CN107380209B - Detection circuit for controlling switch machine - Google Patents
Detection circuit for controlling switch machine Download PDFInfo
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- CN107380209B CN107380209B CN201710681570.5A CN201710681570A CN107380209B CN 107380209 B CN107380209 B CN 107380209B CN 201710681570 A CN201710681570 A CN 201710681570A CN 107380209 B CN107380209 B CN 107380209B
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- 238000001514 detection method Methods 0.000 title claims abstract description 101
- 230000003287 optical effect Effects 0.000 claims description 62
- 238000000605 extraction Methods 0.000 claims description 31
- 238000011084 recovery Methods 0.000 claims description 19
- 239000003990 capacitor Substances 0.000 claims description 17
- 230000002159 abnormal effect Effects 0.000 claims description 14
- 239000000284 extract Substances 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000007599 discharging Methods 0.000 description 4
- 238000005070 sampling Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000819 phase cycle Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
- B61L5/06—Electric devices for operating points or scotch-blocks, e.g. using electromotive driving means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L23/00—Control, warning or like safety means along the route or between vehicles or trains
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Electric Motors In General (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention provides a detection circuit for controlling a switch machine, which belongs to the field of railway tracks, wherein the detection circuit is provided with a controller, the controller is provided with a first driving end, a second driving end, a first detection end, a second detection end, a first stoping end and a second stoping end, the controller comprises a direction switching module, a first stoping circuit and a second stoping circuit, the input end of the direction switching module is connected with the first driving end and the second driving end, the output end of the direction switching module is connected with the first stoping circuit and the second stoping circuit, the input end of the first stoping circuit is connected with the first detection end, and the output end of the first stoping circuit is connected with the switch machine and the first stoping end. The controller is used for respectively carrying out rechecking on the driving signals output by the first driving end and the second driving end, and whether corresponding stoping signals are acquired according to the first stoping end and the second stoping end or not is judged, so that whether a signal system has an output fault or not can be judged, and the output safety is ensured.
Description
Technical Field
The invention belongs to the field of railway tracks, and particularly relates to a detection circuit for controlling a point switch.
Background
A switch machine is an important actuator for use in rail transit for switching locking switch points or rails, indicating the position and status of the switch point or rail in a supervision-interlock zone. The operation mode of the switch machine is divided into an electric mode and a manual mode, and the equipment is uniformly controlled by a switch controller in an electric mode to realize the positioning and reverse driving of the switch machine when normal; when the power failure or the fault of the switch machine and the corresponding track circuit are caused, the switch is switched by hand operation.
When the switch machine rotates in place, the current on the central line (N line) of the switch machine can be rapidly increased due to the blocking of the motor, and the controller cuts off the driving output due to the fact that the larger current on the central line (N line) is collected, so that the switch machine stops rotating, but no rechecking is performed on the driving output of the switch machine at present, so that whether the driving output is normally output cannot be determined, and the working state of the circuit cannot be monitored on line, so that the controller can be led to a dangerous side due to the adhesion fault of a device.
Disclosure of Invention
In order to solve the defects and shortcomings in the prior art, the invention provides a detection circuit for controlling a switch machine, which is used for detecting output driving signals back through a controller so as to judge whether a signal system has output faults and ensure safe output.
In order to achieve the technical purpose, the invention provides a detection circuit for controlling a switch machine, wherein the detection circuit is provided with a controller, the controller is provided with a first driving end, a second driving end, a first detection end, a second detection end, a first recovery end and a second recovery end, and the controller comprises:
the three-phase four-wire power supply comprises a direction switching module, a first stoping circuit and a second stoping circuit, wherein the input end of the direction switching module is connected with the first driving end and the second driving end, the output end of the direction switching module is connected with the first stoping circuit and the second stoping circuit, the L2 and L3 wire ends of the three-phase four-wire power supply are connected with the power supply end of the switch machine through the direction switching module, and the L1 and N wire ends of the three-phase four-wire power supply are connected with the power supply end of the switch machine;
the input end of the first stoping circuit is connected with a first detection end, the output end of the first stoping circuit is connected with a switch machine and a first stoping end, the input end of the second stoping circuit is connected with a second detection end, and the output end of the second stoping circuit is connected with the switch machine and a second stoping end.
Optionally, the first driving end includes a first driving end a, a first driving end B, the second driving end includes a second driving end a, a second driving end B, and the controller further includes a third recovery end and a thyristor.
Optionally, the first stoping circuit includes:
relay RLY1, and relay RLY2 connected in series with relay RLY 1;
the coil both ends of relay RLY1 are connected first drive end A and B respectively, relay RLY1 series connection relay RLY2, relay RLY1 are equipped with normally closed contact K1, relay RLY2 is equipped with normally closed contact K2, and first detection end often closes contact K1, normally closed contact K2 and connects first recovery end.
