Abstract
A new soft switching pulse-width-modulated (PWM) fly back dc/dc converter with a simple auxiliary circuit is proposed. By adding this auxiliary circuit to the conventional pulse width modulation isolated fly back converter, all power semiconductor devices are soft switched. Therefore switches turn-on under ZCS condition and turn off under zero current zero voltage switching (ZCZVS) condition and diode operates at zero current switching (ZCS) turn-on and turn-off. In addition, the proposed converter frequency is constant and has no additional current stress in the main switch in comparison with conventional ones. Simulation and experimental results justify the theoretical analysis.
Highlights
Extended use of electronic devices in human lives caused improvement and development of electronic equipments
Voltage converters were developed simultaneous to fast development of electronic equipment
These feeding sources that have been designed for providing dc voltage and preparing required energy for electronic equipments, are divided in to two groups of linear and switching in terms of the region of transistor function [10]
Summary
Extended use of electronic devices in human lives caused improvement and development of electronic equipments. Linear power sources have high power losses These sources have some disadvantages such as using in low voltage (about 40 volts), low efficiency (between 35 to 50%), large weight and volume (due to large input decreasing transformer and need of large heat meters), but despite of segments function linear region, have advantages as simple design, simple circuits and low output ripple. Transistor in switching sources functions in outage and saturation, so have higher efficiency (68 to 98%) and other advantages as the better flexibility than linear type, can be used as an additive and subtractive voltage, capacity building in higher voltages, and reduce the size and weight of the circuit (due to increased switching frequency).
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