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By stanyJune 3, in Power Electronics.
Hey guys, I’m a new member to this forum, so I have no idea if this topic has arisen before. I have a project coming up where Datsheet need to hold off about volts using an SCR.
A single device with this type of holdoff is really expensive, so I’m looking for an alternative solution.
2N4444 – SCR, V(DRM) = 600V TO 699.9V
Years ago, I read or heard of someone putting two SCR’s in series to achieve higher voltage rating. Anyone out there with any experience in this application???
Off my head, I cant just ramble out the way it works, but I’ll look through the schematics and the theory book tommorow at work and try to get you a more definitive answer. From what I have seen they use pulse transformers to trig from a lower voltage to achieve simultaneous response. Look at this AP-note http: PDF Datashet gives you the basic idea, but there are other problem issues dtasheet mentioned here.
Let’s look at a typical hookup using two 2N’s in series. We want to use it in a V application.
We connect it as shown in the first diagram, but find that the load turns on when we connect the power, even with no trigger applied. The problem is the leakage current that may vary from 10uA at a cold junction temperature to 2mA for a hot junction. In the diagram I used a leakage for 10uA for the one and about 20uA for the other.
We can see that D1 with the lowest leakage will have more than its rated V over it. This will cause voltage breakdown of D1, followed by breakdown of D2. We need to create a additional leakage path greater that the worst leakage spec in order to balance the voltages. If we take 3mA to be very safe, the voltages balance out but we have to live with the high leakage current through the load, which may be a problem for the application.
Also note that we will be generating a fair amount of heat in the balancing resistors as shown on the wattmeter.
2N – Digiware Store
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