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Registered Member #75
Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
Nick, I think your gate drive transformer is no good. You should wind it with a single multifilar winding of all the turns twisted together instead of multiple windings, that give a much lower leakage inductance.
Registered Member #19
Joined: Thu Feb 02 2006, 03:19PM
Location: Jacksonville, FL
Posts: 168
Thanks for all the suggestions. I have gotten the ucc chips except I accidentally ordered SOIC chip size. I needed a really fine point on my soldering iron to solder these so I attached some small steel wire to the tip.
The chip when it was done^
wave from gdt^(no dc blocking cap yet)
I plugged the timer into it and set my probe to 10x. I got a nice square wave so I then hooked up to the gdt. I had to set the probe back to 1x and the voltage looks like 3 volts . Right now I am using an 8 turn primary and 16 turn secondary’s. I will try to wrap another gdt with multifilar wire and add a dc blocking cap tonight.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
If you plan on operating your DRSSTC at relatively high duty cycles (say >5%), then you will likely need to heatsink those SOIC packages or provide a heatpath for them as they are considerably smaller than the DIP packages which tend to dissipate heat more easily.
To check this, you don't even have to power your bridge up. Just connect everything (bridge, IGBTs, etc...) to your gate driver circuitry, and run it starting at very low duty cycle. Check temp of the driver chips and slowly increase to your maximum duty, checking for heating.
Registered Member #139
Joined: Sat Feb 11 2006, 11:01AM
Location: Perth, Western Australia
Posts: 358
I've noticed that running a 1:2:2 GDT and IGBT's draw a LOT more than a 1:1:1 and MOSFETs. I've had to heatsink my UCC's, and change the blocking cap. Also, don't forget the tantalums over the UCC's either, that should help things along too.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Desmogod wrote ...
I've noticed that running a 1:2:2 GDT and IGBT's draw a LOT more than a 1:1:1 and MOSFETs. I've had to heatsink my UCC's, and change the blocking cap. Also, don't forget the tantalums over the UCC's either, that should help things along too.
First, you can't compare heat draw when comparing two different devices. Heat dissipation will be dependent upon individual device characteristics and operating parameters.
However, if you had the same device, heat dissipation would increase with a 1:2:2 vs. a 1:1:1 since dissipation is a function of the square of the voltage driving the gate, so for same operating parameters.
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gdt problems and suggestions for drsstc driver?
. Right now I am using an 8 turn primary and 16 turn secondary’s. I will try to wrap another gdt with multifilar wire and add a dc blocking cap tonight.