High-accuracy resolver-to-digital conversion via phase locked loop based on PID controller

[摘要] The problem of resolver-to-digital conversion (RDC) is transformed into the problem of angle tracking control, and a phase locked loop (PLL) method based on PID controller is proposed in this paper. This controller comprises a typical PI controller plus an incomplete differential which can avoid the amplification of higher-frequency noise components by filtering the phase detection error with a low-pass filter. Compared with conventional ones, the proposed PLL method makes the converter a system of type III and thus the conversion accuracy can be improved. Experimental results demonstrate the effectiveness of the proposed method.

[发布机构] School of Instrumentation Science and Opto-electronics Engineering, Beihang University, Beijing; 100191, China^1

[效力级别] 无线电电子学

[关键词] Angle tracking;Conversion accuracies;High-accuracy;Higher frequencies;Phase detection errors;Phase Locked Loop (PLL);PID controllers;Resolver-to-digital conversion