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This paper investigates a multilevel inverter composed of series/parallel-connected H-bridges. The presented structure can be used for applications in which is intended to use semiconductor switches with low voltage and low current rating. A comprehensive system model to control the circulating current, an overall control strategy to adjust the output voltage with constant magnitude and frequency,...
This paper presents an Integrated switched-coupled-inductor boost-flyback converter (abbreviated as SCIBFC), which has benefits of both Integrated boost-flyback converter (IBFC) and switched coupled-inductor boost converter. The principle of the proposed converter, analysis of operation (including the effects of parasitic parameters), and design guideline are included. SCIBFC achieves soft-switching...
This paper proposes a primary side control for series-series compensated wireless power transfer system. By eliminating the need for a communication link for signal feedback, the control method not only reduces volume and cost of the system, but also improves a dynamic response. This controller only requires the information of the primary side voltage and current to identify the load resistance and...
This paper presents a simplified direct modulation prediction approach for modular multilevel converters (MMC). By using the Euler approximation, the grid-side and circulating currents are firstly predicted to obtain the values in the next switching cycle. Then the modulations are directly calculated based on the established mathematical models for the six-arms of MMC. Subsequently, the capacitor...
Ultra-high speed machines have become more and more interesting to researchers in the past few decades. Switched reluctance machines (SRMs) are very attractive to researchers due to their simple geometry. However, traditional control methods are not suitable for ultra-high speed applications because of their super-high switching frequency. In this paper, a constant volts per hertz control for ultra-high...
A simple on-line auto-tuning technique for a resonant converter to achieve output voltage regulation while tuning the switching frequency to the resonant frequency is proposed in this paper. The proposed method can deal with resonant frequency variation caused by the resonant components tolerance and variation. The proposed technique is developed by detecting the zero-crossing point and peak point...
Due to the structural design of the traditional matrix converter, the voltage transfer ratio is limited to 0.866. In this paper, we purposed a new one-step boost type matrix converter, which can change the voltage transfer ratio variable from the perspective of changing the topological structure. The topological structure of one-step boost type matrix converter not only improved the voltage transfer...
In this paper different gate drive concepts to eliminate parasitic turn-on for SiC MOSFETs are discussed. Experimental results show a potential for lowering switching losses of SiC MOSFETs during fast switching operation, reduction of turn-off overvoltage across the bodydiode. Finally increased requirement on the gate drive unit are discussed.
With the development of more/all electric aircrafts, variable frequency AC (VFAC) generation systems become popular. Dual stator-winding induction generators (DWIG) utilized in VFAC systems have the feature of the high fundamental frequency. However, the switching frequency of high power devices does not exceed 5 kHz in general, which makes carrier ratio lower. Thus, how to ensure the quality of the...
This paper presents a control technique for ultra-high switching frequency rectifiers known as virtual flux-based direct power control (VF-DPC). This method utilizes AC voltage sensors to provide better power quality at the input and output of power converters. Performance of an ultra-high switching frequency converter using the extended and conventional VF-DPC method is analyzed. The analysis has...
In high voltage (HV) flyback charging circuits, the importance of transformer parasitics holds a significant part in the overall system parasitics. The resonance between magnetising inductance and resonant capacitance cause significant deviations in voltage gain. This effect is predominant in the case of very lightly loaded high voltage flyback converters when used for bipolar output voltages. In...
This paper presents a division-summation (D-Σ) digital controlled three-phase four-leg voltage source inverter with load impedance estimation for uninterruptible power supply applications. The D-Σ digital control developed for current tracking can accommodate wide filter inductance variation, which has been successfully adopted in grid-tied applications. This paper proposes a load impedance estimation...
This paper presents a hybrid parallel DC/DC converter to have the advantages of wider zero-voltage switching range, less primary circulating current and higher circuit efficiency. The proposed converter incudes two parallel full-bridge circuits shared the same lagging-leg switches to reduce the switch counts and current stresses of passive components on the secondary side. Half-bridge circuit is connected...
In this paper, the bidirectional charger/discharger is developed on T-S fuzzy models. The circuit topology is constituted by Buck and Boost converters. The non-ideal element model is considered in the circuit. First, the state space average method is adopted to obtain the state equations of the bidirectional charger/discharger. Next, the output voltage controller is designed based on T-S fuzzy models...
A novel start-up method for an isolated full-bridge boost converter with modified phase-shift technique, for RES and automotive applications is proposed. In order to avoid the high inrush currents, the converter is operated in flyback mode at start-up. For precharging the output capacitor no auxiliary circuits or modified switching strategy is necessary. All the power switches of the isolated boost...
This paper proposes a new cooperative-control strategy for a 400-W class light-emitting diode (LED) driver consisting of two DC/DC converters operating in the discontinuous current mode (DCM). In the cooperative control method, one DC/DC converter is selected to supply the output current for the LED, based on the reference value of the LED current. Thus, the proposed cooperative-control strategy achieves...
A multiport current-fed boost dc-dc converter with zero-current switching (ZCS) is proposed in this paper. The proposed converter integrates two different voltage sources, regulates the output voltage for load as well as input voltage variations. Zero-current switching achieved in the active switches by utilizing the resonant tank circuit with proposed modulation scheme. Throughout the operation,...
This paper presents a method of controlling switched reluctance generators (SRG) for maximum efficiency where the SRG operates in single pulse mode. The analysis and modeling of experiment data showed that the optimal-efficiency turn-on angle can be characterized as a function of output power and speed. Thus the maximum efficiency is achieved where the turn-on angle is fixed at optimum value and the...
Conventional PFC circuits in EV (Electric Vehicle) battery chargers have the efficiency limitation due to high conduction loss associated with a diode bridge rectifier (DBR) at the input. To mitigate this issue, a bridgeless single ended primary inductance converter (SEPIC) with improved power quality is presented in this paper. The input current drawn by the charger shows a unity power factor operation...
High voltage gain DC-DC converters as used in photovoltaic, fuel cells and other low-voltage distributed generation system have played a significant role in the large-scale promotion of new energy generation. A high step-up integrated DC-DC converter based on one active switch is proposed in this paper by making use of advantages of the quadratic Boost converter (QBC) and the voltage multiplying modular...
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