Battery state of charge indicator with an indicator circuit
AssigneeDuracell U.S. Operations, Inc.
InventorsJordan Todorov Bourilkov, Steven Jeffrey Specht
Life of this patent
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Abstract
A state of charge indicator including an indicator with a display threshold and an indicator circuit electrically coupled to the indicator such that when a main cell voltage of a main cell is greater than a display threshold, the indicator circuit applies a driver voltage to the indicator such that the indicator is inactive and when the main cell voltage is less than the display threshold, the indicator circuit applies the driver voltage to the indicator such that the indicator is active.
Claims18
A state of charge indicator, comprising:
- an indicator with a display threshold;
- and
- an indicator circuit electrically coupled to the indicator such that when a main cell voltage of a main cell is greater than the display threshold, the indicator circuit applies a driver voltage to the indicator such that the indicator is inactive and when the main cell voltage is less than the display threshold, the indicator circuit applies the driver voltage to the indicator such that the indicator is active;
- wherein when the indicator is active, the indicator does not become inactive until the main cell voltage is less than or about equal to a hysteresis reset voltage of at least 50 mV below the display threshold.
An energy storage replacement indicator system, comprising:
- a display electrically coupled to an energy storage device with an energy storage voltage;
- and
- an indicator circuit electrically coupled to the display, the indicator circuit establishes a display threshold such that when the energy storage voltage is greater than the display threshold, the indicator circuit applies a driver voltage to the display such that the display is inactive, and when the energy storage voltage is less than the display threshold, the indicator circuit applies the driver voltage to the display such that the display is active;
- wherein the display remains inactive until a period of detection time is reached, the period of detection time being a duration of time for which the energy storage voltage must be less than or about equal to the display threshold.
Dependencies are inferred from the claim text.