Abstract
This paper presents a tightly regulated multi-output isolated converter that employs only an independently regulated synchronous Single-Switched Post-Regulator (SSPR). The proposed converter is a highly accurate single-ended secondary side post-regulator based on a Series Resonant Converter (SRC); furthermore, it has a voltage-doubler characteristic. The proposed post-regulator requires only one auxiliary switch, in contrast with a bulky and expensive non-isolated DC–DC converter. Moreover, the added voltage-doubler can tightly regulate the slave output current. In addition, the voltage-doubler can improve electromagnetic interference characteristics and reduce switching losses arising from the Zero Current Switching (ZCS) operation of all power switches. The validity of the proposed converter is verified using experimental results obtained via a prototype converter applicable to an LED 3D TV power supply.
Highlights
The voltage-doubler can improve electromagnetic interference characteristics and reduce switching losses arising from the Zero Current Switching (ZCS) operation of all power switches
Liquid crystal display (LCD) TVs are witnessing a rapid change in backlighting technology, from cold cathode fluorescent lamps (CCFLs) to LEDs
As internal power supply units are used in most LCD TVs, designing slim systems with high-efficiency power supplies at appropriate costs for the LCD TV consumer market continues to present a formidable challenge for the power electronics industry
Summary
Liquid crystal display (LCD) TVs are witnessing a rapid change in backlighting technology, from cold cathode fluorescent lamps (CCFLs) to LEDs. Manufacturers employ a universal power supply that supports a voltage range of AC90–264 V This allows one power supply design for a specific TV size to be used for a series of models, leading to reduced development costs. This illustrates the circuit for implementing the primary side inverter of the DC-DC stage It has three outputs: voltage power backlight; 12.8 theaudio/T-con; audio/T-con;and and5 5VVtoto power the system. This voltage, and an LED-dimming current controller to regulate the string current This can can adversely affect overall system efficiency. LEDstring string continuous voltages and current tolerances) are continuously changing; a modular power supply solution that is adaptable to such changes can significantly reduce thea design cycle time. An additional benefit of the proposed used to control the LED string currents to further simplify the design. Experimental results are presented to verify the theoretical analysis and effectiveness of the proposed converter
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