ENERGY STORAGE DEVICE
First Claim
1. An energy storage device comprising:
- an energy storage section;
a charging circuit electrically coupled to the energy storage section;
a first comparator electrically coupled to the energy storage section, an output of the first comparator being inverted when a voltage (Vc) of the energy storage section reaches a first predetermined voltage (Vc1);
a second comparator electrically coupled to the energy storage section, an output of the second comparator being inverted when the voltage (Vc) of the energy storage section reaches a second predetermined voltage (Vc2), the second predetermined voltage (Vc2) being greater than the first predetermined voltage (Vc1); and
a control circuit electrically coupled to the charging circuit, the first comparator, and the second comparator;
wherein the control circuit obtains a period (tm) from inversion of the output of the first comparator to inversion of the output of the second comparator at charging the energy storage section with a constant current (Ics), and calculates a capacitance C of the energy storage section based on the period (tm) and a voltage change width (Δ
Vc) between the first predetermined voltage (Vc1) and the second predetermined voltage (Vc2) that are previously identified.
1 Assignment
0 Petitions
Accused Products
Abstract
In an energy storage device, a charging circuit is electrically coupled to the energy storage section. A first comparator is electrically coupled to an energy storage section, and its output is inverted when voltage Vc of the energy storage section reaches first predetermined voltage Vc1. A second comparator is electrically coupled to the energy storage section, and its output is inverted when voltage Vc of the energy storage section reaches second predetermined voltage Vc2. A control circuit is electrically coupled to the first comparator and the second comparator. The control circuit obtains period tm from inversion of the output of the first comparator to the output of the second comparator. Capacitance C of the energy storage section is calculated based on this period tm and voltage change width ΔVc between the first predetermined voltage Vc1 and the second predetermined voltage Vc2.
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Citations
8 Claims
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1. An energy storage device comprising:
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an energy storage section; a charging circuit electrically coupled to the energy storage section; a first comparator electrically coupled to the energy storage section, an output of the first comparator being inverted when a voltage (Vc) of the energy storage section reaches a first predetermined voltage (Vc1); a second comparator electrically coupled to the energy storage section, an output of the second comparator being inverted when the voltage (Vc) of the energy storage section reaches a second predetermined voltage (Vc2), the second predetermined voltage (Vc2) being greater than the first predetermined voltage (Vc1); and a control circuit electrically coupled to the charging circuit, the first comparator, and the second comparator; wherein the control circuit obtains a period (tm) from inversion of the output of the first comparator to inversion of the output of the second comparator at charging the energy storage section with a constant current (Ics), and calculates a capacitance C of the energy storage section based on the period (tm) and a voltage change width (Δ
Vc) between the first predetermined voltage (Vc1) and the second predetermined voltage (Vc2) that are previously identified. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification