Constant current flyback power supply having forward converter m

Details Constant current flyback power supply having forward converter m Constant current flyback power supply having forward converter m

1997-02-24

1998-05-19

Nguyen, Matthew V.

Electric power conversion systems

Current conversion

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

H02M 3335

Patent

active

057544158

ABSTRACT:
A constant current power supply contains a multimode transformer that supplies constant current power over a two or four wire link transporting telecommunication signals to a remote telecommunication unit. It also supplies a reduced magnitude, constant supply voltage for powering the circuitry of the constant current power supply itself. A primary transformer winding receives a pulse width-modulated voltage from a switched mode voltage generator, which is powered by a reduced magnitude, constant voltage derived from a first auxiliary, forward converter mode, secondary winding of the multimode transformer, through a first diode and a first inductor. The multimode transformer also includes a flyback mode secondary winding coupled to the two wire link and operative to deliver a prescribed constant current to the remote load circuit. A current detector circuit coupled in circuit with the two wire link monitors current supplied to the remote load from the flyback mode secondary winding, and controls the operation of the switched mode voltage generator, to maintain constant current flow to the remote load. Constant voltage power for the current detector is derived through a second diode and a second inductor from a second auxiliary, forward converter mode, secondary winding of the multimode transformer.

REFERENCES:
patent: 4745538 (1988-05-01), Cross et al.
patent: 5479087 (1995-12-01), Wright
patent: 5528482 (1996-06-01), Rozman
patent: 5534768 (1996-07-01), Chacannes et al.
patent: 5555494 (1996-09-01), Morris

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