Boostor, an ideal companion for a Circlophone on the move - diyAudio
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Old 19th May 2012, 07:18 PM   #1
Elvee is offline Elvee  Belgium
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Default Boostor, an ideal companion for a Circlophone on the move

For those wanting to enjoy the Circlophone (or any other conventional amplifier) elsewhere than at home, here is a simple and economical solution.

It is a simple, non-regulated charge-pump converter.

The components are cheap and universally available, yet the performances are decent (η > 90%).

The continuous output power is ~175W with adequate heatsinking, which is more than sufficient for a 2 x 80W amplifier (used for actual musical signals, obviously).

It could also serve as a base for other projects: a mobile 0->+/-20V 3A lab supply for example.

The oscillation frequency is ~22KHz, just outside the audio range.

For automotive applications, a ruggedized input filter + fusing is recommended.
At the amplifier level, additional decoupling is also recommended.

Needless to say, all the capacitors must be low esr.
Attached Images
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File Type: jpg Boostor1.jpg (179.6 KB, 428 views)
File Type: jpg boostor3.JPG (447.3 KB, 415 views)
File Type: jpg Boostor4.JPG (342.1 KB, 393 views)
File Type: jpg Boostor5.jpg (98.9 KB, 375 views)
Attached Files
File Type: asc boostor.asc (7.2 KB, 52 views)
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Last edited by Elvee; 19th May 2012 at 07:20 PM.
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Old 20th May 2012, 01:26 AM   #2
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Hmmm.... very good... opens up new possibilities!
Thank you, sir!
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Old 20th May 2012, 08:16 AM   #3
heinz is offline heinz  Germany
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Elvee,

nice "cut & paste construction" :-)
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Old 24th June 2012, 10:40 AM   #5
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Elvee, i love the DIY-friendlyness of your ideas. They work and don't need mysterious requirements while keeping it simple.
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Old 24th June 2012, 12:38 PM   #6
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Very Cool and doesn't require a huge inductor !!!

jer
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Old 25th June 2012, 09:14 AM   #7
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by tiefbassuebertr View Post
Basic Idea is very interesting. Unfortunately filed by "Power supplies" instead "Solid State".
It is no more than a power supply booster/adapter without great originality.
It allows you to operate a classic living-room class AB amplifier from a 12V source, and it does so cheaply, simply and reliably.
No rocket science, but useful and effective.

Quote:
Elvee, i love the DIY-friendlyness of your ideas. They work and don't need mysterious requirements while keeping it simple


Quote:
Very Cool and doesn't require a huge inductor !!!
The inductor is not even required: it reduces the peak currents in in the MOSfets, and equalizes the V+ and V- voltages under load, but the circuit will work without.
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. .Circlophone your life !!!! . .
♫♪ My little cheap Circlophone© ♫♪
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Old 25th June 2012, 12:14 PM   #8
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Very interesting !

I have often wondered if such a topology might work.
I have done similar circuits using multipliers in simulations, But I have not yet built one.
I noticed the large valued capacitors in the multiplier stage and this is the key to getting a high current output as well as the higher switching frequency.

I was thinking that the inductor was used as it is in a boost converter.
As I was trying to figure out how to design a high current boost converter at one point to power some chip amps off of a car battery in a vehicle.
It was based on a circuit on page 2 of project 105 of Rod Elliot's website, But I never got any farther than the simulations.

Great Work !!!!

jer
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Old 25th June 2012, 01:58 PM   #9
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by geraldfryjr View Post
I noticed the large valued capacitors in the multiplier stage and this is the key to getting a high current output as well as the higher switching frequency.
Needless to say that all the big E-lytics must be low esr, otherwise they will blow up in a matter of minutes.
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. .Circlophone your life !!!! . .
♫♪ My little cheap Circlophone© ♫♪
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Old 26th March 2013, 07:28 PM   #10
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Hello, it's a really nice circuit. I wonder if I could use something like 555 generator to drive FETs? Also, could you please upload CD40106B.asy file so I can play with it in Spice?

Best regards, Vic.
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