CN113655270A - Detection device and method for acquisition circuit of annunciator - Google Patents
Detection device and method for acquisition circuit of annunciator Download PDFInfo
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Abstract
The invention provides a detection device and a method for a signal machine acquisition circuit, wherein the device comprises: the device comprises a current acquisition circuit, a control circuit and a detection module; the current acquisition circuit is connected with the control circuit in series and is electrically connected with the detection module; the control circuit comprises a load resistor, a signal machine, a switch element and a power supply; the switching element is connected in series with the load resistor and then connected in parallel with the power supply and the signal machine; the current acquisition circuit is used for respectively acquiring the output current of the control circuit under the conditions that the switch element is in a closed state and an open state; the detection module is used for determining whether the current acquisition circuit is abnormal or not according to the difference value of the output currents of the control circuit under the conditions that the switch element is in the closed state and the open state. The invention realizes the self-checking of the current acquisition circuit and effectively improves the safety of the interlocking system of the annunciator.
Description
Technical Field
The invention relates to the technical field of rail transit, in particular to a detection device and a detection method for a signal machine acquisition circuit.
Background
The signal machine is the basic equipment of a railway signal system, and is also a very important signal equipment. In the semaphore control circuit of rail transit, usually with one or more relay series connection on the control circuit of semaphore, the interchange high voltage that once inclines flows through the relay contact, accomplishes 13 ~ 14V alternating current again and to the conversion of direct current inside the semaphore, finally realizes the power supply to the luminescent disc, lights the semaphore.
As shown in fig. 1, a conventional annunciator control circuit is implemented by an IO (Input or Output) signal and a relay group. The IO control relay group acts to control whether the alternating voltage of the annunciator is connected to the annunciator or to achieve the functions of lighting and extinguishing the light. The acquisition circuit is completed by the relay contact and the filament alarm instrument, the current sensor of the filament alarm instrument is connected in series in the control loop of the annunciator, and meanwhile, the voltage acquisition point of the filament alarm instrument acquires the output voltage of the annunciator and judges whether the annunciator carries out output action according to the output voltage.
The filament alarm instrument is provided with current upper and lower limit information of the annunciator, and the judgment of fault modes such as filament breakage of the annunciator, output current overrun and the like is realized by matching the data of the current sensor and the data of the voltage acquisition point. If the machine fails, an alarm relay in the filament alarm instrument is driven to output alarm information to the interlocking system.
However, the acquisition circuit does not have self-checking capability, and when a filament alarm in the acquisition circuit fails, the alarm function may fail. Under the condition, the interlocking system has mistaken lamp lighting or cannot give an alarm for the fault of the annunciator in time, so that the safety of the interlocking system is greatly reduced.
Disclosure of Invention
The invention provides a detection device and a detection method for a signal acquisition circuit, which are used for solving the defect of poor safety of an interlocking system caused by the fact that the acquisition circuit does not have a self-checking function in the prior art, realizing detection on the signal acquisition circuit and improving the safety of the interlocking system.
The invention provides a detection device for a signal machine acquisition circuit, which comprises: the device comprises a current acquisition circuit, a control circuit and a detection module;
the current acquisition circuit is connected with the control circuit in series and is electrically connected with the detection module;
the control circuit comprises a load resistor, a signal machine, a switch element and a power supply;
the switching element is connected in series with the load resistor and then connected in parallel with the power supply and the signal machine;
the current acquisition circuit is used for respectively acquiring the output current of the control circuit under the conditions that the switch element is in a closed state and an open state;
the detection module is used for determining whether the current acquisition circuit is abnormal or not according to the difference value of the output currents of the control circuit under the conditions that the switch element is in the closed state and the open state.
According to the detection device of the signal acquisition circuit, the detection module is used for determining whether the current acquisition circuit is abnormal or not according to the difference value of the output currents of the control circuit before and after switching under the condition that the switching element is switched from the open state to the closed state; and under the condition that the switching element is switched from a closed state to an open state, determining whether the current acquisition circuit is abnormal or not according to the difference value of the output currents of the control circuit before and after switching.
According to the detection device of the signal machine acquisition circuit, the switch element comprises an optical coupler and a first relay;
wherein the optocoupler is connected in series with the first relay;
and a first contact of the first relay is electrically connected with the load resistor, and a second contact of the first relay is electrically connected with the signal machine and the power supply.
