Patent ID: 9520795
Filing Date: 2016-12-13
CPC Classification: H02M,Y02B

Claim Text:
1. A power supply controller comprising: a control circuit configured to form at least one switching control signal to control first and second switches to form a primary current through a resonant circuit to regulate an output voltage to a load from an input voltage and form a load current for the load wherein the first switch is enabled to supply current from the input voltage; a first circuit configured to receive a first signal that is representative of a value of the primary current and to receive a second signal that is representative of a value of the input voltage and responsively form a control signal having a value that is proportional to a delivered output power; a feedback circuit configured to receive a signal that is representative of the output voltage and form a feedback signal that is representative of the output voltage; a first compensation circuit configured to form a third signal that is proportional to a value that the input voltage has during at least a portion of a time that the first switch is enabled and to use the third signal to decrease a value of the feedback signal proportional to the input voltage wherein the decrease is performed in response to enabling the first switch; the power supply controller configured to adjust one of the first signal proportionally to the control signal to form a compensated current sense signal or to adjust the feedback signal proportionally to the control signal to form a compensated feedback signal; and the control circuit configured to terminate an ON-time of the first switch responsively to one of the compensated current sense signal approximately equaling the feedback signal or the compensated feedback signal approximately equaling the first signal.