Double-path PFC control circuit and method

Abstract

The invention provides a two-path PFC control circuit and a method, and the circuit comprises a first PFC main loop which is connected with a first rectifier bridge and a second rectifier bridge, and a second PFC main loop which is connected with the first rectifier bridge and the second rectifier bridge; a PFC control loop is connected to the first PFC main loop and the second PFC main loop; a first enabling control circuit and a second enabling control circuit are respectively connected to the PFC control loop; a bus voltage control loop is connected to the PFC control loop, the first PFC main loop and the second PFC main loop; a bus circuit is connected to the first PFC main loop and the second PFC main loop; a first driving signal enhancement loop is connected to the first PFC main loop and the PFC control loop, and a second driving signal enhancement loop is connected to the second PFC main loop and the PFC control loop. Through software and hardware control, switching-on and switching-off of the two PFC loops are achieved, the bus voltage is adjusted through software and hardware control, and adjustment of the bus voltage is achieved according to different output loads so as to optimize the efficiency of the driver.

Description

technical field [0001] The invention relates to the technical field of PFC, in particular to a dual-channel PFC control circuit and method. Background technique [0002] The traditional PFC control technology is to control the on and off of the IGBT through software. In the case of heavy load, the current passing through the IGBT will be very large, which requires the use of an IGBT with higher parameters and higher requirements for heat dissipation. [0003] In the traditional PFC control technology, the bus voltage is generally controlled at 380V, which is a fixed value. [0004] In the traditional PFC control technology, the reactor needs to use an external large reactance, which is bulky and expensive. [0005] Therefore, it is hoped that the problems of large on-off current of the IGBT, constant bus voltage, large volume and high price of the reactor can be solved. Contents of the invention [0006] In view of the above-mentioned shortcomings of the prior art, the p...

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Problems solved by technology

[0006] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a dual-channel PFC control circuit and method, which is used to solve the problem of large on-off current, constant bus voltage, and large reactor volume in the prior art for controlling IGBTs. , the problem of high prices

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