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A single-stage non-isolated non-electrolytic capacitor LED drive power supply and switching method

A technology of LED driving and electrolytic capacitors, applied in DC/DC converters, power electronic applications, AC/DC fields, can solve the problems of low efficiency of non-isolated driving power, short life of driving power, large size, etc., to achieve high power factor, long service life, high power factor effect

Active Publication Date: 2020-07-31
惠州市双好电子有限公司
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Problems solved by technology

[0004] Aiming at the problems of short life, large volume and low efficiency of non-isolated driving power in traditional LED driving power, the present invention optimizes the traditional BOOST-BUCK driving power and interleaves BOOST-BUCK converters in parallel , proposed a single-stage non-isolated valley-filling type electrolytic capacitor-less LED drive power supply and its working method

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  • A single-stage non-isolated non-electrolytic capacitor LED drive power supply and switching method
  • A single-stage non-isolated non-electrolytic capacitor LED drive power supply and switching method
  • A single-stage non-isolated non-electrolytic capacitor LED drive power supply and switching method

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] Such as Figure 1-2 As shown, a single-stage non-isolated valley-filling LED driver power supply without electrolytic capacitors, including AC power supply, input filter inductor L f , input filter capacitor C f , bridge rectifier, switching tube Q 1 , Diode D 1 、D 2 , inductance L 1 , L 2 , fill the valley circuit, the output filter capacitor C o and LED load.

[0025] In the single stage of the above-mentioned circuit, the BOOST circuit and the BUCK circuit share the switching tubes in an interleaved and parallel manner, without forming a cascaded form. Non-isolated means that there is no electrical isolation through a transformer between the input and load terminals. There is no transformer in this circuit for electrical isolation, so it is non-isolated. Non-electrolytic capacitor means that there is no electrolytic capacitor in the circuit. All the c...

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Abstract

The invention discloses a single-stage non-isolated valley-filling type non-electrolytic capacitor LED driving power supply and a switching method. The circuit topology includes AC power supply, input filter circuit, rectifier bridge, a BOOST and BUCK interleaved parallel circuit, valley filling circuit, output filter capacitor and LED load. The AC power supply is sequentially connected to an input filter circuit, a rectifier bridge, and a BOOST and BUCK interleaved parallel circuit. The invention has the following advantages and features: 1. The output current ripple is reduced and the power factor is high; 2. The voltage stress on the capacitor in the valley-filling circuit is reduced; 3. The circuit is controlled by a switch tube, which reduces the switching loss.

Description

technical field [0001] The invention relates to the technical field of power electronics applications, in particular to a single-stage non-isolated valley-filling type electrolytic capacitor-free LED drive power supply, which is suitable for switching power supplies, especially LED drive power supplies, and belongs to AC / DC (AC / DC), DC / DC Direct current (DC / DC) converter field. Background technique [0002] Light Emitting Diode (LED) has the advantages of energy saving, environmental protection, safety, and long life, and 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. [0003] The LED driver power supply for living lighting often adopts AC power supply, but due to the imbalance between the pulsating instantaneous input power and the constant output power, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B45/345H05B44/00
CPCH05B45/37Y02B20/30
Inventor 廖志凌张珊珊邱殿成徐长波曹晨晨
Owner 惠州市双好电子有限公司
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