System for providing output current for one or multiple LED

• Main Authors: YANG, JI-QING, LI, ZHUO-YAN, FANG, LIE-YI
• Format: Patent
• Language: Chinese; English
• Published: 16.06.2017
• Subjects: 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

The invention provides a system for providing output current for one or multiple LED. The system comprises a switch control assembly, and the switch control assembly is configured to generate control signals according to information related to sensing, demagnetizing, sampling and reference signals and controls ON/OFF of a system power switch by utilizing the control signals. The system power switch is connected to a first diode terminal of a diode and a first inductor terminal of an inductor, the diode comprises a second diode terminal, the inductor further comprises a second inductor terminal, the one or multiple LED and an output capacitor are connected in parallel between a second diode terminal and the second inductor terminal, the sensing signals are generated by sensing current through the system power switch, the demagnetizing signals are generated by sensing the current through the inductor, the sampling signals are generated by sampling the voltage of the second diode terminal, and the reference sign