how to drive capacitance with tyristor or triac

M

mesuthh

New Member

• Feb 6, 2011

• #1

Hello People;
I am trying drive 25uf capacitance with a optocoupler and triac. I have tried so many triacs and huge heatshinks, but always triacs goes fire because the high temperature on triac.
is there any advice
thanks from now on
regards

 

tcmtech

Banned

Most Helpful Member

• Feb 6, 2011

• #2

Why are you trying to drive a capacitive load? What purpose?

 

B

BrownOut

Banned

• Feb 7, 2011

• #3

You probably don't have any resistance to limit the current into your capacitor. Always limit capacitor current with a suitable resistor.

 

Mr RB

Well-Known Member

• Feb 8, 2011

• #4

Probably oine of those silly "rail guns" where they dump a lot of energy from a high voltage cap through the triac into what is basically a dead short load, that may or may not make something move.

I think "triacs goes fire" is a common symptom.

 

J

Jaguarjoe

Member

• Feb 9, 2011

• #5

Must be some awfully high voltage to get remarkable energy from 25uf.
The Navy's railgun is 32MJ, they want to double that to 64 and eliminate cruise missles.