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led drive circuit and led lamp tube

An LED driving and circuit technology, applied in the field of LED lighting, can solve the problems of high cost and complex circuit structure, and achieve the effect of improving replaceability

Active Publication Date: 2019-01-25
CHENHUI GUANGBAO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the LED drive circuit includes both the mains conduction branch and the electronic rectifier conduction branch, the circuit structure is complex and the cost is high

Method used

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  • led drive circuit and led lamp tube
  • led drive circuit and led lamp tube
  • led drive circuit and led lamp tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] Such as figure 1 As shown, an LED driving circuit, the main part of which is a conventional high-frequency switching power supply circuit, includes a rectifying unit 1, a filtering unit 2, a first switching unit 3, an energy storage freewheeling unit 6, and a secondary filtering unit connected in sequence 7 and the PWM control unit 5 . The main improvement is that the detection unit 9 and the second switch unit 8 are added, and the two ends of the second switch unit 8 are connected to the first switch unit 3 and the energy storage freewheeling unit 6 . The input end of the detection unit 9 is connected to an AC power supply, the output end is connected to the second switch unit 8 and the PWM control unit 5, and the first switch unit 3 and the second switch unit 8 are controlled to be turned on or off by the potential level of the output end. The PWM control unit 5 collects the signal flowing through the first switch unit 3 through the sampling unit 4 , and controls the...

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PUM

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Abstract

The invention discloses an LED drive circuit, which comprises a PWM control unit, a rectification unit, a filter unit, a first switch unit, an energy storage freewheeling unit and a secondary filter unit connected in sequence, and the PWM control unit is output from the sampling unit Terminal sampling, control the first switch unit to repeatedly turn off and on, when the first switch unit is turned off, the energy storage freewheeling unit discharges the load, and also includes a detection unit and a second switch unit, the second switch unit is connected to the second switch unit A switch unit and an energy storage freewheeling unit, the input end of the detection unit is connected to an AC power supply, and the output end is connected to a PWM control unit and a second switch unit for detecting the frequency of the input current and outputting a signal to control the first switch unit and the second switch unit The second switch unit is turned off or turned on. The detection unit of the invention detects the frequency of the input alternating current, and controls the two switch units to be turned off or on, so that the LED can simultaneously have high and low frequency alternating currents, thereby improving the replaceability of the lamp tube.

Description

technical field [0001] The invention relates to the technical field of LED lighting, in particular to an LED driving circuit and an LED lamp tube. Background technique [0002] LED lamps have the advantages of energy saving, high luminous flux, and long service life, and are gradually replacing traditional fluorescent lamps. There are two options for replacement. The first is to replace the lamp directly without modifying the lamp. The second is to bypass the ballast by cutting the wire and realize single-end or double-end power supply through wiring. For example, CN203068256U discloses a LED lamp and its device for directly replacing the ballast fluorescent tube, mainly including a ballast, a starter and an LED lamp, and the LED lamp includes a rectifier circuit, a drive power conversion circuit and an LED light One end of the rectifier circuit is electrically connected to the driving power conversion circuit, the other end of the driving power conversion circuit is electr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00
Inventor 赵国松蒲纪忠周家明
Owner CHENHUI GUANGBAO TECH CO LTD