Abstract
In this paper a simple control method is presented for a single-stage single-switch isolated PFC regulator that can simultaneously achieve unity power factor and fast output voltage regulation, while keeping the voltage stress of the storage capacitor low. The converter topology comprises essentially a cascade combination of a discontinuous-mode boost converter and a continuous-mode forward converter. The proposed control utilizes variation of both duty cycle and frequency. The role of varying the duty cycle is mainly to regulate the output voltage. Changing the frequency, moreover, can achieve unity power factor as well as low voltage stress. Basically the switching frequency is controlled such that it has a time periodic component superposed on top of a static value. While the time periodic component removes the harmonic contents of the input current, the static value is adjusted according to the load condition so as to maintain a sufficiently low voltage stress across the storage capacitor. The theory is first presented which shows the possibility of meeting all three requirements using a combined duty-cycle and frequency control. An experimental prototype circuit is presented to verify the controller's functions.
Original language | English |
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Title of host publication | PESC Record - IEEE Annual Power Electronics Specialists Conference |
Pages | 1422-1428 |
Number of pages | 7 |
Volume | 2 |
DOIs | |
Publication status | Published - 1 Jan 1998 |
Event | Proceedings of the 1998 IEEE 29th Annual Power Electronics Specialists Conference, PESC. Part 2 (of 2) - Fukuoka, Japan Duration: 18 May 1998 → 21 May 1998 |
Conference
Conference | Proceedings of the 1998 IEEE 29th Annual Power Electronics Specialists Conference, PESC. Part 2 (of 2) |
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Country/Territory | Japan |
City | Fukuoka |
Period | 18/05/98 → 21/05/98 |
ASJC Scopus subject areas
- Electrical and Electronic Engineering