Duty cycle control apparatus
AssigneeNorlin Industries, Inc.
InventorsGeorge R. Hall, Robert J. Hall
Life of this patent
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Abstract
Apparatus for controlling the duty cycle of a rectangular input signal so that the duty cycle normally remains constant irrespective of the frequency of the input signal, but can be adjusted with accuracy. A generator initiates a rectangular output signal in synchronism with the input signal. A comparator enables the generator to terminate the output signal after a time period related to the relative amplitudes of the output signal and another reference voltage. An adjustment transistor can adjust the amplitude of the reference voltage in order to control the overall duty cycle of the output signal.
Claims11
Apparatus for controlling the duty cycle of an input signal having a period, said apparatus comprising:
- control means for controlling the amplitude of the input signal;
- means responsive to the controlled input signal for generating a first reference signal having a first amplitude dependent on the period of the controlled input signal;
- generator means for initiating in synchronism with the input signal an output signal having a pre-determined second amplitude;
- and
- comparator means for enabling the generator means to terminate the output signal after a time period related to the relative amplitudes of the reference signal and the output signal, whereby the duty cycle of the output signal with respect to the input signal remains constant even though the frequency of the input signal changes.
Dependencies are inferred from the claim text.