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

A controller to regulate an output voltage of a power converter, comprising:

• a feedback reference circuit configured to receive a feedback signal representative of an output voltage of the power converter, the feedback reference circuit further configured to generate a drive signal to control a power switch of the power converter in response to the feedback signal;
• and
• an output power control circuit coupled to the feedback reference circuit, wherein
• the output power control circuit is configured to generate an adjust signal in response to a current sense signal representative of an output current of the power converter and a power signal representative of a desired value of an output power of the power converter,
• the adjust signal adjusts the feedback signal such that the controller regulates the output voltage to achieve the desired value of the output power, and
• the output power control circuit further comprises:
• an analog-to-digital converter (ADC) configured to receive the current sense signal and provide a measure signal which is a digital representation of the output current;
• a calculator circuit configured to receive a filtered version of the measure signal and determine a calculated value of the output voltage in response to the filtered version of the measure signal and the desired value of the output power;
• and
• an update circuit coupled to the calculator circuit and configured to receive the calculated value, the update circuit further configured to output an update signal to update the adjust signal, wherein a current value of the update signal is substantially equal to the calculated value if a previous value of the update signal is less than the calculated value.