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+15V和-12V产生电路中的 二极管和 mos管的用法

Other Parts Discussed in Thread: UC3845

 TMDSHV1PHINVKIT  逆变板  中的IGBT的驱动板中 ,有个15V 输入,隔离产生+15V和-12V的电路,

二极管D3是什么用法?  还有mos管为什么用Q1,Q2两个并联,是双路增大电流吗?(控制芯片U1是 UC3845)