Controller and control method for converter including multiple pfc circuits

A converter control method, comprising:

• calculating, by a first core, Pulse Width Modulation (PWM) control values for first switches included in a first Power Factor Correction (PFC) circuit;
• calculating, by a second core, PWM control values for second switches included in a second PFC circuit;
• storing, by the first core, the PWM control values of the first switches in a first new-data variable;
• storing, by the second core, the PWM control values of the second switches in a second new-data variable, wherein a value of a first state variable is changed before and after storing the PWM control values of the second switches in the second new-data variable, and a value of the second new-data variable is stored in a second pre-data variable after storing the PWM control values of the second switches in the second new-data variable;
• setting, by the first core, registers for outputting PWM signals for the first switches based on the PWM control values of the first switches;
• and
• selecting, by the first core based on the value of the first state variable, one of values of the second new-data variable and the second pre-data variable to set registers for outputting PWM signals for the second switches.