A start method for DC frequency conversion compressor

Abstract

The present invention discloses a method for actuating a direct current frequency conversion compressor. The method comprises the following procedures: 11) detecting a true vale of the electric voltage of the power supply source; and 12) according to the obtained true value of electric voltage of the power supply source, adjusting the duty ratio of the pulse width modulating signal of the frequency conversion driving electric power source to the number of the true value of the electric voltage of the power supply source, and actuating the direct current frequency conversion compressor. The duty ratio is corresponding to the voltage of the electric power source and can lead to that the direct current frequency conversion compressor obtains the direct current voltage required in normal actuating. The method provided by the invention can facilitate that the direct current voltage outputted by the frequency conversion electric power source is in an appropriate range and the direct current motor obtains an appropriate actuation driving voltage through changing the duty ratio of the frequency conversion driving electric power source at the state that the voltage of the power-line is unstable. Thereby the direct current frequency conversion compressor can be normally actuated no matter the value of the supplied voltage of the electric power source.

Description

technical field [0001] The invention relates to DC motor technology, in particular to a starting method for a DC variable frequency motor. Background technique [0002] DC inverter compressors have been widely used in the field of air conditioning. The DC variable frequency compressor is driven by a DC motor. The specific driving method is: firstly convert the power frequency commercial power into a DC power supply and send it to the power module. The power module is controlled by the control signal sent by the microcomputer to output a variable voltage DC Power supply, this DC power is sent to the DC motor of the compressor to control the displacement of the compressor. [0003] Since the compressor uses a DC motor, and provides different driving voltages to the DC motor to obtain a suitable compressor working displacement. Compared with fixed-frequency compressors, DC variable-frequency compressors can make the motor run at a higher speed when the current temperature is ...

AI Technical Summary

Problems solved by technology

Such an excessively high bus voltage value will cause the DC power supplied to the DC variable frequency motor to be seriously high, resulting in an excessively high motor current. In serious cases, it will cause excessive current when the compressor starts, which will have a serious impact on the service life of the motor.

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