Abstract
This paper proposes an on-line method for foreign object detection in a double DD coil system. The foreign object is detected by real-time measurement of the mutual inductance between the transfer pads. Measurement of the mutual inductance between coils can be performed at the start, during initialisation, or during the wireless power transfer. The coils in the double DD coil structure can be used separately; one coil can be used for power transfer and the other can be used for the mutual inductance measurement. The mutual inductance measurement is based on the voltage measurement across the open circuit receiver coil. The measured value of mutual inductance between the transmitter and the receiver pad can be used in a control algorithm and in a foreign object detection algorithm. Additionally, a 2DDq coil structure can be used as a replacement for the double DD coil structure, which increases the power transfer density. The DD coils in the double DD coil structure can also be driven using two phase-shifted voltages, which enables better location and detection of foreign objects. The method also helps to differentiate the mutual inductance change due to the distance change from the mutual inductance change due to the presence of a foreign object.
Highlights
Introduction an Inductive Wireless Power TransferResearch in the field of wireless power transfer (WPT) received more interest due to the rapid development of the mobile and automotive fields [1,2,3,4]
The conventional wireless transfer system transfers power between a transmitter and the receiver side, which can be separated by a distance that can range from a couple of millimetres to a couple of metres
The wireless power transfer system described in this paper consists of a transmitter and a receiver with a special coil structure, called a double DD coil structure
Summary
Research in the field of wireless power transfer (WPT) received more interest due to the rapid development of the mobile and automotive fields [1,2,3,4]. The conventional wireless transfer system transfers power between a transmitter and the receiver side, which can be separated by a distance that can range from a couple of millimetres to a couple of metres. The most popular of these is IPT, which is usually used in medium ranges, from a couple of centimetres to a couple of decimetres, and enables power transfer up to several kWs [6]. The main advantages of WPT are its robustness and ease of use compared to conventional wired power transfer. The wireless power transfer introduces several new problems, its lower and position dependent efficiency and increased system complexity
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