6181P-15TPXP保质保量，信誉为本 QQ & 电话
上面提到的逆变器拓朴结构不仅在电气隔离方面不同，在可达到的效率、对电压的依赖性等方面也各不相同。因此，没有统一的公式来界定何种逆变器设计是最优秀的设计，用户必须要考虑到具体使用的逆变器特性。
无隔离变压器光伏逆变器的技术关键
目前，只要光伏发电站设计合理，完全可以经济运行。直接并入电网的无变压器型逆变器因为其低成本、高效率而日益受到重视。但是，该技术仍然被认为是&有问题的&。这一点将在下面进行检验和说明。
变压器将电能转化成磁能，再将磁能转化成电能。在输入与输出端之间安装的电气隔离装置导致的能量损失可达到1%，甚至高达2%。因此，无变压器型逆变器的运行效率要比变压器型逆变器高。这种技术还有很多其它的优点，例如材料消耗少、重量轻等。单晶硅的制法通常是先制得多晶硅或无定形硅，然后用直拉法或悬浮区熔法从熔体中生长出棒状单晶硅。熔融的单质硅在凝固时硅原子以金刚石晶格排列成许多晶核，如果这些晶核长成晶面取向相同的晶粒，则这些晶粒平行结合起来便结晶成单晶硅。
单晶硅棒是生产单晶硅片的原材料，随着国内和国际市场对单晶硅片需求量的快速增加，单晶硅棒的市场需求也呈快速增长的趋势。
单晶硅圆片按其直径分为6英寸、8英寸、12英寸(300毫米)及18英寸(450毫米)等。直径越大的圆片，所能刻制的集成电路越多，芯片的成本也就越低。但大尺寸晶片对材料和技术的要求也越高。单晶硅按晶体生长方法的不同，分为直拉法(CZ)、区熔法(FZ)和外延法。直拉法、区熔法生长单晶硅棒材，外延法生长单晶硅薄膜。直拉法生长的单晶硅主要用于半导体集成电路、二极管、外延片衬底、太阳能电池。目前晶体直径可控制在&P3~8英寸。区熔法单晶主要用于高压大功率可控整流器件领域，广泛用于大功率输变电、电力机车、整流、变频、机电一体化、节能灯、电视机等系列产品。目前晶体直径可控制在&P3~6英寸。外延片主要用于集成电路领域。
由于成本和性能的原因，直拉法(CZ)单晶硅材料应用最广。在IC工业中所用的材料主要是CZ抛光片和外延片。存储器电路通常使用CZ抛光片，因成本较低。逻辑电路一般使用价格较高的外延片，因其在IC制造中有更玫氖视眯圆⒕哂邢齃atch-up的能力。
单晶硅也称硅单晶，是电子信息材料中最基础性材料，属半导体材料类。单晶硅已渗透到国民经济和国防科技中各个领域，当今全球超过2000亿美元的电子通信半导体市场中95%以上的半导体器件及99%以上的集成电路用硅。
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硅片直径越大，技术要求越高，越有市场前景，价值也就越高。
日本、美国和德国是主要的硅材料生产国。中国硅材料工业与日本同时起步，但总体而言，生产技术水平仍然相对较低，而且大部分为2.5、3、4、5英寸硅锭和小直径硅片。中国消耗的大部分集成电路及其硅片仍然依赖进口。但我国科技人员正迎头赶上，于1998年成功地制造出了12英寸单晶硅，标志着我国单晶硅生产进入了新的发展时期。
目前，全世界单晶硅的产能为1万吨/年，年消耗量约为6000吨～7000吨。未来几年中，世界单晶硅材料发展将呈现以下发展趋势。
单晶硅产品向300mm过渡，大直径化趋势明显：
随着半导体材料技术的发展，对硅片的规格和质量也提出更高的要求，适合微细加工的大直径硅片在市场中的需求比例将日益加大。目前，硅片主流产品是200mm，逐渐向300mm过渡，研制水平达到400mm～450mm。据统计，200mm硅片的全球用量占60%左右，150mm占20%左右，其余占20%左右。根据最新的《国际半导体技术指南(ITRS)》，300mm硅片之后下一代产品的直径为450450mm硅片是未来22纳米线宽64G集成电路的衬底材料，将直接影响计算机的速度、成本，并决定计算机中央处理单元的集成度。
Gartner发布的对硅片需求的5年预测表明，全球300mm硅片将从2000年的1.3%增加到2006年的21.1%。日、美、韩等国家都已经在1999年开始逐步扩大300mm硅片产量。据不完全统计，全球目前已建、在建和计划建的300mm硅器件生产线约有40余条，主要分布在美国和我国台湾等，仅我国台湾就有20多条生产线，其次是日、韩、新及欧洲。
世界半导体设备及材料协会(SEMI)的调查显示，2004年和2005年，在所有的硅片生产设备中，投资在300mm生产线上的比例将分别为55%和62%，投资额也分别达到130.3亿美元和184.1亿美元，发展十分迅猛。而在1996年时，这一比重还仅仅是零
2、硅材料工业发展日趋国际化，集团化，生产高度集中：
