Controlled Power Circuit With Adjusted Voltage Feedback to Regulate the Output Power

A controller for use in a power converter, comprising:

• a secondary controller coupled to receive a feedback signal representative of an output voltage of the power converter and a current sense signal representative of an output current of the power converter, wherein the secondary controller is coupled to generate a drive signal to control switching of the power converter to regulate the output voltage;
• wherein the secondary controller further comprises:
• a feedback reference circuit coupled to receive the feedback signal, wherein the feedback reference circuit generates the drive signal in response to the feedback signal;
• and
• an output power control circuit coupled to receive the current sense signal and a power signal representative of a desired value of output power of the power converter, wherein the output power control circuit generates an adjust signal to adjust the feedback signal such that the controller modifies the output voltage to regulate the output power to the desired value,
• wherein the output power control circuit further comprises:
• an analog-to-digital converter (ADC) coupled to receive the current sense signal and provide a measure signal which is a digital representation of the output current;
• and
• a controlled power circuit coupled to receive the measure signal and the power signal, wherein the controlled power circuit determines a calculated value of the output voltage which corresponds with the desired value of the output power and outputs an update signal which updates the adjust signal in response to the calculated value, wherein the update signal is substantially equal to the calculated value if a previous value of the update signal is less than or equal to the calculated value;
• and
• a primary controller coupled to receive the drive signal from the secondary controller via a communication link, wherein the primary controller is coupled to control the switching of a power switch of the power converter in response to the drive signal.