Use of Transmitter-Side Electrical Information to Estimate Mutual Inductance and Regulate Receiver-Side Power in Wireless Inductive Link

Chow, Jeff Po-Wa; Chung, Henry Shu-Hung; Cheng, Chun Sing

doi:10.1109/tpel.2016.2530816

Cited by 88 publications

(42 citation statements)

References 26 publications

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Section: Protectionmentioning

confidence: 99%

“…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%

“…This increases the component counts, cost, and complexity of the WPT system. The online estimation method presented in [29] is based on the Goertzel algorithm and the mean-squared errors corresponding to all mutual inductance values are evaluated. This method requires a high computational effort.…”

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: Protectionmentioning

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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“…The feedback information from the receiver side will be fully taken into account in the primary-side control methods [23]. Chow et al [24] propose that secondary-side information can be estimated in the transmitter side. Besides, Chan and Chen [25] show that the information required for the primary-side control method is determined by estimating the variation of the reflection impedance.…”

Section: Introductionmentioning

confidence: 99%

Three‐coil structure‐based WPT system design for electric bike CC and CV charging without communication

Liu

Yang

2019

IET Electric Power Applications

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In comparison with the traditional plug-in charging systems for the electric bike (EB), wireless power transfer (WPT) systems have superior advantages of convenience and safety. Combining the application requirement range of the EB, this study proposes a three-coil structure-based WPT system in order to achieve ideal and reliable constant current (CC) output and constant voltage (CV) output without the need for a sophisticated control strategy and the real-time communication links between the transmitter and receiver sides. Two ac switches are utilised at the transmitter side to implement the change of charging mode from CC to CV. By correctly selecting the parameters of compensation components, the required loadindependent CC and CV characteristics with zero phase angle in the CC and CV modes can be achieved. Besides this, a load identification method based on the active power calculation used to estimate the equivalent resistance of the battery in the whole charging process, is utilised to judge the switching point from CC to CV mode. Finally, the feasibility of the method is verified through the construction of a laboratory platform with a 3.3 A charging current and a 57 V charging voltage.

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“…Therefore, it can only be effective when the coupling is strong. The study [10] estimates the Rx side parameter by a curve fitting technique which fits the measured voltage and current at the Tx side to the equivalent circuit model. A frequency domain analysis of the Tx current is proposed in [11].…”

Section: Introductionmentioning

confidence: 99%

Optimal Excitation of Multi-transmitter Wireless Power Transfer System without Receiver Sensors

Jayathurathnage

2019

2019 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)

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The optimal excitation of multi-transmitter wireless power transfer systems is dependent on the position of the receiver (Rx). To maximize the output power and efficiency, the transmitter (Tx) coils closer to the Rx should have higher currents compared to the ones farther away. This paper presents a simple approach to determine the optimal excitation of individual Tx without using any measurement at the Rx side. The Tx coils are arranged to be uncoupled from adjacent Tx coils. In this configuration, the optimal current distribution in each Tx coil is a function of the mutual inductances of each Tx-Rx coil pair, which can be evaluated by analyzing the voltage measurements at Tx coils. The proposed approach is experimentally verified using a laboratory prototype.

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Use of Transmitter-Side Electrical Information to Estimate Mutual Inductance and Regulate Receiver-Side Power in Wireless Inductive Link

Cited by 88 publications

References 26 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

Three‐coil structure‐based WPT system design for electric bike CC and CV charging without communication

Optimal Excitation of Multi-transmitter Wireless Power Transfer System without Receiver Sensors

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