drain of the NMOS tube is connected to the output end of the inductor L1.

[0044] In the two embodiments, the electromagnetic brake driver further comprises a paddle driving output chip and a control input chip; the positive and negative output ends of the paddle driving output chip are connected to the positive and negative input ends of the motor in the wind power paddle driving module; the Vcc end of the control input chip is connected to an external PLC control system, and the Vcc end of the control input chip is connected to the negative pole of a diode D2, and the positive pole of the diode D2 is connected to the power supply circuit.

[0045] In the two embodiments, it is particularly emphasized that the resistor R1 and the resistor R2 are voltage dividing resistors, the resistance values of the resistor R1 and the resistor R2 are respectively set to 3kΩ and 1kΩ, the internal voltage of the voltage detection circuit is set to 5V, and the fluctuation threshold of the input voltage is set to less than 2.5%. Figure 3 As shown in FIG. 5, after the relay loses power, the K3 loop and the K4 loop are disconnected at the same time, which can not only ensure the disconnection of the internal safety chain of the variable pitch and report the fault, but also lock the AC2 to prevent the blade from performing the variable pitch action. If a relay with multiple contacts is selected, different loops can be connected to realize different functions; the attraction and disconnection of the relay are controlled through the triode in the loop.

[0046] The DC-DC switch detection control circuit of the embodiment performs fault self-checking and control, is powered by a relay power supply circuit, performs real-time voltage detection by a voltage detection circuit, and performs control by an execution circuit, thereby self-checking the working state of frequent switching and synchronously self-checking an electronic controller, quickly and accurately identifying the fault condition of the electronic controller in the unit during frequent pitch changing, adjusting according to the fault condition, starting the safety emergency state of the wind turbine blade, and making the blade unable to perform pitch changing, so as to remind the operation and maintenance personnel to replace in time, thereby not only self-checking and identifying the fault state in time, but also ensuring the safety of the unit after starting the safety state in time, and further improving the stability and reliability of the blade operation at the present stage.

[0047] Embodiment three

[0048] The embodiment provides a control method of an electromagnetic brake driving control system of a wind turbine blade, which is applied to the triggering mechanical relay safety protection circuit and synchronous self-checking safety control function of the two embodiments, and the control method comprises the following steps of:

[0049] When the blade needs to perform pitch changing in the case that the electromagnetic brake driver normally works, a brake release signal is given through a pitch changing control signal received by a control input chip, the electromagnetic brake driver is controlled through K3 and K4 relays of an execution circuit, and a blade output control signal is output to the blade through a blade driving output chip, so that the blade of the wind turbine blade driving module starts to perform pitch changing. Similarly, when the blade needs to stop, a stop control signal received by the control input chip is used to give a blade stop signal and perform control, and the mechanical relay is not used.

[0050] Meanwhile, a self-checking module in the electromagnetic brake driver works synchronously, real-time voltage detection of the electromagnetic brake driver in normal working is performed through a voltage detection circuit in a DC-DC switch detection control circuit, when the voltage drops to a threshold value or the voltage fluctuation is greater than the threshold value, the voltage detection chip is changed from high-level output to low-level output, it is determined that the electromagnetic brake driver has a fault, at this time, the relays in the execution circuit are powered on through a relay power supply circuit, a blade pitch changing stop signal is given and control is performed, after the relays lose power, the K3 relay loop and the K4 relay loop are disconnected at the same time, the internal safety chain of pitch changing is disconnected, and the fault is reported, and the safety emergency state of the wind turbine blade is started, so that the blade cannot perform pitch changing.

[0051] When the blade needs to perform pitch changing in the safety emergency state of the wind turbine blade, the electromagnetic brake driver cannot control the brake of the pitch motor, and the motor is in a locked-rotor state, at this time, the on-site operation and maintenance personnel control the forced manual switch K2 of the mechanical relay, the mechanical relay safety protection circuit is triggered, and the pitch changing fault condition is reminded, and the on-site operation and maintenance personnel replace in time.

[0052] Based on the above embodiments, the electromagnetic brake driver control scheme adopts a composite scheme of an electronic controller and a mechanical relay. The electronic controller is used as a main working device to cope with frequent switching and to perform self-checking on the electronic controller synchronously. The electronic controller can quickly and accurately identify the fault condition of the electronic controller in the unit during frequent pitch changes, and can adjust according to the fault condition, i.e. start the safety emergency state of the wind turbine blade, so that the blade cannot perform pitch action, to remind the operation and maintenance personnel to replace in time. The mechanical relay is used as a protection relay in the safety emergency state, and is used as a safety protection channel. In the case of failure of the electronic relay, the mechanical relay safety protection circuit is triggered to ensure that the blade stops at a safe position, the toothed belt is not pulled off, and the unit is safe.

