Battery voltage measuring system
First Claim
1. A battery voltage measuring system comprising:
- a battery configured to supply a battery voltage as a higher reference voltage;
a first power supply configured to supply a first reference voltage as an input voltage; and
a second power supply configured to supply a second reference voltage as a lower reference voltage which is lower than the higher reference voltage; and
an analog/digital converter configured to receive the higher reference voltage and the lower reference voltage and to outputs a digital output value based on the input voltage which is lower than the higher reference voltage and is higher than the lower reference voltage.
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Accused Products
Abstract
A battery voltage measuring system includes an analog/digital converter configured to receive a higher reference voltage and a lower reference voltage which is lower than the higher reference voltage and to outputs a digital output value based on an input voltage which is lower than the high voltage reference voltage and is higher than the low voltage reference voltage. A battery supplies a battery voltage as the higher reference voltage to the analog/digital converter; a first power supply supplies a first reference voltage as the input voltage to the analog/digital converter; and a second power supply supplies a second reference voltage as the lower reference voltage to the analog/digital converter.
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Citations
16 Claims
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1. A battery voltage measuring system comprising:
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a battery configured to supply a battery voltage as a higher reference voltage; a first power supply configured to supply a first reference voltage as an input voltage; and a second power supply configured to supply a second reference voltage as a lower reference voltage which is lower than the higher reference voltage; and an analog/digital converter configured to receive the higher reference voltage and the lower reference voltage and to outputs a digital output value based on the input voltage which is lower than the higher reference voltage and is higher than the lower reference voltage. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of measuring a battery voltage, comprising:
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supplying a battery voltage to an analog/digital converter as a higher reference voltage; supplying a first reference voltage to said analog/digital converter as an input voltage; supply a second reference voltage to said analog/digital converter as a lower reference voltage; and converting the input voltage which is lower than the higher reference voltage and is higher than the lower reference voltage into a digital output value by said analog/digital converter. - View Dependent Claims (8, 9)
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10. A voltage monitor circuit comprising:
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first and second terminals between which a voltage to be monitored is supplied; and an A/D converter having an input node and first and second reference nodes and performing an A/D converting operation on a voltage supplied to the input node in response to a voltage between the first and second reference nodes, the first reference node being connected to the first terminal, the input node being supplied with a first reference voltage which is generated with respect to the second terminal, and the second reference node being supplied with a second reference voltage which is different from a voltage supplied to the second terminal. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification