Switching method for main power switch of inverter system, involves two intermediating voltage converter unit, each intermediate voltage circuits have precharging device, which are linked with auxiliary voltage source

摘要

The method involves two intermediating voltage converter unit (4,6,8), each intermediate voltage circuits have a precharging device (16), which are linked with an auxiliary voltage source. An intermediate circuit voltage of converter units is regulated on a predetermined threshold value. A main power switch-switching signal generation and an intermediate circuit voltage have reached a specified threshold value. A switching main power switch of the converter device, as each intermediate voltage circuit converter units generates a main power switch-switching signal.