| Presentation | 2016-05-13 LCL Measurement Method Based on Equivalent Circuit Modeling Tohlu Matsushima, Kazuhiro Takaya, Yuichiro Okugawa, Ken Okamoto, Akira Sugiura, Osami Wada, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In order to measure LCL (longitudinal conversion loss) of an equipment under test (EUT) or a circuit with high symmetry, an extremely-symmetric differential mode choke coil is necessary. However, it is difficult to manufacture the differential mode choke coil because a coupling coefficient cannot be fixed to 1 and asymmetry of the two inductances cannot be eliminated. In this report, an equation for LCL calculation is derived, including the coupling coefficient and inductances of the differential mode choke coil. By using the derived equation, estimation error of LCL caused by the coupling coefficient and the inductance ratio is discussed. In addition, a new evaluation method of LCL is proposed. In this method, parameters of an equivalent circuit model for EUT are extracted by S parameter measurement using a vector network analyzer. After extracting these parameters, the LCL can be calculated by the equation derived under an assumption that the differential mode choke coil is ideal. To validate the proposed method, the LCL of an impedance stabilization network is measured, and the result obtained by the proposed method is in good agreement with that of the conventional method using an LCL probe up to 5 MHz. Advantages of the proposed method are simple measurement, having high accuracy and applicability up to high frequency. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Longitudinal conversion loss(LCL) / S parameter measurement / T equivalent circuit / Impedance stabilization network(ISN) |
| Paper # | EMCJ2016-12 |
| Date of Issue | 2016-05-06 (EMCJ) |
| Conference Information | |
| Committee | EMCJ |
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| Conference Date | 2016/5/13(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Hokkaido University |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Power Electronics, EMC |
| Chair | Hideaki Sone(Tohoku Univ.) |
| Vice Chair | Osami Wada(Kyoto Univ.) |
| Secretary | Osami Wada(Okayama Univ.) |
| Assistant | Atsuhiro Takahashi(Toyota Central R&D Labs.) / Yoshiki Kayano(Akita Univ.) / Yusaku Katsube(Hitachi) |
| Paper Information | |
| Registration To | Technical Committee on Electromagnetic Compatibility |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | LCL Measurement Method Based on Equivalent Circuit Modeling |
| Sub Title (in English) | |
| Keyword(1) | Longitudinal conversion loss(LCL) |
| Keyword(2) | S parameter measurement |
| Keyword(3) | T equivalent circuit |
| Keyword(4) | Impedance stabilization network(ISN) |
| 1st Author's Name | Tohlu Matsushima |
| 1st Author's Affiliation | Kyoto University(Kyoto Univ.) |
| 2nd Author's Name | Kazuhiro Takaya |
| 2nd Author's Affiliation | Nippon Telegraph and Telephone Corporation(NTT) |
| 3rd Author's Name | Yuichiro Okugawa |
| 3rd Author's Affiliation | Nippon Telegraph and Telephone Corporation(NTT) |
| 4th Author's Name | Ken Okamoto |
| 4th Author's Affiliation | Nippon Telegraph and Telephone Corporation(NTT) |
| 5th Author's Name | Akira Sugiura |
| 5th Author's Affiliation | Kyoto University(Kyoto Univ.) |
| 6th Author's Name | Osami Wada |
| 6th Author's Affiliation | Kyoto University(Kyoto Univ.) |
| Date | 2016-05-13 |
| Paper # | EMCJ2016-12 |
| Volume (vol) | vol.116 |
| Number (no) | EMCJ-26 |
| Page | pp.pp.17-22(EMCJ), |
| #Pages | 6 |
| Date of Issue | 2016-05-06 (EMCJ) |