CN116203464A - Analog signal detection circuit with single power supply and broken line detection function - Google Patents

Analog signal detection circuit with single power supply and broken line detection function Download PDF

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Publication number
CN116203464A
CN116203464A CN202310112614.8A CN202310112614A CN116203464A CN 116203464 A CN116203464 A CN 116203464A CN 202310112614 A CN202310112614 A CN 202310112614A CN 116203464 A CN116203464 A CN 116203464A
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China
Prior art keywords
voltage
resistor
operational amplifier
input
detection circuit
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CN202310112614.8A
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Chinese (zh)
Inventor
卢玲胜
吕晓东
徐琳
鲁国玺
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Hangzhou Zhaoding Technology Industrial Co ltd
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Hangzhou Zhaoding Technology Industrial Co ltd
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Priority to CN202310112614.8A priority Critical patent/CN116203464A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/54—Testing for continuity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The invention discloses an analog signal detection circuit with a single power supply and a broken wire detection function, which relates to the technical field of analog signal detection circuits and comprises an input voltage signal conversion circuit and a broken wire detection circuit; the method is used for performing operation processing on an input signal and a reference voltage by setting the reference voltage and the threshold voltage, converting positive and negative input voltage signals into positive voltage signals which can be identified by a processor, comparing the processed voltage with the threshold voltage to generate a disconnection warning signal, supplying power only by using positive voltage, generating a reference positive voltage which is higher than a normal voltage input range, performing operation on the input voltage signals and the reference voltage, changing the negative voltage signals into positive voltage signals, and continuously maintaining the positive voltage signals as the positive voltage signals. If the signal wire falls off, the processed voltage signal can become a voltage signal exceeding the normal input range, and then judgment is carried out, so that the disconnection alarm can be carried out.

