A new digital control DC-DC converter with boundary current control

The purpose of this paper is to present a new digital control boundary current mode buck-boost dc-dc converter. This buck boost dc-dc converter is in intended for use as a low power application, such as the household power and the PHV. The buck-boost dc-dc converter is widely used in the energy management field, because it has capability to obtain the wide input range characteristic. However, it also has the disadvantage likely to be unstable system. On the other hand, the dc-dc converter that operates in a boundary current mode has the some advantages. This has capability to achieve high efficiency and low switching noise is expected in the low power application. In this paper, the boundary current control operation is performed based one the predicted zero cross points.