trigger是什麼意思-觸發器介紹
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觸發器(trigger)是個特殊的`存儲過程,它的執行不是由程序調用,也不是手工啟動,而是由個事件來觸發,比如當對一個表進行操作( ,, update)時就會激活它執行。觸發器經常用於加強數據的完整性約束和業務規則等。 觸發器可以從 DBA_TRIGGERS ,USER_TRIGGERS 數據字典中查到。
用途
Active Trigger Units for Power Thyristor equipment
優勢
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
分類
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
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