| 摘要 |
Provided is a field device capable of carrying out communication with high power efficiency. The field device comprises a wireless circuit (14) for carrying out wireless communication, an analog signal input unit (13) to which an analog signal is inputted, at least one capacitor (21) provided to supply power to the wireless circuit (14), a power supply circuit (15) provided to charge the capacitor (21) on the basis of the analog signal, a measuring circuit (16) connected in series to the power supply circuit (15), a switch unit (23) for switching between a first (charge) state and a second (discharge) state, and a switch control circuit (20) for controlling the switch unit (23) to intermittently carry out the switching. In the first (charge) state, the capacitor (21) is connected in parallel to the power supply circuit (15), and in the second (discharge) state, the capacitor (21) is connected in parallel to the wireless circuit (14). |
