Pulse Width Modulation Controller Architectures

A system comprising:

• a circuit comprising an inductor and a transistor that controls current through the inductor based on a pulse width modulation (PWM) signal, the circuit being configured to produce an output signal with an output voltage;
• and
• a controller configured to provide the PWM signal, the PWM signal comprising PWM cycles that each comprise an on-duration and an off-duration, wherein the controller is configured to:
• receive a first signal indicating an input voltage that is applied to the inductor,
• receive a second signal indicating a current through the inductor, use an on-duration parameter value to control each on-duration,
• cause a start of each on-duration based on a current trigger event indicated by the second signal,
• determine a maximum off-duration of the off-durations corresponding to the PWM cycles occurring within a first voltage cycle, the first voltage cycle being defined between two consecutive zero-crossing events as indicated by the first signal, and
• adjust the on-duration parameter value for a second, subsequent voltage cycle based on the maximum off-duration to regulate the output voltage.

A system comprising:

• a circuit comprising an inductor and a transistor that controls current through the inductor based on a pulse width modulation (PWM) signal, the circuit being configured to produce an output signal with an output voltage;
• a processor configured to provide an on-duration parameter value;
• and
• a controller, communicatively coupled with the processor, configured to provide the PWM signal, the PWM signal comprising PWM cycles that each comprise an on-duration and an off-duration, wherein the controller is configured to receive a first signal indicating an input voltage that is applied to the inductor, receive a second signal indicating a current through the inductor, use the on-duration parameter value to control each on-duration, cause a start of each on-duration based on a current trigger event indicated by the second signal, determine a maximum off-duration of the off-durations corresponding to the PWM cycles occurring within a first voltage cycle, the first voltage cycle being defined between two consecutive zero-crossing events as indicated by the first signal, and
• wherein the processor is configured to adjust the on-duration parameter value for a second, subsequent voltage cycle based on the maximum off-duration to regulate the output voltage.

A method comprising:

• receiving a first signal indicating a zero detection of an input voltage that is applied to an inductor of a circuit, the circuit being configured to produce an output signal with an output voltage;
• receiving a second signal indicating a zero detection of a current through the inductor;
• providing a pulse width modulation (PWM) signal that controls a current through the inductor based on an on-duration parameter value, the PWM signal comprising PWM cycles that each comprise an on-duration and an off-duration, wherein the on-duration parameter value controls the on-duration, and wherein a start of each on-duration is triggered by a current trigger event indicated by the second signal;
• determining a maximum off-duration of the off-durations corresponding to the PWM cycles occurring within a first voltage cycle, the first voltage cycle being defined between two consecutive zero-crossing events as indicated by the first signal;
• and
• adjusting the on-duration parameter value for a second, subsequent voltage cycle based on the maximum off-duration to regulate the output voltage.