Power amplifier board, variable-pitch motor driving unit and variable-pitch motor driving system

Abstract

The utility model provides a power board, a variable-pitch motor driving unit and a variable-pitch motor driving system. The power board comprises a power conversion circuit, a first current sensor and a first signal connector. The first current sensor is connected with the power conversion circuit; the power conversion circuit is used for inputting three-phase alternating current and outputting direct current, or the power conversion circuit is used for inputting direct current and outputting three-phase alternating current; the first signal connector is connected with the first current sensor and the power conversion circuit. The power board can be used as a grid-side power conversion circuit in the power circuit of the variable-pitch motor and can also be used as a machine-side power conversion circuit, the power conversion circuits in the power circuit are modularly integrated in the form of the power board, and when the power demand is relatively high, a plurality of power boards can be connected in parallel, so that the power demand is relatively high. The number of the power boards is flexibly adjusted according to power levels, and various power levels can be met.

Description

Technical Field

[0001] This application relates to the field of motor drive technology, and in particular to a power board, a pitch motor drive unit and system. Background Technology

[0002] In a pitch drive system, three-phase power supplied by the grid is input to the grid-side power conversion circuit, which rectifies the three-phase power to obtain direct current (DC). The DC power is then transmitted through the bus to the turbine-side power conversion circuit, which inverts the DC power to obtain alternating current (AC), which drives the pitch motor. In related technologies, the grid-side and turbine-side power conversion circuits are mounted on the same circuit board, resulting in a relatively fixed and limited power capacity, which is insufficient to meet high-power demands. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a power board, a pitch motor drive unit and system to meet various power levels.

[0004] In a first aspect, embodiments of this application provide a power board, which includes: a power conversion circuit, a first current sensor, and a first signal connector; the first current sensor is connected to the power conversion circuit; the power conversion circuit is used to input three-phase AC power and output DC power, or the power conversion circuit is used to input DC power and output three-phase AC power; the first signal connector is connected to the first current sensor and the power conversion circuit respectively.

[0005] The power board also includes a first auxiliary power supply circuit; the first auxiliary power supply circuit has an input port and is connected to the power conversion circuit to provide auxiliary power to the power conversion circuit.

[0006] Secondly, embodiments of this application provide a pitch motor drive unit, which includes: a heat sink, a grid-side power board, and a machine-side power board; both the grid-side power board and the machine-side power board are implemented using the aforementioned power board; the grid-side power board and the machine-side power board are disposed on the heat sink; the grid-side power board is used to input three-phase AC power and output DC power; the machine-side power board is used to input DC power and output three-phase AC power.

[0007] The aforementioned grid-side power boards include multiple boards; multiple grid-side power boards are arranged in parallel.

[0008] The aforementioned machine-side power boards include multiple boards; the multiple machine-side power boards are arranged in parallel.

[0009] The aforementioned pitch motor drive unit also includes a function board; the function board includes: a first switch and a corresponding drive circuit for the first switch, a second switch and a corresponding drive circuit for the second switch, and a third switch and a corresponding drive circuit for the third switch; wherein, the first switch is a switch in the redundant braking circuit, the second switch is a switch in the voltage conversion circuit connected to the backup power supply, and the third switch is a switch in the voltage conversion circuit connected to the high-voltage holding brake circuit; the function board is mounted on the heat sink.

[0010] The aforementioned functional board also includes a second current sensor and a third current sensor; wherein the second current sensor is a current sensor connected to the backup power supply, and the third current sensor is a current sensor connected to the high-voltage brake circuit.

[0011] The aforementioned functional board also includes: a second auxiliary power supply circuit; the second auxiliary power supply circuit is connected to the control board, and is used to obtain DC power from the control board and provide power to the devices in the functional board.

[0012] The aforementioned function board also includes: a second signal connector; the second signal connector connects to the control board, the second signal connector receives control signals from the control board, and the status signals generated by the function board can be sent to the control board through the second signal connector.

[0013] The aforementioned heat sink is also equipped with a reverse protection diode; the reverse protection diode is a backup power supply reverse protection diode.

