As the title reads, I wish to use a power amplifier (say OPA541) in the power stage of a 50W pure sine wave inverter? How to find the efficiency of this approach? Since the amplifier itself will be sourcing all the current...efficiency may be low? is that true? how low will it be?
I need a variable frequency variable voltage AC source where I can move the frequency from 40Hz to 80Hz. It should be easy to create a variable frequency sinewave, either analog or mcu based. This can be sent to the input of a power amplifier to get the required signal which can then be stepped-up using a suitable transformer. The amplitude can be changed by changing the feedback resistance on the amplifier. My power requirements are 120VAC, 3A for the output. So I was thinking OPA541 (80VDC, 10A) should be a good option.
Is this a good design for a lab source?
what I really need is a 3 phase inverter !!. Once single phase is done, I was planning to use a cd4027 to get 120degrees phase shifted signals and send them to independent power stages.
Your insights shall be very helpful.
Thanks and best regards, Vishal