scholarly journals Equivalent circuit modeling in GaN wireless power transmission including stray inductance and capacitance by measuring radiated emission

2022 ◽  
Author(s):  
Toshihide IDE ◽  
Mitsuaki Shimizu ◽  
Noriyuki TAKADA
Keyword(s):  
Power Transmission ◽  
Supply Voltage ◽  
Peak Shift ◽  
Stray Capacitance ◽  
Resonance Model ◽  
Series Resonance ◽  
Equivalent Circuit Modeling ◽  
Destructive Measurement ◽  
Output Capacitance ◽  
Radiated Emission

Abstract We establish the method for estimating the stray elements of the GaN-WPT circuit by measuring the radiated emission around the GaN switching device. By controlling the circuit supply voltage, the spectrum peak shift due to the output capacitance of the GaN-HEMT is observed. It is found that these peak shift characteristics include the influence of both the stray wire inductance and stray capacitance. By the fitting using the series resonance model, the value of the stray inductance and stray capacitance can be estimated in the non-destructive measurement in the GaN-WPT circuit.

A Three-phase to Seven-phase Energy Transformation under Unbalanced Supply Voltage

2018 ◽  
Author(s):  
Md Tabrez ◽  
Pradip Kumar Sadhu ◽  
Atif Iqbal ◽  
Farhad Ilahi Baksh
Keyword(s):  
Power Transmission ◽  
Supply Voltage ◽  
Power Input ◽  
Phase System ◽  
Ac Power ◽  
Three Phase ◽  
Sequence Components ◽  
Definition Of ◽  
And Control ◽  
Generation Power

In the recent past, multiphase power generation, power transmission, and electrical drive system are the main focus of research due to their several advantages over three phase. Multiphase drives have better performance over three-phase drives. A multiphase transformer is required at the input of a fixed frequency multiphase drive, rectifier circuit for HVDC applications and multiphase generation and transmission systems. This paper investigates a static three to seven phase conversion technique and presents a design of transformer and control strategy to analyze the effect of unbalanced supply on a three phase to seven phase transformer. The transformer so designed takes three phase as input and seven phase output is obtained at the secondary terminals. The paper also discusses input-output unbalancing. A complete design, analysis, simulation of the proposed technique and experimental validation is presented in this paper. Experimental and simulation results prove that the presented design produced a seven-phase from a tree-phase ac power. Input unbalance is reflected to output but is less than the input unbalance. A seven phase output is not produced if one phase of input is open and the transformer has more than three limbs for flux to flow. A balanced seven phase output in steady state is produced even in one phase open condition for a three limb core type transformer. A new definition of sequence components of an unbalanced seven phase system is defined in this paper.

Current Detection Method and its Application of an Extension pq Theory

2014 ◽  
Vol 668-669 ◽  
pp. 907-910 ◽  
Author(s):  
Tian Cai Wei ◽  
Shun Tao ◽  
Bin Su ◽  
Chao Luo
Keyword(s):  
Reactive Power ◽  
Power Transmission ◽  
Supply Voltage ◽  
Rapid Development ◽  
Modern Society ◽  
Power Theory ◽  
Instantaneous Reactive Power Theory ◽  
Energy Evaluation ◽  
Instantaneous Reactive Power ◽  
Electrical Loads

In the modern society, with the rapid development of industrial technology and information industry, electrical loads become more and more complex. As a result, the harmonics and reactive power problems have become increasingly serious. In the non-sinusoidal conditions, conventional power definitions don’t work well any more. Power theory is one of the foundations of financial accounts for energy, evaluation of the efficiency of power transmission and control of current compensation. Among them, the instantaneous reactive power theory is regarded as one of the most promising power theories. What’s more, it has been improved. Based on the three-phase three-wire system and four kinds of different supply voltage conditions, this paper compares the instantaneous reactive power theory (pq theory) with the extension pq theory. At last, the simulation results are presented. As a conclusion, the extension pq theory is the improvement of the pq theory and has a wider applicability.

scholarly journals Power strategy in DC/DC converters to increase efficiency of electrical stimulators

2016 ◽  
Vol 26 (3) ◽  
Author(s):  
Pablo Aqueveque ◽  
Vicente Acuña ◽  
Francisco Saavedra ◽  
Adrien Debelle ◽  
Laurent Lonys ◽  
...  
Keyword(s):  
Power Efficiency ◽  
Power Transmission ◽  
Supply Voltage ◽  
Voltage Regulation ◽  
Limiting Factors ◽  
Battery Life ◽  
Output Stage ◽  
Traditional Use ◽  
Boost Converters ◽  
Hardware Designs

Power efficiency is critical for electrical stimulators. Battery life of wearable stimulators and wireless power transmission in implanted systems are common limiting factors. Boost DC/DC converters are typically needed to increase the supply voltage of the output stage. Traditionally, boost DC/DC converters are used with fast control to regulate the supply voltage of the output. However, since stimulators are acting as current sources, such voltage regulation is not needed. Banking on this, this paper presents a DC/DC conversion strategy aiming to increase power efficiency. It compares, in terms of efficiency, the traditional use of boost converters to two alternatives that could be implemented in future hardware designs.

