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Registered Member #187
Joined: Thu Feb 16 2006, 02:54PM
Location: Central Ohio
Posts: 140
lamazoid wrote ...
Also try to add a gap into flyback core.
Adding an airgap (or not removing the spacers to close the gap) generally just reduces the effeciency of the circuit by introducing stray inductance. It adds "resistance" to the inductive circuit and less energy is transferred from the primary to the secondary.
The airgap is only there to reduce the saturation of the core when used in actual "flyback" service, such as in a CRT device.
An airgap can help cut the squeal if your flybacks are large AC type (like mine) with the resonant frequency very close to audible range, but in general the airgap is undesirable.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
cbfull wrote ...
Adding an airgap (or not removing the spacers to close the gap) generally just reduces the effeciency of the circuit by introducing stray inductance. It adds "resistance" to the inductive circuit and less energy is transferred from the primary to the secondary.
I was actually many times surprised how adding an airgap has dramatically increased the efficiency of my flyback drivers.
Registered Member #187
Joined: Thu Feb 16 2006, 02:54PM
Location: Central Ohio
Posts: 140
jmartis wrote ...
I was actually many times surprised how adding an airgap has dramatically increased the efficiency of my flyback drivers.
That's very interesting. The effeciency actually increased? I wonder if the type of circuit has anything to do with it. I noticed when experimenting with airgaps that removing them made the output a bit more intense, and the transistors did not heat nearly as much for the same power input.
Any extra details about your circuit might help me to understand how this could happen.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
cbfull wrote ...
That's very interesting. The effeciency actually increased? I wonder if the type of circuit has anything to do with it. I noticed when experimenting with airgaps that removing them made the output a bit more intense, and the transistors did not heat nearly as much for the same power input.
Any extra details about your circuit might help me to understand how this could happen.
The biggest improvement in performance was with half bridge driver and "diode-split" flyback. The FETs were much cooler and the output stopped "screeching". It also helped in other drivers- the "zvs" type, and of course in single-ended driver, where the gap is essential for storing energy, and adjusting it changes the performance a lot.
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help requested on getting flybacks to work
