Patent ID: 8692593

Claim:
A power-on and brown-out detector for a power supply comprising: a power-on detection module connected to the power supply and configured to generate a power-on signal in response to a voltage increase of the power supply; a brown-out detection module connected to the power supply and configured to generate a brown-out signal in response to a voltage charge by the power supply and a subsequent voltage decrease of the power supply; a logic module configured to generate a control signal in response to the power-on signal and the brown-out signal, wherein the power-on detection module is further configured to be activated or deactivated by the control signal; and wherein the power-on detection module includes: a switch connected to the power supply, a voltage divider connected to the switch and configured to generate a divided output voltage, and a trigger circuit configured to generate the power-on signal in response to the divided output voltage, wherein the brown-out detection module includes: a charger circuit connected to the power supply and configured to be charged to a charged voltage by the power supply, an inverter circuit connected to the charger circuit and configured to generate an inverted output voltage in response to the charged voltage, and a voltage comparator configured to generate the brown-out signal in response to the inverted output voltage, and wherein the switch is configured to be turned on or off by the control signal.