Low-power LED switching power supply

The utility model discloses a low-power LED switching power supply which comprises a rectifier filter circuit consisting of a diode bridge rectifier circuit, an inductor L1 and a capacitor C1, and an output rectifier filter circuit; the output end of the rectifier filter circuit is connected with a...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	XIE WEISEN
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRIC HEATING ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	The utility model discloses a low-power LED switching power supply which comprises a rectifier filter circuit consisting of a diode bridge rectifier circuit, an inductor L1 and a capacitor C1, and an output rectifier filter circuit; the output end of the rectifier filter circuit is connected with a resistor R1, the resistor R1 and a resistor R2 are connected parallelly, the R2 is connected with a U1 rectifier filter circuit consisting of a capacitor C2, a resistor R3 and a diode D2; a switch tube Q1 is connected with a diode D1; an SW pin of an integrated circuit U1 is connected with the switch tube Q1, and a RB pin is connected between a feedback voltage sampling circuit consisting of a resistor R4 and a resistor R5; a high-frequency transformer is connected with the switch tube Q1 and the feedback voltage sampling circuit. The low-power LED switching power supply adopts a primary feedback technology and a secondary voltage current short-circuit over-temperature control circuit so that the output voltage cur