[0014] The aforementioned pitch motor drive unit also includes a capacitor board; the capacitor board is suspended between itself and the power board; the capacitor board is suspended between itself and the function board; the capacitor board is connected to the power board and the function board respectively through conductive support components; the capacitor board includes a soft-start circuit and a voltage sampling circuit; wherein, the soft-start circuit is connected to the grid-side power board; the voltage sampling circuit is connected to both the grid-side power board and the machine-side power board.

[0015] The aforementioned pitch motor drive unit also includes a power supply board; the power supply board is located on the side of the capacitor board away from the function board; the power supply board obtains electrical energy from the capacitor board and supplies power to the control board.

[0016] The aforementioned pitch motor drive unit also includes a control board; the control board is located on the side of the power board away from the capacitor board; the control board connects the power board, the function board, and the capacitor board.

[0017] Thirdly, embodiments of this application provide a pitch motor drive system, the system including the aforementioned pitch motor drive unit and a backup power supply; the pitch motor drive unit is connected to the backup power supply, and the pitch motor drive unit is used to connect to the pitch motor.

[0018] The aforementioned pitch motor drive unit includes multiple units, and the backup power supply includes multiple units; each pitch motor drive unit is connected to a corresponding backup power supply; each pitch motor drive unit is used to connect to a corresponding pitch motor.

[0019] The aforementioned power board, pitch motor drive unit, and system, wherein the power board includes: a power conversion circuit, a first current sensor, and a first signal connector; the first current sensor is connected to the power conversion circuit; the power conversion circuit is used to input three-phase AC power and output DC power, or the power conversion circuit is used to input DC power and output three-phase AC power; the first signal connector is connected to the first current sensor and the power conversion circuit respectively.

[0020] The aforementioned power board can be used as a grid-side power conversion circuit in the power circuit of a pitch motor, or as a machine-side power conversion circuit. The power conversion circuit in the power circuit is modularly integrated in the form of a power board. When the power demand is high, multiple power boards can be set up in parallel. The number of power boards can be flexibly adjusted according to the power level to meet various power levels.

[0021] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this application or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a power circuit for a pitch motor in related technologies;

[0024] Figure 2 A schematic diagram of a power board provided in an embodiment of this application;

[0025] Figure 3 A schematic diagram of another power board provided in an embodiment of this application;

[0026] Figure 4 A schematic diagram of a pitch motor drive unit provided in an embodiment of this application;

[0027] Figure 5 A schematic diagram of another pitch motor drive unit provided in an embodiment of this application;

[0028] Figure 6 A schematic diagram of a functional board provided in an embodiment of this application;

[0029] Figure 7 A schematic diagram of another pitch motor drive unit provided in an embodiment of this application;

[0030] Figure 8 A schematic diagram of the circuit topology of a pitch motor drive unit provided in an embodiment of this application;

[0031] Figure 9 A schematic diagram of another pitch motor drive unit provided in an embodiment of this application;

[0032] Figure 10 A schematic diagram of the circuit topology of another pitch motor drive unit provided in an embodiment of this application;

[0033] Figure 11 A schematic diagram of a capacitor plate provided in an embodiment of this application;

[0034] Figure 12 A schematic diagram of another pitch motor drive unit provided in an embodiment of this application;

[0035] Figure 13 A schematic diagram of a pitch motor drive system provided in an embodiment of this application;

[0036] Figure 14 This is a schematic diagram of another pitch motor drive system provided in an embodiment of this application. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] The pitch system is a key control component of wind turbine transmission equipment. Its main function is to use a frequency converter to control the operation of the pitch motor, which in turn drives the gears and blades to rotate, thereby controlling the vertical wind direction of the blades. This ensures that the blades are in a relatively safe working state, allowing the wind turbine to operate and generate electricity efficiently without breaking apart due to excessive wind volume or excessive blade speed, thus protecting the entire wind turbine for long-term safe and efficient operation.

[0039] The pitch system consists of a pitch control cabinet and a pitch motor. The pitch control cabinet consists of a pitch driver, a backup power supply, and electrical components, including reactors, heaters, sensors, fuses, switches, and an external switching power supply.

[0040] The pitch drive, pitch motor, and backup power supply are the three core components of a pitch system, with the main functions being implemented by the pitch drive. The pitch drive is a highly integrated component; the power devices can be cooled by the pitch drive, and the pitch drive can directly and independently drive the motor.

