SLLA497 September   2020 TMS320F28P550SJ , TMS320F28P559SJ-Q1

 

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4.5 Summary of DC/DC Topologies

Table 4-1 compares and summarizes the previously-discussed DC/DC topologies.

Table 4-1 Pros and Cons of DC/DC Topologies
LLC Converter Phase-shifted Full Bridge (PSFB) Dual Active Bridge (DAB) DAB in CLLC Mode
Peak device stress on primary and secondary side High Mild low Lowest High
Transformer KVA rating High Medium Low High
Power output to transformer KVA rating Low Medium High Medium
Input and output capacitor RMS currents High Medium Low High
Operation Unidirectional Unidirectional Bidirectional Bidirectional
Conduction losses High Medium Lowest Medium
Turn ON switching loss ZVS ZVS ZVS ZVS
Turn OFF switching loss Low (ZCS) High High (device turn off at peak leakage inductor current value) Low (primary side turn off decided by magnetizing inductor current, secondary side turn off is zero due to ZCS)
Total losses Low Higher Medium Low
Control complexity Moderate Very simple Simple to complex Moderate
Wide Battery Voltage, Fixed Bus Voltage No, needs additional DC/DC stage Yes (with reduced efficiency) Yes (with reduced efficiency) Limited range
Paralleling Modules Intensive Easy Easy Intensive
Switching Frequency Fixed/ High (Si /SiC) High High Very High