功率计算

IGBT是电压型元件，可以查查规格书，看看那颗IGBT的栅极驱动电流需要多少，再计算一下就可以了。DC-DC模块要考虑转换效率。

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可以这样估算：

驱动功率=栅极电荷*工作频率*驱动电压

栅极电荷可以从参数表上得到，假设是500nq，

P=500NQ*40KHZ*12V=240mW

4个管子约1W，考虑到密勒电容的影响，实际可取5倍的驱动功率5W。另外还要考虑峰值电流的要求，驱动电路的效率；5W的功率偏小了！