Dynamic IPT System Operating Under Bifurcation Phenomenon for Reducing Output Power Pulsation

Abstract

In a dynamic inductive power transfer (D-IPT) system, significant variations in magnetic coupling occur as the secondary coil moves along the roadway above the primary coils. These variations significantly impact the output power pulsation and result in low power efficiency. This article introduces the concept of a D-IPT system operating under the bifurcation phenomenon that achieves coupling-independent and load-independent output characteristics by tracking the new zero phase angle (ZPA) frequency. The series-series (SS) topology was chosen as the IPT system can control the secondary current via the input current under the bifurcation phenomenon. Furthermore, the proposed circuit configuration on the primary side eliminates the high-power loss associated with SS topology within non-coupling primary coils (the primary coils are not synchronized with the vehicle) at the new ZPA frequency under the bifurcation phenomenon. The experimental results from the hardware prototype illustrated that the output power at the secondary side remained relatively constant, around 200 W. This was achieved by regulating the secondary current via the input current throughout the experimental distance.

Keywords

• Dynamic inductive power transfer
• bifurcation phenomenon
• output power pulsation