Frequency converter for controlling rotating speed of inverter compressor and control method thereof
A variable frequency compressor and control method technology, applied in the field of frequency converter, can solve the problems of low efficiency and large system loss, etc., and achieve the effect of extending the conduction time, reducing the surge current and improving the overall efficiency
Pending Publication Date: 2021-09-07
黄石东贝压缩机有限公司
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Problems solved by technology
[0012] The object of the present invention is to provide a frequency converter and its control method for controlling the speed of the frequency conversion compressor in order to solve the problems of large loss and low efficiency of the overall system of the frequency converter in the prior art, including providing a new frequency converter And provide a control method to control the speed of the motor and control the speed of the variable frequency compressor, so as to reduce the loss of the frequency converter and improve the efficiency of the overall system of the frequency converter
Method used
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Embodiment 1
[0052] Embodiment 1: The present invention provides a frequency converter for controlling the speed of a frequency conversion compressor and a control method thereof.
[0053] Before explaining the frequency converter of the present invention and its control method, let's look at the structure of a typical frequency converter in the present. Such as figure 1 As shown, the frequency converter includes an NTC resistor 11, an EMI filter 1, a passive PFC inductor 12, a diode rectifier bridge 2, an inverter bridge 4, a microcontroller 8 and a low-voltage power supply 9, wherein the NTC resistor is a negative temperature coefficient resistor or similar resistors to limit the inrush current during inverter power-on; use electromagnetic interference EMI filters at the input stage to limit high-frequency signal feedback to the power line; passive PFC inductors are used to reduce the input current Iin of the inverter Harmonics; the diode rectifier bridge is used to convert alternating ...
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The invention relates to a frequency converter for controlling the rotating speed of an inverter compressor and a control method thereof. The frequency converter is provided with a filter, a rectifier bridge, a voltage control circuit, an inverter bridge and a microcontroller. The control method comprises the steps that the microcontroller controls the PWM index of the M1 to be gradually increased from zero to 100%, and a bus capacitor is gradually charged; in the actual rotating speed operation stage, the microcontroller provides a PWM control signal for the inverter bridge to start the motor and reach the set rotating speed; in the transition stage, the PWM width of M1 is gradually reduced, the bus voltage is gradually reduced, the torque of the motor is controlled, and the actual rotating speed of the motor reaches the set rotating speed; in the normal operation stage, the microcontroller analyzes the back electromotive force voltage and the proportional-integral function of the motor, recalculates the actual rotating speed of the motor, and controls the conduction period of each power switch in the inverter bridge so as to control the motor to operate at the set torque and enable the motor to keep operating at the set rotating speed. The frequency converter is low in power consumption, high in efficiency, simple in control method and easy to operate.
Description
technical field [0001] The invention relates to a frequency converter technology, in particular to a frequency converter for controlling the rotational speed of a frequency conversion compressor and a control method thereof. Background technique [0002] Inverter compressors are widely used in refrigerators, freezers, food display cabinets, commercial refrigerators and air conditioners due to their high efficiency, low noise, and miniaturization. The inverter technology and the method of controlling the speed of the inverter compressor are directly related to Compressor efficiency and overall system performance. [0003] The existing typical inverter used to control the speed of the inverter compressor generally adopts the following structure: an NTC resistor with a negative temperature coefficient, an EMI filter, an inductor, a rectifier bridge, an inverter bridge, and a microcontroller. NTC resistors are used to limit the inrush current; EMI filters are used to avoid high...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H02M5/458H02M1/32H02M1/12H02P27/08F04B49/20F04B49/06
CPCH02M5/458H02M1/32H02M1/12H02P27/08H02P27/085F04B49/20F04B49/06
Inventor 杨百昌马科斯陈宇胡扶遥陈君
Owner 黄石东贝压缩机有限公司