Kapanadze Cousin - DALLY FREE ENERGY

[itsu]

Starcruiser,  Jeg,

yes, this T520-2 toroid is designed for HF use, see:

Al Values listed in µH/100 Turns
Permeability = 10
Frequency Range 2 Mhz - 30 Mhz
Color = Red
Inner Diameter: 3.080
Outer Diameter: 5.200
Height: 0.800
AL Value: 207


I hoped it would be more stable, but it seems i have to manipulate the turns ratio now.

Itsu

[magpwr]

hi everyone,

I have just uploaded video of my PWM generator running on 1xLi-ion battery (isolated/test supply) and working at 250VDC at 20% duty.

http://www.youtube.com/watch?v=cGRPKNhC_TE

The voltage across 3 turn on toroid is around 194Vpp at 1.5x Amps at 12.x Volts.

The 28turns behave like a NST running at 28khz and produce around 2kvpp.

I have not figured out what to do with this high voltage beside maybe running as spark gap tesla coil.(No plans for that)

I have finally implemented a varistor 80pf 620volts rated.This does not increase current draw at the power supply for inverter at all but merely serve as additional protection for the 1.2kv mosfet.

[Void]

I have just uploaded video of my PWM generator running on 1xLi-ion battery (isolated/test supply) and working at 250VDC at 20% duty.

Looks good Magpwr.

[verpies]

Thanks Verpies.
I am in changing my yoke today to a lossless one. Will it be any advantage if I use it in combination with my dissipative snubber? Won't it cut this way all this ringing that we see in Itsu's setup?

The lossless clamps only affect the drain signals above 2*V_CC.
The dissipative snubbers should do that, too.  If they also affect the drain voltage below 2*V_CC, then they are fighting the MOSFETs, because MOSFETs operate in this voltage range by design.  Fighting the MOSFETs is bad - it's like pressing both the car's brake and accelerator at the same time.
Note, that ringing below 2*V_CC does not constitute a danger to your MOSFETs.

Itsu's ringing is primarily caused by the leakage inductance ...mostly.  Eliminate that with a proper winding and you will eliminate most of the ringing below 2*V_CC.

[Void]

Itsu's ringing is primarily caused by the leakage inductance ...mostly.  Eliminate that with a proper winding and you will eliminate most of the ringing below 2*V_CC.

Hi Verpies. What is the proper type of winding to reduce leakage inductance?