Patent ID: 7123491

Claim:
A converting device for converting an alternate current to a direct current, comprising: a converter, provided with a switching regulator, for converting an alternate current to a direct current; a plurality of filters, provided on an alternate current side of the converter, for filtering a conducted noise generated at the converter, the filters having filtering performances different from each other; a filter switcher for switching the filter to be used in the converting device among the plurality of filters; a detector for detecting one of a plurality of different power consumption states of an electrical apparatus connected to the converting device; a storage for storing correlations between the power consumption states of the electrical apparatus and the filters to determine the filter which meets requirements that the conducted noise to be filtered in the converting device is suppressed to a standard limit value or less, and power consumption is made lowest among the filters; and a filter switching controller for acquiring the power consumption state of the electrical apparatus detected by the detector, and reading out, from the storage, the filter which meets the requirements that the conducted noise to be filtered in the converting device is suppressed to the standard limit value or less and the power consumption is made lowest among the filters to control the filter switcher to switch over the filter to be used in the converting device to the readout filter.