Patent ID: 8446142
Filing Date: 2013-05-21
Classification: G01R

Abstract:
1. A capacity detector for detecting capacity of an energy storage unit, comprising: a first buffer operable for generating a first threshold reference according to a first adjustable reference which is predetermined based upon a voltage versus capacity characteristic of said energy storage unit, said first adjustable reference corresponding to an upper-limit capacity of said energy storage unit; a second buffer operable for generating a second threshold reference according to a second adjustable reference which is predetermined based upon said voltage versus capacity characteristic of said energy storage unit, said second adjustable reference corresponding to a lower-limit capacity of said energy storage unit; and a voltage divider coupled to said first buffer and said second buffer, and operable for dividing a voltage across said first threshold reference and said second threshold reference to provide a plurality of capacity references indicating a plurality of capacity information of said energy storage unit, wherein said capacity references are generated according to said voltage versus capacity characteristic of said energy storage unit, and wherein a sensed voltage of said energy storage unit is compared to said capacity references to generate a plurality of capacity indication signals indicative of capacity information of said energy storage unit.