考慮LED照明系統(tǒng)陶瓷蓋

　　設(shè)計(jì)一個(gè)LED照明系統(tǒng)變得更復(fù)雜的任務(wù)，設(shè)計(jì)包括電子LED調(diào)光、顏色、無(wú)線控制，和系統(tǒng)的“智能”，而工程師通常更加關(guān)注自身的功率器件的選擇、驅(qū)動(dòng)和熱管理電路，他們不應(yīng)該失去需要合適的工作電容器的選擇視線。

　　盡管其較高的溫度穩(wěn)定性和較小的尺寸相比，這種類(lèi)型的電影和鋁電解電容，通常設(shè)計(jì)師通過(guò)對(duì)LED照明的陶瓷電容器的使用，很大程度上是因?yàn)樗麄兊碾娫肼暎@誠(chéng)然已經(jīng)引起人們的關(guān)注。

　　這種監(jiān)督的另一個(gè)原因是確信電容器行業(yè)是一個(gè)成熟的市場(chǎng)，供應(yīng)商之間唯一的開(kāi)發(fā)工作是將更高的電容/電壓（CV）壓縮到更小的封裝中。這是一個(gè)錯(cuò)誤的信念。事實(shí)上，陶瓷電容器制造商繼續(xù)研究新材料和電極設(shè)計(jì)，以改善在諸如噪聲、紋波電流和直流偏置等領(lǐng)域的性能，尤其是針對(duì)LED照明等目標(biāo)市場(chǎng)。

　　This article will look at advances in ceramic capacitor technologies that provide reduced noise and DC smoothing in LED lighting circuits. Examples provided will include Murata‘s GR3 and RDE series and AVX’s QM series.

　　Ceramic capacitor makers agree that noise is one of the biggest issues for LED lighting designs， particularly as LED dimming becomes more popular. Ceramic capacitors operating with a pulse width modulation （PWM） dimmer circuit can cause acoustic noise and light flickering due to piezoelectric effects within the ceramic material. Another potential obstacle is the capacitive DC bias of the ceramic capacitors， which results in a lower capacitance value.