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LED drive device with valley fill circuit

A LED driving and valley-filling circuit technology, which is applied in the direction of lamp circuit layout, lighting devices, electric light sources, etc., can solve the problems of narrow conduction angle of rectifier diodes, distortion of AC input current, and reduction of active power, so as to achieve simple circuits and low cost. Total harmonic distortion, low cost effect

Inactive Publication Date: 2015-10-14
CHENGDU ETC CERTIFICATION GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existence of large-capacity filter capacitors, the conduction angle of the rectifier diode becomes very narrow, and it can only be turned on near the peak value of the AC input voltage, resulting in severe distortion of the AC input current and becoming a peak pulse.
This current waveform contains a large number of harmonic components, which not only pollutes the power grid, but also leads to a significant reduction in the output active power after filtering, which greatly reduces the power factor.

Method used

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  • LED drive device with valley fill circuit

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Effect test

Embodiment 1

[0017] Such as figure 1 As shown, the LED driving device with a valley filling circuit in this embodiment includes a bridge rectifier module connected to the mains, a constant current module connected to the bridge rectifier module, a filter capacitor C3, an LED load and a valley filling circuit; Among them: the bridge rectifier module is a full-bridge rectifier bridge BD1, and the full-bridge rectifier bridge BD1 is a rectifier bridge that is connected and packaged as one by 4 rectifier diodes in the form of a bridge-type full-wave rectifier circuit, which has two inputs Terminal and two output terminals, the two output terminals are DC output positive pole and DC output negative pole respectively. The two input terminals of the full-bridge rectifier bridge stack BD1 are connected to the mains, respectively connected to the live line L and the neutral line N of the mains; the DC output negative pole of the full-bridge rectifier bridge stack BD1 is grounded; the DC output posi...

Embodiment 2

[0023] On the basis of Embodiment 1, the LED driving device in this embodiment further includes a diode D1 for isolating the valley filling circuit and the bridge rectifier module and a fuse F1 for surge protection.

[0024] The full-bridge rectifier bridge stack BD1 is connected to the live line L of the mains through the fuse F1. The fuse F1 has a certain resistance value, can absorb the peak voltage, and has the function of anti-surge.

[0025] The positive pole of the diode D1 is connected to the positive pole of the DC output of the full-bridge rectifier bridge stack BD1, and the negative pole is connected to the capacitor C4, the negative pole of the diode D2, the voltage dividing resistor R5, and the positive pole of the LED load. D1 is an isolation diode, which can separate the full-bridge rectifier bridge stack BD1 from the valley-filling circuit. The capacitor C3 is connected to the positive pole of the DC output of the full-bridge rectifier bridge stack BD1.

[002...

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Abstract

The invention discloses an LED drive device with a valley fill circuit. The device includes a bridge rectification module connected to commercial power, a valley fill circuit, a filter capacitor C3, a constant current module connected to the bridge rectification module, and an LED load connected to both the bridge rectification module and the constant current module. One end of the filter capacitor C3 is connected to the output end of the bridge rectification module, and the other end of the capacitor C3 is connected to the ground. The valley fill circuit is connected to the output end of the bridge rectification module. The valley fill circuit is additionally adopted to greatly increase a conduction angle of a rectifier diode, input currents are made to change from spike pulses into waveforms similar to sine waves through valley point filling, the total harmonic distortion is substantially reduced, and a power factor can be increased to be around 0.9. The LED drive device has the advantages of simple structure and low cost.

Description

technical field [0001] The invention relates to the field of LED driving circuits, in particular to an LED driving device with a valley filling circuit. Background technique [0002] As a new type of green light source, LED light source has been more and more widely used due to its advantages of low power consumption, long life, fast response, high efficiency and energy saving. [0003] Under the same brightness, the LED light source consumes only one tenth of the power of ordinary incandescent lamps, but its life can be extended by 100 times. But its life is largely determined by the driving power supply, so a reliable, high conversion efficiency, and long-life LED driving power supply is very important for LED light sources. [0004] At present, the power supply method of LED lamps mostly adopts DC, and the mains power supply needs to be converted into DC through a rectifier bridge, and then drive the LED lamp beads to emit light through a driving circuit. Its input part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 黄其
Owner CHENGDU ETC CERTIFICATION GRP CO LTD
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