Active valley-filled alternating-current and direct-current converter for improving power factor efficiency

A technology of AC-DC conversion and power factor, which is applied in the electronic field and can solve problems such as cost increase and efficiency decrease
CN103973097AActive Publication Date: 2014-08-06邳州市景鹏创业投资有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
邳州市景鹏创业投资有限公司
Publication Date
2014-08-06

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Abstract

The invention discloses an active valley-filled alternating-current and direct-current converter improving power factor efficiency. The active valley-filled alternating-current and direct-current converter is composed of a diode rectifier bridge (1), a non-linear LC network (2) and a subsequent switch power converter (3). The non-linear LC network (2) is powered by the output of the diode rectifier bridge (1), and the subsequent switch power converter (3) is powered by the output of the non-linear LC network (2). The non-linear LC network (2) is composed of an inductor L, an energy storage capacitor C, a resonance capacitor Cr and a switching network. The switching network is formed by connecting a bilateral switch K and a diode D in parallel. A charging circuit of the energy storage capacitor C is composed of the diode rectifier bridge (1), the inductor L, the diode D, the resonance capacitor Cr and the energy storage capacitor C. A discharging circuit of the energy storage capacitor C provides energy for the subsequent switch power converter (3) through the energy storage capacitor C and the bilateral switch K.
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Description

technical field

[0001] The invention belongs to the field of electronic technology, and relates to AC and DC current conversion and power control. More specifically, the present invention relates to an active valley-filling AC-DC converter with high efficiency and high power factor. Background technique

[0002] In the case of AC power supply, in order to achieve high power factor and meet the harmonic requirements of IEC61000-3-2, the AC-DC converter needs to implement the power factor correction function. The active boost power factor correction circuit is a very popular method, but it requires a relatively complicated control loop to control the active power switch to realize the power factor correction function, and its power factor can be greater than 0.98. In low-cost, widely used in low-power, cost-sensitive products such as energy-saving lamps and LED lighting, passive valley-filling power factor correction circuits (such as figure 1 Shown) Since there is no active...

Claims

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