Battery voltage monitoring device using capacitor circuit and switch failure detection circuit
First Claim
1. A voltage monitoring apparatus comprising:
- a capacitor circuit including at least one capacitor;
an input-side switch group that includes a plurality of input-side switches connected to at least one pair of electrode terminals of at least one battery cell, the input-side switch group applying voltage to a pair of terminals of the at least one capacitor;
a voltage detection circuit that includes at least one pair of voltage sensing terminals connected to each of the terminals of the at least one capacitor, the voltage detection circuit detecting a potential difference across the at least one pair of voltage sensing terminals;
an output-side switch group that includes a plurality of output-side switches connected to the terminals of the at least one capacitor, the output-side switch group applying voltage across the terminals of the at least one capacitor to the at least one pair of voltage sensing terminals;
switch control means for controlling each of the plurality of input-side switches and each of the plurality of output-side switches;
failure detecting means for detecting, on the basis of the voltage detected by the voltage detection circuit when one of the output-side switches is turned on, an on-failure of at least one of the remaining output-side switches which should not be turned on;
an impedance circuit that is connected to each of the at least one pair of voltage sensing terminals, the impedance circuit being connected to each of the plurality of output-side switches, connected to the terminals of the at least one capacitor, via the each of the at least one pair of voltage sensing terminals; and
a stabilizing power circuit that is connected to each of the at least one pair of voltage sensing terminals via the impedance circuit and stabilizes voltage of each of the at least one pair of voltage sensing terminals, whereinthe impedance circuit is configured such that a time constant of a circuit configured by the impedance circuit and the at least one capacitor, which are connected to each other via each of the plurality of output-side switches and the each of the at least one pair of voltage sensing terminals, becomes longer than a required detection time that is taken from when a voltage across the terminals of the at least one capacitor is applied to the at least one pair of voltage sensing terminals until when a potential difference between the at least one pair of voltage sensing terminals is detected by the voltage detection circuit,the voltage detection circuit includes a differential amplifier circuit that amplifies and outputs at least one potential difference between the at least one pair of voltage sensing terminals;
the differential amplifier circuit includes at least one pair of input resistors connected to the at least one pair of voltage sensing terminals; and
the stabilizing power circuit is connected to each of the at least one pair of voltage sensing terminals via the at least one pair of input resistors.
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Accused Products
Abstract
In a voltage monitoring apparatus, a capacitor circuit includes at least one capacitor. Input-side switches are connected to electrode terminals of at least one battery cell, and apply voltage to terminals of the capacitor. A voltage detection circuit includes a pair of voltage sensing terminals connected to terminals of the capacitor, and detects the potential difference across voltage sensing terminals. Output-side switches are connected to terminals of the capacitor, and apply voltage across terminals of the capacitor to the voltage sensing terminals. An impedance circuit is connected to the voltage sensing terminals. A stabilizing power circuit is connected to the voltage sensing terminals via the impedance circuit, and stabilizes voltage of the voltage sensing terminals. Based on the detected voltage when one of the output-side switches is turned on, an on-failure of the remaining output-side switches which should not be turned on are detected by a control unit.
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Citations
10 Claims
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1. A voltage monitoring apparatus comprising:
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a capacitor circuit including at least one capacitor; an input-side switch group that includes a plurality of input-side switches connected to at least one pair of electrode terminals of at least one battery cell, the input-side switch group applying voltage to a pair of terminals of the at least one capacitor; a voltage detection circuit that includes at least one pair of voltage sensing terminals connected to each of the terminals of the at least one capacitor, the voltage detection circuit detecting a potential difference across the at least one pair of voltage sensing terminals; an output-side switch group that includes a plurality of output-side switches connected to the terminals of the at least one capacitor, the output-side switch group applying voltage across the terminals of the at least one capacitor to the at least one pair of voltage sensing terminals; switch control means for controlling each of the plurality of input-side switches and each of the plurality of output-side switches; failure detecting means for detecting, on the basis of the voltage detected by the voltage detection circuit when one of the output-side switches is turned on, an on-failure of at least one of the remaining output-side switches which should not be turned on; an impedance circuit that is connected to each of the at least one pair of voltage sensing terminals, the impedance circuit being connected to each of the plurality of output-side switches, connected to the terminals of the at least one capacitor, via the each of the at least one pair of voltage sensing terminals; and a stabilizing power circuit that is connected to each of the at least one pair of voltage sensing terminals via the impedance circuit and stabilizes voltage of each of the at least one pair of voltage sensing terminals, wherein the impedance circuit is configured such that a time constant of a circuit configured by the impedance circuit and the at least one capacitor, which are connected to each other via each of the plurality of output-side switches and the each of the at least one pair of voltage sensing terminals, becomes longer than a required detection time that is taken from when a voltage across the terminals of the at least one capacitor is applied to the at least one pair of voltage sensing terminals until when a potential difference between the at least one pair of voltage sensing terminals is detected by the voltage detection circuit, the voltage detection circuit includes a differential amplifier circuit that amplifies and outputs at least one potential difference between the at least one pair of voltage sensing terminals; the differential amplifier circuit includes at least one pair of input resistors connected to the at least one pair of voltage sensing terminals; and the stabilizing power circuit is connected to each of the at least one pair of voltage sensing terminals via the at least one pair of input resistors. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A battery system comprising:
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a battery pack that is configured by at least one battery cell; and a voltage monitoring apparatus that includes; a capacitor circuit including at least one capacitor; an input-side switch group that includes a plurality of input-side switches connected to at least one pair of electrode terminals of the at least one battery cell, the input-side switch group applying voltage to a pair of terminals of the at least one capacitor; a voltage detection circuit that includes at least one pair of voltage sensing terminals connected to each of the terminals of the at least one capacitor, the voltage detection circuit detecting a potential difference across the at least one pair of voltage sensing terminals; an output-side switch group that includes a plurality of output-side switches connected to the terminals of the at least one capacitor, the output-side switch group applying voltage across the terminals of the at least one capacitor to the at least one pair of voltage sensing terminals; switch control means for controlling each of the plurality of input-side switches and each of the plurality of output-side switches; failure detecting means for detecting, on the basis of the voltage detected by the voltage detection circuit when one of the output-side switches is turned on, an on-failure of at least one of the remaining output-side switches which should not be turned on; an impedance circuit that is connected to each of the at least one pair of voltage sensing terminals, the impedance circuit being connected to each of the plurality of output-side switches, connected to the terminals of the at least one capacitor, via the each of the at least one pair of voltage sensing terminals; and a stabilizing power circuit that is connected to each of the at least one pair of voltage sensing terminals via the impedance circuit and stabilizes voltage of each of the at least one pair of voltage sensing terminals, wherein the impedance circuit is configured such that a time constant of a circuit configured by the impedance circuit and the at least one capacitor, which are connected to each other via each of the plurality of output-side switches and the each of the at least one pair of voltage sensing terminals, becomes longer than a required detection time that is taken from when a voltage across the terminals of the at least one capacitor is applied to the at least one pair of voltage sensing terminals until when a potential difference between the at least one pair of voltage sensing terminals is detected by the voltage detection circuit, the voltage detection circuit includes a differential amplifier circuit that amplifies and outputs at least one potential difference between the at least one pair of voltage sensing terminals; the differential amplifier circuit includes at least one pair of input resistors connected to the at least one pair of voltage sensing terminals; and the stabilizing power circuit is connected to each of the at least one pair of voltage sensing terminals via the at least one pair of input resistors. - View Dependent Claims (8, 9, 10)
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Specification