i have made a magnetizer for charging loudspeaker ferrites. It is working well at 1500vdc. Currently I am using a mechanical switch to discharge capacitors into the coil for magnetization.
Now i want to implement SSR relays or thyristors but i don't understand its work and if I want to buy ready made ones then there is nothing available above 1200vdc. Also the guy who sells it says it cannot be used in series.
Any guidance can be very helpful. sorry for my English.
Now i want to implement SSR relays or thyristors but i don't understand its work and if I want to buy ready made ones then there is nothing available above 1200vdc. Also the guy who sells it says it cannot be used in series.
Any guidance can be very helpful. sorry for my English.
without details like components used, it's difficult to answer as voltage is not the only constraint. A schematic with values may help
The main application for SSR's is switching line voltages, single or three fase up to 400Vac. The safety marging is set for 1200V to avoid break down. Your application however is way beyond this limits. You may find thyristors capable of handling 1500V and serious peak currents (when discharging the cap), but a study the electronics and parts may result in a working circuit.
the thing is the caps hold the voltages and i dont think mains voltage has to do anything with it. Mains voltage is 230vac single phase converted to 1100vac using a trafo. capacitors bank is charged for 2-3 seconds after that mains voltage gets disconnected and the capacitor are discharged into the air coil which holds the ferrite in it. the discharging sequence is done using a mechanical switch. It creates spark and is very hard to swing.
It is a DIY project done by me and my father. I have failed in math even in my primary school so don't expect anything that is technical.
This whole thing was started with trial and error system.
I saw this thing at a speaker workshop & got to know the work of product but never got any chance to see what circuit that guy used to discharge the capacitor.
I clearly know i am being vague but this the only info i have on me.
Hope anyone could help.
In past I played with laser using high voltage transistor (BU208, 2SD2524...) that may be a solution, but without schematic, it's difficult to evaluate energy to switch.
Hi,
For you consideration attached it is a link that explained how to generate a 2000volts DC pulse using a Mosfet. Maybe it may helping you in your design.
Output of power MOSFET Marx bank Ideally a 2000 V pulse would be... | Download Scientific Diagram
For you consideration attached it is a link that explained how to generate a 2000volts DC pulse using a Mosfet. Maybe it may helping you in your design.
Output of power MOSFET Marx bank Ideally a 2000 V pulse would be... | Download Scientific Diagram
And that´s precisely the point.
SSRs expect Mains voltage, UP TO 400VAC which would mean around 600V peaks.
For safety margin they are usually designed to stand twice as much, as ABSOLUTE MAXIMUM rating.
But you are **starting** with 1500VDC, you need again twice as much for safety.
To boot you are discharging that capacitor bank into a HUGE inductor (the magnetizing coil) so peaks can be anybody´s guess.
You will also switch hundreds (or thousands) of Amperes.
To have at least an idea of what you need, please tell us capacitor bank capacitance and voltage, so we can calculate the Joules involved, plus magnetizing coil details (diameter, turns, DC resistance) so we may estimate peak amperes.
A picture or two could help.
The high current and possible arc voltage is confirmed by relay contacts sticking together.
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@JMFAHEY
The info you asked i can provide
Capacitance volt ampere and voltage involved. I will collect all the details and revert.
You explained it in a way that i understand����
The info you asked i can provide
Capacitance volt ampere and voltage involved. I will collect all the details and revert.
You explained it in a way that i understand����