Hi guys i am hoping someone can help me, I have asked the same question on the power supply design forum. I need a regulated 14Vdc power supply @ 150+amps and was wandering if i could modify the circuit from Mr Nelson Pass.
I was thinking of just paralelling heaps of mosfets and disregard the bottom half of the circuit as i only need +14V. I will also have to change the value of the zeners i take it.Not sure exactly what values to use. Please help me if you can.
Regards
Bowdown
I was thinking of just paralelling heaps of mosfets and disregard the bottom half of the circuit as i only need +14V. I will also have to change the value of the zeners i take it.Not sure exactly what values to use. Please help me if you can.
Regards
Bowdown
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bowdown,
You can go with 2*IRFP064V paralled on a good heatsink
about 95/130 Amp each at 60 volts max...
and with a 16 volts zener get your 14 volts DC
use a resistor in serie for each MosFet to share the currtent... ex 0.01 Ohms / 100Watts
Transfo: 16V*150A = 2400VA * 2 coeff ==> 4800 VA min for the transfo at
14 AC output ; Full bridge at 300 Amp /50V mini ; plus a good serie of caps 1000microF/Amp * 150 = 150 000 microF minimum
Watch out the current at power-on! use some sort of triac to lower the inrush!
Regards.
Alain.
You can go with 2*IRFP064V paralled on a good heatsink
about 95/130 Amp each at 60 volts max...
and with a 16 volts zener get your 14 volts DC
use a resistor in serie for each MosFet to share the currtent... ex 0.01 Ohms / 100Watts
Transfo: 16V*150A = 2400VA * 2 coeff ==> 4800 VA min for the transfo at
14 AC output ; Full bridge at 300 Amp /50V mini ; plus a good serie of caps 1000microF/Amp * 150 = 150 000 microF minimum
Watch out the current at power-on! use some sort of triac to lower the inrush!
Regards.
Alain.
you can't answer the question unless a couple more "bits" of information are provided --
1) what is the raw, unregulated voltage you wish to regulate
2) how tightly do you need to regulate the voltage (%)
3) what are the characteristics of the load -- is the current demand continuous, as in a ClassA amp...
A power MOSFET may not be the best choice.
1) what is the raw, unregulated voltage you wish to regulate
2) how tightly do you need to regulate the voltage (%)
3) what are the characteristics of the load -- is the current demand continuous, as in a ClassA amp...
A power MOSFET may not be the best choice.
Gees guys thanx for all the info. Ok here are the answers to the questions
1- the raw(mains) power is 240Vac
2- The regulation needs to be fairly good i guess 10% or so.
3- No the current is not going to be continous.
Basically i have a car that i take to shows and has 2 Kicker Kx2500.1 amps and also 2 Kicker 650.4 amps. the 2500's are 2500wrms @ 2 ohms and each draw a considerable amount of current (comes with a 300Amp fuse each)
http://www.sonicelectronix.com/item_3846.html
The car has 5 Odyssey battries and i currently have a 50amp charger and it cannot replace the charge quick enough.
I have priced up the ready made chargers and they want like $2500 Australian for 150 amps. I already got some killer heatsinks which can be used in a tunnel assembly( i was going to fan cool them) and i was going to use a 5 farad 20V cap.I got the toroidal priced at $350 Australian.
Any extra info would be great.
Thanx again to all the guys at this awesome Website.
Regards
Bowdown
1- the raw(mains) power is 240Vac
2- The regulation needs to be fairly good i guess 10% or so.
3- No the current is not going to be continous.
Basically i have a car that i take to shows and has 2 Kicker Kx2500.1 amps and also 2 Kicker 650.4 amps. the 2500's are 2500wrms @ 2 ohms and each draw a considerable amount of current (comes with a 300Amp fuse each)
http://www.sonicelectronix.com/item_3846.html
The car has 5 Odyssey battries and i currently have a 50amp charger and it cannot replace the charge quick enough.
I have priced up the ready made chargers and they want like $2500 Australian for 150 amps. I already got some killer heatsinks which can be used in a tunnel assembly( i was going to fan cool them) and i was going to use a 5 farad 20V cap.I got the toroidal priced at $350 Australian.
Any extra info would be great.
Thanx again to all the guys at this awesome Website.
Regards
Bowdown
More batteries and time may be your cheapest answer.
Or a small gas engine and a car altenator and regulator. 1 HP will give you around 500W, so get a 5hp lawn mower engine and 2 altenators from the junk yard and run them off the same reg to help them share the load. Most alts will have a 2-3" pully, so get a 6-8" pully for the engine so you spin it fast enough.
The PSU forum would be a better place to get this sort of help.
Or a small gas engine and a car altenator and regulator. 1 HP will give you around 500W, so get a 5hp lawn mower engine and 2 altenators from the junk yard and run them off the same reg to help them share the load. Most alts will have a 2-3" pully, so get a 6-8" pully for the engine so you spin it fast enough.
The PSU forum would be a better place to get this sort of help.
You could modify and just parallel 2 server power supplys for around $60 if you need this kind of current.
How to convert Server Power Supplies - RC Groups
Takes 20 minutes and 60$ for 200amps of current with a HP PROLIANT DL580/ML570G3 RPS REDUNDANT POWER SUPPLY. P/N: 348114R-B21
How to convert Server Power Supplies - RC Groups
Takes 20 minutes and 60$ for 200amps of current with a HP PROLIANT DL580/ML570G3 RPS REDUNDANT POWER SUPPLY. P/N: 348114R-B21
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