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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...
A circuit topology of the forward-mode three-level inverter is proposed. The kind of circuit topologies are constituted of three-level converter, high frequency transformer, output cycloconverter, output filter and so on. The inverter has the advantages such as simple topology, two-stage power conversions(DC/HFAC/LFAC), bidirectional power flow, high frequency electrical isolation, three-level voltage...
A Zeta mode three-level AC/AC converter proposed utilizes three-level voltage in one switching period before output filter to form output sinusoid voltage, which can get a better spectrum and reduce bulk of the filter. The frequency of harmonics depends on switching period, so it can be filtered easily when the converter operates in high frequency. Compared with Two-level ac chopper, the amplitude...
Recently AC voltage regulators, which adopt the method of AC-DC-AC transformation, not only have the problems of big bulk and high noise, but also with high voltage switch stress and harmonic interferences. To solve these problems, a new kind of high frequency isolated three-level AC-AC direct converter is proposed, operational principle, frequency structure of the voltage in front of the output filter...
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...
In order to solve the problems existed in the field of high power applications such as voltage stresses and harmonic interferences of the two-level AC / AC converter, a new kind of high frequency isolated half-bridge three-level AC / AC direct converter is proposed, which can convert one alternating voltage with instability distortion to another regulated constant frequency sinusoidal voltage. The...
A novel push-pull three-level isolated DC-DC boost converter is invented. The new circuit topology is proposed based on the push-pull three-level converter. The idea of symmetry is applied into the invention of the new topology. This paper describes the basic circuit and the operating principle for the new circuit. Besides, some theoretical idealized waveforms are given, relevant formulas are derived,...
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...
Zeta mode three-level AC/AC converter can realize three-level voltage before output filter, which can get a better spectrum and reduce bulk of the filter. Compared with non-isolation and low or middle frequency isolation AC/DC/AC converters, it is single stage. And compared with Buck non-isolation AC/AC converter which can only realize buck output voltage, it can realize buck and boost output voltage...
A circuit topology of the push-pull three-level AC/AC converter with high frequency link is firstly proposed. The circuit topology of this converter is constituted of multilevel converter, high frequency transformer, output cyclic converter. The three-level push-pull AC/AC converter have the advantages such as simple topology, two stage power conversions, bidirectional power flow , high frequency...
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...
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