Patent ID: 6465913
Filing Date: 2002-10-15
Classification: H02J

Abstract:
A power source unit which is arranged between a commercially available power source and an electronic apparatus having a secondary battery therein and supplies an output voltage to said electronic apparatus, comprising:voltage converting means for converting a voltage of the commercially available power source into a predetermined regulated DC voltage which is necessary for the electronic apparatus; a battery unit constructed by a plurality of secondary batteries; first switching means which is inserted between said voltage converting means and said battery unit; second switching means which is inserted between said voltage converting means and a power output terminal; control means for turning off said second switching means when said first switching means is ON and turning off said first switching means when said second switching means is ON; second voltage converting means for converting a voltage of said battery unit into a predetermined regulated DC voltage which is necessary for said electronic apparatus; and second control means for making said second voltage converting means inoperative when said voltage converting means is operating.