Description

Analog signal detection circuit with single power supply and broken line detection function
Technical Field
The invention relates to the technical field of analog signal detection circuits, in particular to an analog signal detection circuit with a single power supply and a disconnection detection function.
Background
In the industrial field, various action instructions are often executed by using voltage signals, wherein the voltage signals have positive voltage and negative voltage, and the possibility that a signal wire falls off exists, so that a circuit capable of measuring positive and negative voltages and detecting disconnection is very necessary.
The main defects are as follows: the traditional scheme can realize positive and negative voltage signal detection and is easy to realize, but mainly has the following defects:
1. positive and negative power supplies must be used for power supply, so that the power supply design is complex;
2. without the wire break detection function, once the wire is broken, the voltage is detected to be 0V, so that it is impossible to distinguish whether it is a real 0V command or is caused by the wire break.
Disclosure of Invention
The invention aims to solve the technical problem of providing an analog signal detection circuit with a single power supply and a disconnection detection function, aiming at the defects of the background technology, setting a reference voltage and a threshold voltage, carrying out operation processing on an input signal and the reference voltage, converting positive and negative input voltage signals into positive voltage signals which can be identified by a processor, and comparing the processed voltage with the threshold voltage to generate a disconnection alarm signal.
The invention adopts the following technical scheme for solving the technical problems:
an analog signal detection circuit with a single power supply and a broken wire detection function comprises an input voltage signal conversion circuit and a broken wire detection circuit;
the method is used for performing operation processing on an input signal and a reference voltage by setting the reference voltage and the threshold voltage, converting positive and negative input voltage signals into positive voltage signals which can be identified by a processor, and comparing the processed voltage with the threshold voltage to generate a disconnection alarm signal.
As a further preferable scheme of the analog signal detection circuit with the single power supply and the disconnection detection function, the input voltage signal conversion circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, an operational amplifier U1, +15V voltage terminal, a 0V voltage terminal, a voltage VIN input terminal, a voltage VOUT output terminal and a voltage V-REE terminal;
the voltage VIN input end is connected with one end of a resistor R1, the other end of the resistor R1 is respectively connected with one end of a resistor R4, one end of a capacitor C1 and a positive input pin of an operational amplifier U1, the other end of the resistor R4 is connected with a voltage V-REE end, the other end of the capacitor C1 is connected with a 0V voltage end, a negative input pin of the operational amplifier U1 is respectively connected with one end of a resistor R2 and an output pin of the operational amplifier U1, a positive power pin of the operational amplifier U1 is connected with a +15V voltage end, a negative power pin of the operational amplifier U1 is connected with a 0V voltage end, the other end of the resistor R2 is respectively connected with one end of a resistor R3 and a voltage VOUT output end, and the other end of the resistor R3 is connected with the 0V voltage end.
As a further preferable scheme of the analog signal detection circuit with the single power supply and the disconnection detection function, the disconnection detection circuit comprises a voltage VOUT output end, a threshold voltage V-TH end, an operational amplifier U2, +15V voltage end, a 0V voltage end, a resistor R5 and an ERR-LOST end;
the output end of the voltage VOUT is connected with the positive input pin of the operational amplifier U2, the threshold voltage V-TH end is connected with the negative input pin of the operational amplifier U1, the positive side power pin of the operational amplifier U2 is connected with the +15V voltage end, the negative side power pin of the operational amplifier U2 is connected with the 0V voltage end, the output pin of the operational amplifier U2 is respectively connected with one end of the resistor R5 and the ERR-LOST end, and the other end of the resistor R5 is connected with the voltage VCC end.
As a further preferable scheme of the single power supply analog signal detection circuit with the disconnection detection function, the chip model of the operational amplifier U1 chip is TLV2372.
As a further preferable scheme of the analog signal detection circuit with the wire breakage detection function, which is powered by a single power supply, the chip model of the operational amplifier U2 chip is LM393.
As a further preferable scheme of the analog signal detection circuit with the single power supply and the disconnection detection function, the normal input range of the voltage VIN input end is-10V to +10V.
As a further preferable scheme of the analog signal detection circuit with the single power supply and the disconnection detection function, the voltage value of the voltage V-REE terminal is 12V.
As a further preferable scheme of the analog signal detection circuit with the disconnection detection function, which is powered by a single power supply, the ratio of the resistor R2 to the resistor R3 is 2.5:1.
As a further preferable scheme of the analog signal detection circuit with the disconnection detection function for single power supply of the present invention, in the circuit, the voltage VOUT output terminal= (voltage V-reeterminal+voltage VIN input terminal)/7.
As a further preferable mode of the single power supply analog signal detection circuit with the disconnection detection function, the threshold voltage v_th is 3.3V.
Compared with the prior art, the technical scheme provided by the invention has the following technical effects:
