US 5,796,596 A · Fault control circuit for switched power supply

Abstract

A voltage source, a transformer and a switching controller are coupled for switched mode generation of a regulated output supply voltage. A switching circuit responsive to an on/off signal turns the power supply on and off by establishing a conductive condition in a conductive path. A fault detector establishes a non-conductive condition in a part of the conduction path responsive to an overload condition. A delay circuit establishes a conductive condition in an auxiliary conduction path for a period of time after the power supply is turned on. The auxiliary conduction path becomes non-conductive when the fault detector establishes a conductive condition in the part of the conduction path. The part of the conduction path remains conductive absent an overload condition. A latch arrangement including the delay circuit maintains the non-conductive condition in the auxiliary conduction path until the power supply is turned off.

Claims16

Dependent claims

A switched power supply, comprising:

a voltage source, a transformer and a switching controller coupled for switched mode generation of an output supply voltage;
a feedback circuit for regulating said switched mode operation responsive to loading on said output supply voltage;
a switching circuit responsive to an on/off signal for turning said power supply on and off by controlling conduction in a conduction path, said power supply being turned on by a conductive condition in said conduction path;
a fault detector for controlling conduction in a part of said conduction path and establishing a non-conductive condition in said part of said conduction path responsive to an overload condition of said output supply voltage;
and,
a delay circuit for controlling an auxiliary conduction path bypassing said part of said conduction path controlled by said fault detector and establishing a conductive condition in said auxiliary conduction path for a period of time after said power supply is turned on.

3 more elements

A switched power supply, comprising:

a voltage source, a transformer and a switching controller coupled for switched mode generation of an output supply voltage;
a feedback circuit for regulating said switched mode operation responsive to loading on said output supply voltage;
a switching circuit responsive to an on/off signal for turning said power supply on and off by controlling conduction in a conduction path, said power supply being turned on by a conductive condition in said conductive path;
a fault detector for controlling conduction in a part of said conduction path and establishing a non-conductive condition in said part of said conduction path responsive to an overload condition of said output supply voltage;
and,
a latch arrangement having an auxiliary conduction path in parallel with said conduction path controlled by said fault detector and establishing a conductive condition in said auxiliary conduction path for a period of time after said power supply is turned on, said auxiliary conduction path becoming non-conductive when a conductive condition is established in said part of said conduction path, said latch arrangement maintaining said non-conductive condition of said auxiliary conduction path until said power supply is turned off.

3 more elements

Dependencies are inferred from the claim text.

Fault control circuit for switched power supply

Life of this patent

Fault control circuit for switched power supply

Life of this patent

Abstract

Claims16