CN113691250A - Remote direct current switch signal matcher - Google Patents

Remote direct current switch signal matcher Download PDF

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Publication number
CN113691250A
CN113691250A CN202010418540.7A CN202010418540A CN113691250A CN 113691250 A CN113691250 A CN 113691250A CN 202010418540 A CN202010418540 A CN 202010418540A CN 113691250 A CN113691250 A CN 113691250A
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China
Prior art keywords
switch
resistor
signal
direct current
constant current
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CN202010418540.7A
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Chinese (zh)
Inventor
肖强晖
王鸿儒
张阳
廖无限
徐迈
邹瑶
曲思源
徐彬鑫
谌淼军
刘贺
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Hunan University of Technology
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Hunan University of Technology
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Priority to CN202010418540.7A priority Critical patent/CN113691250A/en
Publication of CN113691250A publication Critical patent/CN113691250A/en
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    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K17/00Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated

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  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The invention discloses a remote direct-current Switch signal matcher which is characterized by comprising an input end Switch _ in, an output end Switch _ out and a direct-current Switch signal matching module; the input end Switch _ in is provided with a pair of wiring terminals and is mainly used for connecting a mechanical Switch or an electrical appliance with an equivalent mechanical Switch; the output end Switch _ out is connected with an indicator or a controller for receiving input signals representing switching values in high and low level changes; the dc Switch signal matching module is configured to receive the signal of the input terminal Switch _ in, convert the signal into a corresponding high-low level signal after circuit conversion, and send the signal to the output terminal Switch _ out. The remote direct current switch signal matcher is not only suitable for short-range lines, but also particularly suitable for long-range lines; the method not only overcomes the defect that the prior art can not transmit high and low level change signals in a long distance, but also adds a technical means for preventing external electromagnetic interference in the long-distance transmission process.

