5SHY3545L0016 3BHB020720R0002 ABB IGCT可控硅模块

Description

IGCT的门极电路里，包含了大量的IC和电阻电容，尤其是有大量的电解电容，为了提供大的关断电流而设计，使其有一定的寿命限制；而且，这种电容是不可更换的，必须连着整个器件一起更换，造成维护成本增大。如果器件出现故障，对于IGBT构成的系统，一般更换驱动电路或IGBT即可，价格在1500元以内，而且常规电压的IGBT及其驱动电路在内地市场代理商林立，一般都有现货；而对于IGCT构成的系统，必须更换整个IGCT，更换一次一般在20000元以上，其国内代理商只有少数几家，由于占用资金大，一般没有现货，所以一旦出现故障，维修周期长、费用高，而且由于器件复杂，对维修的技术人员要求很高，过了保修期以后往往受制于人。在电路设计上，IGBT只需要很小而比较简单的缓冲电路，有时甚至可以省略缓冲电路；IGCT除了要有电压缓冲电路外，还必须有电流缓冲电路，以抑制关断时的二次击穿，比IGBT复杂。目前的IGBT和IGCT开、关损耗都差不多，构成的变频器，效率也差别不大。要论优势，主要是IGCT的耐压目前比IGBT的耐压高，应用于高压变频器的话使得器件减少。但是目前的风电变流器都是690V的，IGBT的耐压也就足够了。IGCT以前的优点是电流大，方便串联应用，4500V/4000A很平常，现在被IGBT慢慢追上，IGBT有4500V/1200A的，可以并联，不方便串联，IGCT缺点是开关频率不能太高，波形没有IGBT好，损耗大，谐波大，对算法要求更高，价格贵。IGCT在超大电流场合应用较多，例如轧钢环境，3300V，上万kw功率，三电平IGCT变频器（西门子SM150）发挥出最好的控制性能。

5SHY3545L0016 3BHB020720R0002 3BHE039203R0101 GVC736CE101

The gate circuit of IGCT contains a large number of ICs and resistive capacitors, especially a large number of electrolytic capacitors. It is designed to provide a large turning off current and has a certain lifespan limit; Moreover, this type of capacitor is non replaceable and must be replaced together with the entire device, resulting in increased maintenance costs. If the device malfunctions, for the system composed of IGBT, it is generally sufficient to replace the driver circuit or IGBT, with a price of less than 1500 yuan. In addition, there are many agents in the mainland market for conventional voltage IGBT and its driver circuit, and they are generally available in stock; For the system composed of IGCT, the entire IGCT must be replaced, usually at a cost of over 20000 yuan per replacement. There are only a few domestic agents, and due to the high cost, there are generally no stock available. Therefore, once a malfunction occurs, the maintenance cycle is long and the cost is high. Moreover, due to the complexity of the components, the requirements for maintenance technicians are high, and after the warranty period, they are often constrained by others. In circuit design, IGBT only requires a small and relatively simple buffer circuit, and sometimes even omits the buffer circuit; In addition to having a voltage buffer circuit, IGCT must also have a current buffer circuit to suppress secondary breakdown during shutdown, which is more complex than IGBT. At present, the switching losses of IGBT and IGCT are similar, and the efficiency of the frequency converter is not significantly different. In terms of advantages, the main reason is that the withstand voltage of IGCT is currently higher than that of IGBT, which reduces the number of devices when applied to high-voltage frequency converters. However, the current wind power converters are all 690V, and the withstand voltage of IGBTs is sufficient. The previous advantage of IGCT was its high current, which was convenient for series application. 4500V/4000A was very common, but now it is gradually catching up with IGBT. IGBT has 4500V/1200A, which can be connected in parallel, making it inconvenient for series connection. The disadvantage of IGCT is that the switching frequency cannot be too high, the waveform is not as good as IGBT, the loss is large, the harmonics are large, and the calculation requirements are higher, and the price is expensive. IGCT is widely used in extremely high current situations, such as steel rolling environments, with a power of 3300V and tens of thousands of kW. The three-level IGCT frequency converter (Siemens SM150) exhibits the best control performance.

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