CN216696446U - Signal machine current acquisition unit, device and system - Google Patents
Signal machine current acquisition unit, device and system Download PDFInfo
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- CN216696446U CN216696446U CN202123117248.0U CN202123117248U CN216696446U CN 216696446 U CN216696446 U CN 216696446U CN 202123117248 U CN202123117248 U CN 202123117248U CN 216696446 U CN216696446 U CN 216696446U
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Abstract
The application relates to a signal machine current acquisition unit, a device and a system. The method comprises the following steps: the current acquisition module comprises a first current transformer and a second current transformer; the homonymous end of the first current transformer is connected with the homonymous end of the second current transformer; the primary side of the second current transformer is used for measuring the current of the signal machine, and the synonym end of the second current transformer is used for being connected with a power supply; the amplifying module comprises a first amplifier, a second amplifier and a diode; the non-inverting input end of the first amplifier is connected with the synonym end of the second current transformer; the inverting input end of the first amplifier is connected with the synonym end of the first current transformer; the output end of the first amplifier is connected with the non-inverting input end of the second amplifier; the inverting input end of the second amplifier is connected with the cathode of the diode; the anode of the diode is connected with the synonym end of the second current transformer; the output module is connected with the output end of the second amplifier. The signal machine current acquisition device and the signal machine current acquisition method can improve the anti-interference capacity in the signal machine current acquisition process.
Description
Technical Field
The application relates to the technical field of current collection, in particular to a signal machine current collection unit, a device and a system.
Background
In the CTC (Centralized Traffic Control System, dispatch Centralized Control System), signal machine current collection boards are generally installed on a signal machine room combination cabinet in a Centralized manner, each signal machine uses a collection board, each collection board is provided with three identical circuit units, each circuit unit collects a signal machine light position (one line in a power supply line for the signal machine light position in an outdoor area passes through a current transformer in the circuit unit), namely, each district signal machine uses a current collection board. When a certain lamp position of the interval signal machine is out of light, a corresponding circuit unit on a current collecting plate of the interval signal machine outputs a low level; when a certain lamp position of the interval signal machine is lighted, the corresponding circuit unit on the current collecting plate of the interval signal machine outputs high level.
When an interphone is used near a combination cabinet equipped with a current collecting plate of a traffic signal, for example, about 1 meter near the combination cabinet, a section signal of a CTC device may be disordered. In the implementation process, the inventor finds that at least the following problems exist in the conventional technology: the current acquisition mode or the traditional method of the current of the signal machine has the problems of poor interference resistance and the like in the current acquisition process.
SUMMERY OF THE UTILITY MODEL
In view of the foregoing, it is necessary to provide a signaling device current collection unit, a device, and a system that can improve interference rejection during current collection.
In order to achieve the above object, in one aspect, an embodiment of the present application provides a semaphore current collection unit, including:
the current acquisition module comprises a first current transformer and a second current transformer; the homonymous end of the first current transformer is connected with the homonymous end of the second current transformer; the primary side of the second current transformer is used for measuring the current in a lighting line of the signal machine, and the synonym end of the second current transformer is used for being connected with a power supply;
the amplifying module comprises a first amplifier, a second amplifier and a diode; the non-inverting input end of the first amplifier is connected with the synonym end of the second current transformer; the inverting input end of the first amplifier is connected with the synonym end of the first current transformer; the output end of the first amplifier is connected with the non-inverting input end of the second amplifier; the inverting input end of the second amplifier is connected with the cathode of the diode; the anode of the diode is connected with the synonym end of the second current transformer;
and the output module is connected with the output end of the second amplifier and used for outputting the level.
In one embodiment, the current collection module further comprises a first resistor and a second resistor; the first resistor is connected with the first current transformer in parallel; the second resistor is connected in parallel with the second current transformer.