According to the detection device of the signal machine acquisition circuit, provided by the invention, under the condition that an input signal of the optical coupler is a first level signal, the first contact and the second contact are both in a closed state, and the switch element is in a closed state;
and under the condition that the input signal of the optical coupler is a second level signal, the first contact and the second contact are both in an off state, and the switch element is in the off state.
According to the detection device of the signal machine acquisition circuit provided by the invention, the current acquisition circuit comprises a current sensor, an operational amplification circuit and an AD conversion circuit;
the current sensor is connected with an operational amplifier circuit in series, and the operational amplifier circuit is connected with an AD conversion circuit in series;
the current sensor is used for acquiring the output current of the control circuit under the conditions that the switch element is in a closed state and an open state;
the operational amplification circuit is used for amplifying the output current of the control circuit under the condition that the switching element is in a closed state and an open state;
the AD conversion circuit is used for converting the amplified output current from analog quantity to digital quantity.
According to the detection device of the signal machine acquisition circuit, the control circuit further comprises a second relay;
the second relay is connected with the annunciator in series and then connected with the load resistor and the power supply in parallel;
the second relay is used for carrying out safety protection on the control circuit.
According to the detection device of the signal acquisition circuit, the second relay comprises a safety relay and a solid-state relay;
the safety relay is connected with the solid-state relay in series;
the safety relay comprises a first safety relay and a second safety relay;
the solid-state relay is connected with the first safety relay in series, the first safety relay is connected with the annunciator in series, and the annunciator is connected with the second safety relay in series.
According to the detection device of the acquisition circuit of the annunciator, provided by the invention, the current acquisition circuit is also used for acquiring the output current of the annunciator;
the detection module is further used for detecting whether the output current of the annunciator is within a preset range or not and determining whether the annunciator is abnormal or not according to a detection result.
According to the detection device of the acquisition circuit of the annunciator, provided by the invention, the current acquisition circuit, the control circuit and the detection module are integrated in the same substrate.
The invention also provides a detection method of the detection device based on the acquisition circuit of the signaler, which comprises the following steps:
after the switching element is connected with the load resistor in series, the switching element is connected with a power supply and a signal machine in parallel to form a control circuit;
a current acquisition circuit is adopted to acquire the output current of the control circuit under the conditions that the switch element is in a closed state and an open state;
and determining whether the current acquisition circuit is abnormal or not by adopting a detection module according to the difference value of the output currents of the control circuit under the conditions that the switch element is in a closed state and an open state.
The detection device and the detection method of the acquisition circuit of the signaler provided by the invention control whether the load resistor is connected in parallel with the control circuit or not through the state of the switching element, and determine whether the current acquisition circuit is abnormal or not according to the difference value of the output current of the control circuit under the conditions of the closed state and the open state of the switching element, so that the self-detection of the current acquisition circuit is realized, and the safety of an interlocking system is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art semaphore acquisition circuit;
fig. 2 is one of the structural schematic diagrams of the detection device of the signal acquisition circuit provided by the invention;
fig. 3 is a second schematic structural diagram of the detecting device of the signal acquisition circuit provided by the present invention;
fig. 4 is a third schematic structural diagram of the detection device of the acquisition circuit of the annunciator provided by the invention;
fig. 5 is a schematic flow chart of a detection method of the detection device based on the semaphore-based acquisition circuit provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The detection device of the acquisition circuit of the signaler according to the present invention is described below with reference to fig. 2, and includes: the device comprises a current acquisition circuit, a control circuit and a detection module; the current acquisition circuit is connected with the control circuit in series and is connected with the detection module;
wherein, the current acquisition circuit is connected in series with the control circuit. When the current in the control circuit flows through the current acquisition circuit, the current acquisition circuit acquires the output current of the control circuit.
The detection module is used for detecting the current acquisition circuit according to the output current acquired by the current acquisition circuit.
The control circuit comprises a load resistor, a signal machine, a switch element and a power supply;
wherein, the power supply is an alternating current power supply. The alternating current power supply is used for providing alternating current for the load resistor and/or the signal machine.
The alternating voltage and the frequency output by the alternating current power supply can be set according to actual requirements, such as 110V and 50HZ respectively.
The number of the signals may be plural, and this embodiment is not particularly limited thereto.
