Patent ID: 6597073
Filing Date: 2003-07-22
Classification: G06F

Abstract:
A circuit comprising:a first switch for coupling a first power supply to a first load when said first power supply is functioning, the first switch comprising a first transistor coupled to the first power supply and a second transistor coupled to the first transistor and the first load; a second switch for coupling a second power supply to a second load when said second power supply is functioning, the second switch comprising a third transistor coupled to the second power supply and a fourth transistor coupled to the third transistor and the second load; a third switch for coupling the second power supply to the first load when the first power supply fails, the third switch comprising a fifth transistor coupled to the second power supply and a sixth transistor coupled to the fifth transistor and the first load; a fourth switch for coupling the first power supply to the second load when the second power supply fails, the fourth switch comprising a seventh transistor coupled to the first power supply and an eighth transistor coupled to the seventh transistor and the second load; a voltage sensor coupled to the first power supply, the voltage sensor adapted to detect a malfunction of the first power supply by comparing a voltage between the first power supply and the first switch to a pre-defined static voltage threshold; and a glitch protector coupled to the first load, to the second transistor, and to the fourth transistor, the glitch protector configured to maintain substantially constant voltage to the first load during the transition of the power supplies.