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Old 24th January 2010, 04:54 PM   #1
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Default new smps 800watt

+- 70 dc smps ultra power good my design
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Old 24th January 2010, 08:45 PM   #2
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Is that a CAR AMP power supply?

However, it looks ok, but 220VAC designs are most required.
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Old 27th January 2010, 09:03 AM   #3
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220 coming soon
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Old 27th January 2010, 05:17 PM   #4
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Those ancient IRFP064 waste a lot of space and don't perform that good. Newer TO-220 MOSFET will use less space and provide lower Rds-on. See IRF3205 or IRF2907Z for example.

A standard recovery diode bridge won't be up to the job either, too much reverse recovery charge is stored in that kind of diodes.

The push-pull layout is not good, current sharing between the triplets of MOSFET is not going to be good, and balancing between both banks isn't going to be good either, parasitic PCB resistances and inductances from each MOSFET to the transformer are quite different.

Input EMI filtering is missing, and the placement of the 6800uF 16V capacitor is far from optimum too.

Consider redoing the layout with double sided PCB and ground plane.
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Last edited by Eva; 27th January 2010 at 05:20 PM.
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Old 27th January 2010, 08:05 PM   #5
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Why the insanely long gate traces? Why 100 ohm resistors? That thing will take microseconds to switch!

The output is capacitor-input filtered which will destroy your MOSFETs anyway... no worries about slow switching, they'll switch once and that's that.

Tim
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Old 28th January 2010, 09:10 AM   #6
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We do not understand electronics designed it this way and that way it works perfectly SMPS you how much of your electronic information is weak and I'm sorry that I have seen comments from
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Old 28th January 2010, 01:08 PM   #7
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If you say that it works perfectly...

How did you manage to get the CE approval?

To Tim: There is nothing wrong with having capacitors just after the diodes at the output, it just requires soft start, then transformer leakage inductance and capacitor ESR shape the current pulses nicely, and believe it or not, maximum current happens only at the end of the pulses, they are inverse-exponential (log) shaped, like in a LR lowpass filter.
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Old 28th January 2010, 01:25 PM   #8
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I'm using this circuit for a year I got the 900 watt power this circuit is running smoothly and without interference or who believe if you do not believe the good times do I send the pcb diagram
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Old 29th January 2010, 12:45 AM   #9
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Quote:
Originally Posted by Eva View Post
If you say that it works perfectly...

How did you manage to get the CE approval?

To Tim: There is nothing wrong with having capacitors just after the diodes at the output, it just requires soft start, then transformer leakage inductance and capacitor ESR shape the current pulses nicely, and believe it or not, maximum current happens only at the end of the pulses, they are inverse-exponential (log) shaped, like in a LR lowpass filter.
What happens if input voltage rises by 10%?

Oops...
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Old 30th January 2010, 09:17 PM   #10
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not an issue then dangerous and should not exceed max 13 volt
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