Abstract
This article proposes a design procedure for power loss shifted inductive energy transfer systems. Based on adequately simplified mathematical circuit models for four different compensation topologies, the load dependent losses of the respective resonant circuits are presented. Power loss shifting is achieved for transfer coils and their compensation capacitors by adjusting the design operating area of the transfer system. As a result, this leads to asymmetrical reactive power and loss distribution on primary and secondary side. Design equations for coil systems and compensation capacitors with predictable transfer and loss behavior are provided. Strategies and equations for the determination of the operating area are given. The procedure can be adapted to many kinds of applications where power losses on either primary or secondary side of an inductive energy transfer system are key to be avoided and further miniaturization needs to be achieved. This strategy offers an additional degree of freedom that can be taken into advantage regarding the reduction of thermal heating or miniaturization efforts. A comparative metrological validation for the application of transcutaneous energy transfer shows that the losses of the secondary implanted components can be drastically reduced with the drawback of a decreased efficiency of the overall system.
Highlights
The emerging interest in inductive energy transfer systems has led to mature developments for many technical applications
Several applications demand additional requirements and efforts in development. These include the supply of high power implanted medical devices [7], [9], charging of electric vehicles [15], [23], or the contactless excitation of electrical machines’ rotors [17], [18], [20]
It is shown that power loss shifted designs from primary to secondary side or vice versa are feasible while the fundamental transfer behavior remains unchanged, concurrently
Summary
The emerging interest in inductive energy transfer systems has led to mature developments for many technical applications. Various publications present the design of inductive energy transfer systems with respect to the maximization of the overall efficiency for a specific load condition [2], [11], [12], [16], [21], [24]. From (19)–(22), it becomes evident that the losses in the coils and in the capacitors increase on both primary and secondary side when operating the system with ωr or ωr since these resonance frequencies only exist for CR > 1.
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