| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an AC/DC wattmeter capable of measuring both DC power and AC power. <P>SOLUTION: The AC/DC wattmeter 1 includes: a current detection section 12 for outputting a signal of a size corresponding to a current value of an input current flowing in a power line L1; a voltage detection section 13 for outputting a signal of a size corresponding to a voltage value of an input voltage impressed on the power line L1; and a power calculation section 14. The power calculation section 14 includes: a current AC/DC separation part 14a for separating the signal output from the current detection section 12 into a DC current signal corresponding to a DC current component and an AC current signal corresponding to an AC current component, and outputting the separated signals; a voltage AC/DC separation part 14b for separating the signal output from the voltage detection section 13 into a DC voltage signal corresponding to a DC voltage component and an AC voltage signal corresponding to an AC voltage component, and outputting the separated signals; a DC power calculation part 14c for calculating a power value of the DC components from the DC current signal and the DC voltage signal; and an AC power calculation part 14e for calculating a power value of the AC components from the AC current signal and the AC voltage signal. <P>COPYRIGHT: (C)2011,JPO&INPIT |
