Modified parameter tuning method for LCL/P compensation topology featured with load‐independent and LCT‐unconstrained output current

Abstract

Inductive power transfer (IPT) has attracted a lot of attention in recent 30 years due to its advantages of convenience, safety, reliability and weather proof. This study proposes a modified parameter tuning method for primary inductor-capacitorinductor, secondary parallel (LCL/P) compensation topology, which provides the characteristic of excellent constant current output (CCO). This characteristic is analysed on the basis of inductor-capacitor(LC) and capacitor-inductor (CL) resonant tanks. To lower the voltage stresses over capacitors and current stresses through inductors, the stress-based optimisation is conducted. The sensitivity of CCO characteristic with respect to the normalised deviation of compensation parameters is analysed; therefore, the performance of LCL/P compensated IPT system in practical scenarios can be fully understood. The loosely coupled transformer (LCT) is specially designed since it has a significant impact on system efficiency, component stress, power density etc. An exhaustive search algorithm is employed to find the optimal dimensions of the LCT. A 100 W LCL/P compensated IPT prototype is fabricated. The measured end-to-end efficiency, from DC input to DC output, is as high as 92.8%. The output current only increases by 2.02% when the load decreases by half. All experiment results agree well with the theoretical analysis.

Analysis and design of a high‐efficiency three‐coil WPT system with constant current output

“…Then, authors of [20,21] respectively proposes the LC/CC and LC/CL compensation topologies for the CCO to further reduce the compensation components. Moreover, the authors in [22] propose a new parameter tuning approach for LCL/P topology to provide the perfect CCO characteristic and ZPA operation. It is worth emphasising that these schemes in [19][20][21][22] introduce extra compensation components in the receiver, which undoubtedly violates the principle of compactness and lightness of the receiver in wireless charging applications [23,24].…”

Development of compact rapid capacitor charging power supply for TMS

“…The inductor–capacitor–inductor (LCL)‐T RCs exhibit certain merits that make them ideal for constant‐current power supplies. When the circuit is operated under certain conditions, its output current is constant, regardless of load variations [17–19]. The advantages of LCL‐T RC include low conduction loss, low switching loss, and easy parallel operation.…”

Compact pulse position control‐based inverter for high efficiency inductive power transfer to electric vehicle

“…The distance of power transfer is limited by the size and shape of the coil [11][12][13]. Generally, the circular copper coil is mounted on the ferrite spokes in order to enhance maximum flux linkage [14][15][16]. This higher order decoupled circuit creates resonance to transfer power from one circuit to the other with a larger air gap [15].…”