7.3. Buck–Boost (Step-Down–Step-Up) DC–DC Converter
The buck–boost converter, presented in Fig. 7.11(a), can generate a dc output voltage that can be either higher or lower than the input voltage. Therefore, this converter can operate as a buck or a boost converter depending on the needs of the output voltage. Fig. 7.11(b)–(d) present the equivalent circuits of the three modes of operation while Fig. 7.12 presents different key waveforms of the converter when the inductor current is continuous. The operation of the buck–boost converter can be divided into the following three modes:
Mode I (Inductor charging): During this mode the semiconductor switch S is conducting and according to the equivalent circuit of Fig. 7.11(b) the inductor is in the ...
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