MPS vs. O2

Monolithic Power Systems, Inc.(MPS)在與O2的一案專利訴訟案中，大獲全勝，二案的系爭專利均為：US6,396,722號專利。

加州北區聯邦地方法院的判決
O2在加州北區聯邦地方法院起訴MPS及其客戶侵權侵害其所擁有的US6,396,722號專利，但該專利的所有申請專利範圍，都被判定不具有創造性而被宣告無效，O2的專利侵害案亦因此敗訴。

德州東區地方法院判決
O2同時亦在德州聯邦東區地方法院起訴使用MPS產品的台灣勝美達電子公司，該案因系爭專利未被判定無效，因此O2獲勝，但，勝美達電子提起上訴。

聯邦巡迴上訴法院判決
1.第一案維持加州北區聯邦地方法院的判決確定。
2.第二案因系爭專利己被判決無效，而推翻德州聯邦東區地方法院原判決，改判勝美達電子勝訴。

US6,396,722號專利
Title:High-efficiency adaptive DC/AC converter
Filing date:2007.5.7.
Issue date:2008.5.28.
Abstract:
A CCFL power converter circuit is provided using a high-efficiency zero-voltage-switching technique that eliminates switching losses associated with the power MOSFETs. An optimal sweeping-frequency technique is used in the CCFL ignition by accounting for the parasitic capacitance in the resonant tank circuit. Additionally, the circuit is self-learning and is adapted to determine the optimum operating frequency for the circuit with a given load. An over-voltage protection circuit can also be provided to ensure that the circuit components are protected in the case of open-lamp condition.