Single-phase power supply to three-phase alternating current rotating speed controllable fan driving module

Abstract

The utility model discloses a single-phase power supply to three-phase alternating current fan driving module with controllable rotating speed, which comprises a three-phase PWM (Pulse Width Modulation) control assembly, and the three-phase PWM control assembly comprises a U6, an IGBT (Insulated Gate Bipolar Translator), a three-phase permanent magnet motor, an NTC (Negative Temperature Coefficient) resistor, a relay RT1, an amplifying circuit and a resistor RS1. The third to eighth pins of the U6 are electrically connected with an IGBT tube through a line, the IGBT tube is electrically connected with a three-phase permanent magnet motor through a line, the seventeenth pin of the U6 is electrically connected with an NTC resistor through a line, the eighteenth pin of the U6 is electrically connected with a relay RT1 through a line, and the eighteenth, nineteenth, twenty-first and twenty-second pins of the U6 are internally provided with operational amplification circuits and are electrically connected with a resistor RS1 through a line. The utility model solves the problems that a Hall sensor usually needs to be installed inside the existing fan drive to measure the rotating speed of the fan so as to control the three-phase permanent magnet synchronous motor to rotate forwards and backwards according to any rotating speed in a specified range and realize starting and stopping, and the Hall sensor may generate delay and is inconvenient to use. And the cost of the fan driving module is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of fan drive modules, in particular to a single-phase power supply to three-phase AC controllable speed fan drive module. Background Art

[0002] A fan is a common mechanical device used to achieve ventilation, air circulation, exhaust of harmful gases or cooling by generating airflow. When the fan rotates, a drive module is required to make it rotate.

[0003] However, it still has the following disadvantages in actual use:

[0004] Hall sensors are usually installed inside existing fan drives to measure the fan's rotation speed, thereby controlling the three-phase permanent magnet synchronous motor to rotate forward and reverse at any speed within the specified range, and to start and stop. However, the use of Hall sensors may cause delays and increase the cost of the fan drive module. Utility Model Content

[0005] The purpose of the utility model is to provide a single-phase power supply to three-phase AC controllable speed fan drive module to solve the problem proposed in the above background technology that a Hall sensor is usually required to be installed inside the existing fan drive to measure the speed of the fan, so as to control the three-phase permanent magnet synchronous motor to rotate forward and reverse at any speed within the specified range, and to start and stop, while the use of Hall sensors may cause delays and increase the cost of the fan drive module.

[0006] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0007] The utility model is a single-phase power supply to three-phase AC controllable speed fan drive module, comprising:

[0008] A three-phase PWM control component, the three-phase PWM control component includes U6, an IGBT tube, a three-phase permanent magnet motor, an NTC resistor, a relay RT1, an amplifier circuit and a resistor RS1;

[0009] The 3rd to 8th pins of U6 are electrically connected to the IGBT tube through the circuit, the IGBT tube is electrically connected to the three-phase permanent magnet motor through the circuit, the 17th pin of U6 is electrically connected to the NTC resistor through the circuit, the 18th pin of U6 is electrically connected to the relay RT1 through the circuit, and the 18th, 19th, 20th, 21st, and 22nd pins of U6 contain an operational amplifier circuit and are electrically connected to the resistor RS1 through the circuit.

[0010] Furthermore, the power supply assembly includes a fuse F1, a varistor R1, and a PTC resistor RY1;

[0011] The fuse F1, the varistor R1 and the PTC resistor RY1 are connected in series.

[0012] Furthermore, it also includes a driving assembly, wherein the driving assembly includes a driver;

[0013] The drivers are U4, U7 and U9, and the drivers are electrically connected to the three-phase permanent magnet motor through a line.

[0014] Furthermore, the PFC component includes U3 and a boost MOS tube Q1;

[0015] The fourth pin of U3 is electrically connected to the boost MOS tube Q1 through a line.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] This utility model uses a single-phase 220V50HZ AC power supply, which is converted into a 390V DC power supply through a high power factor and low harmonic distortion PFC circuit. Then, by using Fengqi's FU6812 series MCU to write a program, the three-phase permanent magnet synchronous motor is controlled to rotate forward and reverse at any speed within the specified range, and can be started and stopped at any time. No Hall sensor is required, and the angle of the motor is automatically identified to achieve smooth starting. The operating power can reach 200W. It allows users to easily control the start and stop and speed of the three-phase AC fan. With the integrated controller, hundreds of fans can be used at the same time, and a computer can be used for centralized control. At the same time, because the product design uses a high PF value and low harmonic distortion solution, it can work efficiently in the same power grid.

[0018] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is the structural diagram of the utility model;

[0021] Figure 2 This is a block diagram of the utility model;

[0022] Figure 3 This is the first circuit diagram of the utility model;

[0023] Figure 4 This is the second circuit diagram of the utility model;

[0024] Figure 5 This is the third circuit diagram of the utility model;

[0025] Figure 6 This is the fourth circuit diagram of the utility model. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific implementation methods disclosed below.

