System conditions monitoring method for a wireless cellular phone charger

Chung, Euihoon; Lee, Jun; Park, Yong Ha

doi:10.1109/peac.2014.7037932

Cited by 12 publications

(10 citation statements)

References 8 publications

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“…ra, rb, rc is the reflected impedance from loop 2 to loop 1, from loop 3 to loop 1, from loop 2 to loop 3, respectively, and they are measured in Equation (13). Based on Figure 3, the transfer efficiency could be derived in Equation (14). , , represent the efficiency of loop 1, loop 2 and loop 3, respectively.…”

Section: Efficiency Analysismentioning

confidence: 99%

“…Based on Equation (12), and the relationship between input voltage and output voltage of the inverter and the rectifier, Equation (17) is derived. Based on Figure 3, the transfer efficiency could be derived in Equation (14). η 1 , η 2 , η 3 represent the efficiency of loop 1, loop 2 and loop 3, respectively.…”

Section: Parameter Value Designmentioning

confidence: 99%

“…For application, IPT technology is largely implemented in biomedical implants, wearable electronics, electric automobiles and rail transport [5][6][7][8][9][10]. Some applications require constant voltage (CV) for charging, for example, mobile phone [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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A Three-Coil Inductively Power Transfer System with Constant Voltage Output

et al. 2018

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For a traditional 2-coil system outputting constant voltage (CV), the transfer efficiency decreases drastically as transfer distance increases. To solve this problem, this essay proposes a 3-coil system which could achieve CV output and Zero Phase Angle (ZPA) conditions with specific parameter values. This 3-coil system could partly relief transfer efficiency fall at a long transfer distance, without any complicated controls. In order to achieve CV and ZPA condition, this essay devises the parameter values based on the decoupling 3-coil model, and a prototype is designed accordingly to verify these characteristics. With 10 cm transfer distance, output voltage deviation is 5.5% as the load varies from 12 Ω to 200 Ω, proving that the output voltage almost keeps constant with load change. Furthermore, with software simulation, a comparison experiment between the proposed 3-coil system and a Series-Inductor-Capacitor-Inductor (S-LCL) compensated 2-coil system is built to verify the efficiency improvement. The transfer distance change leads to the differentiation of voltage gain for both 2-coil and 3-coil systems. So, the input voltage for both systems and the compensated capacitor in receiver loop of the 3-coil system are manipulated for keeping 60 V output voltage on the 12 Ω load. With distance increasing from 10 cm to 20 cm, transfer efficiency varies from 92.61 to 48.9% for the 2-coil system, and from 92.89 to 84.26% for the 3-coil system, effectively proving the efficiency improvement. The experiment and simulation results prove the effectiveness of the proposed method.

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Section: Efficiency Analysismentioning

confidence: 99%

Section: Parameter Value Designmentioning

confidence: 99%

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A Three-Coil Inductively Power Transfer System with Constant Voltage Output

et al. 2018

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“…In order to overcome the inherent problem on these systems, additional communication equipment has been commonly utilized to monitor and regulate output voltage [7]. However, due to the growing demand for miniaturization and cost reduction of receivers, a number of techniques have been studied for monitoring the load conditions and regulating the output voltage without a communication link [8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Cost-Effective High-Performance Digital Control Method in Series-Series Compensated Wireless Power Transfer System

Shin¹,

Chung²,

Park³

2020

Electronics

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This paper proposes a control method for a digital signal processor based series-series (SS) compensated wireless power transfer system. In the control method, load resistance and mutual inductance are identified simultaneously, and output voltage can be estimated by using only the primary side voltage and current without direct feedback from the secondary side circuit. Since this estimation method requires a complex mathematical calculation procedure, a digital signal processor is used in this system. One of the major disadvantages of using a digital controller in this system is a limitation of sampling rates. Therefore, in this paper, several current reconstruction methods with limited sampling rates are investigated and applied. As a result, this controller not only reduces the cost of the system but also shows good estimation performance within the limited digital controller unit resource. The proposed control concept is verified by experimental results with a 48W laboratory prototype.

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“…Moreover, these methods elaborately analyze the characteristic of reflected impedance but require sampling high frequency voltage and current in resonant tank, so an energy analysis method that only utilizes zero crossing sampling data of resonant variables to realize identification of dynamic reflecting impedance is presented in [18], although it requires accurate mutual inductance measurement as well. In addition, other methods such as frequency perturbing are used to estimate load and mutual inductance simultaneously [19].…”

Section: Introductionmentioning

confidence: 99%

Multiple Parameters Estimation Based on Transmitter Side Information in Wireless Power Transfer System

et al. 2019

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Due to the electrical isolation nature of wireless power transfer (WPT) system, a method that can obtain the receiver side parameter only based on transmitter side information is desirable. However, typical estimation scheme assume that the coil inductance and compensation capacitance are constant, which will cause large estimation errors in high frequency system. Therefore, a multiple parameters estimation algorithm that can simultaneously identify load resistance, mutual inductance and receiver coil inductance is proposed in this paper, where only the input current and voltage are needed to be measured. Moreover, in order to cope with capacitor aging effect and manufacturing tolerance, compensation capacitance estimation algorithm is also presented. Mathematical model and algorithm procedure are depicted thoroughly and the gradient descent approach is adopted to obtain the optimal estimated parameter. The uniqueness of solution and the validity of this approach are strictly proved as well. Finally, a WPT experimental prototype with Class-D inverter is implemented and the experimental results are provided to verify the availability and accuracy of the proposed algorithm. INDEX TERMS Wireless power transfer, parameter estimation, gradient descent approach.

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System conditions monitoring method for a wireless cellular phone charger

Cited by 12 publications

References 8 publications

A Three-Coil Inductively Power Transfer System with Constant Voltage Output

A Three-Coil Inductively Power Transfer System with Constant Voltage Output

Cost-Effective High-Performance Digital Control Method in Series-Series Compensated Wireless Power Transfer System

Multiple Parameters Estimation Based on Transmitter Side Information in Wireless Power Transfer System

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