BGR-022365模塊,ADVANTEST使用速度
降壓電路經(jīng)LED接入零線和火線，由于LED內(nèi)部等效一個(gè)電容并聯(lián)一個(gè)電阻負(fù)載，相當(dāng)于一個(gè)電阻串聯(lián)在母線上，降壓電路正常工作給后端控制系統(tǒng)供電。在關(guān)態(tài)時(shí)，需要重點(diǎn)關(guān)注LED是否存在“鬼火”現(xiàn)象（LED微亮）。
“鬼火”現(xiàn)象出現(xiàn)的原因?yàn)椋河捎贚ED與降壓電路串聯(lián)在零火線之間，當(dāng)降壓電路需要的輸入電流過(guò)大，則流進(jìn)LED的電流同樣增大，就會(huì)導(dǎo)致LED短暫工作，出現(xiàn)微亮現(xiàn)象。
BGR-022365模塊,ADVANTEST使用速度針對(duì)該問(wèn)題，市面上已有部分廠家能把單火線電源的待機(jī)功耗做到幾個(gè)毫瓦。參考金升陽(yáng)的非隔離LSF01-K5BxxSS系列，該產(chǎn)品結(jié)合外圍電路可滿足全球輸入電壓范圍（85-264VAC），在這輸入工作電壓范圍內(nèi)能維持超低待機(jī)功耗，穩(wěn)定輸出電壓5V、12V等，其待機(jī)功耗約為5.2mW
圖片要點(diǎn)二、關(guān)注單火線電源應(yīng)用電路的功耗問(wèn)題
如何平衡取電能力和不能頻閃，常見(jiàn)的解決方式為有可控硅和繼電器兩種方案。由于可控硅發(fā)熱問(wèn)題，繼電器方案目前在市面上較為主流，以下主要講解繼電器方案的工作原理。其開(kāi)態(tài)的具體工作原理如圖8所示。
1、零火線兩端電壓為正弦波，當(dāng)交流電在正半波時(shí)，由于二極管D2的單向?qū)щ娦院蚆OS管Q1斷開(kāi)，此時(shí)的電流流經(jīng)二極管D1、儲(chǔ)能和控制電路，使儲(chǔ)能和控制電路工作，提供穩(wěn)定輸出電壓給后端控制系統(tǒng)工作，同時(shí)在某個(gè)設(shè)定電壓時(shí)控制MOS管Q1導(dǎo)通。故交流電在正半波時(shí)，只有一小部分能量?jī)?chǔ)存下來(lái)給后端控制系統(tǒng)供電，剩余能量通過(guò)MOS管Q1給LED供電。
2、當(dāng)交流電在負(fù)半波時(shí)，此時(shí)電流通過(guò)LED和二極管D2形成回路，給LED供電。單火線電源應(yīng)用時(shí)應(yīng)注意兩點(diǎn)：
1、LED燈功率不宜過(guò)小，若LED燈功率過(guò)小，會(huì)導(dǎo)致開(kāi)態(tài)取電電路無(wú)法儲(chǔ)存能量給后級(jí)電路供電，能使用的最小LED燈功率需要結(jié)合不同的電路和器件參數(shù)決定；
2、控制電路工作功耗不宜過(guò)大，若控制電路工作功耗過(guò)大，則會(huì)導(dǎo)致關(guān)態(tài)出現(xiàn)“鬼火”現(xiàn)象和開(kāi)態(tài)取電電路異常，由于開(kāi)態(tài)取電電路在參數(shù)確定的情況下，單個(gè)周期儲(chǔ)存的能量有限，無(wú)法提供充足的能量給工作功耗過(guò)大的控制電路；若實(shí)際應(yīng)用需要工作功耗大的控制電路，則需要另外搭建電路解決該問(wèn)題。
單火線的可靠性、體積、應(yīng)用電路成為重點(diǎn)關(guān)注要素
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