Title :
A High-Efficiency Positive Buck–Boost Converter With Mode-Select Circuit and Feed-Forward Techniques
Author :
Jiann-Jong Chen ; Pin-Nan Shen ; Yuh-Shyan Hwang
Author_Institution :
Dept. of Electron. Eng., Nat. Taipei Univ. of Technol., Taipei, Taiwan
Abstract :
This paper presents a high-efficiency positive buck- boost converter with mode-select circuits and feed-forward techniques. Four power transistors produce more conduction and more switching losses when the positive buck-boost converter operates in buck-boost mode. Utilizing the mode-select circuit, the proposed converter can decrease the loss of switches and let the positive buck-boost converter operate in buck, buck-boost, or boost mode. By adding feed-forward techniques, the proposed converter can improve transient response when the supply voltages are changed. The proposed converter has been fabricated with TSMC 0.35-μm CMOS 2P4M processes. The total chip area is 2.59 × 2.74 mm2 (with PADs), the output voltage is 3.3 V, and the regulated supply voltage range is from 2.5-5 V. Its switching frequency is 500 kHz and the maximum power efficiency is 91.6% as the load current equals 150 mA.
Keywords :
CMOS integrated circuits; feedforward; power convertors; power transistors; transient response; TSMC CMOS 2P4M process; current 150 mA; feed-forward technique; frequency 500 kHz; mode-select circuit; positive buck-boost converter; power transistor; size 0.35 mum; transient response; voltage 2.5 V to 5 V; voltage 3.3 V; Batteries; Educational institutions; Inductors; Power transistors; Switches; Switching loss; Voltage control; Feed-forward techniques; mode select; positive buck–boost converter;
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2012.2223718
