Circuit applied to full-wave rectification circuit of ultrasonic wave liquidometer

Abstract

The invention relates to a circuit applied to the full-wave rectification circuit of an ultrasonic wave liquidometer. An input signal Vi is connected with a capacitor C1 and a capacitor C2; one end of the capacitor C1 is connected with the input end of a reverse electronic switch U2; two paths of output COM1 and COM2 of the reverse electronic switch U2 are both connected to the homodromous end of a dual-path operational amplifier U1B; the other end of the capacitor C2 is connected with a resistor R1; the other end of the resistor R1 is connected with a resistor R2 and one reverse-end pin 2 of a dual-path operational amplifier U1A; the other end of the resistor R2 is connected with the output end pin 1 of the path 1 of the dual-path operational amplifier U1A and a capacitor C3; the other end of the capacitor C3 is connected with the output end N2 of the reverse electronic switch U2; the homodromous end of the path 1 of the dual-path operational amplifier U1A is earthed; the pin 8 of the dual-path operational amplifier U1A is connected with the anode of the power supply; the pin 4 of the dual-path operational amplifier U1A is earthed; the reverse-end pin 6 of the path 2 of the dual-path operational amplifier U1B is connected with a resistor R3; and the other end of the resistor R3 is connected with the output end pin 7 of the path 2 of the dual-path operational amplifier U1B. According to the circuit, sampled signal distortion can be avoided, and the output signal is more accurate.

Description

technical field [0001] The invention relates to a full-wave rectification circuit for automatic control or instrumentation, in particular to a circuit applied to a full-wave rectification circuit for an ultrasonic liquid level gauge. Background technique [0002] At present, some instruments and meters do not use full-wave rectification circuits in the signal processing process, but directly perform detection and calculation, and the signal strength is insufficient, resulting in signal distortion. There are also some instruments that only use a few simple diodes for rectification, which greatly reduces the accuracy of the instrument output signal. The main disadvantages of this design are: [0003] 1 If the meter uses diodes for rectification, when the signal is less than 0.7V, full-wave rectification cannot be achieved, which will cause signal error and wave loss, which will greatly reduce the output accuracy of the meter. [0004] 2 If the full-wave rectification circuit...

AI Technical Summary

Problems solved by technology

[0003] 1 If the meter uses diodes for rectification, when the signal is less than 0.7V, full-wave rectification cannot be achieved, which will lead to signal error waves, wave loss, etc., thereby greatly reducing the output accuracy of the meter

[0004] 2 If the full-wave rectification circuit is not used in the instrument, it will lead to insufficient sampling signal strength, which will have a great impact on the sampling signal of the instrument and affect the sampling accuracy

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