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Power factor correction circuit

A power factor correction, power stage circuit technology, applied in the power supply field, can solve problems such as miniaturization and integration of disadvantageous circuits, increase system implementation costs, etc., and achieve the effect of reducing anti-electromagnetic interference

Active Publication Date: 2012-07-25
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to realize the variability of switching frequency, frequency synthesis technology is usually used, such as using a separate dedicated chip for generating variable frequency, but the method of using a separate dedicated chip for generating variable frequency will also greatly increase the cost of system implementation, and will not Conducive to miniaturization and integration of circuits

Method used

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Embodiment Construction

[0052] Several preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made on the spirit and scope of the present invention. In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0053] The embodiment of the present invention discloses a power factor correction circuit. Through the inductor current sampling circuit, current modulation circuit and intermediate signal generation circuit in the power factor correction circuit, while realizing power factor correction, the frequency of the power switch tube is It is al...

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Abstract

The invention discloses a power factor correction circuit, comprising an inductance current sampling circuit, an intermediate signal generating circuit, a current modulating circuit and a control driving circuit, wherein the inductance current sampling circuit is used for sampling inductance current following through inductance and generating a sine half wave current signal and a sine half wave voltage signal according to the inductance current; the intermediate signal generating circuit is used for receiving the sine half wave voltage signal to generate a ramp signal and a clock signal; the current modulating circuit is used for receiving the sine half wave current signal and outputting a voltage feedback signal to generate a regulating signal, and the regulating signal is compared with the ramp signal as a carrier to generate a modulating signal; and the control driving circuit is used for receiving the modulating signal and the clock signal to generate corresponding control signals, control a power switch pipe to work with variable working frequency, ensure the consistency of an inductance current waveform and a sine half wave voltage waveform and output voltage to maintain the basic constant. According to the power factor correction circuit disclosed by the invention, the anti-electromagnetic interference can be realized and the realization cost is reduced at the same time due to the integration of a frequency dithering technology and the power factor correction circuit.

Description

technical field [0001] The invention relates to the field of power supplies, and more specifically, relates to a power factor correction circuit applied in power supplies. Background technique [0002] The AC / DC power supply in the prior art generally includes: EMI (Electromagnetic Interference, electromagnetic interference) filter network, rectifier circuit, power factor correction circuit and power stage circuit, figure 1 It is a working principle block diagram of the AC / DC power supply in the prior art. The alternating current AC is filtered by the EMI filter network 11, and after the electromagnetic interference is eliminated, the voltage output by the EMI filter network 11 is rectified by the full-bridge rectifier circuit 12, and then the voltage output from the full-bridge rectifier circuit 12 is further rectified by the power factor correction circuit 13 power factor correction, and finally input the voltage after power factor correction to the load 14 to drive the l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42H02M1/44
CPCY02B70/126H02M1/4225Y02B70/10Y02P80/10
Inventor 徐孝如
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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