Feedback loss protection arrangement in a power supply

Details Feedback loss protection arrangement in a power supply Feedback loss protection arrangement in a power supply

1994-02-22

1995-02-21

Skudy, R.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

363 50, G05F 140, H02H 710

Patent

active

053919785

ABSTRACT:
In a switch mode power supply a voltage developed in an isolating transformer is rectified via a first diode and coupled via a feedback path to a control terminal of a regulator. The voltage is also rectified via a second diode and coupled to a supply terminal of the regulator. A pair of diodes are coupled in series between the supply and control terminals. During normal operation, the pair of diodes are non-conductive. When, under a fault condition, the first diode is disconnected, the pair of diodes provide a redundant or alternative feedback path in a manner to prevent excessive output level of the power supply.

REFERENCES:
patent: 4621313 (1986-11-01), Kiteley
patent: 4658342 (1987-04-01), Wharton
patent: 4731720 (1988-03-01), Takahashi

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