The switch element may be composed of one or more relays, may also be composed of one or more optocouplers, and may also be composed of an optocoupler and a relay, which is not specifically limited in this embodiment.
The switching element is connected in series with the load resistor and then connected in parallel with the power supply and the signal machine;
optionally, one end of the switching element is connected with the load resistor, and the other end of the switching element is connected with the alternating current power supply and the signal machine;
the branch circuit formed by connecting the switch element and the load resistor in series is positioned on the branch circuit between the alternating current power supply and the signal machine and is connected with the branch circuit where the alternating current power supply is positioned and the branch circuit where the signal machine is positioned in parallel.
The current acquisition circuit is used for respectively acquiring the output current of the control circuit under the conditions that the switch element is in a closed state and an open state;
optionally, the current collecting circuit is connected in series with the control circuit, and can collect the output current of the control circuit in real time.
Alternatively, when the switching element is in a closed state, a path is formed between the load resistor and the switching element, and at this time, the load resistor is connected in parallel with the traffic signal and the ac power supply, and the control circuit is connected in parallel in this order by the ac power supply, the load resistor, and the traffic signal.
Accordingly, the alternating current power supply can provide alternating current for the load resistor and can also provide alternating current for the signal machine. The output current of the control circuit acquired by the current acquisition circuit is the current output by the load resistor and the signal machine together.
Alternatively, when the switching element is turned off, the path between the load resistor and the switching element is opened, and at this time, the load resistor is disconnected from both the traffic signal and the ac power supply, and the control circuit is connected in series by the ac power supply and the traffic signal.
Accordingly, the ac power supply supplies only ac power to the traffic signal. The output current of the control circuit collected by the current collecting circuit is only the current output by the annunciator.
The detection module is used for determining whether the current acquisition circuit is abnormal or not according to the difference value of the output currents of the control circuit under the conditions that the switch element is in the closed state and the open state.
Optionally, under a normal condition of the current collection circuit, when the load resistor is connected in parallel to the control circuit and the load resistor is not connected to the control circuit, a difference between output currents of the control circuit collected by the current collection circuit is Δ I ═ U/R1, where U is a voltage output by the ac power supply, and R1 is a resistance of the load resistor.
A corresponding threshold range may be set according to Δ I, e.g., P ═ Δ I ± epsilon.
When the difference value of the output current of the control circuit is within the threshold range under the conditions that the switching element is in the closed state and the open state, determining that the current acquisition circuit is in the normal state; and when the difference value of the output current of the control circuit is not within the threshold range under the conditions that the switching element is in the closed state and the open state, determining that the current acquisition circuit is abnormal.
Whether the load resistor is connected in parallel to the control circuit is controlled through the state of the switch element, and whether the current acquisition circuit is abnormal or not is determined according to the difference value of the output current of the control circuit under the conditions of the closed state and the open state of the switch element, so that the self-checking of the current acquisition circuit is realized, and the safety of the interlocking system is effectively improved.
On the basis of the above embodiment, in this embodiment, the detection module is configured to determine whether the current collection circuit is abnormal according to a difference between output currents of the control circuit before and after switching when the switching element is switched from the open state to the closed state; and under the condition that the switching element is switched from a closed state to an open state, determining whether the current acquisition circuit is abnormal or not according to the difference value of the output currents of the control circuit before and after switching.
Optionally, under a normal condition of the current collecting circuit, when the switching element is switched from the open state to the closed state, the load resistor is switched from the state of not accessing the control circuit to the state of accessing the control circuit.
At this time, the difference between the difference of the output currents of the control circuit after switching and before switching collected by the current collecting circuit is + U/R1, and a corresponding first threshold range, such as P ═ Δ I ± epsilon, may be set according to Δ I.
When the difference value between the difference values of the output currents of the control circuit after switching and before switching is within a first threshold range, determining that the current acquisition circuit is in a normal state; and when the difference value between the difference values of the output currents of the control circuit after switching and the output currents of the control circuit before switching is not within the first threshold range, determining that the current acquisition circuit is abnormal.
Optionally, under a normal condition of the current collecting circuit, when the switching element is switched from the closed state to the open state, the load resistance is switched from the state of being connected to the control circuit to the state of not being connected to the control circuit.
At this time, the difference between the output currents of the control circuit after switching and before switching collected by the current collecting circuit is-U/R1, and the corresponding second threshold range may be set according to Δ I.
