目前，为了防止高dV/dt应用于桥式电路中的IGBT时产生瞬时集电极电流，设计人员一般会设计栅特性是需要负偏置栅驱动的IGBT。然而提供负偏置增加了电路的复杂性，也很难使用高压集成电路（HVIC）栅驱动器，因为这些IC是专为接地操作而设计──与控制电路相同。因此，研发有高dV/dt能力的IGBT以用于“单正向”栅驱动器便最为理想了。这样的器件已经开发出来了。器件与负偏置栅驱动IGBT进行性能表现的比较测试，在高dV/dt条件下得出优越的测试结果。

　　为了理解dV/dt感生开通现象，我们必须考虑跟IGBT结构有关的电容。图1显示了三个主要的IGBT寄生电容。集电极到发射极电容C，集电极到栅极电容C和栅极到发射极电容CGE。

 　　这些电容对桥式变换器设计是非常重要的，大部份的IGBT数据表中都给出这些参数：

　　输出电容，COES＝CCE＋CGC（CGE短路）

　　输入电容，CIES＝CGC＋CGE（CCE短路）

　　反向传输电容，CRES＝CGC

         图2给出了用于多数变换器设计中的典型半桥电路。集电极到栅极电容C和栅极到发射极电容C组成了动态分压器。当高端IGBT（Q2）开通时，低端IGBT（Q1）的发射极上的dV/dt会在其栅极上产生正电压脉冲。对于任何IGBT，脉冲的幅值与栅驱动电路阻抗和dV/dt的实际数值有直接关系。IGBT本身的设计对减小C和C的比例非常重要，它可因此减小dV/dt感生电压幅值。

　　如果dV/dt感生电压峰值超过IGBT的阀值，Q1产生集电极电流并产生很大的损耗，因为此时集电极到发射极的电压很高。

　　为了减小dV/dt感生电流和防止器件开通，可采取以下措施：

　　关断时采用栅极负偏置，可防止电压峰值超过V，但问题是驱动电路会更复杂。

　　减小IGBT的CGC寄生电容和多晶硅电阻Rg’。
　　减小本征JFET的影响

　　图3给出了为反向偏置关断而设计的典型IGBT电容曲线。CRES曲线（及其他曲线）表明一个特性，电容一直保持在较高水平，直到V接近15V，然后才下降到较低值。如果减小或消除这种“高原”(plateau) 特性，C的实际值就可以进一步减小。

　　这种现象是由IGBT内部的本征JFET引起的。如果JFET的影响可以最小化，C和C可随着VCE的提高而很快下降。这可能减小实际的CRES，即减小dV/dt感生开通对IGBT的影响。

图3 需负偏置关断的典型IGBT的寄生电容与V的关系。

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title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" 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title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" 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title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E" title="IRGP30B120KD-E">IRGP30B120KD-E是一个备较小C和经改良JFET的典型IGBT。这是一个1200V，30A NPT IGBT。它是一个Co-Pack器件，与一个反并联超快软恢复二极管共同配置于TO-247封装。

   　设计人员可减小多晶体栅极宽度，降低本征JFET的影响，和使用元胞设计几何图形，从而达到以上的目标。

       对两种1200V NPT IGBT进行比较：一种是其他公司的需负偏置关断的器件，一种是IR公司的NPT单正向栅驱动IRGP30B120KD-E。测试结果表明其他公司的器件在源电阻为56Ω下驱动时，dV/dt感生电流很大。

      比较寄生电容的数据，IR器件的三种电容也有减小：、

  　输入电容，CIES减小25％
　 输出电容，COES减小35％
　 反向传输电容，CRES减小68％

        图5显示出IR器件的减小电容与V的关系，得出的平滑曲线是由于减小了JFET的影响。当V＝0V时，负偏置栅驱动器件的C为1100pF，IRGP30B120KD-E只有350pF，当VCE＝30V时，负偏置栅驱动器件的C为170pF，IRGP30B120KD-E的CRES为78pF。很明显，IRGP30B120KD-E具有非常低的C，因此在相同的dV/dt条件下dV/dt感生电流将非常小。

图5 IRGP30B120KD-E寄生电容与VCE的关系

          图6的电路用来比较测试两种器件的电路性能。两者的dV/dt感生电流波形也在相同的dV/dt值下得出。

　　电压率，dV/dt=3.0V/nsec
　　直流电压，Vbus=600V
　　外部栅到发射极电阻Rg=56Ω
　　环境温度，TA＝125°C  

 

图7 其他公司的IGBT的低端IGBT开关电压和dV/dt感生电流的18A峰值 

图8 IRGP30B120KD-E IGBT的低端IGBT开关电压和dV/dt感生电流的1.9A峰值

         dV/dt感生电流的减小清楚说明单正向栅驱动设计的优胜之处。但在这个测试中，Co-Pack二极管电流的影响并没有完全计算在内。为了只显示出IGBT对整体电流的影响，我们只利用相同的分立式反并联二极管再重复测试，如图9中的Ice(cntrl)。

图9 利用相同的分立式Co-Pack二极管产生的dV/dt感生电流

图10显示出在没有IGBT情况下，负偏置栅驱动器IGBT的I电流。图11为IRGP30B120KD-E单正向栅驱动器的I电流。两种情况下的电流都很低，分别为1A和0.8A。 

         如果从整体IGBT/二极管电流中减去图10和图11的二极管电流，结果是

        I（负偏置栅驱动IGBT）= 18-1 = 17A

　　I（IRGP30B120KD-E）= 1.9-0.8 = 0.8A

　　可见总的减小为17:0.8 = 21:1

　　在相同的测试条件下，当栅电压是在0V或单正向栅驱动情况下，IRGP30B120KD的电路性能显示dV/dt感生开通电流减小比例为21:1。如果IGBT采用这种方式驱动，电流很小，对功耗的影响几乎可以忽略。

图12 栅驱动波形

        采用单正向栅驱动IGBT有下列好处：

　　不需要负偏置
　　驱动器电路成本更低
　　更高的栅抗噪声功能
　　更高的dV/dt耐容
　　与不能提供负偏置驱动的IR单片式栅驱动器兼容

 图13 具有电平转换的栅驱动IC电路

        上述设计对PT和NPT IGBT同样有效。

　　结论：

　　单正向栅驱动IGBT是器件发展的巨大进步。IRGP30B120KD-E的C值很低，在单正向栅驱动条件下，其开关性能非常理想。器件不需要负偏置栅驱动便能可靠关断，即使在集电极的dV/dt为3V/ns。与单片式栅驱动器的兼容性更为桥式变换器和交流电机驱动提供更优越和成本更低的解决方案。所以我们期望这些先进的IGBT能为新的IC设计提供更大的优势。