可控硅介绍
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可控硅介绍Introduction
•可控硅作用是交流高压开关–直接控制交流负载
high AC voltage static switches
to control AC loads directly on the mains.
•可控硅产品分类Different families (design& technology):
–SCRs(单向可控硅或晶闸管Silicon Controlled Rectifier)–TRIACs(双向可控硅standard 4 quadrants or
SNUBBERLESS™and Logic Level, High Temperature, …)–ACST(triac functionality in planar technology)
–ACS(power functional integration, 1st step)
Excellence in Power Processing, Protection and IPAD™
Excellence in Power Processing, Protection and IPAD™
常用交流开关的方案Solutions for AC Switch
•Triacs 是最廉价的静态交流开关！
Triacs: cheapest solution for static AC Switch !
LOAD
TRIAC
继电器
LOAD
Vac
Excellence in Power Processing, Protection and IPAD™
机械开关（继电器）或静态开关（Triacs) Mechanical or static switch?
静态开关的优势BENEFITS OF SOLID STATE SWITCHES :
寿命和可靠性LIFE TIME / RELIABILITY Shock and vibration resistance.无触点反跳No contact bounce 无音频噪声No accoustic noise
设计注意点POINT TO MANAGE :
¾功率损耗Power dissipation
¾控制和功率电路之间非绝缘（通过增加光耦实现绝缘）No insulation between control & power (add an OPTO)
¾没有移动部件No moving part
脉冲触发
Pulse triggering
零电压开ZVS (ZCS for free)
节省能源
Energy saved
没有电器噪声No electric noise
¾驱动电路易于设计
Easy to drive with electronic circuit ¾快速响应
Fast response time
Excellence in Power Processing, Protection and IPAD™
SCR operation
G
K
A
单向可控硅或晶闸管S witch C ontrolled R ectifier
V SCR
I SCR
I G Switching ON if positive gate pulse current
V SCR
I SCR
O F F s t
a t e
O N s t a t e
Switching OFF naturally when I SCR reaches zero
Turn-ON
Excellence in Power Processing, Protection and IPAD™
双向可控硅Triac operation
A1
A2
V T
I T
G
I G
Turn-on
V T
I T
Turn-on
Turn-off
when I T reaches zero
O F F s t
a t e
O N s t a t e
Turn-off
when I T reaches zero
Turn-ON
Excellence in Power Processing, Protection and IPAD™
ON/OFF control and Burst control
VT
Ig
IT
Vmains
Load
Control circuit
Example: resistive load
IT
OFF
ON Control signal
Vmains
t
t
OFF
Ton
Toff Ton
Cycle Duty +=
Ton
Toff
Conduction
Control signal
IT
OFF
ON
ON/OFF control:
-ex: fan / pump / valve control -Relay replacement
Burst Control :
-Power is set according to duty cycle -Mainly used for heating systems