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A high-gain non-isolated DC-DC converter is proposed with a inversely coupled inductor and a voltage lift cell. Energy stored in the leakage inductance of the coupled inductor is recycled through a voltage lift cell to obtain high voltage conversion ratio. The operation of the proposed converter is explained using its equivalent circuits which are used to derive static gain expression. The operation...
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...
A modular multilevel converter (MMC) configuration is presented as a medium-voltage high-power drive for variable-speed applications incorporating symmetrical six-phase machines. The topology employs six standard MMC phase-legs feeding two isolated groups of three-phase machine windings, each with 60° spatial phase-displacement. A novel concept of ripple-power decoupling between adjacent sub-modules...
In single-phase photovoltaic (PV) systems, power mismatching between input and output terminal leads to power pulsation, seriously affecting maximum power point tracking (MPPT). Paralleling an electrolytic capacitor (e-cap) across PV panel to smooth power pulsation seems to be an unreliable method owing to its short lifetime. Various power decoupling methods used in micro-inverters have been proposed...
In this paper, a novel bridgeless Flyback power factor correction rectifier is presented. Two active power switches, rather than the line-voltage diode bridge, are used to provide the bidirectional power flow. In comparison with the existing Flyback rectifiers, the proposed topology uses less number of transformer windings which simplifies the complexity of implementation in terms of magnetic utilization...
Super capacitor energy storage system(SCESS) with high power, long life, wide operating temperature range, is widely used in industrial applications. The balancing system is needed to ensure the operation safety of the SCESS. In this paper, the balancing system based on active clamped forward converter is designed. The active clamped forward converter is based on synchronous rectifier technology with...
This paper presents a novel structure of high step-up DC/DC converters intended for distributed generation systems such as fuel cells and photovoltaic (PV) systems. Proposed topologies integrate the classical Y-source impedance network with different step-up cells to acquire strong boost ability which is unmatched by existing impedance networks. Compared to Y-source, proposed converters reserve versatile...
In this paper, selection of optimum DC link capacitor for Integrated Modular Motor Drives (IMMD) is presented. First, a review of IMMD technologies is given and current research and future prospects are studied. Inverter topologies and gate drive techniques are evaluated in terms of DC link performance. The urge for volume reduction in IMMD poses a challenge for the selection of optimum DC link capacitor...
This paper presents two configurations of dual-input (DI) or three-port (TPC) isolated dc-dc converters for hybrid renewable energy systems such as photovoltaics and batteries. These two converters are derived by integrating an interleaved boost converter and a single-active bridge converter with an ac inductor as a power interfacing element or phase-shift soft-switching converter with an output dc...
A family of DC/DC step-down converters with quadratic voltage transformation rate with only one low-side active switch is presented. The most promising topology using coupled inductors with pronounced step-down ratio is analyzed in detail. The circuit is especially useful for higher input voltages when diodes are used, which have lower losses than the active switch. The current and voltage waveforms...
Galvanically isolated impedance-source (IS) dc-dc converters are a high performance solution proven for emerging power electronics applications. However, studies of their bidirectional operation have been scarce. Focus in this paper is on the reverse power transfer possibilities of the high performance quasi-Z-source (qZS) series resonant dc-dc converter. This enables extension of functionality and...
This paper presents an optimum solution for field deployment for off-grid renewable energy based single phase power generation using a 3-phase self excited induction generator (SEIG). While several topologies of 3-phase SEIG to feed single phase loads are discussed in the literature, it is essential to study all possible configurations to arrive at best possible solution for given application, to...
Due to the flybacks' indirect characteristic of energy transfer, the transformer size increases for high power levels. Providing an additional direct energy transfer path can decrease its size. Parallel forward-flyback converters offer such functionality and outperform forward converters with regard to PFC functionality. A balanced forward-flyback converter is a variation on this kind of parallel...
Presently, most of the commercial and industrial sectors are using PV system because of its advantages towards clean and green energy. Subsequently, it is not an ideal power source as it solely depends upon sun light. In the recent past, a lot of research and development has been carried out to enhance the reliability, efficiency and cost effectiveness of power electronics converters in order to increase...
A Sepic converter for high power and the high gain application has been proposed in this paper. Generally, due to magnetic limitation, a single Flyback transformer cannot handle high power. Hence, for relatively higher power applications, people prefer the use of interleaved Flyback converter structures. But the interleaved Flyback converter requires the use of two switches. The interesting feature...
The interleaved multilevel DC-DC converters have advantages of low voltage stress of the switches and diodes and reduction of filter size. Particularly series input parallel output (ISOP) configuration is well suited for high output voltage and large output current application but input series output series (ISOS) configuration enable the utilization of low voltage rating switches in high voltage...
Inductive power transfer (IPT) is widely used for the contactless charging system. In an underwater environment, it's also a feasible way to the underwater vehicles for battery charging. In this paper, a novel design process of IPT system is implemented. Serial-serial (SS) topology is selected for the application due to the constant output voltage in a non-resonant state even with a various load....
This work investigates design optimisation and design trade-offs for multi-kW DC-DC Interleaved Boost Converters (IBC). A general optimisation procedure for weight minimisation is presented, and the trade-offs between the key design variables (e.g. switching frequency, topology) and performance metrics (e.g. power density, efficiency) are explored. It is shown that the optimal selection of components,...
The paper presents new topology for flyback converter which can be used for various applications. Generally in a flyback converter there is one primary winding and other secondary winding. But new topology deals with the introduction of tertiary winding which would create multiple outputs on secondary side. On one side there will be traditional DC output and on the other side there will be AC output...
This paper presents a novel inverter topology based on conventional Z-Source Inverter and Switched Capacitor DC-DC converter. Compare to other conventional topologies the proposed topology gives more boosting factor. Further the input current is continuous. In renewable energy conversion system, it is desirable to get high step up output voltage from a low input voltage source. The proposed topology...
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