scholarly journals Design of an Intrinsically Safe Series-Series Compensation WPT System for Automotive LiDAR

Electronics ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 86 ◽  
Author(s):  
Luiz Cardoso ◽  
Vítor Monteiro ◽  
José Pinto ◽  
Miguel Nogueira ◽  
Adérito Abreu ◽  
...  
Keyword(s):  
Low Power ◽  
Design Procedure ◽  
Power Converter ◽  
Open Circuit ◽  
Secondary Coil ◽  
Primary Circuit ◽  
Power Transfer ◽  
Coupling Coefficients ◽  
Primary Coil ◽  
Resonant Condition

The earliest and simplest impedance compensation technique used in inductive wireless power transfer (WPT) design is the series-series (SS) compensation circuit, which uses capacitors in series with both primary and secondary coils of an air-gapped transformer. Despite of its simplicity at the resonant condition, this configuration exhibits a major sensitivity to variations of the load attached to the secondary, especially when higher coupling coefficients are used in the design. In the extreme situation that the secondary coil is left at open circuit, the current at the primary coil may increase above the safety limits for either the power converter driving the primary coil or the components in the primary circuit, including the coil itself. An approach often used to minimize this problem is detuning, but this also reduces the electrical efficiency of the power transfer. In low power, fixed-distance stationary WPT, a fair trade-off between efficiency and safety must be verified. This paper aims to consolidate a simple design procedure for such a SS-compensation, exemplifying its use in the prototype of a WPT system for automotive light detection and ranging (LiDAR) equipment. The guidelines herein provided should equally apply to other low power applications.

scholarly journals A Power Converter Decoupled from the Resonant Network for Wireless Inductive Coupling Power Transfer

Energies ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1192 ◽  
Author(s):  
Lin Chen ◽  
Jianfeng Hong ◽  
Mingjie Guan ◽  
Wei Wu ◽  
Wenxiang Chen
Keyword(s):  
Theoretical Analysis ◽  
Power Control ◽  
Power Source ◽  
Power Converter ◽  
Soft Switching ◽  
Inductive Coupling ◽  
System Efficiency ◽  
Power Transfer ◽  
Coupling Coefficients ◽  
Strongly Coupled

In a traditional inductive coupling power transfer (ICPT) system, the converter and the resonant network are strongly coupled. Since the coupling coefficient and the parameters of the resonant network usually vary, the resonant network easily detunes, and the system efficiency, power source capacity, power control, and soft switching conditions of the ICPT system are considerably affected. This paper presents an ICPT system based on a power converter decoupled from the resonant network. In the proposed system, the primary inductor is disconnected from the resonant network during the energy injection stage. After storing a certain amount of energy, the primary inductor is reconnects with the resonant network. Through this method, the converter can be decoupled from the resonant network, and the resonant network can be tuned under various coupling coefficients. Theoretical analysis was explored first. Simulations and experimental work are carried out to verify the theoretical analysis. The results show that the proposed ICPT system has the virtues of low power source capacity, independent power control, and soft switching operation under different coupling coefficients.

scholarly journals Design of Wireless Power Transfer for Heart Assist Devices

2019 ◽  
Vol 8 (12S) ◽  
pp. 73-76
Keyword(s):  
Blood Flow ◽  
The Body ◽  
Secondary Coil ◽  
Power Transfer ◽  
Wireless Power ◽  
Primary Coil ◽  
Short Term ◽  
Assist Devices ◽  
Heart Pump ◽  
Heart Assist Devices

Heart assist devices are designed for helping damaged hearts maintain sufficient blood flow, for patients getting heart attack with short term and it is used for congestive heart failure patients. The frequency with which the patients are being operated to replace the battery of these devices can be aided and reduced by wirelessly transmitting power. The transcutaneous power transfer for the devices requires charges that move outside the body to induce charges to move inside the body which can ultimately be used to supply energy to the heart pump. WPT is a method of transmitting wireless power using an external primary coil to generate a magnetic field. It passes through the skin and induces current in an implanted secondary coil. The infection caused due to surgery is removed by WPT method. To monitor the charging level of the battery the Wi-fi module is used. It also monitors the corresponding blood flow and the pulse during this function.

scholarly journals Simulation Analysis of Wireless Power Transfer for Future Office Communication Systems

2019 ◽  
Vol 8 (9S) ◽  
pp. 533-538
Keyword(s):  
Output Power ◽  
Communication Systems ◽  
Wireless Power Transfer ◽  
Secondary Coil ◽  
Receiver Coil ◽  
Input Frequency ◽  
Power Transfer ◽  
Wireless Power ◽  
Primary Coil ◽  
Transmitter Coil

