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2022-08-11
Wireless Power Supply Voltage Regulation Control of Implantable Devices Based on Primary Side MPC
By
Progress In Electromagnetics Research C, Vol. 122, 183-198, 2022
Abstract
The wireless power transfer (WPT) system for implantable medical devices has the problem that the output voltage is difficult to adjust stably in real time without using additional composite compensation topology and dual-side communication. A primary side control method of WPT system based on a phase shifted full bridge inverter and continuous control set model predictive control (MPC) is proposed. First, the series-series (SS) structure parameters and fundamental harmonic analysis (FHA) are used to derive the estimated value of the output voltage and establish the output voltage prediction model of the system. Then, to obtain the best response of the system, the optimization problem in the controller is transformed into the problem of solving the minimum value of the cost function, and the optimal control variable is obtained limited below the gradient descent method. Simulated and experimental results show that the control system works at a frequency of 200 kHz to realize real-time voltage adjustment, and the steady-state error is within 2%. Compared with the traditional method, the method reduces the adjustment time by 5-10 ms, and voltage overshoot is reduced by 5.3-6.7% when interference factors are dealt with such as load interference and mutual inductance. The proposed method improves the performance of SS compensated WPT systems to be more suitable for the applications that require compact and light weight receiver. It provides an effective method to realize the real-time regulation of the system output voltage.
Citation
Weihua Chen, Jiawei Song, and Xiaoheng Yan, "Wireless Power Supply Voltage Regulation Control of Implantable Devices Based on Primary Side MPC," Progress In Electromagnetics Research C, Vol. 122, 183-198, 2022.
doi:10.2528/PIERC22060701
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