Experimental Verification of MHz Inverter Constructed from Frequency Multiplying Circuit with Soft-Switching

Abstract:
This paper discusses a verification of an inverter outputs MHz frequency without fastswitching semiconductor switches. The proposed inverter consists of a multi-phase inverter using silicon switching devices and multi-core transformers. By the frequency multiplying, the proposed circuit can output high frequency over the switching frequency. Moreover, the series resonance using a leakage inductance of the multi-core transformers and a resonant capacitor is applied in order to achieve sinusoidal output voltage. A prototype circuit is experimentally verified and theoretically analyzed in terms of soft-switching. As a result, it is confirmed the prototype circuit can output sinusoidal output voltage of 2.5 MHz with the switching frequency of 500 kHz. In addition, a required dead time for zero voltage switching is theoretically analyzed and experimentally verified using a prototype circuit.