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Old 4th January 2013, 02:34 AM   #3141
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Default LOAD TESTING

SOME TESTING PICS on 1500watt load
warm regards
andrew lebon
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Old 4th January 2013, 03:41 AM   #3142
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Quote:
Originally Posted by Hadighorbani View Post
i dont like jumpers
I think this is beter

Click the image to open in full size.
Jumpers are ok.
Why your suggestion is not good? Let's compare it.

1st jumper: is there so that the Logic Gnd (VSS) of CD4049 and Logic Gnd of IR2110 are referenced on the same point.

2nd jumper: the feedback is routed inside the IC instead of routing it along the "noisy" high side gate drive.

3rd jumper: minimizes the path/trace for the current loop in the low side gate drive.

Regards,
Lester
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Last edited by jlester87; 4th January 2013 at 03:54 AM.
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Old 4th January 2013, 04:13 AM   #3143
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Quote:
Originally Posted by Hadighorbani View Post
HI
thanks for your sharing
why you and other engineer dont creat all things in one board ?
main board dont have OCP ?
for OCP i must creat protection board too ?
thanks
Yes you must create speaker protect with external trigger for it to work.

But I am doubting if the relay is fast enough for it to turn off before the mosfets blow.

I am thinking if this will work?
I will connect the trigger to the SD pin of IR2110, current and voltage will be limited by resistor and zener diode.

Any Ideas?
Thanks
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Old 4th January 2013, 06:08 AM   #3144
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Oh, I realized that the SD pin should be connected to logic ground in normal operation, so the circuit above might not work.

I'll revise it

Last edited by jlester87; 4th January 2013 at 06:13 AM.
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Old 4th January 2013, 07:32 AM   #3145
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sir CPX say to me before the relay is not fast enofe.
i belive him
it is beter to you sir to creat every thing in one board and without relay
you is beter than me
thanks
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Old 4th January 2013, 07:35 AM   #3146
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Default thanks dear friend

Quote:
Originally Posted by CPX View Post
Hadighorbani:
Use multisim 11 to open that file. Also you have a huge ground loop on that board and no snubers....
Hi sir CPX
how are you today friend ?
i am happy to see you again here.
thanks for your helping
have nice day
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Old 4th January 2013, 08:20 AM   #3147
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I think it will be fast if the relay is a solid state/mosfet based.

I think I'll just add a daughter board that can be easily attached through pins.

Last edited by jlester87; 4th January 2013 at 08:38 AM.
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Old 4th January 2013, 08:30 AM   #3148
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Quote:
Originally Posted by jlester87 View Post
I think it will be fast if the relay is mosfet based.
so expensive
and mosfet have enoufe power ?
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Old 4th January 2013, 10:44 AM   #3149
manojtm is offline manojtm  India
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Quote:
I think it will be fast if the relay is a solid state/mosfet based.
Hi Jlester87,

For DC protect we need 10ms fast is enough if your circuit detect <or=3v dc what i used is <10ms fast one and all other higher current(>10A) rated relays are 18ms fast.

for protecting MOSFET need OC circuit and use at least twice the current rated (25degree) FET.

Regards
MANOJ
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Old 4th January 2013, 11:12 AM   #3150
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Hi Manoj,

Thanks for the info.

I have a Songchuan 801H-1C-S here, it has a 5ms release time. I'll check the SOA of IRFB4227 in its datasheet if it can survive 40A Current within 20ms(worst case).

Iraudamp1 also uses a mechanical relay for OCP, it has a 5ms release time according to its datasheet but it has no documentation for the response of OCP. (unlike IRAUDAMP9 and modified IRAUDAMP5 reference designs)

Regards,
Lester

Last edited by jlester87; 4th January 2013 at 11:32 AM.
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