Wireless charging may have a standards battle to contend with, but there’s also a major a measurement problem. The quest for convenient living and energy conservation poses a ‘Ying/Yang’ dilemma living in the age of electronics. This is certainly the case with wireless power transfer technology. This rapidly emerging technology has the promise of “cutting the cord” and displacing the need for AC/DC wall adapters and perhaps eventually wall sockets. The question now is; will wireless power increase our carbon footprint by being less efficient than the traditional plug-in AC/DC wall adapters?” Are some wireless systems more efficient than others? These are two fundamental questions that need to be examined in an energy conscious world governed by energy efficient standards.

EETimes
August 4, 2015
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EPC garners the attention of MIT Technology Review with its new products targeted for wireless charging applications. Recognizing EPC as a catalyst for jump-starting the market for wireless power systems, the author highlights the need for universally accepted technology standards. He reinforces his position quoting Alex Lidow saying that “…convenience, cost, and efficiency” are all factors needed for broad adoption of any standard…

MIT Technology Review
July 15, 2015
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Consumers want to be able to go wirelessly where they want, when they want. They want televisions to be seamlessly synchronized with tablets, phones, laptops, and automobiles. They want all their communication, information, and entertainment to be available immediately, with high resolution, all the time. Recently the automobile industry has caught on to this trend and has begun to show its vision of the future for the fully mobile lifestyle.

Consumers also do not want to worry about running out of battery life – no more looking for an open outlet at the airport. This untethered life is the Mobility Imperative and it is driving innovation in consumer products, which in turn, is pushing the limits of silicon-based semiconductor technology.

Nikkei Business Publications
July 10, 2015
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全新氮化鎵技術推動了無綫電源傳送應用的發展。近來在A4WP及PMA的合併下，工程師們對該發展尤感興趣。 本訪問涵蓋了饒富興味的問題並解答了氮化鎵元件何時會備受半導體業界廣泛採納。訪問的內容包括氮化鎵元件的優勢、成本如何可以更低、最新元件的創新性、元件可以工作在高頻的條件下而具備小尺寸、優越的散熱管理、氮化鎵的市場如何可以超越矽元件的市場及氮化鎵技術的未來發展等。

功率系統設計
2015年6月24日
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氮化鎵場效應電晶體（eGaN^® FET）之前在鬆散耦合式無綫電源傳送解決方案中，展示了在採用零電壓開關(ZVS)D類或E類放大器拓撲並工作在on-resonance條件下，該些電晶體具有較高的效率。然而，可行的無綫電源系統需要滿足這些系統的易用性的要求，結果是反射式綫圈阻抗在負載和耦合變化時顯著偏離諧振。由於這些系統仍然需要向負載供電，因此放大器需要在寬阻抗範圍內驅動綫圈。諸如A4WP第三等級的規範定義了可以滿足易用性因素、寬泛的綫圈阻抗範圍，並且可以用作比較放大器的性能的起點。

本章根據A4WP第三等級的標準對ZVS D類及E類放大器拓撲在6.78MHz頻率下進行測試並通過縮小了的阻抗範圍來判斷固有的工作範圍極限。諸如元件的溫度和電壓極限等因素將確定每個放大器能够驅動綫圈的負載阻抗範圍。

Bodos China
宜普電源轉換公司應用工程執行總監Michael de Rooij博士
2015年6月
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從業界的觀點來看，只有可以爲人類提供效益及性能優勢的技術才能够生存。 主流技術CMOS就是一直爲業界提供無比的益處而得以長存。 當下的問題是CMOS技術將會變成夕陽産業嗎？新興的氮化鎵技術終於能够打破阻礙氮化鎵功率元件普及化的成本障礙。根據2015年DesignCon研討會的主講嘉賓所描述，氮化鎵技術可推動寬泛範圍的新興應用的發展，包括從無綫充電、全自動汽車以至更高效的移動通訊等應用。

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EETimes Asia
2015年2月

Practical wireless power systems need to address the convenience factor of such systems. Standards such as the A4WP Class 3 have defined a broad coil impedance range that address the convenience factor and can be used as a starting point to compare the performance of the amplifiers. In this installment of WiGaN both the ZVS Class-D and Class-E amplifiers will be tested at 6.78 MHz to the A4WP Class 3 standard.

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在過去幾年間，無線電源傳送應用逐漸流行，尤其是替可擕式裝置充電的應用。宜普公司在本章討論使用鬆散耦合線圈、高度諧振的無線電源解決方案，符合A4WP標準並適合工作在免執照、給工業、科學及醫療用電器設備（ISM）使用的6.78 MHz或13.56 MHz頻率。

雜誌：Bodo’s Power Systems
作者：Alex Lidow博士及Michael De Rooij博士
2014年5月

EPC公司Michael de Rooij與Power Systems Design 雜誌編輯Alix Paultre分享無線電源傳送解決方案

Power Systems Design雜誌
2014年3月
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Enhancement-mode gallium nitride transistors have been commercially available for over four years and have infiltrated many applications previously monopolized by the aging silicon power MOSFET. There are many benefits derived from the latest generation eGaN® FETs in new emerging applications such as highly resonant wireless power transfer, RF envelope tracking, and class-D audio. This article will examine the rapidly evolving trend of conversion from power MOSFETs to gallium nitride transistors in these new applications.

Power Pulse
By: Alex Lidow
February, 2014

本章展示氮化鎵場效應電晶體如何推動具高度諧振、鬆散耦合性、工作在6.78 MHz ISM頻帶的無線電源傳送技術，實現高效無線能源傳送，並與工程師分享使用電壓模式D類及E類方法的範例。

EEWeb
作者：Alex Lidow
日期：2014年1月

增強型氮化鎵場效應電晶體商用化已經超過四年，並不斷滲透及進駐本來被矽功率MOSFET器件所壟斷的應用領域。

Power Pulse
作者：Alex Lidow
2013年10月

With the introduction of this family of eGaN® FETs, power systems and RF designers now have access to high performance gallium nitride power transistors enabling innovative designs not achievable with silicon.

October, 2013
Bodo's Power Systems

雜誌：EDN Europe
日期：２０１３年３月

本文解構組裝無線電源傳送系統所需的元件。宜普電源轉換公司的EPC9104演示系統展示了高效無線電源傳送系統所需的高頻、高壓及高功率器件。詳情請瀏覽http://mag.electronics-eetimes.com/EDNE_MARCH_2013/#/26/。

雜誌：Bodo’s Power Systems (www.bodospower.com)
日期：1/2/2013
作者：宜普公司首席執行長Alex Lidow博士、應用工程執行總監Michael deRooij博士及應用工程 總監David Reusch博士
摘要：本文展示了增強型氮化鎵場效應電晶體推動諧振拓撲在效率方面實現重大改善，以及工作 在6.78 MHz頻率範圍的無線電源傳送實用範例。

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作者：宜普公司產品應用副總裁Michael de Rooij博士
日期：在2012年6月27日刊載於Power Electronics Technology 雜誌

無線電源產品的應用日益普遍，尤其是應用於通用產品如手機充電器。作為MOSFET技術的替代產品，增強型氮化鎵電晶體具備更快開關速度的性能，是無線電源應用的理想器件。這篇文章我們主要討論實驗性的評估一個內含氮化鎵場效應電晶體在6.78 MHz時工作的無線充電系統的感應線圈，適合用於多個輸出功率為5W的U盤充電負載。

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