Lech
Newbie level 2
[MOVED] HF igniton arc for TIG welding machine.
Ithing about a HF spark igniton to my TIG welding machine.
I fint this solution, unfortunately, there is somewhat strong car and welding.
In the first stage I need to understand the function
T2 works as high voltage (kV) power supply , 10kV 50Hz
Spark gaps limits the maximum voltage when output not loaded
C1 stop DC current, but I do not know why it's dimensiated to 12600V
T2 works as transformer, transmit AC HF to high current DC welding current.
1. First and crucial question
Is the transformer flyback transformer or Forward transformer? In other words, the primary and secondary wines are in agreement or disagreemen?
2. Spark gaps is relative big and inacuurate voltage limiting element I thing better and smaller solution is severel MOV resisotr in series possibly or with High Voltage Gas Discharge Tube.
Am I right?
3. HV source solution from DC 24V to 6-10kV AC.
My first idea. Isolatet Flyback converter witout feedback.
Flyback transformet 1:250 secondar winsing with several (6 or more) section.
On primat MOSFET as switching element controlled directly from MCU as PWM 40-100KHz.
ON secondary side is power consumet with igniton arc or in not arc destroyed in MOV resistor battery .
it's a big nonsense?
4. Suppresion caps.
2x5pcs 47nF paralale = 1x470nF with paralel 1x 2,35M or 470k dischrge resistor
protect the semiconductors on the output from overvoltage
In case of a 50Hz HF converter, I do not quite understand how it works?
5.
What power is needed to arc the arc at a distance of 3-8mm?
What parameters affect the quality of the arc? Freqvency of AC?
Thank all for help
Ithing about a HF spark igniton to my TIG welding machine.
I fint this solution, unfortunately, there is somewhat strong car and welding.
In the first stage I need to understand the function
T2 works as high voltage (kV) power supply , 10kV 50Hz
Spark gaps limits the maximum voltage when output not loaded
C1 stop DC current, but I do not know why it's dimensiated to 12600V
T2 works as transformer, transmit AC HF to high current DC welding current.
1. First and crucial question
Is the transformer flyback transformer or Forward transformer? In other words, the primary and secondary wines are in agreement or disagreemen?
2. Spark gaps is relative big and inacuurate voltage limiting element I thing better and smaller solution is severel MOV resisotr in series possibly or with High Voltage Gas Discharge Tube.
Am I right?
3. HV source solution from DC 24V to 6-10kV AC.
My first idea. Isolatet Flyback converter witout feedback.
Flyback transformet 1:250 secondar winsing with several (6 or more) section.
On primat MOSFET as switching element controlled directly from MCU as PWM 40-100KHz.
ON secondary side is power consumet with igniton arc or in not arc destroyed in MOV resistor battery .
it's a big nonsense?
4. Suppresion caps.
2x5pcs 47nF paralale = 1x470nF with paralel 1x 2,35M or 470k dischrge resistor
protect the semiconductors on the output from overvoltage
In case of a 50Hz HF converter, I do not quite understand how it works?
5.
What power is needed to arc the arc at a distance of 3-8mm?
What parameters affect the quality of the arc? Freqvency of AC?
Thank all for help
