雙燈液晶顯示器高壓板(小口) 本DC-AC轉(zhuǎn)換器用于2燈管LCD背光源上。具有模擬控制功能，較寬的亮度調(diào)節(jié)范圍。在亮度控制范圍內(nèi)高效率低損耗。具有燈電流平衡控制，開(kāi)路，短路自動(dòng)保護(hù)功能。也可根據(jù)客戶要求設(shè)計(jì)特定產(chǎn)品。2 特點(diǎn)本DC-AC轉(zhuǎn)換器是針對(duì)CCFLL、LCD背光源而設(shè)計(jì)的。3 注意1．燈線電流要用高頻電流測(cè)量。2．本高壓板上有一個(gè)3A的保險(xiǎn)絲。3．背光源電壓輸出波形為正弦形。4．本背光源有短路自動(dòng)保護(hù)功能。5．本背光源有開(kāi)關(guān) （ON/OFF）控制輸入端。4 印制電路板尺寸 ：120 30 1.6mm詳見(jiàn)附圖,圖中給出了詳細(xì)的外形尺寸、定位尺寸、空間占用尺寸。5．電性能特性 序號(hào) 項(xiàng)目 符號(hào) 條件 最小 中等 最大 單位1 輸入電壓 V in10.8 12.0 13.2 V2 輸入電流 I in V in=12v，vadj=0v (2 lamp) 0.75 1 1.2 A3 輸入功率 P in V in=12v，vadj=0v (2 lamp)12W4 背光源開(kāi)/關(guān)控制 V on 開(kāi) 2.45.0 VV off 關(guān) 00.7 V5 亮度調(diào)節(jié) V adj 0V(Max) 5V(Min) 05 V6 輸出電壓 V out Vin=12v,Iout=7.7mA(1 lamp)650V7 每端子輸出電流 I out(Min) Vin=12v,Vadj=5.0v(1 lamp)Ta=25℃ 2.2 2.7 3.2 mA rmsI out(Max) Vin=12v,Vadj=0v(1 lamp)Ta=25℃ 7.2 7.7 8.2 mA rms8 輸出頻率 Freq 開(kāi) 40 50 70 KHz9 開(kāi)燈電壓 V open No load V in=12v,Ta=0℃ 1100 1300 1700 V rms10 啟動(dòng)時(shí)間 TSCP No load V in=12v,Vadj=0℃0.8 1.2 s11 效率 V in=12v, Load=80K 90  電流平衡度 0.2mA rms13 燈開(kāi)路保護(hù)Finish Short lamp14 燈短路保護(hù)Finish Short lamp* 以上參數(shù)可隨使用不同的屏有所變化6 引腳下面將說(shuō)明本背光源的輸入和輸出連接。6.1 DC直流輸入直流電源控制用一個(gè)5 2.0有CN1的連接器連接到本PCB板上.I引腳編號(hào) 符號(hào) 說(shuō)明 1 Vin 12VDC 2 GND GND 3 Vbr Vbr 4 No No 5 Von/Off Von/Off CONTRL 6.2 AC交流輸出燈絲的輸出是通過(guò)CN2-CN3來(lái)連接的.7 工作和儲(chǔ)存溫度和溫度工作溫度范圍:-5 50℃工作濕度范圍：10% 95%RH本背光源應(yīng)該在上面范圍內(nèi)工作，在下列條件下可以儲(chǔ)存5萬(wàn)小時(shí)。工作溫度：-20 70℃工作濕度：10% 95%RH*留言內(nèi)容：*驗(yàn)證碼： 賣(mài)家聯(lián)系方式公司名稱：深圳市增輝電子科技有限公司 買(mǎi)賣(mài)通會(huì)員 聯(lián)系人： 張輝輝 先生 (市場(chǎng)部經(jīng)理) 發(fā)發(fā)在線地址：廣東省、深圳市、寶安區(qū)、觀瀾鎮(zhèn)、樟坑徑 郵編：518110 電話：86-0755-27976511 /15818625200 手機(jī)：15818625200 傳真：86-0755-27976511 網(wǎng)址： http://zenghui8888.b2b.hc360.com QQ：597941311英文原文：Inverter into ac, dc will lower if dc voltage transformer, through the communication, namely receive standard pressor ac voltage and frequency. For large capacity of inverter, due to the dc bus voltage is higher, ac output generally do not need to boost transformer can achieve 220V, in medium and small volume of inverter, due to the low voltage dc 12V, such as, must design, 24V pressor circuit.In general, small volume inverter mosfet inverter circuit, there the whole bridge with high frequency inverter circuits pressor push-pull inverter circuits, and will boost the circuit transformer neutral plug up in power, two power tube is alternant, output power, because get ac power transistor DeBian altogether, drive and control circuit is simple, because of the transformer has certain leakage, can limit the short-circuit current, thus improving the reliability of the circuit. Its defect is driven low utilization, transformer perceptual load ability is poor.The bridge has push-pull inverter circuit to overcome the shortcoming, power transistor circuits of the output pulse width adjustment, the output voltage of the RMS is changed. Because of this circuit has free-wheeling loop, even to the perceptual load, the output voltage waveform nor distortion. This circuit faults is under the arm, bridge, no power transistor