JPWO2020004030A1 - 制御システム、スイッチシステム、電力変換装置、双方向スイッチ素子の制御方法及びプログラム - Google Patents
制御システム、スイッチシステム、電力変換装置、双方向スイッチ素子の制御方法及びプログラム Download PDFInfo
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Abstract
Description
以下では、実施形態に係る制御システム100を備えるスイッチシステム200について、図1A及び1Bに基づいて説明する。
(1.1)双方向スイッチ素子の構成
双方向スイッチ素子1は、基板2と、第1の窒化物半導体層4と、第2の窒化物半導体層5と、第1のソース電極S1と、第1のゲート電極G1と、第2のゲート電極G2と、第2のソース電極S2と、第1のp型窒化物半導体層61と、第2のp型窒化物半導体層62と、を備える。
以下では、説明の便宜上、第1のゲート電極G1と第1のソース電極S1との間に第1の閾値電圧以上の電圧が印加されていない状態を、第1のゲート電極G1がオフ状態ともいう。また、第1のゲート電極G1と第1のソース電極S1との間に第1のゲート電極G1を高電位側として第1の閾値電圧以上の電圧が印加されている状態を、第1のゲート電極G1がオン状態ともいう。また、第2のゲート電極G2と第2のソース電極S2との間に第2の閾値電圧以上の電圧が印加されていない状態を、第2のゲート電極G2がオフ状態ともいう。また、第2のゲート電極G2と第2のソース電極S2との間に第2のゲート電極G2を高電位側として第2の閾値電圧以上の電圧が印加されている状態を、第2のゲート電極G2がオン状態ともいう。
制御システム100は、図1Aに示すように、制御部101を備える。制御システム100は、制御部101の他に、第1のゲート駆動回路102と、第2のゲート駆動回路103と、を備える。制御システム100は、例えば、図1Aに示すように、双方向スイッチ素子1の第1のソース電極S1と第2のソース電極S2との間に、交流電源211と負荷212との直列回路が接続されている状態で使用される。
以上説明した実施形態等から本明細書には以下の態様が開示されている。
2 基板
4 第1の窒化物半導体層
5 第2の窒化物半導体層
61 第1のp型窒化物半導体層
62 第2のp型窒化物半導体層
G1 第1のゲート電極
G2 第2のゲート電極
S1 第1のソース電極
S2 第2のソース電極
100、100a、100b、100c 制御システム
101、101a、101b、101c 制御部
111 遅延回路
200、200a、200b、200c スイッチシステム
300b、300c 電力変換装置
Δt 時間差
Claims (10)
- 双方向スイッチ素子を制御する制御システムであって、
前記双方向スイッチ素子は、
基板と、
前記基板上に形成された第1の窒化物半導体層と、
前記第1の窒化物半導体層上に形成されており、前記第1の窒化物半導体層よりもバンドギャップの大きな第2の窒化物半導体層と、
前記第2の窒化物半導体層上に形成されている第1のソース電極、第1のゲート電極、第2のゲート電極、及び第2のソース電極と、
前記第1のゲート電極と前記第2の窒化物半導体層との間に介在している第1のp型窒化物半導体層と、
前記第2のゲート電極と前記第2の窒化物半導体層との間に介在している第2のp型窒化物半導体層と、を備え、
前記制御システムは、制御部を備え、
前記制御部は、前記双方向スイッチ素子をターンオンさせる場合、前記第1のゲート電極又は前記第2のゲート電極であって前記第1のソース電極と前記第2のソース電極とのうち低電位側のソース電極に対応するゲート電極に閾値電圧以上の電圧を印加する第1タイミングと、高電位側のソース電極に対応するゲート電極に閾値電圧以上の電圧を印加する第2タイミングと、に時間差を生じさせるように前記双方向スイッチ素子を制御する、
制御システム。 - 前記制御部は、前記第1タイミングと前記第2タイミングとの間の期間に、前記双方向スイッチ素子をダイオードとして動作させ、
前記双方向スイッチ素子は、前記ダイオードとして動作するとき、前記第1のソース電極と前記第2のソース電極とのうち相対的に電位の低いソース電極から相対的に電位の高いソース電極へ電流を流さず、かつ相対的に電位の高いソース電極から相対的に電位の低いソース電極へ電流を流す、
請求項1に記載の制御システム。 - 前記時間差は、50nsec以上である、
請求項1又は2に記載の制御システム。 - 前記基板は、前記第1のソース電極、前記第2のソース電極、前記第1のゲート電極及び前記第2のゲート電極の全てに対して電気的に絶縁されている、
請求項1〜3のいずれか一項に記載の制御システム。 - 前記制御部は、前記時間差を生じさせる遅延回路を含む、
請求項1〜4のいずれか一項に記載の制御システム。 - 前記制御部は、前記双方向スイッチ素子をターンオフさせる場合、前記双方向スイッチ素子をダイオードとして動作させない、
請求項1〜5のいずれか一項に記載の制御システム。 - 請求項1〜6のいずれか一項に記載の制御システムと、前記双方向スイッチ素子と、を備える、
スイッチシステム。 - 請求項7に記載のスイッチシステムを備える、
電力変換装置。 - 双方向スイッチ素子の制御方法であって、
前記双方向スイッチ素子は、
基板と、
前記基板上に形成された第1の窒化物半導体層と、
前記第1の窒化物半導体層上に形成されており、前記第1の窒化物半導体層よりもバンドギャップの大きな第2の窒化物半導体層と、
前記第2の窒化物半導体層上に形成されている第1のソース電極、第1のゲート電極、第2のゲート電極、及び第2のソース電極と、
前記第1のゲート電極と前記第2の窒化物半導体層との間に介在している第1のp型窒化物半導体層と、
前記第2のゲート電極と前記第2の窒化物半導体層との間に介在している第2のp型窒化物半導体層と、を備え、
前記双方向スイッチ素子をターンオンさせる場合、前記第1のゲート電極又は前記第2のゲート電極であって前記第1のソース電極と前記第2のソース電極とのうち低電位側のソース電極に対応するゲート電極に閾値電圧以上の電圧を印加する第1タイミングと、高電位側のソース電極に対応するゲート電極に閾値電圧以上の電圧を印加する第2タイミングと、に時間差を生じさせるように前記双方向スイッチ素子を制御する、
双方向スイッチ素子の制御方法。 - 基板と、
前記基板上に形成された第1の窒化物半導体層と、
前記第1の窒化物半導体層上に形成されており、前記第1の窒化物半導体層よりもバンドギャップの大きな第2の窒化物半導体層と、
前記第2の窒化物半導体層上に形成されている第1のソース電極、第1のゲート電極、第2のゲート電極、及び第2のソース電極と、
前記第1のゲート電極と前記第2の窒化物半導体層との間に介在している第1のp型窒化物半導体層と、
前記第2のゲート電極と前記第2の窒化物半導体層との間に介在している第2のp型窒化物半導体層と、を備える双方向スイッチ素子を制御するコンピュータシステムに、
前記双方向スイッチ素子をターンオンさせる場合、前記第1のゲート電極又は前記第2のゲート電極であって前記第1のソース電極と前記第2のソース電極とのうち低電位側のソース電極に対応するゲート電極に閾値電圧以上の電圧を印加する第1タイミングと、高電位側のソース電極に対応するゲート電極に閾値電圧以上の電圧を印加する第2タイミングと、に時間差を生じさせる遅延処理を実行させる、
ためのプログラム。
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