Interleaved power factor corrector with approximate open-loop control

Abstract

The invention provides an interleaved power factor corrector with approximate open-loop control in the technical field of power electronics. The interleaved power factor corrector comprises a rectification circuit, an input voltage detecting circuit, a booster circuit, an output detecting circuit, a voltage polarity detecting circuit and a control unit, wherein the rectification circuit, the input voltage detecting circuit, the booster circuit and the output detecting circuit are cascaded with one another in turn; and the voltage polarity detecting circuit, the input voltage detecting circuit, the booster circuit and the output detecting circuit are respectively connected with a control unit. By using the invention, conversion between an alternating current and a direct current is realized; and the interleaved power factor corrector provided by the invention has the advantages of linear input impedance, high power grade, simple structure, easiness in control and low cost.

Description

technical field [0001] The invention relates to a power factor corrector in the technical field of power electronics, in particular to an interleaved power factor corrector with approximate open-loop control. Background technique [0002] The traditional unit input power factor AC-DC converter generally adopts a single-phase PFC (Power Factor Correction, power factor correction) circuit, which needs to detect the input voltage, output voltage and inductor current to form a double closed-loop control of feedforward and feedback. To achieve the requirement of unit input power factor. [0003] With the development of high-power circuits, higher requirements are put forward for the withstand voltage and current resistance of devices. Although the traditional unit input power factor AC-DC converter has complete functions and high performance, the control is cumbersome, the cost is high, and the ability to withstand voltage and current is limited, so it is not suitable for high-p...

AI Technical Summary

Problems solved by technology

Although the traditional unit input power factor AC-DC converter has complete functions and high performance, the control is cumbersome, the cost is high, and the ability to withstand voltage and current is limited, so it is not suitable for high-power applications.

[0004] After searching the existing technologies, it was found that "Research and Implementation of High-power Single-phase Digital APFC (Active Power Factor Correction)" (Shanghai Jiaotong University Master's Degree Thesis, January 2009), "New Control Realization of Digital Active PFC with Strategy" (Power Electronics Technology, Issue 2, Volume 44, 2010), Chinese Patent No.: 200410009471.5, Invention Name: Realization of Digital Active PFC with New Control Strategy and Chinese Patent Application No.: 200810146300.5 , Invention name: Air conditioner PFC enabling control method, the PFC circuit described requires a lot of detection, and all need to detect the output voltage, inductor current, etc., especially the detection of the inductor current is cumbersome, and requires input feedforward and output Feedback double closed-loop control, resulting in complex control

In high-power applications, in order to meet higher power level requirements, devices such as power switches with higher withstand voltage and current resistance are required, and the cost is relatively high

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