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DC-link capacitors are usually utilized in voltage source converters to stabilize the DC-link voltage and suppress the transmission of current harmonics into the power grid. To guarantee the reliability of voltage source converters, in addition to select the DC-link capacitors with optimum capacitance, appropriate rated voltage and enough ripple current capacity, thermal design is also of great importance...
The multilevel converter is a prospective topology for both Medium Voltage and High Voltage Direct Current (HVDC) applications. In high power application, the forward topology is applied to increase the power region. In this paper, a novel forward-mode five-level inverter is presented which combines the features of the conventional multilevel converters and forward topology. The converters can transfer...
With the continuous development of high frequency inverter technology and multilevel inverter technology, all kinds of novel high frequency multilevel inverter are put forward and studied. And among them, the interleaved flyback three-level inverter (IFTLI) has a better work performance. In this paper, the control methods of single-phase IFTLI will be studied in-depth. Firstly, the instantaneous voltage...
DC capacitor voltage imbalance is an inherent problem limited the further development of multi-level Neutral Point Clamped (NPC). In this paper, a new hybrid control method based on Space Vector Pulse Width Modulation (SVPWM) for five-level NPC at high modulation index and high power factor is presented. By choosing appropriate switching pattern in lower modulation index sectors and collocating different...
The main function of the DC-link decoupling capacitors, integrated between the voltage source and the power devices, is to suppress the effect of the parasitic inductors and minimize the voltage overshoot. Besides, decoupling capacitors can also affect the electromagnetic interference frequency spectra. In this paper, the elïects of decoupling capacitors are explained from the time-domain and the...
With the development of power electronics technology, the three-level converter has been proposed with the low switch voltage and low output voltage harmonics. Multilevel AC - AC converter circuit topology has many advantages and has been used extensively in high output voltage field. This paper deals with the study of a thin multi-level AC-AC converter, the operating and control scheme are analyzed...
A novel three-level buck-boost type inverter is proposed in this paper. It combines the series-parallel diode-capacitor network with the traditional buck-boost converter, plus the full bridge inverter as the back stage. The new inverter can boost or lower the input voltage. The operation principle of the inverter is investigated, theoretical waveforms are shown, relevant formulas are deducted. The...
There are many researches on Z-source/Quasi-Z-source inverters since the topology was proposed in 2002 by Professor F.Z. Peng. This inverter can cover the shortage of traditional inverters. Almost all of the researches are studied in a circuit structure of single-stage. The original Z-source/Quasi-Z-source cannot achieve electrical isolation between input and output. The high frequency transformer...
This paper proposes a novel family of cascade three-level (TL) ac–ac direct converters based on ac switch cells, which transfer unsteady high ac voltage with distortion into regulated sinusoidal voltage with low total harmonic distortion (THD). The topological family includes buck TL–boost, buck–boost TL, and buck TL–boost TL modes. In order to achieve a reliable TL ac–ac conversion, a double transient...
This article is based on the needs of photovoltaic solar energy generation. A new type of multilevel DC chopper with a small bulk is researched. We analyzed three-level Boost circuit, found a kind of power supply module and gave a new family of multilevel converter topology. Four-level Boost circuit has been detailed analysis. Theoretically we analyzed its work and the four levels appear rear the...
This paper proposes a new isolated Three-Level(TL) DC-DC converter. The isolated Sepic TL DC-DC converter is based on the conventional Sepic converter. In this new converter the voltage stress of the switch is reduced to a half and the filter inductor is also significantly reduced. Its operation principle and control strategies of the converter are investigated. By modeling and simulation, the performances...
System on package (SOP) is an emerging technology, and provides an implementation options for system with small size, especially for mixed-signal systems. However, in such a compact package, noise generated by the digital chip can be easily coupled to the RF IC, and degrade the sensitivity of RF signal. In this paper, a simple and efficient multi-order lowpass filter for EMI and SSN suppression in...
Ground bounce noise (GBN) is becoming one of the major challenges for designing high speed system and packages. It causes serious signal integrity (SI) problems in the high speed system. Traditional techniques center on adding more decoupling capacitors to create a low impedance path. Electromagnetic band gap (EBG) structure is used to suppress GBN combined with decoupling capacitors in this study...
Three-level AC switch unit is produced by two-level AC switch unit connected together in series manner. Basic three-level converter is produced by applying three-level AC switch unit in basic converter. Combination mode three-level converter is obtained by combining two basic three-level converters, and it is improved into combination mode three-level converter with input and output sharing the same...
A Zeta mode three-level AC/AC converter is proposed, the converter is available in high input voltages as well as in high power applications, and it also intended for use in applications where a sinusoidal output voltage of high quality is needed. It realizes the three-level voltage waveforms before output filter, which can get a better spectrum and reduce bulk of the filter. Compared with non-isolation...
As the trend in wireless communication system is toward multi-functionality and higher miniaturization at higher frequency and lower cost, to design a RF front-end modules is a challenge. Filters, baluns, Bluetooth modules, and power amplifier modules on organic substrate have been studied widely [1-5]. Among the modules, the RF filters play a most significant role. Various design and integration...
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