Analog-to-digital converter circuit

Details Analog-to-digital converter circuit Analog-to-digital converter circuit

1992-10-23

1994-10-11

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

H03M 112

Patent

active

053551362

ABSTRACT:
An analog-to-digital converter circuit is adapted to control the speed of an electric motor. The circuit in one form comprises a low-pass filter receiving an analog speed instruction voltage, a comparator, a microprocessor incorporating a timer, and an inverter that controls the speed of the motor. The comparator compares the output signal from the filter with a triangular wave having a given frequency and a given amplitude. The output signal from the comparator is applied to the microprocessor, which produces a digital signal corresponding to the speed instruction voltage, by making use of internal clock pulses. The speed of the motor is detected by an encoder. The microprocessor controls the inverter in such a way that the difference between the speed detected by the encoder and the speed indicated by the digital signal becomes null.

REFERENCES:
patent: 3500109 (1967-09-01), Sugiyama et al.

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