must therefore be adopted by isolating circuit or special driving power. In addition, in order to prevent, bridge, and the common arms occurs before the final design must be shut, namely current must set time, the dead zone circuit structure is relatively complicated.Photovoltaic (pv) grid inverter circuit control circuit:These kinds of inverter circuit are needed to control circuit, general square wave and are weak wave two control mode, the output pulse inverter circuit is simple, low cost, low efficiency, harmonic components. Sine wave output is the development trend of the inverter, along with the development of microelectronics technology, PWM function of micro processor is also available, so the sinusoidal output inverter technology has matured.1 the output pulse current inverter using PWM integrated circuit, such as SG3525 TL494, etc. Practice shows that the SG3525 integrated circuits, and adopts power mosfet as switch power components, can achieve higher performance price of inverter, because SG3525 has direct driving power mosfet ability and internal standards and operational amplifiers and the voltage protection function, thus its outer circuit is simple.2 the sinusoidal output inverter control circuits, sine wave output inverter, the control circuit can be used as INTEL microprocessor control, the company produces 80C196MC, MOTOROLA MP16 production and CROCHIP company production of MI - PIC16C73 etc, these microcontroller is more road, and PWM generator set, the bridge between the arms of the dead zone, INTEL company adopted 80C196MC realization of the output circuit, sine wave 80C196MC complete sine signals, and the test voltage output voltage, realize communication.)譯文：逆變器將直流電轉(zhuǎn)化為交流電，若直流電壓較低，則通過(guò)交流變壓器升壓，即得到標(biāo)準(zhǔn)交流電壓和頻率。對(duì)大容量的逆變器，由于直流母線電壓較高，交流輸出一般不需要變壓器升壓即能達(dá)到２２０Ｖ，在中、小容量的逆變器中，由于直流電壓較低，如１２Ｖ、２４Ｖ，就必須設(shè)計(jì)升壓電路?！　≈小⑿∪萘磕孀兤饕话阌型仆炷孀冸娐?、全橋逆變電路和高頻升壓逆變電路三種，推挽電路，將升壓變壓器的中性插頭接于正電源，兩只功率管交替工作，輸出得到交流電力，由于功率晶體管共地邊接，驅(qū)動(dòng)及控制電路簡(jiǎn)單，另外由于變壓器具有一定的漏感，可限制短路電流，因而提高了電路的可靠性。其缺點(diǎn)是變壓器利用率低，帶動(dòng)感性負(fù)載的能力較差?！　∪珮蚰孀冸娐房朔送仆祀娐返娜秉c(diǎn)，功率晶體管調(diào)節(jié)輸出脈沖寬度，輸出交流電壓的有效值即隨之改變。由于該電路具有續(xù)流回路，即使對(duì)感性負(fù)載，輸出電壓波形也不會(huì)畸變。該電路的缺點(diǎn)是上、下橋臂的功率晶體管不共地，因此必須采用專門(mén)驅(qū)動(dòng)電路或采用隔離電源。另外，為防止上、下橋臂發(fā)生共同導(dǎo)通，必須設(shè)計(jì)先關(guān)斷后導(dǎo)通電路，即必須設(shè)置死區(qū)時(shí)間，其電路結(jié)構(gòu)較復(fù)雜?！　」夥⒕W(wǎng)逆變器逆變電路的控制電路:　　上述幾種逆變器的主電路均需要有控制電路來(lái)實(shí)現(xiàn)，一般有方波和正弱波兩種控制方式，方波輸出的逆變電源電路簡(jiǎn)單，成本低，但效率低，諧波成份大。正弦波輸出是逆變器的發(fā)展趨勢(shì)，隨著微電子技術(shù)的發(fā)展，有ＰＷＭ功能的微處理器也已問(wèn)世，因此正弦波輸出的逆變技術(shù)已經(jīng)成熟。　　1.方波輸出的逆變器目前多采用脈寬調(diào)制集成電路，如ＳＧ３５２５，ＴＬ４９４等。實(shí)踐證明，采用ＳＧ３５２５集成電路，并采用功率場(chǎng)效應(yīng)管作為開(kāi)關(guān)功率元件，能實(shí)現(xiàn)性能價(jià)格比較高的逆變器，由于ＳＧ３５２５具有直接驅(qū)動(dòng)功率場(chǎng)效應(yīng)管的能力并具有內(nèi)部基準(zhǔn)源和運(yùn)算放大器和欠壓保護(hù)功能，因此其外圍電路很簡(jiǎn)單。　　2.正弦波輸出的逆變器控制集成電路，正弦波輸出的逆變器，其控制電路可采用微處理器控制，如ＩＮＴＥＬ公司生產(chǎn)的８０Ｃ１９６ＭＣ、摩托羅拉公司生產(chǎn)的ＭＰ１６以及ＭＩ－ＣＲＯＣＨＩＰ公司生產(chǎn)的ＰＩＣ１６Ｃ７３等，這些單片機(jī)均具有多路ＰＷＭ發(fā)生器，并可設(shè)定上、上橋臂之間的死區(qū)時(shí)間，采用ＩＮＴＥＬ公司８０Ｃ１９６ＭＣ實(shí)現(xiàn)正弦波輸出的電路，８０Ｃ１９６ＭＣ完成正弦波信號(hào)的發(fā)生，并檢測(cè)交流輸出電壓，實(shí)現(xiàn)穩(wěn)壓。