| 摘要 |
PROBLEM TO BE SOLVED: To provide a measuring apparatus capable of accurately measuring a true value of electric current or voltage as a measuring object, and to provide a charging apparatus including the measuring apparatus.SOLUTION: The measuring apparatus 1 comprises an amplifier section 2 and a true value calculation section 3. The amplifier section 2 includes an analog input signal amplifier circuit 4 for amplifying an analog input signal Sto generate an analog amplification signal S, a triangular wave signal generating circuit 5 for generating a triangular wave signal S, a PWM signal generating circuit 6 for generating a PWM signal Son the basis of the analog amplification signal Sand triangular wave signal S, and a filter circuit 7 for converting the PWM signal Sinto an analog output signal S. The true value calculation section 3 includes a storage circuit 8 in which initial relation data is stored in advance, a relation data generating circuit 9 for generating current relation data, and an arithmetic circuit 10 for calculating a true value on the basis of the current relation data. |
