Battery monitoring circuit and battery monitoring system
First Claim
1. A battery monitoring circuit that monitors voltages of n (n≧
- 2) 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 (n+1)-th switch element connected to a (n+1)-th terminal at a first end and to the second end of the first switch element at a second end, the (n+1)-th terminal being connected to a ground and intended to be connected to a negative pole of a n-th 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 (n+1)-th 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 n (n≧
- 2) 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 (n+1)-th switch element connected to a (n+1)-th terminal at a first end and to the second end of the first switch element at a second end, the (n+1)-th terminal being connected to a ground and intended to be connected to a negative pole of a n-th 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 (n+1)-th 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)
- 2) secondary batteries connected in series with each other, comprising;
-
13. A battery monitoring circuit that monitors voltages of n (n≧
- 2) 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, 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 (n+1)-th switch element connected to a (n+1)-th terminal at a first end and to the second end of the first switch element at a second end, the (n+1)-th terminal being connected to a ground and intended to be connected to a negative pole of a n-th 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 (n+1)-th switch elements and the first to fifth output controlling switch element and controls operation of the AD converter. - View Dependent Claims (14)
- 2) secondary batteries connected in series with each other, comprising;
-
16. A battery monitoring system that monitors voltages of n (n≧
- 2) secondary batteries connected in series with each other, comprising;
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 (n+1)-th switch element connected to a (n+1)-th terminal at a first end and to the second end of the first switch element at a second end, the (n+1)-th terminal being connected to a ground and intended to be connected to a negative pole of a n-th 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 (n+1)-th switch elements and the first output controlling switch element and controls operation of the AD converter. - View Dependent Claims (17, 18, 19, 20)
- 2) secondary batteries connected in series with each other, comprising;
Specification