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Bridgeless fly-back converter with high power factor

A flyback converter, high power factor technology, applied in the direction of output power conversion device, DC power input conversion to DC power output, high-efficiency power electronic conversion, etc., can solve the problems of increasing circuit cost and volume, and achieve volume and The effect of cost reduction, efficiency improvement and loss reduction

Active Publication Date: 2012-07-04
JIANGSU ZHONGHAI HUA HE ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Then figure 2 The circuit shown requires the use of two transformers, increasing the cost and size of the circuit

Method used

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  • Bridgeless fly-back converter with high power factor
  • Bridgeless fly-back converter with high power factor
  • Bridgeless fly-back converter with high power factor

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Embodiment Construction

[0020] The content of the present invention will be further described below in conjunction with the block diagram of the present invention and the schematic diagrams of specific embodiments.

[0021] refer to image 3 , The bridgeless flyback converter of the present invention includes: an output side circuit 101 , a transformer 102 and an output side circuit 103 .

[0022] The input side circuit 101 includes a diode D1, a diode D2, a capacitor Cin, a switch Q1 and a switch Q2. Among them, the anode of the diode D1 is connected to the cathode of the diode D2 and connected to Cin and one end of the AC input, the cathode of the diode D1 is connected to the same-named end of the first winding W1 of the transformer, and the opposite-named end of the first winding W1 of the transformer is connected to the end of the switch tube Q1 Drain, the source of the switching tube Q1 is connected to the drain of the switching tube Q2, the other end of the capacitor Cin and connected to the o...

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PUM

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Abstract

The invention relates to a bridgeless fly-back converter with high power factor. The existing converter is high in hardware cost and large in volume. The bridgeless fly-back converter with high power factor comprises an input side circuit, a transformer and an output side circuit. The input side circuit comprises a diode D1, a diode D2, a capacitor Cin, a switching tube Q1 and a switching tube Q2. The transformer is of a three-winding structure and comprises a first winding W1, a second winding W2 and a third winding W3. The output side circuit comprises a diode D3 and an output capacitor Co. Compared with a traditional full-bridge rectification circuit, the bridgeless fly-back converter with high power factor reduces consumption of a diode, improves circuit efficiency, and is remarkable in efficiency improvement especially when input voltage is low.

Description

technical field [0001] The invention belongs to the technical field of switching power supplies, and relates to a bridgeless flyback converter with high power factor and high efficiency. Background technique [0002] Traditional flyback converters use full-bridge rectification to convert the input AC to DC levels, such as figure 1 shown. The disadvantage of using this kind of full-bridge rectification is that in the conduction circuit of the switch tube in each switching cycle, there will be two diodes in addition to the switch tube. D2 and D3 are turned on during the half cycle, which increases the loss of the circuit. Therefore, a new topology is needed to reduce the loss and improve the efficiency of the flyback converter. An existing scheme such as figure 2 As shown, in the positive half cycle of the AC input, the switch tube Q1 is working, and the switch tube Q2 is always in the off state. In the negative half cycle of the AC input, the switching tube Q2 works,...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M1/42
CPCY02B70/126Y02B70/10Y02P80/10
Inventor 谢小高王坚赵晨蓝舟
Owner JIANGSU ZHONGHAI HUA HE ENVIRONMENTAL PROTECTION CO LTD
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