To prevent electrodes from biasing to one polarity in an apparatus mounting an ion elution unit which elutes metal ion by applying voltage between the electrodes.
A washing machine 1 is provided with the ion elution unit 100 which elutes metal ion by applying voltage between the electrodes and the driving circuit 120 of the ion elution unit 100. In order to drive the ion elution unit 100, the driving circuit 120 measures a time of voltage application by each polarity while inverting the polarities of the electrodes during a set time. When power cut-off operation is carried out before the end of the set time, the driving circuit 120 compares the time of voltage application of each polarity from the start of the set time until the time point of the stoppage of the voltage application to find a time difference, stores the time difference and a polarity whose time of the voltage application is shorter in a nonvolatile memory 175 as compensation operation data and thereafter, carries out power cut-off operation. In the next operation, the driving circuit 120 makes the ion elution unit carry out compensation operation based on the compensation operation data and thereafter, makes the unit shift to normal set operation.
Shigeki Yamada
Junji Kodera