Patent ID: 6438429
Filing Date: 2002-08-20
Classification: G06F

Abstract:
In a computer system peripheral device connected to a plurality of power sources including a first power source and a second power source, a circuit for indicating availability of a power source other than said first power source, said circuit comprising:a circuit subassembly coupled to said first power source and said second power source, said circuit subassembly adapted to conduct current from said first power source when power is not available from said second power source and otherwise conduct current from said second power source; a first component coupled to said circuit subassembly, said first component adapted to conduct current when said second power source is available and to not substantially conduct current otherwise; a second component coupled to said circuit subassembly and to said first component, said second component adapted to conduct current when said first component is conducting current and to not substantially conduct current otherwise; and an output lead coupled to said second component, wherein said output lead provides a signal indicating said second power source is available.