Electronic device with supervisor circuit for detecting resistance parameter of an energy storage device

摘要

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.

主权项

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.