H - Electricity – 03 – M
Patent
H - Electricity
03
M
354/81
H03M 1/52 (2006.01) G01D 1/02 (2006.01) G06G 7/161 (2006.01) G06G 7/20 (2006.01) H03K 7/08 (2006.01)
Patent
CA 1227872
Apparatus for converting analog-format signals to pulse-format signals Abstract: Apparatus for converting an analog-format electri- cal signal or quantity (such as the magnitude of an electrical circuit element) into a corresponding pulse- format signal, preferably in the form of a train of periodic pulses the lengths of which are controllable as a percentage of the cyclic period. A pulsed duty cycle signal is developed in a negative feedback loop around an integrator having an analog-format input signal. The integrator output controls the d-c level of an up-and-down ramp signal which is fed to a compar- ator to produce pulses during the times the ramp volt- age is above (or below) the firing threshold of the comparator. These pulses control a switch between the integrator input and a reference voltage so as to pro- duce a negative feedback signal for the integrator. the negative feedback action controls the d-c level at the integrator output and thereby sets the pulse duty- cycle to a value such that the average signal level through the pulsed switch to the integrator input re- lates in prescribed fashion to the applied input sig- nal. The duty-cycle signal developed through such feedback action corresponds directly to the magnitude of the applied input signal.
437487
Richardson David A.
Robinson Robert J.
Foxboro Company (the)
Smart & Biggar
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