描述

IGBT通斷頻率要高，但dv/dt就是通斷速度要低，有一定矛盾，只有速度足夠快，頻率才能足夠高。加吸收電路或者IGBT采取軟關(guān)斷，吸收電路是把有可能產(chǎn)生的10kv/us吸收，軟關(guān)斷是指降低開(kāi)關(guān)的關(guān)斷速度，人為造成關(guān)斷拖尾，好處是減小dv/dt，壞處是加大了IGBT損耗，所以要細(xì)致調(diào)整關(guān)斷時(shí)間。IGBT驅(qū)動(dòng)電路關(guān)斷IGBT時(shí)在GE處施加負(fù)電壓（開(kāi)通施加正電壓），在微型電容處串微型電阻，這樣GE電壓下降就會(huì)變慢， 從而減小dv/dt。

常見(jiàn)IGBT參數(shù)：6500V/最大750A; 4500V/ 1200A; 3300V/ 1500A; 1700V/3600A; 1200V/ 3600A。700V和2500V很少應(yīng)用。低于600V的很多，這里不做討論。380V以上的，IGBT電壓要在1200V以上。雖然有6600和6000V電機(jī)，但6500V的IGBT并不適合，6500V的價(jià)格高昂，一個(gè)兩萬(wàn)左右，而且兩電平輸出電壓3300V，最大只有750A的管子，輸出的dv/dt太大，三電平輸出電壓4160V，4160在國(guó)內(nèi)應(yīng)用很少。而采用五電平用4500V的管子就能輸出6600V了，所以6500的管也用不上。

The on/off frequency of IGBT should be high, but dv/dt means the on/off speed should be low, which has a certain contradiction. Only when the speed is fast enough can the frequency be high enough. Adding an absorption circuit or IGBT adopts soft shutdown. The absorption circuit absorbs the potential 10kv/us that may be generated. Soft shutdown refers to reducing the closing speed of the switch, causing manual shutdown delay. The advantage is to reduce dv/dt, while the disadvantage is to increase IGBT loss, so the shutdown time needs to be carefully adjusted. When the IGBT driver circuit turns off the IGBT, a negative voltage is applied at the GE (positive voltage is applied when turned on), and a micro resistor is connected at the micro capacitor. This slows down the voltage drop of the GE and reduces dv/dt.
Common IGBT parameters: 6500V/maximum 750A; 4500V/1200A; 3300V/1500A; 1700V/3600A; 1200V/3600A. 700V and 2500V are rarely used. There are many below 600V, which will not be discussed here. Above 380V, the IGBT voltage should be above 1200V. Although there are 6600 and 6000V motors, 6500V IGBT is not suitable. The price of 6500V is high, around 20000 yuan per unit, and the two-level output voltage is 3300V, with a maximum of only 750A tubes. The output dv/dt is too large, and the three-level output voltage is 4160V. 4160 is rarely used in China. And using a five level 4500V transistor can output 6600V, so a 6500V transistor is also not needed.

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Company Introduction:
Chengdu Sunshine Xihe Co., Ltd. specializes in one-stop procurement consulting for imported industrial spare parts, offering original equipment and professional discontinued parts services. We are committed to providing efficient and reliable automation solutions for our customers. Customer support fast responseThe network of partners spans all continentsGlobal partner networkAlways achieve more delivery, be it parts, service or speed



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