Current driven synchronous rectifier with saturable current transformer and dynamice gate voltage control for LLC resonant converter

Analysis of the time‐domain model of the LLC series resonant converter with frequency and single phase shifted control

“…With simplification, the analytical solution for the resonant current and resonant capacitor voltage can be given in (6) to (9), where the characteristic impedance R o and the natural resonant angular frequency w r are respectively defined in (10) and (11).…”

“…The current-detecting method relies on the auxiliary current-detecting circuit. For example, the current zero-crossing point can be detected by a current transformer (CT) [10][11][12], or by the self-driven chip which detects the Metal-Oxide-SemiconductorField-Effect Transistor (MOSFET) drain-source voltage to distinguish the current zero-crossing point [13][14][15][16]. However, these auxiliary circuits increase the cost and the volume, as well as the control complexity.…”

Synchronous rectifier driving circuit based on voltage‐driven method with energy recovery

“…The control-driven method develops driving signal by monitoring the SR current [17][18][19][20][21][22][23][24][25][26][27][28]. Depending on how the current is monitored, this technique divides into currentdriven and voltage-driven methods.…”

“…Depending on how the current is monitored, this technique divides into currentdriven and voltage-driven methods. In the current-driven method, the current transformer (CT) is placed in series with www.ietdl.org MOSFET to sense the SR current [18][19][20][21][22][23][24][25][26]. However, CT has a large size and its winding adds resistance to the current path.…”