Series topological light-emitting diode (LED) switching power circuit

A switching power supply circuit and topology technology, applied to electrical components, adjusting electrical variables, instruments, etc., to achieve high operating frequency, high power conversion efficiency, and the effect of suppressing reverse recovery loss

Active Publication Date: 2012-12-05
广州泛基亚影视科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing circuit cannot meet the above requirements in one product, especially the product electrical conversion efficiency, product cost and work reliability, etc.

Method used

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  • Series topological light-emitting diode (LED) switching power circuit
  • Series topological light-emitting diode (LED) switching power circuit
  • Series topological light-emitting diode (LED) switching power circuit

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Such as Figure 1~3 As shown, a series topology LED switching power supply circuit includes a power input end of a series loop, an input filter 1, a series topology power conversion 2, an isolated power output 3, and a power output end. Among them, L and N are power input, RV1 is an overvoltage protection tube connected in parallel to the power input terminals L and N. Input filter 1 is composed of storage RV1, capacitor C1, common mode inductor L1, and capacitor C2, and series topology power conversion 2 Composed of directional rectifier DB1, capacitor C3, energy storage inductor L3, transformer T1, inductor L2, diode D1, switch Q1, resistor R1, DB1 rectifier circuit to provide directional AC output power, capacitor C3 in parallel with DB1 directional output loop end For AC zero-crossing compensation, the positive + terminal of DB1's directional current output is connected to one end of energy storage inductor L3 and the negative terminal of diode D1. The other end of e...

Embodiment 2

[0042] Such as Figure 4 As shown, the difference between this embodiment and embodiment 1 is that this embodiment adopts the upper driving mode, a series topology LED switching power supply circuit, the circuit includes L and N are power inputs, and RV1 is connected in parallel to the power input terminals L and N. On the overvoltage protection tube, capacitor C1, common mode inductor L1, and capacitor C2 form the input EMI filter circuit. DB1 rectifier circuit provides directional AC output power. Capacitor C3 is connected in parallel to the directional output loop end of DB1 rectifier circuit for AC zero crossing. For compensation, the positive terminal of the directional current output of DB1 is connected to the drain D of the switch Q1, the source S of Q1 is connected to the negative terminal of the diode D1 and one end of the inductor L3, and the other end of the inductor L3 is connected to one end of the primary of the transformer T1 , The other end of the primary of the ...

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PUM

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Abstract

The invention discloses a series topological light-emitting diode (LED) switching power circuit. The circuit comprises a power input end, an input filter, a series topological electrical energy converter, an isolated electrical energy output end and a power output end, which are sequentially connected in series to form a loop. The problems of low electrical energy conversion efficiency, short service life of an LED, non-constant peak points of set output current and voltage, circuit structure complexity, large size, high product cost and the like of the prior art are solved, and the circuit has the characteristics of simple structure, high electrical energy conversion efficiency, constant current and voltage peaks, small size of a high-power density product, and the like.

Description

Technical field [0001] The invention relates to an LED switching power supply circuit technology, in particular to a series topology LED switching power supply circuit. Background technique [0002] LED lighting needs a switching power supply that meets a series of modern requirements, high power conversion efficiency, constant peak point of output current and voltage setting, high power density, and it is convenient to design a topology circuit with smaller product volume and low product cost. . [0003] LED can be powered by a non-isolated power supply, but due to the relationship between safety and heat dissipation, most product applications must use isolated power supply. [0004] LED lighting products require power supply. Within the set safe working peak, the current and voltage fluctuate softly within a certain regular range, which will extend the working life of the LED. [0005] Existing circuits cannot meet the above requirements in one product, especially the electrical co...

Claims

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Application Information

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IPC IPC(8): H02M3/315
Inventor 韩腊生韩路韩镇
Owner 广州泛基亚影视科技有限公司
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