IGBT是電壓型元件，可以查查規(guī)格書，看看那顆IGBT的柵極驅(qū)動(dòng)電流需要多少，再計(jì)算一下就可以了。DC-DC模塊要考慮轉(zhuǎn)換效率。

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可以這樣估算：

驅(qū)動(dòng)功率=柵極電荷*工作頻率*驅(qū)動(dòng)電壓

柵極電荷可以從參數(shù)表上得到，假設(shè)是500nq，

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

4個(gè)管子約1W，考慮到密勒電容的影響，實(shí)際可取5倍的驅(qū)動(dòng)功率5W。另外還要考慮峰值電流的要求，驅(qū)動(dòng)電路的效率；5W的功率偏小了！