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trigger

(觸發器)

鎖定
trigger(觸發器)是個特殊的存儲過程,它的執行不是由程序調用,也不是手工啓動,而是由個事件來觸發,比如當對一個表進行操作( insert,delete, 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業務規則等。 觸發器可以從 DBA_TRIGGERS ,USER_TRIGGERS 數據字典中查到。
中文名
觸發器
外文名
trigger
用    途
加強數據的完整性約束和業務規則
查    詢
DBA_TRIGGERS

目錄

  1. 1 用途
  2. 2 優勢
  3. 3 分類
  1. AT410
  2. AT411
  3. AT412
  1. AT414
  2. AT416

trigger用途

Active Trigger Units Active Trigger Units
Active Trigger Units for Power Thyristor equipment

trigger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
- 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

trigger分類

triggerAT410

-Controlled Recitifiers
-AC Controllers
-DC Motor Control

triggerAT411

-For low cost AC Controllers

triggerAT412

-Zero-crossing switching applications
-Heating
-Welding
-Power factor correction
-Solid State relays from 2A -2kA

triggerAT414

-For triggering a single Thyristor where the control circuitry is far removed from the Thyristors
-e.g. in electrostatic precipators and electrowinning rectifiers

triggerAT416

AT416