Abstract
This paper compares the electrical characteristics of S-P (Series - Parallel) type with those of a repeating coil type wireless power transfer (WPT) system. The features of the two types of WPT systems are described for same output power using a same coil model. In general, the misalignment of power transmitting and receiving coils causes an output power to decrease using resonance capacitors with large operations current and voltage. From the viewpoint, a compensation method for the misalignment is investigated to reduce this burden of the resonance capacitor. Simulation is made on electrical characteristics such as output power and power transfer efficiency of a proposed WPT system applied to automatic guided vehicle (AGV) based on an equipment circuit combining results of electromagnetic analysis. As a results, it is found that a repeating coil keeping the center position between the primary and secondary coils can suppress the burden of the resonance capacitor so as to improve the transmission power of WPT system.
Highlights
In recent years, wireless power transfer (WPT) system has been researched for various applications, such as electric vehicles (EV) and automatic guided vehicles
Simulation is made on electrical characteristics such as output power and power transfer efficiency of a proposed WPT system applied to an automatic guided vehicle (AGV) based on an equipment circuit combining the results of an electromagnetic analysis
This paper compares the electrical characteristics of S-P (Series - Parallel) type with those of a repeating coil type wireless power transfer (WPT) system
Summary
Wireless power transfer (WPT) system has been researched for various applications, such as electric vehicles (EV) and automatic guided vehicles. We investigate the electrical characteristics, compensation method, and the burden of the capacitor, when the repeating coil maintains its position at the center between the primary and secondary coils. If the repeating coil position is controlled at the center between the primary and secondary coils, the output voltage can be maintained at constant with the input voltage Vin. the simulation on the electrical properties of the repeating coil type was made without the resonance capacitor C2, as reported in the previous investigation [12] where the WPT system used repeating resonance capacitor but secondary resonance one. Electrical characteristics of the S-P type and repeating coil type WPT system have not compared in detail under the condition that the repeating coil is controlled at the center of the primary and secondary coils intentionally. The simulation was performed with the same output power, meaning that the repeating coil type needs an inverter providing high voltage than the S-P type
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