Front-End Monitoring of the Mutual Inductance and Load Resistance in a Series–Series Compensated Wireless Power Transfer System

Yin, Jian; Lin, D.; Parisini, Thomas; Hui, S. Y. Ron

doi:10.1109/tpel.2015.2509962

Cited by 145 publications

(73 citation statements)

References 17 publications

(16 reference statements)

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“…In order to regulate the output power based on primary-side control method, the load resistance and mutual inductance must be identified throughout the operation. Previous research effort on load resistance and mutual inductance identification utilizing only the primary-side measured variables have been reported in [28][29][30]. The identification method of the load impedance and mutual inductance in steady-state is presented in [28].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, it is difficult to implement and time consuming. In [30], load resistance and mutual inductance can be estimated simultaneously by the measurement of input voltage and current. Unfortunately, the estimation fails at the resonant frequency due to a mathematical problem.…”

Section: Introductionmentioning

confidence: 99%

“…This method measures only the primary current. The issue of operation at the resonant frequency as in [30] has been addressed. The performance of the proposed MPC is compared with conventional PI control via the experiment of output power step response.…”

Section: Introductionmentioning

confidence: 99%

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A Novel Output Power Control of Wireless Powering Kitchen Appliance System with Free-Positioning Feature

et al. 2018

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To achieve a free-positioning wireless power transfer (WPT) system, the output power must be regulated throughout the operation. This paper presents a novel output power control of a WPT system, based on the model predictive control (MPC). The output power is predicted by utilizing the system's mathematical model. The optimal duty cycle for a desired output power is obtained through the minimization of the objective function, which is simple and easy to implement, with no need for gain tuning. The proposed controller is implemented on the primary side, without any measurement or communication devices on the secondary side. This reduces the cost, size, and complexity of the WPT system. The load resistance and mutual inductance identification method is also introduced. It is based on the reflected impedance knowledge, where only the information of primary current is required. Experimental results of the output power step response show better performance compared with conventional Proportional-Integral (PI) control. The proposed controller is experimentally validated on a 200 W kettle. The output power can be kept constant at 200 W while the kettle is laterally moved. With the proposed controller, the kettle can be placed freely up to 7 cm from the align position, which is 63.64% of the primary coil's outer radius.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Novel Output Power Control of Wireless Powering Kitchen Appliance System with Free-Positioning Feature

et al. 2018

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“…In addition, the continuous and discontinuous operation modes will influence the accuracy of the modeling. Reference [24] also studies the identification of mutual inductance and load resistance. These two parameters can be calculated under one operating frequency condition with the front-end monitoring method.…”

Section: System Topologymentioning

confidence: 99%

A Maximum Power Transfer Tracking Method for WPT Systems with Coupling Coefficient Identification Considering Two-Value Problem

Dai

et al. 2017

Energies

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Maximum power transfer tracking (MPTT) is meant to track the maximum power point during the system operation of wireless power transfer (WPT) systems. Traditionally, MPTT is achieved by impedance matching at the secondary side when the load resistance is varied. However, due to a loosely coupling characteristic, the variation of coupling coefficient will certainly affect the performance of impedance matching, therefore MPTT will fail accordingly. This paper presents an identification method of coupling coefficient for MPTT in WPT systems. Especially, the two-value issue during the identification is considered. The identification approach is easy to implement because it does not require additional circuit. Furthermore, MPTT is easy to realize because only two easily measured DC parameters are needed. The detailed identification procedure corresponding to the two-value issue and the maximum power transfer tracking process are presented, and both the simulation analysis and experimental results verified the identification method and MPTT.

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“…Similar to [36], the load resistance and mutual inductance cannot be derived at the same time. A method for simultaneously measuring mutual inductance and load resistance of the S-S (Series-Series) topological WPT was proposed in [38]. The frequency scanning was performed near the resonant frequency, and then, the mutual inductance and load resistance were solved from these frequency equations.…”

mentioning

confidence: 99%

A Method of Estimating Mutual Inductance and Load Resistance Using Harmonic Components in Wireless Power Transfer System

et al. 2019

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In general, for the WPT (Wireless Power Transfer) system, as the mutual inductance and load resistance are calculated according to the measured data of both the transmitter and receiver, the wireless communication modules are needed to share data. A method for estimating mutual inductance and load resistance without wireless communication is proposed, based on the fundamental and third harmonic components. The circuit is decomposed with respect to the frequencies, by which the mathematic model is established. The fundamental and harmonic components of the output voltage and current of a high-frequency inverter are found by FFT (Fast Fourier Transform). The experimental WPT system with a SiC power MOSFET is designed, and the effectiveness of the proposed method is verified by the simulation and experiment results. Additional hardware and frequency scanning operation are not needed because of the use of the harmonic components.Generally, the Magnetic Resonance Coupling Wireless Power Transfer (MRC-WPT) system consists of three parts, namely a high-frequency power supply, a coil set (transmitting and receiving coil; some systems may have more than one intermediate coil in the coil set), and a receiver circuit. The coupling coefficient (or mutual inductance) between the coils and the load resistance are directly related to the performance of the system (for example, efficiency, transfer power, etc.) [29][30][31].The measured data of the load voltage and/or current of the receiver are transferred to the transmitter through wireless communication, and these data take part in realizing the constant current, constant voltage, or constant power of the load.In [32,33], the methods for keeping the constant voltage of the load were represented using the communication module. In [34], the method for maintaining the constant voltage and the current of the load was realized using the communication module. It was implied that the relative position between the transmitter and the receiver moved infrequently, and the internal resistance of the battery was very slowly changed when charging the battery of an electric vehicle, then the concept of the weak communication was defined. In spite of the communication environment being unstable, the load resistance and mutual inductance could be derived, but the communication function was not completely removed from the system. Due to the use of the wireless communication module, the power consumption may be increased, and the normal communication function cannot be performed in some severe situations. It is more unacceptable that if only one of the communication modules among the transmitter and the receiver is damaged, the whole WPT system cannot be operated. In [35], a method in which power and data were transferred at the same time through only one coil was proposed.If the load voltage and/or current can be estimated without any measured data of the receiver, the difficulties mentioned above do not need to be considered; while, if the inductance and capacitance of the receiver (L 2 , C ...

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Front-End Monitoring of the Mutual Inductance and Load Resistance in a Series–Series Compensated Wireless Power Transfer System

Cited by 145 publications

References 17 publications

A Novel Output Power Control of Wireless Powering Kitchen Appliance System with Free-Positioning Feature

A Novel Output Power Control of Wireless Powering Kitchen Appliance System with Free-Positioning Feature

A Maximum Power Transfer Tracking Method for WPT Systems with Coupling Coefficient Identification Considering Two-Value Problem

A Method of Estimating Mutual Inductance and Load Resistance Using Harmonic Components in Wireless Power Transfer System

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