How Works upper volt in car Amplifier???

Dj BASS AMP · 14th July 2002, 12:08 AM

How Works upper volt in car Amplifier???
i need it in Circuit and image

(the upper volt is up from 12V in the car AMPLIFIER to high volts (30V + )

thanks alll !!!!!!!!!!!!....

Lisandro_P · 14th July 2002, 02:36 AM

It's a special powerssupply called "switchmode". The basic idea is that you generate an AC wave from the car's battery DC, increase it's voltage via a (usually small) transformer and then rectify it again with a diode bridge to get DC again, but at a higher voltage. Usually the AC wave is square and high frequency, so the efficiency of this kind of circuits it's rather high (90% is not uncommon), yet, they're NOT trivial to design or build.

Rod Elliot ( www.sound.westhost.com ) had a few very good articles and proyects on these kind of psu's.

Dj BASS AMP · 14th July 2002, 05:10 AM

I need Circuit to...

jackinnj · 14th July 2002, 01:35 PM

The pdf is from On-Semi (formerly Motorola) of a high current, high voltage "off-line" switcher. Off-line switchers, as the name implies, take the juice right out of the wall socket and convert it to DC. The reason that I mention this one is that a PCB layout is given. Furthermore, you can omit the rectifier on the input since you will be taking 12VDC from the battery, and of course you will have to change the transformer, etc.

http://www.onsemi.com/pub/Collateral/MC33362-D.PDF

Before you get started building a switcher, you should read the tutorials on National Semi and Linear Technology. Furthermore, Nat Semi has some easy to use design software on their site.

http://www.linear.com/pdf/an73f.pdf
http://www.national.com/ds/LM/LM2587.pdf

International Rectifier has a good tutorial on switching ps transformer design on their website:
http://www.irf.com/technical-info/appnotes/an-1024.pdf

Pay very close attention to specifications of all diodes, inductors, capacitors etc.

Why isn't TI mentioned here? I find their website unuseable. I was once a fan of Unitrode parts, but they have made a salad of the information. They are the largest company in the biz, however. Pity.

Keld · 14th July 2002, 02:15 PM

Quote:

I need Circuit to...

As Lisandro_P wrote Rod Elliot has a project WITH circuit and some more:
http://www.sound.westhost.com/project89.htm

Keld

gromanswe · 14th July 2002, 07:53 PM

Before Starting to build a "not trivial" switchmode PSU,
you might be interested to know,
that there are a bunch of Step up Regulators
that come in form of ICs.
They can be for one voltage or be Adjustable.

Some examples:
LM2577 PDF download
LM2588 PDF download
just paste those two lines, one at the time,
into Google Search, http://www.google.com/

the first is for max 3A max 37 volt out
the other can deliver 5A

I am sure the other guys here can give some more ICs

gromanswe
switching up

Dj BASS AMP · 14th July 2002, 09:24 PM

thanks alllllllllllllllll !!!!!!!!!!!!

14th July 2002, 01:35 PM	#4
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	This will give you an idea The pdf is from On-Semi (formerly Motorola) of a high current, high voltage "off-line" switcher. Off-line switchers, as the name implies, take the juice right out of the wall socket and convert it to DC. The reason that I mention this one is that a PCB layout is given. Furthermore, you can omit the rectifier on the input since you will be taking 12VDC from the battery, and of course you will have to change the transformer, etc. http://www.onsemi.com/pub/Collateral/MC33362-D.PDF Before you get started building a switcher, you should read the tutorials on National Semi and Linear Technology. Furthermore, Nat Semi has some easy to use design software on their site. http://www.linear.com/pdf/an73f.pdf http://www.national.com/ds/LM/LM2587.pdf International Rectifier has a good tutorial on switching ps transformer design on their website: http://www.irf.com/technical-info/appnotes/an-1024.pdf Pay very close attention to specifications of all diodes, inductors, capacitors etc. Why isn't TI mentioned here? I find their website unuseable. I was once a fan of Unitrode parts, but they have made a salad of the information. They are the largest company in the biz, however. Pity.

14th July 2002, 07:53 PM	#6
gromanswe Account Disabled Join Date: Jul 2002 Location: North	Before Starting. Before Starting to build a "not trivial" switchmode PSU, you might be interested to know, that there are a bunch of Step up Regulators that come in form of ICs. They can be for one voltage or be Adjustable. Some examples: LM2577 PDF download LM2588 PDF download just paste those two lines, one at the time, into Google Search, http://www.google.com/ the first is for max 3A max 37 volt out the other can deliver 5A I am sure the other guys here can give some more ICs gromanswe switching up

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14th July 2002, 02:36 AM	#2
Lisandro_P diyAudio Member Join Date: Oct 2000 Location: Argentina	It's a special powerssupply called "switchmode". The basic idea is that you generate an AC wave from the car's battery DC, increase it's voltage via a (usually small) transformer and then rectify it again with a diode bridge to get DC again, but at a higher voltage. Usually the AC wave is square and high frequency, so the efficiency of this kind of circuits it's rather high (90% is not uncommon), yet, they're NOT trivial to design or build. Rod Elliot ( www.sound.westhost.com ) had a few very good articles and proyects on these kind of psu's.

14th July 2002, 05:10 AM	#3
Dj BASS AMP Account Disabled Join Date: Jul 2002	I need Circuit to...

14th July 2002, 09:24 PM	#7
Dj BASS AMP Account Disabled Join Date: Jul 2002	thanks alllllllllllllllll !!!!!!!!!!!!