怎么前沿上升那么慢？？不怕炸管吗？
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大家看看我DRTC的G极波形如何
大家看看我的G极波形如何都来评价下!!在没接市电的情况下!
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回 3楼(kenking2536) 的帖子
依电路图而定。可以考虑采用目前比较流行的MOS图腾～你把电路图发上来看看啊～不会是DR4吧？
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LZ要不试试悬浮驱动，推动力绝对够。能不能把你的电路图和管子的参数发上来啊？
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LZ最好带载测，桥不加电时的驱动波形和加了电后的差别很大的哦~
一般频率不高的情况下，这个波形还算可以，如果频率高，需要缩短上升下降时间，减小开关损耗~
另外您的驱动部分的电路能否贴下？
一般频率不高的情况下，这个波形还算可以，如果频率高，需要缩短上升下降时间，减小开关损耗~
另外您的驱动部分的电路能否贴下？
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= =楼主是我Q友 他的电路是TL494定频驱动的SSTC
DR Driver怎么可能出这种死区 楼上各大神乃们凋谢了
DR Driver怎么可能出这种死区 楼上各大神乃们凋谢了
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这应该是米勒效应
解释如下：
All of the pictures above show waveforms measured at the gate-source terminals of power MOSFETs with the device switching no current. Only the MOSFET gate was being driven during these tests. There was no voltage applied to the drain terminals of the devices and they were not switching any load current. This condition allows easy comparison between the merits of different gate drive schemes. It also allows changes to be made to the gate-drive circuit without the risk of damaging the MOSFET if the change resulted in an unsuitable drive waveform.
However, it is worth noting that this does not represent the real life situation where the MOSFET is switching considerable power. The gate drive waveforms actually change slightly when the MOSFET is switching real current. This behaviour is due to something called "Miller Capacitance" which exists between the Drain terminal and Gate terminal of a MOSFET. This capacitance has a "negative feedback" effect on the MOSFET when it is undergoing a switching transition, and actually tries to prolong the switching transition, increasing switching losses! The Miller effect is also most noticeable in applications such as ours where the MOSFETs are operated at relatively high drain to source voltages.
大概意思就是空载时无电流。实际是给GD结电容充放电，这也会耦合到G极的驱动信号![txmiller.gif]()
解释如下：
All of the pictures above show waveforms measured at the gate-source terminals of power MOSFETs with the device switching no current. Only the MOSFET gate was being driven during these tests. There was no voltage applied to the drain terminals of the devices and they were not switching any load current. This condition allows easy comparison between the merits of different gate drive schemes. It also allows changes to be made to the gate-drive circuit without the risk of damaging the MOSFET if the change resulted in an unsuitable drive waveform.
However, it is worth noting that this does not represent the real life situation where the MOSFET is switching considerable power. The gate drive waveforms actually change slightly when the MOSFET is switching real current. This behaviour is due to something called "Miller Capacitance" which exists between the Drain terminal and Gate terminal of a MOSFET. This capacitance has a "negative feedback" effect on the MOSFET when it is undergoing a switching transition, and actually tries to prolong the switching transition, increasing switching losses! The Miller effect is also most noticeable in applications such as ours where the MOSFETs are operated at relatively high drain to source voltages.
大概意思就是空载时无电流。实际是给GD结电容充放电，这也会耦合到G极的驱动信号
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这是今天加了市电的情况，初级漂亮的正弦波，就是随着电压高了D极尖峰也大了！！25V供电部怎么多，100V的时候有50V的尖峰，太过分了！！
第一张图市电25V时初级波形
第二张图市电25V时下管G级波形
第三张图市电25V时上管G级波形
第四张图市电100V时上管D级波形
第五张图市电100V
第六张图市电100V时第一级高压次级电压
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![03072012273.jpg]()
![03072012276.jpg]()
![03072012282.jpg]()
![03072012290.jpg]()
![03072012291.jpg]()
第一张图市电25V时初级波形
第二张图市电25V时下管G级波形
第三张图市电25V时上管G级波形
第四张图市电100V时上管D级波形
第五张图市电100V
第六张图市电100V时第一级高压次级电压
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