| 20110057598 | Current Control Apparatus Operable In Wet Environment - An apparatus operable in a wet environment for controlling the flow of electrical current to an electrical load, includes a pair of input terminals for connection to an AC mains supply; a pair of output terminals for connection to an electric motor and connected in a full power mode to the pair of input terminals; a voltage doubler circuit including a pair of diodes; a pair of direct current switching elements connected between the respective diodes and a common point; a controller; an interface connected to the controller for receiving external status signals; a switching arrangement responsive to signals from the controller to select the full power mode or a controlled power mode, and wherein in the controlled power mode the switching arrangement connects one of the output terminals to the common point so that AC output voltage is supplied to the electric motor through the switching elements. The controller is responsive to the external status signals to control the switching arrangement between the controlled mode and the full power mode, and in the controlled power mode to switch the switching elements in a predetermined sequence such that only one said direct current switching element conducts current during any one half cycle of AC output voltage applied to the electric motor. | 03-10-2011 |
