Holdover circuit for AC-to-DC converters

Details Holdover circuit for AC-to-DC converters Holdover circuit for AC-to-DC converters

1992-03-25

1993-11-02

Beha, Jr., William H.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

307 64, 363 37, 363 89, H02J 900

Patent

active

052589013

ABSTRACT:
Holdover circuitry for an off line switcher, including a DC-to-DC converter, maximizes holdover time, during source voltage failures, by commutating a precharged holdover capacitor to the input of a power factor correcting preregulator. This limits the size of the holdover capacitor required without any loss in holdover time. Reduction in the size of the required holdover capacitor required for a desired holdover time improves volumetric efficiency of the off line switcher. This arrangement further improves efficiency of the DC-to-DC converter and decreases stress on its components by narrowing the input voltage range requirement.

REFERENCES:
patent: 4533986 (1985-08-01), Jones
patent: 4683529 (1987-07-01), Bucher
patent: 4795914 (1989-01-01), Higa et al.
patent: 4827151 (1989-05-01), Okado
patent: 4940929 (1990-07-01), Williams
patent: 5115185 (1992-05-01), Fraidlin et al.
patent: 5170070 (1992-12-01), Hattori et al.
"A resonance Power Supply that Provides Dynamic Power Factor Correction in Capacitor Input Off-Line Converters" by Amarasinghe & Manning, APEC '90 Conf Proc, Mar. 1990, pp. 563-570.
"Optimal Topologies of Resonant DC/DC Converters" by Kazimierczuk & Zwik, IEEE Transactions on Aerospace and Electronic Systems, May 1989, p. 364.
B. A. Miwa, D. M. Otten and M. F. Schlecht, "High Efficiency Power Factor Correction Using Interleaving Techniques", IEEE, (1992), pp. 557-568.

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