| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technique of eliminating systematic errors, saving trouble required for measurement and reducing costs, in an electric power calculation apparatus. <P>SOLUTION: An electric power calculation apparatus comprises: a digital current value output unit 2 that outputs a digital current value obtained through applying first A/D conversion to a current value of output current Idc of DC power supply 1; a digital voltage value output unit 4 that outputs a digital voltage value obtained through applying second A/D conversion to a voltage value of output voltage Vdc of the DC power supply 1; and an electric power calculation unit 6 that calculates an analog current value obtained by applying first D/A conversion to the digital current value and an analog voltage value obtained by applying second D/A conversion to the digital voltage value, through input of the digital current value and the digital voltage value, and calculates an estimated value of electric power supplied from the DC power supply, based on the analog current value and the analog voltage value. The first D/A conversion is inverse conversion of third A/D conversion characteristics determined by circuit configuration of the digital current value output unit. <P>COPYRIGHT: (C)2012,JPO&INPIT |
