Enhanced Power Transmission for on-Road Agv Wireless Charging Systems Using a Current-Optimized Technique

Abstract

This paper provides a sound wireless power transfer (WPT) recharging solution for onroad automated guided vehicle (AGV) system. In this solution, multiple transmitting coils serve as power transmitters (TXs), and a receiving coil in AGV serves as a power receiver (RX). The multiple TXs are along a straight track for dynamic charging to AGV. The circuit model of multiple-TX and single-RX WPT system is first constructed based on circuit theory (CT), and then current-optimized scheme based on Lagrangian multiplier method is proposed to tune the currents in multiple TXs to maximize the power delivered to the load (PDL). The equal current (EC Case) flowing through each TX is compared with the optimal current (OC Case). Through contrastive analysis, the OC Case shows its advantages in PDL. Finally, the theoretical analysis results are confirmed by the results of full-wave electromagnetic simulation.

A Comparative Study on Current- and Voltage-Optimized Circuit Scheme for Multiple-Transmitter and Single-Receiver WPT System

“…All the diameters and the turn numbers of TXs and RX are 31 cm and 25, respectively. We use a 1.2 mm diameter copper wire with electrical conductivity of 5.7×10 7 S/m to wind the power transmission coils, the selfinductance and parasitic resistance values of which are L T � L R � 40.55 μH and r T � r R � 1.96 Ω according to theoretic calculation [14,24]. e series capacitors of C T � C R � 625 pF are connected to coils to achieve the resonance frequency f 0 � 1 MHz (ω 0 � 6.28×10 6 rad/s).…”

“…e series capacitors of C T � C R � 625 pF are connected to coils to achieve the resonance frequency f 0 � 1 MHz (ω 0 � 6.28×10 6 rad/s). Figure 2 illustrates the model setup for a maximum of five TXs and a single-RX WPT system [14], which is also investigated in this paper. e parameters of D I , D M , and D T are the interval distance between TXs, the offset distance from RX to TX 3 , and the transmission distance between TXs and RX, respectively.…”

“…In the multiple-RX scenario, the system of a single charging platform supplying power to multiple devices has been extensively studied by many researchers [8][9][10]. Some approaches using multiple TXs to transfer more power to a single RX have been studied in [11][12][13][14]. In methodology, the early analysis approach of the magnetic coupling WPT system was the coupled-mode theory (CMT) [1,4,15].…”

“…e CT analytical method and the multiple-TX and single-RX wireless charging system are applicable to the dynamic charging scenario [14,22,23]. e current-optimized scheme based on the Lagrange multiplier method in [14] is proposed to tune the currents in multiple TXs to maximize the PDL for the automated guided vehicle (AGV) dynamic charging. Reference [22] focuses on the methods of active charging area determining and output power control to obtain a stable output power for wirelessly dynamic charging EV system.…”

Calculation and analysis method of AGV dynamic and economic performance

“…The dynamic performance and economic performance of AGV are important performance indexes. M. De Ryck put forward the energy management optimization scheme of AGV [3], and Jin Zhang proposed a wireless charging solution for AGV [4]. However, there are few researches on the dynamic performance and economic performance of AGV.…”