Abstract
Wireless power transfer (WPT) techniques have gained wide acceptance across a range of battery charging applications such as cell phones, cardiac pacemakers, and electric vehicles. In a wireless battery charging system, a constant current/constant voltage (CC/CV) charging strategy, regardless of the variation of the battery load which may roughly range from a few ohms to several hundred ohms, is typically adopted to ensure the safety, durability, and performance of the battery. However, system efficiency drops significantly as the load increases in CV mode, especially at very light-load conditions. This paper proposes an efficiency optimization method for an LCC-parallel compensated inductive power transfer (IPT) battery charging system without the help of any additional power converter and control method. The equivalent circuit and resonant conditions of the LCC-parallel compensation topology are firstly analyzed to achieve the load-independent CV output at a zero phase angle (ZPA) operating frequency. Over the full range of CV charging mode, the efficiency of the LCC-parallel resonant tank circuit is analyzed and optimized. An IPT battery charger prototype with 48 V charging voltage and 1 A charging current is implemented. A measured DC–DC transfer efficiency of greater than 90.48% is achieved during the whole CV charging profile.
Highlights
Wireless power transfer (WPT) techniques [1,2] provide a safe, reliable, and efficient charging solution for the lithium-ion battery in applications of wearable medical devices, consumer electronics, and electronic vehicles (EVs)
DC–DC transfer efficiency of greater than 90.48% is achieved during the whole constant voltage (CV) charging profile
In view of the aforementioned issues, this paper focuses on the load-independent CV output characteristic with near input unit power factor and the light-load efficiency optimization of an LCC-parallel compensated inductive power transfer (IPT) without any additional power converters, power switches, and control algorithms
Summary
Wireless power transfer (WPT) techniques [1,2] provide a safe, reliable, and efficient charging solution for the lithium-ion battery in applications of wearable medical devices, consumer electronics, and electronic vehicles (EVs). ZPA condition and constant output current or voltage without the helps of any additional converter and control method, designing special resonant condition for the compensation topology in a WPT system is an effective solution [10,11]. For the series-series (SS) compensated inductive power transfer (IPT) system, the primary and secondary compensation capacitors are designed to resonant with the primary and secondary self-inductances, respectively In this case, load-independent CC output at a ZPA frequency can be achieved [12,13]. In view of the aforementioned issues, this paper focuses on the load-independent CV output characteristic with near input unit power factor and the light-load efficiency optimization of an LCC-parallel compensated IPT without any additional power converters, power switches, and control algorithms.
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