A three-phase soft-switching converter with high power factor

A new PWM converter based on soft-switching is introduced. The converter uses a minimum number of devices, and requires less switching operations than conventional techniques. Switching is realized solely in a ZVS mode, therefore the loss is reduced and EMI (Electromagnetic Interference) suppressed. The paper analyzes the operation of ZVS (Zero Voltage Switching), discusses method; for maintaining a unit power factor and constant DC voltage. Changing the modulation index M and the phase angle theta keeps the input current in phase with the voltage. It also keeps the current sinusoidal, and ensures a constant output voltage.