| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power factor corrected direct-current power supply wherein a favorable power factor can be obtained by a low-cost transformer for input alternating current measurement (CT), without the use of an expensive direct-current transformer (DCCT). <P>SOLUTION: The power factor corrected direct-current power supply is so constructed that the following is implemented an input current value obtained by A/D-converting an input alternating current measurement value is corrected at a zero-cross point in an input voltage value, obtained by A/D-converting an input alternating-current voltage measurement value. As a result, stable control can be carried out, even if the input alternating current becomes imbalanced; and the zero point of CT output is shifted, when the input alternating current is measured by using the inexpensive CT, or the like. <P>COPYRIGHT: (C)2008,JPO&INPIT |