Correspondingly, when the difference value between the difference values of the output currents of the control circuit after switching and the control circuit before switching is within the second threshold value range, the current acquisition circuit is determined to be in a normal state; and when the difference value between the difference values of the output currents of the control circuit after switching and the output currents of the control circuit before switching is not within the second threshold range, determining that the current acquisition circuit is abnormal.
According to the difference of the output current of the switching element control circuit before and after the switching state, the self-checking function of the current acquisition circuit can be realized, the operation is simple, and the expansibility is strong.
On the basis of the above embodiments, the switching element in this embodiment includes an optocoupler and a first relay; wherein the optocoupler is connected in series with the first relay; and a first contact of the first relay is electrically connected with the load resistor, and a second contact of the first relay is electrically connected with the signal machine and the power supply.
The optical coupler is a conversion device which transmits an electric signal by taking light as a medium and converts electricity into light and then electricity. Mainly comprises a luminous source and a light receiver. The light source and the light receiver are assembled in the same closed shell and are isolated from each other by a transparent insulator. The pin of the light emitting source is an input end, and the pin of the light receiver is an output end.
The light emitting source of the optocoupler includes a light emitting diode, and the light receiving device includes a photodiode or a phototriode, etc., which is not limited optionally in this embodiment.
The first relay is a photovoltaic relay which comprises a diode and two series-connected triodes.
Wherein, photovoltaic relay's contact quantity can set up according to actual demand, for example 6. As shown in fig. 3, the first contact numbered 4 is connected to the load resistor, the second contact numbered 6 is connected to the annunciator and the ac power supply, the third contact numbered 1 is connected to the dc power supply, and the fourth contact numbered 2 is connected to the output terminal of the opto-coupler.
This embodiment adopts opto-coupler and photovoltaic relay, and the access control circuit that can the effective control load resistance or from control circuit break-off connection to adopt the photoelectricity to keep apart between with load resistance and the semaphore, avoid the semaphore to receive load resistance's interference. In addition, adopt photovoltaic relay can also realize the safety control to control circuit.
On the basis of the above embodiment, in this embodiment, when an input signal of the optical coupler is a first level signal, both the first contact and the second contact are in a closed state, and the switching element is in a closed state; and under the condition that the input signal of the optical coupler is a second level signal, the first contact and the second contact are both in an off state, and the switch element is in the off state.
Wherein, the first level signal is a high level signal; the second level signal is a low level signal.
The input end of the optical coupler is connected with a corresponding resistor R2, and the input end of the resistor R2 is used for receiving a self-checking control signal.
As shown in fig. 3, when the self-checking control signal is a first level signal, the first level signal sequentially passes through the resistor, the optocoupler and the optical relay, so as to trigger the first contact numbered 6 and the second contact numbered 4 to be closed simultaneously. At the moment, the load resistor is connected with the alternating current power supply and the signal machine in parallel;
when the self-checking control signal is a second level signal, the second level signal sequentially passes through the resistor, the optocoupler and the optical relay so as to trigger the first contact numbered 6 and the second contact numbered 4 to be disconnected simultaneously. At this time, the load resistor is disconnected from both the ac power supply and the traffic signal.
According to the embodiment, whether the load resistor is connected into the control circuit or not can be controlled through the high level signal and the low level signal of the self-checking control signal, and the operation is simple.
Optionally, a dc power supply is built in the first relay for supplying power to the first relay.
As shown in fig. 3, the positive electrode of the dc power supply is connected to the contact point of the first relay, which is designated by the reference numeral 1, via a resistor R3, and the negative electrode is connected to the ground.
The power supply of the first relay is realized through the built-in direct-current power supply, so that the effective work of the first relay can be guaranteed, and the first relay is further guaranteed to carry out safety protection on the control circuit.
On the basis of the above embodiments, the current collecting circuit in this embodiment includes a current sensor, an operational amplifier circuit, and an AD converter circuit; the current sensor is connected with an operational amplifier circuit in series, and the operational amplifier circuit is connected with an AD conversion circuit in series; the current sensor is used for acquiring the output current of the control circuit under the conditions that the switch element is in a closed state and an open state; the operational amplification circuit is used for amplifying the output current of the control circuit under the condition that the switching element is in a closed state and an open state; the AD conversion circuit is used for converting the amplified output current from analog quantity to digital quantity.
