 zvs driver frequency
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OnTheWaterfront
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Sat Nov 17 2012, 09:35PM
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Registered Member #7113
Joined: Mon Oct 08 2012, 11:31PM
Location:
Posts: 9
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How can I increase the frequency of my ZVS driver? It runs at about 28khz when I use it to drive flybacks I've salvaged from monitors, but when I use it on a flyback I purchased from amazing1.com it runs at only 11khz and I think the current output is suffering as a result. Any tips?
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Dr. Dark Current
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Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
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It is a resonant LC circuit so the frequency is determined by the L and C in the circuit, f = 1 / (2pi * sqrt (LC)) .
The free running frequency is determined by the magnetising inductance of the core (or in some cases by core saturation), the loaded frequency is determined by the magnetising inductance in paralel with leakage inductance.
So, how to increase frequency:
-Decrease the capacitance
-Decrease the number of turns
-Decrease the air gap in core (influences mainly the free-running frequency)
-Increase coupling of primary and secondary (influences mainly the loaded frequency, increases power transfer)
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