A high-voltage DC inverter fan control circuit

Abstract

This utility model discloses a high-voltage DC inverter fan control circuit, including a main control drive circuit, a power supply circuit, a bus voltage detection circuit, an FG signal feedback circuit, and a VSP speed regulation circuit. The main control drive circuit includes a chip IC1; the power supply circuit includes resistors R6 and R7 and diode ZD1; the bus voltage detection circuit includes resistors R4, R8, and R10; the FG signal feedback circuit includes a transistor Q1; and the VSP speed regulation circuit includes resistor R11. This utility model discloses a high-voltage DC inverter fan control circuit aimed at solving the problems of high energy consumption, high noise, low control accuracy, low integration, and slow speed regulation response in existing high-voltage DC inverter fan control circuits.

Description

Technical Field

[0001] This utility model belongs to the field of wind turbine control technology, specifically relating to a high-voltage DC inverter wind turbine control circuit. Background Technology

[0002] With the improvement of living standards, high-voltage DC inverter fan control devices are being used more and more widely in air conditioner indoor and outdoor units and air purifiers. Traditional high-voltage fan control methods often suffer from problems such as high energy consumption, high noise, and low control accuracy. Therefore, developing a high-efficiency, low-noise high-voltage DC inverter fan control circuit is of great significance for improving the performance of air conditioner indoor and outdoor units and air purifiers. Utility Model Content

[0003] The main purpose of this utility model is to provide a high-voltage DC inverter fan control circuit, which aims to solve the problems of high energy consumption, high noise, low control accuracy, low integration and slow speed regulation response of existing high-voltage DC inverter fan control circuits.

[0004] To achieve the above objectives, this utility model provides a high-voltage DC inverter fan control circuit, including a main control drive circuit, a power supply circuit, a bus voltage detection circuit, an FG signal feedback circuit, and a VSP speed regulation circuit, wherein:

[0005] The main control drive circuit includes a chip IC1. The U terminal (pin 31) of the chip IC1 is grounded through capacitor C27 and is also electrically connected to the U-phase winding of the fan. The V terminal (pin 34) of the chip IC1 is grounded through capacitor C28 and is also electrically connected to the V-phase winding of the fan. The W terminal (pin 37) of the chip IC1 is grounded through capacitor C29 and is also electrically connected to the W-phase winding of the fan (for driving the fan).

[0006] The power supply circuit includes resistors R6 and R7 and diode ZD1. One end of resistor R6 is connected to the power input terminal (VCC), and the other end of resistor R6 is connected to the power output terminal (VCC_15V, connected to pin 1 of chip IC1) through resistor R7. The common terminal of resistors R6 and R7 is grounded through diode ZD1. The end of resistor R7 away from resistor R6 is grounded through capacitor C6, and capacitor C7 is connected in parallel across the two ends of capacitor C6.

[0007] The bus voltage detection circuit includes resistors R4, R8, and R10. One end of resistor R4 is connected to the bus voltage (VDC_310V), and the other end of resistor R4 is grounded through resistors R8 and R10 in sequence. The common terminal of resistors R8 and R10 is electrically connected to pin 21 of the chip IC1.

[0008] The FG signal feedback circuit includes a transistor Q1. The base of the transistor Q1 is electrically connected to pin 7 of the chip IC1 through resistors R14 and R5 in sequence, and the common terminal of resistors R14 and R5 is electrically connected to pin 24 of the chip IC1. The collector of the transistor Q1 outputs an FG signal through resistor R12 (thereby providing feedback).

[0009] The VSP speed control circuit includes a resistor R11, one end of which is connected to the VSP signal input terminal (VSP_IN) and the other end of which is electrically connected to pin 6 of the chip IC1.

[0010] As a further preferred embodiment of the above technical solution, a capacitor C10 is connected in parallel across the two ends of the resistor R10.

[0011] As a further preferred embodiment of the above technical solution, the collector of the transistor Q1 is also grounded in sequence through resistor R13 and capacitor C16.

[0012] As a further preferred embodiment of the above technical solution, the other end of the resistor R11 is also grounded through the capacitor C12.

[0013] As a further preferred technical solution to the above technical solution, it also includes an EMC countermeasure circuit, which includes a Y capacitor C17, one end of the Y capacitor C17 is grounded through a resistor R15 and the other end of the Y capacitor C17 is connected to the neutral point of the fan. Attached Figure Description

[0014] Figure 1 This is the main control drive circuit diagram of this utility model.

[0015] Figure 2 This is the power supply circuit diagram of this utility model.

