Simple current limiting coupling for regulating the output curre

Details Simple current limiting coupling for regulating the output curre Simple current limiting coupling for regulating the output curre

1998-01-07

1999-09-07

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363 56, 323902, H02M 3335, H02H 7122

Patent

active

059496614

ABSTRACT:
An output current limiting coupling for a switched-mode power supply is arranged to produce a feedback signal on the basis of the output current of the switched-mode power supply and to transmit it from the secondary side of the switched-mode power supply to its primary side by means of an opto-isolator (3). The coupling may include the following parts implemented with passive components: a bias voltage coupling (25, 26, 27, 28; 30, 31, 32, 33; 42, 43, 44, 45, 46) for forming a certain first potential to the first electrode of the light-emitting diode (3a) contained in the opto-isolator, and an input coupling (24) for producing a second potential formed on the basis of the output current to the second electrode of the light-emitting diode contained in the opto-isolator. The coupling is suitable for switched-mode power supplies regardless of whether the lighting of the light-emitting diode of the opto-isolator indicates a low or high value of the output current.

REFERENCES:
patent: 4378585 (1983-03-01), Bete
patent: 4383212 (1983-05-01), Ballman
patent: 4410934 (1983-10-01), Fathauer et al.
patent: 4849869 (1989-07-01), Tanuma et al.
patent: 5235505 (1993-08-01), Hiruma
patent: 5515263 (1996-05-01), Otake et al.
"The Art of Electronics" Horowitz et al, 2nd ed. ISBN 0-521-37095-7, Cambridge University Press, New York, USA, 1989, pp. 355-368.

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