An analog implementation to improve load transient response of PFC pre-regulators

Martin K H Cheung; Martin H L Chow; Chi Kong Tse

doi:10.1109/INTLEC.2007.4448900

An analog implementation to improve load transient response of PFC pre-regulators

Martin K H Cheung, Martin H L Chow, Chi Kong Tse

The Hong Kong Polytechnic University

Research output: Chapter in book / Conference proceeding › Conference article published in proceeding or book › Academic research › peer-review

7 Citations (Scopus)

Abstract

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.

Original language	English
Title of host publication	International Telecommunication Energy Conference, INTELEC 2007
Pages	848-855
Number of pages	8
DOIs	https://doi.org/10.1109/INTLEC.2007.4448900
Publication status	Published - 1 Dec 2007
Event	International Telecommunication Energy Conference, INTELEC 2007 - Rome, Italy Duration: 30 Sept 2007 → 4 Oct 2007

Conference

Conference	International Telecommunication Energy Conference, INTELEC 2007
Country/Territory	Italy
City	Rome
Period	30/09/07 → 4/10/07

ASJC Scopus subject areas

Energy Engineering and Power Technology
Electrical and Electronic Engineering

More information

10.1109/INTLEC.2007.4448900

Cite this

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An analog implementation to improve load transient response of PFC pre-regulators. / Cheung, Martin K H; Chow, Martin H L; Tse, Chi Kong.
International Telecommunication Energy Conference, INTELEC 2007. 2007. p. 848-855 4448900.

Research output: Chapter in book / Conference proceeding › Conference article published in proceeding or book › Academic research › peer-review

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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.

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.

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An analog implementation to improve load transient response of PFC pre-regulators

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