[0016] Figure 3 This is a circuit diagram for bus voltage detection of this utility model.

[0017] Figure 4 This is the FG signal feedback circuit diagram of this utility model.

[0018] Figure 5 This is the VSP speed control circuit diagram of this utility model.

[0019] Figure 6 This is the circuit diagram of the EMC countermeasures of this utility model. Detailed Implementation

[0020] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0021] This utility model discloses a high-voltage DC inverter fan control circuit. The specific embodiments of the utility model are further described below with reference to preferred embodiments.

[0022] In the embodiments of this utility model, those skilled in the art will note that the fans and the like involved in this utility model can be considered as prior art.

[0023] Preferred embodiment.

[0024] like Figure 1-6 As shown, this utility model discloses a high-voltage DC inverter fan control circuit, including a main control drive circuit, a power supply circuit, a bus voltage detection circuit, an FG signal feedback circuit, and a VSP speed regulation circuit, wherein:

[0025] The main control drive circuit includes a chip IC1. The U terminal (pin 31) of the chip IC1 is grounded through capacitor C27 and is also electrically connected to the U-phase winding of the fan. The V terminal (pin 34) of the chip IC1 is grounded through capacitor C28 and is also electrically connected to the V-phase winding of the fan. The W terminal (pin 37) of the chip IC1 is grounded through capacitor C29 and is also electrically connected to the W-phase winding of the fan (for driving the fan).

[0026] The power supply circuit includes resistors R6 and R7 and diode ZD1. One end of resistor R6 is connected to the power input terminal (VCC), and the other end of resistor R6 is connected to the power output terminal (VCC_15V, connected to pin 1 of chip IC1) through resistor R7. The common terminal of resistors R6 and R7 is grounded through diode ZD1. The end of resistor R7 away from resistor R6 is grounded through capacitor C6, and capacitor C7 is connected in parallel across capacitor C6 (TVS diode ZD1 (SMA18CA) suppresses high-voltage transient pulses, and R7 is used for TVS quiescent current discharge or voltage division. C6 and C7 form a high-low frequency combined filter to filter out high- and low-frequency noise from the power supply).

[0027] The bus voltage detection circuit includes resistors R4, R8, and R10. One end of resistor R4 is connected to the bus voltage (VDC_310V), and the other end of resistor R4 is grounded through resistors R8 and R10 in sequence. The common terminal of resistors R8 and R10 is electrically connected to pin 21 of chip IC1 (through the three resistors R4, R8, and R10 connected in series, chip IC1 reads the voltage value across R10 and calculates the bus voltage value according to the voltage division ratio).

[0028] The FG signal feedback circuit includes a transistor Q1. The base of transistor Q1 is electrically connected to pin 7 of chip IC1 via resistors R14 and R5, and the common terminal of resistors R14 and R5 is electrically connected to pin 24 of chip IC1. The collector of transistor Q1 outputs an FG signal via resistor R12 (using a pull-up resistor; C16 is used to suppress FG signal noise; powered by pin VDD5 of chip IC1). The FG pulse output supports 8 / 10 pole motors, displaying 4 or 12 FG signals within one mechanical cycle.

[0029] The VSP speed control circuit includes a resistor R11. One end of the resistor R11 is connected to the VSP signal input terminal (VSP_IN), and the other end of the resistor R11 is electrically connected to pin 6 of the chip IC1 (the input voltage is current-limited by R11 and then connected to the VSP pin of the chip IC1). The motor speed is adjusted according to the input voltage command. In addition, it can be set to PWM speed control mode according to different customer requirements.

[0030] Specifically, a capacitor C10 is connected in parallel across the two ends of the resistor R10.

[0031] More specifically, the collector of the transistor Q1 is grounded in sequence through resistor R13 and capacitor C16.

[0032] Furthermore, the other end of the resistor R11 is grounded through capacitor C12.

[0033] Furthermore, it also includes an EMC countermeasure circuit, which includes a Y capacitor C17. One end of the Y capacitor C17 is grounded through a resistor R15, and the other end of the Y capacitor C17 is connected to the neutral point of the fan (connecting the Y capacitor C17 to the neutral point of the fan is used to suppress high-frequency noise, improve EMC performance, and provide a discharge path for common-mode interference, thereby meeting EMI and EMS standards).

[0034] For the main control drive circuit, the three-phase full-bridge inverter circuit is designed using SSOPA54-38 package. This not only greatly saves PCB board space and effectively improves circuit integration, making the controller smaller and easier to install and maintain, but also reduces the overall space of the heat dissipation system, making the DC inverter fan control device more stable and adaptable. The VDC voltage of chip IC1 is 310V, which is used as the bus voltage of the motor controller to drive the motor.

