Patent RU-2757852-C1 (RU)
Title: Converter of voltage of analogue sensor to frequency or duty cycle
Inventor: GUTNIKOV ANATOLIJ IVANOVICH
IPC: G01R17/10
Filed: 2020-09-22
Granted: 2021-10-21
Abstract: FIELD: computing technology. 
     SUBSTANCE: disclosed is a converter of the voltage of an analogue sensor to frequency or duty cycle, containing a power source, connected whereto is a first input of the sensor, the first output of the first resistor is connected with the first output of the second resistor and the inverting input of the first operational amplifier, the first output of the third resistor is connected with the inverting input of the second operational amplifier and through a capacitor with the output of the second operational amplifier, a fourth resistor, an output apparatus, a first resistive voltage divider, a non-inverting amplifier, wherein additionally introduced are an analogue switch with an inverting control input, a second resistive voltage divider, a fifth and sixth resistors, a non-inverting voltage comparator, a conditional switch, wherein the output apparatus is made in the form of a pulse amplitude former stabilising the pulse amplitude, and the analogue sensor has two inputs and one output connected with the second output of the first resistor, and the first input is connected through series-connected fourth and fifth resistors with a shared bus, connected whereto is the second input of the analogue sensor, the point of combination of the fourth and fifth resistors is connected with the first input of the non-inverting amplifier and the non-inverting input of the first operational amplifier, the output whereof is connected with the second output of the second resistor and the second output of the third resistor, the first output whereof is connected through the sixth resistor with the input of the analogue switch, the output whereof is connected with the shared bus, and the inverting control input is connected with the output of the non-inverting voltage comparator and the first output of the second resistive voltage divider, the output whereof is connected with the non-inverting input of the voltage comparator, and the second output is connected with the output of the second operational amplifier, the non-inverting input whereof is connected with the output of the first resistive voltage divider, the first output whereof is connected with the shared bus and the second output is connected with a movable contact of the conditional switch, the first immovable contact whereof is connected with the output of the first operational amplifier and the second immovable contact is connected with the second input of the non-inverting amplifier, the output whereof is connected with the power supply input of the non-inverting voltage comparator, the output whereof is connected with the input of the output apparatus, the output whereof is the output of the converter of the voltage of an analogue sensor to frequency or duty cycle, wherein the non-inverting voltage comparator is made on two series-connected NOT CMOS logic elements, the input of the first whereof is the input of the non-inverting voltage comparator, the output of the second whereof is the output of the non-inverting voltage comparator, the power supply outputs of the NOT CMOS logic elements are the input of the non-inverting voltage comparator. 
     EFFECT: ensured implementation of a converter of the voltage of an analogue sensor to frequency or duty cycle. 
     1 cl, 6 dwg