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Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
I am developing ( well, copying) DRSSTC controller based on U2.5.
I have some questions: CT transformer don't have any real loading on frequency feedback, only 50R resistor+inductor. if i have 1:300 transformer, that will mean very high voltage on input node. Also inductors use very thin windings. Is it good idea to keep that way, if bridge can push 2-3kA? (CM600 Full bridge)
Also i will add interrupter monitoring, so even if i have 1 at input, it will shut down my driver before IGBT will be killed.
Registered Member #46012
Joined: Thu May 01 2014, 12:54AM
Location:
Posts: 20
Hi! I finished build this board two days ago. Any idea how to start use it. I feel lack of documentations for people like me (I spent only day to build it but it's my first experience wirh DRSSTC and with UD 2.x drivers). I have 2ch oscilloscope, multimeter and regulated power adapter 5-35V and fixed voltage 60+120 V (500W) power supply. Also I have gate from this schema DRSSTC3.
Can you kindly assist me to start as safe as possible (don't damage components of UD 2.5) and give advice (or maybe there's a checklist) how to check that UD 2.5 assembled fine?
Registered Member #6038
Joined: Mon Aug 06 2012, 11:31AM
Location: Salado, TX
Posts: 248
I am testing a UD2.5A board that I just completed. voltage rails all looked good. I have D13 removed as I am not using the IF receiver. Added in the R21 resistor and now the OCD LED comes on. Before adding R21 it did not. Looking at the circuit, I don't see why it would come on without any OCD current. Anyone else seen this?
It's normal for the OCD light to turn on during startup (is this what you meant?) This is just the behavior of the 74HC74 flipflop starting in that state. I actually use it as a good indicator if my interrupter line is working by sending a pulse which should clear it when triggered.
Registered Member #46012
Joined: Thu May 01 2014, 12:54AM
Location:
Posts: 20
Hi! Third time burned FDD8424H (U3 on the board).
So what I do: I power the driver from DC-source - 6S LiPo battery (25.2V but 24 with load). I removed B1 rectifier (to prevent 0.7 voltage drop on it).
When I power on the driver from 12V - it works as expected. But 24V power source burns U3 each time when I try to power it on. I tested with GDT connected and disconnected - usually the same result. (but there's no shorts on the board, I checked at least 5 times).
I'm not sure about U1 and U2, because they are not installed. But U4 doesn't burn!! I checked FDD8424H datasheet - it can work up to 40V.
Please give me an advice how to solve the problem?
Registered Member #11591
Joined: Wed Mar 20 2013, 08:20PM
Location: UK
Posts: 556
Vitalii wrote ...
Hi! Third time burned FDD8424H (U3 on the board).
So what I do: I power the driver from DC-source - 6S LiPo battery (25.2V but 24 with load). I removed B1 rectifier (to prevent 0.7 voltage drop on it).
When I power on the driver from 12V - it works as expected. But 24V power source burns U3 each time when I try to power it on. I tested with GDT connected and disconnected - usually the same result. (but there's no shorts on the board, I checked at least 5 times).
I'm not sure about U1 and U2, because they are not installed. But U4 doesn't burn!! I checked FDD8424H datasheet - it can work up to 40V.
Please give me an advice how to solve the problem?
sorry, I haven't looked at the schematics, but couldn't it be some inductive element causing high(er) voltage back EMF?
Registered Member #46012
Joined: Thu May 01 2014, 12:54AM
Location:
Posts: 20
ok. I found a real cause of this stupid issue. It's a problem with board tracing. I'm not sure where's the mistake but it can be in Gerber-files. In other case it's a mistake that happened on board printing machine.
2 lanes on the board that connect U1 and U3 sources to R12 and R22 were not connected. As a result one of gates had 22V.
Signal on U1 Gate1: Signal on U1 Gate2: Error on the board (marked pink):
I add all this data to tread because somebody may have similar behavior - Driver works fine on 12 V but burns on 24V.
Now it works fine from 25V source without B1 rectifier!
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Universal DRSSTC Driver V2.5 (Sold Out)
