دانلود رایگان مقاله A High Efficiency Positive Buck–Boost Converter With Mode Select Circuit and Feed-Forward Techniques
IEEE TRANSACTIONS ON POWER ELECTRONICS
A High-Efficiency Positive Buck–Boost Converter With Mode-Select Circuit and Feed-Forward Techniques
This paper presents a high-efficiency positive buck– boost converter with mode-select circuits and feed-forward techniques. Four power transistors producemore conduction andmore switching losseswhen 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.
Index Terms—Feed-forward techniques, mode select, positive buck–boost converter.
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