簡易MPPT機能を有する熱発電腕時計用可変段数型スイッチトキャパシタ昇圧回路

カテゴリ: 論文誌(論文単位)

グループ名: 【C】電子・情報・システム部門

発行日: 2013/02/01

タイトル(英語): Variable-stage Switched Capacitor-type DC-DC Converter for Thermoelectrically-powered Wristwatch with Simple MPPT Function

著者名: 宇都宮　文靖（立命館大学／セイコーインスツル（株）），吉田　宜史（セイコーインスツル（株）），道関　隆国（立命館大学）

著者名(英語): Fumiyasu Utsunomiya (Ritsumeikan University/Seiko Instruments Inc.), Yoshifumi Yoshida (Seiko Instruments Inc.), Takakuni Douseki (Ritsumeikan University)

キーワード: エネルギー・ハーベスト回路，DC-DCコンバータ，スイッチトキャパシタ，熱電変換素子，MPPT，腕時計　　Energy harvesting circuit，DC-DC converter，Switched-capacitor，Thermoelectric element，MPPT，Wristwatch

要約(英語): A DC-DC converter scheme for thermoelectrically powered wristwatch is described. The converter consists of a variable-stage switched-capacitor (SC) circuit, a clock circuit, and a control circuit. The converter boosts the output voltage of thermoelectric (TE) generator that outputs a voltage of over 0.25V and supplies the generating power to a rechargeable battery with a voltage of 1.3V. A simple maximum-power-point-tracking technique makes it possible to extract power, which is close to maximum power, from the TE generator with a large internal resistance of 1.2kΩ. The maximum power point was automatically obtained by detecting the output open voltage of the variable-stage SC circuit and also by selecting the stage of multi-stage SC circuits. To verify the effectiveness of our converter, we fabricated a prototype with a 0.6μm CMOS process and measured the power extracted from a TE generator. The power extraction efficiency to the converter is 89% and the total conversion efficiency of the power supply module is 29%.

本誌: 電気学会論文誌C（電子・情報・システム部門誌） Vol.133 No.2 （2013） 特集：省電力時代の電子回路技術

本誌掲載ページ: 226-233 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejeiss/133/2/133_226/_article/-char/ja/