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Mazzilli converter erroneous behaviour

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LAN_403

TheMerovingian

Wed Oct 14 2009, 10:12PM

Registered Member #14 Joined: Thu Feb 02 2006, 01:04PM
Location: Prato/italy
Posts: 383

I have built a mazzilli-based dc-dc converter to step 12V to 220-250VDC at reasonable power levels for fluorescent lighting (they work also with DC) with input voltage control for battery protection (histeresis). When the battery is lower than 10.8V the converter swichs off (pulls the gates of the mosfets go ground) and it stays off till the voltage doesn't increase back up to 12.1V. The control part works ok, instead the converter has some problems. THe waveforms are OK (sine) but the voltages are too high. With a supply voltage of 14V it should have a primary voltage of 36V and a secondary of 250V, it gives instead 65V on the primary and 450V on the secondary. Thy the primary voltage is so high, shouldn't be Vin*pigreco?

I already check:
the transformer air gap
the inductor
waveforms
operating freq (48KhZ)

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