TY - GEN
T1 - An Analog Implementation to Improve Load Transient Response of PFC Pre-regulators
AU - Cheung, Martin K. H.
AU - Chow, Martin H. L.
AU - Tse, Chi K.
PY - 2007/9
Y1 - 2007/9
N2 - This paper presents an analog implementation to improve the load transient response of PFC pre-regulators. By means of a notch filter inserted between the output-voltage sensing network of the pre-regulator and the voltage control loop of the pre-regulator control circuitry, the bandwidth of the voltage control loop is greatly expanded without introducing extra input current harmonics into the pre-regulators. This approach uses operational amplifiers with R-C networks to realize the notch filter, therefore it can be implemented into the existing pre-regulators with minor modification. The notch filter can be applied in both continuous-conduction-mode (CCM) pre-regulators and discontinuous-conduction- mode (DCM) preregulators. Furthermore the size of the output capacitor of the pre-regulators can be reduced due to the expanded bandwidth of the voltage control loop. The improved load transient response of the analog notch filter is observed experimentally. A laboratory prototype of a 100W DCM flyback pre-regulator has been built to illustrate the benefits of this cost-effective solution. © 2007 IEEE.
AB - This paper presents an analog implementation to improve the load transient response of PFC pre-regulators. By means of a notch filter inserted between the output-voltage sensing network of the pre-regulator and the voltage control loop of the pre-regulator control circuitry, the bandwidth of the voltage control loop is greatly expanded without introducing extra input current harmonics into the pre-regulators. This approach uses operational amplifiers with R-C networks to realize the notch filter, therefore it can be implemented into the existing pre-regulators with minor modification. The notch filter can be applied in both continuous-conduction-mode (CCM) pre-regulators and discontinuous-conduction- mode (DCM) preregulators. Furthermore the size of the output capacitor of the pre-regulators can be reduced due to the expanded bandwidth of the voltage control loop. The improved load transient response of the analog notch filter is observed experimentally. A laboratory prototype of a 100W DCM flyback pre-regulator has been built to illustrate the benefits of this cost-effective solution. © 2007 IEEE.
UR - https://www.scopus.com/pages/publications/47849104484
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-47849104484&origin=recordpage
U2 - 10.1109/INTLEC.2007.4448900
DO - 10.1109/INTLEC.2007.4448900
M3 - RGC 32 - Refereed conference paper (with host publication)
SN - 9781424416288
SN - 9781424416271
T3 - INTELEC, International Telecommunications Energy Conference (Proceedings)
SP - 848
EP - 855
BT - INTELEC 07 - 29th International Telecommunications Energy Conference
T2 - 29th International Telecommunications Energy Conference (INTELEC 2007)
Y2 - 30 September 2007 through 4 October 2007
ER -