Abstract
A peak-current-controlled non-inverting buck---boost converter with a mode selection scheme for a single Ni---MH cell battery operation is proposed. In order to extend the run time of a Ni---MH battery, the proposed mode selection circuit automatically puts the converter into a buck, boost, or buck---boost mode by comparing the input and output voltages. Among the three modes, the operation range of the buck---boost mode is designed to be minimized since its power conversion efficiency is lowest. The proposed mode selection circuit is applicable to peak-current control and variable output voltage converters. The frequency compensation circuit is designed to guarantee a sufficient phase margin for all three modes. The proposed converter is implemented in a 0.18 µm CMOS technology, and the chip area is 2.31 mm2. The experimental results show that the maximum power conversion efficiency of the proposed non-inverting buck---boost converter is enhanced to 88 % from 76 % which is that of the conventional non-inverting buck---boost converter.
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