| Title |
Output Estimation Method Considering Parasitic Capacitance of a High-Voltage Application DCM Series Resonant Converter |
| Authors |
Pyeong-Kang Kim ; Seung-Ho Song |
| DOI |
https://doi.org/10.5207/JIEIE.2026.40.2.104 |
| Keywords |
Cathode power supply; Discontinuous conduction mode; Floated power supply; Indirect sensing; Series resonant converter |
| Abstract |
This paper proposes a method for estimating the output voltage and current of a series resonant converter (DCM-SRC) operating in discontinuous conduction mode (DCM) for high-voltage applications, considering parasitic components. Cathode power supplies used in high-voltage systems have output terminals that float at high voltage potentials of several tens of kV without ground connection, and thus utilize double-insulated transformers for high-voltage isolation. In this case, the parasitic capacitance between the transformer windings appears large, and error correction for this is required during indirect measurement and output estimation. To solve these problems, this paper proposes an output estimation method that minimizes the error caused by the parasitic capacitance of a cathode power supply. A DCM-SRC with current source output was used as a cathode power supply, and an output estimation equation was derived based on an operation mode analysis considering parasitic components to minimize the estimation error. To validate the output estimation equation, a cathode power supply with a rated output of 20 V and 20 A was designed. The proposed estimation equation was validated through simulations. The proposed estimation method achieved an average error rate of 0.36% for voltage estimation and 0.74% for current estimation under various output conditions. This validates the validity of the proposed estimation method. |