Patent ID: 6020719
Filing Date: 2000-02-01
Classification: H02J,Y02E

Abstract:
A secondary battery unit for converting a first voltage to a predetermined second voltage and outputting the second voltage from an output terminal, the first voltage being a terminal voltage of an electric double layer condenser which is previously charged to have a predetermined voltage by using a detachable charge circuit, the unit comprising:plural inductors having different inductances, to which the first voltage is input;rectifying means inserted between the plural inductors and the output terminal;plural switching means respectively connected to the plural inductors, each switching means making current according to the first voltage flow through the connected inductor when the switching means is operated;switching control means for selectively operating one of the plural switching means according to variation of the first voltage; anda control circuit for controlling timing of the above switching between the plural switching means so as to stabilize a voltage from the output terminal to the predetermined second voltage.