| 摘要 |
<P>PROBLEM TO BE SOLVED: To allow a user to confirm at any time how long and how much an input power voltage is stepped down to cause a voltage supplied to a load system to approach a target voltage when a step-down power-receiving system is actually running. <P>SOLUTION: A step-down power-receiving system inputs into a transformer an AC power source conducted to a power consumer; automatically switches a transformation ratio of the transformer to cause an output voltage of the transformer to approach a target voltage which is set lower than the rated voltage of the AC power source; and supplies the output of the transformer to a load system. Changes in the time series of the transformation ratio mode are made into digital data and recorded as a transformation log, and monitoring information indicating at least one of the running time and the running time proportion for each transformation ratio mode in a predetermined period is produced and output on the basis of the transformation log. <P>COPYRIGHT: (C)2013,JPO&INPIT |
