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<div id="wrapper"><table width="700" border="1" align="center">  <tr>       <td bgcolor="#CCCCFF" class="title">SS2-5　Study of Influence of Magnetic Flux on Semiconductor Switches in High-Power-Density Isolated DC-DC Converter</td>     </tr>     <tr>       <td class="chosha">◎Tomoya Koga，Akinori Hariya，Yudai Mizoguchi，Yoichi Ishizuka（Nagasaki University），Ken Matsuura（TDK Corporation），Hiroshige Yanagi，Satoshi Tomioka（TDK-Lambda Corporation），Tamotsu Ninomiya（Asian Growth Research Institute）</td>     </tr>     <tr>       <td class="abst">In the structure of high-power-density isolated dc-dc converter, the components are placed close to each other. Therefore, the mutual effects of the components are needed to take into account. Also, lateral-structure semiconductor switches are widely used to reduce power losses of switching in the MHz level. However they are affected by the magnetic flux. In this paper, the influence of magnetic flux on the semiconductor switches has been revealed. As a measure of the problem, the using a magnetic shield has been proposed, and the effects have been confirmed. The electromagnetic field simulation with Maxwell 3D and some experiments have been done with the prototype 5MHz and 32W/cc unregulated LLC resonant dc-dc converter using GaN-HEMTs.</td>     </tr> </table></div>
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