Alternatively, the current sensor is a hall current sensor or the like, and this embodiment is not particularly limited thereto.
As shown in fig. 4, the current collection circuit is connected in series with the control circuit through the current sensor;
the current sensor comprises two input ends, wherein one input end is connected with an alternating current power supply, and the other input end is connected with a branch where the first relay is located and a branch where the signal machine is located;
the current sensor comprises two output ends which are respectively connected with two input ends of the operational amplification circuit; the output end of the operational amplifier circuit is connected with an Analog to Digital (AD) conversion circuit.
The operational amplifier circuit may be a homodromous summing amplifier circuit, an inverting summing amplifier circuit, or the like, which is not specifically limited in this embodiment.
When the output current of the control circuit flows through the current sensor, the current sensor generates induction current, the induction current is amplified by the operational amplifier circuit and then is sent to the AD conversion circuit, the conversion circuit converts the analog quantity into digital quantity, and the converted digital quantity output current is sent to the detection module, so that the interlocking system can obtain the output current in the control circuit.
In the prior art, the filament alarm instrument can only output alarm information in forms of 0 and 1 to the interlocking system, and when a fault occurs, the root cause of the fault of the control circuit is difficult to obtain from the alarm information, so that the maintainability and the expandability of the interlocking system are reduced.
In this embodiment, continuous and real-time current analog quantity data in the control circuit can be acquired in real time, and the current analog quantity data can be converted into digital quantity, so that the maintainability and expandability of the interlock system are effectively improved, and a maintainer can quickly acquire the root cause of the fault of the control circuit according to the specific ground current analog quantity data and digital quantity.
On the basis of the above embodiments, in this embodiment, the control circuit further includes a second relay; the second relay is connected with the annunciator in series and then connected with the load resistor and the power supply in parallel; the second relay is used for carrying out safety protection on the control circuit.
The relay is an electric appliance which enables the controlled quantity to generate a preset step change in the electric output circuit when the change of the input quantity reaches a set value; the circuit has the functions of automatic regulation, safety protection, circuit conversion and the like.
Optionally, a branch of the second relay connected in series with the annunciator is connected in parallel with a branch of the load resistor and a branch of the alternating-current power supply;
the number of the second relays can be set according to actual requirements, such as three.
The safety protection of the control circuit can be realized by adopting the second relay in the embodiment.
On the basis of the above embodiments, the second relay in this embodiment includes a safety relay and a solid-state relay; the safety relay is connected with the solid-state relay in series.
Wherein, the quantity of solid state relay and safety relay can set up according to actual demand.
The solid relay, the safety relay and the signal lamp are connected in series on the same branch.
The output control of the signal machine is completed by the solid-state relay and the safety relay, and the current output by the alternating current power supply can light the signal machine through the contacts of the solid-state relay and the safety relay.
The safety of the control circuit is ensured by the solid-state relay and the safety relay together, and double protection of the control circuit can be realized.
The safety relay comprises a first safety relay and a second safety relay; the solid-state relay is connected with the first safety relay in series, the first safety relay is connected with the annunciator in series, and the annunciator is connected with the second safety relay in series.
As shown in fig. 4, a branch formed by sequentially connecting the solid-state relay, the first safety relay, the signal and the second safety relay in series is connected in parallel with a branch where the load resistor is located and a branch where the ac power supply is located.
The second safety relay is connected with the load resistor and is connected with a zero line N of the alternating current power supply; first safety relay passes through solid state relay and is connected with the contact that photovoltaic relay serial number is 6, and is connected with alternating current power supply's live wire L.
This embodiment is through setting up a plurality of safety relays and guarantee control circuit's safety jointly, further promotes interlock system's security performance.
On the basis of the above embodiments, in this embodiment, the current collecting circuit is further configured to collect an output current of the semaphore; the detection module is further used for detecting whether the output current of the annunciator is within a preset range or not and determining whether the annunciator is abnormal or not according to a detection result.
Alternatively, in the case where the load resistor is not connected to the control circuit, the control circuit is formed by connecting only the ac power source and the traffic signal in series. At the moment, the output current of the control circuit acquired by the current acquisition circuit is the output current of the signal machine.
