Zero-voltage switched resonant and PWM converters : design-oriented analysis and performance evaluation
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The analysis for the resonant converters uses the fundamental approximation which is verified by comparison with the existing exact analysis for the series resonant converter (SRC), the parallel resonant converter (pRe) and the LCC resonant converter (LCC-RC). Comparison of design examples shows a superior performance for the LCC-RC, and less circulating current for the conventional variable-frequency resonant converters than for the phase-shifted control version. Experimental verification is provided for the phase-shifted resonant converters.
The effect of switch capacitance on the zero-voltage switching (ZVS) of resonant converters is studied for the SRC, PRC and LCC-RC. The effect of switch capacitance is more' pronounced for low Q designs. Consequently, it is of primary importance for the LCC-RC whose optimal design requires low Q values. The results have been verified experimentally in an LCC-RC prototype.
A complete analysis and design procedure are provided for the new ZVS-FB-PWM converter, including a new active clamp circuit that completely eliminates the ringing in the I rectifiers. The design procedure and design considerations have been verified with three' experimental prototypes.
The comparison of the resonant converters with the ZVS-FB-PWM converter based on the reactive power required for ZVS, shows that the ZVS-FB-PWM converter is a superior alternative to resonant converters. The ZVS-FB-PWM converter always has less circulating current than the resonant converters when it is designed for a limited ZVS range.
- Doctoral Dissertations