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Single-stage low-switch-stress and low-output-ripple LED drive circuit

A technology of LED driving and switching stress, applied in the field of LED lighting driving power supply design, can solve the problems of unsolved switching stress, large output low frequency ripple, large switching stress, etc., to achieve energy utilization, reduce output low frequency ripple, The effect of reducing voltage stress

Inactive Publication Date: 2017-03-22
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the single-stage PFC flyback converter has a large output low-frequency ripple, and at the same time, the primary side MOS switch tube has a large switching stress; and some existing ripple removal methods, or have not solved the switch stress problem, which is not conducive to the switch tube The selection and efficiency improvement; or the combination circuit switches are isolated from each other, which brings the complexity of control

Method used

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  • Single-stage low-switch-stress and low-output-ripple LED drive circuit

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] 1. If figure 1 As shown, this embodiment provides a single-stage LED driver circuit with low switching stress and low output ripple, including input AC power u in , diode rectifier bridge BD 1 , main transformer T r1 , auxiliary transformer T r2 , the first power MOS switch tube S 1 , the second power MOS switch tube S 2 , the first power diode D 1 , the second power diode D 2 , the third power diode D 3 , the fourth power diode D 4 , the fifth power diode D 5 , the sixth power diode D 6 , electrolytic capacitor C 1 , the first output capacitor C o1 , the second output capacitor C o2 , Output filter inductance L f , LED light load; the main transformer T r1 By primary excitation winding N 11 , secondary winding output N 12 and N 13 and leakage inductance L k constituted, the auxiliary transformer T r2 By the demagnetization wi...

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Abstract

The invention relates to a single-stage low-switch-stress and low-output-ripple LED drive circuit comprising an input alternating-current power supply uin, a diode rectifier bridge BD1, a main transformer Tr1, an auxiliary transformer Tr2, a first power MOS switch tube S1, a second power MOS switch tube S2, a first power diode D1, a second power diode D2, a third power diode D3, a fourth power diode D4, a fifth power diode D5, a sixth power diode D6, an electrolytic capacitor C1, a first output capacitor Co1, a second output capacitor Co2, an output filter inductor Lf, and an LED lamp load. The LED drive circuit based on combination of a single-stage AC-DC converter Flyback and an auxiliary converter Forward is constructed, so that high-efficiency, low-voltage-stress, low-output-ripple, and constant current output functions are realized.

Description

technical field [0001] The invention relates to the design field of LED lighting driving power supply, in particular to a single-stage LED driving circuit with low switch stress and low output ripple. Background technique [0002] LED is essentially a light-emitting diode, and its volt-ampere characteristics determine that it is suitable for constant current operation. For the design of the drive power supply, it is first necessary to select an appropriate circuit structure. According to different application occasions and requirements, it can generally be divided into single-stage scheme and two-stage structure scheme, both of which have their own advantages and disadvantages according to the application power occasion and specific application requirements. The two-stage PFC scheme has the advantages of small total harmonic distortion (THD) and close to unity value of power factor (PF), but the two-stage conversion means that more main power devices and control ICs are use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/37Y02B20/30
Inventor 林维明郭跃森
Owner FUZHOU UNIV
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