Abstract
This paper presents an inductive power transfer system on the basis of a double single-phase three-level T-type inverter and two split transmitting coils for constant current and constant voltage wireless charging of low-voltage light electric vehicle batteries with closed-loop control, considering time-delay communication constraints. An optimal control structure and a modified control strategy were chosen and implemented to the wireless power transfer system as a result of a review and analysis of existing solutions. The control system analysis and adjustment of the coefficients of the regulator using Laplace transform were performed. Our study addressed the behavior of the control system with different time delays as well as the dynamic response of the system. The detecting algorithm of a secondary coil was proposed, which ensured efficient system operation and increased the functionality, safety and usability of the device. The efficiency of energy transfer of 90% was reached at the transmitted power of 110 W, which is at the level of existing solutions considered in the article and opens the way to the commercialization of the proposed solution. Therefore, the feasibility of using a nonclassical multilevel inverter, together with split transmitting coils for wireless charging was confirmed.
Highlights
Control systems based on various strategies are an integral part of the wireless power transfer (WPT) system for efficient energy transfer and overall circuit operation
The output of the second controller is used as the value at which the refvoltage Vbat and the current Ibat are acquired via voltage and current sensors and sent to erence current Irefc should be decreased to obtain necessary output voltage (Figure 10b,c). Such an approach is more convenient than the separate usage of controllers for constant current (CC) and constant voltage (CV) modes, as in this case, the CC controller is working during all operation modes and maintains the dynamics of the system on one level
The main contribution of this study is the development of a simple closed-loop control system with time-delay constraints for a wireless charger of low-voltage energy storage devices of low-power electric vehicles
Summary
Control systems based on various strategies are an integral part of the wireless power transfer (WPT) system for efficient energy transfer and overall circuit operation. Delays in the transmission of information over the wireless network are a topical issue [2] and can lead to disruptions of the WPT control process. This article presents a study and justification theinrange ofthe denormal operation of the wireless charging system is possible. Forcomthis munication delay is taken into account the transfer function of WPT purpose, the communication delay is when takenanalyzing into account when analyzing thethe transfer system with a closed-loop control system.
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