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Unified design for ZVT PWM converters with resonant auxiliary circuit

Unified design for ZVT PWM converters with resonant auxiliary circuit

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Operation modes of zero-voltage transition (ZVT) PWM converters with resonant auxiliary circuit (RAC) are identified and analysed by means of a common topology. A novel state-plane approach is used to determine the soft-switching boundary for this sort of converter. A unified design criterion, based on the analytical definition of the soft-switching boundary, is described in detail. By means of the proposed criterion the time spent on repetitive numerical simulation of a given topology to define its design guidelines based on a set of particular features can be significantly reduced. The theoretical analysis is confirmed by means of experimental results obtained from ZVT-PWM boost converters, which operate at 1 kW, 100 kHz.

Inspec keywords: PWM power convertors; switching convertors; resonant power convertors; DC-DC power convertors

Other keywords: soft-switching boundary; numerical simulation; 100 kHz; ZVT PWM boost converter; state-plane approach; 1 kW; resonant auxiliary circuit; zero-voltage transition converters; unified design criterion

Subjects: Differential equations (numerical analysis)

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