Hello,
I have a non-audio application that hopefully I can get some pointers on here. I am in need of a couple of 480V test signals for some microgrid integration testing.
The signal generator we have outputs +/-10V analog signals with up to 15mA output current.
My idea is to buffer this with an audio amplifier and then use a 24V:480V control transformer to get the voltage up to 480V.
The load on the amplifier is going to be minimal - likely <0.5W and will only be operating around 60 +/- 1Hz.
I will need to make 24V rms on the output, so an amplifier that does not clip above 72W (87W for +10% voltage) into 8 Ohms should suffice. And the amplifier should work stable for no load or very low load operation.
I think I should use a class AB amplifier to not have any switching ripple on the output. We can make some PWM filters but would like to keep simple if possible.
Ideally the amplifier should have low phase shift for 60Hz signals but as long as both channels have the same phase shift, I should be OK.
Not very picky on THD. Grid voltage typically has 2% harmonics (-34dB) already so an amplifier that has better than -54dB THD+N at low load should suffice.
Budget is under $200 preferably but we can spend up to $500 if needed.
Any good options you can recommend?
I have a non-audio application that hopefully I can get some pointers on here. I am in need of a couple of 480V test signals for some microgrid integration testing.
The signal generator we have outputs +/-10V analog signals with up to 15mA output current.
My idea is to buffer this with an audio amplifier and then use a 24V:480V control transformer to get the voltage up to 480V.
The load on the amplifier is going to be minimal - likely <0.5W and will only be operating around 60 +/- 1Hz.
I will need to make 24V rms on the output, so an amplifier that does not clip above 72W (87W for +10% voltage) into 8 Ohms should suffice. And the amplifier should work stable for no load or very low load operation.
I think I should use a class AB amplifier to not have any switching ripple on the output. We can make some PWM filters but would like to keep simple if possible.
Ideally the amplifier should have low phase shift for 60Hz signals but as long as both channels have the same phase shift, I should be OK.
Not very picky on THD. Grid voltage typically has 2% harmonics (-34dB) already so an amplifier that has better than -54dB THD+N at low load should suffice.
Budget is under $200 preferably but we can spend up to $500 if needed.
Any good options you can recommend?