研发及建厂成本的日渐增高，加上现有行销与品牌的优势，使得硅材料产业形成&大者恒大&的局面，少数集约化的大型集团公司垄断材料市场。上世纪90年代末，日本、德国和韩国(主要是日、德两国)资本控制的8大硅片公司的销量占世界硅片销量的90%以上。根据SEMI提供的2002年世界硅材料生产商的市场份额显示，Shinetsu、SUMCO、Wacker、MEMC、Komatsu等5家公司占市场总额的比重达到89%，垄断地位已经形成。
3、硅基材料成为硅材料工业发展的重要方向：
随着光电子和通信产业的发展，硅基材料成为硅材料工业发展的重要方向。硅基材料是在常规硅材料上制作的，是常规硅材料的发展和延续，其器件工艺与硅工艺相容。主要的硅基材料包括SOI(绝缘体上硅)、GeSi和应力硅。目前SOI技术已开始在世界上被广泛使用，SOI材料约占整个半导体材料市场的30%左右，预计到2010年将占到50%左右的市场。Soitec公司(世界最大的SOI生产商)的2000年～2010年SOI市场预测以及2005年各尺寸SOI硅片比重预测了产业的发展前景。
4、硅片制造技术进一步升级：
目前世界普遍采用先进的切、磨、抛和洁净封装工艺，使制片技术取得明显进展。在日本，&P200mm硅片已有50%采用线切割机进行切片，不但能提高硅片质量，而且可使切割损失减少10%。日本大型半导体厂家已经向300mm硅片转型，并向0.13&m以下的微细化发展。另外，最新尖端技术的导入，SOI等高功能晶片的试制开发也进入批量生产阶段。对此，硅片生产厂家也增加了对300mm硅片的设备投资，针对设计规则的进一步微细化，还开发了高平坦度硅片和无缺陷硅片等，并对设备进行了改进。
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硅是地壳中赋存最高的固态元素，其含量为地壳的四分之一，但在自然界不存在单体硅，多呈氧化物或硅酸盐状态。硅的原子价主要为4价，其次为2价;在常温下它的化学性质稳定，不溶于单一的强酸，易溶于碱;在高温下化学性质活泼，能与许多元素化合。
由于硅的禁带宽度和电子迁移率适中，硅器件的最高工作温度能达250℃，其制作的微波功率器件的工作频率可以达到C波段(5GHZ)。在硅的表面能形成牢固致密的SiO2膜，此膜能充当电容的电介质、扩散的隔离层、器件表面的保护层，随着平面工艺与光刻技术的问世而促进了硅的超大规模集成电路的发展。硅材料资源丰富，又是无毒的单质半导体材料，较易制作大直径无位错低微缺陷单晶。晶体力学性能优越，易于实现产业化，从而导致半导体硅材料成为电子材料中的第一大主体功能材料，并在今后较长时间内仍将成为半导体的主体材料。
多晶硅材料是以工业硅为原料经一系列的物理化学反应提纯后达到一定纯度的电子材料，是硅产品产业链中的一个极为重要的中间产品，是制造硅抛光片、太阳能电池及高纯硅制品的主要原料，是信息产业和新能源产业最基础的原材料。
多晶硅产品分类:
多晶硅按纯度分类可以分为冶金级(工业硅)、太阳能级、电子级。
1、冶金级硅(MG)：是硅的氧化物在电弧炉中被碳还原而成。一般含Si 为90 - 95% 以上，高达 99.8% 以上。
2、太阳级硅 (SG)：纯度介于冶金级硅与电子级硅之间，至今未有明确界定。一般认为含Si在 99.99 %& 99.个9)。
3、电子级硅(EG)：一般要求含Si & 99.9999 %以上，超高纯达到99.9999999%～99.%(9～11个9)。其导电性介于 10-4 & 1010 欧厘米。
AGASTAT 20-200SEC. 120V25-400Hz TIME DELAY RELAY 7012L7ELL
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ITALIANA RELE 250VAC 10A 2-POLE INDUSTRIAL RELAY, C4-2 *NEW*
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PHOENIC ConTACT DUAL POWER OUTLET 5600525
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PARKER 18L54BC PNEUMATIC LUBRICATOR REFUBISHED
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UNITED ELECTRIC CONT. 100-1700 PSI 15AMPS 125/250VAC PRESSURE SWITCH J6-680-9582
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FALK 1060T HUB, 2.125 BORE, 1/2 X 1/4KW COUPLING 0704632 *NEW*
