Error Rate Enhancement Algorithm for 13.56 MHz Impedance Automatic Matching System
Kwang-Ho Jang, Su-Yeon Park, Jin Joo Choi, Dong-Heon Lee · The Journal of Korean Institute of Electromagnetic Engineering and Science · 2018
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 Ω calibration load. The error rate is targeted to attain average values of RIN and XIN 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 RIN decreased from 4.7 % to 0.3 % on average, and XIN decreased from 102 % to 18.3 % on average.