JP2019503160A - 共振コンバータを制御するための制御回路及び方法、並びに共振コンバータと制御回路とを含む電力インバータ - Google Patents
共振コンバータを制御するための制御回路及び方法、並びに共振コンバータと制御回路とを含む電力インバータ Download PDFInfo
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- H02M3/00—Conversion of dc power input into dc power output
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- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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Abstract
Description
DC電圧の正電位Vpに接続されるべきハイサイドスイッチ部材、
DC電圧の負電位Vnに接続されるべきローサイドスイッチ部材、
スイッチの出力ポールVac、すなわち、共振負荷回路に接続されるべき、2つのスイッチ部材の接続点。
当初導電性の対角対の2つのスイッチ部材は、事象E1及びE3において続いてターンオフされ、
スイッチング事象E2(すなわち、第1のスイッチ部材の相補的スイッチ部材のターンオン)は、スイッチング事象E1(すなわち、第1のスイッチ部材のターンオフ)と事象E5(すなわち、共振電流のゼロ交差)との間の時間間隔T1のどの時点で生じてもよく、
スイッチング事象E4(すなわち、第2のスイッチ部材の相補的スイッチ部材のターンオン)は、スイッチング事象E3(すなわち、第2のスイッチ部材のターンオフ)と事象E5(すなわち、共振電流のゼロ交差)との間の時間間隔T2のどの時点で生じてもよい。
表1:図5の方法による半共振周期における4つの例示的なスイッチングシーケンス
A1:並列逆ダイオードが導通している間にZCSターンオンする(E4)、
A2:スイッチが、共振電流ゼロ交差で電流を伝導し始める(E5)、
A3:ZVSターンオフする(E1)、ダイオードへの伝達、
A4:並列逆ダイオードが導通している間にZCSターンオンする(E2、E4)、
A5:ZVSターンオフする(E3)、ダイオードへの伝達、
A6:スイッチが、共振電流ゼロ交差で電流を伝導し始める(E5)。
Claims (15)
- フルブリッジ構成を備える共振コンバータを制御するための制御回路であって、前記フルブリッジ構成が2つの並列スイッチングブランチを備え、前記2つのスイッチングブランチの各々が2つの直列接続されたスイッチ部材を備え、一方のスイッチングブランチのスイッチ部材と他方のスイッチングブランチのスイッチ部材とのそれぞれが対角対を形成し、前記制御回路は、
前記共振コンバータの出力電圧を制御するための電圧制御信号を供給するための出力電圧コントローラと、
前記スイッチ部材のスイッチング事象を制御するためのスイッチエンコーダと
を備え、
前記スイッチエンコーダが、前記共振コンバータの共振電流の複数の周期の各半周期の間、対角対が導通している初期状態から開始して、
前記電圧制御信号に基づいて前記対角対の第1のスイッチ部材をターンオフし、
前記第1のスイッチ部材の前記ターンオフの後、前記第1のスイッチ部材に直列接続されたスイッチ部材を、前記共振電流のゼロ交差より前にゼロ交差事象に基づいて、ターンオンし、
前記第1のスイッチ部材の前記ターンオフの後、前記対角対の第2のスイッチ部材を、前記ゼロ交差より前に前記ゼロ交差事象に基づいて、ターンオフし、
前記第2のスイッチ部材の前記ターンオフの後、前記第2のスイッチ部材に直列接続されたスイッチ部材を、前記共振電流の前記ゼロ交差事象より前に前記ゼロ交差事象に基づいて、ターンオンする、制御回路。 - 前記共振電流のゼロ交差予測事象を示すゼロ交差予測信号を供給するためのゼロ交差予測器であって、各ゼロ交差予測事象が、前記共振電流のそれぞれのゼロ交差より所定の前進時間間隔だけ進んでいる、ゼロ交差予測器をさらに備え、
前記スイッチエンコーダは、前記ゼロ交差予測信号に基づいてゼロ交差予測事象において前記第2のスイッチ部材をターンオフする、請求項1に記載の制御回路。 - 前記スイッチエンコーダが、さらに、前記ゼロ交差予測信号に基づいて、前記第1のスイッチ部材に直列接続された前記スイッチ部材をターンオンする、請求項2に記載の制御回路。
