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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. This will cause voltage breakdown of D1, followed by breakdown of D2.
2n transistor NPN datasheet & applicatoin notes – Datasheet Archive
Anyone out there with any experience in this application??? The problem is the leakage current that may vary from 10uA at a cold junction temperature to 2mA for a hot junction.
Let’s look at a typical hookup using two 2N’s in series. Also note that we will be generating a fair amount of heat in the balancing resistors as shown on the wattmeter.
From what I have seen they use pulse transformers to trig from a lower voltage to achieve simultaneous response. Sign in Already have an account? In the diagram I used a leakage for 10uA for the one and about 20uA for the other.
We need to create a additional leakage path greater that the worst leakage spec in order to balance the voltages. Posted June 6, A single device with this type of holdoff is really expensive, so I’m looking for an alternative solution.
Sign In Sign Up. 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.
Posted June 4, You need to be a member in order to leave a comment. Look at this AP-note http: Years ago, I read or heard of someone putting two SCR’s in series to achieve higher voltage rating. Sign up for a new account in our community.
Create an account or sign in to comment You need to be a member in order to leave a comment Create an account Sign up for a new account in our community. By stanyJune 3, in Power Electronics. PDF This gives you the basic idea, but there are other problem issues not mentioned here.
2N4444 – SCR, V(DRM) = 600V TO 699.9V
We can see that D1 with the lowest leakage will have more than its rated V over it. We want to use it in a V application. Already have an account?
Hey guys, I’m a new member to this forum, so I have no idea if this topic has arisen before. Register dataxheet new account. I have a project coming up where I need to hold off about volts using an SCR. Share this post Link to post Share on other sites. Posted June 3, Power Electronics Search In. 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.