Abstract
This paper compares the electrical characteristics of the S-P type and the repeating coil type wireless power transfer (WPT) system. The features of the two types of WPT systems are described if the output power is same value using the same coil model. The current and voltage values of resonance capacitor are high, and the output power decrease when misalignment of coil occurs. Therefore, compensation method for misalignment is investigated to suppress this burden of resonance capacitor when misalignment of coil occurs. These results are calculated from circuit equations based on the results of electromagnetic analysis and are investigated for automatic guided vehicle (AGV) applications. Thus, if the repeating coil maintains the center position between the primary and secondary coils, the repeating coil type can suppress the burden of the resonance capacitor and improve the transmission power.
Highlights
The wireless power transfer (WPT) system has been researched for various applications, such as electric vehicles (EV)
The circuit configuration of the S-P type WPT system is commonly used for EV applications, which has two resonance capacitors: one is connected in series with the primary coil, and the other is connected in parallel with the secondary coil
An advantage is that the efficiency of the repeating coil type can be kept high even when misalignment occurs
Summary
The wireless power transfer (WPT) system has been researched for various applications, such as electric vehicles (EV). The circuit configuration of the S-P type WPT system is commonly used for EV applications, which has two resonance capacitors: one is connected in series with the primary coil, and the other is connected in parallel with the secondary coil. It is difficult to compare the electrical characteristics in the same condition, because all the types have different features, circuit configurations, and coil shapes. Compensation method is investigated to suppress this burden of resonance capacitor when misalignment of coil occurs. These results are calculated from circuit equations based on the results of electromagnetic analysis and are investigated for automatic guided vehicle (AGV) applications. We investigate the electrical characteristics, compensation method, and the burden of the capacitor, when the repeating
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