[0035] Furthermore, resistors R21 and R20 of chip IC1 respectively collect the currents IV / IU of phase V and phase U, employing a two-resistor sampling method to acquire the three-phase current. This two-resistor sampling method reduces software implementation complexity compared to single-resistor sampling and lowers costs compared to three-resistor sampling. Kirchhoff's principle is used to calculate the current value of the other phase. After PI regulation, the motor operation is stabilized, achieving high-efficiency energy utilization and energy saving in the high-voltage DC fan, thus avoiding energy waste. Simultaneously, it significantly reduces the temperature rise of the fan and control device, enabling long-term stable operation of the fan.

[0036] The working process of this utility model is as follows:

[0037] 1. Start the power supply circuit to provide stable 15V and 310V voltages;

[0038] 2. Chip IC1 receives external speed control commands through the VSP speed control circuit (or PWM mode) and generates corresponding speed control signals;

[0039] 3. The main control drive circuit drives the three phases UVW of the motor according to the control signal to realize the motor (i.e., fan) start-up and speed regulation;

[0040] 4. The FG signal feedback circuit outputs the motor speed signal and feeds the speed signal back to the host computer, which can monitor the motor speed in real time.

[0041] 5. The bus voltage detection circuit detects the bus voltage and is used for vector control calculations and overvoltage and undervoltage protection of the motor controller;

[0042] When abnormalities such as stall, overheating, overcurrent, overvoltage, or undervoltage occur, the protection mechanism is triggered to cut off the power supply to protect the motor and circuit.

[0043] It is worth mentioning that the technical features such as the fan involved in this utility model patent application should be regarded as prior art. The specific structure, working principle, and possible control methods and spatial arrangement of these technical features can be conventionally selected in the field and should not be regarded as the inventive point of this utility model patent. This utility model patent will not elaborate further.

[0044] For those skilled in the art, modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-voltage DC inverter fan control circuit, characterized in that, It includes the main control drive circuit, power supply circuit, bus voltage detection circuit, FG signal feedback circuit, and VSP speed control circuit, among which: The main control drive circuit includes a chip IC1. The U terminal of the chip IC1 is grounded through a capacitor C27 and is also electrically connected to the U-phase winding of the fan. The V terminal of the chip IC1 is grounded through a capacitor C28 and is also electrically connected to the V-phase winding of the fan. The W terminal of the chip IC1 is grounded through a capacitor C29 and is also electrically connected to the W-phase winding of the fan. The power supply circuit includes resistor R6, resistor R7 and diode ZD1. One end of resistor R6 is connected to the power input terminal and the other end of resistor R6 is connected to the power output terminal through resistor R7. The common terminal of resistor R6 and resistor R7 is grounded through diode ZD1. The end of resistor R7 away from resistor R6 is grounded through capacitor C6 and capacitor C7 is connected in parallel across the two ends of capacitor C6. The bus voltage detection circuit includes resistors R4, R8, and R10. One end of resistor R4 is connected to the bus voltage, and the other end of resistor R4 is grounded through resistors R8 and R10 in sequence. The common terminal of resistors R8 and R10 is electrically connected to pin 21 of chip IC1. The FG signal feedback circuit includes a transistor Q1. The base of the transistor Q1 is electrically connected to pin 7 of the chip IC1 through resistors R14 and R5 in sequence, and the common terminal of resistors R14 and R5 is electrically connected to pin 24 of the chip IC1. The collector of the transistor Q1 outputs the FG signal through resistor R12. The VSP speed control circuit includes a resistor R11, one end of which is connected to the VSP signal input terminal and the other end of which is electrically connected to pin 6 of the chip IC1.

2. The high-voltage DC inverter fan control circuit according to claim 1, characterized in that, A capacitor C10 is connected in parallel across the two ends of the resistor R10.

3. The high-voltage DC inverter fan control circuit according to claim 1, characterized in that, The collector of the transistor Q1 is also grounded via resistor R13 and capacitor C16 in sequence.

4. The high-voltage DC inverter fan control circuit according to claim 1, characterized in that, The other end of the resistor R11 is also grounded through the capacitor C12.

5. The high-voltage DC inverter fan control circuit according to claim 1, characterized in that, It also includes an EMC countermeasures circuit, which includes a Y capacitor C17, one end of which is grounded through a resistor R15 and the other end of which is connected to the neutral point of the fan.

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