Greetings everybody,
i'm running the 500w (real 300w) IRS2092S from two individual 1200w 20a step up converters (ali express link) wich are connected to two individual 12v batterys.
Works great, i didn't noticed anny issues on the first try outdoor playing a reasonable time on full power too.
But back home i'm noticing a "plop" sound and power cutoff when i turn it up around half way. I gave the channel a bit more power from the omnitronic smard-24rca to be able to give it the max 1,5v output voltage, so it might be that the "ploping" wasn't an issue on my first trys because it was still not playing on full power even if turned up fully because the channel of the omnitronic device was just on half power or something. With my NX3000 Amp the box is still doing fine, so there is nothing broken there 😉
I assume the "plop" is caused because of a power breakdown of the step up converters. (I tested using bigger batterys and a lipo at one side, so i don't think the issue is caused by the batterys not giving enough to the step ups).
I thought some capacitors could buffer the power supply for big drains? I'm running the box 30-70hz with heavy dub music, so more sub bass than kick - could capacitors help in this case too?
Secondly i'm not sure if capacitors will work, because a friend told me they block DC. After some web-search i could only find thins like this (ali express link) but they are for AC to DC - so i assume they don't work with dc input?
On the other hand i found a forum post where somebody just used one small capacitor in between the step up and the amp (50w) and it worked great for him. So the DC isn't an issue? If not, i'm asking myself where i need to place them: Cause the Amp is +/-65v i assume i would need to place them on the + and the - way but not on the gnd path?
And fourth: How many would i need? I calculeted that 3amps on 65v (each side) for one second (possible bass puls) would need about 50.000 uF, and i read that small capacitors in paralell have less resistance (and are cheaper😉 than a few big ones - so i would install like 100 470uf capacitors on the + and negative side?! Or will 10 on each side improve my situation well enough (since that would already be a big improvement/addition compared to the few caps on amp and step up).
Hope somebody can give me some advices,
thanks for reeding,
HimG
i'm running the 500w (real 300w) IRS2092S from two individual 1200w 20a step up converters (ali express link) wich are connected to two individual 12v batterys.
Works great, i didn't noticed anny issues on the first try outdoor playing a reasonable time on full power too.
But back home i'm noticing a "plop" sound and power cutoff when i turn it up around half way. I gave the channel a bit more power from the omnitronic smard-24rca to be able to give it the max 1,5v output voltage, so it might be that the "ploping" wasn't an issue on my first trys because it was still not playing on full power even if turned up fully because the channel of the omnitronic device was just on half power or something. With my NX3000 Amp the box is still doing fine, so there is nothing broken there 😉
I assume the "plop" is caused because of a power breakdown of the step up converters. (I tested using bigger batterys and a lipo at one side, so i don't think the issue is caused by the batterys not giving enough to the step ups).
I thought some capacitors could buffer the power supply for big drains? I'm running the box 30-70hz with heavy dub music, so more sub bass than kick - could capacitors help in this case too?
Secondly i'm not sure if capacitors will work, because a friend told me they block DC. After some web-search i could only find thins like this (ali express link) but they are for AC to DC - so i assume they don't work with dc input?
On the other hand i found a forum post where somebody just used one small capacitor in between the step up and the amp (50w) and it worked great for him. So the DC isn't an issue? If not, i'm asking myself where i need to place them: Cause the Amp is +/-65v i assume i would need to place them on the + and the - way but not on the gnd path?
And fourth: How many would i need? I calculeted that 3amps on 65v (each side) for one second (possible bass puls) would need about 50.000 uF, and i read that small capacitors in paralell have less resistance (and are cheaper😉 than a few big ones - so i would install like 100 470uf capacitors on the + and negative side?! Or will 10 on each side improve my situation well enough (since that would already be a big improvement/addition compared to the few caps on amp and step up).
Hope somebody can give me some advices,
thanks for reeding,
HimG
You may find too much capacitance inhibits the supplies from starting up, you need a good datasheet to tell you about such things, and I don't think you'll find one for an Ali Express supply. Very large caps can look like a dead-short to the protection circuitry.
I'd go for supplies that can handle the current with ease, not a patch-up solution.
Filter caps go from each supply rail to ground, and are normally only needed in linear supplies to make up for the mains voltage dropping during zero-crossing, switch-mode supplies already have this built in.
Do you have any way to test the supplies with a dummy load - are you sure they can handle 20A - especially a bursty 20A load? Plenty of pretty rubbish cheap stuff out there that doesn't live up to its description...
I'd go for supplies that can handle the current with ease, not a patch-up solution.
Filter caps go from each supply rail to ground, and are normally only needed in linear supplies to make up for the mains voltage dropping during zero-crossing, switch-mode supplies already have this built in.
Do you have any way to test the supplies with a dummy load - are you sure they can handle 20A - especially a bursty 20A load? Plenty of pretty rubbish cheap stuff out there that doesn't live up to its description...
Greetings Mark,
there a serveral datasheets for the chip (https://www.infineon.com/dgdl/an-1138.pdf?fileId=5546d462533600a40153559a077610d1 and https://www.infineon.com/dgdl/irs2092.pdf?fileId=5546d462533600a401535675f1be2790) or do you wanted to know more infos about the caps / transistors and stuff they use on the board?
For the Converters there are tests where people getting constant 30a from it look at this (at minute 18 he uses the voltage i'm using as well)
Review of 1200W 20A DC Input 8V-60V Output 12V - 80V Boost converter - Robojax - YouTube - but you are right, that's not burst load. Thats why i wanted to add the caps. But still i guess two of them that can handle 30a should be enough for the 300w the amp needs, or am i wrong? The thing is, that bigger converters get quite expensive because they are not sold so often. So in case bigger power converters are the best option i would go for this solution to use two of them on each way: RF Man discusses load sharing in parallel power supply's and boost converters - YouTube
But if i get you right, the only problem could be the short crucit protection of the amps on start up - in my post i was worryed about that caps don't work for my dc propose, but that dosn't seems to be a problem here? Then i might just order 20 caps (10 for each way) and test if it makes a small difference compared to an other amp without this adjustment i guess?
there a serveral datasheets for the chip (https://www.infineon.com/dgdl/an-1138.pdf?fileId=5546d462533600a40153559a077610d1 and https://www.infineon.com/dgdl/irs2092.pdf?fileId=5546d462533600a401535675f1be2790) or do you wanted to know more infos about the caps / transistors and stuff they use on the board?
For the Converters there are tests where people getting constant 30a from it look at this (at minute 18 he uses the voltage i'm using as well)
Review of 1200W 20A DC Input 8V-60V Output 12V - 80V Boost converter - Robojax - YouTube - but you are right, that's not burst load. Thats why i wanted to add the caps. But still i guess two of them that can handle 30a should be enough for the 300w the amp needs, or am i wrong? The thing is, that bigger converters get quite expensive because they are not sold so often. So in case bigger power converters are the best option i would go for this solution to use two of them on each way: RF Man discusses load sharing in parallel power supply's and boost converters - YouTube
But if i get you right, the only problem could be the short crucit protection of the amps on start up - in my post i was worryed about that caps don't work for my dc propose, but that dosn't seems to be a problem here? Then i might just order 20 caps (10 for each way) and test if it makes a small difference compared to an other amp without this adjustment i guess?