The New Modular Soft-switching 115v/400hz Power Inverter Design

The present status, development trend, and foundation for Aeronautical Static Inverter (ASI) are presented.Its foundation is soft-switching techniques of single-stage DC/DC converters , and single-stage DC/AC inverters with high power density and high efficiency. A prototype for 115V/400Hz inverter by using a novel combined PWM soft-switching technique is designedoThis cascade circuit topology is constituted of a PS-ZVZCS PWM DC/DC converter and a DC/AC inverter. It has the merits such as simple topology, small bulk, lower weight and high efficiency, It also isolated the DC/DC converter and the DC/AC inverter.The DC/DC converter and DC/AC inverter have its separate close loop control circuit, the voltage-mode control strategy is introduced in the ZVZCS PWM DC/DC conerter, and the three states discrete pulse modulation(DPM) hysteresis current control strategy is introduced in the DC/AC inverter.This novel topology is verified by the test result.As a result of this novel topology, power transistors' soft-switching in ASI with high-voltage DC(270V) input was realized, which of course turn the ASI' high frequency, miniaturization and high efficency into true.