Method of operating an AC-DC converter

Details Method of operating an AC-DC converter Method of operating an AC-DC converter

1999-11-03

2000-10-24

Riley, Shawn

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

323284, G05F 110

Patent

active

061372722

ABSTRACT:
An AC-to-DC-converter (100) for driving a dynamic load (160), such as a motor, has a rectifier bridge (110), a coil (120), and a switch (130) to boost an output capacitor (150) by a coil current I(t). The current (I(t)) has periodical minimum values. The converter (100) is controlled by a monitor (170) and a modulator (180). The monitor (170) monitors the converter output (signal 102) during a predetermined monitoring interval (t.sub.M1, t.sub.M2) which is inside a minimum-to-minimum interval of the current (I(t)) and classifies changes (voltage .DELTA.V.sub.OUT) and/or current .DELTA.I.sub.OUT) into a first case (A) where the change exceeds a predetermined threshold (.DELTA.V.sub.TH) and a second case (B) where the change does not exceed the threshold. In order to shape the current (I(t)), in the first case (A), the modulator (180) immediately alters the current (I(t)), and in the second case (B), the modulator (180) alters the current (I(t)) when the current has its next minimum. Optionally, immediate altering can be prevented.

REFERENCES:
patent: 4761725 (1988-08-01), Henze
patent: 5747977 (1998-05-01), Hwang
patent: 5764024 (1998-06-01), Wilson
patent: 5959852 (1999-09-01), Deloy et al.
"U. Tietze and Ch. Schenk: `Halbleiter-Schaltungstechnik`, 10th edition, Springer Verlag, Berlin, Heidelberg, New York, ISBN 3-540-56184-6, sections 18.5 to 18.7 on pp. 561-586" The 9th edition of this book was published in English in 1991 under the title "Electronic Circuits, Design and Applications" No month.

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