Author Topic: MOSFET Protection in SSTC  (Read 311 times)

Offline Gisho

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MOSFET Protection in SSTC
« on: May 12, 2021, 09:36:35 AM »
I came across this slayer exciter circuit that looks quite simple and so I decided to make this a high-quality build ;)
But I also want to run this for a long period of time which means that the circuit needs to be re-designed 
My main concerns are to,
1.Protect the mosfet
2.Run the circuit for a (very) long time
3.Possibly increase performance  ;D

I'm using an IRF530 fet and 2 x19V laptop chargers(LPS) in parallel.
Secondary coil is ~1000 turns of 0.1mm wire on a 3.1cm diameter pipe.
I'm desperate to give the best protection for the mosfet
« Last Edit: May 14, 2021, 11:14:04 AM by Gisho »

Offline Mads Barnkob

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Re: MOSFET Protection in SSTC
« Reply #1 on: May 14, 2021, 09:48:27 AM »
This thread is on the verge of breaking rule #2: https://highvoltageforum.net/index.php?topic=31.0

1. MOSFET protection resonant/inductive circuits is well-documented in many places, use google.
2. Heat dissipation and management is well-documented in many places, use google.
3. Higher voltage / more turns on secondary.

I am looking forward to see your replies with suggested improvements you want to try, then we can talk about those. Afterall you did write "...which means that I need to re-design the circuit."
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Offline Gisho

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Re: MOSFET Protection in SSTC
« Reply #2 on: May 16, 2021, 07:34:48 AM »
I added an extra diode(1n4004)  between source-drain to reduce load on the internal diode. I also added a gate-source resistor and soldered the circuit together with a fairly big heatsink attached (I initially breadboarded it  :D:P) to reduce the stray inductance , but the fet is still finger-burning hot after a 2 min run.

Offline Power-Max

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Re: MOSFET Protection in SSTC
« Reply #3 on: June 03, 2021, 04:52:20 AM »
I added an extra diode(1n4004)  between source-drain to reduce load on the internal diode. I also added a gate-source resistor and soldered the circuit together with a fairly big heatsink attached (I initially breadboarded it  :D:P) to reduce the stray inductance , but the fet is still finger-burning hot after a 2 min run.

1N4004 is a slow diode meant for mains rectification. Take a look at the specs, specifically junction capacitance and especially reverse recovery time. You want a diode that has a reverse recovery time measured in nanoseconds. The UF4007 comes to mind. small signal diodes (like 1n4148) come to mind for low currents and medium voltages, and schottky diodes come to mind for high currents and low to medium voltages.

Offline SalinsLV

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Re: MOSFET Protection in SSTC
« Reply #4 on: June 04, 2021, 09:33:43 AM »
This circuit will result in a pile of dead mosfets if you're not careful(speaking from experience). You can try adding 1.5ke15ca at the gate and 1.5ke400ca at the source/drain. This slayer exciter is great for quick sparks but it can be hard to get longer sparks. The longest i've achieved were 40cm long.
Krisjanis Salins

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Re: MOSFET Protection in SSTC
« Reply #4 on: June 04, 2021, 09:33:43 AM »

 


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