- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Power recovery and equalization in partially shaded photovoltaic strings by an efficient switched capacitor converter
摘要： Partial shading is the major complication encountered by the Photovoltaic strings while delivering maximum power to the load. This scenario consequently diminishes the functionality of the modules causing mismatch, hotspot, power loss and multiple peaks formation in the characteristics curves of the strings. Also, formation of multiple peaks affects the performance of the maximum power point trackers due to false tracking resulting in severe power loss. In this paper, a switched-capacitor converter for power recovery and equalization in the strings during shading is proposed. The parallel-ladder architecture of the converter maintains voltage ratios by transferring power between the shaded and unshaded modules of the strings. The converter enables the string to generate maximum power by ensuring single peak in the characteristics curves during shading. The performance of the string with the proposed converter is compared to conventional strings using characteristics curves, and various performance parameters. The systems are tested in MATLAB/Simulink and experimental setup under various static and dynamic partial shading conditions. Also, the conduction losses encountered by the converter during power balancing in the strings are analysed and expressed mathematically. The results clearly indicate that the proposed converter can be easily implemented in the strings to recover the power losses and avoid multiple peaks formation in the characteristics curves during partial shading with efficiency greater than 99%.
关键词： Maximum power point,Photovoltaic (PV) strings,Partial shading,Differential power processing (DPP),Switched-capacitor (SC) converter
更新于2025-09-16 10:30:52
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[IEEE 2019 3rd International Conference on Computing Methodologies and Communication (ICCMC) - Erode, India (2019.3.27-2019.3.29)] 2019 3rd International Conference on Computing Methodologies and Communication (ICCMC) - The application of DC borewell with High Step-Up DC-DC Converter By Using Photovoltaic System
摘要： In this paper, the application of DC borewell with high step-up DC-DC converter used to produce high voltage gain along with coupled inductor and switched capacitor technique. This topology consist of switched voltage multiplier capacitor and coupled inductor. The switched capacitor get charged in switch off period by using energy accumulated in coupled inductor which increase the losses are voltage gain. Therefore, the conduction minimized with the RDS low resistance and main power switch circuit. The simulation model of “The application of DC borewell with high Step-up DC-DC Converter is based on switched Using Photovoltaic System” capacitor and coupled inductor techniques. MATLAB software is used to give input of 17v from the PV panel and expectedly got output voltage of load 500 v and power of 200W. Finally, checked its working with basic circuit of 20v I/P and 530V O/P.
关键词： coupled inductor,photovoltaic system,switched capacitor,DC borewell motor,converter
更新于2025-09-16 10:30:52
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A Multi-Phase Switched-Capacitor Converter for Fully Integrated AMLED Micro Display System
摘要： A fully-integrated switched-capacitor (SC) DC-DC converter is designed for powering up an active-matrix light-emitting diode (AMLED) micro-display system. Stacking-transistor technique with three voltage conversion ratios is utilized to handle the lithium-ion battery range of 2.6 V to 4.2 V and to reduce the switching loss. A 101-phase interleaving scheme is adopted such that (1) output voltage ripple ΔVO is significantly reduced; (2) no external output capacitor is needed; and (3) SC power-cells are physically cascaded to encircle the LED array and drivers to reduce conduction loss. Two test chips were designed in 0.18 μm 1P6M CMOS technology. The first chip is a test chip consisted of the SC converter only. The output voltage is 4.2V and the measured maximum ΔVO is 52 mV. The measured power density is 74.4 mW/mm2, peak efficiency is 81%, and maximum output power is 258 mW. The second chip is a system chip integrating the SC converter with the AMLED array and drivers using flip-chip packaging. The converter delivers a maximum power of 216 mW with a 78% peak efficiency in the SC mode and a 91% peak efficiency in the linear regulator mode.
关键词： AMLED,micro-displays,voltage regulator,LED driver,active matrix,SC converter,DC-DC converter,μ-displays,multiphase interleaving,battery-connected,switched-capacitor converter
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Baltimore, MD, USA (2019.9.29-2019.10.3)] 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Resonant Switched-capacitor Auxiliary Circuit for Active Power Decoupling in Electrolytic Capacitor-less AC/DC LED Drivers
摘要： This paper introduces an auxiliary circuit that is used to buffer double-line-frequency ripple power and form electrolytic capacitor-less single-phase AC/DC LED drivers. The proposed auxiliary circuit is implemented by a resonant switched capacitor circuit behaving as a gyrator circuit, namely a voltage-dependent current source. The output current of the auxiliary circuit is regulated with constant on-time and hysteresis control schemes. Comparing with other alternative methods, the proposed auxiliary circuit has less power loss due to its zero-current switching (ZCS) operation, and includes smaller passive components because of its higher operating frequency (about 3 MHz). An LED driver prototype with the proposed auxiliary circuit is built, and the experimental results are given to verify the proposed topology and the parameter design.
关键词： resonant switched-capacitor circuit,ac–dc power conversion,electrolytic capacitor less,LED driver,ripple power decoupling
更新于2025-09-12 10:27:22
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A New Transformer-less Five-level Grid-Tied Inverter for Photovoltaic Applications
摘要： A new fundamental structure of a single-phase transformer-less grid connected multilevel inverter based on a switched-capacitor structure is presented in this study. By employing the series-parallel switching conversion of the integrated switched-capacitor module in a packed unit, attractive features for the proposed inverter can be obtained such as high efficiency and boosting ability within a single stage operation. Also, using a common grounding technique provides an additional advantage of reducing the leakage current. Moreover, the presented structure generates a multilevel waveform at the output voltage terminals which reduces the harmonics in the system. A peak current controller is utilized for triggering the gate of the power switches and controlling both the active and reactive powers. This results in a tightly controlled current with an appropriate quality that can be injected to the grid using a single source resource. Operating procedures, design considerations, comparison studies and test results of a 620 W prototype are also presented to validate the accuracy and feasibility of the proposed multilevel inverter.
关键词： Grid connected multilevel inverter,transformer-less inverter,switched-capacitor based structure,leakage current elimination
更新于2025-09-11 14:15:04