Electronic circuit for measuring series connected electrochemical cell voltages
First Claim
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1. A voltage measuring circuit for measuring voltage signals in an energy storage device comprising:
- a plurality of energy storage cells forming the energy storage device;
a voltage divider circuit connected to at least one of the energy storage cells whereby each of the energy storage cells has an isolated battery cell segment voltage;
an electronic circuit for representing the isolated battery cell segment voltage as a proportional voltage referenced to ground; and
a voltage measurement node associated with the electronic circuit for producing a voltage signal which is proportional to the voltage across the isolated battery cell segment.
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Abstract
An electronic circuit for measuring voltage signals in an energy storage device is disclosed. The electronic circuit includes a plurality of energy storage cells forming the energy storage device. A voltage divider circuit is connected to at least one of the energy storage cells. A current regulating circuit is provided for regulating the current through the voltage divider circuit. A voltage measurement node is associated with the voltage divider circuit for producing a voltage signal which is proportional to the voltage across the energy storage cell.
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Citations
18 Claims
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1. A voltage measuring circuit for measuring voltage signals in an energy storage device comprising:
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a plurality of energy storage cells forming the energy storage device; a voltage divider circuit connected to at least one of the energy storage cells whereby each of the energy storage cells has an isolated battery cell segment voltage; an electronic circuit for representing the isolated battery cell segment voltage as a proportional voltage referenced to ground; and a voltage measurement node associated with the electronic circuit for producing a voltage signal which is proportional to the voltage across the isolated battery cell segment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An electronic circuit for measuring voltage signals in an energy storage device having a plurality of energy storage cells, the circuit comprising:
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at least one current mirror circuit connected across one of the energy storage cells for converting a differential voltage to a reference current, the at least one current mirror circuit including a temperature compensation circuit, a second resistor and a third resistor; said temperature compensation circuit including two base connected transistors and a first resistor for developing the reference current; the second resistor connected to a collector of one of the base connected transistors for converting the reference current to a representative voltage; and the third resistor connected to a collector of the other base connected transistor for drawing a compensating current proportional to the reference current; and a voltage divider circuit connected to at least one of the energy storage cells. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. An electronic circuit for measuring voltage signals in an energy storage device comprising:
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a plurality of energy storage cells forming the energy storage device; at least one current mirror circuit connected across one of the energy storage cells for converting a differential voltage to a reference current, the at least one current mirror circuit including a temperature compensation circuit, a second resistor and a third resistor; said temperature compensation circuit including two base connected transistors, a first diode connected in series with a first resistor for developing the reference current, and a second diode connected to an emitter of one of the base connected transistors; the second resistor connected to a collector of one of the base connected transistors for converting the reference current to a representative voltage; and the third resistor connected to a collector of the other base connected transistor for drawing a compensating current proportional to the reference current; a switch in series with the third resistor operative to disable the at least one current mirror circuit; and a voltage divider circuit connected to one of the energy storage cells.
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Specification