Eva said:
It's like MMIC design - the layout IS the design. I see a bunch of perf board and I doubt that will go over very big when it's scaled up to full power. You can build a 50 watt class D amp out of just about anything. Add zeroes and the fun starts - things that didn't matter suddenly do.
Uffffffff
Uffffff, as I can see, EVERYBODY, tells me ONLY about PCB design,and feedback.
I HAVE UNDERSTAND IT, I will go to a PROFESSIONAL COMPANY to design,project and realise that PCB for me, course I will pay for that, because I'm not intending to do myself PCB.
But to go there, I must go with the final schematic....
The only thing (help) that I asked here is an OPINION, maybe a small draving,ABOUT how to REPLACE all PMos transistors with N-Mos ones.
I know I cannot modify thet part of schematic,and I need an advice how to do to use Nmos for all output stage.
I know and I have some designs with IR2110 driving NMos, but is NOT IN FULLBRIDGE MODE, that I intend to keep here.
Looks like we spoken different languages, because I asked for something , and I always receive opinions about PCB designing anf feedback...
I will put again what I need...
Uffffff, as I can see, EVERYBODY, tells me ONLY about PCB design,and feedback.
I HAVE UNDERSTAND IT, I will go to a PROFESSIONAL COMPANY to design,project and realise that PCB for me, course I will pay for that, because I'm not intending to do myself PCB.
But to go there, I must go with the final schematic....
The only thing (help) that I asked here is an OPINION, maybe a small draving,ABOUT how to REPLACE all PMos transistors with N-Mos ones.
I know I cannot modify thet part of schematic,and I need an advice how to do to use Nmos for all output stage.
I know and I have some designs with IR2110 driving NMos, but is NOT IN FULLBRIDGE MODE, that I intend to keep here.
Looks like we spoken different languages, because I asked for something , and I always receive opinions about PCB designing anf feedback...
I will put again what I need...
I can also tell you PCB will be hardest, it can kill project if not tone good
About IR, you must basicly use 2 half bridges and put them together. Use RCD with inverters for easy dead time adj. Thats about it
About IR, you must basicly use 2 half bridges and put them together. Use RCD with inverters for easy dead time adj. Thats about it
luka said:
That's what I need to be helped....
An externally hosted image should be here but it was not working when we last tested it.
For dead time circuit, check my amp on this forum or my site
I used inverter > resistor + diod > C
Resistor was trimer, so I could set dead time
What I would do now is after C use another buffer, so that IR would get only squere wave. Also about R and C values you can read HERE and HERE
About how too put them together, I think it is wery much like bridging 2 amp, 2 half bridges, but only here you can use only one input circuit/modulator... also output filter in a bit diffrent, 2 LC filters(2 amps) but with addition of another bank of capacitors across load I think
In the end it doesn't matter if you are building full or half bridge amp, P mos can and will be replaced with N with use of IR..
I don't know... about if you will be able to make it work as it should, since I think this is your first amp... and full bridge is essentially two half bdrige amps, and even one can be hard to make, trust me, you can't just throw elements up...it will work, but not for long or with much problems
I used inverter > resistor + diod > C
Resistor was trimer, so I could set dead time
What I would do now is after C use another buffer, so that IR would get only squere wave. Also about R and C values you can read HERE and HERE
About how too put them together, I think it is wery much like bridging 2 amp, 2 half bridges, but only here you can use only one input circuit/modulator... also output filter in a bit diffrent, 2 LC filters(2 amps) but with addition of another bank of capacitors across load I think
In the end it doesn't matter if you are building full or half bridge amp, P mos can and will be replaced with N with use of IR..
I don't know... about if you will be able to make it work as it should, since I think this is your first amp... and full bridge is essentially two half bdrige amps, and even one can be hard to make, trust me, you can't just throw elements up...it will work, but not for long or with much problems
Something
Something like that, is OK?
Common ground will be the same for all stages.
Oscillator,input,feedback,comparator (LM361) will be supplied from SEPARATE +/- 12Vcc,referenced to Common GND, and IR2110 will receive their +15Vcc and +5Vcc,also from another separate +15 and +5Vcc,referenced to Common GND.
The +5Vcc will be obtained with an 7805 from +15Vcc of IR2110 supply.
That means, power supply will have one +/- 12Vcc outputs respect to GND .
Another +15Vcc output respect to GND,from where I will derive+5Vcc.
The power part of +120,,,160Vcc, +Vcc and Common GND
+/-12Vcc out GND will have common with Common GND, also +15Vcc GND will meet Common GND in same point.
That means I will have +/- 12Vcc,+15Vcc,+5Vcc, all galvanic isolates but with their GND connected to Common GND.
Here is the ideea:
Any other comments or suggestion are welcomed!
Something like that, is OK?
Common ground will be the same for all stages.
Oscillator,input,feedback,comparator (LM361) will be supplied from SEPARATE +/- 12Vcc,referenced to Common GND, and IR2110 will receive their +15Vcc and +5Vcc,also from another separate +15 and +5Vcc,referenced to Common GND.
