Elektor Labs are forever working on new projects and ideas. At the moment I am working on a USB isolating circuit. Besides isolating its data lines, it is also important to isolate its supply lines. Because the USB is DC powered, a traditional isolation transformer can not be used. I reverted to an isolated flyback converter instead. This solution also required a transformer, albeit a small one. The one I picked for the job goes by the arcane name 'part# 750310471' from manufacturer Würth Elektronik.
This little transformer is production-tested for one second at 1850 volts. From this the manufacturer extrapolates that the device withstands 1500 volts for one minute continuously. The primary and secondary side are both shorted during this test so no current will flow through its windings. This confirms the isolation between the primary and secondary side.
That's nice & all, but what I'd really like to know is what happens when something goes wrong in a real situation. What if, for example, on one side the ground plane is shorted to the live wire resulting in the local AC powerline voltage continuously being superimposed on one side for hours and perhaps even days? This hasn't been tested by the manufacturer (at least I didn't find it in the documentation), but I did need this information to be able to proceed with my project. So off to the test bench and hook it up!
Fused and connected using a variable autotransformer (Variac),
elektron Elektor transformer testing | |
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| Science & Technology | Upload TimePublished on 12 Apr 2012 |
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