Low stand by power, self oscillating power supply

Self oscillating current fed push pull resonant inverters can be controlled without using special drivers. Dc current flows through the choke coil and the power switches, although the driving signals of the power switches are sinusoidal. When the base current is near zero, the transistors cannot be operated in switching mode. Hence higher switching power losses and instantaneous peak power during off transitions are observed. In this study, an alternative design has been proposed to overcome this problem. A prototype circuit has been built which provides dc bias current to the base of the transistors. Experimental results are compared with theoretical calculations to demonstrate the validity of the design. The proposed design decreases the peak and average power losses by about 8 times, when compared to conventional designs.

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Low stand by power, self oscillating power supply

Abstract: A design has been made of a low stand by power oscillator, which can be used off a rectified 230V grid. Stand by powers lower than 0.2W are obtained. The oscillating mode is obtained using the capacitance of the power MOSFET. The supply operates at a wide input voltage range

Cited by 3 publications

References 4 publications

A loss-adaptive self-oscillating buck converter for LED driving

A loss-adaptive self-oscillating buck converter for LED driving

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