ASY-M1250-08PI编码器

因此一方面需要给驱动信号的质量进行一定的调理；另一方面，可通过硬僻调整死区时间tdead，如使用施密特触发器，更有效的预防同一桥臂上的IGBT被同时导通； 2、电器隔离：功率驱动部分的电路直接连接直流母线，这势必要有强弱电之间接隔离。这也是为了防止驱动部分的强电干扰耦合到弱电控制部分，影响控制板的可靠工作。且当驱动板产生严重故障时，可避免故障扩散到控制板。隔离方式有光耦、光纤、变压器； 3、输出推动：输出推动部分包含了UG、RG等。这些都直接影响IGBT的工作性能。由于米勒电容CCG的存在，IGBT上下桥臂的通断引起电容充放电，提高门极电压，很容易导致IGBT误导通。因此需要设置一个适合的UGoff来让IGBT可靠关断。但UGoff值过高容易产生浪涌电压，影响器件寿命。对于门极驱动电压UGon来说，其大小不可逾越IGBT门极击穿电压(±20V)；其次，一般12V以下为欠压状态，开关损耗大；开启电压越高，开关速度就会越高，但过高的UGon会使UCE变化过快导致IGBT短路时承受过流时间大打折扣。因此需要配合门极电阻RG进行适当调整。本文使用的IGBT为650V/1200A的FS800R07A2E3。通过查看PDF，选择上面佳的UGon=15V，UGoff=8V。选择这一电压值可以安全通断IGBT，减少开关损耗； 4、驱动保护：为了使lGBT时刻SOA区域内，在极端工作环境下时刻保护IGBT及其他器件的安全，对保护功能提出了更高的要求。这里为了更直观的体现每种失效因素所对应的保护功能； 5、信号反馈：这里的信号反馈主要是指与控制板之间的信号交流。将驱动板检测到的如直流母线电压，驱动板、IGBT温度，短路过压报错等信息传送给控制板，作为和停机保护的依据。

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