Primary adjusted switched-mode power supply

Details Primary adjusted switched-mode power supply Primary adjusted switched-mode power supply

1998-01-07

1999-11-02

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363 97, H02M 3335

Patent

active

059782358

ABSTRACT:
In order to adjust the output voltage and output current of a galvanically isolated switched-mode power supply, on the primary side there is formed an auxiliary voltage (15) proportional to the secondary voltage, and said auxiliary voltage is studied by means of a window comparator, so that when the auxiliary voltage is within the reference window, there is applied fixed power adjustment, and when the auxiliary voltage falls outside the reference window (>max, <min), the quantity of electric power fed in by the isolation transformer of the primary side is restricted. Most advantageously the auxiliary voltage is formed by means of an auxiliary coil (12b) contained in the isolation transformer, and the reverse threshold voltages of two zener diodes represent the limit values of the reference window.

REFERENCES:
patent: 4172276 (1979-10-01), Kameya
patent: 4302803 (1981-11-01), Shelly
patent: 4488210 (1984-12-01), Shono
patent: 4704670 (1987-11-01), Gradl et al.
patent: 4739462 (1988-04-01), Farnsworth et al.
patent: 4975823 (1990-12-01), Rilly et al.
patent: 5465039 (1995-11-01), Narita et al.
patent: 5467009 (1995-11-01), McGlinchey
patent: 5521807 (1996-05-01), Chen et al.
patent: 5657211 (1997-08-01), Brockmann
patent: 5757625 (1998-05-01), Schoofs
"Switch Mode Power Supply, New Concept", T. Kieffer et al, IEEE 1991 Int'l Conference on Consumer Electronics, Jun. 5-7, 1991, Rosemont IL, pp. 58-59 .

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