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Dimming circuit

專利號
US11617248B2
公開日期
2023-03-28
申請人
Delta Electronics (Shanghai) Co., Ltd.（CN Shanghai）
發(fā)明人
Yugang Bao; Xinghua Zhang; Xiaoping Fu
IPC分類
H05B45/375; H05B45/10
技術(shù)領(lǐng)域
dimming,idim,current,dcm,ith1,control,mode,circuit,sampling,inductor
地域： Shanghai

摘要

A dimming control method and a dimming circuit are used to control the brightness of a LED. The dimming circuit includes a power conversion unit having an input end, an output end, an inductor, and a switch. When the dimming current signal is higher than or equal to a first current threshold, the switch is controlled such that the power conversion unit operates in a continuous Conduction mode or a boundary Conduction mode; when the dimming current signal is lower than the first current threshold, the switch is controlled such that the power conversion unit operates in a discontinuous Conduction mode; and when the dimming current signal is lower than a second current threshold, the switch is controlled such that the power conversion unit operates in a chopping control mode.

說明書

FIG. 7 is a schematic diagram illustrating a control waveform adopting a control strategy I, i.e., a constant frequency DCM mode according to the first embodiment of the invention.

FIG. 8 is a schematic diagram illustrating a control waveform in the constant frequency DCM mode and the CCM mode according to the first embodiment of the invention.

FIG. 9 is a complete control flow diagram adopting a control strategy I in stage two according to the first embodiment of the invention.

FIG. 10 is a schematic diagram illustrating a control waveform within a full load range adopting the control strategy I in stage two according to the first embodiment of the invention.

FIG. 11 is a complete control flow diagram adopting a control strategy II, i.e., a variable frequency DCM mode and the constant frequency DCM mode, according to the first embodiment of the invention.

FIG. 12 is a schematic diagram illustrating a control waveform in the variable frequency DCM mode according to the first embodiment of the invention.

FIG. 13 is a schematic diagram illustrating a control waveform in the variable frequency DCM mode and the CCM mode according to the first embodiment of the invention.

FIG. 14 is a schematic diagram illustrating a control waveform within a full load range adopting the control strategy II in stage two according to the first embodiment of the invention.

權(quán)利要求

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