Constant voltage and constant current power source
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United States of America Patent
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Issued Date -
May 29, 2008
app pub date -
Feb 27, 2007
filing date -
Nov 28, 2006
priority date (Note) -
Abandoned
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Abstract
A filter for smoothing pulse voltage outputted by a transistor has a diode, an inductance, a resistor element and a capacitor. The resistor element is functionally homologous to the equivalent series resistance of the capacitor. A capacitor having a low equivalent series resistance can be used as the capacitor by virtue of employing as the resistor element a resistor having a resistance value such that the control circuit is supplied with the necessary and sufficient feedback signals for a stable operation of a feedback system. Reducing the equivalent series resistance of the capacitor allows suppressing generation of ripple voltage inputted to the battery, making it possible to realize stable charge control.
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