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US 5,631,549 AGranted
Linear regulator power supply with an overcurrent protection device
AssigneeDaewoo Electronics Co., Ltd.
InventorJae-Gyoo Hong
Life of this patent
Estimating the term…
Abstract
An improved regulator apparatus comprises a regulation unit, in response to an operation signal, for regulating an input voltage to provide a regulated voltage to its dependent load and an overcurrent protection unit for blocking the operation of the regulation unit when a short-circuiting occurs in the load. The overcurrent protection unit includes a bypass transistor for bypassing the operation signal to the regulation unit and a diode for sensing the change in the potential level of the regulated voltage to activate the bypass transistor.
Claims3
A linear regulator power supply comprising:
- a plurality of regulation units, each of the regulation units having a switching transistor for providing a regulated voltage to a load connected to an output terminal thereof, means for producing a reference voltage and an operational amplifier for generating a switching signal to activate the switching transistor using a difference between the reference voltage and a comparison voltage;
- and
- means, connected between the load and the operational amplifier, for coupling the reference voltage to ground when there is a drop in the potential level of the regulated voltage due to a short circuiting occurred on the load, thereby making the operational amplifier inactive and the switching transistor inoperable.
Dependencies are inferred from the claim text.