Electronic device with supervisor circuit for detecting resistance parameter of an energy storage device
First Claim
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1. An electronic device comprising:
- an energy storage device;
circuitry supplied with a storage device voltage from the energy storage device; and
a supervisor circuit configured to enable the circuitry in response to the storage device voltage exceeding an enable threshold voltage;
wherein the supervisor circuit is configured to detect a resistance parameter indicative of an internal resistance of the energy storage device and to adjust the enable threshold voltage based on the resistance parameter;
wherein the supervisor circuit comprises a test current generator configured to draw a test current from the energy storage device for testing the internal resistance of the energy storage device; and
wherein the test current generator comprises a plurality of capacitors and a plurality of switches for selecting whether the capacitors are coupled in parallel or coupled in series across the energy storage device.
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Abstract
An electronic device has an energy storage device and circuitry supplied with a storage device voltage from the energy storage device. A supervisor circuit enables the circuitry in response to the storage device exceeding an enable threshold voltage. The supervisor circuit detects a resistance parameter which is indicative of an internal resistance of the energy storage device and adjusts the enable threshold voltage based on the resistance parameter.
10 Citations
20 Claims
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1. An electronic device comprising:
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an energy storage device; circuitry supplied with a storage device voltage from the energy storage device; and a supervisor circuit configured to enable the circuitry in response to the storage device voltage exceeding an enable threshold voltage; wherein the supervisor circuit is configured to detect a resistance parameter indicative of an internal resistance of the energy storage device and to adjust the enable threshold voltage based on the resistance parameter; wherein the supervisor circuit comprises a test current generator configured to draw a test current from the energy storage device for testing the internal resistance of the energy storage device; and wherein the test current generator comprises a plurality of capacitors and a plurality of switches for selecting whether the capacitors are coupled in parallel or coupled in series across the energy storage device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An electronic device comprising:
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an energy storage device; circuitry supplied with a storage device voltage from the energy storage device; and a supervisor circuit configured to enable the circuitry in response to the storage device voltage exceeding an enable threshold voltage; wherein the supervisor circuit is configured to detect a resistance parameter indicative of an internal resistance of the energy storage device and to adjust the enable threshold voltage based on the resistance parameter; wherein the supervisor circuit comprises a test current generator configured to draw a test current from the energy storage device for testing the internal resistance of the energy storage device; and wherein the resistance parameter comprises a count value representing a time taken for the storage device voltage to rise to a sample voltage level following the voltage drop caused by the test current. - View Dependent Claims (17, 18)
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19. An electronic device comprising:
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energy storage means for storing energy; circuit means for being supplied with a storage device voltage from the energy storage means; and supervising means for enabling the circuit means in response to the storage device voltage exceeding an enable threshold voltage; wherein the supervising means is configured to detect a resistance parameter indicative of an internal resistance of the energy storage means and to adjust the enable threshold voltage based on the resistance parameter; wherein the supervising means comprises a test current generating means configured to draw a test current from the energy storage means for testing the internal resistance of the energy storage means; and wherein the test current generating means comprises a plurality of capacitors and a plurality of switches for selecting whether the capacitors are coupled in parallel or coupled in series across the energy storage means.
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20. A method for an electronic device comprising an energy storage device and circuitry supplied with a storage device voltage from the energy storage device;
- the method comprising;
detecting whether the storage device voltage exceeds an enable threshold voltage; enabling the circuitry in response to the storage device voltage exceeding the enable threshold voltage; detecting a resistance parameter indicative of an internal resistance of the energy storage device; drawing a test current from the energy storage device for testing the internal resistance of the energy storage device; coupling a plurality of capacitors and a plurality of switches to the energy storage device in a configuration for selecting whether the capacitors are coupled in parallel or coupled in series across the energy storage device; and adjusting the enable threshold voltage based on the resistance parameter.
- the method comprising;
Specification