scholarly journals Could the space probe Philae© be energized remotely?

2019 ◽  
Vol 6 (2) ◽  
pp. 154-160
Author(s):  
Alessandra Costanzo ◽  
Luca Roselli ◽  
Apostolos Georgiadis ◽  
Nuno Borges Carvalho ◽  
Alexandru Takacs ◽  
...  
Keyword(s):  
Power Transmission ◽  
Fundamental Problem ◽  
System Level ◽  
Space Probe ◽  
Solar Panels ◽  
Wireless Power ◽  
Power Sources ◽  
Operational Energy ◽  
Comet Activity ◽  
Comet 67P

Space probes suffer from a fundamental problem, which is the limited energy available for their operation. Energy supply is essential for continuous operation and ultimately the most important sub-system for its sustainable functioning. Considering, for instance, the last space probe put on Comet 67P/Churyumov–Gerasimenko, called “Philae”, which was sent by Rosetta (http://www.esa.int/Our_Activities/Space_Science/Rosetta), to operate and to monitor comet activity, its operation was jeopardized due to the fact that it landed on a shadowed zone (no direct sunlight). Since its operational energy was only based on solar harvesters, the energy for its operation was limited by solar energy availability. In this paper a study on a viable alternative based on wireless power transmission is presented and discussed at the system level. It is proved that, using current technology, it is possible to create alternatives or supplement to existing power sources such as solar panels to power up these important space probes and to secure their operation.

scholarly journals Duty-Cycled Wireless Power Transmission for Millimeter-Sized Biomedical Implants

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2130
Author(s):  
Muhammad Abrar Akram ◽  
Kai-Wen Yang ◽  
Sohmyung Ha
Keyword(s):  
Duty Cycle ◽  
Power Transmission ◽  
Electromagnetic Coupling ◽  
System Level ◽  
Cmos Process ◽  
Biomedical Implants ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Short Period ◽  
Circuit Components

Wireless power transmission (WPT) using an inductively coupled link is one of the most popular approaches to deliver power wirelessly to biomedical implants. As the electromagnetic wave travels through the tissue, it is attenuated and absorbed by the tissue, resulting in much weaker electromagnetic coupling than in the air. As a result, the received input power on the implant is very weak, and so is the input voltage at the rectifier, which is the first block that receives the power on the implant. With such a small voltage amplitude, the rectifier inevitably has a very poor power conversion efficiency (PCE), leading to a poor power transfer efficiency (PTE) of the overall WPT system. To address this challenge, we propose a new system-level WPT method based on duty cycling of the power transmission for millimeter-scale implants. In the proposed method, the power transmitter (TX) transmits the wave with a duty cycle. It transmits only during a short period of time and pauses for a while instead of transmitting the wave continuously. In doing so, the TX power during the active period can be increased while preserving the average TX power and the specific absorption rate (SAR). Then, the incoming voltage becomes significantly larger at the rectifier, so the rectifier can rectify the input with a higher PCE, leading to improved PTE. To investigate the design challenges and applicability of the proposed duty-cycled WPT method, a case for powering a 1 × 1-mm2-sized neural implant through the skull is constructed. The implant, a TX, and the associated environment are modeled in High-Frequency Structure Simulator (HFSS), and the circuit simulations are conducted in Cadence with circuit components in a 180-nm CMOS process. At a load resistor of 100 kΩ, an output capacitor of 4 nF, and a carrier frequency of 144 MHz, the rectifier’s DC output voltage and PCE are increased by 300% (from 1.5 V to 6 V) and by 50% (from 14% to 64%), respectively, when the duty cycle ratio of the proposed duty-cycled power transmission is varied from 100% to 5%.

scholarly journals Solar Panel and Wireless Power Transmission System as a Smart Grid for Electric Vehicles

2020 ◽  
Vol 10 (3) ◽  
pp. 5683-5688
Author(s):  
M. E. Bendib ◽  
A. Mekias
Keyword(s):  
Smart Grid ◽  
Power Transmission ◽  
Numerical Data ◽  
Fem Analysis ◽  
Design Parameters ◽  
Solar Panels ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
3D Finite Element Method ◽  
Smart Grid System

In this work, a smart grid system consisting of solar panels and a battery is presented for an electric or hybrid vehicle. For the integration of green power in our system, solar panels are used to charge the accumulator while the power exchange between the vehicle and the grid is realized by power wireless transfer. This paper presents the design, control, and tests of the wireless power transmission, using the basics of magnetic resonant coupling. Numerical data of the power transfer efficiency of the receiver are presented. Graphs are given to show the comparison of power and efficiency with the distance of the coils. Magnetic and electric models of the system are used to analyze the problem. Using the analysis outcome, a compromise is made to come to an acceptable design achieving both requirements. In particular, appropriate design parameters and resonance frequency are obtained. The analytical results are confirmed by 3D Finite Element Method (FEM) analysis.

Data Transmission Using Original Coils in Resonant Wireless Power Transmission

2011 ◽  
Vol E94-B (11) ◽  
pp. 3172-3174 ◽  
Author(s):  
Takashi MARUYAMA ◽  
Tatsuya SHIMIZU ◽  
Mamoru AKIMOTO ◽  
Kazuki MARUTA
Keyword(s):  
Data Transmission ◽  
Power Transmission ◽  
Wireless Power ◽  
Wireless Power Transmission

Modelling of Wireless Power Transmission

2019 ◽  
Vol 7 (2) ◽  
pp. 244-248
Author(s):  
SK.Abbas . ◽  
P.Jyothi Swaroop ◽  
M. Swathi Priyanka ◽  
R.Dinesh .
Keyword(s):  
Power Transmission ◽  
Wireless Power ◽  
Wireless Power Transmission

Compensating Resonant Frequency via Adjusting Adjustable Coil Automatically

2019 ◽  
Vol 12 (5) ◽  
pp. 432-438
Author(s):  
Jin Xu ◽  
Yuting Zhao
Keyword(s):  
Resonant Frequency ◽  
Power Transmission ◽  
Reference Value ◽  
Transmission Efficiency ◽  
Theoretical Research ◽  
Future Research ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Resonant Coupling ◽  
Transmission Distance

Background: Detuning is the main problem that affects the efficiency and transmission distance of the resonant coupling Wireless Power Transmission (WPT). The distance of load and the offset of the load position could cause serious detuning. Methods: This paper presents an adjustable coil in which inductance can be adjusted. Then a model of WPT was established that could compensate resonant frequency automatically using the adjustable coil. Next, the relationship between the primary resonant frequency and the transmission efficiency is analyzed from the circuit. The analysis proved that the design of the adjustable coil could improve the transmission efficiency of the WPT system. Finally, a prototype of WPT system was built. Results: The experimental results showed that WPT system with adjustable coil can improve the transmission efficiency which proves the theoretical research. At the same time, it has essential reference value for the future research of WPT. Conclusion: In this paper, aiming at the system detuning caused by some other factors, such as the position shift of the load during the wireless power transmission, an adjustable coil is proposed.

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