Battery state of charge indicator with an auxiliary cell
First Claim
Patent Images
1. A state of charge indicator, comprising:
- an indicator with a display threshold;
an auxiliary cell having an auxiliary cell voltage, the auxiliary cell is electrically coupled to the indicator such that when a difference between a main cell voltage of a main cell and the auxiliary cell voltage is less than the display threshold, the step indicator is inactive and when the difference between the main cell voltage and the auxiliary cell voltage is greater than or about equal to the display threshold, the indicator is active; and
wherein when the indicator is active, the indicator does not become inactive until the difference between the main cell voltage and the auxiliary cell voltage is less than or about equal to a hysteresis reset voltage of at least 50 mV below the display threshold.
2 Assignments
0 Petitions
Accused Products
Abstract
A state of charge indicator may include an indicator with a display threshold and an auxiliary cell having an auxiliary cell voltage. The auxiliary cell may be electrically coupled to the indicator such that when a difference between a main cell voltage of a main cell and the auxiliary cell voltage is less than the display threshold, the indicator is inactive and when the difference between the main cell voltage and the auxiliary cell voltage is greater than or about equal to the display threshold, the indicator is active.
43 Citations
20 Claims
-
1. A state of charge indicator, comprising:
-
an indicator with a display threshold; an auxiliary cell having an auxiliary cell voltage, the auxiliary cell is electrically coupled to the indicator such that when a difference between a main cell voltage of a main cell and the auxiliary cell voltage is less than the display threshold, the step indicator is inactive and when the difference between the main cell voltage and the auxiliary cell voltage is greater than or about equal to the display threshold, the indicator is active; and wherein when the indicator is active, the indicator does not become inactive until the difference between the main cell voltage and the auxiliary cell voltage is less than or about equal to a hysteresis reset voltage of at least 50 mV below the display threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. An energy storage replacement indicator system, comprising:
-
an indicator comprising a display with a display threshold; an auxiliary cell having an auxiliary cell voltage that is inverse-proportional to an energy storage voltage of an energy storage device, the auxiliary cell is electrically coupled to the display such that when a difference between the energy storage voltage and the auxiliary cell voltage is less than the display threshold, the display is inactive and when the difference between the energy storage voltage and the auxiliary cell voltage is greater than or about equal to the display threshold, the display is active; and 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 difference between the energy storage voltage and the auxiliary cell voltage must be greater than or about equal to the display threshold. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification