BATTERY MONITORING CIRCUIT AND BATTERY MONITORING SYSTEM
First Claim
1. A battery monitoring circuit that monitors voltages of a plurality of secondary batteries connected in series with each other, comprising:
- a first switch element connected to a first terminal at a first end, the first terminal being intended to be connected to a positive pole of a first secondary battery;
a second switch element connected to a second terminal at a first end and to a second end of the first switch element at a second end, the second terminal being intended to be connected to a negative pole of the first secondary battery and a positive pole of a second secondary battery;
a third switch element connected to a third terminal at a first end and to the second end of the first switch element at a second end, the third terminal being connected to a ground and intended to be connected to a negative pole of the second secondary battery;
a first output capacitor connected to the second end of the first switch element at a first end;
a first output controlling switch element connected between a second end of the first output capacitor and the ground;
an AD converter that analog-to-digital converts a signal responsive to a voltage at an output terminal between the second end of the first output capacitor and the first output controlling switch element and outputs the resulting digital signal; and
a controlling circuit that controls turning on and off of the first to third switch elements and the first output controlling switch element and controls operation of the AD converter.
1 Assignment
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Accused Products
Abstract
The battery monitoring circuit includes a first switch element, a second switch element, a third switch element. The battery monitoring circuit includes a first output capacitor connected to the second end of the first switch element at a first end. The battery monitoring circuit includes a first output controlling switch element connected between a second end of the first output capacitor and the ground. The battery monitoring circuit includes an AD converter that analog-to-digital converts a signal responsive to a voltage at an output terminal between the second end of the first output capacitor and the first output controlling switch element. The battery monitoring circuit includes a controlling circuit that controls turning the first to third switch elements and the first output controlling switch element and controls the AD converter.
13 Citations
20 Claims
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1. A battery monitoring circuit that monitors voltages of a plurality of secondary batteries connected in series with each other, comprising:
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a first switch element connected to a first terminal at a first end, the first terminal being intended to be connected to a positive pole of a first secondary battery; a second switch element connected to a second terminal at a first end and to a second end of the first switch element at a second end, the second terminal being intended to be connected to a negative pole of the first secondary battery and a positive pole of a second secondary battery; a third switch element connected to a third terminal at a first end and to the second end of the first switch element at a second end, the third terminal being connected to a ground and intended to be connected to a negative pole of the second secondary battery; a first output capacitor connected to the second end of the first switch element at a first end; a first output controlling switch element connected between a second end of the first output capacitor and the ground; an AD converter that analog-to-digital converts a signal responsive to a voltage at an output terminal between the second end of the first output capacitor and the first output controlling switch element and outputs the resulting digital signal; and a controlling circuit that controls turning on and off of the first to third switch elements and the first output controlling switch element and controls operation of the AD converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 15)
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13. A battery monitoring circuit that monitors voltages of a plurality of secondary batteries connected in series with each other, comprising:
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a first switch element connected to a first terminal at a first end, the first terminal being intended to be connected to a positive pole of a first secondary battery; a second switch element connected to a second terminal at a first end, the second terminal being intended to be connected to a negative pole of the first secondary battery and a positive pole of a second secondary battery; a third switch element connected to a third terminal at a first end and to the second end of the first switch element at a second end, the third terminal being connected to a ground and intended to be connected to a negative pole of the second secondary battery; a first output capacitor connected to the second end of the first switch element at a first end; a second output capacitor connected to the second end of the second switch element at a first end; a first output controlling switch element connected between a second end of the first output capacitor and the ground; a second output controlling switch element connected between a second end of the second output capacitor and the ground; a third output controlling switch element connected between the first end of the first output capacitor and the first end of the second output capacitor; a fourth output controlling switch element connected between the second end of the first output capacitor and an output terminal; a fifth output controlling switch element connected between the second end of the second output capacitor and the output terminal; an AD converter that analog-to-digital converts a signal responsive to a voltage at the output terminal between and outputs the resulting digital signal; and a controlling circuit that controls turning on and off of the first to third switch elements and the first to fifth output controlling switch element and controls operation of the AD converter. - View Dependent Claims (14)
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16. A battery monitoring system that monitors voltages of a plurality of secondary batteries connected in series with each other, comprising:
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a battery monitoring circuit that monitors voltages of a first secondary battery and a second secondary battery connected in series with the first secondary battery; and a microcomputer that controls the battery monitoring circuit based on measured voltages of the first and second secondary batteries, wherein the battery monitoring circuit comprising; a first switch element connected to a first terminal at a first end, the first terminal being intended to be connected to a positive pole of a first secondary battery; a second switch element connected to a second terminal at a first end and to a second end of the first switch element at a second end, the second terminal being intended to be connected to a negative pole of the first secondary battery and a positive pole of a second secondary battery; a third switch element connected to a third terminal at a first end and to the second end of the first switch element at a second end, the third terminal being connected to a ground and intended to be connected to a negative pole of the second secondary battery; a first output capacitor connected to the second end of the first switch element at a first end; a first output controlling switch element connected between a second end of the first output capacitor and the ground; an AD converter that analog-to-digital converts a signal responsive to a voltage at an output terminal between the second end of the first output capacitor and the first output controlling switch element and outputs the resulting digital signal; and a controlling circuit that controls turning on and off of the first to third switch elements and the first output controlling switch element and controls operation of the AD converter. - View Dependent Claims (17, 18, 19, 20)
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Specification