GK71 B+ turn on delay

kk84 · 21st January 2009, 03:14 PM

Hi folks.

Building power supply I`ve reached one difficulty. How to solve turn on delay circuit - switching element. Biggest problem is unavaliability of high voltage relays, most of scr`s or triacs reaches 600-800V and thats it. In short time ill try to put some schematics so We can think about solution. Maybe series connection of two scr`s or triacs ? ..

atarashi · 21st January 2009, 03:20 PM

Well,

what kind of voltage level do we talk here?

brgds
Michael

richwalters · 21st January 2009, 05:21 PM

Short of ideas ? try this. Obviously modify for higher voltages and reset. loads of possibilities. Don't use coolMos. They have poorly designed gates and will oscillate.

richy

atarashi · 22nd January 2009, 07:02 AM

looks ok, there are lots of possibilities, but kk84 seems in the need of something that is capable of switching much higher voltages, as the normal FET, Triac or Thyristor ratings seem to low for him?

My take a very high Voltages: use a Filament-transformer and a High-Voltage Transformer and do a staggered turn on, so you only need to switch the primary side...

Michael

kk84 · 2nd February 2009, 07:31 PM

Hey.

Thanks for reply, sorry for My absence

. Of course issue was high voltage switching element in B+ power supply, switchung voltage of 1100V. Already found an thyrystor capable of handling such high voltage

, here`s datasheet :

http://pdf1.alldatasheet.com/datashe...S/TYN1225.html

SCR driven in classic aplication with Ug = 12V, Rg = 33R. In short time i`ll post schematics of working power supply.

Have a nice evening all.

21st January 2009, 03:14 PM	#1
kk84 diyAudio Member Join Date: Aug 2008	GK71 B+ turn on delay Hi folks. Building power supply I`ve reached one difficulty. How to solve turn on delay circuit - switching element. Biggest problem is unavaliability of high voltage relays, most of scr`s or triacs reaches 600-800V and thats it. In short time ill try to put some schematics so We can think about solution. Maybe series connection of two scr`s or triacs ? ..

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21st January 2009, 03:20 PM	#2
atarashi diyAudio Member Join Date: Jun 2005 Location: Vienna	Well, what kind of voltage level do we talk here? brgds Michael

22nd January 2009, 07:02 AM	#4
atarashi diyAudio Member Join Date: Jun 2005 Location: Vienna	looks ok, there are lots of possibilities, but kk84 seems in the need of something that is capable of switching much higher voltages, as the normal FET, Triac or Thyristor ratings seem to low for him? My take a very high Voltages: use a Filament-transformer and a High-Voltage Transformer and do a staggered turn on, so you only need to switch the primary side... Michael

2nd February 2009, 07:31 PM	#5
kk84 diyAudio Member Join Date: Aug 2008	Hey. Thanks for reply, sorry for My absence . Of course issue was high voltage switching element in B+ power supply, switchung voltage of 1100V. Already found an thyrystor capable of handling such high voltage , here`s datasheet : http://pdf1.alldatasheet.com/datashe...S/TYN1225.html SCR driven in classic aplication with Ug = 12V, Rg = 33R. In short time i`ll post schematics of working power supply. Have a nice evening all.

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