Browse Prior Art Database

DC Converter

IP.com Disclosure Number: IPCOM000083568D
Original Publication Date: 1975-Jun-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 22K

Publishing Venue

IBM

Related People

Krumrein, W: AUTHOR

Abstract

The circuit arrangement shown and its dimensions prevent primary side voltage fluctuations from affecting secondary side voltage fluctuations.

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DC Converter

The circuit arrangement shown and its dimensions prevent primary side voltage fluctuations from affecting secondary side voltage fluctuations.

Conventional DC converters are supplemented by an additional primary coil La, whose turns are counterclockwise to those of standard primary coil Ln, a diode D, and a capacitor C.

The function of the circuit refers to the transient state at; a) a normal input voltage, b) a higher input voltage, and c) a lower input voltage U.

The magnetic energy in the core is generated as a function of U + Uc. This sum must be constant for a), b), c). U + Uc = const = up U = Terminal voltage. Uc = Voltage on capacitor C. Up = Constant sum voltage.

In the case of a), the magnetic energy is linearly generated during a time t1 (switch S closed), when a voltage blocking diode D is induced into the additional primary coil La and an essentially constant voltage appears on capacitor C.

In the case of b), time tl is reduced by prematurely cutting off switch S. As a result of this, less energy is absorbed by the core at the same angle of pitch of the magnetic flux as a function of the time phi = f(t). Thus the value of Uc is less than in the case of a).

In the case of c), a time longer than t1 is available for generating the magnetic energy, so that at phi = f(t) the core absorbs less energy than in the case of a) and Uc is higher.

During the cutoff phase the magnetic field of the core is eliminated in a time t2 before switch S is agai...