ZVS phase shift full bridge converter with controlled leakage inductance of transformer

Hybrid phase shifted full bridge and LLC half bridge DC–DC converter for low‐voltage and high‐current output applications

“…To achieve soft switching for lagging leg switches, many solutions have been provided in the literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. The solutions can be classified into two categories: one is ZVS for leading leg switches and zero current switching (ZCS) for lagging leg switches [1][2][3][4][5][6].…”

“…Other solutions are proposed to achieve ZVS for all the four switches [7][8][9][10][11][12][13][14][15][16][17][18][19][20]. A saturable inductor is introduced into the primary winding of transformer to extend ZVS range without significantly increasing duty cycle loss [7].…”

“…However, it is difficult to be implemented for its non‐linearity. A ZVS PSFB converter with controlled leakage inductance of transformer is proposed [8], the additional leakage inductor shares the same ferrite core with transformer, and thus the core loss is reduced. A two‐inductor rectifier is used in secondary side of transformer to achieve ZVS under light loads [9].…”

Achieving the desired transformer leakage inductance necessary in DC-DC converters for energy storage applications

“…Adding a separate inductor in series with the transformer to achieve the desired value of the inductance increases overall size, cost and losses of the system. A more elegant alternative is to modify the transformer design to integrate the desired leakage inductance [11]. The design of the medium frequency transformer with a specific value of leakage inductance for a DC/DC converter is crucial for optimizing the overall cost (no extra inductance required) and operating efficiency of the system and to achieve a reasonable controllability of the power flow.…”