[0041] Figure 1 The diagram shows a power circuit for a pitch motor. Three-phase power supplied by the grid is input to a grid-side power conversion circuit, which rectifies the three-phase power to obtain direct current (DC). This DC power is then transmitted through the bus to the turbine-side power conversion circuit, where it is inverted to obtain alternating current (AC). This AC power drives the pitch motor. Additionally, when the motor brakes, the bus voltage rises, and the grid-side power conversion circuit feeds the energy from the bus voltage back to the grid.

[0042] The aforementioned grid-side power conversion circuit and machine-side power conversion circuit may include IGBT (Insulated-Gate Bipolar Transistor) devices, or MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) devices.

[0043] The grid-side power conversion circuit and the engine-side power conversion circuit are laid on the same circuit board, which can handle a relatively fixed and small power level, making it difficult to meet high power requirements. Therefore, the power board, pitch motor drive unit, and pitch motor drive system provided in this application embodiment can be applied to pitch systems.

[0044] To facilitate understanding of this embodiment, a power board disclosed in this application will first be described in detail, such as... Figure 2 As shown, the power board includes: a power conversion circuit 20, a first current sensor 21, and a first signal connector 22; the first current sensor is connected to the power conversion circuit.

[0045] The power conversion circuit is used to input three-phase AC power and output DC power, or it can be used to input DC power and output three-phase AC power. For example, when the power board is connected to the power grid, the three-phase AC power from the grid is input to the power conversion circuit, which rectifies the input three-phase AC power and outputs DC power.

[0046] When the power board is connected to the bus, the DC power supplied by the bus is input to the power conversion circuit. The power conversion circuit inverts the input DC power and outputs AC power. This AC power is then output to the power grid or pitch motor through the three-phase power transmission pin.

[0047] The aforementioned current sensor is used to acquire current signals; specifically, it can measure the current signal in a bridge arm circuit composed of power devices in a power conversion circuit. This current signal can be either the AC current signal output from the power conversion circuit or the AC current signal input to the power conversion circuit.

[0048] The aforementioned first signal connector is connected to both the first current sensor and the power conversion circuit. The first signal connector is used to forward control signals sent by the control board to the power conversion circuit, thereby controlling the operation of the power conversion circuit. The first signal connector can also forward status signals generated by the power conversion circuit and the current sensor to the control board. Specifically, this first signal connector can be a communication interface.

[0049] The control signal can specifically be a PWM (Pulse Width Modulation) waveform signal. The control signal is sent to the drive circuit in the power conversion circuit, and the drive circuit controls the power devices such as IGBTs or MOSFETs in the power conversion circuit to turn on and off according to the control signal.

[0050] The aforementioned power conversion circuit can generate status signals such as temperature signals and drive fault signals of the power devices. The temperature signal can be generated by a temperature sensor installed on the power conversion circuit. The power conversion circuit sends the generated status signals to the first signal connector, and the current signal generated by the current sensor is also transmitted to the first signal connector. The first signal connector forwards these status signals to the control board.

[0051] The aforementioned power board includes: a power conversion circuit, a first current sensor, and a first signal connector; the first current sensor is connected to the power conversion circuit; the power conversion circuit is used to input three-phase AC power and output DC power, or the power conversion circuit is used to input DC power and output three-phase AC power; the first signal connector is connected to the first current sensor and the power conversion circuit respectively.

[0052] The aforementioned power board can be used as a grid-side power conversion circuit in the power circuit of a pitch motor, or as a machine-side power conversion circuit. The power conversion circuit in the power circuit is modularly integrated in the form of a power board. When the power demand is high, multiple power boards can be set up in parallel. The number of power boards can be flexibly adjusted according to the power level to meet various power levels.

[0053] Figure 3 The diagram shows another type of power board, which also includes a first auxiliary power supply circuit 30. This first auxiliary power supply circuit has an input port and is connected to the power conversion circuit, providing auxiliary power to the power conversion circuit. This auxiliary power can be a 24V DC power supply.

[0054] The input port of the first auxiliary power supply circuit can be connected to the control board to obtain auxiliary power from the control board; the input port can also be connected to the first signal connector to obtain power from the first signal connector.

[0055] The power board can also be equipped with three-phase power transmission pins, including U pin, V pin and W pin. Each pin outputs one phase of the three-phase AC power. Each pin is equipped with a current sensor to collect the current of the corresponding phase.

