Class AB Amplifier With Negative Power Output

ericgibbs

Joined Jan 29, 2010
11,133
hi,
Look at this PwrBug asc file.
There is a 'funny' in LTS regarding which way around a resistor is, that determines the direction of current flow, hence the neg power.
Use key F7 to grab the RL resistor, then CTL+R key and rotate it by 180 degrees.
Clear the plot and re-run the sim, it should be the same positive power label value as mine.
E
 

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elec_eng_55

Joined May 13, 2018
214
hi,
Look at this PwrBug asc file.
There is a 'funny' in LTS regarding which way around a resistor is, that determines the direction of current flow, hence the neg power.
Use key F7 to grab the RL resistor, then CTL+R key and rotate it by 180 degrees.
Clear the plot and re-run the sim, it should be the same positive power label value as mine.
E
That is really weird eh. Thanks so much Eric. You made my day!
 

MrChips

Joined Oct 2, 2009
22,101
Remember that power is proportional to the square of the voltage or the square of the current.
Hence power cannot have a negative value, unless you are referring to the flow of power or loss of power, i.e. a difference in power values.
 
nce power cannot have a negative value, unless you are referring to the flow of power or loss of power, i.e. a difference in power values.
Not entirely true.

Power delivered is negative and power dissipated is positive.

e.g. 100 W = 10 * 10 W; A 100 W power supply supplying power to 10 items.

0= -100+10 *10

But we don't call a 10 MW power plant a -10 MW power plant.
 
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