Processing method and device for power-down shutdown of variable-frequency compressor

A technology of a frequency conversion compressor and a processing method, which is applied in the direction of suppressing motor vibration control, etc., can solve the problems of reducing and frequency conversion compressor vibration, etc.

Active Publication Date: 2019-05-03
SICHUAN HONGMEI INTELLIGENT TECH CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] However, when the mains suddenly fails and shuts down, before relevant protection occurs, the VFD will still run according to the main control command. As the DC bus voltage decreases, the output voltage of the VFD will decrease accordingly

Method used

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  • Processing method and device for power-down shutdown of variable-frequency compressor
  • Processing method and device for power-down shutdown of variable-frequency compressor
  • Processing method and device for power-down shutdown of variable-frequency compressor

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Embodiment Construction

[0078] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection of the present invention. scope.

[0079] like figure 1 As shown, the embodiment of the present invention provides a processing method for power-down shutdown of the inverter compressor, including:

[0080] S0: When the input voltage of the mains stops, determine whether there is an oscillating waveform in the waveform of the input current of the inverter compressor;

[0081] S1: When ...

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Abstract

The invention provides a processing method and a processing device for the power-down shutdown of a variable-frequency compressor. The method comprises the following steps of determining whether an oscillation waveform occurs in the waveform of the input current of the variable-frequency compressor or not when the voltage input of the commercial power is stopped; when it is determined that the oscillation waveform appears in the waveform of the input current of the variable-frequency compressor, determining whether the voltage value of a direct current bus is larger than a preset adjustment value or not; if yes, increasing the value range of a modulation coefficient; otherwise, adjusting the flux weakening control modulation rate, and increasing the overload frequency reduction rate. According to the scheme, the vibration of the variable-frequency compressor during the power-down shutdown process can be avoided.

Description

technical field [0001] The invention relates to the technical field of frequency conversion drive, in particular to a processing method and device for a frequency conversion compressor to be powered off and shut down. Background technique [0002] At present, when the variable frequency compressor of smart home appliances is shutting down normally, the main controller will issue a command to request the variable frequency drive to stop outputting. At this time, the variable frequency output voltage is greater than the back electromotive force of the compressor. Compressor phase current does not oscillate. [0003] However, when the mains suddenly fails and shuts down, before relevant protection occurs, the VFD will still run according to the main control command. As the DC bus voltage decreases, the output voltage of the VFD will decrease accordingly. When the electromotive force is greater than the output voltage, the counter electromotive force will charge the DC bus. At ...

Claims

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Application Information

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IPC IPC(8): H02P23/04
Inventor 徐明章
Owner SICHUAN HONGMEI INTELLIGENT TECH CO LTD
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