Power circuit and air conditioner

Abstract

The present invention provides a power circuit and an air conditioner. The power circuit comprises: a voltage detection module configured to detect an alternating current signal to determine corresponding power supply parameter information, wherein the input end of the voltage detection module is connected with one side of the input end of a rectification module; and a control module configured toreceive the power supply parameter information and regulate the operation parameters of a power factor correction module according to the power supply parameter information, wherein the control module is connected with the output end of the voltage detection module and the control end of the power factor correction module. According to the technical scheme, the power circuit and an air conditioner improves the reliability and the accuracy for collecting the power supply parameter information to improve the reliability of the power factor correction module, can more timely detect the voltage drop generated by the alternating current, and simplifies the interference of the rectification module on the power factor correction module so as to reduce the complexity of the power circuit at the aspects of layout and debugging.

Description

technical field [0001] The present invention relates to the technical field of power circuits, in particular, to a power circuit and an air conditioner. Background technique [0002] For high-power home appliances such as air conditioners, washing machines, and refrigerators, the reliability of their power circuits is related to the reliability of the operation of motors (such as fans and compressors, etc.). Therefore, it is necessary to monitor the load status and input AC power in real time. Signal, especially for AC signal distortion, ripple signal, surge signal, short circuit, open circuit, stalled rotor and load side power failure, etc., to reduce electrical hidden dangers and failure rates. [0003] In the related art, generally in the power supply circuit, an electrically connected rectifier module, PFC (PowerFactor Correction, power factor correction) module, electrolytic capacitor module and inverter bridge module are arranged sequentially, wherein, the rectifier mo...

AI Technical Summary

Problems solved by technology

[0004] (1) The sampling electrical signal collected at the rear stage of the rectifier module needs to be estimated to determine the phase of the AC signal. The PFC module determines the zero-crossing moment of the AC signal according to the calculated value. However, due to the difference between the calculated value and the actual value There is not only a time delay, but also an estimation bias, which will seriously affect the reliability and accuracy of the PFC module

[0005] (2) When the AC signal suddenly loses power, due to the time delay of the rectifier module, the instantaneous voltage drop cannot be detected, that is, the real-time protection of the motor cannot be realized

[0006] (3) In the connection line between the rectifier bridge module and the PFC module, it is usually necessary to add a small-capacity capacitor (preferably 200nF to 2uF) for filtering to reduce the ripple current. However, if the load is light , and the larger the value of the above capacitor, the greater the distortion of the voltage waveform output by the PFC module according to the sampling signal adjustment

Images