An Improved Single-Phase Zero-Voltage Transition Soft-Switching Inverter with a Subtractive Coupled Inductor Auxiliary Circuit

An improved single-phase zero-voltage transition soft- switching inverter with a subtractive coupled inductor auxiliary circuit is proposed to provides the zero- voltage switching under an unipolar PWM scheme. The proposed inverter overcomes the several drawbacks of the conventional soft-switching inverter including a bulky capacitor, protection circuit requirement, and/or dc-link voltage fluctuation. Moreover, the proposed topology is possible to reduce components by a simple auxiliary resonant circuitry, and thus achieves a low cost and small volume. Together with the detail operational principle, the design consideration is provided for an optimal efficiency achievement. Finally, several simulation results provides to verify the effectiveness of the proposed soft-switching inverter and its design consideration under several conditions.