Method and apparatus for controlling charging of electrical power storage unit
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United States of America Patent
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Mar 10, 1998
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N/A
app pub date -
Feb 26, 1996
filing date -
Feb 27, 1995
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Abstract
An electric power storage unit consisting of a series combination of capacitor cells. The storage unit is electrically charged with a constant charging current from a charger with a simple structure. If necessary, the simple structure remotely controls the limit voltages of the capacitor cells and varies the capacity and output power of the storage unit according to use conditions. When the terminal voltages reach reference voltages, parallel charging control units bypass the charging current. The parallel charging control units comprise shunt regulators connected in parallel with their respective capacitor cells and acting to bypass the charging current, coupling circuits for connection with a signal source and reference voltage control circuits. The reference voltage control the circuits establish reference voltages according to the output signals from the coupling circuits, compare the terminal voltages of the capacitor cells and control the shunt regulators according to the results of the comparisons. The control units can be digitized using digital signals.
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