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Hybrid Buck-Boost Feedforward and Reduced Average Inductor Current Techniques in Fast Line Transient and High-Efficiency Buck-Boost Converter

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Fig. 2. Buck–boost converter implemented by discrete components contains two dc–dc converters.
Fig. 3. (a) Topology of H-bridge for the buck–boost converter and (b) energy- energy-delivering path and inductor current waveform of the conventional design.
Fig. 4. Output voltage, the inductor current waveform, and the energy- energy-delivering path when the buck–boost converter operates in (a) mode I and mode II and (b) mode III and mode IV.
Fig. 6. Frequency response of the buck–boost converter with PID compensa- compensa-tion to extend the system bandwidth.
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