Inverter for Turntable PSU ?

[G Doggett]

This may be a silly question, but would it be possible or feasible to use an inverter that converts 12 volts dc to 120 or 240 volts ac to power a turntable synchronous motor ? Some are listed as producing a pure sine wave as opposed to a modified sine wave.

 

[JonSnell Electronic]

As long as the frequency is stable and the wave form is not too square, I see no reason not to.

 

[ralphfcooke]

Though I am very happy with Bill(Pyramid's) SG4 I am always on the lookout for alternative ways of doing things. Recently I came across this :-
Pure Sine Wave Inverter Driver Board EGS002 "EG8010 + IR2110" Driver Module | eBay
I haven't tried it yet, and it needs an output stage, but it does look interesting, especially for older, larger, single phase devices like the TD124, 301,401,etc.

 

[Pyramid]

Ralph-

Be aware that the EGS002 is not analog output, it is PWM. It is designed to drive a HV SMPS output stage. If implemented correctly, you could create 115/230VAC 50/60Hz without a step up transformer, but it would require a decent output filter as well to reduce EMI.

 

[ralphfcooke]

Hi Bill, yes, I did have a look at the output stage characteristics, I'm not sure the output is PWM. Have a look here:-
https://www.egmicro.com/download/EGS002_manual_en.pdf

 

[Pyramid]

It is most definitely digital output (PWM), but an unusual configuration. The upper bridge is the PWM sinewave with both halves centered and the bottom bridge shifts the reference point (neutral line) at the line frequency. The output filter is L1 & C22 on the output amp section and is only necessary on the high frequency PWM bridge that produces the AC waveform.