Switched-mode power supply with current and voltage limitation

Details Switched-mode power supply with current and voltage limitation Switched-mode power supply with current and voltage limitation

1998-12-09

2000-01-18

Berhane, Adolf Deneke

Electric power conversion systems

Current conversion

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

363 19, 363 97, H02M 3335

Patent

active

060162600

ABSTRACT:
A switched-mode power supply uses duty cycle control for the switching transistor. The primary current through the primary winding is sensed by means of a sensing resistor in series with the switching transistor. The voltage across the sensing resistor is differentiated, compared with a reference and integrated. The integrated signal lengthens the off period of the switching transistor, thereby limiting the peak value of the primary current at the beginning of the on period of the switching transistor. The peak value of the primary current at the end of the on period is limited by sensing the voltage across the sensing resistor. The combined limitations of the primary current ensure that the output current of the switched-mode power supply is limited in a well-defined manner.

REFERENCES:
patent: 4985818 (1991-01-01), Niederreiter
patent: 4996638 (1991-02-01), Orr
patent: 5101334 (1992-03-01), Plagge et al.
patent: 5408402 (1995-04-01), Nonnenmacher
patent: 5717578 (1998-02-01), Afzal
patent: 5757629 (1998-05-01), Yntema et al.

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