[0056] Specifically, the first auxiliary power supply circuit can supply power to the drive circuit of the switching transistor in the power conversion circuit. The first auxiliary power supply circuit usually does not supply power to the current sensor or the first signal connector.

[0057] This embodiment also provides a pitch motor drive unit, such as Figure 4 As shown, the pitch motor drive unit includes: a radiator 40, a grid-side power board 41, and a machine-side power board 42; both the grid-side power board and the machine-side power board are implemented using the aforementioned power boards; the grid-side power board and the machine-side power board are mounted on the radiator.

[0058] The grid-side power board receives three-phase AC power and outputs DC power. The three-phase AC power input to the grid-side power board can be provided by the power grid, and the DC output is located on the DC bus. The machine-side power board receives DC power and outputs three-phase AC power. The DC power input to the machine-side power board is provided by the DC bus, and the three-phase AC output powers the pitch motor. A radiator provides heat dissipation for both the grid-side and machine-side power boards. The grid-side and machine-side power boards are tightly attached to and fixed to the radiator.

[0059] When the pitch motor brakes, the bus voltage rises, and the grid-side power board can feed the electrical energy from the bus voltage back to the grid, significantly reducing the energy loss of the braking resistor, reducing the heating of the braking resistor, lowering the temperature of the hub, and improving the reliability of the pitch drive unit.

[0060] The aforementioned pitch motor drive unit includes: a radiator, a grid-side power board, and a machine-side power board; both the grid-side and machine-side power boards are implemented using the aforementioned power boards; the grid-side and machine-side power boards are mounted on the radiator; the grid-side power board is used for inputting three-phase AC power and outputting DC power; the machine-side power board is used for inputting DC power and outputting three-phase AC power. 。

[0061] The aforementioned grid-side power conversion circuit and machine-side power conversion circuit can be implemented using power boards. The power conversion circuit is modularly integrated in the form of power boards. When the power demand is high, multiple power boards can be connected in parallel. The number of power boards can be flexibly adjusted according to the power level to meet various power levels.

[0062] like Figure 5In the above-mentioned pitch motor drive unit, there is also a function board 50; the function board includes: a first switch 501 and a corresponding drive circuit for the first switch, a second switch 502 and a corresponding drive circuit for the second switch, and a third switch 503 and a corresponding drive circuit for the third switch.

[0063] The first switch is used in the redundant braking circuit, the second switch is used in the voltage conversion circuit connected to the backup power supply, and the third switch is used in the voltage conversion circuit connected to the high-voltage holding brake circuit. The function board is mounted on the heat sink. The function board is in close contact with the heat sink and fixed to it.

[0064] This functional board integrates the switching transistors in the redundant braking circuit, the voltage conversion circuit connected to the backup power supply, and the voltage conversion circuit connected to the high-voltage brake circuit. The board is mounted on a heatsink to dissipate heat from these switching transistors. The voltage conversion circuits connected to the backup power supply and the high-voltage brake circuit can specifically be BUCK circuits or other types of voltage conversion circuits. The backup power supply can be implemented using a supercapacitor module.

[0065] When the pitch motor brakes, it mainly relies on the grid-side power board to feed the electrical energy from the DC bus back to the grid. Considering safety redundancy, the aforementioned redundant braking circuit is also set up. When the grid-side power board fails, the redundant braking circuit releases electrical energy to improve the safety of the drive unit.

[0066] like Figure 6 The aforementioned functional board also includes: a second current sensor 60 and a third current sensor 61; the second current sensor is a current sensor connected to the backup power supply, and the third current sensor is a current sensor connected to the high-voltage holding brake circuit. 。

[0067] The current sensor connected to the backup power supply is used to collect the current when the backup power supply is charging or discharging; the current sensor connected to the high-voltage brake circuit is used to collect the current when the high-voltage brake circuit is running.

[0068] The aforementioned functional board also includes a second auxiliary power supply circuit 62. This second auxiliary power supply circuit is connected to the control board and is used to obtain DC power from the control board and provide power to the devices in the functional board. The DC power can be a 24V DC power supply, and specifically, the second auxiliary power supply circuit can supply power to the drive circuit of the switching transistor in the functional board.

