if you have 2x500W amplifier, then a 600W SMPS will do the Job.
1200W SMPS will run 1800W amplifier
1kW smps project (based on MicrosiM design)
- Thread starter ludo3232
- Start date
if you have 2x500W amplifier, then a 600W SMPS will do the Job.
1200W SMPS will run 1800W amplifier
badboy_6120
Member
Can I use "IRGP4066" to get at least 1200w for long time?
badboy_6120
Member
Thank you microsim
but I really like to build a real 1000 or even better 1200w smps that can handle this much power for at least 1 hour ( of course with large heatsink and large fan)
I just want a replacement for IRFP460 that does not melt down internally at 1200w power for long time
You said that I have to change my mosfets to IGBTs
Whitch one of these can handle 1200w power easily and I can replace IRFP460 with it?
1- FGL60N100
2- K75T60
3- IRGP4066
4- FGL40N120
5- FGH40n60
Thank you
badboy_6120
Member
Hi guys
I decided to darallel two IRFP460 togather to handle 1200w output
How about it?
This is the better choice or using a IGBT?
I decided to darallel two IRFP460 togather to handle 1200w output
How about it?
This is the better choice or using a IGBT?
badboy_6120
Member
I change the mosfets with IGBTs and test the circuit in 1037W (6.1A @ 170V) output power for more than 20 minutes
IGBTs case temperatures : Q1=74°C & Q2=84°C
Output diodes case temperatures : 70°C
Transformer winding Temp: 100°C
Transformer Cores temperatures : 80°C
Input bridge = 65°C
**I stop the test in 20 min because of the temperature of transformer winding**
Why the difference between Q1 and Q2 temp?
I also loaded the smps with 750W (4.2A @ 178V) power for more than 1 hour
IGBTs case temperatures : Q1=64°C & Q2=72°C
Output diodes case temperatures : 59°C
Transformer winding Temp: 72°C
Transformer Cores temperatures : 60°C
Input bridge = 58°C
IGBTs case temperatures : Q1=74°C & Q2=84°C
Output diodes case temperatures : 70°C
Transformer winding Temp: 100°C
Transformer Cores temperatures : 80°C
Input bridge = 65°C
**I stop the test in 20 min because of the temperature of transformer winding**
Why the difference between Q1 and Q2 temp?
I also loaded the smps with 750W (4.2A @ 178V) power for more than 1 hour
IGBTs case temperatures : Q1=64°C & Q2=72°C
Output diodes case temperatures : 59°C
Transformer winding Temp: 72°C
Transformer Cores temperatures : 60°C
Input bridge = 58°C
badboy_6120
Member
badboy_6120
Member
are other temperatures for 1037w normal???
because ludo3232 (starter of this thread) claim this:
I don't know if he measured the temperature of IGBT's body or the heatsink of them to get 52°c???!!!!
or something is wrong with mine????
because ludo3232 (starter of this thread) claim this:
I don't know if he measured the temperature of IGBT's body or the heatsink of them to get 52°c???!!!!
or something is wrong with mine????
Jagd.Panther
New member
I hope it was Tc. Badboy, what IGBT's did you end up with? And at what frequency does your SMPS operate?
badboy_6120
Member
Hello Jagd.Panther
in above measurements the smps frequency was on ~70Khz
but now I lower the frequency to 50Khz and now the IGBTs temperatures won't go higher than 60°c loaded with ~1400W for 10 minutes (I have to stop the test because of winding temperature)
My IGBTs are FGL40N120AND
badboy_6120
Member
I red somewhere that the safe frequency for 0.25mm wire(copper) is above 100Khz
I think my winding thickness is not enough???
Primary >> 22x0.25mm
secondary >> 32x0.25mm
The left one is Secondary homemade litz: outer diameter is about 2 mm
The right one is Primary homemade litz: outer diameter is about 1.5 mm
badboy_6120
Member
badboy_6120
Member
ETD49
Currently my output voltage is about +-100V that I have to lower it down to +-80V for my use
In +-80 volts each rail has to deliver at least 8A rms
Frequency is 50khz at the moment
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badboy_6120
Member
The program is on the forum.View attachment ??????.rar
http://www.diysmps.com/forums/showthread.php?522-Calculation-programs-for-transformers-and-inductors
http://www.diysmps.com/forums/showthread.php?522-Calculation-programs-for-transformers-and-inductors
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badboy_6120
Member
Before I winded the transformer I check this program but its results seems weird
Is primary wire thicker than secondary?(See below snapshot)
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