Method and apparatus for voltage regulation via pseudo-random PWM modulation
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United States of America Patent
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Apr 30, 2002
Grant Date -
N/A
app pub date -
Aug 30, 2000
filing date -
Aug 30, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for increasing the voltage resolution of a PWM controller wherein the controller controls pulse width as a function of a PWM register count having a maximum count X where 1 part in X affords insufficient resolution, the method including receiving a high resolution voltage request count from within the range 0 through count Y where the voltage corresponding to count Y is equal to the voltage corresponding to count X and where count Y is greater than count X, the method including dividing the request signal by a divisor (Y/X) to generate an output value and a remainder, identifying a pseudo-random number within the range of possible remainder values, comparing the pseudo-random number to the remainder, where the pseudo-random number is less than the remainder, incrementing the output value, providing the output value to the PWM register as the register count and repeating the aforementioned steps.
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