Topology description

AN2626

4/13

1

Topology description

The basic circuit of the phase-shifted converter is composed by four switches; two for each

"leg".

The switches, labeled Q1 through Q4 in the Figure 1 are shunted by their intrinsic body

diode (D1 through D4) and intrinsic output capacitance (C1 through C4), shown separately

in order to clarify their role in the global functioning.

Figure 1.

Phase-shifted ZVS full bridge circuit

Figure 2.

Switching sequence in a P-S ZVS FB converter DC/DC

Q1

Q2

Q3

Q4

Vgate

t

Q1

Q2

Q3

Q4

Vgate

t