Boost power factor correction (PFC) converter adopting small-capacity long-service-life energy-storage capacitor

Abstract

The invention discloses a boost power factor correction (PFC) converter adopting a small-capacity long-service-life energy-storage capacitor. The boost PFC converter comprises a main power circuit and a control circuit, wherein the energy-storage capacitor in the main power circuit is the small-capacity long-service-life capacitor, and the control circuit comprises a differential sampling phase shift circuit, a rectifying circuit, a peak value sampling circuit, an adder and substracter circuit, an output voltage feedback control circuit, a multiplying unit, a PFC chip and a switching tube drive circuit. A simple harmonic current injection method is adopted to perform control and balancing of instant input power and output power, an energy-storage capacitor value can be decreased under the condition that the input power factor is ensured, the converter can use other types of capacitors, such as a thin-film capacitor or a ceramic capacitor and other small-capacity and long-service-life capacitors to replace an electrolytic capacitor, the obvious defect that a traditional electrolytic capacitor serving as the energy-storage capacitor is large in volume and short in service life and the like is overcome, and the boost PFC converter has the advantages that the power supply power density is remarkably improved, the service life is prolonged and the like.

Description

technical field [0001] The invention relates to the field of AC-DC converters of electric energy conversion devices, in particular to a Boost PFC converter using small-capacity and long-life energy storage capacitors. Background technique [0002] With the development of power electronics technology, the requirements for power supply are getting higher and higher. In mines, diving, emergency rescue, military equipment, urban landscape lighting and large-screen display, in addition to requiring high efficiency, high input power factor, and high power density In addition, it must also have the advantage of long life. These power supplies must have PFC (Power Factor Correction) functionality. Traditional Boost PFC converters use electrolytic capacitors as energy storage capacitors to balance instantaneous input power and output power. Although electrolytic capacitors have the characteristics of high withstand voltage and large capacitance, their large volume affects the furthe...

AI Technical Summary

Problems solved by technology

Traditional Boost PFC converters use electrolytic capacitors as energy storage capacitors to balance instantaneous input power and output power. Although electrolytic capacitors have the characteristics of high withstand voltage and large capacitance, their large volume affects the further improvement of power density. Moreover, the life of electrolytic capacitors is only a few thousand hours, which seriously affects the long life requirements of the power supply and restricts the development of power supply technology

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