Have any idea?I'm stuck at the point "Inverter/Chopper". How do I create clock pulses from such a very high voltage level? Is there any IC for this purpose, or do we use a simple oscillator circuit using high voltage circuit elements?
I'm stuck at the point "Inverter/Chopper". How do I create clock pulses from such a very high voltage level?
Can you please name several of those ICs, they are what I was looking for.You don't. The IC's that create the pulses consume very low power, and are operated from simple low current, low voltage power conversion networks, usually consisting of resistors, capacitors and zener diodes.
I googled it, but the results are the circuits which are reducing voltage level by using capacitors, and rectifying by zeners. That's not what I'm trying to accomplish. I want to create clock pulse at 310V DC voltage level.Goolge "transformerless power supplies" to get an idea how simple these networks are.
I googled it, but the results are the circuits which are reducing voltage level by using capacitors, and rectifying by zeners. That's not what I'm trying to accomplish. I want to create clock pulse at 310V DC voltage level.
You don't.
Thanks for the information, I will search more data about switch mode transformers.
What about this matter?Have any idea?
Thanks in advance.
Ok, I will search more about flyback and forward driving techniques.There isn't enough impeadance on your transformer's primary to effect a decent voltage change on the transistors's drain connection. Transformer drivers aren't typically constructed that way. You need to decide what "mode" you want to drive the transformer with (flyback, forward) and then construct the driver properly, when a transformer constructed to work with the driver, frequency, current, etc. Just winding a few turns on a core and running it isn't going to do much for you.
I will try winding more turns tomorrow.Judging by the size of the core you could possibly need more turns on the primary. Try another 5 turns and see if the performance improves.
Do you have a way to post scope pictures in this thread?
That thing took my attention, and I was just about to try it...I think you have a 10k resistor feeding the gate of the Mosfet. It should be only 68 ohms so that the high capacitance of the gate can be quickly charged and discharged.
I increased the circuit frequency, new frequency is 57kHz.When i first looked at this i didnt realize you were working at such a low frequency like 20kHz. You probably have to boost up to 50kHz at least because 20kHz will probably require too many turns for that small core. To know for sure however, post your core dimensions including ID,OD,HT, which is inside diameter, outside diameter, and height of the core when it is laying flat. Dimensions in mm would be good if you can.
It would be good to know the material the core is made up of too.
**broken link removed**Another informative scope pic would be of the power supply itself, right across the two rails on your plugboard. It looks like this design, as is, may be pulling the dc voltage down quite low for a time and that will screw up the timing quite a bit.
Primary winding current appears to saturate if I rise supply voltage higher than 7.5V (when Vcc < 7V overall circuit draws less than 0.1A, when Vcc > 8V, it draws 1A. Current drawing monotonically increases by Vcc, but there is a huge increment at Vcc = 7.5V), or run the circuit in 100kHz.Another very important scope pic would be of the primary current in the transformer. This is what really tells the story about if we are saturating the core or not. To get this kind of scope pic, you can insert a small resistor like 0.1 ohms in series with the primary and measure the voltage across that resistor and scale it so we can see a decent waveform. Of course if you own a good current probe that would be even better. This test is like the number 1 test to be performed and is very very important, especially since this kind of design is going to cause net DC in the primary which can easily saturate the core all by itself.
Do you by any chance have a way to gap the core if need be? Probably not, but thought i would ask anyway.
This time I connected a 100Ω resister, what if I remove that resistor and just short circuit output of 555 and gate of 6N60? Gate of a MOSFET has super high input impedance, isn't it?As audioguru says, if you have a 10k resistor in series with the gate this thing may never work right
Must be a lower value. Thanks to audioguru for noticing that.
You need to decide what "mode" you want to drive the transformer with (flyback, forward) and then construct the driver properly…
It would be good to know the material the core is made up of too.
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