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SCMT474K122H8N29-F Datasheet(PDF) 1 Page - Cornell Dubilier Electronics |
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SCMT474K122H8N29-F Datasheet(HTML) 1 Page - Cornell Dubilier Electronics |
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1 / 3 page  CDE Cornell Dubilier •1605 E. Rodney French Blvd•New Bedford, MA 02744•Phone: (508)996-8561•Fax: (508)996-3830•www.cde.com Type SCMT Single/Dual IGBT Snubber Capacitor Modules Applications Use style SCMT as a discharge restrictive de-coupling to protect dual IGBT modules from overvoltage, Figure 1. Style SCMT may also be used as an “N” or “P” type snubber component for a clamp snubber where single IGBT modules are used, Figure 2. Highlights • Mount directly to the IGBT module • 1 or 2 wire taps for connecting external resistor • Low inductance • Flame resistant case and epoxy, meets UL 94VO • Low Loss • Other terminal pitches and capacitance values available. • Hyperfast diodes integrated into • RoHS Compliant package Discharge Restrictive De-coupling The circuit in Figure 1 operates on the same principles as the de-coupling capacitor, but only during turn-off switching. As the IGBT turns off, energy trapped in the loop inductance is transferred to the capacitor. The diode blocks oscillations from occurring and excess charge on the capacitor is discharged through the external resistor. RCD Clamp The function of this snubber is similar to a clamp, Figure 2. At turn-off, the snubber diode is forward biased and the snubber is activated. The energy trapped in the stray inductance is absorbed by the snubber capacitor. During turn-on the snubber caps that were fully charged to bus voltage have a discharge path through the forward biased free-wheel diode, the IGBT, and the snubber resistors. This reduces the reverse recovery voltage transient. SCMT型 单个或双个IGBT突波吸收密封盒装电容器 使用SCMT型目的就像是放电限制分离耦合，是保护双IGBT模块。 用途 如图1，SCMT型也是有“N”型或“P”型突波吸收电容，各对一个IGBT.。 特点 可直接安装在IGBT上 低电感 低损耗 内装快恢管 一条或者两条引线可连接到电阻上 UL94VO阻燃环氧树脂封装 各种间距的电容器可供选择 使用环保材料 放电限制分离偶合 在图1中的线路中操作上与放电限制分离耦合一样， 但只有在关閉转换时， 当IGBT关的时候，感性线圈中的能量被转移到电容上。 从充电到充电过于饱和，通过电容内部电阻，二极管阻止了振荡。 这种突波吸收功能就像一个夹子，如图2，在关断时， 于是就产生了突波吸收的作用。感性线圈中产生的能量 被突波吸收电容吸收了. 当打開时，突波吸收电容 通过母线电压充至饱和，放电回路二极管的正向偏置， IGBT，突波吸收电容电阻。这样会减少反向瞬间电压. RCD吸收回路 |
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