Under the condition that the load resistor is connected to the control circuit, the control circuit is formed by connecting an alternating current power supply, the load resistor and the annunciator in parallel, and the output current of the control circuit acquired by the current acquisition circuit at the moment comprises the current output by the load resistor of the output current of the annunciator. The current output by the load resistor may be subtracted from the output current of the control circuit to obtain the output current of the semaphore. The embodiment is not limited to the manner in which the current collection circuit collects the output current of the semaphore.
The detection module can compare the output current of the annunciator with a preset range; if the signal is within the preset range, the signal is normal; if the current is not within the preset range, the signal machine is indicated to be abnormal, and at the moment, the detection module can push the output current of the signal machine to the maintenance system and send out an alarm.
The preset range can be preset or calculated in advance according to actual requirements.
The detection module in this example not only can realize the self-checking function to current acquisition circuit, can also realize the fault detection function to the semaphore. Under the condition that the current acquisition circuit and/or the signal lamp have faults, prompt can be timely made, and the safety integrity level of the system is effectively improved.
On the basis of the above embodiments, in this embodiment, the current collecting circuit, the control circuit, and the detection module are integrated in the same substrate.
Optionally, in the prior art, the filament alarm is disposed outside the annunciator control circuit, and the installation and connection relationship are complex, so that a system architecture formed by the annunciator control circuit and the acquisition circuit in the whole interlock system becomes more complex.
In the embodiment, the current acquisition circuit, the control circuit and the detection module are directly integrated in the same substrate, so that the structure of each module is simple, and the system architecture can be effectively simplified. Simultaneously, can also realize carrying out the self-checking to current acquisition circuit, gather the output current of semaphore in real time to monitor the semaphore.
The following describes a detection method of the detection apparatus based on the semaphore acquisition circuit according to an embodiment of the present invention, and the detection method of the detection apparatus based on the semaphore acquisition circuit described below and the detection apparatus of the semaphore acquisition circuit described above may be referred to in correspondence with each other.
As shown in fig. 5, the present embodiment provides a detection method of a detection apparatus based on a semaphore acquisition circuit, including, step 501, connecting a switching element in series with a load resistor, and then connecting the switching element in parallel with a power supply and a semaphore to form a control circuit;
optionally, one end of the switching element is connected with the load resistor, and the other end of the switching element is connected with the alternating current power supply and the signal machine;
the branch circuit formed by connecting the switch element and the load resistor in series is positioned on the branch circuit between the alternating current power supply and the signal machine and is connected with the branch circuit where the alternating current power supply is positioned and the branch circuit where the signal machine is positioned in parallel.
optionally, the current collecting circuit is connected in series with the control circuit, and can collect the output current of the control circuit in real time.
Alternatively, when the switching element is in a closed state, a path is formed between the load resistor and the switching element, and at this time, the load resistor is connected in parallel with the traffic signal and the ac power supply, and the control circuit is connected in parallel in this order by the ac power supply, the load resistor, and the traffic signal.
Accordingly, the alternating current power supply can provide alternating current for the load resistor and can also provide alternating current for the signal machine. The output current of the control circuit acquired by the current acquisition circuit is the current output by the load resistor and the signal machine together.
Alternatively, when the switching element is turned off, the path between the load resistor and the switching element is opened, and at this time, the load resistor is disconnected from both the traffic signal and the ac power supply, and the control circuit is connected in series by the ac power supply and the traffic signal.
Accordingly, the ac power supply supplies only ac power to the traffic signal. The output current of the control circuit collected by the current collecting circuit is only the current output by the annunciator.
Optionally, under a normal condition of the current collection circuit, when the load resistor is connected in parallel to the control circuit and the load resistor is not connected to the control circuit, a difference between output currents of the control circuit collected by the current collection circuit is Δ I ═ U/R1, where U is a voltage output by the ac power supply, and R1 is a resistance of the load resistor.
The corresponding threshold range can be set according to Δ I.
When the difference value of the output current of the control circuit is within the threshold range under the conditions that the switching element is in the closed state and the open state, determining that the current acquisition circuit is in the normal state; and when the difference value of the output current of the control circuit is not within the threshold range under the conditions that the switching element is in the closed state and the open state, determining that the current acquisition circuit is abnormal.
