Protection circuit for a power supply unit and respective power supply unit
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United States of America Patent
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-
May 20, 2003
Grant Date -
Jul 5, 2001
app pub date -
Dec 15, 2000
filing date -
Dec 30, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The protection circuit for a power supply unit comprises a switching stage, at which at least two output voltages to be monitored are connected, these voltages being isolated from one another by means of resistors. Arranged here in the connection path of the output voltages is a diode, which turns on and thereby triggers the switching stage in the event of a fault, when there is a drop in one of the output voltages. In this way, the switching stage provides information which acts on a control loop of the power supply unit, so that the power supply unit switches off. The protection circuit also includes a passive network with a resistor and a capacitor, which prescribes a time constant, after which the protection circuit permits renewed starting of the power supply unit. The switching stage may be realized, for example, by a transistor stage, which provides the information signal for the event of a fault for the power supply unit when turning on occurs. This circuit allows a plurality of output voltages of the power supply unit concerned to be monitored in a simple way with respect to a short-circuit, or an undervoltage.
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