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Old 24th January 2013, 03:22 AM   #1
mulyo is offline mulyo  Indonesia
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Default [Ask] Bridge amplier topology

I'm still don't understand the advantage and this advantage between this two bridge topology. Can anyone explain the advantage and this advantage?
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Old 24th January 2013, 04:42 AM   #2
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The signal is fed to each of 2 amplifiers' input terminals in reversed phase. The output then, as measured between both positive terminals, is twice that from either single amplifier positive to negative terminal (in normal configuration). That is what "Bridge-Tied Load" means. That is also the same basic scheme for connecting 2 separate mono amplifiers or stereo channels in "bridge-mode" as you see in PA and automotive applications.

Thus you have twice the voltage swing and power for the same supply voltages but you don't have matching increased current capability, so the load impedance rating should be raised from say, 4R minimum to 8R minimum for an equivalent safety margin.

It is a popular means of extending a basic range of amplifier products by just adapting them to BTL connection but the limited current capacity requires better protection and careful planning. It could be said that it is better to use more appropriate designs in the first place.
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Old 24th January 2013, 08:52 AM   #3
mulyo is offline mulyo  Indonesia
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Thank you for the explanation
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Old 24th January 2013, 10:18 AM   #4
AndrewT is offline AndrewT  Scotland
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The bridged amplifiers deliver double the power to the doubled load impedance.
If you sum the total power delivered by each of the amplifiers to it's rated load, you will find that the two amplifiers deliver exactly the same power as the bridged arrangement. NOTHING is gained by bridging.

Two 50W into 4ohms amplifiers deliver 100W into the two 4r0 loads.
A bridged pair of these same amplifiers delivers 100W into 8r0.
Exactly the same power from both arrangements.
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Old 24th January 2013, 10:34 AM   #5
FoMoCo is offline FoMoCo  United States
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Quote:
Originally Posted by AndrewT View Post
NOTHING is gained by bridging.
There is some cancellation of distortion by bridging. In theory, close to perfect. In reality, closer to nothing.
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Old 24th January 2013, 12:13 PM   #6
sregor is offline sregor  United States
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One advantage is that bridged amps can be run direct coupled with single PS voltage. One of the reasons it is so common in car amps.
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Old 24th January 2013, 12:56 PM   #7
JMFahey is offline JMFahey  Argentina
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Quote:
NOTHING is gained by bridging
Well, no *extra power* is gained, but it can be achieved at a more convenient impedance.
That counts as "gaining" in my book.
Besides the classic car audio amps, I can offer another example from the MI world: the excellent Crate Powerblock guitar amp has two 75W/4r amps , which forces you to find two 4 r Guitar speakers (not very common) or carry two 2 x 12" cabinets (bulky) *or* , thanks to bridging, get 150W/8r , which allows you to make a single compact and very loud single 12" cabinet, using, say, an EVM12L or equivalent.
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Old 24th January 2013, 01:37 PM   #8
DRC is offline DRC  United Kingdom
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Am I looking at a different image ??

Configuration 1 clearly won't work but I could guess it is suppose to be an "Alexander" type amplifier ?

dc
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Old 24th January 2013, 04:24 PM   #9
mulyo is offline mulyo  Indonesia
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Originally Posted by DRC View Post
Am I looking at a different image ??

Configuration 1 clearly won't work but I could guess it is suppose to be an "Alexander" type amplifier ?

dc
I got from electroschematics. 200W Transistor Audio Amplifier Circuit I don't know if it work or not. I'm still learning about audio amplifier
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Old 25th January 2013, 01:14 AM   #10
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That schematic is correct but difficult to understand unless you know what to look for. Try this:
Google Image Result for http://lenardaudio.com/education/images/a12/a12_bridge-management.gif
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