![]() In order to increase the power transferred, the magnetic flux leakage must be addressed. ![]() Under coil misalignment, the magnetic field leakage increases, and the lower portion of the magnetic flux is received by the Rx. A similar effect is also caused by misalignment between the Tx and Rx. The larger the distance, the lower the power transfer could be observed. This paper deals with the IPT technology, where the power transfer capacity is significantly influenced by the distance between the primary coil-the transmitter (Tx) and the secondary coil-the receiver (Rx). IPT has become a popular and mature technology in industrial applications like Automatic Guided Vehicle (AGV), electronic devices charging, electrical vehicle charging, biomedical implants, lighting systems, and many other applications. The near-field WPT technology could be classified as Inductive Power Transfer (IPT) or Capacitive Power Transfer (CPT). This energy transfer technique offers simplicity, portability, and safety. The energy is transferred from the primary side to the secondary side by using the electromagnetic field. Compared with transferring power through direct connections of wires and cables, wireless power transfer utilizes the interaction among the primary side, the secondary side and the alternating electromagnetic field for power delivery. Since the late 19 th century, when the concept of transferring power without wires was proposed by Tesla, Wireless Power Transfer (WPT) has been developed greatly from thoughts in the brain to practical applications in electronic devices, industrial equipment, electrical vehicles and many other electrical fields. The results from theoretical calculation and simulation align well with each other. The tuned system is shown to be able to provide about 32 W under 100 kHz operating frequency for charging the battery of a robot vacuum cleaner. Furthermore, two types of co-simulations defined by the power source via Simplorer are conducted to explore how much power could be transferred. The comparison indicates the enhancing feature of the passive power repeaters on coupling performance and the ability to guide the magnetic flux for better magnetic field coupling. Three typical IPT designs have also been simulated in ANSYS Maxwell and compared with the proposed magnetic design. The self-inductance, mutual inductance, and coupling coefficient of the proposed system are obtained via finite element method simulation with variable rotating angles. The input and output power are calculated by analyzing the equivalent circuit model. ![]() Two power repeaters share the identical structure as the Tx coil and could be rotated to mirror symmetrically. In this paper, two adjustable power repeaters are applied to an IPT charging system with various curved receiving coils designed for vacuum cleaners. The interaction of these three topics could be inspiring. Power repeaters are also used in IPT systems to extend wireless charging range by guiding magnetic fields to the receiving coil. Inductive Power Transfer (IPT) systems based on curved coils and flexible ferrite sheets may provide more flexible charging solutions for various electronic devices such as rice cookers and robot vacuum cleaners. Curved coils constructed by flexible printed circuit board (PCB) or hand-wound Litz-wire have been steadily becoming popular due to its applicable potential on devices that have a curved body.
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