Abstract
This paper proposes and implements a novel continuously variable-frequency energy-encrypted wireless power transfer (WPT) system for wireless energy security in multi-receiver applications. To prevent wireless energy from being illegally stolen, the proposed chaotic 2-D frequency-and-duration encryption (FDE) technology directly generates well-defended security keys to guarantee energy security. An LCC-compensated transmitter without using a switched-capacitor array is proposed to competently encrypt the wireless energy into burglarproof energy packages, which are decrypted only by authorized receivers. Then, the concept of the static variable capacitor (SVC) is presented to achieve dynamical impedance compensation for wireless energy decryption in authorized receivers with knowledge of security keys. Consequently, the proposed energy-encrypted SVC-based WPT system can flexibly encrypt and decrypt wireless energy packages in a continuous frequency-and-duration adjustment rather than in a discrete way, thus greatly improving energy security performance. Theoretical analysis, computer simulation and experimental results are provided to verify the feasibility of the proposed continuously energy-encrypted SVC-based WPT system.
Highlights
Wireless power transfer (WPT), first proposed by Nikola Tesla, can be traced back to more than one hundred years ago [1]
To guarantee wireless energy security, the concept of energy encryption was proposed to encrypt the wireless energy as the information encryption does, which ensures that only authorized receivers can successfully decrypt and harvest the encrypted wireless energy [9,13]
According to the security keys of the frequency-and-duration encryption (FDE) sequences, delivered from the energy-encrypted transmitter, both operating frequency fm and its duration may chaotically change, and the static variable capacitor (SVC) in the authorized receivers will be rapidly activated for impedance compensation
Summary
Wireless power transfer (WPT), first proposed by Nikola Tesla, can be traced back to more than one hundred years ago [1]. The WPT possesses the key advantages of cordless, spark-proof, better convenience and higher flexibility, and has re-attracted unpreceded attention of consumers, manufacturers and academic researchers [2,3,4] This wireless energy-accessing pattern is gradually improving our conventional plug-in charging pattern and alleviating the limitations of current battery techniques. To guarantee wireless energy security, the concept of energy encryption was proposed to encrypt the wireless energy as the information encryption does, which ensures that only authorized receivers can successfully decrypt and harvest the encrypted wireless energy [9,13] These encryption schemes desire switched-capacitor arrays to discretely adjust the operating frequency and matched capacitance, suffering from discrete adjustment, finite selections and low flexibility.
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