DC/DC CONVERTER FOR REMOVING AUDIBLE FREQUENCY NOISE

摘要

PURPOSE: A DC/DC converter is provided to stabilize an operation and to improve a reliability thereof by an audible frequency noise generated therein. CONSTITUTION: A DC/DC circuit (10) receives a direct voltage of a predetermined level and outputs a direct voltage of other level. A band pass filter (BPF, 14) filters signals of other frequency band excluding high frequency signals of a predetermined band among signals outputted by the DC/DC circuit. An inverter (16) inverts a phase of a signal outputted from the band pass filter. A coupler (12) mixes outputs of the DC/DC circuit with outputs of the inverter, and offsets an audible frequency signal, so as to output a direct voltage.