MEASURING APPARATUS FOR RESIDUAL CHARGE OF BATTERY

PURPOSE:To obtain an apparatus for securely measuring the residual charge of a nickel-cadmium battery. CONSTITUTION:An open voltage measuring circuit and a terminal voltage measuring circuit of a nickel-cadmium battery 3 for charging a charge circuit 1 are provided, wherein internal resistance 14 of...

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1. Verfasser: MIIDOKORO NOBUO
Format: Patent
Sprache:eng
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Zusammenfassung:PURPOSE:To obtain an apparatus for securely measuring the residual charge of a nickel-cadmium battery. CONSTITUTION:An open voltage measuring circuit and a terminal voltage measuring circuit of a nickel-cadmium battery 3 for charging a charge circuit 1 are provided, wherein internal resistance 14 of the nickel-cadmium battery is measured by voltage difference between the circuits to measure remaining battery capacitance from the value. First, a first relay 2 is opened, a second relay 4 is closed and a third relay 5 is opened, and then open voltage of the battery 3 is digitized to be held in a latch circuit 9. Then the relay 5 is closed to digitally convert the terminal voltage of the battery 3. The open voltage from the latch circuit 9 and terminal voltage from an A/D-converter 7 are subjected to subtraction in a subtracting circuit 10, and the residual charge of the battery is displayed by a display circuit 12 with battery internal resistance obtained based on the above subtraction.