Secondary-side control of a constant frequency series resonant converter using dual-edge PWM

48V Voltage regulators (VR) can be used to improve the system efficiency of telecom and data centres by eliminating a converter stage in intermediate bus architectures. Small size and improved transient performance can be achieved through high switching frequency if resonant converters are adopted for these applications. This work proposes the use of a dual-edge PWM controller on the secondary-side of a series resonant converter to remove the opto-coupler from the feedback loop, and allow the achievement of fast dynamic performance. Simulation results of a 4MHz 48V/1.2V, 25A example highlight the fast load transient results achievable with standard linear control.