scholarly journals Inductive Power Transmission for Wearable Textile Heater using Series-None Topology

Electronics ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 431
Author(s):  
Hyeokjin Kwon ◽  
Kang-Ho Lee ◽  
Byunghun Lee
Keyword(s):  
High Temperature ◽  
Power Amplifier ◽  
High Power ◽  
Electrical Resistance ◽  
Power Transmission ◽  
Supply Voltage ◽  
Power Transfer Efficiency ◽  
Resonant Capacitor ◽  
Inductive Power Transmission ◽  
Inductive Power

In this paper, an inductive-power-transmission (IPT) system for a wearable textile heater is proposed to comfortably provide heating to a user’s body. The conductive thread, which has high electrical resistance, was sewn into a receiver (Rx) coil on clothing to generate high temperature with a low current. The proposed wearable heaters are completely washable thanks to their nonmetallic materials, other than conductive threads in the clothing. We introduced series-none (SN) topology to eliminate a resonant capacitor in the wearable textile heater. A single resonant capacitor in a transmitter (Tx) in SN mode was implemented to resonate both Tx and Rx, resulting in increased power delivered to the load (PDL) while maintaining high-power transfer efficiency (PTE), comparable with conventional series-series (SS) topology. When the supply voltage of the power amplifier was 7 V, while the PTE of the SS and SN modes was 85.2% and 75.8%, respectively, the PDL of the SS and SN modes was 2.74 and 4.6 W, respectively.

scholarly journals Reduction of radiated emission from resonance coil in GaN wireless power transmission circuit by using Nd–Fe–N magnetic material

AIP Advances ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 025121 ◽  
Author(s):  
Toshihide Ide ◽  
Nobuyoshi Imaoka ◽  
Mikio Oomori ◽  
Kimihiro Ozaki ◽  
Mitsuaki Shimizu ◽  
...  
Keyword(s):  
Magnetic Material ◽  
Power Transmission ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Radiated Emission

scholarly journals DESIGN OF PROTOTYPE DYNAMIC AC POWER MACHINE WITH EQUIVALENT CIRCUIT MODELING (TORQUE SPEED CURVE OF INDUCTION MOTOR 1,1, KW)

2017 ◽  
pp. 34-38
Author(s):  
Zainal Abidin ◽  
Adam Adam
Keyword(s):  
Induction Motor ◽  
Supply Voltage ◽  
Electric Motor Drives ◽  
Stator Current ◽  
Large Current ◽  
Ac Power ◽  
Equivalent Circuit Modeling ◽  
Power Machine ◽  
Stator Flux ◽  
Torque Values

Squirrel cage induction motors are widely used in electric motor drives due to their satisfactory mechanical characteristics (torque, current, overloading) and small dimensions, as well as their low price. When starting an induction motor, a large current is required for magnetizing its core, which results in a low power factor, rotor power losses and a temperature rise in the windings. None of these parameters should reach values beyond certain limits until the motor reaches nominal speed. The speed of an induction motor 1,1kW is affected very little by fluctuations of voltage. The greater the supply voltage of the motor, the induction motor's speed will increase. The torque values (Tstart, TSmax and Tmax) are affected by the value of the motor supply voltage: (Vp-nl : 132.8, Tstart1 : 7.4, T S-max1 : 0.4, Tmax1 : 9.9) V, (Vp-nl : 127.0, Tstart2 : 4.8, T S-max1 : 0.3, Tmax1 : 8.4) V and (Vp-nl : 121.3, Tstart3 : 3.3, T S-max3 : 0.2, Tmax3 : 7.1) V. Stator current (IL-nl ; 2.5, 2.2, 1.9 ) Amp rises gradually on account of the increase in magnetising current (Im : 2.5, 2.2, 1.9) Amp. The magnetising current required to produce the stator flux. The component of the stator current which provides the ampere-turns balancing the rotor ampere-turns will steadily diminish as the rotor current (IL-nl) decrease with the increase in rotor speed (nr). 

scholarly journals Autonomous Wireless System for Robust and Efficient Inductive Power Transmission to Multi-Node Implants

2021 ◽  
Author(s):  
Peilong Feng ◽  
Timothy G. Constandinou
Keyword(s):  
Power Management ◽  
Power Transmission ◽  
Low Voltage ◽  
Supply Voltage ◽  
Average Power ◽  
Power Transfer ◽  
Recording Channels ◽  
Power Transfer Efficiency ◽  
Inductive Power Transmission ◽  
Power Management Unit

AbstractA number of recent and current efforts in brain machine interfaces are developing millimetre-sized wireless implants that achieve scalability in the number of recording channels by deploying a distributed ‘swarm’ of devices. This trend poses two key challenges for the wireless power transfer: (1) the system as a whole needs to provide sufficient power to all devices regardless of their position and orientation; (2) each device needs to maintain a stable supply voltage autonomously. This work proposes two novel strategies towards addressing these challenges: a scalable resonator array to enhance inductive networks; and a self-regulated power management circuit for use in each independent mm-scale wireless device. The proposed passive 2-tier resonant array is shown to achieve an 11.9% average power transfer efficiency, with ultra-low variability of 1.77% across the network.The self-regulated power management unit then monitors and autonomously adjusts the supply voltage of each device to lie in the range between 1.7 V-1.9 V, providing both low-voltage and over-voltage protection.

