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US 9,429,627 B2Granted
Electronic device with supervisor circuit for detecting resistance parameter of an energy storage device
AssigneeThe Regents of the University of Michigan
InventorsIn Hee Lee, Yoonmyung Lee, Dennis Michael Sylvester, David Theodore Blaauw
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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.
Claims20
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.
5 more elements
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 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.
5 more elements
An electronic device comprising:
- 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.
5 more elements
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.
5 more elements
Dependencies are inferred from the claim text.