Abstract
A novel LC-LC2 compensated resonant converter topology with high efficiency and good controllable voltage gain is presented in this paper. An additional receiving side inductor working together with the receiving coil has the contribution to work with a large range of air gap distance. Due to this property, proposed compensation technique is effective for IPT based EV charging application. Voltage gain with independent of load and input impedance having ZPA of the proposed resonant converter are observed by the frequency domain analysis. On the other hand, time domain analysis gives the circuit operation. A 500 W LC-LC2 compensated resonant converter prototype is built to testify the theoretical analysis. To observe the efficiency-comparison, an S-SP compensated resonant converter with a similar amount of output power under different air gap is also presented. In order to justify the effectiveness, the proposed compensation method is verified by the laboratory results. The highest efficiency of the proposed compensated resonant converter is 93% with output power of 500 W at 140-mm air gap between the two sides of the IPT (inductive power transfer) transformer.
Highlights
Technology of inductive power transfer (IPT) delivers power to the utility load via magnetic coupling, is more suitable and versatile energy transfer method in comparison with traditional methods
Due to the low maintenance cost and highly reliable operation, IPT system is more popular for a large area of applications including battery charging of electric vehicles [1,2,3,4], home appliances [5], biomedical treatments [6,7] and other areas associated with industries [8]
At a frequency of load independent voltage gain, input impedance with ZPA and high power transfer efficiency can be obtained in S-SP compensated resonant converter [18]
Summary
Technology of inductive power transfer (IPT) delivers power to the utility load via magnetic coupling, is more suitable and versatile energy transfer method in comparison with traditional methods. S-P compensation provides input impedance with ZPA at a frequency of load independent voltage gain [16]; this technique is suitable for high power applications like [26]. In [28], a series-parallel LCL tuned unity pick up was presented, that provides uninterrupted power though it reflects reactive power to the source [29] Another compensation topology with high efficiency named LCC was used in the areas of EV (electric vehicle) charging [23,27]. At a frequency of load independent voltage gain, input impedance with ZPA and high power transfer efficiency can be obtained in S-SP compensated resonant converter [18]. A novel LC-LC2 compensation network for IPT system is proposed in this paper which provides input impedance with ZPA and high efficiency at a frequency of load independent voltage gain like S-SP compensated resonant converter.
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