Re: Aw: Re: AW: Re: Re: Re: AW: [EVGRAY] Re: All information about Diode Plug.

Body

Hi Sven,

"There are many auxiliary thyristors gone without the diode a series resistor for current limiting I have installed for the auxiliary thyristor as in the drawing. The ignition of the power thyristors has worked very well so far, my idea is more likely to high sensitive thyristors that can be switched with μA thereby would be wasted little energy for the ignition and perhaps rather the synchrony of the system can be achieved."

Diodes don't limit the current very much as they're good conductors in the forward conduction direction. They have a forward conduction voltage drop of around 0.7V or a little more when at heavy load.

"The diode between reactor (Variac) and discharge capacitor should prevent a resonance that can arise between the reactive components"
The other two diodes at the other end of the variac already prevent the current from going in the opposite direction of the first diode at the top end. The top end diode is in series with the double split diodes and the current form either one of the split diodes also goes through the top end diode. Thus the top diode is only introducing another voltage drop (power dissipation) for current going through the variac. This is the brother in law effect (if one's brother in law sells diodes).

Regards
Ole

 

---In [email protected], <s.friedrich@...> wrote :

 Hi Ole, first of all many thanks for your help, I will consider the change with positive diode plugs the ignition energy is removed after the transformer coil and the left diode directly from the capacitor. The charge curve and discharge curve of the two capacitors are almost identical now perfect, now you can work on the vote.
 
 
 
 "The small diodes are protecting the small thyristor as the gates of the thyristor are very low ohmic in both directions."
 Use resistors instead of diodes when they start conducting. A slight change in voltage gives a big change in current as they are very nonlinear devices "
 
 There are many auxiliary thyristors gone without the diode a series resistor for current limiting I have installed for the auxiliary thyristor as in the drawing. The ignition of the power thyristors has worked very well so far, my idea is more likely to high sensitive thyristors that can be switched with μA thereby would be wasted little energy for the ignition and perhaps rather the synchrony of the system can be achieved.
 I think that is still a long way, but a very interesting experiment.
 
 
 "And why did you mark the Variacs and the protective diodes at the gate of the thyristor power?"
 The variacs have the two bottom diodes prevent any current from changing direction. Thus the top diodes at each variac can be omitted as the current through the variacs never changes direction. The voltage across them will change depending on receiving energy or supplying energy."
 
 The diode between reactor (Variac) and discharge capacitor should prevent a resonance that can arise between the reactive components. I will send you the original circuits.
 
 regards
 
 Sven  ...