Patent ID: 8564263
Filing Date: 2013-10-22
Classification: G05F

Abstract:
1. A voltage regulator comprising: a constant voltage power circuit comprising a voltage output terminal for generating a constant output voltage and an output current, wherein the constant voltage power circuit further generates a divided voltage, which is proportional to the output voltage; and an overcurrent protection circuit comprising: a current sensing unit for generating a sensing current according to the output current; a first mirroring unit having a first current input terminal receiving the sensing current and a first mirroring current output terminal generating a first mirroring current according to the sensing current, wherein the first mirroring current is proportional to the output current; a voltage to current converting unit for generating a first current according to the divided voltage; a second mirroring unit having a second current input terminal receiving a second current and a second mirroring current output terminal generating a second mirroring current, wherein the second mirroring current is proportional to the second current and the first current is included in the second current; and a pull up unit connected to the first mirroring current output terminal and the second mirroring current output terminal for controlling the output voltage and the output current according to the first mirroring current and the second mirroring current.