A Wireless Power Transfer system consists of a transmitter coil which is inductively coupled with secondary coil and is popular for wireless charging of future office communication system. Wireless power transfer is used in different applications ranging from mobile chargers to charging stations. In this paper simulation of Wireless Power Transfer for future office communication systems has been conducted over Maxwell 3d of Ansys electromagnetic suite. The input frequency of primary coil is varied from 1kHz -120kHz with respect to the change in resonant capacitance and observed that input frequency between 20kHz-30 kHz, the output power in secondary coil appears to be maximum at variable distances between transmitter coil and receiver coil. There is an improvement of 72% seen in the output power of secondary coil for 25kHz input frequency of primary coil as compared with 40kHz input frequency. This model can be helpful to design future Office Communication systems for charging the mobile phones, Laptops and to turn on the printer wirelessly.

scholarly journals Simulation-Assisted Design Process of a 22 kW Wireless Power Transfer System Using Three-Phase Coil Coupling for EVs

2021 ◽  
Vol 13 (21) ◽  
pp. 12257
Author(s):  
Chia-Hsuan Wu ◽  
Ching-Ming Lai ◽  
Tomokazu Mishima ◽  
Zheng-Bo Liang
Keyword(s):  
High Power ◽  
Coupling Coefficient ◽  
High Efficiency ◽  
Design Procedure ◽  
Wireless Power Transfer ◽  
Power Converter ◽  
Air Gap ◽  
Power Transfer ◽  
Wireless Power ◽  
Three Phase

The objective of this paper is to study a 22 kW high-power wireless power transfer (WPT) system for battery charging in electric vehicles (EVs). The proposed WPT system consists of a three-phase half-bridge LC–LC (i.e., primary LC/secondary LC) resonant power converter and a three-phase sandwich wound coil set (transmitter, Tx; receiver, Rx). To transfer power effectively with a 250 mm air gap, the WPT system uses three-phase, sandwich-wound Tx/Rx coils to minimize the magnetic flux leakage effect and increase the power transfer efficiency (PTE). Furthermore, the relationship of the coupling coefficient between the Tx/Rx coils is complicated, as the coupling coefficient is not only dominated by the coupling strength of the primary and secondary sides but also relates to the primary or secondary three-phase magnetic coupling effects. In order to analyze the proposed three-phase WPT system, a detailed equivalent circuit model is derived for a better understanding. To give a design reference, a novel coil design method that can achieve high conversion efficiency for a high-power WPT system was developed based on a simulation-assisted design procedure. A pair of magnetically coupled Tx and Rx coils and the circuit parameters of the three-phase half-bridge LC–LC resonant converter for a 22 kW WPT system are adjusted through PSIM and CST STUDIO SUITE™ simulation to execute the derivation of the design formulas. Finally, the system achieved a PTE of 93.47% at an 85 kHz operating frequency with a 170 mm air gap between the coils. The results verify the feasibility of a simulation-assisted design in which the developed coils can comply with a high-power and high-efficiency WPT system in addition to a size reduction.

scholarly journals Research on Characteristics of Wireless Power Transfer System Based on U-Type Coupling Mechanism

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Jia Jinliang ◽  
Yan Xiaoqiang
Keyword(s):  
Power Supply ◽  
Wireless Power Transfer ◽  
Secondary Coil ◽  
Coupling Mechanism ◽  
Transfer System ◽  
Power Transfer ◽  
Wireless Power ◽  
Primary Coil ◽  
Type Coupling ◽  
Wireless Power Transfer System

Aiming at the power supply problem of high-speed rotating equipment, a wireless power transfer system based on U-shaped core coupling mechanism with a primary coil is proposed. Firstly, the transfer model of the U-type coupling mechanism wireless power transfer system is established. The expressions of transfer power and transfer efficiency are obtained by theoretical calculation, and the factors affecting the transfer characteristics of the system are analyzed. At the same time, the magnetic field distribution of the system and the coupling parameters change when the relative position of the primary and secondary coils changes through simulation analysis. Finally, an experimental platform is established for experimental verification. The results show that the system can obtain 1.72 w output power with 51.19% transfer efficiency when the distance between the secondary coil and U-core is 15 mm and 30 mm, respectively. The transmission efficiency and power of the primary coil and secondary coil under different misalignments are tested and compared. It is proved that the wireless power transfer system based on U-type coupling mechanism can effectively realize the stable power supply of the rotating equipment monitoring system.

scholarly journals Effect of tuning capacitance of passive power repeaters on power transfer capability of inductive power transfer systems

