Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1990-09-17
1992-11-24
Stephan, Steven L.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 21, 320DIG1, H01M 1044, H02J 710
Patent
active
051665956
ABSTRACT:
A switch mode battery charging system wherein a switch mode power supply is provided which is operating at a frequency substantially above a line frequency of AC line voltage supplying the battery charging system. The system of the invention can automatically switch back and forth between an equalize mode and a float mode of operation. The system of the invention also compensates for severe line voltage variations, provides a low ripple controllable DC voltage and current output, and is compact, light weight, and highly efficient in view of its high frequency operation. Furthermore, the system of the invention provides optimized and automatic charging of batteries in various states of discharge. The system automatically senses to determine whether or not battery equalization and desulfation is necessary, and automatically determines a length of time for equalization depending upon a charge state of the battery. Thereafter, the system provides for a surface charge depletion mode followed by an automatic float mode to maintain the battery at the float voltage during storage. If the system determines that equalization is not necessary, then the float mode is instituted and the equalization charging mode does not occur.
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Haszko D. R.
Stephan Steven L.
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