Diode 2XH. Original Part No Code. Original Part No. Start here to find high quality 2XH products from audited 2XH suppliers and.

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Privacy Terms. Quick links. This forum is for specialized infomation important to the construction and safe operation of the high voltage electrical supplies and related circuitry needed for fusor operation. Re: bidirectional diodes?

Could you provide a more useful title? The literal answer is: I think microwave manufacturers have used these as protection diodes Not spending that time may otherwise be a false-economy - if you get my drift viz. It is going to be [as far as I know] a clamping diode that forces a fuse to blow if the voltage from the transformer runs too high, such as if a rectifying diode goes bad but doesn't lead to a blown fuse I'm sure I'll be corrected if I have that wrong. You need a rectifying diode, if your hope is to use it to drive a high voltage DC.

As far as I know, this isn't a rectifying diode. It is placed in parallel with the HV capacitor in the usual level-shifted magnetron power supply which uses a separate rectifier in series with the capacitor. Its purpose in that configuration is to allow the capacitor to charge to a high voltage of the correct polarity only negative at the magnetron cathode , which is blocked by the high-breakdown diode in the back-to-back arrangement. If the capacitor experiences high voltage of the opposite polarity, the weaker diode in the pair fails.

I don't know precisely what condition is being protected against, but my guess is that a high reactive current circulating through the transformer-capacitor pursuant to a failed main rectifier or gassed-out maggie could cause one or both of these components to not "go gentle into that good night. Or the transformer secondary could melt down before the core thermal protector opens, ruining the component with the highest commodity value.

Engineering of a cheap Chinese appliance is all about pushing the envelope and trimming the margins of safe failure. In any case, I suspect the "protection diode" is only designed to carry current in the permanently-failed state, making it not worth much to you.

I used to make a living repairing microwave ovens 'til they got to cheap to repair anymore. The short protector will cause the line fuse to blow in the above fault conditions. The device will not conduct in any direction, therefore has no effect on the circuit under normal operating conditions. The peak inverse breakdown voltage of D1 is 6kV and D2 is 1. Under fault conditions when a short circuit occurs the peak inverse voltage of D2 will be exceeded, this will cause the diode to go short circuit.

This in turn will cause a very high forward current through D1, causing it to go short circuit also. This will cause a dead short to appear across the high voltage transformer secondary, which will blow the line fuse, removing power to the high voltage transformer. Welcome to fusor. Thanks for that informative post. Some fine print in the registration dialog says new users are supposed to post a personal introduction in the obvious sub-forum.


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