A resonant inductance embedded transformer is a critical component of the LLC resonant converter, as it provides the required isolation between the primary and secondary sides and makes up a large portion of the total converter volume. This paper presents a comprehensive design procedure for a 100kHz, medium-voltage transformer to be used in a 30kW Serial Half Bridge converter with 45kW overload condition. Parallel windings are used to allow for high-current high- frequency applications and current sharing is analyzed. Also, a method for leakage inductance integration is also discussed in this paper.

This digest proposes an alternative TCM approach, where the positive and negative envelopes of the inductor current are captured using a simple analog maximum and minimum quasi-peak detector. The current envelope can be sampled with a low sampling rate and used to assure TCM with ZVS. Advantageously, the same control loop can also enable continuous conduction mode operation.

This paper introduces a model reference adaptive control (MRAC) method based on neutral network approximation for dual active bridge (DAB) dc-dc converter. The nonlinear models of the DAB converter are developed for single phase shift (SPS), dual phase shift (DPS), and triple phase shift (TPS) modulation using the harmonic approximation of the switching waveforms. Then, neural network-based adaptive laws and control laws are established which can provide robust control performance and deal with uncertainties of the system. The control method is simulated in Matlab/Simulink and the simulation results demonstrate that the controller tracks the reference voltage effectively while rejecting the disturbance from the source and load side within a very short time.

This digest proposes a novel three-port hybrid bridge based bidirectional series-resonant converter with a corresponding modulation strategy. With a three-level (TL) full-bridge and two two-level full-bridge, the proposed converter can be utilized for interfacing the medium voltage and low voltage DC grids. Comparing with the conventional three-port converter (TPC) with pulse-width modulation (PWM) or phase-shift control, the proposed converter has two operation modes, which can satisfy the wide voltage conversion gain.