《電子技術(shù)應(yīng)用》
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采用全數(shù)字控制方式的汽車HID 氙氣燈解決方案

2009-04-02
作者:深圳世強(qiáng)電訊有限公司

??? 過去汽車車燈多采用普通鹵素?zé)襞?,這種車燈的瓦數(shù)和亮度不夠、色溫過低、燈色偏黃,而且壽命較短,故障率偏高。日前,HID(High Intensity DischargeLamp)氙氣燈" title="氙氣燈" target="_blank">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" title="氙氣燈">氙氣燈" 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??? 世強(qiáng)電訊根據(jù)國內(nèi)HID 市場的特點(diǎn)需要推出了基于Silicon Labs MCU 的單芯片氙氣燈全數(shù)字智能安定器解決方案。該方案采用全數(shù)字控制,符合目前數(shù)字化的發(fā)展潮流。單芯片的控制技術(shù)可使出廠調(diào)試的工作量大大減少。此外,采用了多項(xiàng)專利技術(shù)來提高HID 安定器的性能,包括豐富的故障檢測、高性能的環(huán)路響應(yīng)、展頻特性等?!岸@些特性在模擬方案或采用MCU+3843 的方案中都是無法實(shí)現(xiàn)的?!鄙钲谑缽?qiáng)電訊有限公司應(yīng)用工程師經(jīng)理戈洪凱表示。

??? 這款HID 安定器解決方案的特點(diǎn)包括:全數(shù)字控制使保護(hù)功能更加完善;MCU 控制每一個(gè)過程的細(xì)節(jié),能更好滿足燈的特性需求;變頻控制使EMI 降到最低,同時(shí)減少EMI 元件數(shù)量;結(jié)合硬件進(jìn)行算法優(yōu)化,采用多項(xiàng)專利技術(shù)完善對HID 的過程控制和限流保護(hù)處理;全數(shù)字設(shè)計(jì)使整個(gè)方案基本非常好的可擴(kuò)展性,可以快速滿足特殊需求的定制開發(fā);采用平面變壓器等技術(shù),有效降低安定器厚度和體積;支持正驅(qū)動(dòng)和負(fù)啟動(dòng)形式,適應(yīng)各種不同電路方案的安定器;高壓包可采用分體和內(nèi)置輸出,低壓線引出,高壓線短,安裝方便體積明顯減小許多;CPU 可以選用電可擦寫芯片;保密性強(qiáng),有利于知識(shí)產(chǎn)權(quán)保護(hù)。

??? 世強(qiáng)的方案采用高性能的MCU 實(shí)現(xiàn)HID 控制功能,該器件實(shí)現(xiàn)了整套的控制算法,包括DC/DC,DC/AC,保護(hù)功能等。整個(gè)方案由MCU、驅(qū)動(dòng)及功率元件構(gòu)成,結(jié)構(gòu)非常簡單,且所有元件都經(jīng)過優(yōu)化設(shè)計(jì),因而具有良好的性價(jià)比。高集成度使元件的數(shù)量和面積得到減少,大量采用貼裝元件實(shí)現(xiàn)了良好的散熱設(shè)計(jì)和超薄設(shè)計(jì)。良好的供電拓?fù)浣Y(jié)構(gòu)和元件參數(shù)則使方案能夠支持寬工作電壓。


??? 在數(shù)字化控制中,高速M(fèi)CU 是整個(gè)系統(tǒng)的核心,通過MCU 可以控制安定器的每個(gè)細(xì)節(jié)和節(jié)電狀態(tài),實(shí)現(xiàn)燈的老化狀態(tài)報(bào)警等功能。數(shù)字化處理能使算法更復(fù)雜和精確,而模擬處理受限于硬件的數(shù)量和成本,很難實(shí)現(xiàn)復(fù)雜的處理。此外,調(diào)試模擬的控制方法還會(huì)受元件一致性的影響,批量生產(chǎn)和調(diào)試都存在困難。通常安定器在開燈時(shí)會(huì)達(dá)到23,000V 的電壓,啟動(dòng)時(shí)將有電磁干擾(EMI)產(chǎn)生,這會(huì)對車內(nèi)復(fù)雜的電子系統(tǒng)會(huì)造成嚴(yán)重干擾。世強(qiáng)電訊數(shù)字式智能安定器在電路上采取了許多抗干擾措施,例如變頻工作模式、良好的布線等,從而在有效降低系統(tǒng)成本的同時(shí),顯著降低了EMI。

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世強(qiáng)電訊HID 安定器解決方案的結(jié)構(gòu)示意圖。

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??? 氙氣燈管的額定電壓為85±17V。薄型數(shù)字式智能安定器能在燈管電壓AC 40~150V 左右正常工作,可以適應(yīng)最新的無汞氙燈(D4S)。無須做任何調(diào)整就能適應(yīng)國內(nèi)外不同廠家氙氣燈管的特性,保護(hù)氙氣燈泡不受損壞,從而使燈泡壽命延長,同時(shí)也為給提供消費(fèi)者后續(xù)服務(wù)帶來很大方便。而部分安定器只能適應(yīng)特定廠家的氙氣燈管,如果換用另一種類型的氙氣燈管,則輸出功率相差8~9W,很容易造成燈管早期損壞。

??? 不過,戈洪凱也指出,盡管HID 產(chǎn)品的顯色性好、功率大,但它仍然面臨來自其它照明系統(tǒng)的挑戰(zhàn),包括LED、高壓鈉燈等。與LED 相比,安定器的成本仍然偏高,同時(shí)不同廠商的HID 燈特性差異較大,這也使得它的大規(guī)模推廣受到限制。另一方面,目前HID 安定器返修率比較高,貼片方案存在很多的問題,這些都導(dǎo)致HID 的成本居高不下。部分方案中模擬器件的大量使用也使其出廠調(diào)試難度大大增加,同時(shí)難以保證批次一致性。

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