Digital Average Input Current Control in Power Converter
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Abstract
A digital average-input current-mode control loop for a DC/DC power converter. The power converter may be, for example, a buck converter, boost converter, or cascaded buck-boost converter. The purpose of the proposed control loop is to set the average converter input current to the requested current. Controlling the average input current can be relevant for various applications such as power factor correction (PFC), photovoltaic converters, and more. The method is based on predicting the inductor current based on measuring the input voltage, the output voltage, and the inductor current. A fast cycle-by-cycle control loop may be implemented. The conversion method is described for three different modes. For each mode a different control loop is used to control the average input current, and the control loop for each of the different modes is described. Finally, the algorithm for switching between the modes is disclosed.
1 Citation
40 Claims
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1-20. -20. (canceled)
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21. A method comprising:
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determining, based on at least one of a sampled inductor current, a sampled input voltage, or a sampled output voltage, a value; controlling a duty cycle based on the value 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. - View Dependent Claims (22, 23, 24, 25)
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26. A method comprising:
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determining, based on at least one of a sampled inductor current, a sampled input voltage, or a sampled output voltage, a value; controlling a duty cycle based on the value 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 buck mode in response to determining that the duty cycle has been below a threshold for more than a plurality of consecutive switching cycles. - View Dependent Claims (27, 28, 29, 30)
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31. A method comprising:
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based on a sampled inductor current for a cycle, determining an inductor current for a next cycle; based on the determined inductor current, controlling a duty cycle 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. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification