宇阳科技谐振MLCC在大功率无线充电器中的应用,提升无线充电系统效率和稳定性
随着人们对于消费产品便携、美观的更高要求,无线充电技术在手机等产品上的使用已相当广泛。无线充电摆脱了充电线材的束缚,为手机充电只需轻轻一放。早期无线充电的功率较低,充满手机需要数个小时,但随着技术进步和各厂商不断升级无线充电器,目前无线充电器的主流功率已经来到50W及以上。
无线充电器要实现无线电力传输主要有以下几种方式:电磁感应(Inductive)、磁场共振(Resonant)、射频微波(RF)。这一新兴技术的本质在于要让信号发生变化:
接收端在传达信息时,会在接收端LC Tank两侧接入或者接出一组电容;
电容的接入或者接出会引起发射端LC Tank的等效阻抗发生变化;
等效阻抗发生变化就会引起发射端LC Tank里面的电流发生变化,以及电容和电感连接处的电压(线圈电压)发生变化,形成谐振电路。
这其中,电容作为无线充重要的被动元器件,主要用于滤波、谐振等关键功能,需要其具备高耐压、低损耗、高稳定性以及高集成化等特点,综合来看,MLCC与电解电容、薄膜电容相比,成为了优化无线充电效率、提升系统稳定性和减少空间占用率的不二之选。
目前,无线充电技术水平不断提高,主要体现在以下几个方面:
1、高效率:采用最新的电力传输协议和架构,提高了无线充的转换效率
2、高稳定性:通过优化电路设计,使无线充能够不因外界干扰或设备自身的因素而造成充电效率降低或充电中断
3、小型化:采用集成化、模块化的设计,使得无线充可内接到设备内部形成一体化设计,同时保持较高的充电效率
为了满足以上无线充发展的需求,在MLCC的选型上就要满足以下几点:
1、耐高压:改善工艺,提高产品介质层的致密性
2、高稳定性:使用稳定的1类瓷材料
3、小型化:采用更小尺寸或薄型产品
4、低ESR(等效串联电阻):使用具有更低的ESR参数的产品来降低电路中纹波电流对MLCC的影响
而宇阳科技作为一家致力于成为全球优质的MLCC供应商,应对无线充技术发展遇到的难题与瓶颈,宇阳科技正不断推出对应的产品来助力无线充技术的发展。以下展示宇阳科技C1206C0G104J101NPL(1206-C0G-100nF-±5%-100V)的四种高频特性曲线和不同频率下的温升曲线:
在以上四组高频对比曲线可以清楚的看到1206-C0G-100nF-±5%-100V具有良好的Q值(即具有更低的损耗),ESR值和自谐振频率点。而这些优良的特性在无线充电系统中,使得MLCC在实现电源与负载的阻抗匹配,形成谐振电路的同时,提高了电源转换的效率和使用寿命。
再从四组温升对比曲线图中可以看出随着频率的提高,在100KHz到1MHz的变化过程中,1206-C0G-100nF-±5%-100V的自发热在规范标准内(均在20℃温度裕量内),充分说明了该产品有极其宽泛的工作频率。而纹波电流的大小直接关系到无线充产品输出端口的质量及其对负载设备的影响,因此纹波电流也是各位工程师们必须考虑的一项参数。
综上所述,C1206C0G104J101NPL(1206-C0G-100nF-±5%-100V)在无线充电应用中展现出了卓越的性能优势,是提升无线充电系统效率、稳定性的理想选择。
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本文由玉鹤甘茗转载自宇阳科技公众号,原文标题为:宇阳科技 | 谐振MLCC在大功率无线充电器中的应用,本站所有转载文章系出于传递更多信息之目的,且明确注明来源,不希望被转载的媒体或个人可与我们联系,我们将立即进行删除处理。
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目录- A系列车载片式多层陶瓷电容器 E系列车载动力安全类片式多层陶瓷电容器 Q系列车载低损耗片式多层陶瓷电容器
型号- 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电子商城
品牌:KYOCERA
品类:Multilayer Ceramic Capacitors
价格:¥0.2858
现货: 7,500
现货市场
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