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The dc-dc conversion will play an important role in multi-terminal dc networks and dc grids. This paper presents two isolated resonant modular multilevel converters (IRMMCs) to fulfill the large step-ratio conversion for medium voltage dc (MVDC) networks. The conventional resonant modular multilevel converters (RMMCs) suffer the common problems of non-isolation and high current stress, which are solved...
This paper proposes a switched capacitor based non-isolated zero voltage switching (ZVS) bi-directional dc-dc converter. By implementing a switched capacitor loop, it can provide high step up and step down gain. The converter is operated in continuous current mode (CCM) mode where all the power transistors are soft switched by means of dedicated auxiliary resonant networks. Each network consists of...
An alternative implementation of asymmetric cascaded H-bridge (ACHB) inverter is presented in this work. The presented ACHB inverter is using a single DC source. The main bridge is directly connected to the DC source (such as, battery, fuel cell or photovoltaic array). And the auxiliary bridges are fed by isolated series resonant converter (SRC). Voltage of the auxiliary bridge is balanced by controlling...
Hybrid and resonant switched-capacitor (SC) converters have the potential to achieve higher power densities than conventional dc-dc converters. This work presents an interleaved, 20 V to 120 V, resonant SC converter which could be used in applications that benefit from high power density and efficiency. The resonant topology of this SC converter enables a compact and efficient design that minimizes...
In electromagnetic resonance based wireless inductive power transfer (WIPT) system, voltage gain is determined by the coil inductances and the coupling coefficient of the power transmitting coils and frequency of operation. In this paper, voltage gain of an electromagnetic resonance based series-parallel compensated WIPT system is analyzed. Different control schemes are discussed to achieve high efficiency...
This paper presents a multi-port isolated DC-DC converter for DC applications. A three-port structure is presented, characterized with full bidirectional power flow and simple control. Galvanic isolation is achieved by means of a multi-winding medium frequency transformer which is a part of a resonant LLC converter. To provide controllable power exchange with external DC ports, two out of three ports...
This paper introduces a new modulation scheme for a Modular Multilevel Converter incorporating the selection of inter-phase module inductance chosen so its resonate frequency is sufficiently higher than both the switching and AC output frequency of the M2LC converter.
This work presents an overview of distributed submodule power electronics based on resonant and switched-capacitor topologies configured in a ladder architecture. We present a new resonant switched-capacitor topology, termed a ‘direct conversion’ topology because current flow is always uni-directional in the inductor component. The direct topology can be seen as a resonant version of the more common...
In this paper, a comparison between several induction loads operating in a One Switch - Zero Voltage Switching (1SW-ZVS) resonant converter is presented. The aim is to determine the optimal load for induction cooking systems from the point of view of maximizing the performance of a given active device (Si IGBT or SiC JFET) in this resonant topology.
This paper proposes a new method for designing high frequency switching mode resonant converters based on energy injection control instead of traditional forced switching conversion, and summarizes some basic principles for designing current-fed energy injection converters. Three example topologies of current-fed energy injection converters based on these principles are presented. In addition, two...
A high-frequency-link (HFL) micro inverter with a front-end diode clamped multi-level inverter and a grid-connected half-wave cycloconverter is proposed. The diode clamped multi-level inverter with an auxiliary capacitor is used to generate high-frequency (HF) three level quasi square-wave output and it is fed into a series resonant tank to obtain high frequency continuous sinusoidal current. The...
This paper presents a novel single stage, single phase, common ground, transformer-less inverter for PV application. The ideal gain of the inverter is minus infinity to plus infinity. Converter is derived from intelligent circuit connections of Ćuk converter and Watkins-Johnson converter. The control to output transfer function contains right half plane (RHP) zeros, which leads to a limited closed...
Time domain technique is used to analyze the LCC converter with capacitive output filter. The converter was operated with frequency control above resonance under heavy load conditions. The analysis is validated with PSPICE simulation and results from an experimental prototype.
The paper studies the possibility of driving an induction coil for induction heating without a matching transformer. The heating inductor is connected directly to the high voltage circuit. The induction heating circuit is composed of a resonant LCR circuit. The heating power could be also controlled by changing the point on the resonant current waveform the energy 'quantum' is supplied.
In applications such as large PFN chargers and power modulator power must be drawn from the 50/60/400 Hz utility grid with acceptable total harmonic distortions and without large inrush currents. A common mitigating practice is to use standard twelve or eighteen-pulse rectification circuits that require large, bulky and expensive utility power transformers and large harmonic filtering. SAIC has developed...
The next generation of wireless communication is a ubiquitous radio system concept, providing wireless access from short-range to wide-area, with one single reconfigurable and adaptive system for all envisaged radio environments. This paper presents the design approach of RCO (reconfigurable concurrent oscillator) that simultaneously generates two or more signals of different frequencies that eliminate...
This paper proposes a novel single-stage high-power-factor electronic ballast with symmetrical half-bridge topology for fluorescent lamps. The proposed electronic ballast only uses a symmetrical half-bridge topology to procure the functions of a boost power-factor-correction converter and a half-bridge series parallel-loaded inverter. In spite of its simplicity, an excellent performance concerning...
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