[0053] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0054] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of various changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An electromagnetic brake drive control system for a wind turbine blade, characterized by, The wind turbine blade driving module, the electromagnetic brake driving module connected with the wind turbine blade driving module, and the self-checking control module for detecting the electromagnetic brake driving module are provided. The self-checking control module is connected with the relay, the electromagnetic brake driving module is used to cope with the working state of frequent opening and closing of the wind turbine blade driving module, and the electromagnetic brake driving module is configured as a main working device for controlling the wind turbine blade driving module; the relay is used for forced manual control in a safety emergency state of the wind turbine blade, and the relay is configured as an auxiliary working device of the mechanical relay; the DC-DC switch detection control circuit for fault self-checking and control of the electromagnetic brake driving module is provided; the DC-DC switch detection control circuit performs fault self-checking and control, specifically, whether the current condition is a safety emergency state is judged through the DC-DC switch detection control circuit, the safety emergency state is configured to trigger the mechanical relay in the fault condition of the electromagnetic brake driving module to perform a safety protection loop; The fault condition includes damage of the switching triode of the electromagnetic brake driving module, under-voltage, large fluctuation and high temperature of the switching power supply circuit. The DC-DC switch detection control circuit includes a relay power supply circuit, a voltage detection circuit and an execution circuit; the relay power supply circuit includes a DC voltage stabilizing chip, a capacitor C1, a capacitor C2, an inductor L1 and a diode D1; the Vin end of the DC voltage stabilizing chip is connected with the positive pole of the power supply circuit, the first end of the capacitor C1 is connected with the Vin end of the DC voltage stabilizing chip, the second end of the capacitor C1 is connected with the Gn end of the DC voltage stabilizing chip and the negative pole of the power supply circuit, the first end of the capacitor C2 is connected with the Feedback end of the DC voltage stabilizing chip, the second end of the capacitor C2 is connected with the Gn end of the DC voltage stabilizing chip and grounded, the negative pole of the diode D1 is connected with the Out end of the DC voltage stabilizing chip, the positive pole of the diode D1 is connected with the Gn end of the DC voltage stabilizing chip, the input end of the inductor L1 is connected with the Out end of the DC voltage stabilizing chip, and the output end of the inductor L1 is connected with the first end of the capacitor C2 and the execution circuit; The voltage detection circuit includes a voltage detection chip, a resistor R1 and a resistor R2; the In end of the voltage detection chip is connected with the first end of the resistor R1, the second end of the resistor R1 is connected with the positive pole of the power supply circuit, the Gn end of the voltage detection chip is connected with the first end of the resistor R2, and the Gn end of the voltage detection chip is connected with the negative pole of the power supply circuit, and the second end of the resistor R2 is connected with the resistor R1; The execution circuit is connected with K3 relay and K4 relay in series, and the execution circuit includes an NMOS tube; the gate of the NMOS tube is connected with the Out end of the voltage detection chip, the source of the NMOS tube is connected with the Gn end of the voltage detection chip, and the drain of the NMOS tube is connected with the output end of the inductor L1. The electromagnetic brake driver further comprises a paddle driving output chip and a control input chip, positive and negative output ends of the paddle driving output chip are connected to positive and negative input ends of a motor in the wind power paddle driving module, a Vcc end of the control input chip is connected to an external PLC control system, and the Vcc end of the control input chip is connected to a negative electrode of a diode D2, a positive electrode of the diode D2 is connected to a power supply circuit.

2. The electromagnetic brake drive control system of a wind turbine blade according to claim 1, wherein, The mechanical relay comprises a forced manual switch K2 and a grounding resistor R20, the forced manual switch K2 and the grounding resistor R20 are connected in parallel, an output end of the forced manual switch K2 is connected to an input end of the electromagnetic brake driver, and an input end of the forced manual switch K2 is connected to the power supply circuit.

3. The electromagnetic brake drive control system of a wind turbine blade according to claim 1, wherein, The resistors R1 and R2 are voltage dividing resistors, the resistors R1 and R2 have resistance values of 3 kΩ and 1 kΩ respectively, an internal voltage of the voltage detection circuit is 5 V, and a fluctuation threshold of an input voltage is less than 2.5%.

4. The control method of claim 2, wherein the control method comprises: Comprise: When the paddle needs to be pitched under normal operation of the electromagnetic brake driver, a pitch control signal received by the control input chip gives a brake release signal, the electromagnetic brake driver is controlled by K3 and K4 relays of an execution circuit, and a paddle driving output chip outputs a control signal to the paddle, and the paddle of the wind power paddle driving module starts to pitch, and in the same way, when the paddle needs to stop, a stop control signal received by the control input chip gives a paddle stop signal and controls, and the mechanical relay is not used; Meanwhile, a self-checking control module in the electromagnetic brake driver works synchronously, a voltage detection circuit in a DC-DC switch detection control circuit detects a voltage in real time when the electromagnetic brake driver normally operates, when the voltage drops to a threshold or the voltage fluctuation is greater than the threshold, the voltage detection chip changes from high-level output to low-level output, and it is determined that the electromagnetic brake driver has a fault, at this time, the relays in the execution circuit are powered on by a relay power supply circuit, a paddle stop pitch signal is given and controlled, and after the relays lose power, K3 and K4 relay loops are disconnected at the same time, the internal safety chain of the pitch is disconnected, a fault is reported, and a safety emergency state of the wind power paddle is started, so that the paddle cannot pitch; When the paddle needs to pitch in the safety emergency state of the wind power paddle, the electromagnetic brake driver cannot control the pitch motor brake, and the motor is in a locked-rotor state, at this time, the on-site maintenance personnel control the forced manual switch K2 of the mechanical relay, the mechanical relay safety protection circuit is triggered, and the pitch fault is reminded, and the on-site maintenance personnel timely replace.

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