Input voltage ripple compensation of interleaved boost converter using cycle times

An interleaved boost converter comprising:

• a first converter having a first gate and operating at a first phase to receive an input voltage and generate a first converter output power;
• a second converter having a second gate and operating at a second phase to receive an input voltage and generate a second converter output power;
• a phase detector to receive a first phase feedback signal of the first converter and a second phase feedback signal of the second converter, to measure the phase difference between the first phase feedback signal and the second phase feedback signal and to produce a phase detection output indicating the measurement;
• a phase controller coupled to the phase detector to receive the phase detection output and to generate a phase adjustment output in response to the phase detection output;
• a phase compensator to receive a first duty cycle measurement of the first converter and a second duty cycle measurement of the second converter, to compare the first duty cycle measurement to the second duty cycle measurement and to generate a phase compensation in response to the comparison;
• a phase combiner to combine the phase adjustment output and the phase compensation to produce a phase control output;
• a differential ON time generation circuit coupled to the phase combiner to generate a first ON time for the first converter and a second ON time for the second converter and to adjust the second ON time based on the phase control output;
• and
• a cycle controller coupled to the first and the second converters and to the differential ON time generation circuit to receive the first and the second ON time and to generate a first drive signal to control switching of the first converter and to generate a second drive signal to control switching of the second converter in response to the first and the second ON time.

A method comprising:

• receiving a first duty cycle measurement of a first converter of an interleaved boost converter;
• receiving a second duty cycle measurement of a second converter of the interleaved boost converter;
• comparing the first duty cycle measurement to the second duty cycle measurement;
• generating a phase compensation in response to the comparison;
• combining a phase adjustment output and the phase compensation to produce a phase control output;
• generating a first drive signal to control switching of the first converter;
• adjusting a time of a second drive signal using the phase control output;
• and
• generating the second drive signal to control switching of the second converter.