A PFC circuit with current sharing control module and the corresponding current sharing control method

A current control and circuit technology, which is applied in the field of two-way parallel boost PFC circuit and its current sharing control, can solve the problems of PFC circuit hardware circuit complexity, poor inductor current sharing characteristics, and inability to achieve current sharing, etc., to achieve Realize the effect of true current sharing, good current sharing characteristics, and good current sharing characteristics
CN101217255AActive Publication Date: 2008-07-09EMERSON NETWORK POWER CO LTD
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
EMERSON NETWORK POWER CO LTD
Publication Date
2008-07-09

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Abstract

The invention discloses a PFC circuit which is provided with an average current control module, comprising a first boosting circuit, a second boosting circuit and the average current control module. The average current control module comprises a sampling unit, a difference value operating unit, a proportion integral unit and a duty ratio regulating unit which are connected one by one. The duty ratio regulating unit realizes the average current of the inductance current mean in a switch cycle. The invention also discloses an average current control method used for the PFC circuit, and the method comprises the following steps: A. a reference current is produced; B. the current is sampled and the difference value is operated to obtain the inductance current difference value of two parallel branches; C. control signal one of the first boosting circuit is produced through operation; D. control signal two of the second boosting circuit is produced through operation; E. the duty ratio of the two branches is obtained by regulating the duty ratio.
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Description

technical field

[0001] The invention relates to a PFC (Power Factor Correction) circuit, in particular to a two-way parallel boosting PFC circuit with a current equalizing control module and a current equalizing control method thereof. technical background

[0002] With the improvement of the power level of the power supply, the traditional single-phase boost PFC circuit is no longer suitable for the front-end rectification circuit of the high-power power supply. In the application occasions of high current and high power, multiple parallel Boost PFC circuits are often used. Since the interleaved multi-channel parallel Boost PFC circuit has the characteristics of small input current and output current ripple and small branch power level, it has been more and more widely used in medium and high-power power supplies. The multi-channel parallel Boost PFC circuit must not only ensure that the total input current is in phase with the rectified voltage, but also meet the requirem...

Claims

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