How to design control feedback loop to control duty cycle of AC to DC Converter?

[Bindu boora]

How to design control loop for duty cycle.I have gone through few papers .There was a gain Gvd which is transfer function Vout/duty cycle.How to derive this gain value?My circuit consists of AC supply of 110 to 120 V 400hz given to a transformer which give 5V and 4 mosfets connected to LCL filter? I need to regulate output voltage to 5V and output ac ripple should be 5mV and load regulation is 0.05%.Im not understanding how to design control loop.Can I get a clear steps to do it.I have gone through few papers containg error amplifier connected to lead lag compensator then to comparator for PWM to a mosfet drive and the connected to mosfet.How to design the compensator?I needs bode plot but I need Gvd value and everywhere I can find the gain value for LC filter but my filter is LCL.
Please help me

 

[FvM]

The intended operation isn't quite clear. The shown circuit isn't well suited to perform PWM. It can be operated as synchronous rectifier. To work as PWM boost converter or PFC converter, it must be supplemented with an input inductor and a filter capacitor blocking high frequent current.

--- Updated Oct 17, 2020 ---

A single phase 400 Hz rectifier will generate 800 Hz ripple in any case. To reduce the ripple, you need to place a DC/DC buck or boost converter after the rectifier filter capacitor. The most simple topology would be transformer, bridge rectifier, filter capacitor, buck converter.

 

[Bindu boora]

Is it not possible to build an ac to dc converter with which has a feedback which can control duty cycle in order to get required 5v regulated output voltage?using PI controller?

 

[Easy peasy]

not with your ckt, the diodes are always there ...

 

[Bindu boora]

not with your ckt, the diodes are always there ...

Is it possible to design a single phase buck rectifier which has a regulated output?

 

[BradtheRad]

Is it possible to design a single phase buck rectifier which has a regulated output?

Yes, however... You state your transformer is 5V, therefore it implies peak waveforms of 6 or 7 volts. A simple voltage regulator (shunt or series, whichever suits) might be sufficient. It may be difficult to achieve your desired spec for ripple and regulation, depending on how heavy your load is, and how suddenly it changes.