Battery voltage measurement apparatus
First Claim
1. An apparatus for measuring a battery voltage, which divides a plurality of batteries connected in series into a plurality of blocks comprising at least one battery, and measures the voltage of said blocks, comprising:
- a power storage element installed in parallel for each of said blocks;
a voltage detecting circuit for obtaining an output voltage corresponding to the voltage across said power storage element;
a first switching element group comprising a plurality of switching elements, which is inserted between said power storage element and said block for connecting said power storage element and said block in parallel;
a second switching element group comprising a plurality of switching elements, which is inserted between said power storage element and said voltage detecting circuit for connecting said power storage element and said voltage detecting circuit; and
a driver for switching said first switching element group and said second switching element group, for driving all the switching elements belonging to said first switching element group at the same time, and for driving all the switching elements belonging to said second switching element group at the same time;
wherein said driver, after turning said first switching element group on and turning said second switching element group off, when the voltage across said power storage element reaches the same voltage as said blocks, turns said first switching element group off for a predetermined period time so that said first and second switching element groups are turned off for the predetermined period of time, and then turns said second switching element group on.
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Accused Products
Abstract
An apparatus for measuring battery voltage is provided that can detect battery voltage with high accuracy, and also can be miniaturized with cost and noise reduced. The apparatus comprises: a capacitor which is charged to the voltage of each module, switches which connect and disconnect this capacitor and the module, a voltage follower which outputs the voltage across the capacitor, and switches which connect and disconnect the voltage follower and the capacitor. For the aforementioned switches, photo MOSFETs are used. Furthermore, to prevent discharge from the capacitor, a voltage follower is installed. Therefore, by using not a complicated circuit but inexpensive and simple elements, a low cost and miniaturized apparatus for measuring battery voltage is realized.
31 Citations
6 Claims
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1. An apparatus for measuring a battery voltage, which divides a plurality of batteries connected in series into a plurality of blocks comprising at least one battery, and measures the voltage of said blocks, comprising:
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a power storage element installed in parallel for each of said blocks;
a voltage detecting circuit for obtaining an output voltage corresponding to the voltage across said power storage element;
a first switching element group comprising a plurality of switching elements, which is inserted between said power storage element and said block for connecting said power storage element and said block in parallel;
a second switching element group comprising a plurality of switching elements, which is inserted between said power storage element and said voltage detecting circuit for connecting said power storage element and said voltage detecting circuit; and
a driver for switching said first switching element group and said second switching element group, for driving all the switching elements belonging to said first switching element group at the same time, and for driving all the switching elements belonging to said second switching element group at the same time;
wherein said driver, after turning said first switching element group on and turning said second switching element group off, when the voltage across said power storage element reaches the same voltage as said blocks, turns said first switching element group off for a predetermined period time so that said first and second switching element groups are turned off for the predetermined period of time, and then turns said second switching element group on. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification