Assembled battery total voltage detection circuit
First Claim
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1. An assembled battery total voltage detection circuit for detecting a total voltage of an assembled battery configured by connecting a plurality of batteries, comprising:
- a main control circuit that includes an A/D converter operating with a positive single power supply;
a divider resistor connected between a plus terminal and a minus terminal of the assembled battery insulated from the main control circuit;
a differential amplifier circuit, including a first buffer, a second buffer and a differential amplifier, that amplifies voltage divided by the divider resistor and that outputs the amplified voltage to the A/D converter, the first buffer, the second buffer and the differential amplifier each being constituted by an operational amplifier operating with a positive single power supply; and
a third buffer for applying a bias voltage to the midpoint of the divider resistor, the third buffer being constituted by an operational amplifier that operates with a positive single power supply, whereinthe bias voltage is a positive constant electric potential relative to a ground of the main control circuit and is set based upon an operating voltage of the operational amplifier;
the amplified voltage output from the differential amplifier circuit and input to the A/D converter varies within a range of the operating voltage of the operational amplifier; and
the main control circuit;
inputs the voltage divided by the divider resistor, the midpoint of which is biased to the positive electric potential by the third buffer, to the A/D converter via the differential amplifier circuit, and measures the total voltage of the assembled battery; and
inputs output voltages of the first and second buffers and the bias voltage to the A/D converter, measures the output voltages of the first and second buffers and the bias voltage, and performs fault diagnosis of the assembled battery total voltage detection circuit based upon the measured total voltage, the measured output voltages of the first and second buffers and the measured bias voltage.
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Abstract
An assembled battery total voltage detection circuit includes a main control circuit, a divider resistor connected between a plus terminal and a minus terminal of an assembled battery insulated from the main control circuit, and a differential amplifier circuit that amplifies voltage divided by the divider resistor. A constant electric potential relative to a ground of the main control circuit is applied to a midpoint of the divider resistor. The main control circuit measures the voltage divided by the divider resistor via the differential amplifier circuit.
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Citations
17 Claims
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1. An assembled battery total voltage detection circuit for detecting a total voltage of an assembled battery configured by connecting a plurality of batteries, comprising:
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a main control circuit that includes an A/D converter operating with a positive single power supply; a divider resistor connected between a plus terminal and a minus terminal of the assembled battery insulated from the main control circuit; a differential amplifier circuit, including a first buffer, a second buffer and a differential amplifier, that amplifies voltage divided by the divider resistor and that outputs the amplified voltage to the A/D converter, the first buffer, the second buffer and the differential amplifier each being constituted by an operational amplifier operating with a positive single power supply; and a third buffer for applying a bias voltage to the midpoint of the divider resistor, the third buffer being constituted by an operational amplifier that operates with a positive single power supply, wherein the bias voltage is a positive constant electric potential relative to a ground of the main control circuit and is set based upon an operating voltage of the operational amplifier; the amplified voltage output from the differential amplifier circuit and input to the A/D converter varies within a range of the operating voltage of the operational amplifier; and the main control circuit; inputs the voltage divided by the divider resistor, the midpoint of which is biased to the positive electric potential by the third buffer, to the A/D converter via the differential amplifier circuit, and measures the total voltage of the assembled battery; and inputs output voltages of the first and second buffers and the bias voltage to the A/D converter, measures the output voltages of the first and second buffers and the bias voltage, and performs fault diagnosis of the assembled battery total voltage detection circuit based upon the measured total voltage, the measured output voltages of the first and second buffers and the measured bias voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An assembled battery total voltage detection circuit for detecting a total voltage of an assembled battery configured by connecting a plurality of batteries, comprising:
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a main control circuit that includes an A/D converter operating with a positive single power supply; a divider resistor connected between a plus terminal and a minus terminal of the assembled battery insulated from the main control circuit, the divider resistor being constituted by a series circuit consisting of first, second, third and fourth resistors; a differential amplifier circuit that includes a first buffer, a second buffer and a differential amplifier, that amplifies voltage divided by the divider resistor and that outputs the amplified voltage to the A/D converter, the first buffer, the second buffer and the differential amplifier each being constituted by an operational amplifier operating with a positive single power supply; and a third buffer for applying a bias voltage to a connection point of the second and third resistors, the third buffer being constituted by an operational amplifier that operates with a positive single power supply, wherein a connection point of the first and second resistors is connected to a positive phase input side of the differential amplifier; a connection point of the third and fourth resistors is connected to a negative phase input side of the differential amplifier; the bias voltage is a positive constant electric potential relative to a ground of the main control circuit and is set based upon an operating voltage of the operational amplifier; the amplified voltage output from the differential amplifier circuit and input to the A/D converter varies within a range of the operating voltage of the operational amplifier; and the main control circuit; inputs voltage between the connection point of the first and second resistors and the connection point of the third and fourth resistors of the divider resistor, the connection point of the second and third resistors of which is biased to the positive electric potential by the third buffer, to the A/D converter via the differential amplifier circuit, and measures the total voltage of the assembled battery; and inputs output voltages of the first and second buffers and the bias voltage to the A/D converter, measures the output voltages of the first and second buffers and the bias voltage, and performs fault diagnosis of the assembled battery total voltage detection circuit based upon the measured total voltage, the measured output voltages of the first and second buffers and the measured bias voltage. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification