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T O P I C    R E V I E W
EROS Posted - Apr 19 2010 : 11:51:35 AM
YS the energi cant be create or destroyed just transformed ( how 1000 watts with 2n3055 if they are 120 watts? please tell me
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audioguru Posted - Apr 19 2010 : 1:16:56 PM
You can switch a transistor on and off very quickly to make a square-wave output or make pulse-width-modulation.
When the transistor is turned on then the voltage across it is low and its wasted power that makes heat is low.
When the transistor is turned off then its current is zero so its wasted power that makes heat is also zero.

You don't use a linear audio amplifier in an inverter. If you do then for 1000W out the transistors heat with 400W or more. A little square-wave or PWM pure sine-wave 1000W inverter heats its transistors with only 50W or less.

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