US Patent No: 6,445,162
Number of patents in Portfolio can not be more than 2000
Detecting a remaining battery capacity and a battery remaining capacity circuit
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Sep 3, 2002
Issued date -
Feb 6, 2001
filing date -
09/778,275
serial no -
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Abstract
A battery circuit, including a secondary battery, a storage capacitor, two switches and two voltage monitor circuits, detects a remaining capacity of the secondary battery and sends out data indicative of the remaining capacity to outside of the battery circuit. A first switch connects a secondary battery to a storage capacitor. A second switch connects the other end of the first switch to the storage capacitor and a load. A storage capacitor voltage monitor circuit measures voltage of the storage capacitor. The first switch is then turned ON and a current from the battery is transferred to the storage capacitor. At this time, the second switch is OFF. Then, the first switch is then turned OFF, and voltage of the storage capacitor indicative of the voltage of the secondary battery is measured. Then, the second switch turns ON and the current flows from the storage capacitor to the external load. The voltage across the capacitor is measured again and the remaining capacity of the battery can be accurately determined.
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| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
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