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high power car amplifier

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pes68

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I wana designing an high power car amplifier circuit (1000 watts rms) (mono)
What class of power amplifier do I use?
What IC can be used in my design?
Schematic of a similar circuit?
 
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THINKER_KAM_MAN

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wow 1KW into what speaker impedance?

1KW of power not a problem use a 2KW rms supply
invert (12 to +-100V say), and use class D, or class AB, amplifier design.
avoid bridging.
 
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pes68

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load impedance is 2 or 4 ohm

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wow 1KW into what speaker impedance?

1KW of power not a problem use a 2KW rms supply
invert (12 to +-100V say), and use class D, or class AB, amplifier design.
avoid bridging.


How to convert 12dc to +-100dc !?
 
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pes68

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You do realize that you can likely buy such an amp much cheaper than you can built one (?).
yes i can buy , but i wana design for my University.This is my class project
 

pes68

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If I'm not mistaken about 12 volts and 30 amps of electric vehicles is
The maximum power of 360 W is delivered
How some companies have higher power amplifiers are included on your product?
 

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Cars with very high power audio systems often use extra batteries and alternators to supply enough power.
 
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pes68

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A schematic of the circuit is a high power car amplifier ???!???
 

THINKER_KAM_MAN

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load impedance is 2 or 4 ohm

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!?

well, from what i have read so far you need an inverter to get +-75V, i would say the easiest way to do this if you are at uni
is to utilize 2 0ff 800W micro-wave oven transformers.
you can find them chuck all about the place these days
then make up a simple inverter using power logic fets driven by an
oscillator. micro wave oven transformers are 240 I/P 2KV o/p
1:8.33 so 12 * 8.333 = 100V = 70Vrms.

otherwise you can design a booster type switching power supply.
using a large inductor
 
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KlausST

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Hi,

for 1kW @ 4Ohms you need: U = sqrt( 1000W * 4Ohms) = sqrt(4000V*V) = 63V. This is for DC.

For sine you need +/-63V * sqrt(2) = +/-89V peak (likely undistorted at the output)
It also means +/-89V/4 Ohms = +/-22.25A of current plus some headroom (because the load is not even and exactely 4Ohms)

So you need (depending on technique) at least +/- 95 V supply voltage.

I´d use a class D bridged. (in total i find it more simple, especially a more simple power supply, less output offset voltage problems)

But THINKER_KAM_MAN wrote:
avoid bridging
Maybe he can give you more information about his statement. (power loss? quality?)

Klaus
 
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THINKER_KAM_MAN

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Hi,

for 1kW @ 4Ohms you need: U = sqrt( 1000W * 4Ohms) = sqrt(4000V*V) = 63V. This is for DC.

For sine you need +/-63V * sqrt(2) = +/-89V peak (likely undistorted at the output)
It also means +/-89V/4 Ohms = +/-22.25A of current plus some headroom (because the load is not even and exactely 4Ohms)

So you need (depending on technique) at least +/- 95 V supply voltage.

I´d use a class D bridged. (in total i find it more simple, especially a more simple power supply, less output offset voltage problems)

But THINKER_KAM_MAN wrote:

Maybe he can give you more information about his statement. (power loss? quality?)

Klaus

Bridging? OK bridge if you want.
but at 1KW O/P she is gona blow scotty.
lots of time, before she gets going.

after the inverter/voltage booster is built
if class AB amp its easy to get your power O/P
all that's needed is capable transistors at the o/P
or you could use a class "D" amp but they are nasty
things. ok for Pop may be.
also yea 22A of signal currunts required
approx 130A from you battery dependent
efficiency. scotty she will work
 
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schmitt trigger

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Have you -at least- ever designed or built either a low power class-D amplifier or SMPS? If not, I would suggest that you do it first, and get your feet wet on the devilish details of those circuits.

In particular, the design of the magnetic components for the SMPS at those high power values is a science on itself. Also, heat removal, board layout, closed loop stability, circuit protection...those take lots of experience to properly master.

I am not attempting to discourage you. All I'm saying is that you need to learn to crawl, then to walk, before you can run.
 
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