Output feedback and under-voltage detection
AssigneePower Integrations, Inc.
InventorsBalu Balakrishnan, Alex Djenguerian, Leif Lund
Life of this patent
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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.
Claims20
A circuit for detecting an under-voltage condition at a voltage input of a power supply, comprising:
- a current mirror coupled to receive a current representing the voltage input of the power supply;
- and
- a reference current source to generate a reference current coupled to be received by the current mirror to generate an under-voltage signal when the reference current exceeds the current representing the voltage input of the power supply, the power supply being disabled when the under-voltage signal is generated.
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 to generate a reference current coupled to be received by 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.
Dependencies are inferred from the claim text.