Digital Average Input Current Control in Power Converter

A method comprising:

• predicting an inductor current based on at least one of a sampled inductor current, a sampled input voltage, or a sampled output voltage;
• controlling a duty cycle based on the predicted inductor current to cause an input current of a converter to approach a particular input current;
• and
• switching the converter from a buck-boost mode to a boost mode in response to determining that the duty cycle has been above a threshold for more than a plurality of consecutive switching cycles.

A method comprising:

• predicting an inductor current based on at least one of a sampled inductor current, a sampled input voltage, or a sampled output voltage;
• controlling a duty cycle based on the predicted inductor current to cause an input current of a converter to approach a particular input current;
• and
• transferring the converter from a buck-boost mode to a buck mode in response to determining that the duty cycle has been below a threshold for more than a plurality of consecutive switching cycles.

A method comprising:

• predicting an inductor current for a cycle based on a sampled inductor current for a previous cycle;
• controlling a duty cycle based on the predicted inductor current to set an input current of a converter;
• and
• switching the converter from a buck-boost mode to an alternative mode based on the duty cycle.