In one embodiment, the amplifying module further comprises a first capacitor, a second capacitor, and a third resistor;
two ends of the first capacitor are respectively connected with two input ends of the first amplifier;
the second capacitor is connected with the two ends of the third resistor in parallel; one end of the second capacitor is connected with the inverting input end of the first amplifier, and the other end of the second capacitor is connected with the output end of the first amplifier.
In one embodiment, the amplifying module further comprises a fourth resistor, a filter capacitor and a slide rheostat;
the power supply end of the first amplifier is used for being connected with a power supply; the output end of the first amplifier is connected with the non-inverting input end of the second amplifier through a fourth resistor;
the positive electrode of the filter capacitor is connected with the non-inverting input end of the second amplifier; the negative electrode of the filter capacitor is connected with the synonym end of the second current transformer;
one end of the slide rheostat is connected with the inverting input end of the second amplifier; the other end of the slide rheostat is used for being connected with a power supply.
In one embodiment, the amplifying module further comprises a fifth resistor;
one end of the slide rheostat is connected with the inverting input end of the second amplifier through a fifth resistor.
In one embodiment, the output module comprises a first output resistor and a second output resistor; the output end of the second amplifier is respectively connected with one end of the first output resistor and one end of the second output resistor; the other end of the first output resistor and the other end of the second output resistor are used for outputting the level.
In one embodiment, the first amplifier and the second amplifier are two operational amplifiers of a dual operational amplifier.
In one embodiment, the first current transformer and the second current transformer are the same in type and parameters.
In one embodiment, the present application provides a semaphore current acquisition device comprising a plurality of semaphore current acquisition units as described above.
In one embodiment, the application provides a semaphore current acquisition system, which comprises the semaphore current acquisition device.
One of the above technical solutions has the following advantages and beneficial effects:
the current acquisition module is through adopting two current transformer of series connection in opposite directions, and signal machine point lamp line only passes from a current transformer, and any circuit is not gone into to another current transformer's primary side in series, and the interfering signal size that two current transformer secondary sides were inducted can offset each other, can improve the interference killing feature.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a block diagram of a current collection unit of a traffic signal in one embodiment;
fig. 2 is a schematic circuit diagram of a semaphore current acquisition unit in an embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements should not be limited by these terms. These terms are only used to distinguish one element from another.
Spatial relational terms, such as "under," "below," "under," "over," and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "under" can encompass both an orientation of above and below. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
It should be noted that the CTC device acquires information of signal devices in a station from a microcomputer through an RS-422 or RJ-45 interface in an interlocking manner, and acquires lighting information of an interval signal by using a signal current acquisition board.
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, as shown in fig. 1, there is provided a semaphore current acquisition unit comprising:
the current acquisition module 110 comprises a first current transformer and a second current transformer; the homonymous end of the first current transformer is connected with the homonymous end of the second current transformer; the primary side of the second current transformer is used for measuring the current in a lighting line of the signal machine, and the synonym end of the second current transformer is used for being connected with a power supply;
specifically, the first current transformer and the second current transformer are reversely connected in series (the same-name ends are connected with each other) for use, the lighting line of the signal machine only passes through the primary side of the second current transformer, and the primary side of the first current transformer is not connected in series with any circuit; the synonym end of the second current transformer is used for being connected with the negative electrode of the power supply;
in some examples, the synonym terminal of the second current transformer is for connection with the negative pole of a 12V power supply;
in one embodiment, as shown in fig. 2, the first current transformer and the second current transformer are the same in type and parameters.
Specifically, because the distance between the two current transformers is far smaller than the distance between the two current transformers and an interference source (for example, a handheld interphone), the distance between the two current transformers and the interference source can be approximately considered to be equal, and because the models and parameters of the two current transformers are the same, interference signals induced by the secondary sides of the two current transformers are equal in size and opposite in phase, and can be basically offset mutually, so that the anti-interference capability can be provided.
In one embodiment, as shown in fig. 2, the current collecting module further includes a first resistor RG1 and a second resistor RG 2; the first resistor RG1 is connected with the first current transformer in parallel; a second resistor RG2 is connected in parallel with the second current transformer.
