Automatic battery charging system using lowest charge current de

Details Automatic battery charging system using lowest charge current de Automatic battery charging system using lowest charge current de

1994-06-16

1998-12-01

Tso, Edward H.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 39, 320 48, H01M 1046

Patent

active

058443983

ABSTRACT:
An automatic charging system for charging nickel-metal-hydride batteries is presented. The battery charging system uses a method of detecting the lowest charge current to control its charging process. The system has a constant voltage power supply including a short-circuit protection device, a battery voltage detector, a current detector, a current to voltage converter, a voltage amplifier, an analog to digital converter, a single chip microcomputer, a capacity indicator, a time indicator and a full-charge indicator. The system uses a constant voltage to charge batteries with a floating current according to the quantity of the active ions in the batteries. The battery charge current is converted to a voltage signal which is then amplified and digitized. The microcomputer detects the digitized signal to estimate the magnitude of the charge current. By detecting continuous increase in the charge current, the system determines if the charging process has reached its end and shuts down the power supply at appropriate time. It avoids providing too much input energy and generating extra heat. Therefore, the system has high charging efficiency and is less likely to damage the batteries.

REFERENCES:
patent: 4114083 (1978-09-01), Benham et al.

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