- 遅延ゼロ交差予測事象を示す第1の遅延信号を供給するための第1の遅延ユニットであって、各遅延ゼロ交差予測事象が、対応するゼロ交差予測事象より第1の所定の遅延時間だけ遅れ、前記共振電流の対応するゼロ交差より前にある、第1の遅延ユニットをさらに備え、
前記スイッチエンコーダが、さらに、前記第1の遅延信号に基づいて、前記第2のスイッチ部材に直列接続された前記スイッチ部材を遅延ゼロ交差予測事象においてターンオフする、請求項2に記載の制御回路。 - 前記第1の遅延ユニットが、前記ゼロ交差予測信号を遅延させることによって前記第1の遅延信号を供給する、請求項4に記載の制御回路。
- 前記スイッチエンコーダが、さらに、前記第1の遅延信号に基づいて、遅延ゼロ交差予測事象において前記第1のスイッチ部材に直列接続された前記スイッチ部材をターンオンする、請求項4に記載の制御回路。
- 前記第1のスイッチ部材の前記ターンオフを第2の所定の遅延時間だけ遅らせかつ前記ゼロ交差事象より前にある事象を示す第2の遅延信号を供給するための第2の遅延ユニットをさらに備え、
前記スイッチエンコーダが、さらに、前記第2の遅延信号に基づいて、前記第1のスイッチ部材に直列接続された前記スイッチ部材をターンオンする、請求項1に記載の制御回路。 - 前記第2の遅延ユニットが、前記電圧制御信号を遅延させることによって前記第2の遅延信号を供給する、請求項7に記載の制御回路。
- 前記共振電流の第1の周期において前記電圧制御信号に基づいて最初にターンオフされる前記スイッチ部材が、前記第1の周期と異なる前記共振電流の第2の周期において前記電圧制御信号に基づいて最初にターンオフされる前記スイッチ部材と異なる、請求項1に記載の制御回路。
- 前記スイッチエンコーダが、
前記ゼロ交差予測信号に基づいて鋸波信号を供給するための同期鋸波発生器と、
前記電圧制御信号及び前記鋸波信号に基づいて位相信号を供給するための比較器と、
前記位相信号に基づいて駆動信号を各スイッチ部材に供給するためのデジタルエンコーダとを備える、請求項2に記載の制御回路。 - 前記スイッチエンコーダが、
前記ゼロ交差予測信号及び前記共振電流の前記ゼロ交差に基づいて同期信号を供給するためのゼロ交差予測器と、
前記電圧制御信号及び前記同期信号に基づいて位相信号を供給するためのカウンタと、
前記位相信号に基づいて駆動信号を各スイッチ部材に供給するためのデジタルエンコーダとを備える、請求項2に記載の制御回路。 - フルブリッジ構成を備える共振コンバータを制御する方法であって、前記フルブリッジ構成が2つの並列スイッチングブランチを備え、前記2つのスイッチングブランチの各々が2つの直列接続されたスイッチ部材を備え、一方のスイッチングブランチのスイッチ部材と他方のスイッチングブランチのスイッチ部材とのそれぞれが対角対を形成し、前記方法が、前記共振コンバータの共振電流の複数の周期の各半周期の間、対角対が導通している初期状態から開始し、
電圧制御信号に基づいて前記対角対の第1のスイッチ部材をターンオフするステップと、
前記第1のスイッチ部材の前記ターンオフの後、前記第1のスイッチ部材に直列接続されたスイッチ部材を、前記共振電流のゼロ交差より前にターンオンするステップと、
前記第1のスイッチ部材の前記ターンオフの後、前記対角対の第2のスイッチ部材を、前記ゼロ交差より前にターンオフするステップと、
前記第2のスイッチ部材の前記ターンオフの後、前記第2のスイッチ部材に直列接続されたスイッチ部材を、前記共振電流のゼロ交差事象より前にターンオンするステップと
を有する、方法。 - 共振コンバータと、前記共振コンバータを制御するための請求項1に記載の制御回路とを備える電力インバータであって、
前記共振コンバータがフルブリッジ構成と共振回路とを備え、
前記フルブリッジ構成が2つの並列スイッチングブランチを備え、前記2つのスイッチングブランチの各々が2つの直列接続されたスイッチ部材を備え、一方のスイッチングブランチのスイッチ部材と他方のスイッチングブランチのスイッチ部材とのそれぞれが対角対を形成し、
前記共振回路が前記2つのスイッチングブランチの各々に属する前記2つの直列接続されたスイッチ部材の接続点間に接続された、電力インバータ。 - 前記スイッチ部材のうちの1つ又は複数が、スナバキャパシタに並列に接続される、請求項13に記載の電力インバータ。
- 請求項13に記載の電力インバータと、前記電力インバータの入力部に接続されたDC電圧源と、前記電力インバータの出力部に接続されたX線管とを備える、X線発生器。
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