High bandwidth feed-forward oscillator
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United States of America Patent
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Aug 16, 2005
Grant Date -
Nov 18, 2004
app pub date -
Feb 23, 2004
filing date -
May 13, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A high bandwidth, feed-forward oscillator generates a ramp or sawtooth voltage for controlling the operation of a pulse width modulator-based, switched DC power supply circuit. The oscillator is operative to effectively immediately adjust the slope of each rising and falling portion of the ramp/sawtooth signal, as necessary, in proportion to the magnitude of the input voltage, while maintaining the frequency of the ramp waveform effectively constant. A comparator network establishes a difference between peak and valley portions of the sawtooth in accordance with input voltage. In response to a change in input voltage a control circuit modifies the value of the difference between the peak and valley portions to define a new set of respective peak and valley portions VpeakNEW and VvalleyNEW, and immediately causes the sawtooth waveform to transition to the new set of respective peak and valley portions VpeakNEW and VvalleyNEW at said prescribed frequency.
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