The +5Vcc will be obtained with an 7805 from +15Vcc of IR2110 supply.
That means, power supply will have one +/- 12Vcc outputs respect to GND .
Another +15Vcc output respect to GND,from where I will derive+5Vcc.
The power part of +120,,,160Vcc, +Vcc and Common GND
+/-12Vcc out GND will have common with Common GND, also +15Vcc GND will meet Common GND in same point.
That means I will have +/- 12Vcc,+15Vcc,+5Vcc, all galvanic isolates but with their GND connected to Common GND.
Here is the ideea:
An externally hosted image should be here but it was not working when we last tested it.
Any other comments or suggestion are welcomed!
Do you really want to have dc component at output? If its ok for you, this arrangement should work (i know Powersoft have something like this; pm for the sch)
I think you could use only 15v for IR, no need for 5v
Dead time circuit is ok, but remove 47R, you need fastest turn off as possible
R should be as small as possible and C as big as possible, not saying this is wrong, but just to say this is due to noise pick up to be lower
Aslo no need for 18V zeners, since you will have 15v regulated I assume
Dead time circuit is ok, but remove 47R, you need fastest turn off as possible
R should be as small as possible and C as big as possible, not saying this is wrong, but just to say this is due to noise pick up to be lower
Aslo no need for 18V zeners, since you will have 15v regulated I assume
Yes
Yes, it's working perfectly!
Small modifications of tensions on pins 10 and 14 of LM 361.
On those small heatsinks, taken from an faulty PC power supply (very small) temperature not exceed 45-47 celsius degrees, after 40 minutes of benching on 4 ohms 300W speaker,supplied at 55Vdc,achieving on speaker 37-39VRMS till clipping.
In idle they rest 2-3 degrees more than room temperature.
In idle I have 13 miliamperses consumed by IRF540, the output residual of 125 Khz, measured on bridged output decreased from 138milivolts to 33 milivolts, and DC offset is under 10 milivolts!
The coils are cold cold cold!😎
I'm very very satisfied about it, and next weel I will try with 2 IRFP260N in parallel for each mosfet , and I will grow powersupply to 100-125-150Vcc.
After that, I will give a try with optos and TC4xxx mosfet drivers.
Those are the dimensions of heatsink that I used, and they are in centimeters.
Opinions?
I'm estimating it's randament is around 94%
Yes, it's working perfectly!
Small modifications of tensions on pins 10 and 14 of LM 361.
On those small heatsinks, taken from an faulty PC power supply (very small) temperature not exceed 45-47 celsius degrees, after 40 minutes of benching on 4 ohms 300W speaker,supplied at 55Vdc,achieving on speaker 37-39VRMS till clipping.
In idle they rest 2-3 degrees more than room temperature.
In idle I have 13 miliamperses consumed by IRF540, the output residual of 125 Khz, measured on bridged output decreased from 138milivolts to 33 milivolts, and DC offset is under 10 milivolts!
The coils are cold cold cold!😎
I'm very very satisfied about it, and next weel I will try with 2 IRFP260N in parallel for each mosfet , and I will grow powersupply to 100-125-150Vcc.
After that, I will give a try with optos and TC4xxx mosfet drivers.
Those are the dimensions of heatsink that I used, and they are in centimeters.
Opinions?
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
I'm estimating it's randament is around 94%
What
What someone could say about those Mos-Fets?
Running at 125 Khz, no more, no less.
Supplied at max 170Vcc,equivalent of +/- 85Vdc
Evident in full bridge mode.
http://ixdev.ixys.com/DataSheet/99118.pdf
or
http://www.farnell.com/datasheets/307949.pdf
or this one looking to be the best,excluding capacitance:
http://www.irf.com/product-info/datasheets/data/irfp4668pbf.pdf
or that:
http://ixdev.ixys.com/DataSheet/99297.pdf
or:
http://www.irf.com/product-info/datasheets/data/IRFB4110PBF.pdf
I'm waiting for your fair opinions, regarding advantages and disadvantages of each one.
What someone could say about those Mos-Fets?
Running at 125 Khz, no more, no less.
Supplied at max 170Vcc,equivalent of +/- 85Vdc
Evident in full bridge mode.
http://ixdev.ixys.com/DataSheet/99118.pdf
or
http://www.farnell.com/datasheets/307949.pdf
or this one looking to be the best,excluding capacitance:
http://www.irf.com/product-info/datasheets/data/irfp4668pbf.pdf
or that:
http://ixdev.ixys.com/DataSheet/99297.pdf
or:
http://www.irf.com/product-info/datasheets/data/IRFB4110PBF.pdf
I'm waiting for your fair opinions, regarding advantages and disadvantages of each one.
first is bad, 3uC...
2nd is only 40v..
3rd input capacitance way too big
4rd only 150v, 2.3uC,...
5th is 100v only...
try irfp4227
and your supply should be 85v not 170, since you are runing full bridge
2nd is only 40v..
3rd input capacitance way too big
4rd only 150v, 2.3uC,...
