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Recent content by Romeo shashi

  1. R

    Synchronous rectification

    Hello all I am working on 3K phase shift Fullbridge converter here Iam getting softswitching in the primary and in the secondary I am using Diode rectification and Iam getting around 85% efficiency at 1Mhz But I would like to replace these Diodes with MOSFETS to improve the efficiency. How can...
  2. R

    Voltage rating of Series capacitor in primary of full-bridge smps

    Thank you for reply, I have put a 13ohm resistance at the Mosfet gate drive now Iam getting 3141watts at the input side and 1752watts at the output side with 55.7% efficiency Iam observing most of the loss is in the Transformer part because the current at Lp is 6Amps and current at Ls is...
  3. R

    Voltage rating of Series capacitor in primary of full-bridge smps

    Hi, I also want to simulate 3K fullbridge DC DC converter with the following parameters in LT spice with 95% efficiency. Here the problem is how to find the transformer specifications like leakage inductance and inductance. In my simulation Iam getting 92% efficiency but the Pi = 956w and Pout =...
  4. R

    Phase shift full bridge converter with synchronous rectification

    Hi, I would like to simulate fullbridge DC DC converter with the following parameters in LT spice with 95% efficiency. Here Iam doing synchronous rectification on the secondary side the delay between SA,SB and SC,SD is 50ns and overlap between M5&M6 is 100ns with dutycycle of 45%. but Iam...
  5. R

    [SOLVED] 900 W DC/DC Full Bridge Converter

    hej thank you for reply, I have tried to simulate the model in Lt spice with the above mentioned parameters to get 95% efficiency but Iam not able to get that. can any one tell me how can i choose the transformer primary and secondary resistance and leakage inducatance of transfomer to get...
  6. R

    [SOLVED] 900 W DC/DC Full Bridge Converter

    Thank you for reply! I have tried with these specifications in LTspice but I am getting only 53%efficiency what parameters can i change in this ckt to get 90% efficiency? I am trying to do synchronous rectification with phase shifted Fullbridge converter with above specification. please find...
  7. R

    leakage inductance of transformer

    Hi, I want to simulate fullbridge DC DC converter with the following parameters in LT spice with 95% efficiency. Here the problem is how to do softswitching(ZVS)? i have atached my LT spice file. andd also i want to find the transformer specifictions like leakage inductance and resistance of...
  8. R

    [SOLVED] 900 W DC/DC Full Bridge Converter

    Hi, Thank you for reply andrew that tool looks interesting but my frequency is 1mghz but in this tool i can give only up to 300hz.. can any one tell me how can i do softswitching(ZVS) in fullbridge converter? i have attached my LTspice file here but Iam doing hard switching here. can any one...
  9. R

    leakage inductance of transformer

    Hi thank you for your reply, I want to simulate fullbridge DC DC converter with the following parameters in LT spice with 95% efficiency. Here the problem is how to find the transformer specifications like leakage inductance and inductance and Resistance of primary and secondary with out...
  10. R

    [SOLVED] 900 W DC/DC Full Bridge Converter

    Hi, I also want to simulate fullbridge DC DC converter with the following parameters in LT spice with 95% efficiency. Here the problem is how to find the transformer specifictions like leakage inductance and inductance and restance of primary and secondary with out using core. can any one...
  11. R

    leakage inductance of transformer

    Hi, I would like to caluculate the leakage inductance of transformer? i have caluculated the mutual inductance and self inductance can any one provide me formula to find the leakage inductance of transformer? Mutual Inductance(Lm) Lm = (1.256*10^-6 * Np * Ns * Ac) / (Le) Self inductance...
  12. R

    transformer losses caluculation

    Hello, Thank you for replying It is a high frequency DCtoDC converter so my specifications are like that i have to find the transformer losses at these power and at different frequencies. Currently I am caluculating with 500khz and 1megahz now i have calculated the copper losses using...
  13. R

    transformer losses caluculation

    Hi Anna thanks for the reply!!! Here i need to find the losses in the transformer at different frequencies like 100khz(kilohertz) to 1mhz(megahertz).I am using fullbridge converter topology(input-400v and output-28v), can you please suggest me how to find transformer losses by using winding...
  14. R

    transformer losses caluculation

    Hello, I want to use ferrite material core to design transormer in stepdown full bridge DC to DC coverter and the turns ratio I am getting Np:Ns =>14:1 so can you sujest me a method to caluculate transformer core and copper losses which includes winding resistance and resistance of the core in...
  15. R

    Transformer design using ferrite materials in fullbridge converter

    Hello, I want to use ferrite material core to design transormer in stepdown full bridge DC to DC coverter and the turns ratio I am getting Np:Ns =>33:1 so can you sujest me a ferrite material which can have low fluxdensity(B) and cross sectional area(Ac) in order to acheive my turns ratio 33:1...
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