Design of High-Power and High-Density Photovoltaic Modules Based on a Shingled Cell String

Building-integrated photovoltaic (BIPV) arrays, which are installed on the roofs of buildings as part of urban solar power generation, have created a demand for high-power and high-density photovoltaic (PV) modules to produce high-output power in a limited area. In this paper, a high-power PV module using a shingles technology is designed. When the vertical and horizontal dimensions of the module were 201.78 cm × 96.75 cm in the same area as that of the conventional PV module, the number of cell strips reached 390. When six 65-interconnection shingled strings were connected in series, the output power of 367.8 W was achieved. Compared with a conventional PV module of the same area, the output power was 8% greater.

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Broadband Linear High-Power Amplifier Based on the Parallel Amplification Architecture for Electromagnetic Ultrasonic Guided Wave

Sensors ◽

10.3390/s19132924 ◽

2019 ◽

Vol 19 (13) ◽

pp. 2924

Author(s):

Jinjie Zhou ◽

Yang Zheng

Keyword(s):

Output Power ◽

Power Amplifier ◽

High Power ◽

Guided Wave ◽

High Output Power ◽

Electromagnetic Acoustic Transducer ◽

Differential Structure ◽

Ultrasonic Guided Wave ◽

Linear Power Amplifier ◽

High Output

The linear power amplifier with high-output power in the broadband frequency is the critical component required by exciting the electromagnetic acoustic transducer (EMAT) to generate ultrasonic guided wave (UGW). The methods to realize the output of a high-power signal in the linear amplification mode and to expand the bandwidth at high-output power are seldom reported. To solve these problems, a power amplifier with differential structure is developed by using the parallel amplification architecture and the broadband feedback circuits. The proposed power amplifier uses a differential structure to suppress the even harmonic waves and remove the disruptions. Each branch of the differential structure consists of five linear power amplifier modules with output terminals connected in parallel to increase the output power. Also, the negative voltage feedback is used to extend the bandwidth of the power amplifier. The experimental results show that the −3 dB bandwidth of the amplifier is from 40 kHz to 2.5 MHz, and the transient output power is greater than 1 kW. The power amplifier can drive the EMATs to generate ultrasonic guided waves. Because of the high-output power and good linearity, the proposed power amplifier has excellent potential for EMAT UGW applications.

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Effects of Reflectance of Backsheets and Spacing between Cells on Photovoltaic Modules

Applied Sciences ◽

10.3390/app12010443 ◽

2022 ◽

Vol 12 (1) ◽

pp. 443

Author(s):

Hyunsoo Lim ◽

Seong Hyeon Cho ◽

Jiyeon Moon ◽

Da Yeong Jun ◽

Sung Hyun Kim

Keyword(s):

Output Power ◽

Manufacturing Process ◽

Power Loss ◽

Power Efficiency ◽

Loss Rate ◽

Optical Loss ◽

Photovoltaic Modules ◽

Pv Module ◽

Pv Cell ◽

In Series

In the photovoltaic (PV) module manufacturing process, cell-to-module (CTM) loss is inevitably caused by the optical loss, and it generally leads to the output power loss of about 2~3%. It is known that the CTM loss rate can be reduced by increasing the reflectance of a backsheet and reflective area through widening spaces between the PV cell strings. In this study, multi-busbars (MBB) and shingled PV cells were connected in series, and a mini-module composed of four cells was fabricated with a white and black backsheet to investigate the effects of reflectance of backsheets and space between the PV cells. Moreover, the MBB modules with cell gap spaces of 0.5 mm, 1.5 mm, and 2.5 mm were demonstrated with fixed 3 mm spaces between the strings. The shingled modules with varying spaces from 2 mm to 6 mm were also tested, and our results show that spacing between PV cells and strings should be well-balanced to minimize the CTM loss to maximize the output power (efficiency).

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A novel multilayer composite structured thermoelectric module with high output power

Journal of Materials Chemistry A ◽

10.1039/c9ta13881a ◽

2020 ◽

Vol 8 (6) ◽

pp. 3379-3389 ◽

Cited By ~ 1

Author(s):

Xue Wang ◽

Hongchao Wang ◽

Wenbin Su ◽

Teng Wang ◽

María A. Madre ◽

...

Keyword(s):

Heat Transfer ◽

Output Power ◽

High Power ◽

Thermoelectric Module ◽

Single Element ◽

Multilayer Composite ◽

High Output Power ◽

Parallel Connection ◽

High Output

A novel high-power MCTEM composed of several alternately stacked thermoelectric slices and inner electrodes is first proposed, which achieves parallel heat transfer and electrical parallel connection in a single element simultaneously.

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