METHOD OF DETECTING LOAD CURRENT

摘要

In order to increase the capacity of an electric load by relatively accurately detecting an operating current flowing in the electric load without a delay and setting a preset value, at which the supply of power to the load is cut, to be close to an permissible current value, this invention includes a current transformer for detecting a current flowing in the load, an A/D converting section for converting an output voltage from the secondary side of the current transformer into digital data, and a calculating section for obtaining the average value of the digital data, whereby a current value corresponding to the average value is output as a current flowing in the load.