Cycle modulation circuit capable of limiting peak voltage
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United States of America Patent
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Issued Date -
May 15, 2008
app pub date -
Nov 15, 2006
filing date -
Nov 15, 2006
priority date (Note) -
Abandoned
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Abstract
A cycle modulation circuit capable of limiting peak voltage to provide a pulse width control signal to a rear end power driving unit includes a comparison unit, an input voltage source and a linear voltage generation unit. The comparison unit compares an oscillation waveform signal generated by the linear voltage generation unit against a base value of a waveform signal level generated by the input voltage source to modulate and output the pulse width control signal of a combined cycle consisting of a high level and a low level. The pulse width control signal is input to the rear end power driving unit to limit the power driving unit in an equal restricted voltage peak value zone and determine the allowable duty cycle according to the level waveform signal.
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