Nguyen-Duy, Khiem1; Ouyang, Ziwei1; Petersen, Lars Press3; Knott, Arnold1; Thomsen, Ole Cornelius1; Andersen, Michael A. E.1
1 Department of Electrical Engineering, Technical University of Denmark2 Electronics, Department of Electrical Engineering, Technical University of Denmark3 Department of Applied Electronics, Technical University of Denmark
This paper presents the design of a medium-powerrating isolated power supply for ultra-fast tracking converters and MOS-gate driver circuits in medium and high voltage applications. The key feature of the design is its very low circuit input-to-output parasitic capacitance, which maximizes its noise immunity from noise due to fast changes in voltage. The converter is a voltage-controlled current source, utilizing a transformer with extremely low inter-winding parasitic capacitance, which is achieved by separating the windings by a significant distance. Experimental measurements show that an overall circuit input-to-output parasitic capacitance of 10 pF in a 300 W prototype can be achieved. The circuit input-to-output capacitance per watt is therefore 30 times lower than that of existing approaches. A mathematical model of the inter-winding capacitance of the proposed transformer, circuit analysis, and experimental results are provided to prove the feasibility of the converter.
I E E E Transactions on Power Electronics, 2015, Vol 30, Issue 6, p. 3319-3333
Current transformers; Parasitic capacitance; Switching converters; Stacking; Dc-dc power converters