A Switched Capacitor and Autotransformer Hybrid Converter with DC Current in the Windings

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Abstract
This work presents a hybrid converter combining soft-charged switched capacitors and an autotransformer with DC current in the windings, optimized for 4:1 fixed voltage gain conversion (DCX) for high output current. By adding an additional output inductor, it can also regulate the output voltage to lower than of the input voltage by changing the duty cycle. The switched capacitors voltage and the two winding currents in the transformer are auto-balanced. Non-resonant operation of the circuit enables DC current in the windings and simplifies both transformer and circuit design. Experimental results for 48V-12V DCX operation achieve 98% peak efficiency and 97.8% full load (250W) efficiency. Regulation by using the output inductor is verified experimentally up to 48V-6V (8:1) voltage step down.

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