ANALOGUE SYNCHRONOUS AMPLIFIER Russian patent published in 2020 - IPC G01R19/10 

FIELD: measuring equipment.

SUBSTANCE: invention relates to electrical measuring equipment, namely to devices for measuring voltages, and can be used for comparison of two variable voltages and measurement of their difference in metrological installations, for example in inductive divider. Analogue synchronous amplifier includes a differential amplifier, the inverting input of which is connected to a source of reference voltage, and the non-inverting input is connected to a source of compared voltage. Output of differential amplifier through voltage amplifier is connected to first input of synchronous detector, output of which is connected to low-pass filter, to which analogue-to-digital converter connected to microcontroller is connected. Input of buffer operational amplifier is connected to source of reference voltage, and output – through common point is connected to negative output of first photoelectric solar module and to positive output of second photoelectric solar module. Positive output of the first photoelectric solar module is connected to the positive input of the supply of the differential amplifier, the negative power input of which is connected to the negative output of the second photoelectric solar module. Reference voltage generator is connected to the phase shifter, which is connected to the second input of the synchronous detector.

EFFECT: invention provides amplification of suppression of in-phase signal, which increases accuracy of measurement of difference of two voltages and improves operation reliability of analogue synchronous amplifier.

1 cl, 1 dwg