Method and circuit for limiting the output current of a flyback

Details Method and circuit for limiting the output current of a flyback Method and circuit for limiting the output current of a flyback

1989-03-27

1990-03-13

Beha, Jr., William H.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 19, 363 21, H02M 3335

Patent

active

049087550

ABSTRACT:
A method and circuit for limiting the output current of a power supply with a self oscillating flyback converter, controls a primary peak current as a function of input and output voltages of the flyback converter. A quotient is formed from two given input variables and multiplied by a first constant. A second constant is added thereto and then multiplied by a third constant. The two input variables are defined by the input and output voltage of the flyback converter. The output voltage of the flyback converter is divided by the input voltage of the flyback converter in the quotient formation. The output variable is provided as a manipulated variable for controlling the primary peak current. The three constants are dimensioned for simulating a formal dependency existing in the flyback converter between the input and output voltages and the primary peak current of the flyback converter.

REFERENCES:
patent: 4291367 (1981-09-01), Haas

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