1. the invention relates to an analog signal detection circuit with a single power supply and a broken line detection function, which comprises an input voltage signal conversion circuit and a broken line detection circuit, wherein the input voltage signal conversion circuit and the broken line detection circuit are used for carrying out operation processing on an input signal and a reference voltage by setting the reference voltage and the threshold voltage, converting positive and negative input voltage signals into positive voltage signals which can be identified by a processor, and comparing the processed voltage with the threshold voltage to generate a broken line alarm signal;
2. the invention only uses positive voltage to supply power, and generates a reference positive voltage higher than the normal voltage input range, uses the input voltage signal and the reference voltage to operate, changes the negative voltage signal into the positive voltage signal, keeps the positive voltage signal, and if the signal wire falls off, the processed voltage signal becomes the voltage signal beyond the normal input range, and then judges at the moment, and can carry out disconnection alarm;
3. the invention has the advantages of single power supply, simplified power network design for system development, capability of generating disconnection alarm signals and improvement of reliability and intelligent degree of industrial equipment.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a circuit diagram of an input voltage signal conversion circuit of the present invention;
fig. 2 is a circuit diagram of the disconnection detecting circuit of the present invention.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to the accompanying drawings:
the following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
An analog signal detection circuit with a single power supply and a broken wire detection function comprises an input voltage signal conversion circuit and a broken wire detection circuit;
the method is used for performing operation processing on an input signal and a reference voltage by setting the reference voltage and the threshold voltage, converting positive and negative input voltage signals into positive voltage signals which can be identified by a processor, and comparing the processed voltage with the threshold voltage to generate a disconnection alarm signal.
The power supply is powered by a positive voltage only, and a reference positive voltage higher than the normal voltage input range is generated, the input voltage signal and the reference voltage are used for operation, the negative voltage signal is changed into a positive voltage signal, and the positive voltage signal is kept as the positive voltage signal. If the signal wire falls off, the processed voltage signal can become a voltage signal exceeding the normal input range, and then judgment is carried out, so that the disconnection alarm can be carried out.
As shown in fig. 1, the input voltage signal conversion circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, an operational amplifier U1, +15v voltage terminal, a 0V voltage terminal, a voltage VIN input terminal, a voltage VOUT output terminal, and a voltage V-REE terminal;
the voltage VIN input end is connected with one end of a resistor R1, the other end of the resistor R1 is respectively connected with one end of a resistor R4, one end of a capacitor C1 and a positive input pin of an operational amplifier U1, the other end of the resistor R4 is connected with a voltage V-REE end, the other end of the capacitor C1 is connected with a 0V voltage end, a negative input pin of the operational amplifier U1 is respectively connected with one end of a resistor R2 and an output pin of the operational amplifier U1, a positive power pin of the operational amplifier U1 is connected with a +15V voltage end, a negative power pin of the operational amplifier U1 is connected with a 0V voltage end, the other end of the resistor R2 is respectively connected with one end of a resistor R3 and a voltage VOUT output end, and the other end of the resistor R3 is connected with the 0V voltage end.
Preferably, the chip model of the operational amplifier U1 chip is TLV2372.
The normal input range of the voltage VIN input end is-10V to +10V, and the ratio of the resistor R2 to the resistor R3 is 2.5:1. In the circuit, the voltage VOUT output= (voltage V-reeterminal+voltage VIN input)/7. Thus, when the VIN input signal is changed from-10V to 0V, the change range of the output end of the voltage VOUT is changed from 0.29V to 1.71V; when the input signal of the voltage VIN input end is changed from 0V to 10V, the change range of the voltage VOUT output end is changed from 1.71V to 3.14V; and when the input signal drops, the output end of the voltage VOUT directly outputs the maximum value of 3.43V.
As shown in fig. 2, the disconnection detecting circuit comprises a voltage VOUT output terminal, a threshold voltage V-TH terminal, an operational amplifier U2, +15v voltage terminal, a 0V voltage terminal, a resistor R5, and an ERR-LOST terminal;
the output end of the voltage VOUT is connected with the positive input pin of the operational amplifier U2, the threshold voltage V-TH end is connected with the negative input pin of the operational amplifier U1, the positive side power pin of the operational amplifier U2 is connected with the +15V voltage end, the negative side power pin of the operational amplifier U2 is connected with the 0V voltage end, the output pin of the operational amplifier U2 is respectively connected with one end of the resistor R5 and the ERR-LOST end, and the other end of the resistor R5 is connected with the voltage VCC end.
Preferably, the chip model of the operational amplifier U2 chip is LM393. The threshold voltage v_th is 3.3V.
In the disconnection detection circuit, the threshold voltage V_TH is designed to be 3.3V, when the voltage is in a normal input range, the output signals of the output end of the voltage VOUT are smaller than the threshold voltage V_TH, the signal ERR_LOST is output as a logic 0 normal signal, if the signal line drops, the output signals of the output end of the voltage VOUT become 3.43V, and the voltage is larger than the threshold voltage V_TH, the comparator is turned over, and a logic 1 alarm signal is output.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.

