WIRELESS POWER RECEPTION DEVICE

To improve the rectification efficiency of a wireless power reception device for receiving power from a power transmission device in a contactless manner.SOLUTION: A wireless power reception device 10 includes a resonance circuit 13 having a power reception coil L and a capacitor C, a synchronous re...

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Bibliographische Detailangaben
Hauptverfasser: TANAKA JUNJI, IDO HIROSHI
Format: Patent
Sprache:eng ; jpn
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Beschreibung
Zusammenfassung:To improve the rectification efficiency of a wireless power reception device for receiving power from a power transmission device in a contactless manner.SOLUTION: A wireless power reception device 10 includes a resonance circuit 13 having a power reception coil L and a capacitor C, a synchronous rectification circuit 12 for rectifying the incoming AC power output from a resonance circuit 13, a control unit 15 for controlling driving of switching elements Q1 to Q4 of the synchronous rectification circuit 12, and a current detecting unit 14 for detecting a resonance current generated in the resonance circuit 13. The control unit 15 comprises a waveform prediction unit 16 that predicts the next zero-crossing point of the actual current waveform of the resonant current before the actual current waveform of the resonant current reaches the next zero-crossing point based on the value of the resonant current detected by the current detecting unit 14. The waveform prediction unit is configured to switch the driving states of the switching elements Q1 to Q4 at a predicted next zero-crossing point.SELECTED DRAWING: Figure 1 【課題】 本開示は、非接触により送電装置から電力を受電するワイヤレス受電装置の整流効率を向上する。【解決手段】 ワイヤレス受電装置10は、受電コイルLとコンデンサCとを有する共振回路13と、共振回路13が出力する受電交流電力を整流する同期整流回路12と、同期整流回路12のスイッチング素子Q1~Q4の駆動制御を行う制御部15と、共振回路13に生じる共振電流を検出する電流検出部14とを有する。制御部15は、電流検出部14による共振電流の検出値に基づいて共振電流の実際の電流波形が次のゼロクロス点に至る前に共振電流の実際の電流波形の次のゼロクロス点を予測する電流波形予測部16を備え、予測した次のゼロクロス点でスイッチング素子Q1~Q4の駆動状態を切り換えるよう構成されている。【選択図】図1