Tool/software:
The calculated Shim Inductor value is 82nH as per the equation given in the application report( UCC28950 600W Phase Shifted Full Bridge Design Review/Application Report (Rev. D) .This was too small value and which doesn’t make sense for circuit so we referred research paper(https://www.researchgate.net/publication/312562423_Design_and_simulation_of_phase-shifted_full_bridge_converter_for_hybrid_energy_systems ) and got 5uH value . In 5uH we were not able get 196.8 V for max duty cycle So we tuned Shim Inductance for better efficiency and need to get stable output upto 4KW . We can able to load upto 4KW with 0.2uH shim as well as without Shim.
|
Shim Inductance Design Specification |
||
|
S:NO |
Parameter |
Value |
|
1 |
Transformer Leakage Inductance |
10nH - 150nH |
|
2 |
Nominal Mosfet Ouptut Capacitance (Coss_Nom) |
2496pF |
|
3 |
Maximum Mosfet Ouptut Capacitance (Coss_Max) |
1920pF |
|
4 |
Dead time |
500ns |
Is it okay to go ahead without Shim (only with transformer leakage inductance 150nH) . Kindly suggest better with 0.2uH shim or without shim from Ti side.
General Specification:
Input Voltage - 51.7V
Output Voltage -196.8V
Output Current -20A
Input Avg Curr - 120A