Description

Remote direct current switch signal matcher
Technical Field
The invention relates to the field of electrical control, in particular to a remote direct-current switch signal matcher which is suitable for a remote conversion circuit for representing switching value input signals by high and low level changes.
Background
In the field of electrical control, electrical appliances of mechanical switches or equivalent mechanical switches are widely applied, and are connected in a circuit through a line, the on-off action of the electrical appliances can generate related switching value input signals to an indicator or a controller, the switching value input signals are characterized by high and low level changes, and the line is a channel and a medium for signal transmission, so that accurate and reliable signal transmission of the high and low level changes is of great importance.
The inventor discovers that in the process of implementing the embodiment of the invention:
if the circuit between the mechanical switch or the electrical appliance with the equivalent mechanical switch function and the indicator or the controller is short, the accurate and reliable target can be conveniently achieved by adopting the metal conducting wire to transmit high and low level signals; however, when the cable is used in a line with the length of dozens of meters to hundreds of meters, the signal transmission performance is disorderly, and the normal operation is difficult; the first is that the equivalent resistance of the long-distance line must be considered in the signal transmission process, the equivalent impedance of the line is in direct proportion to the length of the line, the contact impedance of the mechanical switch or the electrical contact of the equivalent mechanical switch is the contact impedance when the electrical contact is closed, if the equivalent impedance of the line is far greater than the contact impedance of the contact, according to the voltage division principle, the voltage drop on the electrical contact of the mechanical switch or the equivalent mechanical switch can be ignored, when the electrical contact is disconnected with the electrical contact, the voltage amplitude measured at the input end of the indicator or the controller is almost the same, namely the on-off state of the electrical contact is indistinguishable, and the line cannot accurately transmit high and low level changes; secondly, in the presence of external electromagnetic interference, the larger the line equivalent impedance is, the longer the line is, the more easily the line passively generates induced voltage, and the more easily the line receives external differential mode interference or common mode interference, that is, a disordered high-low level change signal is generated on the line, thereby causing signal indication disorder and the adverse effect of controller malfunction.
Therefore, a remote direct current switch signal matching device is currently absent in the field of electrical control.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a remote direct current switch signal matcher which is suitable for a remote conversion circuit for representing a switching value input signal by high and low level changes.
The technical scheme adopted by the invention is as follows:
a remote direct current Switch signal matcher comprises an input end Switch _ in, an output end Switch _ out and a direct current Switch signal matching module; the input end Switch _ in is provided with a pair of wiring terminals and is mainly used for connecting a mechanical Switch or an electrical appliance with an equivalent mechanical Switch; the output end Switch _ out is connected with an indicator or a controller for receiving input signals representing switching values in high and low level changes; the direct current Switch signal matching module is configured to receive the signal of the input terminal Switch _ in, change the signal into a corresponding high-low level signal after circuit conversion, and send the signal to the output terminal Switch _ out; the direct current Switch signal matching module comprises a direct current constant current source, a dummy load and an adjusting resistor, wherein the output end of the direct current constant current source is respectively connected with one end of the input end Switch _ in and one end of the dummy load, the other end of the dummy load is respectively connected with a direct current constant current source GND, one end of the adjusting resistor and one end of the output end Switch _ out, the other end of the input end Switch _ in is respectively connected with the other end of the adjusting resistor and the other end of the output end Switch _ out, and the adjusting resistor is used for adjusting the amplitude of high level output by the output end Switch _ out.
The loop formed by the direct current constant current source, the line, the electrical appliance of the mechanical switch or the equivalent mechanical switch and the adjusting resistor can not be influenced by the resistance of the line, except that the electrical appliance of the mechanical switch or the equivalent mechanical switch is disconnected without current, as long as the mechanical switch or the equivalent mechanical electrical appliance is closed, the loop must flow current, whether the current flows through the adjusting resistor is detected, namely, the on-off of the electrical appliance of the mechanical switch or the equivalent mechanical switch can be accurately reflected according to whether voltage drop is generated on the adjusting resistor, and finally, the signal transmission of high and low level change is realized; in addition, the other loop formed by the direct current constant current source and the dummy load is an open circuit protection provided for the direct current constant current source.
Further, the dummy load is a fixed resistor or an adjustable resistor, and may also be an electronic load with an equivalent fixed resistor or an equivalent adjustable resistor function.
Further, the adjusting resistor is a fixed resistor or an adjustable resistor, and can also be an electronic load with the function of an equivalent fixed resistor or an equivalent adjustable resistor.