Specifically, since the first amplifier IC1 in the amplification module 120: a and second amplifier IC1: b has a high input impedance, and a first resistor RG1 and a second resistor RG2 are respectively added to the secondary sides of the first current transformer and the second current transformer, and the first resistor RG1 and the second resistor RG2 serve as impedance matching resistors, so that the current mutual inductance ratio between the primary side and the secondary side of the current transformer can operate in a linear region, that is, the output current on the secondary side of the current transformer varies in proportion to the input current on the primary side.
In some examples, the first resistor RG1 and the second resistor RG2 may each have a resistance of 2K Ω.
An amplification module 120 comprising a first amplifier IC1: A. second amplifier IC1: b and a diode Z; first amplifier IC1: the in-phase input end of the A is connected with the synonym end of the second current transformer; first amplifier IC1: the inverting input end of the A is connected with the synonym end of the first current transformer; first amplifier IC1: output of a and second amplifier IC1: the non-inverting input end of the B is connected; second amplifier IC1: the inverting input end of the B is connected with the cathode of the diode Z; the anode of the diode Z is connected with the synonym end of the second current transformer;
specifically, the first amplifier IC1: the non-inverting input of a may be directly connected to the negative terminal of the power supply, the first amplifier IC1: the inverting input end of the A can be connected with the negative electrode of the power supply through the secondary side of the first current transformer, and can form a half-wave rectification amplifying circuit for the secondary side output signal of the current acquisition module 110;
second amplifier IC1: b may form a voltage comparison circuit, second amplifier IC1: b may be connected to a reference voltage, and the second amplifier IC1: when the input voltage of the non-inverting input terminal of B (i.e., the output voltage of the first amplifier IC1: A) is greater than the reference voltage, the second amplifier IC1: b, outputting a high level, otherwise, outputting a low level;
in some examples, the first amplifier IC1: the non-inverting input of a may be directly connected to the negative pole of the 12V power supply, the first amplifier IC1: the inverting input end of the A can be connected with the cathode of a 12V power supply through the secondary side of the first current transformer; first amplifier IC1: a and second amplifier IC1: b may be an operational amplifier; the reference voltage may be 2V.
In one embodiment, as shown in fig. 2, the amplifying module further includes a first capacitor CG1, a second capacitor CG2, and a third resistor R1;
two ends of the first capacitor CG1 are respectively connected to the first amplifier IC1: the two input ends of A are connected;
the second capacitor CG2 is connected in parallel with two ends of the third resistor R1; one end of the second capacitor CG2 is connected to the first amplifier IC1: the inverting input of a is connected, and the other end is connected to a first amplifier IC1: and the output end of A is connected.
Specifically, the frequency of the useful signal (the current on the traffic light line passing through the current transformer) is 50 hz, the frequency of the interfering signal (for example, the signal emitted from the handheld intercom) is about several hundred mhz, and the frequency of the first amplifier IC1: the first capacitor CG1 and the second capacitor CG2 are added around a, which can effectively reduce the capacitance of the first amplifier IC1: and A is the amplification factor of the high-frequency interference signal.
In some examples, the capacitance values of the first capacitor CG1 and the second capacitor CG2 may each be 1000 pF.
In one embodiment, as shown in fig. 2, the amplifying module further includes a fourth resistor R2, a filter capacitor C1, and a sliding varistor W;
first amplifier IC1: the power supply end of A is used for being connected with a power supply; first amplifier IC1: the output end of A is connected with a second amplifier IC1 through a fourth resistor R2: the non-inverting input end of the B is connected;
the anode of the filter capacitor C1 and the second amplifier IC1: the non-inverting input end of the B is connected; the negative electrode of the filter capacitor C1 is connected with the synonym end of the second current transformer;
one end of the sliding varistor W is connected to the second amplifier IC1: the inverting input end of the B is connected; the other end of the slide rheostat W is used for connecting with a power supply.
