Charging or discharging apparatus for electrically charging or discharging a capacitor storage type power source adapted to store electric energy in electric double layer capacitors
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United States of America Patent
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Nov 24, 2009
Grant Date -
Aug 23, 2007
app pub date -
Feb 16, 2007
filing date -
Feb 17, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A charging apparatus for electrically charging a capacitor storage type power source comprises a switching circuit for turning on/off the charge current, a current detection circuit for detecting the charge current, a voltage detection circuit for detecting the voltage of power source, a constant current control circuit for outputting an error amplifying signal according to the current value, a power control circuit for outputting an error amplifying signal according to the current value, the voltage value-and a power reference value, a constant voltage control circuit for outputting an error amplifying signal according to the voltage value and a voltage reference value, an OR circuit for selecting one of the error amplifying signals and a control circuit for generating a pulse width modulation signal according to the error amplifying signal output from the OR circuit to turn on/off the switching circuit and control the charge current.
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