2018 ◽  
Vol 5 (2) ◽  
pp. 97-104
Author(s):  
Rong Hua ◽  
Aiguo Patrick Hu
Keyword(s):  
Output Power ◽  
Secondary Coil ◽  
Power Transfer ◽  
Primary Coil ◽  
Inductive Power Transfer ◽  
Optimal Tuning ◽  
Transfer Capability ◽  
Passive Power ◽  
The Relationship ◽  
Inductive Power

Power repeaters are used to extend the power transfer range or enhance the power transfer capability of Inductive Power Transfer (IPT) systems, but how to tune the power repeaters to improve the system power transfer performance remains an unsolved problem. In this paper, studies of the effect of the tuning capacitance of the power repeater of an IPT system on the power transfer capability are presented. A theoretical model is established to analyze the output power of the system with the primary coil and secondary coil tuned at a nominal resonant frequency, and a passive power repeater placed in between. By analyzing the relationship between the tuning capacitance of the power repeater and the output power, a critical tuning capacitance which sets up the boundary between enhancing and reducing the output power is determined, and the optimal tuning capacitances corresponding to the maximum and minimum output power are also obtained. A practical IPT system with a passive power repeater placed at 40, 80, and 104 mm from the primary coil is built. It has shown that the practically measured critical capacitance and the optimal tuning capacitance for maximum power transfer are in good agreement with the analytical results.

Experiments on the Rhythmic Stimulation of Sensory Nerves of the Skin

1897 ◽  
Vol 21 ◽  
pp. 189-194
Keyword(s):  
Sulphuric Acid ◽  
Induction Machine ◽  
Sensory Nerves ◽  
Secondary Coil ◽  
Primary Circuit ◽  
Common Salt ◽  
Cent Solution ◽  
Primary Coil ◽  
Platinum Foil ◽  
Stimulation Of

Suppose we introduce a telephone a into the primary circuit of an ordinary induction coil, such as used in physiological laboratories, and another telephone b into the circuit of the secondary coil, and suppose the wires connecting telephone a with the primary and connecting telephone b to be many yards in length. If one observer speaks into a, another observer will hear every word if b is applied to his ear. Every one is acquainted with this fact, that the currents awakened in a induce corresponding currents in the secondary coil, which are transmitted to b. If we substitute for a a microphone-transmitter c, and speak to it, the tones are reproduced by telephone b.Further, as I showed to the Society in February last, if we suspend a microphone-transmitter over the phonograph, when the latter is in motion and giving out tones, the variations in resistance in the microphone-transmitter produce such alterations in the current flowing through it to the coils of an electro-magnet as to make it possible, mechanically, to record these variations.These considerations led me some months ago to try the following experiment. The microphone-transmitter was suspended over the phonograph disk, and it was introduced into the circuit of the primary coil of the induction machine along with four Obach's cells (Q type). The terminals of the secondary coil were carried to two strips of platinum foil immersed in two insulated vessels (glass beakers or shallow vulcanite troughs) containing a ·75 per cent. solution of common salt or sulphuric acid (1:10 of water).

Design procedure for the primary circuit of the Konvoi plants

1991 ◽  
Vol 130 (3) ◽  
pp. 451-457
Author(s):  
D. Kuschel ◽  
W. Zeitner
Keyword(s):  
Design Procedure ◽  
Primary Circuit

scholarly journals Design and optimisation of magnetically-tunable hybrid piezoelectric-triboelectric energy harvester

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Satish Rao Ganapathy ◽  
Hanim Salleh ◽  
Mohammad Khairul Azwan Azhar
Keyword(s):  
Low Power ◽  
Peak Power ◽  
Energy Harvester ◽  
Open Circuit ◽  
Frequency Range ◽  
Design Factor ◽  
Voltage Generation ◽  
Future Work ◽  
Design Factors ◽  
Extension Length

AbstractThe demand for energy harvesting technologies has been increasing over the years that can be attributed to its significance to low power applications. One of the key problems associated with the available vibration-based harvester is the maximum peak power can only be achieved when the device frequency matches the source frequency to generate low usable power. Therefore, in this study, a magnetically-tunable hybrid piezoelectric-triboelectric energy harvester (MT-HPTEH) was designed and optimised. Four key design factors: mass placement, triboelectric surface area, extension length and magnetic stiffness were investigated and optimised. The voltage generation from piezoelectric and triboelectric mechanisms was determined individually to understand the effect of each design factor on the mechanisms. An output power of 659 µW at 180 kΩ at 44 Hz was obtained from the optimised MT-HPTEH with a theoretical–experimental discrepancy of less than 10%. The added magnetically-tunable feature enabled the harvester to work at the desired frequency range with an open circuit voltage between 7.800 and 20.314 V and a frequency range from 38 to 54 Hz. This MT-HPTEH can power at least six wireless sensor networks and can be used for low power applications such as RFID tags. Future work may include designing of energy-saving and sustainable harvester.

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