Dynamic Transmission Performances of Alumina and Mullite Refractory Ceramics in Microwave High-Temperature Heating

2016 ◽  
Vol 35 (1) ◽  
pp. 113-119 ◽  
Author(s):  
Xiaobiao Shang ◽  
Junruo Chen ◽  
Jinhui Peng
Keyword(s):  
Microwave Heating ◽  
Power Transmission ◽  
Peak Shift ◽  
Transmission Peak ◽  
Temperature Range ◽  
Microwave Transmission ◽  
Power Transmission Coefficient ◽  
Mullite Refractory ◽  
Refractory Ceramics ◽  
Temperature Heating

AbstractThis paper proposes an analytical approach to optimize the thickness of refractories for achieving maximum microwave power transmission in microwave heating based on the analysis of power transmission coefficient (PTC). The microwave PTCs of alumina (Al2O3) ceramics over the temperature range of 22–1,379°C at 2,450 MHz, mullite ceramics in the temperature range of 27–1,027°C at 2.45 GHz and 400–1,300°C at 915 MHz are studied. The results show that there are several transmission peaks in the PTC patterns. The transmission peak amplitude depends sensitively on the thickness of the refractory and the peak shifting towards a smaller thickness as the temperature of the refractory increases. We also show that high microwave transmission can only be achieved in a refractory with a small thickness corresponding to a slight transmission peak shift in the entire microwave heating (less than one eighth wavelength in the refractory).

scholarly journals Single-contact transmission for the quasi-wireless delivery of power over large surfaces

2014 ◽  
Vol 1 (2) ◽  
pp. 75-82 ◽  
Author(s):  
C.W. Van Neste ◽  
J.E. Hawk ◽  
Arindam Phani ◽  
J.A.J. Backs ◽  
Richard Hull ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Close Agreement ◽  
High Efficiency ◽  
Power Transmission ◽  
Small Scale ◽  
Circuit Modeling ◽  
Simple Circuit ◽  
Stray Capacitance ◽  
Contact Transmission ◽  
Single Contact

A method of power transmission is proposed that delivers power through the resonance of a helical receiver with its surrounding stray capacitance. The system operates in a quasi-wireless state where power is transferred over a single connection to a surface much larger than the dimensions of the receiver. This ensures high-efficiency energy transfer over large areas without the need of strong coupling electromagnetic fields. Standard power connectors such as tracks, plugs, and cords may be easily replaced with conductive surfaces or objects such as foil sheets, desks, and cabinets. Presently, the method is experimentally demonstrated at the small scale using loads of up to 50 W at an efficiency of 83% with both bare and insulated surfaces. Simple circuit modeling of the system is presented which shows close agreement with experimental results.

Efficiency Improvement of Underwater Midrange Inductive Contactless Power Transmission Via a Relay Resonator

2014 ◽  
Vol 48 (3) ◽  
pp. 73-87 ◽  
Author(s):  
Jie Zhou ◽  
De-jun Li ◽  
Ying Chen
Keyword(s):  
Magnetic Resonance ◽  
Resonance Frequency ◽  
Power Transmission ◽  
Transmission Efficiency ◽  
Efficiency Improvement ◽  
Stray Capacitance ◽  
Coupled Mode ◽  
System A ◽  
Flat Spiral ◽  
Very High

AbstractInductive contactless power transmission (ICPT) offers a safe and convenient means of delivering energy underwater. However, ICPT is capable of transferring power effectively only within a near-distance range (millimeters). In recent years, magnetic resonance coupled power transmission (MRCPT), which can wirelessly deliver power across a distance of meters, has been introduced and studied. Nevertheless, MRCPT is usually operated at a very high resonance frequency (MHz) and is unavailable for underwater applications because of the considerable power loss in water. In this paper, we present an ICPT system with a relay resonator for a midrange efficiency improvement. The proposed system is based on an (inductor-capacitor) LC resonance circuit, rather than magnetic resonance. The system operates at a lower resonance frequency than the typical MRCPT system. A theoretical model is introduced for the proposed system using coupled mode theory. Theoretical treatments and an analysis of the system parameters are presented for improving the efficiency in underwater environments. The inductance and stray capacitance of a relay coil with a flat spiral profile are calculated. The experimental results indicate that the proposed system can substantially enhance the power transmission efficiency under water in midrange distances (≥10 cm) compared with the ICPT system without a relay resonator.

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