BOSCH FF1 SHP0 52H IN-LINE FLOW ConTROL VALVE, NNB
KETT 3-3/8& OAL RIGHT SIDE SHEAR BLADE KNIFE, 60-22R *NEW SEALED*
DEVILBISS REGULATOR ADJUSTMENT KIT KK-5047 *NEW*
FUJI ELECTRIC * 60 AMP ConTACTOR * SC-2N
AEROQUIP HI-IMPULSE HYDRAULIC WATER GAS HOSE CH781-4
ALEMITE , MIST FITTING, 1/8& NPT, 0.49 CFM, LOT OF 5, NNB
MAGNALOY COUPLING ORK-12000 BUNA-N MODULAR O-RING KIT, NIB
LONG CABLE SET 007.2418 *NEW*
SMC 160PSI/MPA 1/4&NPT PRESSURE GAUGE 4274866 ROHS *NEW*
DUNKERMOTOREN 115W VENETIAN BLIND ACTUATOR MOTOR D 554
FANUC SERIES 15-MODEL B FOR MACHINING CENTER PROGRAMMING MANUAL GFZ-62564E/01
NIBCO 2& NPT PIPE TEE FITTING, PVCI-1 *NEW*
JERGENS 11/16& SLOT WIDTH 5/8&-11 THREAD T-SLOT NUT, 43308 *NEW*
NEER NM/SE C- NM/SEU CABLE CONNECTOR, 1& NPT, NEW IN BAG, SEALED
STOBER Antriebstechnik GEAR REDUCER GEAR HEAD 1577514
SIEB & MEYER 26.44.29 / BETA TECH S10 SINUDYN BRUSHLESS MOTOR DRIVE, REPAIRED
SQUARE D SAFETY SWITCH 60A &600VOLTS
SIEMENS FBSV ADAPTER SHOES MECHANICAL MOUNTING ONLY, NIB
STEEL CITY G4 2-1/2&-4& 10-4 BRonZE GROUND CLAMP
PEPPERL + FUCHS MPB27 / 454372 RETRO-REFLECTIVE PHOTOELECTRIC SENSOR base, NIB
GOODYEAR HAWK PD 565-5M-15 TIMING BELT, NEW
HonEYWELL 106615A PLUG-IN RELAY FOR R4075A, NIB
TREGASKISS .045-1/16& QUICK LOAD LINER 415-116-6 *NEW*
ROSS VALVE BODY SERVICE KIT W744K87 *NEW*
PARKER 1&NPT QUICK COUPLING HYDRAULIC NIPPLE HDH8-63
STI ASSY MINISAFE MIRROR STAND MOUNTING KIT, 42450 *NEW NO BOX*
HUBBELL KELLEMS .850&-1.000DIAMETER RANGE CABLE SUPPORT GRIP
TELEMECANIQUE 3A 210V SAFETY INTERLOCK SWITCH XCK-JH7
FANUC SERIES 15-MODEL B PARAMETER MANUAL GFZ-62560E/01
FANUC A SERIES SERVO MOTOR DEscriptION MANUAL GFZ-65142E/02
TRD &MANUFACTURING/LIN-ACT, 1/4&NPT CYLINDER ROD VCX-1-08
LITHonIA LIGHTING TX 250S 480 HSG BALLAST HOUSING, 480 V, NIB
KRAUS & NAMIER 600VAC 16A 2-POSITION ROTARY SWITCH A14
GOULD SHAWMUT 30A 600V 3 POLE FUSEHOLDER 60313
NUMATICS ACTUATOR 8&OAL CYLINDER I
MILLER 50AMP SWIRL RING FOR PLASMA TORCH 17886 *NEW*
VICKERS 10 PSID 6.2 BAR INDICATOR KIT, P-B
