新方式デルタ・シグマ変調器を組み込んだ降圧形DC/DC コンバータ

－スイッチングノイズ低減特性－

抄録

This paper presents the non-isolated step-down (buck) type switched mode DC-DC converter prototype operating under a principle of advanced delta-sigma modulation processing circuit, which is based upon double stage cascade delta-sigma modulation strategy developed by the authors. The switching noise level reduction characteristics of the delta-sigma modulated DC-DC converter mentioned above are illustrated and discussed as compared with those of buck DC-DC converter prototype operating under the conditions of conventional carrier-based PWM one in addition to a one-stage delta-sigma modulation control scheme. Of these, it is particularly noted that the switching noise peaks vs. frequency characteristics of two-stage delta-sigma modulation processor-based buck DC-DC converter treaded here are more superior and effective from a practical point of view.