Current estimating circuit for switch mode power supply

Details Current estimating circuit for switch mode power supply Current estimating circuit for switch mode power supply

1993-07-30

1995-10-10

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363 97, H02M 3335

Patent

active

054576202

ABSTRACT:
In a switch mode power supply the switch current of the power switch is connected to a low pass filter network during the time interval when current is flowing through the power switch. The filter network is disconnected from the power switch when switch current is not flowing. This technique takes advantage of the fact that the average current through the power switch during its conduction interval is either equal to the output current of the power supply, or is proportional with the ratio between the average switch current and the output current being the fixed isolation transformer turns ratio.

REFERENCES:
patent: 4885671 (1989-12-01), Peil
patent: 4947021 (1990-08-01), Stava
patent: 5066900 (1991-11-01), Bassett
patent: 5126931 (1992-06-01), Jitaru
patent: 5138543 (1992-08-01), Harm et al.
patent: 5285366 (1994-02-01), Zaretsky
patent: 5317499 (1994-05-01), Brakus

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