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mortod
Joined: 13 Nov 2003 Posts: 22 Location: London |
Posted: Tue Feb 16, 2010 11:39 am Post subject: nayone know anything about power inverters? |
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Have a faulty power inverter - ie one that produces 240V AC from 12V DC. Its a 1500W model and quite a beast inside (some 8 transformers and 16 MOSFETS).
I can't spot anything visibly faulty. Any thoughts on what I should be testing for? My only thought is to remove and test each of those 16 mosfets in turn. |
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zaphod7501
Joined: 02 Aug 2004 Posts: 534 Location: Peoria Illinois |
Posted: Tue Feb 16, 2010 7:16 pm Post subject: |
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Devices that use Mosfets can be very difficult to repair.
Many times the Mosfets are in parallel so you have to disconnect them to find a shorted one. You should check for open fuses or a thermal relay that did not reset At high current, those transformers can fail also but cannot be checked with simple ohm meters. You should also examine the solder connections carefully since high current can melt them or cause some arcing.
Due to the nature of inverters, I would limit repairs to things like open connections, fuses, relays and what are basically "mechanical" failures. Some of the electronic failure modes could be undervoltage or overvoltage conditions which could destroy the device connected to it. _________________ Just call me Zaphod (or Steve) --- I never should have started using numbers in a screen name but I just can't stop now. |
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