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US 5,673,183 AGranted
DC/DC converter for low output voltages
AssigneeMelcher AG
InventorsJohann Milavec, Nigel Springett
Life of this patent
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AssigneeMelcher AG
InventorsJohann Milavec, Nigel Springett
Estimating the term…
With direct current/direct current converters of modern construction, which can be operated at frequencies as high as 500 kHz, the number of secondary windings that are necessary decreases with simultaneously high currents, so the necessary voltage can be generated by a single winding, or even by less than one winding. A push-pull converter exhibits, for example, a transformer with a center limb (19) and two outer limbs, and that contains on the secondary side two coils (29, 30), each of which consists of a single, complete winding with one center tap (B, E) each. These coils are placed around the center limb (19) in such a way that the two center taps (B, E) come to be located opposite each other in two openings (18) between the outer limbs. In the same opening (18) as the center limb (E) of the one coil (30), the terminals (A, C) of the other coil (29) are also located, and in the other opening (18), in which the center tap (B) of the other coil (29) is located, the terminals (D, F) of the one coil (30) are also located.
In a direct current/direct current converter for low voltages, both in accordance with the forward-current converter principle, as well as with the fly-back converter principle and the push-pull converter principle, with a primary section that chops the primary voltage, a transformer (3) that is supplied by the chopped primary voltage (U.sub.1) and that has a primary coil (4) and at least one secondary coil (21, 22, 29, 30), a secondary section that is supplied by the transformer (3) and that has a storage choke (10) and a storage capacitor (11) that is charged to the secondary voltage (U.sub.0), whereby the transformer (3) exhibits a center limb (19) which carries the magnetic flux .PHI. generated by the primary coil, and exhibits at least two outer limbs (23, 24), to which the cited magnetic flux .PHI. is distributed in equal portions, and the outer limbs (23, 24) are separated by openings (18), the improvement comprising:
Dependencies are inferred from the claim text.