Isolated high-efficiency PWM dimming LED drive circuit

The utility model discloses an isolated high-efficiency PWM light modulation LED drive circuit. The LED dimming circuit comprises a QR Flyback power conversion and control circuit, an LED lamp, a photoelectric coupler OP1, a voltage and current detection control circuit and a dimming signal conversi...

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Bibliographische Detailangaben
Hauptverfasser:	YANG QINGFENG, FANG JIEMIAO, WANG CHAN, LONG LIQUAN
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	ELECTRIC HEATING ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY
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Beschreibung
Zusammenfassung:	The utility model discloses an isolated high-efficiency PWM light modulation LED drive circuit. The LED dimming circuit comprises a QR Flyback power conversion and control circuit, an LED lamp, a photoelectric coupler OP1, a voltage and current detection control circuit and a dimming signal conversion control circuit, the VOUT end of the QR Flyback power conversion and control circuit is electrically connected with the positive end of the LED lamp and the VS end of the voltage and current detection control circuit. The SGND end of the QR Flyback power conversion and control circuit is electrically connected with the negative end of the LED lamp and the CS end of the voltage and current detection control circuit through a resistor RS. The VPWM end of the voltage and current detection control circuit is electrically connected with the VPWM end of the dimming signal conversion control circuit, and the SVCC end of the voltage and current detection control circuit is electrically connectedwith the SVCC end of the