Further, the direct current constant current source is composed of a voltage stabilizing integrated circuit.
Further, the direct current constant current source is a circuit composed of a power supply integrated chip LM317 and a constant current preset resistor R1; the dummy load is a resistor R2, and the adjusting resistor is an adjustable resistor RT;
the IN pin of the power integrated chip LM317 is connected to a constant current power supply VCC, the OUT pin is connected to one end of a constant current preset resistor R1, and the other end of the constant current preset resistor R1 is connected to the ADJ pin of the power integrated chip LM317, one end of a resistor R2, and one end of the input terminal Switch _ IN, respectively; the other end of the input end Switch _ in is respectively connected with one end of the output end Switch _ out and one end of the adjustable resistor RT; the other end of the adjustable resistor RT is connected to the other end of the resistor R2, the other end of the output terminal Switch _ out, and the constant current source GND, respectively.
The remote direct current switch signal matcher has the advantages that the technology that a direct current constant current source is not influenced by the magnitude of series impedance is adopted, so that the remote direct current switch signal matcher is not only suitable for short-range circuits, but also particularly suitable for long-range circuits; the method not only overcomes the defect that the prior art can not transmit high and low level change signals in a long distance, but also adds a technical means for preventing external electromagnetic interference in the long-distance transmission process.
Drawings
Fig. 1 is a schematic diagram of a prior art remote dc switch application.
Fig. 2 is a typical schematic diagram of a remote dc switch signal matcher according to the present invention.
Fig. 3 is an equivalent schematic diagram of the dummy load and the trimming resistor.
Fig. 4 is a diagram illustrating an embodiment of a remote dc switch signal matcher according to the present invention.
Fig. 5 is a diagram illustrating an embodiment of a remote dc switch signal matcher according to the present invention.
Fig. 6 is another embodiment of a remote dc switch signal matcher according to the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments thereof are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
As shown in fig. 1, which is a schematic diagram of a remote dc switch in the prior art, it can be seen that, in the process of signal transmission of a long-distance line, an equivalent resistance R of the line must be considered, the equivalent resistance R of the line is proportional to the length of the line, contact impedances are present when electrical contacts of a mechanical switch or an equivalent mechanical switch are closed, if the equivalent resistance R of the line is much greater than the contact impedance of the contacts, according to the voltage division principle, a voltage drop at the electrical contacts of the mechanical switch or the equivalent mechanical switch can be ignored, when the electrical contacts are opened, a voltage amplitude value measured at an input end of an indicator or a controller is almost the same, that is, an on-off state of the electrical switch is indistinguishable, and the line cannot accurately transmit high and low level changes; in addition, under the condition of external electromagnetic interference, the larger the line equivalent impedance R is, the longer the line is, the more easily the line passively generates induced voltage, and the longer the line is, the more easily the line is subjected to external differential mode interference or common mode interference, that is, disordered high and low level change signals can be generated on the line, and finally, the serious consequence of corresponding misoperation can be caused.
Fig. 2 is a schematic diagram of a remote dc Switch signal matcher according to an exemplary embodiment of the present invention, including an input Switch _ in, an output Switch _ out, and a dc Switch signal matching module; the input end Switch _ in is provided with a pair of wiring terminals and is mainly used for connecting a mechanical Switch or an electrical appliance with an equivalent mechanical Switch; the output end Switch _ out is connected with an indicator or a controller for receiving input signals representing switching values in high and low level changes; the direct current Switch signal matching module is configured to receive the signal of the input terminal Switch _ in, change the signal into a corresponding high-low level signal after circuit conversion, and send the signal to the output terminal Switch _ out; the direct current Switch signal matching module comprises a direct current constant current source, a dummy load and an adjusting resistor, wherein the output end of the direct current constant current source is respectively connected with one end of the input end Switch _ in and one end of the dummy load, the other end of the dummy load is respectively connected with a direct current constant current source GND, one end of the adjusting resistor and one end of the output end Switch _ out, the other end of the input end Switch _ in is respectively connected with the other end of the adjusting resistor and the other end of the output end Switch _ out, and the adjusting resistor is used for adjusting the amplitude of high level output by the output end Switch _ out.
The loop formed by the direct current constant current source, the line, the electrical appliance of the mechanical switch or the equivalent mechanical switch and the adjusting resistor can not be influenced by the resistance of the line, except that the electrical appliance of the mechanical switch or the equivalent mechanical switch is disconnected without current, as long as the mechanical switch or the equivalent mechanical electrical appliance is closed, the loop must flow current, whether the current flows through the adjusting resistor is detected, namely, the on-off of the electrical appliance of the mechanical switch or the equivalent mechanical switch can be accurately reflected according to whether voltage drop is generated on the adjusting resistor, and finally, the signal transmission of high and low level change is realized; in addition, the other loop formed by the direct current constant current source and the dummy load is an open circuit protection provided for the direct current constant current source.
