ZERO-ELEMENT Russian patent published in 2020 - IPC G05B1/01 

FIELD: measuring equipment.

SUBSTANCE: invention relates to automatics and measurement equipment and is intended for detection of moment of voltage transition of input bipolar harmonic signal through zero level, in particular, can be used in devices of measurement of time intervals. Zero-element comprises high-pass filter (HPF), input signal standardizer, operational amplifier, unit of current limiters, normalizer of output signal, Schmitt trigger, first, second, third and fourth resistors. HPF input is the zero-body input. Output of HPF through the input signal normalizer is connected to the first outputs of the first and second resistors and to the inverting input of the operational amplifier. Output of the operational amplifier is connected to the second output of the second resistor, to the first output of the third resistor and to the input of the normalizer of the output signal. Output of the output signal normalizer is connected to the input of a Schmitt trigger, the output of which is a zero-output. Zero-body power inputs are inputs of the current limiter unit, the outputs of which are connected to supply inputs of the operational amplifier, the non-inverting input of which is connected to the second output of the third resistor and through the fourth resistor to the second output of the first resistor and to the common bus.

EFFECT: high reliability, accuracy of detecting zero level of the input signal and quality of the output signal, high noise-immunity, high degree of resistance to the EF, and possibility of interfacing with an external device.

1 cl, 2 dwg