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A novel QRDCL circuit for zero voltage switched inverter

This paper presents an alternate quasi-resonant dc link (QRDCL) circuit for soft switched inverters which does not require paralleling of a charged capacitor with another charged capacitor or a voltage source. The circuit momentarily pulls down the DC link voltage to zero as commanded by the control circuit to facilitate zero voltage switching (ZVS) of inverter devices. Operation of this circuit is independent of load current. The circuit is snubberless and offers true PWM capability. The paper covers description of the circuit, operating principles, detailed analysis of various modes and design considerations. Feasibility and operating principles of the circuit have been verified by simulation using PSPICE.