Variable-frequency variable-duty-ratio phase-cut dimming LED power supply and phase-cut dimming method

The invention discloses a variable-frequency and variable-duty-ratio phase-cut dimming LED power supply and a phase-cut dimming method. The method comprises the following steps of performing ADC sampling on the output voltage of a dimmer by a single-chip microcomputer; calculating a target brightnes...

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Bibliographic Details
Main Authors MA LAN, LIU ZHICHAO, LIANG KAIXUN
Format Patent
LanguageChinese
English
Published 31.07.2020
Subjects
ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
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Summary:The invention discloses a variable-frequency and variable-duty-ratio phase-cut dimming LED power supply and a phase-cut dimming method. The method comprises the following steps of performing ADC sampling on the output voltage of a dimmer by a single-chip microcomputer; calculating a target brightness value DST (n) according to a preset dimming curve; performing step-by-step smooth approximation processing according to the current actual brightness value ACT (n) and the target brightness value DST (n), and calculating a brightness variation Delta (n); outputting a next actual brightness value ACT (n + 1) = the previous actual brightness value ACT (n) + the brightness variation Delta (n); and outputting a DC-DC driving duty ratio signal to the dimmer according to the next actual brightness value ACT (n + 1), and carrying out dimming processing by the dimmer according to the input DC-DC driving duty ratio signal. According to the method, full-range non-stroboflash can be realized, and thedimming depth can reach
Bibliography:Application Number: CN202010369025