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

Abstract

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.

A Fractional-Order Resonant Wireless Power Transfer System With Inherently Constant Current Output

“…Near-field magnetic-coupling resonant wireless power transfer (WPT) is a promising alternative to traditional wired power transfer, because of its flexibility, safety, convenience [1]. In recent years, WPT technology has been applied in many occasions, such as portable electronic devices, kitchen appliances, implantable medical devices, electric vehicles, lighting application and so on [2]. For the application of constant current load, such as LEDs, batteries and supercapacitors, WPT system is required to have the characteristic of constant current output [3].…”

Fractional-order time-sharing-control-based wireless power supply for multiple appliances in intelligent building

“…Compared with the traditional wired household appliances, the household appliances using the WPT technology have the advantages of high security, high convenience and so on. Combined with the development trend of smart building, wireless home appliances will have a broad market prospect [11] , [12] , [13] , [14] , [15] , [16] , [17] , [18] . The existing applications are all for wireless power supply of single electrical appliance.…”

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

“…Among those WPT types, the magnetic coupling resonance method is the most commonly used, and research on this method is the hottest because it has the advantage of being able to transmit the electricity at a long distance. [40]. In [42], a method of increasing the operating frequency and reducing the volume was developed by using harmonic currents.…”

“…Moreover, a normal function generator and a linear power amplifier were utilized for experimentally verifying the validity of the proposed method. In [39], a method for simultaneously measuring mutual inductance and load resistance of the S-S topology WPT was proposed, in which two action modes were realized by substituting the compensation capacities, and then, mutual inductance and load resistance were solved from two sets of equations.The WPT system mentioned in [40] utilized the S-P (Series-Parallel) topology. Only the data of the transmitter were measured, and these data were decomposed into real and imaginary parts.…”

“…The WPT system mentioned in [40] utilized the S-P (Series-Parallel) topology. Only the data of the transmitter were measured, and these data were decomposed into real and imaginary parts.…”