Sine wave shape distorts when transformer is connected.

[rocon123]

Control algorithm contains PI regulator.
hardware contains H-bridge inverter.
(1) when resistive load is connected at inverter output terminals, Sine shape retains(which is expected.)
(2) When i am connecting Transformer to boost current from 0.5A to 5A, sine shape convert to something like bell shape.
how to overcome this issue?

 

[GPG]

Another post full of information. PI proportional/integral?

H-bridge inverter.

PWM sine?

 

[Martaine2005]

Or possibly because another transfomer is connected to an inverter, it's an even worse modified sine wave than just the inverters modified sine wave.

Martin

 

[GPG]

Insufficient info, though you did remind me of anothr post. Ta