MOTOR CONTROL CIRCUIT FOR CONVEYOR WEIGHER

摘要

The converter circuit is illustrated as a feed-rate control circuit where a DC weight-per-unit length signal is multiplied by a pulse signal proportional to rate of flow of material. This product is further multiplied by a scaler signal to accommodate material delivery systems of various sizes. This product of three quantities is converted into a feedback frequency which is fed back to increase circuit response and linearity. The circuit is independent of any clock frequency and reference voltage variations by using the frequency and reference voltage in both the main input signal and the negative feedback signal. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.