Hi everyone

I am looking for a simple way to shift the voltage of a 230Vrms AC sinusoidal signal by 180 degrees without the use of a transformer.
The goal is to have the electronics as small as possible but by no means bigger than a fingernail.
The power throughput can be as low as 100mW and the efficiency does not matter (it should not burn up though )
Is there a simple solution to that? I tried playing with inductors and resistors in LTspice but it got me nowhere (no noticable phase shift for small inductor values).

thanks

 

phase shift what? I or V ?? caps and inductors provide phase seperation. and getting 180 seperation using passive means might be tough.

 

Why do you want to phase shift the voltage?

What will you power?

 

Hi everyone

I am looking for a simple way to shift the voltage of a 230Vrms AC sinusoidal signal by 180 degrees without the use of a transformer.
The goal is to have the electronics as small as possible but by no means bigger than a fingernail.
The power throughput can be as low as 100mW and the efficiency does not matter (it should not burn up though )
Is there a simple solution to that? I tried playing with inductors and resistors in LTspice but it got me nowhere (no noticable phase shift for small inductor values).

thanks

Howdy.

Do you have to have a ground reference? If not, you can just switch the polarity of the leads!

Eric

 

I just made a drawing of what I want to do with the signal and realized: I need a 90° shift, not 180°.

So what I need is to shift the Voltage by 90°. The problem is, that I have a capacitive load that has a high series resistance (a few pF with a series resistance of about 10kOhms). The simplest way would be to add an inductance so the total impedance is dominated by the inductor.
Any suggestion? Keep in mind that the electronics have to be really small, so an inductance above 50uH is hard to achieve.

 

I just made a drawing of what I want to do with the signal and realized: I need a 90° shift, not 180°.

So what I need is to shift the Voltage by 90°. The problem is, that I have a capacitive load that has a high series resistance (a few pF with a series resistance of about 10kOhms). The simplest way would be to add an inductance so the total impedance is dominated by the inductor.
Any suggestion? Keep in mind that the electronics have to be really small, so an inductance above 50uH is hard to achieve.

AAC has some tutorials on this:
http://www.allaboutcircuits.com/vol_2/chpt_4/2.html