System and method for measuring battery voltage
First Claim
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1. An apparatus for measuring battery voltage comprising:
- a first capacitor configured to receive a charge from a battery;
a first switch configured to selectively couple the first capacitor to the battery;
a second capacitor having a first terminal coupled to a reference potential and second terminal coupled to the first capacitor to form a node between the capacitors;
a second switch configured to allow at least a portion of the charge on the first capacitor to transfer to the second capacitor to generate a voltage across the second capacitor that is proportional to the battery voltage; and
a measurement circuit configured to measure the generated voltage at the node between the capacitors and provide an output signal representing the battery voltage.
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Abstract
An apparatus and method for measuring battery voltage includes a first capacitor configured to receive a charge from a battery. A first switch may be configured to selectively couple the first capacitor to the battery. A second capacitor may be coupled to a reference potential. A second switch may be configured to selectively couple the second capacitor to the first capacitor to transfer at least a portion of the charge on the first capacitor to the second capacitor.
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Citations
22 Claims
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1. An apparatus for measuring battery voltage comprising:
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a first capacitor configured to receive a charge from a battery; a first switch configured to selectively couple the first capacitor to the battery; a second capacitor having a first terminal coupled to a reference potential and second terminal coupled to the first capacitor to form a node between the capacitors; a second switch configured to allow at least a portion of the charge on the first capacitor to transfer to the second capacitor to generate a voltage across the second capacitor that is proportional to the battery voltage; and a measurement circuit configured to measure the generated voltage at the node between the capacitors and provide an output signal representing the battery voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 21)
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12. A method for measuring battery voltage comprising the steps of:
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selectively coupling a first, floating capacitor to a battery to allow charge to flow from the battery to the first capacitor; selectively operating a switch to allow at least a portion of the charge from the first capacitor to transfer to a second capacitor to generate a voltage across the second capacitor that is proportional to the battery voltage; and measuring the generated voltage across the second capacitor; and providing an output signal based on the generated voltage across the second capacitor and representative of the battery voltage wherein a first terminal of the second capacitor is coupled to a reference potential and a second terminal of the second capacitor is coupled to the first capacitor. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 22)
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Specification