I have an inverter that converts 24 V DC to a 48 VAC peak-to-peak square wave with a frequency of 55 Hz. I am then going to use a step-up transformer to output 120 VAC to power some rocket valves that take maximum 150 VA.
My approach was to use an active wide band pass filter to convert the square wave into a sine wave. The schematic has a first order high pass filter, a non-inverting amplifier that controls the gain, and a low pass filter.
I set the HPF's cutoff frequency to be 50 Hz (\$f_o = 1/(2*\pi*R*C) \$ for a first order filter) and the LPF to be 60 Hz. I also set the gain to be 1 by setting \$ R_4 = 1M\$ and \$R_3=100 \$.
What is wrong in this setup? Why is the output sine not a perfect wave? And if this op-amp cannot provide the inrush current needed, what circuit is capable of preserving power while converting this square into a sine?