Fuzzy based directional tuning controller for a wireless power pick-up

Abstract

The present study proposes a simple fuzzy PID controller combined with directional tuning control for regulating the output voltage of a wireless power pick-up. The output voltage is controlled by changing the equivalent inductance of a magnetic amplifier by a suitable value. Accurately determining the step-size of the inductance variation is an important task of this research to enable satisfactory control. The proposed controller essentially regulates the output power with logical step changes of the inductance of the magnetic amplifier, which allows the power pick-up to achieve full-range tuning/detuning operation in maintaining the output voltage to be constant. The effectiveness of the proposed controller has been verified by simulation study under a variety of conditions, and superior results have been obtained compared to a classical directional tuning controller which modifies the equivalent inductance by a fixed step-size. Index Terms-Contactlesspower transfer, Fuzzy control, Magnetic amplifier, Power flow control, Resonant power converter, Wireless power transfer.

Directional Tuning Control of Wireless/Contactless Power Pickup for Inductive Power Transfer (IPT) System

“…Although the chattering effect can be reduced by using smaller step change in the inductance, it causes the overall response to be sluggish. To overcome the difficulties associated with the chattering problems and to make the overall response fast, a fuzzy logic controller is integrated with the classical DTC algorithm to further improve the performance of the controller (Hsu et al, 2008). The objective of the fuzzy logic controller is to dynamically determine the step change Δh of the tuning inductance in (10).…”

Robust H_∞ output feedback control of bidirectional inductive power transfer systems

“…In the past, most IPT systems have utilised various types of controllers including directional tuning, fuzzy, bit-stream and simple PI and PID controllers as a means of verifying a model or particular control strategy [7,6,9,10,8,12,13,31,32]. These controllers give sub-optimal performance if not correctly tuned and are vulnerable to system disturbances and parametric variations which are prevalent in such systems.…”

Output voltage control of inductive power transfer system based on extremum seeking control

“…Generally speaking, the power handling capability of the IPT system can be enhanced through either series or parallel compensations and, as such, this system usually operates as high order resonant circuits and at high frequency in the range of 10-50 kHz [7,8]. Difficulties in the control of IPT system can arise from several factors, which include but not limited to load and system parameter variations, very high operation frequency, strong non-linearity and discreteness [8][9][10][11][12][13][14].…”

“…Recently, many IPT control techniques have been proposed with different levels of complexity, robustness and flexibility, such as directional tuning control (DTC) [8], proportional-integral (PI) control [9], genetic algorithm (GA) optimised PID control [10], robust control method [11], adaptive sliding-mode control [12] and fuzzy logic-integrated DTC [13,14]. However, these control techniques in [8][9][10][11][12][13][14] use constant controller parameters after the controller design. Therefore, it is difficult for these controllers to deal with unmeasured disturbances, system parameter variations and operation state changing.…”