BATTERY VOLTAGE DETECTOR CIRCUIT
First Claim
1. A battery voltage detector circuit adapted to monitor the voltages of a plurality of batteries connected in series, comprising:
- a flying capacitor;
a multiplexer switch that sequentially connects the flying capacitor to the plurality of batteries;
a voltage detecting unit that detects the voltage of the flying capacitor;
a first reference potential connecting unit connected to one terminal of the flying capacitor;
a second reference potential connecting unit connected to the other terminal of the flying capacitor; and
a control circuit that controls the multiplexer switch, the first reference potential connecting unit, and the second reference potential connecting unit.
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Accused Products
Abstract
There is provided a battery voltage detector circuit which uses a multiplexer system and which is capable of reducing the influence of the deviation of a detected voltage attributable to a parasitic capacitance, thus improving the accuracy of voltage detection. The battery voltage detector circuit that monitors the voltages of a plurality of batteries connected in series includes a flying capacitor, a multiplexer switch that sequentially connects the flying capacitor to the plurality of batteries, a voltage detecting unit that detects the voltage of the flying capacitor, a first reference potential detecting unit connected to one terminal of the flying capacitor, a second reference potential connecting unit connected to the other terminal of the flying capacitor, and a control circuit that controls the multiplexer switch, the first reference potential connecting unit and the second reference potential connecting unit.
15 Citations
3 Claims
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1. A battery voltage detector circuit adapted to monitor the voltages of a plurality of batteries connected in series, comprising:
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a flying capacitor; a multiplexer switch that sequentially connects the flying capacitor to the plurality of batteries; a voltage detecting unit that detects the voltage of the flying capacitor; a first reference potential connecting unit connected to one terminal of the flying capacitor; a second reference potential connecting unit connected to the other terminal of the flying capacitor; and a control circuit that controls the multiplexer switch, the first reference potential connecting unit, and the second reference potential connecting unit. - View Dependent Claims (2, 3)
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Specification