Patent ID: 7750496
Filing Date: 2010-07-06
Classification: H02J

Abstract:
1. A power supply unit for use with an aircraft power bus, comprising: a connection circuit being electrically coupled to the aircraft power bus and providing the power supply unit with both charge and discharge paths; an energy storage circuit being electrically coupled to the connection circuit, wherein during charging periods the energy storage circuit receives charge from the aircraft power bus through the charge path, and during discharging periods the energy storage circuit provides charge to the aircraft power bus through the discharge path; a comparator circuit that is electrically coupled to the energy storage circuit and that determines if there is adequate voltage on the aircraft power bus; and a time delay circuit that is electrically coupled to the comparator circuit and that, in response to a determination by the comparator circuit that there is inadequate voltage on the aircraft power bus, distinguishes when a loss of power on the aircraft power bus is due to a temporary disruption and when it is due to a desired shut down.