Abstract
An automatic stage transition converter for an inductive power transfer system is presented in this paper. An effective control strategy with two working stages of independent energy injection stage and free resonance stage is employed in the proposed converter. With the automatic stage transition strategy, when the frequency of the resonance network changes, the ending time of the free resonance stage is automatically determined. At the same time, the phase angle of the free resonance stage is automatically set as half a resonant cycle. As the stage transition is not triggered by the switches, the switch motion can be executed in advance of the transition moments. Time margins are offered for every switch in the converter, which make the switching moments of the switches flexible and the control simple. Another feature of this converter is that during the energy injection stage, the energy is injected into the inductor independently. Therefore, the input power can be easily regulated by adjusting the energy injection time. A prototype for the converter and the inductive power transfer system was implemented experimentally. From the experimental results, the automatic stage transition and power regulation capability of the proposed converter are verified. The switches all operated at the soft switch condition. When the energy injection time was adjusted from 10 μs to 25 μs, the output power changed from 143 W to 740 W.
Highlights
Wireless power transfer (WPT) technology is a promising approach to deliver power without physical contact and has been widely employed for many applications [1,2,3,4,5]
In order to solve this problem, this paper presents an improved control strategy for the inductance energy injection and free resonance (IIEIFR)
In time interval [t1, t4 ], the system is in the free resonance stage
Summary
Wireless power transfer (WPT) technology is a promising approach to deliver power without physical contact and has been widely employed for many applications [1,2,3,4,5]. Due to such the strong coupling between theand converter and the resonance some problems as high electrical stresses switching losses [20,21].network, these traditional methods may method make the system lose thedivide soft switching condition, whichprocess causes into sometwo problems Another of power control is to the energy transmission stages: such as high electrical stresses and switching losses [20,21]. Energy injection stage and free resonance stage Through this method the power can be controlled by the switching frequency of the converter should match the resonant frequency of the resonant the cycle number of the injection and freeatresonance stagecondition.
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