High-efficiency of MHz inverter constructed from frequency multiplying circuit

This paper discusses a verification of an inverter outputs MHz frequency which is over the switching frequency. The proposed inverter consists of a multi-phase inverter using silicon switching devices and multi-core transformers. By the frequency multiplying, high switching frequency compared with the output frequency is not required. 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 zero voltage switching (ZVS). As a result, it is confirmed that 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 the prototype circuit.