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Original question:

Pulse trigger control circuit to fire an SCR controlled rectifier

TMS320F28379D: SCR rectifier control

rajesh beesetty
Expert 1315 points

Tool/software:

Dear Experts,

I would like to know how an SCR based rectifier is controlled using C2000 microcontrollers.

For your kind information, In the past I worked on F28335 to control the inverters. therefore, based on my previous working experience on the inverters, I would like to share my intuition on the control of rectifier. Could you comfirm if this would work?

Here is in my mind:

For example, eventually, PI control output is compared with the TBCTR register of PWM peripheral to generate the pulse. This TBCTRs are ensured in synch with the 3 phase voltages by interfacing PWMs with external zero crossing detectors.

Secondly, I wonder if QEP can be used in the rectifier control?  As per my knowledge, QEP is usually used for deriving the time between two events(rising or falling edge). If I am missing something, Please let me know.

regards,

Rajesh.

  • +1
    TI__Expert 6020 points

    Hi Rajesh, 

    I would recommend to look at few of our reference designs like the vienna 3 phase rectifier (TID 1000) and TIDA 1606 (bidirectional T type inverter) for better understanding. Atleast refer the design guide which goes on the highlevel operation that might interest you.  

    Regarding PI control output it depends if its a voltage or current control.

    For voltage --> this updates the CMPA/B value and adjust the duty 

    For current -> depends if its avg or peak current control. 

    With todays C2000's EPWM you can generate PWM control for multi-level rectifiers also. Most probably you wont be needing EQEP unless its motor or encoder related stuff. 

    Best Regards,

    Uttam Reddy