THOMAS & BETTS J/2&-4& CAST BRonZE GROUND CLAMP
CROSBY 5/8& ROPE SIZE FORGED WIRE ROPE CLIP, 1010177 *NEW SEALED*
GOULD / FERRAZ SHAWMUT 3 POLE 600V 30A ULTRASAFE FUSEHOLDER USM3 *LOT OF 2*
ATD 15/32 APPROX 5-5/8& OVERALL LENGTH HIGH SPEED TAPER SHANK DRILL BIT
UTD 29/64 APPROX 3-3/4& OVERALL LENGTH HIGH SPEED TAPER SHANK DRILL BIT
HANSON 7/16&-14 NC HEXAGON MACHINE SCREW DIE 0.996& OUTER DIAMETER, 0.376& WIDTH
PACIFIC BEARING CO 3/8&I.D, 7/8&O.D LINEAR BEARING FL08S *NEW*
PHD SEAL KIT FOR SERIES 40MM GRIPPERS 90256 *NEW, SEALED LOT OF 3*
COOPER CROUSE-HINDS CGB295 FLEXIBLE CORD ConNECTOR KIT, 3/4&, NEW IN BAG&
7/16 APPROX 6-1/8& OVERALL LENGTH HIGH SPEED TAPER SHANK DRILL BIT
ITW 7/16 APPROX 5-5/8& OVERALL LENGTH HIGH SPEED TAPER SHANK DRILL BIT
CLEVELAND CLE-FORGE 3/8 APPROX 6& OAL HIGH SPEED TAPER SHANK DRILL BIT
GTD 15/32 APPROX 5-5/8& OVERALL LENGTH HIGH SPEED TAPER SHANK DRILL BIT
HANSON M9X1.0 (9 MM X 1.0) HEXAGON METRIC DIE, 0.996& OUTER DIAMETER, 0.375& WID
29/64 APPROX 5-1/2& OVERALL LENGTH HIGH SPEED TAPER SHANK DRILL BIT
29/64 APPROX 5-7/8& OVERALL LENGTH HIGH SPEED TAPER SHANK DRILL BIT
STANDARD TOOL 1/4 APPROX 5-1/2& OVERALL LENGTH HS TAPER SHANK DRILL BIT
unio BUTTERFIELD UB 5.6 5-1/4& OVERALL LENGTH HSS TAPER SHANK DRILL BIT
HUBBELL 902, SQUARE SURFACE COVER 1 DUPLEX, 4&, RAISED 1/2&, NEW IN BAG SEALED
SWAGELOK 3/4& TUBE O.D. 3-PORT unio TEE FITTING, S-1210-3 *NEW SEALED*
NORGREN P-GLM400-M6-MKS STEEL MOUNTING KIT, NEW IN BAG, SEALED
RELIANCE ELECTRIC S-1N1A frame 184TC 2/.5 HP AC MOTOR, NEW
BRUBAKER /16-18 NC H5, HAND TAP CI W/ NOX. 2.841& OAL, LOT OF 5, NIB
SQUARE D 1/2&NPT SERIES A LIMIT SWITCH016 *NEW*
WORCESTER 4211R, BALL VALVE, 3/4& NPT, 150 PSI WSP, 600 PSI WOG
ROTOR TOOL N54LRAHHT5X40 ½& DRIVE ANGLE PNEUMATIC NUTRUNNER
W & B 1-13/32 M18 APPROX 10-1/4& OVERALL LENGTH HIGH SPEED TAPER SHANK DRILL BIT
GOULD BOS14352 VACU-BREAK SWITCH BUSWAY PLUG 60 A, 600 VAC, 3 PHASE, 3 POLE, NIB
HUBBELL/BELL OUTDOOR 3-OUTLET, &DEEP SINGLE GANGE BOX 5387-0 *NEW, SEALED*
