Kapanadze Cousin - DALLY FREE ENERGY

[magpwr]

Sure, 330 nS are in hundreds and i didn't yet consider fall times and rise times. that's just an example of calculation. and i don't think we need to make a signal with 1 ns precession , by now duty cycle is the key i guess.

what do you mean " You are Still off By two orders of magnitude" ?,   HA...    HA...

--------------------------------------------------

maybe we can make 1 % duty cycle.

if  F =  300 Khz    AND   Duty cycle=  1 % then    3,3us / 100 = 33ns
if  F =  1 Mhz      AND   Duty Cycle=  1 % then    1  us /  100 = 10ns   

now we have  PWM 3525 to generate signal up to 1Mhz by magpwr and TK 830 Khz.
...

hi,

It's suppose to be "3825" for max 1mhz.The lowest duty cycle i have got is around 4% at 230khz.

[Thaelin]

Enjoy your RF burns at that freq. That is why most of the circuits
stay fairly low as not to emit too much. Not going to be good for
the body.

thay

[zcsaba77]

hi,

It's suppose to be "3825" for max 1mhz.The lowest duty cycle i have got is around 4% at 230khz.

... and at 1MHz how low was duty cycle %?

[magpwr]

... and at 1MHz how low was duty cycle %?

hi zcsaba77,

The highest i have done was nearly 500khz while selecting right capacitors for the PWM I/C.There is no requirement for me to go higher because the average common mosfet and igbt would stop working after certain frequency is reached.Base on datasheet the lowest duty cycle is 3%.

My most expensive CREE mosfet in my possession cost $16USD per piece as sold in digikey is able to produce nice waveform up to around 310khz using 20volts signal at gates.

If you are just playing around with yoke and other ferrite core the 3525 or TL494 will do.

Air core would need frequency higher than 200khz base on my findings.

[Hoppy]

Hi Hoppy,

the choke is extremely sensitive concerning this special mode.
The used 250uH choke is just on the border, when i tested with 800uH, 5.5mH and 7mH chokes, they all caused the Mazzilli to go into this special mode (@24v INPUT).

I will reposition this choke (close to the input terminals) on my circuit to see if the present location perhaps is causing the feedback/oscillations.


Thanks,  regards Itsu

Hi Itsu,

You say that the 250uH is just on the border. Have you tried reducing the inductance? I have less than 250uH.

Regards
Hoppy