Fig. 3 is an equivalent schematic diagram of the dummy load and the adjusting resistor, where the dummy load and the adjusting resistor are fixed resistors or adjustable resistors, and may also be electronic loads with functions of equivalent fixed resistors or equivalent adjustable resistors.
Fig. 4 shows an embodiment of a remote dc switch signal matcher according to the present invention. The direct current constant current source is composed of a voltage stabilizing integrated circuit, and is composed of a power supply integrated chip LM317 and a constant current preset resistor R1; the dummy load is a resistor R2, and the adjusting resistor is an adjustable resistor RT; the IN pin of the power integrated chip LM317 is connected to a constant current power supply VCC, the OUT pin is connected to one end of a constant current preset resistor R1, and the other end of the constant current preset resistor R1 is connected to the ADJ pin of the power integrated chip LM317, one end of a resistor R2, and one end of the input terminal Switch _ IN, respectively; the other end of the input end Switch _ in is respectively connected with one end of the output end Switch _ out and one end of the adjustable resistor RT; the other end of the adjustable resistor RT is connected to the other end of the resistor R2, the other end of the output terminal Switch _ out, and the constant current source GND, respectively.
Fig. 5 is a schematic diagram of an embodiment of a remote dc switch signal matcher according to the present invention, which is substantially the same as the embodiment of fig. 4, wherein the constant current preset resistor R1 has a resistance of 250 Ω, the resistor R2 has a resistance of 5K Ω, and the adjustable resistor RT has a resistance of 1K Ω; in addition, one end of the output end Switch _ out is externally connected with a branch circuit formed by serially connecting a current-limiting resistor R3 and a light-emitting diode LED1 to the other end of the output end Switch _ out, and the branch circuit is used for indicating the working state of the remote direct current Switch signal matcher;
specifically analyzing the working process of the above specific embodiment:
the reference voltage Vref inside the power integrated chip LM317 is 1.25V, the output current Iadj of the ADJ pin is in microampere level, and compared with the output current I0 of the OUT pin, the reference voltage Iadj can be ignored, the output current I0 of the OUT pin can be considered as the output current of the direct current constant current source, the quantitative relation of I0 is that I0= Vref/R1, and the output current I0 of the direct current constant current source can be determined as long as the resistance value of the constant current preset resistor R1 is determined; the output current I0 of the dc constant current source of this embodiment can be distinguished according to whether the external mechanical switch or the electrical appliance of the equivalent mechanical switch is turned on or off, and there are two current flowing situations: in the first current flowing condition, when the mechanical switch or an electrical appliance equivalent to the mechanical switch is closed, the output current I0 of the direct current constant current source has two current loops, namely a current loop I1 and a current loop I2, wherein the current loops are from the direct current constant current source, a resistor R2 to a constant current power source GND; the current loop I2 is formed by a direct current constant current source, a mechanical switch or an electrical appliance with an equivalent mechanical switch, an adjustable resistor RT to a constant current power supply GND, voltage drop can be generated on the adjustable resistor RT, and the appropriate high level voltage amplitude can be adjusted by adjusting the impedance of the adjustable resistor RT to represent the closed working state of the mechanical switch or the electrical appliance with the equivalent mechanical switch, and an external light emitting diode LED1 can be lightened; in the second current flow condition, when the mechanical switch or the electrical appliance of the equivalent mechanical switch is turned off, the output current I0 of the dc constant current source has only one current loop, i.e. the current loop is from the dc constant current source, the resistor R2 to the constant current source GND, and compared with the first current flow condition, the current loop is only the current loop I1, and the current loop is set for preventing the open circuit protection of the dc constant current source, at this time, because the current loop I2 does not form a current loop, the voltage drop on the adjustable resistor R is zero to represent the working state of the mechanical switch or the electrical appliance of the equivalent mechanical switch, and the external light emitting diode LED1 is extinguished.
Referring to fig. 6, a working process of another embodiment of the remote dc Switch signal matcher according to the present invention is substantially the same as that of the embodiment of fig. 5, except that one end of the output Switch _ out is externally connected to a transistor Q1 to drive a Switch circuit of a relay J1, an emitter of a transistor Q1 is connected to the other end of the output Switch _ out, wherein the transistor Q1 is S8050, the relay J1 is HF46-5-HS1, and the freewheeling diode D1 is 1N 4148; that is, when the external mechanical Switch or the electrical appliance of the equivalent mechanical Switch is in the off state, the output Switch _ out is at the low level, and the relay J1 performs the power-off action. When the external mechanical Switch or the electrical appliance of the equivalent mechanical Switch is in a closed state, the output terminal Switch _ out is at a high level, and the relay J1 performs an electric action.

