门户-光伏|太阳能|PV|技术|质量|认证|标准
一些标准草案(例如国际电工委员会 61730-2,61215)描述的旁路二极管测试是在75度下短路一个小时,在这个测试中,二极管结点温度应当低于可接受的最大值。结点温度的计算如下: Tj = TL/C + RthL/C * Vf * ISC Tj = junction temperature of the diode, maximum admissible value see datasheet 结点的温度,最大值参考Diotec规格书 TL/C = temperature of contact leads (L) resp. cooling fin of case (C) 连接引线的温度,或者散热片温度 RthL/C = thermal resistance junction – contact lead (L) resp. cooling fin of case (C) 连接引线或者散热片的热阻 Vf = forward voltage drop across diode 正向压降 Isc = module short circuit current 模组短路电流 根据这个测试,Diotec 的太阳能二极管具有以下几个优点: 采用低正向电压的二极管和肖特基二极管,通过降低正向压降从二极管内部减少能耗。 高结点温度说明(Diotec产品Tj可达200°C!)。最大可承受温度一般基于最大重复反向电压的80%,如果实际反向电压比这个值低的多,作为太阳能模组的应用,Diotec 产品的可承受Tj是非常高的。具体请参考Diotec datasheets. 在比较高的电流下,结点温度可以通过适当的降温措施来降低。例如TO-220和D2PAK的封装非常适合这种情形:具有低的结点热阻。 在和组件客户交流的时候,有时候也觉得很困惑,似乎各家都有自己的标准。如果根据IEC6125标准的话,Diotec(德欧泰克)产品优势还是很明显的。自主核心技术,从芯片到封装,全部独立开发完成。在国外极高的知名度和声誉,有助于组件厂家的市场开拓和客户认同。 To comply with the test, solar diodes by Diotec are offering several advantages: Vf Reduced power losses inside the diode by reduced forward voltage drop Vf. Possible with ,Low Vf“-bipolar diodes as well as Schottky diodes. Tj Specification of higher admissible junction temperature Tj (up to 200°C!). The maximum admissible junction temperature is normally based on a DC load of 80% of the maximum reverse repetitive voltage VRRM. If the actual occurring reverse voltage is much below this value, as typical for solar modules, a higher Tj can be specified. See parameters in the Diotec datasheets. RthL/C At higher currents, the junction temperature can be reduced by suitable cooling measures. Ideally suited in this case are package outlines like TO-220 und D2PAK, having low thermal resistance junction to case. |