Method and apparatus to limit output power in a switching power supply
AssigneePower Integrations, Inc.
InventorsAlex Djenguerian, Stefan Baurle, Kent Wong
Life of this patent
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Abstract
Techniques are disclosed to adjust a current limit in a switching regulator. One example switching regulator includes a switch to be coupled to an energy transfer element of a power supply. A controller to generate a drive signal is coupled to control switching of the switch to regulate an output of the power supply. A current limiter is included in the controller to adjust the drive signal to limit a current though the switch to a variable current limit value. The variable current limit value is set by the current limiter in response to an input line voltage to be coupled to the energy transfer element.
Claims11
A power supply regulator, comprising:
- a comparator having first and second inputs and an output, the first input of the comparator adapted to sense a current flow through a switch, the second input of the comparator adapted to sense a variable current limit value;
- and
- a controller coupled to the output of the comparator and to the switch to control switching of the switch to regulate an output of a power supply in response a feedback signal, wherein the controller disables the switch if the sensed current flow through the switch is greater than the sensed variable current limit value, wherein the variable current limit value is set by the controller in response to an input line voltage of the power supply.
Dependencies are inferred from the claim text.