BRADY WML-211-292-1 BRADYMARKER WIRE MARKING LABELS, LOT OF 70 , NIB
MAC PID-116AAAA, SOLENOID VALVE, 150 PSI, 110/120 VAC, 1/2& NPT, 50/60 HZ, NNB
PHD 1-1/8& BORE, 1-1/4& STROKE, 1/8& NPT, TIE ROD CYLINDER AVRF1 1/8 X 1 1/4-P
BOSCH 24VDC, 2.7W, 10BAR, SOLENOID VALVE 0 820 024 510
INVENSYS 043 1/4& NPT 40 PSI 6&-14& W.C. REGULATOR, NNB
BIMBA, BF-096-D, 1 1/16& BORE, 4& STROKE, FRONT BLOCK, DOUBLE ACTING, NNB
OFFICE DEPOT 502-654, LASER TonER CARTRIDGE, REPLACES HP Q6511X, BLACK, NIB
FERRAZ SHAWMUT 600V 30A SINGLE POLE FUSE HOLDER 30321AB 100161
GE 10A RED PUSH BUTTON P9MPLRSDN12NCDL *NEW*
BALDOR 1-1/2HP, 230/460V, 5.2/2.6A, 60Hz,145TC frame, ELECTRIC MOTOR VM7035T
HUBBELL KELLEMS CABLE SUPPORT GRIP
STANLEY A30LRA2-2 ANGLE PNEUMATIC &NUT RUNNER
LYON 9-DRAWER STORAGE CABINET, 30& X 28& X 66.5&
WILDEN 04- SHAFT, P4, CARBON STEEL, 5-1/2& OAL, 1/4& NPT, NIB SEALED
WELDON 3/4&DIA 60&A&DEG ANGLE R.H. CUT ANGULAR CUTTER SHANK TYPE YA 24-2 *NEW*
ZVL-ZKL 0.6&ID, 2.4&OD BEARING ZKL 6206TB P4 *NEW*
SPRECHER+SCHUH ConTACTOR 50A 690V CA7-37-00
ALLEN-BRADLEY BULLETIN 802A-A14P3-S9 ROLLOVER LIMIT SWITCH, 6 A, 300 VAC, NNB
TECHNICAL CHEMICAL COMPANY REFRIGERANT FILTER S 14737 *NEW*
CAMARC WIRE FEED CABLE-AMP, 62-2641-AMP *NEW*
PARKER C GB FILTER ELEMENT, NIB
GENUINE HELIARC 12.5 FT CABLE COVER 35453 *NEW*
PHOENIX ConTACT &POWER SUPPLY TRIO POWER TRIO-PS/1AC/24DC/2.5
NACHI AC SERVO MOTOR TS
MAPAL-WWS APPROX 12-5/8& OAL BORING TOOL, /2 *NEW*
DAYTON CLOTH FILTER 5X878 *NEW*
ISSC .06-5.0 SEC MOTION DETECTOR 1260-1-P-C
NUMATICS L50L-08 1& PORT HIGH FLOW LUBRICATOR, NIB
SKF 258T9 NON-DRIVEN POSITIonING SYSTEM NNB
L&I HIGH SPEED 2-1/2& FLUTE CHUCK REAMER 533.7490 *NEW*
CST 19/32-419 CENTER ROUND DIE, LOT OF 3
ANSELL SIZE 8.5 NEOPRENE GLOVES 29-865 *NEW BOX OF 48*
BOSTON 7/8&BORE HELICAL GEAR NB824R *NEW*
ANDERSON, 995G2, GRAY HANDLE, LOT OF 24, NIB
HUMPHREY 1/8&NPT, AIR CYLINDER HJDA40X1-R *NEW*
ARM MOTOR POWER CABLE WE-
SIEMENS 60 AMP 600V HEAVY DUTY SAFETY SWITCH UNREADABLE PART NUMBER本产品网址：/b2b/lujun/sell/itemid-.html}