Quasi-direct three phase AC/AC pulse converter controlling method, involves connecting switch with another switch, and providing total period of active free wheel condition of output stage for recombination of memory load of former switch

摘要

#CMT# #/CMT# The method involves deactivating an electronic switch e.g. power transistor (41), of an input stage (2), where the switch is not closed in a switching condition of the input stage, and interconnecting the switch with another electronic switch e.g. power transistor (43) of the input stage before privation of an active free wheel condition of an output stage (8). The former switch is subjected to a reverse voltage. The total period of the active free wheel condition of the output stage is provided for recombination of memory load of the former switch. #CMT#USE : #/CMT# Used for controlling a quasi-direct three phase AC/AC pulse converter that is utilized for converting a three phase alternating voltage system into a three phase voltage system. #CMT#ADVANTAGE : #/CMT# The method provides the total period of active free wheel condition of the output stage for recombination of the memory load of the electronic switch, thus minimizing parasitic switching loss of the pulse converter and obtaining uniform distribution of the overall loss. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic basic structure of a three phase AC/AC pulse converter system. 2 : Input stage 8 : Output stage 21-23 : Switches 24-27 : Transistors 41, 43 : Power transistors.