Optionally, the second stoping circuit includes:
a normally-closed optical coupler U10 is arranged between the second driving end A and the second driving end B, the first end of the normally-closed optical coupler U10 is connected with the second driving end A through a resistor R51, the first end of the normally-closed optical coupler U10 is connected with the second driving end B through a resistor R49, the second end of the normally-closed optical coupler U10 is connected with the second driving end B, the third end of the normally-closed optical coupler U10 is connected with a fourth recovery end, and the fourth end of the normally-closed optical coupler U10 is connected with a second detection end.
Optionally, the detection circuit further includes:
a self-locking circuit for inputting a driving signal DO2 to the thyristor is arranged between the second driving end A and the second driving end B, a cutting-off circuit for cutting off the driving self-locking circuit due to the fact that a large current is collected on the N line is arranged at the input end of the self-locking circuit, the output end of the self-locking circuit is connected with the thyristor, and a three-phase four-wire system power supply is connected to the input end of the cutting-off circuit.
Optionally, the cut-off circuit includes:
the device comprises an abnormal current detection circuit, a transformer connected to the output end of the abnormal current detection circuit, a rectifier connected to the output end of the transformer and a triode Q1 connected to the output end of the rectifier, wherein the input end of the abnormal current detection circuit is connected with a three-phase four-wire power supply, the output end of the abnormal current detection circuit is connected to the input end of the transformer, the output end of the transformer is connected to the input end of the rectifier, the output end of the rectifier is connected to the base electrode of the triode Q1, the collector electrode of the triode Q1 is connected to the input end of the self-locking circuit, and the emitter electrode of the triode Q1 is grounded.
Optionally, the self-locking circuit includes:
normally-closed optical coupler U1 and normally-open optical coupler U2 that normally-closed optical coupler U1 links to each other, power supply end VCC is connected to normally-closed optical coupler U1's first end, triode Q1's collecting electrode is connected to normally-closed optical coupler U1's second end, normally-closed optical coupler U1's fifth end links to each other with normally-closed optical coupler U1's fourth end, normally-closed optical coupler U1's fifth end connects normally-open optical coupler U2's first end, normally-closed optical coupler U1's fifth end connects the control end of thyristor, normally-open optical coupler U2's first end, second end connects second drive end B, normally-open optical coupler U2's third end connects normally-closed optical coupler U1's sixth end, normally-open optical coupler U2's fourth end connects the second drive end A of controller.
Optionally, delay circuits for avoiding the cut-off circuit from cutting off the self-locking circuit due to erroneous judgment are arranged on the second driving end A and the second driving end B.
Optionally, the delay circuit includes:
triode Q3, and the normal close opto-coupler U5 that links to each other with triode Q3, second drive end A, second drive end B are connected respectively to triode Q3's base, be equipped with RC circuit between triode Q3's base and projecting pole, normal close opto-coupler U5's first end is connected triode Q3's base, normal close opto-coupler U5's second end is connected triode Q3's collecting electrode, normal close opto-coupler U5's fifth end links to each other with normal close opto-coupler U5's fourth end, sixth end, normal close opto-coupler U5's fifth end is connected self-locking circuit.
Optionally, the RC circuit includes one or more resistors connected in series with a capacitor, or includes one or more resistors connected in parallel with a capacitor, or one or more resistors connected in series with a capacitor.
The technical scheme provided by the invention has the beneficial effects that: the controller is used for respectively carrying out rechecking on the driving signals output by the first driving end and the second driving end, and whether corresponding stoping signals are acquired according to the first stoping end and the second stoping end or not is judged, so that whether a signal system has an output fault or not can be judged, and the output safety is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a detection circuit for controlling forward rotation of a switch machine according to the present invention;
FIG. 2 is a schematic diagram of a detection circuit for controlling the reverse rotation of a switch machine according to the present invention;
FIG. 3 is a phase relationship between a reference signal PHR and a detection signal PH1 according to the present invention;
FIG. 4 is a phase relationship between the reference signal PHR and the detection signal PH2 according to the present invention;
fig. 5 is a first extraction circuit diagram of the driving signal DO1 provided by the present invention;
fig. 6 is a second extraction circuit diagram of the driving signal DO2 provided by the present invention;
fig. 7 is a self-locking circuit diagram of the driving signal DO2 provided by the present invention;
fig. 8 is a delay circuit diagram of the driving signal DO2 provided by the present invention.
Detailed Description
In order to make the structure and advantages of the present invention more apparent, the structure of the present invention will be further described with reference to the accompanying drawings.
