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1. (WO2018040132) NON-ISOLATED SWITCHED POWER SUPPLY FOR HIGH VOLTAGE LED STRIP

Pub. No.:    WO/2018/040132    International Application No.:    PCT/CN2016/099034
Publication Date: Fri Mar 09 00:59:59 CET 2018 International Filing Date: Thu Sep 15 01:59:59 CEST 2016
IPC: H02M 3/335
Applicants: GUANGDONG OML TECHNOLOGY CO., LTD.
广东欧曼科技股份有限公司
Inventors: ZHANG, Peiliang
张培良
Title: NON-ISOLATED SWITCHED POWER SUPPLY FOR HIGH VOLTAGE LED STRIP
Abstract:
A non-isolated switched power supply for a high voltage LED strip comprises: a full-bridge rectifier circuit (10), a switch Q2, an electrolytic capacitor C2, an energy storage inductor L1, a diode D4, and a PWM circuit (90). A PWM signal output terminal of the PWM circuit (90) is connected to a control electrode of the switch Q2. The switch Q2 and the diode D4 are connected in series between two output terminals of the full-bridge rectifier circuit (10), and a negative terminal of the diode D4 is connected to the positive output terminal +VCC of the full-bridge rectifier circuit (10). The energy storage inductor L1 is connected between a negative terminal of the electrolytic capacitor C2 and a positive terminal of the diode D4. The non-isolated switched power supply uses a new circuit structure and modulates the voltage of the energy storage inductor L1 to be maintained at 130 V via the pulse width of the PWM circuit (90), such that the electrolytic capacitor C1 can always output a high voltage of 180 V, and the cost of the power supply is low, which can make a high voltage LED strip manufacturer more competitive.