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HV diode
Posted by vasil on 1/27/2005, 4:09 am Brown Boveri BBC Si-E 9000/4000 - 3.0 I know that BB is a company that made kW transmitters, but they dont have any component data on the site. Are they useful for some HV experiments? I was suggested to phone to company, but it is not so simple from where i live. vasil
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Re: HV diode
Posted by Bert Hickman on 1/27/2005, 4:28 pm, in reply to "HV diode" Hi Vasil, This is a common problem. For example, I have three large 19" x 1.25" x 2.25" rectifier sticks that I can't get any specs for, and I don't have a DC supply that goes high enough to test them. Your best bet is to contact ABB (the current parent company) to see if they can provide you with any information: Since these devices were originally part of a transmitter, they may also have internal/proprietary part numbers, making them even more difficult to track down. You may be able to measure the "knee" of the reverse breakdown voltage (Peak Inverse Voltage) by connecting a high voltage resistor (one that's capable of holding off the applied voltage) in series with a current meter and the rectifier. The series resistor must be able to limit the current to 1 MA or below at maximum voltage. Connect the rectifier so that it's blocking current (reverse direction), and slowly increase the voltage while monitoring the current via a 0-500 uA microammeter. Once the rectifier begins to break down, you should begin to see a significant increase in current. The safe PIV will then be 75-80% of this value for that particular diode chain. However, because these rectifiers are so long, they may easily be rated for 25 kV - it may be difficult to provide sufficient voltage to perform this test. Also, this test will not tell you the safe current rating for the device - for this you really need to get information from ABB. Would it be possible to get schematics of the transmitter that they came from? From the size of them, they sound like they could handle just about anything you could throw at them, and they are likely capable of multi-ampere current levels. Nice find! I don't know if it's related, but IXYS does make a 24kV 5A rectifier that seems to have a similar part number (Si-E 9000/4000-0.7) - see: -- Bert --
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Re: HV diode
Posted by Karl on 10/25/2005, 2:12 am, in reply to "Re: HV diode" ref --Previous Message--
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Re: HV diode
Posted by Bert Hickman on 10/25/2005, 7:36 am, in reply to "Re: HV diode" Bert --Previous Message--
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