Output feedback and under-voltage detection system
AssigneePower Integrations, Inc.
InventorsBalu Balakrishnan, Alex Dienguerian, Leif Lund
Life of this patent
Estimating the term…
Abstract
A switched mode controller for properly handling an under-voltage condition in a power line which includes a current mirror for receiving current from the power line; a reference current source coupled to the current mirror for supplying a reference current; and a power transistor coupled to the reference current source, the power transistor generating a pulse width modulated signal when current from the power line exceeds the reference current, the power transistor being disabled when current from the power line is less than the reference current.
Claims42
A circuit for detecting an under-voltage condition at a voltage input of a power supply, comprising:
- a current mirror for receiving current representing the voltage input to the power supply;
- and
- a reference current source coupled to the current mirror to generate an under-voltage signal when the reference current exceeds the current from the power supply voltage input, the power supply being disabled when the under-voltage signal is generated.
A method for handling an under-voltage condition at a voltage input of a power supply comprising:
- sensing an input current representing the voltage input of the power supply;
- generating a reference current;
- detecting the under-voltage condition when the reference current exceeds the input current;
- and
- disabling the power supply when the under-voltage condition is detected.
A regulator circuit connected in series with a transformer primary winding to an input voltage, the regulator circuit comprising:
- a resistor coupled to the input voltage, the resistor providing an input current representing the input voltage;
- a current mirror coupled to the resistor for mirroring the input current;
- and
- a reference current source coupled to the current mirror to generate an under-voltage signal when the reference current exceeds the input current, the power supply being disabled when the under-voltage signal is generated.
A power supply circuit having an input voltage comprising:
- an under-voltage detector to receive a signal representing the input voltage on an electrical terminal to detect an under-voltage condition, the power supply being disabled when the under-voltage condition is detected;
- and
- a circuit coupled to the electrical terminal for receiving a feedback signal to regulate the power supply output.
A power supply comprising:
- an auto-restart circuit for alternatingly disabling and enabling the power supply when the power supply is under a fault condition;
- and
- an input under-voltage detector to detect an input under-voltage condition when the power supply is disabled by the auto-restart circuit and during power-up.
A method for handling an under-voltage condition at an input voltage of power supply circuit comprising:
- receiving an input signal representing the input voltage on an electrical terminal, the electrical terminal carrying the input signal and a feedback signal to regulate the power supply output;
- providing feedback control for the power supply based on the feedback signal carried by the electrical terminal;
- detecting an under-voltage condition based on the input signal;
- and
- disabling the power supply when the under-voltage condition is detected.
A method for handling an under-voltage condition at an input voltage of power supply circuit comprising detecting an input under-voltage condition when the power supply is disabled in auto-restart and during power-up.
Dependencies are inferred from the claim text.