[0069] The aforementioned function board also includes: a second signal connector 63; the second signal connector is connected to the control board, and the second signal connector receives control signals from the control board, and the status signals generated by the function board can be sent to the control board through the second signal connector.

[0070] The aforementioned second signal connector is used to forward control signals from the control board to the drive circuits corresponding to the switching transistors in the function board, thereby controlling the switching transistors in the function board to turn on or off. The second signal connector also forwards status signals generated by the function board to the control board.

[0071] The second signal connector can specifically be a communication interface. The aforementioned control signal can specifically be a PWM wave signal.

[0072] The aforementioned functional board can generate status signals such as temperature signals and drive fault signals for the switching transistor; the temperature signal can be generated by a temperature sensor installed on the switching transistor; the current signal generated by the current sensor is also transmitted to the second signal connector; the second signal connector forwards these status signals to the control board.

[0073] like Figure 7 The aforementioned heat sink also includes a reverse protection diode 70, which serves as a backup power supply. This reverse protection diode is fixed to the heat sink, which provides heat dissipation for it.

[0074] Figure 8 A schematic diagram of a circuit topology for a pitch motor drive unit is shown. This topology includes a grid-side power board and a machine-side power board. The input terminals of the grid-side power board include contactors and an EMI (Electromagnetic Interference) filter; the EMI filter is connected to the grid-side power board, and the contactor can specifically be an AC contactor. A bus capacitor is provided between the grid-side power board and the machine-side power board. The machine-side power board is connected to the pitch motor M.

[0075] This circuit topology uses the body diode of the IGBT for rectification. It cannot be turned off or soft-started, so an AC contactor control switch is required at the input. In addition, the circuit also includes a soft-start circuit, which disconnects after the soft start is completed.

[0076] In another implementation, the aforementioned grid-side power boards include multiple boards connected in parallel; these boards are distributed across different areas of the heat sink. By connecting multiple grid-side power boards in parallel, the processing power of the grid-side power conversion circuit can be increased; each grid-side power board is laid close to the heat sink to ensure timely heat dissipation for each board.

[0077] The aforementioned machine-side power boards include multiple boards; these multiple machine-side power boards are arranged in parallel; and they are distributed in different areas of the heat sink. By arranging multiple machine-side power boards in parallel, the processing power of the machine-side power conversion circuit can be increased; each machine-side power board is laid close to the heat sink to ensure timely heat dissipation for each board.

[0078] It should be noted that the number of grid-side power boards can be flexibly adjusted according to power requirements, and the number of machine-side power boards can also be flexibly adjusted according to power requirements. The number of grid-side power boards and machine-side power boards do not affect each other.

[0079] Figure 9 In the example, considering that the machine-side current is much greater than the grid-side current, there are two grid-side power boards and three machine-side power boards. The five power boards are distributed on the heat sink, which also contains functional boards and backup power supply anti-reverse diodes.

[0080] Figure 10 A circuit topology diagram of another pitch motor drive unit is shown; two grid-side power boards are connected to the EMI filter board respectively; the two grid-side power boards are also connected to the bus capacitor respectively; the three engine-side power boards are connected in parallel to provide power to the pitch motor M.

[0081] When operating at higher power, multiple grid-side power boards or multiple generator-side power boards can be connected in parallel, increasing the system's power rating. Furthermore, each power board connected in parallel has its own independent current sampling and control, improving the reliability of the drive unit.

[0082] In one implementation, the aforementioned pitch motor drive unit further includes a capacitor board; the capacitor board is suspended from the power board; the capacitor board is suspended from the function board; and the capacitor board is connected to the power board and the function board respectively via conductive support members.

[0083] The capacitor board includes a soft-start circuit and a voltage sampling circuit; the soft-start circuit is connected to the grid-side power board and is used to control the soft start of the grid-side power board; the voltage sampling circuit is connected to both the grid-side power board and the machine-side power board and is used to sample the voltage parameters of the grid-side power board and the machine-side power board.

[0084] The aforementioned grid-side power board, machine-side power board, and function board are all directly laid and fixed on the heat sink. The aforementioned capacitor board is set on the upper layer of the grid-side power board, machine-side power board, and function board. The aforementioned conductive support component is used for conduction and support. Specifically, it can be a conductive nut or other components with conductive support function.