Claims (10)

1. An analog signal detection circuit with a single power supply and a broken line detection function is characterized in that: comprises an input voltage signal conversion circuit and a broken wire detection circuit;
the method is used for performing operation processing on an input signal and a reference voltage by setting the reference voltage and the threshold voltage, converting positive and negative input voltage signals into positive voltage signals which can be identified by a processor, and comparing the processed voltage with the threshold voltage to generate a disconnection alarm signal.
2. The analog signal detection circuit with a single power supply having a disconnection detection function according to claim 1, wherein: the input voltage signal conversion circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, an operational amplifier U1, +15V voltage end, a 0V voltage end, a voltage VIN input end, a voltage VOUT output end and a voltage V-REE end;
the voltage VIN input end is connected with one end of a resistor R1, the other end of the resistor R1 is respectively connected with one end of a resistor R4, one end of a capacitor C1 and a positive input pin of an operational amplifier U1, the other end of the resistor R4 is connected with a voltage V-REE end, the other end of the capacitor C1 is connected with a 0V voltage end, a negative input pin of the operational amplifier U1 is respectively connected with one end of a resistor R2 and an output pin of the operational amplifier U1, a positive power pin of the operational amplifier U1 is connected with a +15V voltage end, a negative power pin of the operational amplifier U1 is connected with a 0V voltage end, the other end of the resistor R2 is respectively connected with one end of a resistor R3 and a voltage VOUT output end, and the other end of the resistor R3 is connected with the 0V voltage end.
3. The analog signal detection circuit with a single power supply having a disconnection detection function according to claim 1, wherein: the broken line detection circuit comprises a voltage VOUT output end, a threshold voltage V-TH end, an operational amplifier U2, a +15V voltage end, a 0V voltage end, a resistor R5 and an ERR-LOST end;
the output end of the voltage VOUT is connected with the positive input pin of the operational amplifier U2, the threshold voltage V-TH end is connected with the negative input pin of the operational amplifier U1, the positive side power pin of the operational amplifier U2 is connected with the +15V voltage end, the negative side power pin of the operational amplifier U2 is connected with the 0V voltage end, the output pin of the operational amplifier U2 is respectively connected with one end of the resistor R5 and the ERR-LOST end, and the other end of the resistor R5 is connected with the voltage VCC end.
4. The analog signal detection circuit with a single power supply having a disconnection detection function according to claim 1, wherein: the chip model of the operational amplifier U1 chip is TLV2372.
5. The analog signal detection circuit with a single power supply having a disconnection detection function according to claim 1, wherein: the chip model of the operational amplifier U2 chip is LM393.
6. The analog signal detection circuit with a single power supply having a disconnection detection function according to claim 1, wherein: the normal input range of the voltage VIN input end is-10V to +10V.
7. The analog signal detection circuit with a single power supply having a disconnection detection function according to claim 1, wherein: the voltage value of the voltage V-REE terminal is 12V.
8. The analog signal detection circuit with a single power supply having a disconnection detection function according to claim 1, wherein: the ratio of the resistor R2 to the resistor R3 is 2.5:1.
9. The analog signal detection circuit with a single power supply having a disconnection detection function according to claim 1, wherein: in the circuit, the voltage VOUT output= (voltage V-reeterminal+voltage VIN input)/7.
10. The analog signal detection circuit with a single power supply having a disconnection detection function according to claim 1, wherein: the threshold voltage v_th is 3.3V.
CN202310112614.8A 2023-02-14 2023-02-14 Analog signal detection circuit with single power supply and broken line detection function Pending CN116203464A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310112614.8A CN116203464A (en) 2023-02-14 2023-02-14 Analog signal detection circuit with single power supply and broken line detection function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310112614.8A CN116203464A (en) 2023-02-14 2023-02-14 Analog signal detection circuit with single power supply and broken line detection function

Publications (1)

Publication Number Publication Date
CN116203464A true CN116203464A (en) 2023-06-02

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Application Number Title Priority Date Filing Date
CN202310112614.8A Pending CN116203464A (en) 2023-02-14 2023-02-14 Analog signal detection circuit with single power supply and broken line detection function

Country Status (1)

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