Influence of the junction capacitance of the secondary rectifier diodes on output characteristics in multi-resonant converters

Abstract

Multi-resonant converters like the CLLLC topology are known for their outstanding efficiency and high power density. Little information has however been published about the influences of secondary side diode junction capacitances on the output characteristics of the resonant converter. This paper presents a detailed analysis of these influences in the inductive working range and reviews practical design considerations of the converter. Therefore, experimental results of an inductive power transfer system, using a CLLLC resonant topology, are compared to theoretical time domain solution, showing significant effects of different semiconductor materials and devices on output power. These effects will be discussed and explained in detail by using measured key waveforms

A Resonant Push–Pull DC–DC Converter With an Intrinsic Current Source Behavior for Radio Frequency Power Conversion

“…Since the junction capacitance of the diodes must be recharged each time the rectifier is switched, additional operation modes occur, in which all rectifier diodes are in blocking state. As reported for other topologies of resonant dc-dc converters, the resulting deviation of the mode sequence from idealized considerations can have a remarkable impact on the output power, which also should be investigated during converter design [48].…”

Asymmetric Resonant Tank Design for a Bidirectional CLLC Resonant Converter in G2V and V2G Operation

“…On the secondary side, we simplify the inverter, which is responsible for the synchronous rectification, to a passive full-bridge rectifier using ideal diodes. Although it was shown in [21] that the output capacitances of the secondary-side rectifier diodes have an influence on the behavior of the CLLC resonant converter, these capacitances are not considered in the model in order to reduce the number of parameters and thus the required number of circuit simulations.…”

A High-Efficiency High-Power-Density SiC-Based Portable Charger for Electric Vehicles

“…This ensures that the drainsource voltage v DS across the primary switches has dropped to zero before the resonant current i prim reaches a positive value, providing the condition for ZVS. Detailed operation principles, detailed analysis considering the operating modes, and methods for voltage regulation of the LLC resonant converter can be found in [59][60][61].…”

“…known from the fundamental harmonic analysis (FHA), and is used to calculate L res and C res [47,63]. However, the FHA does not consider parasitic components (output and junction capacitances) and non-ideal control signals (dead time), which leads to inaccurate results [60]. In order to consider the influence of nonlinear capacitances and dead time on the output power and the ZVS condition, the parameters L res and L m are analyzed with a simulative approach.…”