trigger是什麼意思-觸發器介紹
觸發器(trigger)是個特殊的儲存過程，它的執行不是由程式呼叫，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)時就會啟用它執行。觸發器經常用於加強資料的完整性約束和業務規則等。 觸發器可以從 DBA_TRIGGERS ，USER_TRIGGERS 資料字典中查到。
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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