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Original question:

TIDA-00961: Several Questions to TIDA-00961 PFC

TIDA-00961: TIDA-00961 questions

Patrick Amiras
Prodigy 120 points

Part Number: TIDA-00961

Dear "Watermelon Noodles",

thank you for your help. There are some more questions appearing:

1) How much bulk capacitance did you use? Which voltage rating? C=? Vmax=?

2) You wrote:  "check your power stage can work well with DC input and open loop condition;"

Do you mean to apply a DC voltage in the place of the ac input voltage and to create a boost converter?

In the C-code, I found the definition

// Check system under DC condition (cleanest SFRA curves) 0 is FALSE, 1 is TRUE

#define DC_CHECK 0

Does this mean that if I define this to 1, then I can supply a DC voltage instead of an ac voltage and the controller runs in open loop, boosing up the applied voltage? I will be happy for some more explanation about this "DC_CHECK" variable and how to use it correctly.

3) I already found out that the flyback auxiliary supply starts at about 120V. So increasing the voltage slowly from 0 to 120V, I can do this, but operation I will not see below 120V.

Many thanks.

Best regards

Patrick

 

  • 0
    TI__Expert 6730 points

    Hi, patrick

    as below:

    1) How much bulk capacitance did you use? Which voltage rating? C=? Vmax=?

    Ans: our test is based on 3 220uF450V capacitances.

    2) You wrote:  "check your power stage can work well with DC input and open loop condition;"

    Do you mean to apply a DC voltage in the place of the ac input voltage and to create a boost converter? 

    In the C-code, I found the definition 

    // Check system under DC condition (cleanest SFRA curves) 0 is FALSE, 1 is TRUE

    #define DC_CHECK 0

    Does this mean that if I define this to 1, then I can supply a DC voltage instead of an ac voltage and the controller runs in open loop, boosing up the applied voltage? I will be happy for some more explanation about this "DC_CHECK" variable and how to use it correctly. 
    Ans: I am not very sure for the firmware issue. you may check it with low voltage & low power condition. 

    3) I already found out that the flyback auxiliary supply starts at about 120V. So increasing the voltage slowly from 0 to 120V, I can do this, but operation I will not see below 120V. 

    Ans: With DC input, you can use external bias power the control stage first.

  • 0 in reply to Desheng, Guo
    TI__Expert 3680 points

    Hi Patrick,

    For the second question, as the below TIDA-00961 guild book said, that if you run the project in open loop, you should make sure that INCR_BUILD is set to 1, DEMO_MODE is set to 0, and DC_CHECK is set to 1 in the pfc2philtrmttpl_settings.h file. For the more steps, you could refer to this guild book. TIDUDU4A.pdf

    -Rayna