using 220v amplifier in car with inverter - diyAudio
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Old 5th October 2012, 08:29 PM   #1
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Default using 220v amplifier in car with inverter

Hi
I am planning to use my dual yamaha amplifiers 300W per channel for car components front and back.
I intend to use a 12V to 220v inverter/
My question is that would its power supply and RC input could maintain noise rejection in car ???
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Old 5th October 2012, 09:05 PM   #2
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I believe inverter still would introduce nasty noise, and overall efficiency wouldn't be too high. Not sure about your amp's PSU, but I believe it outputs +-X volts, you could power it directly from car SMPS like 12V -> +-X volts.
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Old 5th October 2012, 09:14 PM   #3
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Thanks.
The inverter output frquency is 60Hz. i intend to step up to say 6KHz .
now the input to the mains transformer of amplifier will be 220V , 6KHZ, and high inductance of input transformer may provide lesser losses, better regulation , less transofrmer hating up and i assume better efficiency than running the amplifier on 60Hz mains ????
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Old 5th October 2012, 10:04 PM   #4
wg_ski is online now wg_ski  United States
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The eddy current losses in the trafo will go insane, causing it to heat up more. And the regulation will be 100X worse due to the leakage inductance, not 100X better. Impedance increases with frequency.

If you want some compromise by increasing the frequency, try something like 200-400 Hz. Most 60 Hz trafos will do "ok" up a little higher but 6k is asking for trouble.
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Old 6th October 2012, 01:10 PM   #5
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Got it, will go with 400 HZ that would keep the trafo in check for heating up.
But my question remains about the PSRR ancd CMRR in car setting ?
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Old 6th October 2012, 01:47 PM   #6
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on more question. if its a square wave inverter with 50 percent duty cycle do i need to decrease the applied voltage as i believe RMS volts would increase /
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Old 6th October 2012, 02:40 PM   #7
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Please, don't do that. Destroying a fine amplifier by plugging it to an inverter that puts out a horrible signal is an inforgettable sin. In addition 400 Hz is well above 50 Hz and the transformer would suffer.
Keep the valuable Yamaha at home and buy a 12 V-powered, D-class amplifier.
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Old 6th October 2012, 07:50 PM   #8
wg_ski is online now wg_ski  United States
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400 Hz is too high with square wave, but should be ok for sine. For square wave, keep it closer to 60 Hz. Maybe 100 would be ok - the 3rd harmonic would be under the 400 Hz commonly used aircraft power. Use a (symmetrical) 25% duty cycle at 300V peak for 220V RMS. Building an inverter like this, however, is not necessarily a trivial task. It sounds easy enough but audio gear is not like a flourescent light, or even an A/C motor. You may find it working quite well at light or continuous load, but with a varying load like an audio amp you can run into stability problems. Or blow out all your hexfets the very first time you try to charge the reservoir caps.

If the amp's PSRR sucks at some of the high order harmonics (say, 1 KHz) you can end up with an annoying buzz or squeal that you can't get rid of.
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Old 7th October 2012, 12:37 AM   #9
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Quote:
Originally Posted by muddasirwaheedmalik View Post
Hi
I am planning to use my dual yamaha amplifiers 300W per channel for car components front and back.
I intend to use a 12V to 220v inverter/
My question is that would its power supply and RC input could maintain noise rejection in car ???
If you're going to that much trouble it would make sense to completely remove the Yamaha transformer and modify the inverter to put out the proper Voltage for the Yamaha directly. What's the point of a transformer feeding a transformer?

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