Cascade transformerless converter for a decentralized electric power supply system

The operation of a channel-type cascade transformerless converter (CTC) designed to supply independent laboratory systems is examined. The present paper considers a new type of channel CTC with different stage conversion frequencies, this CTC has improved size and weight characteristics and can be used to design. Secondary power supply systems. With a reduced conductive pulse interference level. The proposed CTC consists of series stages each of which is a parallel configuration of two identical channels operating in antiphase. Here Ups and r are the primary dc power supply voltage and its internal resistance, respectively, and K11, K11′, K12, and K12′ are controllable charge switches. Each channel contains a storage/divider circuit (SDC), which employs series charging of the capacitor bank from the primary power supply followed by parallel discharge into the load. The timing diagrams illustrating the operation of the CTC are given.