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Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Here is the EPCOS ferrite data book. Page 6 gives a summary of properties of various ferrites, and states that N27 is good for 25-150kHz and N87 is good for 25-500kHz. Other app. notes state up to 100kHz for N27 and 50-500kHz for N87. Plenty of info in this book, though:
]data_book_-_ferrites__accessories.pdf[/file]
(EDIT: as a general rule, N27 is used up to ~100kHz and N87 from ~100-500kHz)
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
The schematic does not make sense. A 12 V (V2) source is connected in a strange position, other connections are also strange, the transformers are ideal, capacitors and resistors are too big. I suggest simulating small sections first, making sure that they do what you want before trying to simulate a complete circuit, what results in a difficult puzzle to find what is wrong. (The same applies to actual circuit construction.)
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
Andy wrote ...
Hi Antonio Why is V2 in a strange place?, I know the transformer is ideal, making it not the circuit work but the pulses aren't square(I'm happy with that). I've rebuilt the circuit with smaller resistors, 100ohm, but are the capacitors meant to be smaller than 100nF?
V2 is forcing the input of the 4009 (obsolete part) to high level. The crystal oscillator seems incorrect anyway. The upper part of the circuit looks totally confuse...
Registered Member #1792
Joined: Fri Oct 31 2008, 08:12PM
Location: University of California
Posts: 527
What is the goal of this circuit, simply to upconvert 12V to a higher voltage? To drive what kind of load?
Why the crystal oscillator? Seems like a 555 would be simple and easy unless you need the frequency accuracy.
When scoping out a simulation of a circuit like this it's also good to scope out the gate drive and drain current waveforms. Push pull topologies like this I know are also susceptible to transformer flux walking since the waveforms on the two primary won't be identical, not sure how big an issue it will or will not be in practice.
wrote ... If for 1kw I'll need 1.7mhz,
If you drive your transformer at 1.7 milli-Hertz you better have a really large core ;)
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
The oscillator circuit is incorrect. The usual configuration has just one inverter, not two. Probably there is no oscillation, and the mosfets are conducting continuously.
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
C4 and V1 don't have any function connected in this way. The capacitors are too large, and the resistor possibly too small. Look at the design in the site in the link that I sent, that shows C1 and C2 in the pF range, and another resistor. Did you connect the power pins of the inverter chip? Make it sure first that the oscillator alone is working, in the simulated and built versions. To verify if oscillation is present, use the multimeter in AC, but with a capacitor in series to eliminate any DC voltage. Otherwise use only the DC ranges.
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Ferrite transfomer what do you varables do you use for a core
