AC power supply and method for controlling output current thereof
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United States of America Patent
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Dec 15, 2009
Grant Date -
Oct 23, 2008
app pub date -
Apr 19, 2007
filing date -
Apr 19, 2007
priority date (Note) -
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Abstract
An AC power supply and a method for dynamically controlling the output current thereof are disclosed. An output voltage stop signal is used to disable a DC/AC converter from outputting. During a period that the DC/AC converter stops its output, the output current of the DC/AC converter is measured and is fed back to a output current control device as an output current feedback signal to produce a deviation. Using the difference between the output current feedback signal of the DC/AC converter and the deviation, an approximate DC value of the output current of the DC/AC converter is calculated. With reference to the approximate DC value, the DC/AC converter can be controlled so that the DC current injection in the output current is approximately zero.
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