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This paper presents a new tuningloop for three-phase current source parallel resonant inverters. The switching frequency is tuned by using a phase-locked loop (PLL) circuit based on a new Phase Detector (PD). In practice, the resonant capacitors and inductors have tolerances that cause different resonant frequency for each phase. This paper shows that a conventional PDcauseshigher voltage stress over switches and DC-link inductor. In the proposed tuning loop, the PLL tracks the average value of the resonant frequencies that reduces the voltage stress. In addition, there is no feedback from the loadcurrents to detect the phase error, which is another advantage of the new method. A laboratory prototype of a three-phase current source parallel resonant half-bridge inverter was built to verify the advantages of the proposed tuning system with operating frequency of 22 kHz.

New Resonant Inverter Tuning for Three-Phase Current Source Parallel Resonant Inverters