LATCHING RELAY CONTROL CIRCUIT AND POWER METER

摘要

The present invention is provided with: a switch (SW) connected to both ends of a series circuit to which an alternating current power source (Vs) and a latching relay drive coil (L1) are connected; a voltage detection unit (341) that detects the alternating current voltage of the alternating current power source; an opening and closing signal output unit (342) that outputs an opening signal or a closing signal to the latching relay drive coil; and a switch control unit (343) that turns on the switch on the basis of a first threshold voltage value that is compared with the alternating current voltage that is detected by the voltage detection unit when the opening signal is input from the opening and closing signal output unit and a second threshold voltage value that is compared with the alternating current voltage when the closing signal is input.