Digital pulse-frequency modulation controller for switch-mode power supplies with frequency targeting and ultrasonic modes
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United States of America Patent
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Sep 3, 2013
Grant Date -
Sep 6, 2012
app pub date -
Mar 2, 2011
filing date -
Mar 2, 2011
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Abstract
A digital pulse controller uses digital logic to send pulses to a high side and low side switches of a switch-mode power supply converter. The digital logic uses a pulse frequency mode which includes a frequency targeting mode and an ultrasonic mode. The frequency targeting mode dynamically adjusts the size of the pulses in order to achieve a switching frequency within a desired band. The ultrasonic mode is switched into when the frequency of the pulses are at or below a threshold and the time of the pulses reaches a minimum threshold.
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