Whether the load resistor is connected in parallel to the control circuit is controlled through the state of the switch element, and whether the current acquisition circuit is abnormal or not is determined according to the difference value of the output current of the control circuit under the conditions of the closed state and the open state of the switch element, so that the self-checking of the current acquisition circuit is realized, and the safety of the interlocking system is effectively improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a detection device of semaphore acquisition circuit which characterized in that includes: the device comprises a current acquisition circuit, a control circuit and a detection module;
the current acquisition circuit is connected with the control circuit in series and is electrically connected with the detection module;
the control circuit comprises a load resistor, a signal machine, a switch element and a power supply;
the switching element is connected in series with the load resistor and then connected in parallel with the power supply and the signal machine;
the current acquisition circuit is used for respectively acquiring the output current of the control circuit under the conditions that the switch element is in a closed state and an open state;
the detection module is used for determining whether the current acquisition circuit is abnormal or not according to the difference value of the output currents of the control circuit under the conditions that the switch element is in the closed state and the open state.
2. The detection device of the signaler acquisition circuit according to claim 1, wherein the detection module is configured to determine whether the current acquisition circuit is abnormal according to a difference between output currents of the control circuit before and after switching when the switching element is switched from the open state to the closed state; and under the condition that the switching element is switched from a closed state to an open state, determining whether the current acquisition circuit is abnormal or not according to the difference value of the output currents of the control circuit before and after switching.
3. The detecting device of the signaler acquisition circuit according to claim 1, wherein the switching element includes an optical coupler and a first relay;
wherein the optocoupler is connected in series with the first relay;
and a first contact of the first relay is electrically connected with the load resistor, and a second contact of the first relay is electrically connected with the signal machine and the power supply.
4. The detecting device of the signaler collecting circuit according to claim 3, wherein when the input signal of the optocoupler is a first level signal, the first contact and the second contact are both in a closed state, and the switch element is in a closed state;
and under the condition that the input signal of the optical coupler is a second level signal, the first contact and the second contact are both in an off state, and the switch element is in the off state.
5. The detecting device for the signaler acquisition circuit according to any one of claims 1 to 4, wherein the current acquisition circuit includes a current sensor, an operational amplifier circuit and an AD converter circuit;
the current sensor is connected with an operational amplifier circuit in series, and the operational amplifier circuit is connected with an AD conversion circuit in series;
the current sensor is used for acquiring the output current of the control circuit under the conditions that the switch element is in a closed state and an open state;
the operational amplification circuit is used for amplifying the output current of the control circuit under the condition that the switching element is in a closed state and an open state;
the AD conversion circuit is used for converting the amplified output current from analog quantity to digital quantity.
6. The detecting device for the signaler acquisition circuit according to any one of claims 1 to 4, wherein the control circuit further comprises a second relay;
the second relay is connected with the annunciator in series and then connected with the load resistor and the power supply in parallel;
the second relay is used for carrying out safety protection on the control circuit.
7. The semaphore acquisition circuit detection device of claim 6, wherein the second relay comprises a safety relay and a solid state relay;
the safety relay is connected with the solid-state relay in series;
the safety relay comprises a first safety relay and a second safety relay;
the solid-state relay is connected with the first safety relay in series, the first safety relay is connected with the annunciator in series, and the annunciator is connected with the second safety relay in series.
8. The detecting device for the signaler collecting circuit according to any one of claims 1 to 4, wherein the current collecting circuit is further configured to collect an output current of the signaler;
the detection module is further used for detecting whether the output current of the annunciator is within a preset range or not and determining whether the annunciator is abnormal or not according to a detection result.
9. The detecting device for the signal machine collecting circuit according to any one of claims 1 to 4, wherein the current collecting circuit, the control circuit and the detecting module are integrated in the same substrate.
10. A method for detecting a detection device based on the acquisition circuit of the signaling apparatus according to any one of claims 1 to 9, comprising:
after the switching element is connected with the load resistor in series, the switching element is connected with a power supply and a signal machine in parallel to form a control circuit;
a current acquisition circuit is adopted to acquire the output current of the control circuit under the conditions that the switch element is in a closed state and an open state;
and determining whether the current acquisition circuit is abnormal or not by adopting a detection module according to the difference value of the output currents of the control circuit under the conditions that the switch element is in a closed state and an open state.
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| CN202110881319.XA CN113655270A (en) | 2021-08-02 | 2021-08-02 | Detection device and method for acquisition circuit of annunciator |
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