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