Zczvt Inverters With Magnetically Coupled Auxiliary Pole

• Main Author: da Silva Martins, Mário Lúcio
• Publication Date: 2010
• Other Authors: de Oliveira Stein, Carlos Marcelo, Luís Russi, Jumar, Renes Pinheiro, José, Leães Hey, Hélio
• Format: Article
• Language: eng
• Source: Eletrônica de Potência (Online)
• Download full: https://journal.sobraep.org.br/index.php/rep/article/view/627
• topic: inverter; soft switching; Zero-Current Transition; Zero-Voltage Transition

Existing Zero-Current Transition and Zero- Current Zero-Voltage Transition inverters provides favorable switching conditions for IGBT semiconductors increasing significantly the reactive energy of the converter. This situation off-set the benefits accomplished by abovementioned soft-switching techniques. This paper presents a novel family of Zero-Current Zero-Voltage Transition inverters that overcome this problem by using no resonant tank in the auxiliary circuit. It accomplishes the favorable soft-switching conditions with a magnetically coupled auxiliary voltage source which is derived directly from the inverter filter inductor. Theoretical analysis of the inverter operation is presented and it is verified experimentally from a 1kW, 40kHz, laboratory prototype. The obtained experimental results prove the reliability of the proposed family of ZCZVT inverters.