Phase locked stepper motor controlled light chopper

Details Phase locked stepper motor controlled light chopper Phase locked stepper motor controlled light chopper

H - Electricity

02

P

88/122, 318/20

H02P 8/00 (2006.01) A61B 3/10 (2006.01) A61B 3/103 (2006.01) G02B 26/04 (2006.01)

Patent

CA 1259837

-16- ABSTRACT A phase locked loop stepper motor controlled light chopper for providing a specific pattern reversal rate. The stepper motor controlled light chopper includes a phase comparator for comparing the phase of a reference signal to the phase of a comparison signal; a RC low pass filter for filtering the output of the phase comparator; a voltage controlled oscillator having a frequency varying in response to the output of the RC filter. The chopper also includes a binary counter for generating count signals responsive to the frequency of the voltage controlled oscillator; a divide by 10 circuit counting one of the outputs of the binary counter and providing the comparison signal. The light chopper also includes a memory circuit for storing an eight state four bit gray code for driving a four phase stepper motor as a chopper wheel in a specified pattern mounted on a drive shaft.

507472

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