BridgeClone with current-dumping circlotron afterburner :-)

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#21
Not unusually big - the efficiency is the same as a normal class AB amp. BTW I have changed the load to a more real-world 2.8 ohm + 2.8 ohms J so the current lags by 45 degrees. This works out to 4 ohms impedance. Resistive loads are just plain wussy for an amplifier to drive.

The curves below are:
Red - output voltage across load.
Green - Power across resistive portion of load.
Blue - dissipation in one mosfet, peak for SOAR, mean for heatsinking.
Black - load current.

DC input power would be 252.4 + 79.17 + 79.16 + opamp power dissiation.
 

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#28
Circlotron said:
Output waveform either side of load.
Click to expand...

Hi,

I also made a model, becouse I was thinking, that the crossover distortion will be quite much.
And here we go. 10 kHz and the xover distortion is huge (between the opamps and the MOSFETs)

i dont know any method to avoid it....

any toughts?

BTW I dont know, how the output graphs were so good from your simulation... Oh yeah at 1 kHz it looks good... Now I know...


cheers,

Tamas
 

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#29
 

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