The rise of green technologies in transportation requires electric vehicles (EV) as a prominent solution for reducing greenhouse gas emissions. An off‐grid EV charging station plays a significant role in remote regions leading to increased use of EVs. Solar energy promises to be the best solution due to its abundance and simple installation. As solar energy is not constant over a 24‐hour period, there is a need for an energy storage unit (ESU) along with a photovoltaic array. In this paper, we present an efficient design approach that uses a fast‐charging station with a maximum power point tracking boost converter, a bidirectional DC‐DC converter with a snubber circuit, and ESU. The power electronic converters with an active snubber and two capacitive‐diode snubbers act as the energy sources that interface with the ESU. The snubber circuits achieve near zero voltage switching and zero current switching for the converter, thus improving overall efficiency. ESU meets the energy demand for EVs when there is insufficient generated solar energy. On the other hand, during the excess generation of solar energy, ESU utilizes this energy to develop an optimal power management system. This results in a green, reliable, and efficient off‐grid EV charging station. The proposed method is validated using the MATLAB/Simulink environment to verify system performance.
With the penetration of electric vehicles (EVs), there have been paradigm shifts in the transportation sector. EVs are ideally considered to be clean and eco-friendly, but they can overload the existing grid infrastructure and significantly contribute towards carbon emissions depending on the source of charging. The ideal solution is to develop a charging infrastructure for EVs that is integrated with solar energy technology. This paper presents the design of a zero-voltage switching snubber-based bidirectional converter for an off-grid charging station for EVs. The proposed system includes a solar array with a boost converter, a bidirectional converter with snubber circuits and an energy storage unit. A comprehensive comparison between various types of snubbers, such as the resistive capacitive diode snubber, active clamp snubber and flyback snubber, is presented. This type of system configuration clamps the rail voltage, due to the difference in current between leakage inductance and low voltage side-fed inductor currents, resulting in reduced current spikes at the converter’s switches. Such a converter, therefore, leads to higher efficiency of the charging station for EVs. The design of a snubber-based off-grid charging station for EVs is formulated and validated in the MATLAB/Simulink environment.
Electric vehicles (EVs) are becoming essential elements for both the transport and power sectors. Consequently, they need a suitable charging infrastructure at the same time. Electric vehicle charging stations (EVCS) assisted by photovoltaic (PV) panels draw attention due to minimal expenditure, increased environmental awareness, and a consistent increase in the effectiveness of the PV modules. In this paper, a combination control scheme utilizing the merits of both droop and master-control strategies for the EVCS is proposed. In addition, an isolated bidirectional DC-DC converter combined with the snubber circuits and a three-level boost converter that utilizes a capacitance-voltage control design is used to further enhance the system stability. The design of the EVCS is formulated and validated through MATLAB/Simulink.
A person gets frustrated when he faces slow speed as many devices are connected to the same network. As the number of people accessing wireless internet increases, it's going to result in clogged airwaves. Li-Fi is transmission of data through illumination by taking the fiber out of fiber optics by sending data through a LED light bulb that varies in intensity faster than the human eye can follow.As Li-Fi is considered to be the optical version of Wi-Fi, some label it as fast and cheap wireless communication system. When LED is on digital 1 is transmitted and when it is off 0 is transmitted. Data can be encoded in the light by varying the flickering rate to generate strings of 1s and 0s. The output appears to be constant to the human eye as the LED intensity is modulated rapidly.
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