It should be very simple and you can make it to work by trail and error.1. Best toroid type to use? Many different options out there when it comes to colors and specs.
2. High or low permeability?
3. Wire size smaller or larger with more or less wraps? What range in uH values are best for efficiency?
4. Single layer wraps only or can I wrap over existing wires when making my toroid?
Those questions are questions of newbie. Firstly read a electrotechnic book, then you will able to design it.1. Best toroid type to use? Many different options out there when it comes to colors and specs.
2. High or low permeability?
3. Wire size smaller or larger with more or less wraps? What range in uH values are best for efficiency?
4. Single layer wraps only or can I wrap over existing wires when making my toroid?
If he wasn't a newbie, he'd know how to do it, and he wouldn't be asking.Those questions are questions of newbie.
If he wasn't a newbie, he'd know how to do it, and he wouldn't be asking.
Voltage Spike:Try here as a starting point.
From my point of view good book is book that actually helps you to rise. When i was trying to calculate and design coils / transformers i have tried several sources/ books. When i was not satisfied i skiped to another one... When i started i failed to often. I started just by observation. I chose random cores, random number of turns, i made my own control boards and it obviously did not work. So i gathered some equations from websites. It was actually working. Well it works but it suffered from loud high noise and overheating. Than i readed some book about theory of magnetic field and another about transformers. Now its way better. I dont have teacher. My teacher failure is.
You can calculate inductance of coil using eq. L=U*dt/di. Here is schematic for control board. I have built this schematic and adjusted frequency fo be around 10Hz. On time - Ron*Ct, off time Roff*Ct.Ok, thanks for the info and link to that book. I am definitely going to be winding some cores. And I have an old low MHz oscilloscope too along with other hand held meters. I may have to buy an inductor tester though. I don't give up easy. Just never messed around with toroids before.
Thanks
Thanks for the equation for calculating the inductance. If I see the need I may have to whip up a Visual Basic program for calculating some of this stuff. You will have to explain the pic or schematic for the control board you linked. I clicked on the second link too but the web page is all in Czechoslovakia language. Maybe I can find a converter on Google and cut and paste.You can calculate inductance of coil using eq. L=U*dt/di. Here is schematic for control board. I have built this schematic and adjusted frequency fo be around 10Hz. On time - Ron*Ct, off time Roff*Ct.
Choze - Indukčnosti a vlastnosti jader I
Jak měřit indukčnost za podmínek blízkých provozu v pulzních zdrojích?choze.aspone.cz
Basicaly ir2151 is pwm controller. Its turning mosfet on and off. On time is adjusted by Ron*Ct, and off time by ROff*Ct. By adjusting on time you can get to point when relative permeability drop to 1 in other words core is fully saturated. In practice coil is usable in linear region- stable inductance- current is rising lineary...By adjusting off time. You can adjust numbers of cycles. In other words wasted energy... W - L*i*i/2*frequencyThanks for the equation for calculating the inductance. If I see the need I may have to whip up a Visual Basic program for calculating some of this stuff. You will have to explain the pic or schematic for the control board you linked. I clicked on the second link too but the web page is all in Czechoslovakia language. Maybe I can find a converter on Google and cut and paste.
Ok, I see now. You are using pwm to control the transistor. The one I am going to make just uses a transistor 2N2222 NPN and a coil and resistor to light an LED. Your design is more advanced but I can learn from it for advanced projects. I am making a low input version that uses a AA battery. But all of the info you are sharing is very good. I just need to study the math and formulas part and become familiar with the different properties and their names. But I will work hard at it.Basicaly ir2151 is pwm controller. Its turning mosfet on and off. On time is adjusted by Ron*Ct, and off time by ROff*Ct. By adjusting on time you can get to point when relative permeability drop to 1 in other words core is fully saturated. In practice coil is usable in linear region- stable inductance- current is rising lineary...By adjusting off time. You can adjust numbers of cycles. In other words wasted energy... W - L*i*i/2*frequency
This is neccesary! You dont want to blow you coil...
You are measuring voltage on .11R and using ohms law calculating current in coil. Also you need to measure time...
Ok. Schematic i posted is onky for coil measuring. I think i used irf3205 or irfz44n as transistor.Ok, I see now. You are using pwm to control the transistor. The one I am going to make just uses a transistor 2N2222 NPN and a coil and resistor to light an LED. Your design is more advanced but I can learn from it for advanced projects. I am making a low input version that uses a AA battery. But all of the info you are sharing is very good. I just need to study the math and formulas part and become familiar with the different properties and their names. But I will work hard at it.
Thanks
Ok, thanks for that info. Your circuit looks like a high power version based on the components used. Is that your website? Just curious as it looks like an informative place to get info although harder to use based on language difference. Sometimes websites have a button at the top where you can change language. No big deal as I can use Google Translator.Ok. Schematic i posted is onky for coil measuring. I think i used irf3205 or irfz44n as transistor.
No, its not mine. I just remember that site becouse i used it when i started.Ok, thanks for that info. Your circuit looks like a high power version based on the components used. Is that your website? Just curious as it looks like an informative place to get info although harder to use based on language difference. Sometimes websites have a button at the top where you can change language. No big deal as I can use Google Translator.
Can you imagine someone asking how much flour to use to make a loaf, getting the answer. "Try a kilo; if that ain't right try halving or doubleing it".I chose random cores, random number of turns, i made my own control boards and it obviously did not work. So i gathered some equations from websites. It was actually working. Well it works but it suffered from loud high noise and overheating. Than i readed some book about theory of magnetic field and another about transformers. Now its way better. I dont have teacher. My teacher failure is.
Just dont give up.
Yes, thats how some computing actually works.Can you imagine someone asking how much flour to use to make a loaf, getting the answer. "Try a kilo; if that ain't right try halving or doubleing it".
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