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A novel bi-directional buck-boost converter used for battery charging and discharging cooperated with a three-level half bridge inverter in a UPS is proposed. The operation of charging and discharging can be controlled respectively, and the capacitor voltage balance can be achieved based on the peak current control. The operating principle and parameter design of the converter are analyzed in detail...
In this paper, a current sharing control strategy based on average current principle is proposed for power factor correction (PFC) converters operating in parallel. When paralleling, as the boost PFC converter is non-isolation, the input current must be sensed by transformers to realize power factor correction. At the same time, the parallel system requires current sharing to achieve favorable performance...
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