Self-supplied switch circuit for use in pulse width modulated current source rectifier, has snubber circuit and self-powered supply circuit forming series circuit between circuit nodes in parallel with switching device

摘要

The circuit (110) has a snubber circuit (116) with snubber terminals. A self-powered supply circuit (118) includes a supply storage device e.g. capacitor, where an output is coupled with a switch driver power terminal to provide electrical power from the device to a switch driver (114) for operation of the driver. Input terminals are provided where one input terminal is coupled with one circuit node and the other input terminal is coupled with one of the snubber terminals, where the circuits (116, 118) form a series circuit between the nodes in parallel with a switching device (112). An independent claim is also included for a power conversion system comprising a switching system.