Ceramic machinery equipment AC current acquisition circuit

Abstract

The invention relates to a ceramic machinery equipment AC current acquisition circuit comprising a current acquisition network, an operation amplification circuit, a reference voltage circuit and a single-chip; an output end of the current acquisition network is connected with a non inverting input end of the operation amplification circuit; an output end of the reference voltage circuit is connected with the non inverting input end of the operation amplification circuit; an output end of the operation amplification circuit is connected with an ADC input end of the single-chip; the operation amplification circuit uses a differential amplifier circuit, uses level shift to improve input signal voltage, thus solving the problems that an operation amplifier cannot fully realize 0V output in single-power supply work, and realizing AC current bidirectional acquisition; the AC current acquisition circuit is wide in measuring range and high in precision; the AC current acquisition circuit uses single power supply so as to reduce power supply power source, and acquisition circuit complexity is not added; the circuit is concise in structure, easy to be implemented, thus saving cost.

Description

technical field [0001] The invention belongs to the technical field of electronic technology and signal detection, and in particular relates to an AC current acquisition circuit used in ceramic mechanical equipment. Background technique [0002] At present, in the occasions where general ceramic mechanical equipment detects AC current, in the amplifying circuit that can realize bipolar voltage output, the power supply mode is both positive and negative dual power supplies. If a single power supply is used, the output of the amplifier must be positive voltage, and cannot output negative voltage. At the same time, in the case of a single power supply, the output of the amplifier is saturated when the input of the amplifier is below a few mV, that is, the amplifier cannot output 0V completely during single power supply operation, which causes great trouble for detecting the negative current part of the AC current. The AD sampling processing of the single-chip microcomputer bri...

AI Technical Summary

Problems solved by technology

At the same time, in the case of a single power supply, the output of the amplifier is saturated when the input of the amplifier is below a few mV, that is, the amplifier cannot output 0V completely during single power supply operation, which causes great trouble for detecting the negative current part of the AC current. The AD sampling processing of the single-chip microcomputer brings a large error

In addition, the use of dual power supplies has one more negative power supply than single power supply, which increases the cost and the resources are not fully utilized.

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