Control device of power factor correcting circuit and control method

Abstract

The invention provides a control device of a power factor correcting circuit and a control method. The power factor correcting circuit (200) is driven by the input of an input circuit (100), the control device comprises a sampling circuit (300), a driving circuit (400) and a control circuit (500), wherein the control circuit (500) comprises a processing unit (510), the sampling circuit (300) acquires the status signal of the power factor correcting circuit (200), and sends the signal to the processing unit (510), the processing unit (510) controls the output parameters of the control circuit (500) according to the status signal so as to control the driving circuit (400), and the driving circuit (400) outputs corresponding driving signals so as to control the power factor correcting circuit (200). The invention has the advantage that the control has sufficient phase margin, wide gain bandwidth and high gain.

Description

technical field [0001] The invention relates to a control device and a control method of a power factor correction circuit. Background technique [0002] The structure of the current automated electrical system such as figure 1 As shown, the circuit performing the corresponding function is the power factor correction circuit 200, and its output signal is fed back to the control circuit 500 through the sampling circuit 300 to correct its power factor (PF) and obtain the desired output. [0003] In the field of communication power supply products, the power factor correction circuit 200 is the main power circuit, and most of the inductor cores used in it are iron powder cores, sendust, amorphous materials, ferrite, etc. [0004] The control circuit 500 of the communication power supply product usually implements traditional PI control through analog or digital control. The traditional PI control method has the advantages of simple implementation and convenient parameter sett...

AI Technical Summary

Problems solved by technology

Moreover, since the current loop bandwidth of the power factor correction circuit 200 is inversely proportional to the inductance value of the inductance of the power factor correction circuit 200, as the output load increases, the DC magnetizing force will increase, resulting in an inductance of the inductance of the power factor correction circuit 200 value decreases, so that the current loop bandwidth of the power factor correction circuit 200 increases continuously

Generally speaking, in the actual application of communication power supply products, when the output is continuously loaded from no load to full load, the inductance value of the inductor of the power factor correction circuit 200 will usually drop significantly, and the current loop bandwidth of the power factor correction circuit 200 will change. It makes it difficult for the control loop to meet the phase margin and gain margin requirements in the full load range

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