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The interleaving technique is necessary for multiphase LLC resonant converters in high output current high power level applications. But the conventional frequency-controlled LLC converters will lose current sharing if all the phases are operating at the same switching frequency. In this paper, a two-phase interleaved LLC-Regulated DCX (LLC-RDCX) with parallel PWM output regulation is presented to...
In this paper, a high voltage SiC MOSFET module with series-parallel hybrid topology is presented and analyzed. The module consists of two uniform parts in parallel and each of the part includes three sub-parts in series. The sub-part contains three primary parts connected in string where each of these parts has a parallel of two SiC MOSFETs. These SiC MOSFETs are divided into six sub-modules, which...
This paper carefully discusses the interaction between the bus capacitors and the parasitic inductances in an integrated DC-DC converter module. The design principles of the bus capacitors are presented and validated by simulation results. In addition, an optimized PCB layout with split bus capacitors is proposed for enhancement-mode Gallium-Nitride (eGaN) transistors based integrated DC-DC power...
This paper presents an analysis and comparison of magnetics structures in a tapped boost converter for LED applications. The magnetic structure is a coupled inductor which is analyzed in a conventional wire-wound core as well as in a planar structure for different interleaving winding arrangements. The analysis is performed in terms of leakage inductance, winding capacitance and winding loss. Efficiency...
Active power decoupling techniques are promising solutions for capacitance reduction in single-phase AC/DC or DC/AC systems. This paper proposes a novel circuit topology which can realize the power decoupling function without adding additional active switches into the circuit. Also, the proposed topology does not require additional passive component, e.g. inductors or film capacitors for ripple energy...
This paper introduces the multifunctional circuit which is called as active DC-link circuit (ADLC) in single-phase diode rectifier system without electrolytic capacitor. This circuit is located to DC-link node in parallel and shows many performances such as energy buffer for decoupling ripple power and power factor correction (PFC) by controlling instantaneous system power. Therefore the diode rectifier...
Traditional LED drivers generally use electrolytic capacitor as the storage element which will restrict the lifetime and power density of drivers. In this paper, an electrolytic capacitor-less LED driver which pluses an auxiliary winding in the transformer and an additional full-bridge circuit to Flyback converter is proposed. It not only eliminates the electrolytic capacitor to extend the lifetime,...
This paper addresses the optimal design of leakage inductance of the high-frequency transformer in dual active bidirectional converter stages of cascaded bidirectional converters. By the analyzing realization condition of zero-voltage-switching and the method to reduce reactive power under controlling of single phase shifting control strategy, the optimized circuit parameters are selected. An experimental...
For a constant on time controller to be stable with all ceramic output capacitance, a virtual ESR (Equivalent Series Resistance) circuit is needed to inject the required ripple voltage into the FB (Feedback) node. This paper proposes a new stability criterion, which is that the FB node ripple voltage need to have the same phase as the inductor current and have certain amplitude to filter out noise...
A parallel-serial dual active bridge (PSDAB) circuit is presented in the paper to improve the efficiency under the circumstances of high-voltage ratio transformation. The proposed PSDAB circuit is constructed by the paralleled low-voltage terminals of the two dual active bridges (DABs) and the serial high-voltage terminals of the DABs. Just like the DAB circuit, the zero voltage switching (ZVS) is...
In the very recent years, the modular multilevel converter (MMC) topology has become the development trend of high-voltage high-power power conversion technologies. However, one specific issue associated with MMC is the necessity of very large capacitances, which stops it from reducing cost, increasing reliability, and improving power density. To reduce the capacitance of required capacitors, in this...
AC motor-driven electric scooter in addition to mini-EV which are highly eco-efficient, high performance, more convenient, and air-pollution free are to offer a certain powerful solution to global environmental problem. This paper presents a newly-developed super-quick charging power electric motor-driven scooter (Electric Scooter) incorporating EDLC stack useful for a low carbon society. Described...
The research on variable frequency system mainly focuses on the developing of system performance, while the negative effects of the system is ignored. The bearing currents issue is a typical negative effect. In this paper, a lumped common mode model of a variable frequency induction motor driven by PWM inverter is proposed and the formulas of the key parameters in the model are presented and impedance...
A novel topology of half bridge three-level full bridge bidirectional DC-DC converter is proposed. The configuration and operational principles of the novel converters with the dual-phase-shifting control were analyzed. The ZVS soft-switching range of the left three-level half bridge and the right H-bridge under different voltage conversion ratio were discussed. In order to improve the whole system...
In order to solve the problem of poor re-producibility and large particles in pulse bias arc ion plating (AIP), this paper proposes an incremental fuzzy control scheme based on the extended state observer (ESO) for DC/DC converter. According to researches about equivalent load model of pulse bias AIP in the vacuum environment, the relationship between the influence factors on load and output performance...
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