Abstract: In practice，the parasitic parameters have a non-negligible effect on the performance of inverter

circuit. The influence of the main parasitic parameters on a new type of switched-coupled-inductor quasi-Z-source

inverter was studied. By the reasonable analysis of the influence of the parasitic parameters（parasitic resistance，

leakage inductance，etc.）of the main components in the circuit structure on the performance of the inverter，a

theoretical basis was provided for the design of circuit parameters. Through reasonable selection of components，the effective guidance was provided to improve the performance of the inverter. Finally，related tests were carried

out by a 1 000Wexperimental prototype.

      Key words: quasi-Z-source inverter；loss analysis；parasitic parameters；efficiency analysis