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A bidirectional cuk circuit-based electrolytic capacitance-free LED driving power supply and a switching method thereof

A technology of LED driving and electrolytic capacitors, which is applied in power electronics applications, AC/DC, and DC/DC converters, can solve problems affecting the service life of the driving power supply, achieve high power factor, improve stability, and prolong service life. Effect

Active Publication Date: 2018-12-14
惠州市雷凌科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims at the problem that there is an electrolytic capacitor in the flyback LED drive power supply, which affects the service life of the drive power supply, and proposes an electrolytic capacitor-free LED drive power supply based on a bidirectional cuk circuit

Method used

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  • A bidirectional cuk circuit-based electrolytic capacitance-free LED driving power supply and a switching method thereof
  • A bidirectional cuk circuit-based electrolytic capacitance-free LED driving power supply and a switching method thereof
  • A bidirectional cuk circuit-based electrolytic capacitance-free LED driving power supply and a switching method thereof

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings. A non-electrolytic capacitor LED drive power supply based on a bidirectional cuk circuit. A bidirectional cuk circuit is connected in parallel at the output end of the main circuit of the flyback converter to balance the ripple difference between instantaneous input power and output power and reduce the capacity of the output filter capacitor .

[0022] like figure 1 As shown, a non-electrolytic capacitor LED drive power supply based on a bidirectional cuk circuit, including AC input, input filter inductor Lf, input filter capacitor Cf, bridge rectifier circuit, a flyback converter, and a flyback converter output in parallel The bidirectional cuk circuit at the end, the output filter inductor Lo, the output filter capacitor Co and the LED load.

[0023] Its main circuit includes AC input, input filter inductor Lf, input filter capacitor Cf, bridge rectifier circuit, an...

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Abstract

The invention discloses a bidirectional cuk circuit-based electrolytic capacitance-free LED driving power supply and a switching method thereof. Circuit topology includes a bridge rectifier circuit, The input side of the bridge rectifier circuit is an AC input. The output side of the bridge rectifier circuit is a flyback transformer T connected in series with a first switching transistor Q1, a bidirectional cuk circuit connected in parallel with the output side of the flyback transformer T, an output filter inductor Lo, an output filter capacitor Co and an LED load. The invention has the advantages of high power factor and high constant current precision. By using bidirectional circuit to deal with the pulsating power difference between input and output power, non-electrolytic capacitor can be used instead of electrolytic capacitor, which prolongs the service life of the whole driving power supply and improves the stability of the system.

Description

technical field [0001] The invention relates to the technical field of power electronics applications, in particular to a flyback circuit and a switching method of a parallel bidirectional cuk circuit, which is suitable for switching power supplies, especially LED drive power supplies, and belongs to AC / DC (AC / DC), DC / DC (DC / DC) converter field. Background technique [0002] With the development of technology, light-emitting diodes (Light Emitting Diode, LED) have been widely used in home lighting and decoration, urban landscape lighting, road traffic lighting and other fields because of their advantages such as energy saving, environmental protection, safety, and long life. LED is the fourth-generation light source after incandescent lamps, fluorescent lamps and high-pressure gas discharge lamps. Factors such as high reliability, high power factor, long life, and low cost of the driving power supply restrict the promotion of LED lighting. In actual use, the LED drive pow...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00
Inventor 廖志凌邱殿成徐长波张珊珊曹晨晨
Owner 惠州市雷凌科技有限公司
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