VOLTAGE DETECTION CIRCUIT
First Claim
Patent Images
1. A voltage detection circuit for a secondary battery, the voltage detection circuit comprising:
- a main capacitor connected to both terminals of the secondary battery via an input side sampling switch, the main capacitor being charged by the secondary battery; and
a differential amplifier circuit connected to the main capacitor via an output side sampling switch, whereinan output terminal and an inverting input terminal of the differential amplifier circuit are connected via only a sub-capacitor.
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Abstract
A voltage detection circuit for a secondary battery. A secondary battery is composed of a plurality of battery blocks (B1) to (B3), and is connected to a flying capacitor (C1) via input side sampling switches (SW1) to (SW3). The flying capacitor (C1) is connected to a differential amplifier circuit (10) via output side sampling switches (SWa) and (SWb). A feedback capacitor (C2) is connected to an inverting input terminal of the differential amplifier circuit (10) to form an integrator circuit, which reduces the capacitance of the flying capacitor (C1).
17 Citations
13 Claims
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1. A voltage detection circuit for a secondary battery, the voltage detection circuit comprising:
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a main capacitor connected to both terminals of the secondary battery via an input side sampling switch, the main capacitor being charged by the secondary battery; and a differential amplifier circuit connected to the main capacitor via an output side sampling switch, wherein an output terminal and an inverting input terminal of the differential amplifier circuit are connected via only a sub-capacitor. - View Dependent Claims (3, 4, 5, 6)
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2. A voltage detection circuit for a secondary battery, the voltage detection circuit comprising:
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a main capacitor connected to both terminals of the secondary battery via an input side sampling switch, the main capacitor being charged by the secondary battery; and a differential amplifier circuit connected to the main capacitor via an output side sampling switch, wherein an output terminal and an inverting input terminal of the differential amplifier circuit are connected via a sub-capacitor, a resistor and a switch are connected in parallel with the sub-capacitor, and after the main capacitor is charged by the secondary battery, a voltage of the secondary battery is detected by turning the input side sampling switch OFF, turning the output side sampling switch ON, and turning the switch connected in parallel with the sub-capacitor OFF. - View Dependent Claims (10, 11, 12, 13)
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7. A voltage detection circuit for a secondary battery, the voltage detection circuit comprising:
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a main capacitor connected to both terminals of the secondary battery via an input side sampling switch, the main capacitor charged by the secondary battery; and a differential amplifier circuit connected to the main capacitor via an output side sampling switch, wherein an output terminal and an inverting input terminal of the differential amplifier circuit are connected via a sub-capacitor, the main capacitor is composed of first and second main capacitors connected to each other in series, the differential amplifier circuit is composed of first and second differential amplifier circuits, a connection node between the first main capacitor and the second main capacitor is set to a reference potential, and is connected to non-inverting input terminals of the first and second differential amplifier circuits, a terminal of the first main capacitor located on a side opposite to the connection node is connected to an inverting input terminal of the first differential amplifier circuit, and a terminal of the second main capacitor located on a side opposite to the connection node is connected to an inverting input terminal of the second differential amplifier circuit, the voltage detection circuit further comprising a circuit for calculating a difference between outputs from the first differential amplifier circuit and the second differential amplifier circuit, and comprising a signal source for superimposing a frequency component on the first differential amplifier circuit and the second differential amplifier circuit, wherein the signal source is a signal source of an electrical leakage detection circuit. - View Dependent Claims (8, 9)
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Specification