Patent ID: 6476587
Filing Date: 2002-11-05
Classification: H02J

Abstract:
A power circuit comprising:a chemical cell used to store a predetermined amount of energy, to produce electromotive force based on said energy and to feed said electromotive force to a load; a capacitor which is charged by said electromotive force produced by said chemical cell and accumulates electric power and applies said accumulated electric power to said load; a control section; and wherein said control section, when a voltage of said capacitor is higher than a first reference value and when a load current flowing through said load is smaller than a second reference value, applies a voltage produced by said chemical cell to said capacitor from said chemical cell to charge said capacitor and, at a same time, feeds said electromotive force produced by said chemical cell and said accumulated electric power in said capacitor to said load and, when said load current is larger than said second reference value, feeds only said electric power accumulated in said capacitor to said load and, when a voltage of said capacitor is lower than said first reference value and said load current flowing through said load is smaller than said second reference value, applies a current whose level is limited to a predetermined level to said capacitor from said chemical cell to charge said capacitor and feeds said electromotive force produced by said chemical cell to said load.