[0085] From the above Figure 8 and Figure 10 It is understood that the soft-start circuit is connected to the input terminal of the grid-side power board to control the soft start of the grid-side power board. The aforementioned voltage sampling circuit may include one or more, and may be connected in the grid-side power board and the machine-side power board, at the location where voltage monitoring is required, or in other locations in the pitch motor drive unit. The voltage sampling circuit generates a voltage signal, which can be sent to the control board.

[0086] like Figure 11The capacitor plate includes a soft-start circuit 110 and a voltage sampling circuit 111. It also includes capacitor components and magnetic components 112. The capacitor components include a bus capacitor 113, an electrolytic capacitor 114, and a film capacitor 115, etc.

[0087] In addition, the capacitor board also includes a third auxiliary power supply circuit 116, which is used to supply power to the circuits, capacitors and other components in the capacitor board; the capacitor board also includes a third signal connector 117, which is used to receive the control signal corresponding to the capacitor board and send the status signal generated by the capacitor board to the control board.

[0088] Furthermore, the aforementioned pitch motor drive unit also includes a power supply board; this power supply board is located on the side of the capacitor board facing away from the functional board; the power supply board obtains electrical energy from the capacitor board and supplies power to the control board. This power supply board can supply low-voltage power, such as 5V DC, to the control board.

[0089] The aforementioned pitch motor drive unit also includes a control board; the control board is located on the side of the power board away from the capacitor board; the control board connects the power board, the function board, and the capacitor board;

[0090] The control board can be connected to the first auxiliary power supply circuit in the power board, the second auxiliary power supply circuit in the function board, and the third auxiliary power supply circuit in the capacitor board to supply power to the power board, function board, and capacitor board.

[0091] The control board can also send control signals to the grid-side power board and the machine-side power board, and receive status signals sent by the grid-side power board and the machine-side power board.

[0092] See Figure 12 The pitch motor drive unit comprises multiple circuit boards. The bottom layer is a heat sink, with the grid-side power board, machine-side power board, and function board forming the first layer, directly mounted and fixed to the heat sink. The second layer is a capacitor board, which is connected to the power board and function board via conductive studs. The capacitor board sends voltage signals and soft-start signals to the control board. The third layer is a power supply board, which draws power from the capacitor board and supplies low-voltage power to the control board. The fourth layer is the control board, which sends PWM control signals to the grid-side power board and machine-side power board, and receives current signals, temperature signals, fault signals, etc., from the grid-side power board and machine-side power board.

[0093] This embodiment also provides a pitch motor drive system, see [link]. Figure 13 The system includes a pitch motor drive unit 130 and a backup power supply 131; the pitch motor drive unit is connected to the backup power supply and is used to connect to the pitch motor.

[0094] The backup power supply can be implemented using a supercapacitor module. This backup power supply can be connected to the DC bus via a voltage conversion circuit, such as a BUCK circuit, to charge or discharge the backup power supply.

[0095] Furthermore, the aforementioned pitch motor drive unit includes multiple units, and the backup power supply includes multiple units; each pitch motor drive unit is connected to a corresponding backup power supply; each pitch motor drive unit is used to connect to a corresponding pitch motor.

[0096] Figure 14 In the example, when there are three blades, each blade corresponds to a pitch motor, namely shaft one motor, shaft two motor, and shaft three motor. Each pitch motor is connected to a corresponding pitch motor drive unit, namely shaft one motor drive unit, shaft two motor drive unit, and shaft three motor drive unit. Each pitch motor drive unit is connected to a corresponding backup power supply, namely shaft one backup power supply, shaft two backup power supply, and shaft three backup power supply.

[0097] The pitch motor drive system is housed within the cabinet. The system also includes an ARM (Advanced RISC Machines, RISC microprocessor) control board, which is connected to each pitch motor via a communication bus. The ARM control board also has low-voltage terminals such as data input (DI), data output (DO), and relays.

[0098] Three-phase power is input into the cabinet, processed by high-voltage electrical components such as contactors, reactors, surge protectors, and disconnect switches, and then input to the EMI filter board, which in turn supplies power to the grid-side power board.

