触发器(trigger)是个特殊的`存储过程，它的执行不是由程序调用，也不是手工启动，而是由个事件来触发，比如当对一个表进行操作( ，， update)时就会激活它执行。触发器经常用于加强数据的完整性约束和业务规则等。 触发器可以从 DBA_TRIGGERS ，USER_TRIGGERS 数据字典中查到。
用途
Active Trigger Units for Power Thyristor equipment
优势
Reduced Costs
- Requires no gate drive power
- Triggers any thyristor*
- Reduced printed circuit board cost due to its small footprint and the elimination of the gate drive power
supply
- Fully tested product
- Simplifies logistics as it triggers any size thyristor*
Compact
- Reduces the control card size because of its small footprint and the absence of a gate drive power supply
Simple Design
- Replaces many traditional components
High Reliability
- Superior electrical isolation
- Performs well in very harsh industrial environments
High Performance
- Handles any inductive or high di/dt load due to powerful gate pulse
Trends in the marketplace
- Supports the trend away from magnetics using the latest technology
分类
AT410
-Controlled Recitifiers
-AC Controllers
-DC Motor Control
AT411
-For low cost AC Controllers
AT412
-Zero-crossing switching applications
-Heating
-Welding
-Power factor correction
-Solid State relays from 2A -2kA
AT414
-For triggering a single Thyristor where the control circuitry is far removed from the Thyristors
-e.g. in electrostatic precipators and electrowinning rectifiers
AT416
AT416