Specifically, the fourth resistor R2 and the filter capacitor C1 may form a filter circuit; the other end of the slide rheostat W can be connected with the positive electrode of a power supply; when the current input at the primary side of the current collection module 110 is large enough (for example, greater than 120mA), the rectified signal output by the first amplifier IC1: a is also large, so that the voltage on the filter capacitor C1 is greater than the reference voltage (for example, 2V), the second amplifier IC1: B outputs a high level, which indicates that the collected light level of the semaphore is in a lighting state, and can output the high level to other devices of the CTC; conversely, when the current input to the primary side of the current collecting module 110 is small (e.g., less than 80mA), the rectified signal output by the first amplifier IC1: a is also small, so that the voltage across the filter capacitor C1 is smaller than the reference voltage.
In some examples, the other end of the sliding varistor W may be connected to the positive pole of a 12V power supply; the resistance of the sliding varistor W can be adjusted between 0 Ω and 5000k Ω.
In one embodiment, as shown in fig. 2, the amplifying module further includes a fifth resistor R3;
one end of the sliding rheostat W is connected with the second amplifier IC1 through a fifth resistor R3: and the inverting input end of the B is connected.
Specifically, the resistance of the fifth resistor R3 may be 500 Ω.
In one embodiment, as shown in fig. 2, the first amplifier IC1: a and second amplifier IC1: b are two operational amplifiers in the dual operational amplifier respectively.
Specifically, the first amplifier IC1: a and second amplifier IC1: b can be two operational amplifiers on the same LM358 chip;
in some examples, the first amplifier IC1: pin 3 of the non-inverting input of a can be directly connected to the negative pole of a 12V power supply, and the first amplifier IC1: the 2 pin of the inverting input end of the A can be connected with the cathode of a 12V power supply through the secondary side of a first current transformer, and can form a half-wave rectification amplifying circuit for a secondary side output signal of the current acquisition module 110; first amplifier IC1: the output end of A is 1 pin; first amplifier IC1: a power supply end of A is 4 feet and can be connected with the negative pole of a 12V power supply; first amplifier IC1: the other power supply end of the A is an 8-pin power supply and can be connected with the positive pole of a 12V power supply;
second amplifier IC1: b may form a voltage comparison circuit, second amplifier IC1: b may be connected to a reference voltage at the inverting input terminal 6, and the second amplifier IC1: when the input voltage of the pin 5 of the non-inverting input terminal of B (i.e., the output voltage of the first amplifier IC1: A) is greater than the reference voltage, the second amplifier IC1: b, outputting a high level, otherwise, outputting a low level; second amplifier IC1: the output end of B is 7 pins;
In one embodiment, as shown in fig. 2, the output module includes a first output resistor R4 and a second output resistor R5; second amplifier IC1: the output end of the B is respectively connected with one end of a first output resistor R4 and one end of a second output resistor R5; the other end of the first output resistor R4 and the other end of the second output resistor R5 are used for output level.
Specifically, when a current larger than the first current threshold is passed through a lighting line (the primary side of the current collection module 110) of the traffic signal, the other end of the first output resistor R4 and the other end of the second output resistor R5 output a high level, which indicates that the collected light level of the traffic signal is in a lighting state; when the current on the lighting line of the annunciator (the primary side of the current collecting module 110) is smaller than the second current threshold 80mA, the other end of the first output resistor R4 and the other end of the second output resistor R5 output low levels, which indicates that the collected light level of the annunciator is in a light-off state;
in some examples, the first output resistor R4 may have a resistance of 1k Ω; the second output resistor R5 may have a resistance of 3.6k Ω; the first current threshold may be 120 mA; the second current threshold may be 80 mA.
In one embodiment, the present application provides a semaphore current acquisition device comprising a plurality of semaphore current acquisition units as described above.
Specifically, the annunciator current acquisition device may include three annunciator current acquisition units as described above; every semaphore current acquisition unit gathers a semaphore lamp position (to an outdoor interval semaphore lamp position in the power supply line, pass current transformer in the circuit unit), and every interval semaphore uses a semaphore current acquisition device.
