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The magnetic coupling of filter inductors is widely utilized in various power electronics application fields including dc-dc converters in EV charger system in order to enhance the filtering performance while maintaining the minimal filter size. The optimal distribution of self and mutual inductance of coupled inductor is regarded to be one of important design tasks with respect to the coupled inductor...
In high voltage gain application scenarios, diode-capacitor network can be used to achieve a relatively high voltage gain and at the same time reduce the demand of magnetic component, which considerably improves the efficiency and power density. In this article, the topology of a high step-up DC-DC converter based on multi-cell diode-capacitor network and coupling inductor is proposed to attain a...
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...
Isolated dc-dc converters are increasingly being used in many industrial and utility applications such as shipboard, hybrid and electric vehicles, microgrids, etc., for integrating the dc sources and storage devices. A modified dual transformer based asymmetrical dual bridged isolated dc-dc (MDT-ADB) converter is proposed in this paper. MDT-ADB consists of three stages: input, isolation, and output...
A novel quadratic boost A-source impedance network is proposed to realize converters that demand very high voltage gain. To satisfy the requirement, the network uses an autotransformer where the obtained gain is quadratically dependent on the duty ratio and is unmatched by any existing impedance source networks and normal dc-dc converters with coupled magnetics at the same duty ratio and turns ratio...
A novel A-source impedance network is proposed in this paper using an autotransformer for realizing converters that demand a very high dc voltage gain. The network utilizes a minimal turns ratio compared to other Magnetically Coupled Impedance Source (MCIS) networks to attain high voltage gain. In addition, the proposed converter draws a continuous current from the source, and hence it is suitable...
Focus is on a transformer based single-switch galvanically isolated quasi-Z-source converter. Single-switch topologies suit well for low power applications due to low complexity and cost of realization. However, their performance is rather limited, since only one switch should handle all converter power. Input-parallel output-series (IPOS) cascading improves stress of semiconductor devices, reliability,...
This paper introduces a new single-switch nonisolated dc-dc converter with very high voltage transfer ratio and reduced semiconductor voltage stress. The converter utilizes an integrated autotransformer and a coupled inductor on the same core to achieve a high step-up voltage gain without extreme duty cycle. Further, an integrated passive regenerative circuit recycles the leakage energy of the coupled...
The boost dc-dc converters are used to increase the magnitude of dc voltage. The renewable energy sources such as photovoltaic and fuel cell generate low magnitudes of voltage. To solve this problem, it is necessary to use a boost dc/dc converter. In this paper, a new boost dc-dc converter by using coupled inductor is proposed. In the proposed converter, by choosing the sutitable value of the coupled...
A novel high step-up high efficiency dc-dc converter for photovoltaic energy conversion is presented in this paper. The proposed converter employs a coupled inductor and two voltage multiplier cells to achieve high step-up voltage gain. The operating principle and the steady-state analyses of voltage gain are described in detail. A 200 W prototype with 20–30 V input and 400 V output voltages is built...
High boost DC-DC converters find wide variety of application in industry such as solar photovoltaic systems, fuel cell systems, UPS, micro-grids to name a few. Low component count, continuous input current, high boost operation at non-extreme duty ratio, etc. are some of the desirable features of a high gain DC-DC converter. In this paper two coupled inductor based novel high gain DC-DC converters...
In this paper, a novel high step-up converter with coupled inductor boost converter is proposed. The circuit topology of the proposed converter is derived from conventional boost converter with coupled inductor connection such that high step-up voltage gain with proper duty ratio is achieved. Besides, the coupled-inductor technique concept also can be adopted to construct other step-up converters...
This paper presents a novel quasi-Z-source half-bridge DC-DC converter family derived by a combination of the single-switch qZS DC-DC converter and the half-bridge galvanically isolated DC-DC converter. The novel topologies have only two active switches and are a cheaper alternative to the galvanically isolated quasi-Z-source DC-DC converters with a full-bridge switching stage. Such promising features...
Design and fabrication of a Dual input — Single output DC-DC converter topology is reported in this paper. Nowadays renewable energy sources are enormously utilized for electrification by the domestic consumers. These renewable energy sources require a proper power converter circuit for the integration with grid or to operate in the off grid. Single Input — Single Output (SISO) converters are used...
Two variants of the full soft-switching high step-up DC-DC converter are proposed. The main advantage of the converters is the minimized conduction losses by the use of the four-quadrant switches and a specific control algorithm. Simulation was performed to verify the principle of operation and to estimate the losses.
A novel galvanically isolated quasi-Z-source DC-DC converter with a single switch is presented. It is derived from the conventional single-switch nonisolated quasi-Z-source DC-DC converter. The new topology is within the transformer based class of the galvanically isolated impedance-source DC-DC converters, while existing topologies are solely within the coupled inductor based class. This simple solution...
This paper presents a novel class of quasi-Z-source galvanically isolated DC-DC converters intended for the integration of low voltage renewable energy sources into a DC microgrid. These converters combine characteristics of the transformer based and the inductor based impedance-source galvanically isolated DC-DC converters. They feature the continuous input current essential for photovoltaic applications...
This paper proposes a novel high gain DC-DC converter, the core structure of the circuit is a bridge which is composed of two power switches and two equivalent voltage sources. The two equivalent voltage sources are charged in parallel during the two switches turn on and are discharged in series during the two switches turn off, which makes the converter produce high output voltage to realize high...
In an isolated power supply, the inter-winding parasitic capacitance plays a vital role in the mitigation of common mode noise currents created by fast voltage transient responses. The lower the transformer inter-winding capacitance, the more immune the power supply is to fast voltage transient responses. This requirement is even more critical for modular stacking applications in which multiple power...
DC distribution main consist of power electronics components and converter. Energy storage system is also required to maintain the voltage stable for DC bus. This paper discusses the structure of a hybrid energy storage system (HESS) of battery and ultracapacitor. A new bidirectional DC-DC buck/boost converter used for energy transfer between DC bus and HESS is also analyzed in detail. It not only...
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