A Load-Independent Wireless Power Transfer System With Multiple Constant Voltage Outputs

Constant Voltage Design Using <i>K</i>-Inverter for Cooperative Inductive Power Transfer

“…Recently, several methods have been proposed to realize cooperative IPT systems with load-independent output voltages [26,27]. For these methods, each of the transmitter and the distant receiver was equipped with one coil while the nearby receiver was equipped with two coils, namely the receiving coil and the transmitting coil.…”

“…There-fore, the stability of the load voltages over load variations would be sensitive to the misalignment of the coils. In contrast, the compensation scheme in [27] was designed regardless of the mutual inductance between the coils. For the method in [27], the distant receiver was compensated by series capacitor while each of the transmitter and the nearby receiver was compensated by the combination of series capacitor and capacitorinductor-capacitor (CLC) topology.…”

“…In contrast, the compensation scheme in [27] was designed regardless of the mutual inductance between the coils. For the method in [27], the distant receiver was compensated by series capacitor while each of the transmitter and the nearby receiver was compensated by the combination of series capacitor and capacitorinductor-capacitor (CLC) topology. Accordingly, the load carried by the nearby receiver would consume a part of the power transferred from the source through two K-inverters formed by the CLC topology of the transmitter and by the coupling between the transmitter and the receiving coil of the nearby receiver.…”

“…This is among the simplest structures to supply constant voltages to all the loads. Meanwhile, the method in [27] delivered constant voltages to the nearby receiver via two K-inverters and to the distant receiver via four Kinverters as mentioned above. Moreover, our previous evaluation [30] highlighted that our design using CLC topology could satisfy the requirement of constant load voltages while achieving higher transmission efficiency than the method in [27].…”

Design of a highly integrated wireless power transfer system

“…It is attractive to transmit energy in a contactless way, and the environment can be more convenient and green by avoiding the usage of electric wires. However, for a typical WPT system, the performance is usually influenced by many factors including load status, coil layout, coupling coefficient, operating frequency, and axial offset distance 10–16 . Hence, it would be complicated to transfer energy over a certain distance or even a varying distance, especially if it wants to maintain high power or high efficient energy transmission.…”