Papers by Ezekiel Bokolonga
Proceedings of the 3rd World Congress on Electrical Engineering and Computer Systems and Science, Jul 1, 2022
This paper presents an LLC resonant converter with double resonant tanks configured for a wide-in... more This paper presents an LLC resonant converter with double resonant tanks configured for a wide-input-voltage range application. The converter comprises four power switches (MOSFETs), a pair of resonant tanks with LLC configuration, and two centretapped transformers. Its operation is similar to that of a conventional half-bridge LLC resonant converter, where the primary windings of the transformers are connected across the half-bridge network via the tanks. However, the main attributing factor to the design is the ability to operate in two consecutive modes, depending on the desired input voltage range. Mode 1 is operational to a low input voltage range while Mode 2 is operational to a high input voltage range. These two modes delivered power twice every cycle to the load in a different fashion (switching techniques) but with the same ability to share power among the resonant tank elements for voltage/current stress relieve. Interestingly, each mode regulates the output for a wide input voltage range within the same frequency range. The operation and analysis of the proposed converter is respectively discussed in this paper followed by a validation with experimental results.
Research Square (Research Square), May 4, 2022
In this paper, we present the design and evaluation of a Parrot drone multispectral imaging syste... more In this paper, we present the design and evaluation of a Parrot drone multispectral imaging system based on multispectral Red-Green-Blue (RGB) and Near-infrared (NIR) imaging camera units; the multi-color RGB camera captures true color geo-tagged images using a Global positioning System (GPS). The two cameras are triggered simultaneously via the GPIO pins of the raspberry pi boards programmed in Python language. Captured images are stored in native le generated format (10-bit raw data) on a micro SDcard. The intensity-based automatic registration method was applied to de ne the positive correlation between the two captured RGB and NIR images for display purposes. The above-mentioned method is used to determine image transformation for registration and alignment, by applying the bilinear interpolation. The design was implemented and the prototype was validated in different environmental situations.
In this paper, we present the design and evaluation of a Parrot drone multispectral imaging syste... more In this paper, we present the design and evaluation of a Parrot drone multispectral imaging system based on multispectral Red-Green-Blue (RGB) and Near-infrared (NIR) imaging camera units; the multi-color RGB camera captures true color geo-tagged images using a Global positioning System (GPS). The two cameras are triggered simultaneously via the GPIO pins of the raspberry pi boards programmed in Python language. Captured images are stored in native file generated format (10-bit raw data) on a micro SD-card. The intensity-based automatic registration method was applied to define the positive correlation between the two captured RGB and NIR images for display purposes. The above-mentioned method is used to determine image transformation for registration and alignment, by applying the bilinear interpolation. The design was implemented and the prototype was validated in different environmental situations.
雄バチの展開のためのコンパクトなマルチスペクトル画像入力装置【Powered by NICT】
A compact multispectral image capture unit for deployment on drones
2016 IEEE International Instrumentation and Measurement Technology Conference Proceedings, 2016
The design, implementation and evaluation of a lightweight portable multispectral imaging system ... more The design, implementation and evaluation of a lightweight portable multispectral imaging system for deployment on drones is presented in this paper. The dual cameras used enable concurrent capture of red, green, blue (RGB) and near-infrared (NIR) images using simultaneous triggering. The images are stored in native file generated format. A global positioning system (GPS) connected to the camera's controllers enables geo-tagging of the images via exchangeable image file format (EXIF) metadata. A second-order polynomial has been utilized in order to align and test the RGB and NIR images to attain subpixel accuracy. The system was implemented in the matrix laboratory (MATLAB) and the developed algorithm was verified for accuracy considering different environmental conditions and scenarios.
World Congress on Electrical Engineering and Computer Systems and Science
This paper presents an LLC resonant converter with double resonant tanks configured for a wide-in... more This paper presents an LLC resonant converter with double resonant tanks configured for a wide-input-voltage range application. The converter comprises four power switches (MOSFETs), a pair of resonant tanks with LLC configuration, and two centretapped transformers. Its operation is similar to that of a conventional half-bridge LLC resonant converter, where the primary windings of the transformers are connected across the half-bridge network via the tanks. However, the main attributing factor to the design is the ability to operate in two consecutive modes, depending on the desired input voltage range. Mode 1 is operational to a low input voltage range while Mode 2 is operational to a high input voltage range. These two modes delivered power twice every cycle to the load in a different fashion (switching techniques) but with the same ability to share power among the resonant tank elements for voltage/current stress relieve. Interestingly, each mode regulates the output for a wide input voltage range within the same frequency range. The operation and analysis of the proposed converter is respectively discussed in this paper followed by a validation with experimental results.
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Papers by Ezekiel Bokolonga