Patent ID: 7622818

Claim:
A backup electrical supply system for an aircraft having a power supply, and an electrically controllable switch adapted to communicate electrical energy from the power supply to one or more electrical loads, comprising: a. A user-operable switch having a first terminal in electrical communication with the power supply, and having a second terminal; b. A first directional current control device having first and second terminals, adapted to permit electrical energy to pass from the first terminal to the second terminal but substantially prevent electrical energy from passing from the second terminal to the first terminal, with the first termination in electrical communication with the second terminal of the user-operable switch; c. A second directional current control device having first and second terminals, adapted to permit electrical energy to pass from the first terminal to the second terminal but substantially prevent electrical energy from passing from the second terminal to the first terminal, with the first termination in electrical communication with an output of the electrically controllable switch, and the second terminal in electrical communication with the second terminal of the first directional current control device; d. Wherein second terminals of the first and second directional current control devices can be placed in electrical communication with one or more electrical loads.