专利名称：HIGH RESOLUTION PULSE WIDTH
MODULATION (PWM) FREQUENCYCONTROL USING A TUNABLE OSCILLATOR
发明人：Stephen Bowling,James Bartling,Igor
Wojewoda
申请号：US12748881申请日：20100329
公开号：US20100259179A1公开日：20101014
专利附图：
摘要：A fluorescent lamp light intensity dimming control generates a pulse width
modulation (PWM) signal at about a fifty percent duty cycle and has very fine frequencychange granularity to allow precise and smooth light dimming capabilities. IntermediatePWM signal frequencies between the frequencies that are normally generated fromvalues in a period register of the PWM generator are provided with a variable frequencyclock source to the PWM generator. Selection of each frequency from the plurality offrequencies available from the variable frequency clock source may be determined froma value stored in a variable frequency clock register. A microcontroller may be used toselect appropriate frequencies for dimming control of the fluorescent lamp from thevariable frequency clock source, and the period and duty cycle values used in generatingthe PWM signal at about a fifty percent duty cycle.
申请人：Stephen Bowling,James Bartling,Igor Wojewoda
地址：Chandler AZ US,Chandler AZ US,Tempe AZ US
国籍：US,US,US
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