[0028] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the implementation of the present invention, for the sake of convenience, the cross-sectional diagram showing the device structure will not be partially enlarged according to the general scale, and the schematic diagram is only an example, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0029] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] See also Figure 1-6 As shown, this embodiment is a single-phase power supply to three-phase AC controllable speed fan drive module, including:

[0031] A three-phase PWM control component, the three-phase PWM control component includes U6, an IGBT tube, a three-phase permanent magnet motor, an NTC resistor, a relay RT1, an amplifier circuit and a resistor RS1;

[0032] The 3rd to 8th pins of U6 are electrically connected to the IGBT tube through the circuit, the IGBT tube is electrically connected to the three-phase permanent magnet motor through the circuit, the 17th pin of U6 is electrically connected to the NTC resistor through the circuit, the 18th pin of U6 is electrically connected to the relay RT1 through the circuit, and the 18th, 19th, 20th, 21st, and 22nd pins of U6 contain an operational amplifier circuit and are electrically connected to the resistor RS1 through the circuit;

[0033] Pins 3-8 of U6 are three-phase PWM outputs with dead-zone control. Through 20KHZ pulse width modulation, PWM is output to U4, U7, and U9, which then drive IGBT tubes Q4, Q5, Q6, Q7, Q9, and Q11 to connect to the three-phase permanent magnet motor to generate three-phase sinusoidal current to drive the motor to rotate;

[0034] The 17th pin of U6 is ADC, which detects the change of NTC resistance. When NTC detects that the temperature of the mainboard exceeds 70 degrees, U6 will start the high temperature alarm. The alarm signal is fed back to the control end through UART, and it will stop working at the same time.

[0035] The 18th pin of U6 is ADC, which detects whether the DC390V power supply voltage is normal through the voltage divider circuit composed of R26, R27, R29, and R31. If the power supply is too low, the motor stops and an alarm is sounded. If the voltage is normal, the 15th pin of U6 controls the relay RT1 to close, so that the working current of the motor avoids RY1.

[0036] The 18th, 19th, 20th, 21st, and 22nd pins of U6 contain operational amplifier circuits to detect the current flowing through the sampling resistor RS1 of the three-phase motor, which is used to analyze the motor operation status and adjust the PWM drive signal in real time. Through internal software calculation, the motor can be controlled to start and run smoothly without the need for an external Hall circuit. It also realizes the control of forward and reverse rotation, and has an overcurrent protection function;

[0037] The power supply components include a fuse F1, a varistor R1, and a PTC resistor RY1;

[0038] The fuse F1, varistor R1 and PTC resistor RY1 are connected in series;

[0039] Connect to AC220V through CN1, use fuse F1 for overcurrent protection, varistor R1 for surge protection, PTC resistor RY1 to limit starting current, C2, C3, CY1, CY2, L2 for EMI, rectifier output 310V through bridge BD1 and C4, provide power to U1 through L1, D1, EC1, DC-DC circuit with U1 and T1, U2, Q3 as the core, rectifier output two sets of power from D5 and D4: 15V, power U3, start the PFC circuit with U3, Q1, D1, L1 as the core, and let EC1 output 390V stably. At the same time, 15V powers the three-phase PWM signal source with U6 as the core. The other set is an isolated output 12V, which is completely isolated from AC220V and provides a safe power supply for external control and communication terminals;

[0040] A drive assembly, the drive assembly comprising a driver;

[0041] The drivers are U4, U7 and U9, and the drivers are electrically connected to the three-phase permanent magnet motor through a line;

[0042] U4, U7, and U9 are half-bridge gate drivers FD2606S, and Q4-Q11 use IGBT tubes, which have high working efficiency, low heat generation, and stable performance;

[0043] The PFC components include U3 and boost MOS tube Q1;

[0044] The fourth pin of U3 is electrically connected to the boost MOS tube Q1 through a circuit;

[0045] U3 can monitor the AC grid voltage waveform through the 4th pin, and drive the working current of the boost MOS tube Q1 according to the grid voltage waveform, so that the entire circuit board works in a state of high power factor and low harmonic distortion. The power factor exceeds 95%, and the harmonic distortion current is less than 10%;

[0046] Working principle: The driver module receives instructions through the UART communication interface, including: start code, start / stop code, forward / reverse data, speed target data, check code information, and returns the following information through the UART communication interface: start code, current speed, motor working current, error code, check code. Through a concise and complete closed-loop control logic, the problem is solved for the customer.

[0047] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. Single-phase power supply to three-phase AC controllable speed fan drive module, characterized in that: include: A three-phase PWM control component, the three-phase PWM control component includes U6, an IGBT tube, a three-phase permanent magnet motor, an NTC resistor, a relay RT1, an amplifier circuit and a resistor RS1; The 3rd to 8th pins of U6 are electrically connected to the IGBT tube through the circuit, the IGBT tube is electrically connected to the three-phase permanent magnet motor through the circuit, the 17th pin of U6 is electrically connected to the NTC resistor through the circuit, the 18th pin of U6 is electrically connected to the relay RT1 through the circuit, and the 18th, 19th, 20th, 21st, and 22nd pins of U6 contain an operational amplifier circuit and are electrically connected to the resistor RS1 through the circuit.

2. The single-phase power supply to three-phase AC controllable speed fan drive module according to claim 1 is characterized in that: It also includes power supply components including fuse F1, varistor R1, and PTC resistor RY1; The fuse F1, the varistor R1 and the PTC resistor RY1 are connected in series.

3. The single-phase power supply to three-phase AC controllable speed fan drive module according to claim 1 is characterized in that: Also included is a drive assembly, the drive assembly including a driver; The drivers are U4, U7 and U9, and the drivers are electrically connected to the three-phase permanent magnet motor through a line.

4. The single-phase power supply to three-phase AC controllable speed fan drive module according to claim 1 is characterized in that: It also includes PFC components including U3 and boost MOS tube Q1; The fourth pin of U3 is electrically connected to the boost MOS tube Q1 through a line.

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