Patent ID: 6922087
Filing Date: 2005-07-26
Classification: G05B,H02J,Y02B,Y04S

Abstract:
1. A control arrangement for a source-transfer switching system of the type that includes first and second solid-state switches having respective first and second control inputs, input source connections and output connections, the output connections being connected to a common load circuit connection, the control arrangement comprising: transfer control means for controlling the first and second solid-state switches via the first and second control inputs so as to selectively supply the common load circuit connection via either the first or second solid-state switch; first means for sensing one or more improper electrical operating conditions of each of the first and second solid-state switches; and second means responsive to a detected improper electrical operating condition of the first or second solid state switch supplying the common load circuit for initiating a transfer to the other of the first or second solid state switch, said first and second solid-state switches comprising a plurality of series-connected stages, said first means comprising means for sensing said one or more improper operating conditions for each stage of the first and second solid-state switches, a first of said one or more improper operating conditions is the shorted condition of each stage of the first and second solid-state switches, the shorted condition of each stage of the first and second solid-state switches being determined based on a representation of the voltage across each stage of the first and second solid-state switches.