In some examples, when a certain light position of the interval signal is extinguished, the corresponding signal current acquisition unit of the signal current acquisition device outputs a low level; on the contrary, when a certain lamp position of the interval signal machine is lighted, the corresponding signal machine current acquisition unit of the signal machine current acquisition device outputs high level; the traffic signal current collection device can maintain stable and normal operation by using an interphone (for example, a handheld interphone with the power of 5W in a transmitting state) which is 10 cm away from the traffic signal current collection device.
In one embodiment, the application provides a semaphore current acquisition system, which comprises the semaphore current acquisition device.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A semaphore current acquisition unit, comprising:
the current acquisition module comprises a first current transformer and a second current transformer; the homonymous end of the first current transformer is connected with the homonymous end of the second current transformer; the primary side of the second current transformer is used for measuring the current in a lighting line of a signal machine, and the synonym end of the second current transformer is used for being connected with a power supply;
the amplifying module comprises a first amplifier, a second amplifier and a diode; the in-phase input end of the first amplifier is connected with the synonym end of the second current transformer; the inverting input end of the first amplifier is connected with the synonym end of the first current transformer; the output end of the first amplifier is connected with the non-inverting input end of the second amplifier; the inverting input end of the second amplifier is connected with the cathode of the diode; the anode of the diode is connected with the synonym end of the second current transformer;
and the output module is connected with the output end of the second amplifier and used for outputting the level.
2. The semaphore current acquisition unit of claim 1,
the current acquisition module further comprises a first resistor and a second resistor; the first resistor is connected with the first current transformer in parallel; the second resistor is connected with the second current transformer in parallel.
3. The semaphore current acquisition unit of claim 1, wherein the amplification module further comprises a first capacitor, a second capacitor, and a third resistor;
two ends of the first capacitor are respectively connected with two input ends of the first amplifier;
the second capacitor is connected with two ends of the third resistor in parallel; one end of the second capacitor is connected with the inverting input end of the first amplifier, and the other end of the second capacitor is connected with the output end of the first amplifier.
4. The semaphore current acquisition unit of claim 1, wherein the amplification module further comprises a fourth resistor, a filter capacitor, and a sliding rheostat;
the power supply end of the first amplifier is used for being connected with the power supply; the output end of the first amplifier is connected with the non-inverting input end of the second amplifier through the fourth resistor;
the positive electrode of the filter capacitor is connected with the non-inverting input end of the second amplifier; the negative electrode of the filter capacitor is connected with the synonym end of the second current transformer;
one end of the slide rheostat is connected with the inverting input end of the second amplifier; and the other end of the sliding rheostat is used for being connected with the power supply.
5. The semaphore current acquisition unit of claim 4, wherein the amplification module further comprises a fifth resistor;
one end of the slide rheostat is connected with the inverting input end of the second amplifier through the fifth resistor.
6. The semaphore current acquisition unit of claim 1,
the output module comprises a first output resistor and a second output resistor; the output end of the second amplifier is respectively connected with one end of the first output resistor and one end of the second output resistor; the other end of the first output resistor and the other end of the second output resistor are used for outputting electrical level.
7. The semaphore current acquisition unit of claim 1,
the first amplifier and the second amplifier are two operational amplifiers in a dual operational amplifier respectively.
8. The semaphore current collection unit of any one of claims 1-7, wherein the first current transformer and the second current transformer are of the same type and parameters.
9. A semaphore current collection device comprising a plurality of semaphore current collection units according to any of claims 1-8.
10. A semaphore current acquisition system comprising the semaphore current acquisition device of claim 9.
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| CN202123117248.0U CN216696446U (en) | 2021-12-13 | 2021-12-13 | Signal machine current acquisition unit, device and system |
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| CN202123117248.0U CN216696446U (en) | 2021-12-13 | 2021-12-13 | Signal machine current acquisition unit, device and system |
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