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논문 기본 정보

자료유형
학술대회자료
저자정보
Wangyun Won (Sogang University) Kwang Soon Lee (Sogang University) Sang Hyun Ji (Asia Pacific Systems Inc.)
저널정보
제어로봇시스템학회 제어로봇시스템학회 국제학술대회 논문집 ICCAS 2010
발행연도
2010.10
수록면
469 - 474 (6page)

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초록· 키워드

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A constrained iterative learning control (ILC) technique based on a delta-form linear quadratic Gaussian (LQG) technique has been designed for overcoming model error and for numerically stable control of a rapid thermal processing(RTP). The RTP is characterized by very short sampling time and repetition of single batch. The delta form LQG control technique was applied for accurate control in high frequency caused by short sampling time. The designed control technique, ILC, acquired both numerically stable and to overcome model error in combination with the multivariable delta form LQG technique. A structural problem of the equipment or an excessive model error may cause physically unreasonable solution computed by the delta form LQG. For this, Constraints were applied to the ILC solution to be placed on the physically reasonable area. Cubic spline approximation was used as a numerical method to approximate time-varying gain matrices. The method remarkably reduced not only a computation time, but also a data transmission time from computer to DSP board in RTP equipment. In the results of simulation, control performance was improved from batch to batch, and finally reached specification-satisfied wafer’s temperature uniformity with physically reasonable lamp powers. The proposed control technique was designed for commercial RTP equipment which has 10 tungsten-halogen lamp groups and 6 pyrometers installed for heating and measure a 12-inch wafer.

목차

Abstract
1. INTRODUCTION
2. PROCESS DESCRIPTION
3. DELTA-FORM STATE SPACE MODEL
4. CONSTRUCTION OF CONTROL METHOD
5. NUMERICAL RESULTS & DISCUSSION
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