Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1990-12-28
1992-04-07
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 56, H02M 3335
Patent
active
051033860
ABSTRACT:
A direct-voltage flyback converter includes a primary winding of a transformer in series with the switching path of a controllable switch which is connected in turn to a control device (P). A first capacitor (C1) in series with a first diode (D1) is connected in parallel with the transformer primary winding (N1). A series circuit consisting of a first coil (L1), a second diode (D2) and the first capacitor (C 1) is connected in parallel with the switching path. In order to regulate the output voltage of the switched-mode direct-voltage flyback converter accurately and with low losses, and without the control device being activated from the secondary side, a sensing circuit (M) and a demagnetization circuit (A) are connected to the control device (P). A winding (N3) of the transformer (Tr) is connected in the sensing circuit (M) and a second coil (L2), coupled to the first coil (L1), is connected in the demagnetization circuit (a). The second coil provides demagnetization by transferring energy stored in the first coil into the demagnetization circuit.
REFERENCES:
patent: 4675796 (1987-06-01), Gautherin et al.
Beha Jr. William H.
Franzblau Bernard
U.S. Philips Corporation
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