Load-Dependent Soft-Switching Switching Method of Half Half-Bridge Bridge Current Doubler for High-Voltage Point-of of-Load Load Converter in Data Center Power Supplies
Abstract: With the increased cloud computing and digital information storage, the energy requirement of data centers keeps increasing. A high high-voltage voltage point of load (HV POL) with an input series output parallel structure is proposed to convert 400 to 1 VDC within a single ingle stage to increase the power conversion efficiency. The symmetrical controlled half half-bridge bridge current doubler is selected as the converter topology in the HV POL. A load load-dependent soft-switching switching method has been proposed with an auxiliary circuit that inc includes ludes inductor, diode, and MOSFETs so that the hard-switching switching issue of typical symmetrical controlled half-bridge half converters is resolved. The operation principles of the proposed soft-switching soft half-bridge bridge current doubler have been analyzed in detail. Then Then,, the necessity of adjusting the timing with the loading in the proposed method is analyzed based on losses, and a controller is designed to realize the load load-dependent dependent operation. A lossless RCD current sensing method is used to sense the output inductor current cu value in the proposed load load-dependent dependent operation. Experimental efficiency of a hardware prototype is provided to show that the proposed method can increase the converter's efficiency in both heavy heavy- and light-load conditions.