Adaptive Loop Modulation Technique for Enhanced Transient Response in Power Factor Correction Controller

• Main Authors: Chen,Yi-Ting, 陳怡婷
• Other Authors: Chen, Ke-Horng
• Format: Others
• Language: en_US
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/86178958272013459143

碩士 === 國立交通大學 === 電控工程研究所 === 100 === Due to the shortage of energy, high reliability and efficiency has become the focus of current green power systems. Power factor correction (PFC) can shape the input current of off-line power supplies in phase with the input AC voltage in order to increase the real power available from the AC source. Reliability of the Power Factor Correction (PFC) system is improved by fast transient response using the proposed adaptive loop modulation (ALM). Low bandwidth of less than 20 Hz that rejects AC source of 60/120 Hz coupling deteriorated system reliability in case of output load variation. The proposed ALM can automatically adjust bandwidth to rapidly increase or decrease inductor current in order to shorten transient response time. In steady state, system stability can be guaranteed by low-frequency compensation pole without being affected by ALM. The test circuit fabricated in TSMC 500V UHV LDMOS process demonstrated the performance of the highly-integrated PFC controller with the proposed ALM. Experimental results showed that the PFC system with ALM has high PF of 99%, high efficiency of 95%, and high power driving capability of about 90W. The improvement in transient response is faster than conventional PFC design with output load variation from 90 to 20W and vice versa