[0099] Furthermore, in the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0100] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0101] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0102] Finally, it should be noted that the above embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A power board, characterized in that, The power board includes: a power conversion circuit, a first current sensor, and a first signal connector; The first current sensor is connected to the power conversion circuit; The power conversion circuit is used to input three-phase AC power and output DC power, or the power conversion circuit is used to input DC power and output three-phase AC power. The first signal connector is connected to the first current sensor and the power conversion circuit, respectively.

2. The power board according to claim 1, characterized in that, The power board also includes a first auxiliary power supply circuit; The first auxiliary power supply circuit has an input port and is connected to the power conversion circuit to provide auxiliary power to the power conversion circuit.

3. A pitch motor drive unit, characterized in that, The pitch motor drive unit includes: a heat sink, a grid-side power board, and a machine-side power board; both the grid-side power board and the machine-side power board are implemented using the power board described in claim 1 or 2. The grid-side power board and the machine-side power board are mounted on the heat sink; The grid-side power board is used to input three-phase AC power and output DC power; the machine-side power board is used to input the DC power and output three-phase AC power.

4. The pitch motor drive unit according to claim 3, characterized in that, The grid-side power board includes multiple boards; the multiple grid-side power boards are arranged in parallel.

5. The pitch motor drive unit according to claim 3, characterized in that, The machine-side power board includes multiple such boards; the multiple machine-side power boards are arranged in parallel.

6. The pitch motor drive unit according to claim 3, characterized in that, The pitch motor drive unit also includes a function board; The functional board includes: a first switching transistor and a corresponding driving circuit for the first switching transistor, a second switching transistor and a corresponding driving circuit for the second switching transistor, and a third switching transistor and a corresponding driving circuit for the third switching transistor. The first switch is a switch in the redundant braking circuit, the second switch is a switch in the voltage conversion circuit connected to the backup power supply, and the third switch is a switch in the voltage conversion circuit connected to the high-voltage holding brake circuit. The functional board is mounted on the heat sink.

7. The pitch motor drive unit according to claim 6, characterized in that, The functional board also includes: a second current sensor and a third current sensor; The second current sensor is a current sensor connected to the backup power supply, and the third current sensor is a current sensor connected to the high-voltage brake circuit.

8. The pitch motor drive unit according to claim 6, characterized in that, The functional board also includes: a second auxiliary power supply circuit; The second auxiliary power supply circuit is connected to the control board. The second auxiliary power supply circuit is used to obtain DC power from the control board and provide power to the devices in the functional board.

9. The pitch motor drive unit according to claim 6, characterized in that, The functional board also includes: a second signal connector; The second signal connector is connected to the control board. The second signal connector receives control signals from the control board, and the status signals generated by the function board can be sent to the control board through the second signal connector.

10. The pitch motor drive unit according to claim 6, characterized in that, The heat sink is also equipped with a reverse protection diode; the reverse protection diode is a backup power supply reverse protection diode.

11. The pitch motor drive unit according to claim 3, characterized in that, The pitch motor drive unit further includes a capacitor board; the capacitor board is suspended from the power board; the capacitor board is suspended from the function board; the capacitor board is connected to the power board and the function board respectively through conductive support members; The capacitor board includes a soft-start circuit and a voltage sampling circuit; The soft-start circuit is connected to the grid-side power board. The voltage sampling circuit is connected to both the grid-side power board and the machine-side power board.

12. The pitch motor drive unit according to claim 11, characterized in that, The pitch motor drive unit also includes a power supply board; the power supply board is located on the side of the capacitor board away from the functional board. The power board obtains electrical energy from the capacitor board and supplies power to the control board.

13. The pitch motor drive unit according to claim 12, characterized in that, The pitch motor drive unit also includes a control board; the control board is located on the side of the power board opposite to the capacitor board. The control board is connected to the power board, the function board, and the capacitor board.

14. A pitch motor drive system, characterized in that, The system includes the pitch motor drive unit as described in any one of claims 3-13, and a backup power supply; The pitch motor drive unit is connected to the backup power supply, and the pitch motor drive unit is used to connect to the pitch motor.

15. The pitch motor drive system according to claim 14, characterized in that, The pitch motor drive unit includes multiple units, and the backup power supply includes multiple units; Each of the pitch motor drive units is connected to the corresponding backup power supply; each of the pitch motor drive units is used to connect to the corresponding pitch motor.

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