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http://dx.doi.org/10.5515/KJKIEES.2018.29.7.484

Error Rate Enhancement Algorithm for 13.56 MHz Impedance Automatic Matching System  

Jang, Kwang-Ho (Department of Wireless Communications Engineering, Kwangwoon University)
Park, Su-Yeon (Department of Wireless Communications Engineering, Kwangwoon University)
Choi, Jin-Joo (Department of Wireless Communications Engineering, Kwangwoon University)
Lee, Dong-Heon (RFPT)
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Abstract
This paper describes an algorithm for calculating load impedance by measuring voltage and current components using a VI sensor in a 13.56 MHz impedance automatic matching system. We propose an algorithm that improves the error rate by using an arbitrary complex calibration load instead of the conventional $50{\Omega}$ calibration load. The error rate is targeted to attain average values of $R_{IN}$ and $X_{IN}$ at 1% and 20% or less, respectively. First, the IF frequency is calculated using a mixer to reduce the error rate. Second, when the arbitrary complex load is used as the calibration load, the error rate $R_{IN}$ decreased from 4.7 % to 0.3 % on average, and $X_{IN}$ decreased from 102 % to 18.3 % on average.
Keywords
13.56 MHz; Impedance Auto Matching System; Vi Sensor; Complex Load Calibration;
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