Patent ID: 11921527
Assignee: COPELAND LP
Field: Control (Instruments)
Classification: CPC G  H | IPC G

Claim 11:
12. An optocoupler circuit comprising:
a first resistor;
a second resistor
an optocoupler comprising a light source and a phototransistor, wherein the light source is connected to form a first voltage divider with the first resistor, wherein the phototransistor is connected to form a second voltage divider with the second resistor, wherein the optocoupler transitions an output of the second voltage divider between a first level and a second level, and wherein magnitudes of the first level and the second level are greater than zero;
a comparator comprising a first input and a second input, wherein the first input receives an output of the first voltage divider; and
a feedback loop comprising a filter, wherein the feedback loop is connected to the second input and the output of the comparator, wherein the filter receives the output of the second voltage divider and provides a reference voltage to the second input of the comparator, and
wherein the comparator is connected to the output of the second voltage divider, receives the reference voltage and detects a change in the output of the second voltage divider, and based on the change, transitions an output of the comparator between a third level and a fourth level.