Patent ID: 6727602
Filing Date: 2004-04-27
Classification: H02J,H02M

Abstract:
A power supply for providing charge to a load from a first battery and a second battery, comprising:a first power switch coupled to the first battery and the load; a second power switch coupled to the second battery and the load; and a power controller coupled to said first power switch, said second power switch, and the load, said power controller providing charge from the first battery to the load by closing said first power switch and providing charge from the second battery to the load by closing said second power switch; wherein said power controller monitors a load voltage on the load and causes an increased charge to be supplied to the load when said load voltage is less than a predetermined voltage by increasing the amount of time that at least one of said first power switch or said second power switch is closed, and wherein said power controller controls said first and second power switch to open and close in an alternating fashion, thereby supplying charge to the load from only one battery at a time.