5th is 100v only...
try irfp4227
and your supply should be 85v not 170, since you are runing full bridge
DjLeco!
If you want to use it on 170 V, then how could you choose IRFB4110, IXTK180N15P, IRL1004?
IXTQ100N25P is more-or-less usable, but it's diode is quite slow (causing a lot of switching loss and EMI), and I bet it's very expensive.
IRFP4668 is good, if you watch it by itself, but you can run into some problems if you drive it with IR2110. With optocoupled driver it can be good.
In one of the nearby topics, you can find some preferred devices.
If you want to use it on 170 V, then how could you choose IRFB4110, IXTK180N15P, IRL1004?
IXTQ100N25P is more-or-less usable, but it's diode is quite slow (causing a lot of switching loss and EMI), and I bet it's very expensive.
IRFP4668 is good, if you watch it by itself, but you can run into some problems if you drive it with IR2110. With optocoupled driver it can be good.
In one of the nearby topics, you can find some preferred devices.
luka said:
I wil suppli'em with 125 between 150, even 180Vcc in fullbridge mode.
I want to have more than 1500W/8 ohm 2000+ on 4 ohm, parraleling 2 mosfets trying into 2 ohms load...
And the mosfet winner is?
For 160Vcc singlerail supply in fullbridge mode, drived by IR2110, or even with TC44xx buffer?
For me seems to be IRFP4668, his 10700pF capacitance is rated at 1Mhz, I will run it at 125 Khz wich is 0,125Mhz.
Any other recomandations, the ones that you have used?
Pafi said:
Sorry with that IRL, it will be intended for car SMPS from 12Volts
[/QUOTE]First
First I will give a try with IRFP260N drived by IR2110, at 100Vcc.
Is ok to use ES1D (15nsec/200Volts/1A) diodes,between D-S pins for fast recovery?
http://www.fairchildsemi.com/ds/ES/ES1B.pdf
Also I have alot of MURA160T3 fast diodes too.
Is enough at 1A, or I must use bigeer amperage type?
Wich are the difference between Microchip drivers TC4421 and 4422, one is inverting and other is non inverting?
http://ww1.microchip.com/downloads/en/DeviceDoc/21420d.pdf
Could be used as mosfet drivers,drived by 6N137 optos?
By example TC4422 Low side ant TC4421 High side?
Or how else?
I have 20 from each TC's and I want to use them.
Also I have alot ot TC4426, dual mosfet driver.
Are usefull too?
http://www.datasheetcatalog.org/datasheet/microchip/21422b.pdf
And also alot of MC34151 (originals that was used in Crown BCA series amplifier, but seems to be inverting ones..
http://www.datasheetcatalog.org/datasheet/on_semiconductor/MC34151-D.PDF
Waiting for some advices, pease!
First I will give a try with IRFP260N drived by IR2110, at 100Vcc.
Is ok to use ES1D (15nsec/200Volts/1A) diodes,between D-S pins for fast recovery?
http://www.fairchildsemi.com/ds/ES/ES1B.pdf
Also I have alot of MURA160T3 fast diodes too.
Is enough at 1A, or I must use bigeer amperage type?
Wich are the difference between Microchip drivers TC4421 and 4422, one is inverting and other is non inverting?
http://ww1.microchip.com/downloads/en/DeviceDoc/21420d.pdf
Could be used as mosfet drivers,drived by 6N137 optos?
By example TC4422 Low side ant TC4421 High side?
Or how else?
I have 20 from each TC's and I want to use them.
Also I have alot ot TC4426, dual mosfet driver.
Are usefull too?
http://www.datasheetcatalog.org/datasheet/microchip/21422b.pdf
And also alot of MC34151 (originals that was used in Crown BCA series amplifier, but seems to be inverting ones..
http://www.datasheetcatalog.org/datasheet/on_semiconductor/MC34151-D.PDF
Waiting for some advices, pease!
An externally hosted image should be here but it was not working when we last tested it.
Also
Also, excuse me, I forgot...
Any formula for calculating Snubbers for MosFets, ans Output coil inductance?
Also, excuse me, I forgot...
Any formula for calculating Snubbers for MosFets, ans Output coil inductance?
It's useless. Any kind of FRED is useless too, it won't conduct significant current, bacause all of them have higher voltage drop then the body diode.
IRFP4227 is much better then IRFP260N in every aspect.
Ok
Ok,I will buy some 4227's , thank's for advice, but no one told me a formula to calculate Snubber's value (resistor+capacitor) wich will be on D-S pins of mosfets, and a formula to calculate output coil and outpul capacitor.
Please need some assistance solving that problem!
Ok,I will buy some 4227's , thank's for advice, but no one told me a formula to calculate Snubber's value (resistor+capacitor) wich will be on D-S pins of mosfets, and a formula to calculate output coil and outpul capacitor.
Please need some assistance solving that problem!
It depends on the parasitic elements, PCB layout, and have to be determined by experimentation.
It depends on the requirements and the reachable parts and materials, but it can't be transformed into a simple formula. Since you haven't specified any requirements related to output filter, and we don't know your sources, we can't help you.
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