Claims (5)

1. A long-range direct current Switch signal matcher, is suitable for representing the long-range switching circuit of the input signal of switching value with the change of the high-low level, characterized by, including input end Switch _ in, output end Switch _ out and direct current Switch signal match module;
the input end Switch _ in is provided with a pair of wiring terminals and is mainly used for connecting a mechanical Switch or an electrical appliance with an equivalent mechanical Switch;
the output end Switch _ out is connected with an indicator or a controller for receiving input signals representing switching values in high and low level changes; the direct current Switch signal matching module is configured to receive the signal of the input terminal Switch _ in, change the signal into a corresponding high-low level signal after circuit conversion, and send the signal to the output terminal Switch _ out; the direct current Switch signal matching module comprises a direct current constant current source, a dummy load and an adjusting resistor, wherein the output end of the direct current constant current source is respectively connected with one end of the input end Switch _ in and one end of the dummy load, the other end of the dummy load is respectively connected with a direct current constant current source GND, one end of the adjusting resistor and one end of the output end Switch _ out, the other end of the input end Switch _ in is respectively connected with the other end of the adjusting resistor and the other end of the output end Switch _ out, and the adjusting resistor is used for adjusting the amplitude of high level output by the output end Switch _ out.
2. The remote direct current switch signal matcher of claim 1, wherein the dummy load is a fixed resistor or an adjustable resistor, and is an electronic load with an equivalent fixed resistor or an equivalent adjustable resistor function.
3. The remote direct current switch signal matcher of claim 1, wherein the adjusting resistor is a fixed resistor or an adjustable resistor, and is an electronic load with an equivalent fixed resistor or an equivalent adjustable resistor function.
4. The remote dc switch signal matcher of claim 1, wherein the dc constant current source is a voltage-stabilizing integrated circuit.
5. The remote direct current switch signal matcher as claimed in claims 1 to 4, wherein the direct current constant current source is a circuit composed of a power supply integrated chip LM317 and a constant current preset resistor R1; the dummy load is a resistor R2, and the adjusting resistor is an adjustable resistor RT; the IN pin of the power integrated chip LM317 is connected to a constant current power supply VCC, the OUT pin is connected to one end of a constant current preset resistor R1, and the other end of the constant current preset resistor R1 is connected to the ADJ pin of the power integrated chip LM317, one end of a resistor R2, and one end of the input terminal Switch _ IN, respectively; the other end of the input end Switch _ in is respectively connected with one end of the output end Switch _ out and one end of the adjustable resistor RT; the other end of the adjustable resistor RT is connected to the other end of the resistor R2, the other end of the output terminal Switch _ out, and the constant current source GND, respectively.
CN202010418540.7A 2020-05-18 2020-05-18 Remote direct current switch signal matcher Pending CN113691250A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114501177A (en) * 2021-12-30 2022-05-13 江西飞尚科技有限公司 Distributed data acquisition method, system, storage medium and equipment

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1673695A (en) * 2005-04-21 2005-09-28 上海大学 Tester for electromagnetic flowmeter signal converter
JP2007142057A (en) * 2005-11-17 2007-06-07 Matsushita Electric Ind Co Ltd Light emitting diode driving device, and semiconductor device for driving light emitting diode
CN109885121A (en) * 2019-03-22 2019-06-14 西安微电子技术研究所 A kind of current/frequency conversion circuit
CN212486477U (en) * 2020-05-18 2021-02-05 湖南工业大学 Remote direct current switch signal matcher
CN113691247A (en) * 2020-05-18 2021-11-23 湖南工业大学 Remote alternating current-direct current switch signal matcher

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1673695A (en) * 2005-04-21 2005-09-28 上海大学 Tester for electromagnetic flowmeter signal converter
JP2007142057A (en) * 2005-11-17 2007-06-07 Matsushita Electric Ind Co Ltd Light emitting diode driving device, and semiconductor device for driving light emitting diode
CN109885121A (en) * 2019-03-22 2019-06-14 西安微电子技术研究所 A kind of current/frequency conversion circuit
CN212486477U (en) * 2020-05-18 2021-02-05 湖南工业大学 Remote direct current switch signal matcher
CN113691247A (en) * 2020-05-18 2021-11-23 湖南工业大学 Remote alternating current-direct current switch signal matcher

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114501177A (en) * 2021-12-30 2022-05-13 江西飞尚科技有限公司 Distributed data acquisition method, system, storage medium and equipment

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