Voltage monitoring module and voltage monitoring system which compares voltages to determine leakage
First Claim
Patent Images
1. A voltage monitoring module comprising:
- a first input terminal coupled to a high-voltage-side terminal of a battery cell through a first path including an external resistor;
a first terminal coupled to the high-voltage-side terminal of the battery cell through a second path;
a first switch coupled to the first input terminal;
a second switch coupled to the first terminal;
a second input terminal and a second terminal coupled to a low-voltage-side terminal of the battery cell;
a third switch that is coupled to the second input terminal;
a fourth switch that is coupled to the second terminal; and
a control circuit that controls ON/OFF of the first through fourth switches, whereinan element that suppresses fluctuation of a voltage input to the first switch through the first input terminal that is coupled between the first switch and a fixed voltage, andthe control circuit controls the first through the fourth switches, such that a plurality of potential differences between the first path and the second path are compared between points among the first input terminal, second input terminal, first terminal, second terminal, and first through fourth switches to determine a current leak.
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Abstract
The voltage monitoring module includes an input terminal, a cell balancing input terminal, a switch, and a control circuit. The input terminal is coupled to a high-voltage-side terminal of a battery cell through a filter resistor. The cell balancing input terminal is coupled to the high-voltage-side terminal of the battery cell. The switch is coupled to the input terminal. The control circuit- controls ON/OFF of the switch. A filter resistor is coupled between the switch and a ground. The control circuit turns on the switch, so that a high-voltage-side voltage is compared with a low-voltage-side voltage.
79 Citations
20 Claims
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1. A voltage monitoring module comprising:
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a first input terminal coupled to a high-voltage-side terminal of a battery cell through a first path including an external resistor; a first terminal coupled to the high-voltage-side terminal of the battery cell through a second path; a first switch coupled to the first input terminal; a second switch coupled to the first terminal; a second input terminal and a second terminal coupled to a low-voltage-side terminal of the battery cell; a third switch that is coupled to the second input terminal; a fourth switch that is coupled to the second terminal; and a control circuit that controls ON/OFF of the first through fourth switches, wherein an element that suppresses fluctuation of a voltage input to the first switch through the first input terminal that is coupled between the first switch and a fixed voltage, and the control circuit controls the first through the fourth switches, such that a plurality of potential differences between the first path and the second path are compared between points among the first input terminal, second input terminal, first terminal, second terminal, and first through fourth switches to determine a current leak. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 14, 16, 17, 19, 20)
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11. A voltage monitoring module comprising:
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a first input terminal coupled to a high-voltage-side terminal of a battery cell through an external resistor; a first terminal coupled to the high-voltage-side terminal of the battery cell; a first switch coupled to the first input terminal; a control circuit that controls ON/OFF of the first switch, wherein an element that suppresses fluctuation of a voltage input to the first switch through the first input terminal that is coupled between the first switch and a fixed voltage, and the control circuit turns on the first switch, so that a first voltage output from the first input terminal through the first switch is compared with a second voltage output from the first terminal; a second switch that is coupled to the first terminal, ON/OFF of the second switch being controlled by the control circuit, wherein the control circuit turns on the first switch and the second switch, so that the first voltage is compared with the second voltage that is output from the first terminal through the second switch; a second input terminal and a second terminal coupled to a low-voltage-side terminal of the battery cell; a third switch coupled to the second input terminal, ON/OFF of the third switch being controlled by the control circuit; and a fourth switch coupled to the second terminal, ON/OFF of the fourth switch being controlled by the control circuit, wherein the control circuit turns on and turns off both the first switch and the third switch, and turns on and turns off both the second switch and the fourth switch, so that a third voltage that is a difference between the first voltage and a voltage output from the second input terminal through the third switch is compared with a fourth voltage that is a difference between the second voltage and a voltage output from the second terminal through the fourth switch. - View Dependent Claims (12, 13)
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15. A voltage monitoring module comprising:
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a first input terminal coupled to a high-voltage-side terminal of a battery cell through an external resistor; a first terminal coupled to the high-voltage-side terminal of the battery cell; a first switch coupled to the first input terminal; a second switch coupled to the first terminal; a second input terminal and a second terminal coupled to a low-voltage-side terminal of the battery cell; a third switch that is coupled to the second input terminal; a fourth switch that is coupled to the second terminal; and a control circuit that controls ON/OFF of the first through fourth switches, wherein an element that suppresses fluctuation of a voltage input to the first switch through the first input terminal that is coupled between the first switch and a fixed voltage, and the control circuit controls the first through the fourth switches, such that a plurality of potential differences are compared between points among the first input terminal, second input terminal, first terminal, second terminal, and first through fourth switches to determine a current leak, wherein the control circuit controls the first through fourth switches, such that a third voltage that is a difference between a first voltage and a voltage output from the second input terminal through the second switch is compared with a fourth voltage that is a difference between a second voltage and a voltage output from the second terminal through the third switch, and wherein the first voltage output is from the first input terminal through the first switch, and the second voltage output is from the first terminal. - View Dependent Claims (18)
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Specification