High speed battery charging system with high accuracy voltage sensing
First Claim
1. A system for charging a battery comprising(a) A power supply for providing power output having a return line;
- (b) A means for converting voltage and current levels;
(c) A means for controlling power conversion means having one or more terminals;
(d) A battery comprisingProtection circuitry for opening a circuit under fault conditions;
Memory circuitry for storing identification and instruction data;
Temperature sensing means for sensing a temperature of one or more cells;
An energy storage cell with positive and negative terminals;
External terminals for power input and output and data;
(e) Interface circuitry for interpreting data from said memory means and said temperature sensing means;
(f) A means for accurately sensing voltage directly at the positive and negative terminals of said battery cell;
(g) A switch means comprising at least four switches, S1, S2, S3 and S4 whereinOpening all four switches activates said voltage sensing means and deactivates both said memory means and said temperature sensing means;
Closing S1 and S2 while opening S3 open activates said memory means and deactivates both said voltage sensing means and said temperature sensing means;
Closing S3 and opening S1 and S2 activates said temperature sensing means and deactivates both said voltage sensing means and said memory means;
S4 is connected as to be closed when both S1 and S2 are closed and otherwise be open.
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Accused Products
Abstract
A battery charging system 100 is provided which comprises a charger 101 and a battery pack 102. The battery pack 102 comprises a battery cell or cells 150, memory means 140, temperature sensing means 147, and a high accuracy, high impedance voltage sensing means 112 that senses voltage directly at the battery cell terminals 151, 149. By sensing directly at the cell terminals 151, 149, charging error due to parasitic conductor impedances 132, 138 can be eliminated. The voltage sensing means 112 allows memory 140 and thermistor 147 data to be multiplexed, allowing the system to operate with four or fewer battery terminals.
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Citations
7 Claims
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1. A system for charging a battery comprising
(a) A power supply for providing power output having a return line; -
(b) A means for converting voltage and current levels; (c) A means for controlling power conversion means having one or more terminals; (d) A battery comprising Protection circuitry for opening a circuit under fault conditions; Memory circuitry for storing identification and instruction data; Temperature sensing means for sensing a temperature of one or more cells; An energy storage cell with positive and negative terminals; External terminals for power input and output and data; (e) Interface circuitry for interpreting data from said memory means and said temperature sensing means; (f) A means for accurately sensing voltage directly at the positive and negative terminals of said battery cell; (g) A switch means comprising at least four switches, S1, S2, S3 and S4 wherein Opening all four switches activates said voltage sensing means and deactivates both said memory means and said temperature sensing means; Closing S1 and S2 while opening S3 open activates said memory means and deactivates both said voltage sensing means and said temperature sensing means; Closing S3 and opening S1 and S2 activates said temperature sensing means and deactivates both said voltage sensing means and said memory means; S4 is connected as to be closed when both S1 and S2 are closed and otherwise be open. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification