7.5. Switched–Mode Power Supplies

A switched-mode power supply (SMPS) is a power electronics topology, which consists of two power stages. The first stage converts the ac supply into dc and the second stage converts the dc voltage to the desired dc output voltage. Figs. 7.15 and 7.16 present the block diagram of the SMPS. Today the SMPSs provide power to the following equipment:
• Electronic circuits power supply systems
• Computer power supply systems
• Uninterruptible power supply systems
• Power supply systems for telecommunication systems
The SMPSs are mainly divided into the isolated and the nonisolated topologies.
The ohmic isolated SMPS uses a high-frequency transformer that provides an ohmic isolation between the input voltage source and the ...

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