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The light-emitting diode (LED) technology is reaching a high penetration in commercial applications oriented to illumination. However, there are some problems associated when the application requires a high output power. The problems are related to the connection of several LED units to reach the voltage and current levels. The voltage-current characteristic of the LEDs is not always the same, specially...
The growing number of distributed energy resources, DC loads and energy storage systems drive the adoption of DC distribution networks. This paper in particular addresses three-wire bipolar DC distribution networks (b-DCDN), that provide two voltage levels to connect low- and high-power loads, while transferring twice the amount of power with less conduction losses as compared to the two-wire unipolar...
This works presents the design and test of a switching power supply intended for powering LED tail lights in automotive applications. The design is proposed as an alternative to an existing Boost reference design, and is based on a different step-up topology, the ZetaBoost, with the objective of reducing the output ripple, and therefore ease the compliance with automotive electromagnetic interference...
DC-DC converters are used as secondary power sources. There are many different topologies of such converters, each of which has its own advantages and disadvantages. It is also possible to combine them in order to ensure a more reliable power supply. This paper presents the new scheme of multiple port DC-DC converter and its simulation results in three operating modes.
The photovoltaic (PV) grid-connected power system in the residential applications is becoming a fast growing segment due to the shortage of the fossil fuel energy and the great environmental pollution. A new research trend in the residential generation system is to employ the PV parallel connected configuration rather than the series-connected configuration to satisfy the safety requirements and to...
This paper describes topology and control algorithm of a bidirectional isolated converter with controlled semiconductors at the voltage-fed and current-fed parts. A bidirectional switch connected in series with the transformer winding at the current-fed side features zero-current switching and allows achieving zero-voltage-switching of transistors at the voltage-fed side by utilising leakage inductance...
In this paper, a combined control strategy based on Model Predictive Control(MPC) and Extended State Observer(ESO) is proposed to solve the output fluctuation problem caused by the variation of load resistance and input voltage. The optimal control strategy means that Model Predictive Controller is used as the main controller. The Extended state observer is used to observe the disturbance from a variety...
In conventional photovoltaic microinverters configuration, a single PV module is connected to the grid through two converter stages: a step-up dc-dc stage and a step-down dc-ac stage. In the first stage, a high frequency transformer is generally used to achieve the high step-up voltage ratio conversion to a voltage above the grid peak value, reducing the converter efficiency while increasing its size...
This work is mainly dedicated to implementation of bidirectional DC-DC converter for DC storage systems in medium power Microgrid applications. Microgrids are gaining immense popularity in present day scenario due to availability of flexible power management strategies and cost effectiveness. DC Microgrid mainly consists of PV system and Battery system. Battery system plays very important role in...
In the present trend the Renewable Energy Sources (RES) are the main alternative concept to develop the power generation and it is cheap compared to other sources. The RES (Renewable Energy Sources) like solar energy, wind energy, geothermal energy, biomass, tidal power etc., and here among all these sources of energy solar module is developed with two individual boosts converters are utilized to...
This paper presents an isolated three-port ac-dc converter with vehicle-to-grid (V2G) reactive power capability. Port 1 of the proposed converter is interfaced with AC through a matrix converter while Port 2 and Port 3 are connected respectively to supercapacitor (SC) and battery. The SC can be charged by receiving active power from the AC grid, and can also provide reactive power to the AC grid when...
The number of mobile device users increases every year. Each mobile device is usually equipped with a Li-ion battery having voltage that varies from a minimum of 2.7V to a maximum of 4.2V. Therefore, as the battery voltage decreases with time, a DC-DC converter is required for a regulated supply lower or higher than the battery voltage. A simple buck converter is not suited for this case, since step-up...
Energy harvesting (EH) is a topic of intensive research promising battery-free operation of massive networks of wireless IoT devices. To simultaneously satisfy the EH and IoT, ultra-low-power (ULP) consumption with ultra-low-voltage (ULV) supply are required. Some, e.g., photovoltaic, EH output voltage (<0.3V) is below the threshold voltage (Vt) of even the most recent FinFET CMOS transistors,...
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...
The high power density of Supercapacitors (SCs) make them good elements for Hybrid Energy Storage Systems (HESSs). In order to increase the amount of energy of their high power bursts, they should operate with large voltage variations. This paper presents the design equations of a 3-switch bidirectional DC-DC converter with a tapped inductor that can be used for interfacing SCs to DC buses. Some of...
Half-Bridge (HF), Full-Bridge (FB), Push-Pull (PP) types of DC-DC converter were designed and simulated in MATLab-2009a with input voltage of 12V. The Zero Current Switching technique (ZCS) at primary side, Zero Voltage Switching technique (ZVS) at secondary side of the High frequency (HF) transformer based converter were used in these topologies. The performance analysis and comparison between HF,...
Novel dc-dc converters with a single input and multiple outputs has been proposed in this paper. The features of the proposed topology are (a) reduced part count leading to compact and lightweight circuit, (c) high voltage gain, (d) single input double output, (e) low ripple in the input as well as output side, and (f) a minimal number of active switches. Apart from this, the paper highlights the...
In this treatise, 4Nx hybrid Non Inverting & Non Isolated (NI-NI) DC-DC interleaved multi-level boost converter (4Nx IMBC) for renewable energy applications is proposed. The proposed 4Nx IMBC is derived by coalescing the feature of 2Nx DC-DC Interleaved Multi-level Boost Converter (2Nx IMBC), voltage-lift-switched-inductor-modified (VLSIm Cell) and Cockcroft Walton (CW) voltage multipliers. The...
In this paper, power factor corrected novel ac-dc rectifier topologies for 1-ph and 3-ph application are proposed. These converters provide high gain and do input current shaping as well. A mutual inductor is used at the ac side for providing high gain as well as current shaping. The ripple energy of the system is analyzed. The relations between the ripple energy of 1-ph and 3-ph system with power...
Applications of the multi-input converters are becoming popular due to their conformity to renewable energy systems. This paper proposes a new topology of double-input boost converters with continuous input current, which is intended to be used for renewable power sources. The topology is derived from two dc-dc converter configurations: boost dc-dc converter and Y-source dc-dc converter. In the proposed...
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