Abstract: An apparatus and method for supplying alternating current power to electrical devices wherein a subpanel having a plurality of switches allows a user to preset selected electrical devices for either automatic or manual load pick up by a battery during a utility power loss. Battery power is supplied only to predetermined electrical devices so as to avoid overload of the battery.

Abstract: A power supply system for a sump pump including a transformerless inverter circuit with a plurality of MOSFET transistors for powering the pump using either available utility-supplied power or stored power from a battery.

Abstract: A self-contained power control module for controlling power to the peripheral output devices of an electronic data processing system. The power control module automatically interrupts power to the peripheral output devices of the system after a predetermined interval has elapsed without detection of data input, and restores power to the peripheral output devices upon detection of data input. A pulse detection circuit, connected to the peripheral input devices, monitors the peripheral input devices for data pulses. A timing module, connected to the pulse detection circuit, is reset upon the detection of a data pulse. After a predetermined interval has elapsed without detection of a data pulse, the timing module outputs a control signal to two switches. A power switch, disposed between the power supply and the peripheral output device, controls power to the peripheral output device in response to the control signal from the timing module.

Abstract: An insulated dock plate cover is provided which is connected to the door and thus moves automatically to raised and lowered positions as the door is opened and closed. The forward end of the dock plate cover is connected directly to the lower end of the door while the rear end of the cover is connected by cables which are operatively connected to the conventional door cables in turn connected to a motorized overhead drive shaft.