AC-DC Converter and Its Power Factor Correction Method

Abstract

An alternating-direct current conversion device and a power factor correction method therefor. The alternating-direct current conversion device contains a rectification circuit (10) and an active power factor correction circuit (20). The rectification circuit is electrically connected to a power supply (100) and used to convert an alternating current into a direct current, and has a positive electrode output end (12) and a negative electrode output end (14) for outputting the direct current. One side of the active power factor correction circuit is electrically connected to the rectification circuit, and the other side thereof is electrically connected to a load (200), which is used to suppress the voltage ripple output to the load.

Description

technical field [0001] The present invention relates to a power conversion device, and more specifically refers to an AC-DC conversion device and a power factor correction method thereof. Background technique [0002] Press, the traditional AC-DC conversion device such as figure 1 As shown, it includes a rectifier circuit 300 and an output capacitor C. The rectifier circuit 300 converts an AC power supply into a DC power supply. The output capacitor C is connected across the output terminal of the rectifier circuit, and the output capacitor C is used for connecting a load in parallel. 400. When the AC-DC conversion device operates, the input voltage and the input current of the AC power supply are in different phases, resulting in a low power factor and serious current total harmonic distortion. In addition, only when the voltage of the DC power source is higher than the voltage of the output capacitor C, the output capacitor C will be charged, so the charging time of the ...

AI Technical Summary

Problems solved by technology

However, active power factor correction circuits need to use additional active switching components, which tend to have the disadvantages of high electromagnetic noise and low durability. Therefore, how to improve the above disadvantages has always been the direction of the industry's painstaking efforts.

In addition, in order to reduce the ripple of the output voltage on the load, the aforementioned output capacitor must use a high-capacity electrolytic capacitor. The electrolytic capacitor is prone to leakage of electrolyte due to long-term heating, which will shorten the service life of the circuit. shorten

Images