Patent ID: 9740218
Date: 2017-08-22
CPC Classifications: G05F,H02M

Claim:
1. A power supply controller, comprising: a switching regulator configured to operate a power supply switch at a duty cycle so as to generate an input current in response to an input voltage and to generate an output voltage and an output current in response to the input current; and a current limiter configured to limit the output current to a limit threshold, regardless of a level of the output voltage, by limiting a switch current through the power supply switch in response to an estimate of an average of the output current, the current limiter configured to estimate the average of the output current equal to a product of an average of the input current and a value representative of a ratio of the input voltage divided by the output voltage, the current limiter further configured to estimate the average of the output current without directly measuring the output current and without using a directly measured value of the output current.