Example 1
The embodiment of the invention provides a detection circuit for controlling a switch machine, wherein the detection circuit is provided with a controller, the controller is provided with a first driving end, a second driving end, a first detection end, a second detection end, a first recovery end and a second recovery end, and the controller comprises:
the three-phase four-wire power supply comprises a direction switching module, a first stoping circuit and a second stoping circuit, wherein the input end of the direction switching module is connected with the first driving end and the second driving end, the output end of the direction switching module is connected with the first stoping circuit and the second stoping circuit, the L2 and L3 wire ends of the three-phase four-wire power supply are connected with the power supply end of the switch machine through the direction switching module, and the L1 and N wire ends of the three-phase four-wire power supply are connected with the power supply end of the switch machine;
the input end of the first stoping circuit is connected with a first detection end, the output end of the first stoping circuit is connected with a switch machine and a first stoping end, the input end of the second stoping circuit is connected with a second detection end, and the output end of the second stoping circuit is connected with the switch machine and a second stoping end.
In implementation, a controller is arranged on the detection circuit, the controller comprises a direction switching module and a stoping circuit, wherein the power supply end of the switch machine comprises a first power supply end, a second power supply end, a third power supply end and a fourth power supply end, the L1 and N wire ends of the three-phase four-wire system power supply are respectively connected with the first power supply end and the fourth power supply end of the switch machine, when the switch machine is in a forward rotation state, the L2 and L3 wire ends of the three-phase four-wire system power supply are respectively connected with the second power supply end and the third power supply end of the switch machine through the direction switching module, and when the switch machine is in a reverse rotation state, the L2 and L3 wire ends of the three-phase four-wire system power supply are respectively connected with the third power supply end and the second power supply end of the switch machine through the direction switching module.
When the driving signal DO1 is input into the direction switching module earlier than the driving signal DO2 or the driving signals DO1 and DO2 are input into the direction switching module at the same time, the ends of the three-phase four-wire system L2 and L3 are connected with the second power supply end and the third power supply end of the switch machine through the direction switching module, so that the switch machine is in forward rotation; when the driving signal DO2 is input into the direction switching module earlier than the driving signal DO1, the direction switching module switches the order in which the L2 and L3 wire ends of the three-phase four-wire power supply are connected to the switch machine, so that the L2 and L3 wire ends of the three-phase four-wire power supply are connected to the third power supply end and the second power supply end of the switch machine through the direction switching module, and the switch machine is reversed. The direction switching module realizes the phase sequence switching of L2/L3 according to the sequential input of the driving signals DO1 and DO2, thereby realizing the forward rotation or the reverse rotation of the switch machine.
When the outputs of the driving signals DO1 and DO2 are valid, the controller internal circuit detects the extraction signals DI3 and DI4 of the driving signals DO1 and DO2, so as to determine that the switch machine is in a rotating state, wherein the specific steps of detecting the extraction signal DI3 of the driving signal DO1 and the extraction signal DI4 of the driving signal DO2 by the controller internal circuit are described in detail below, and are not repeated here.
As shown in fig. 1, when the forward rotation of the switch machine is completed, the first detection end sends a detection signal PH1 to the switch machine through the first extraction circuit, the second detection end sends a detection signal PH2 to the switch machine through the second extraction circuit, and at the same time, the first extraction end extracts the detection signal PH1 through the first extraction circuit and transmits an extracted detection signal DI1 to the controller, and the second extraction end extracts the detection signal PH2 through the second extraction circuit and transmits the extracted extraction signal DI2 to the controller.
As shown in fig. 2, when the switch machine is reversed, the first detection end sends a detection signal PH1 to the switch machine through the first extraction circuit, the second detection end sends a detection signal PH2 to the switch machine through the second extraction circuit, and at the same time, the first extraction end extracts the detection signal PH2 through the first extraction circuit and transmits the extracted detection signal DI2 to the controller, and the second extraction end extracts the detection signal PH1 through the second extraction circuit and transmits the extracted extraction signal DI1 to the controller. Therefore, the controller determines the position of the switch machine according to the types of the stoping signals collected by the first stoping end and the second stoping end.
When the output of the driving signals DO1 and DO2 is effective, the switch machine is in a rotating state, the controller does not collect corresponding stoping signals through the first stoping end and the second stoping end, the signal system is in a normal state, otherwise, the controller collects corresponding stoping signals through one of the stoping ends or collects corresponding stoping signals through the two stoping ends, the signal system is in a fault state, and the signal system is guided to the safety side.
When the driving signals DO1 and DO2 are not output, the switch machine is in a stop state, the controller respectively collects corresponding stoping signals through the first stoping end and the second stoping end, the switch machine is in a normal state, and the controller can determine the position of the switch machine according to the collected two stoping signal types. Otherwise, when two recovery ends on the controller do not collect corresponding recovery signals or collect other signals, the signal system is in a fault state, and the signal system is led to the safety side.
In addition, because the external circuit is interfered or the fault leads to the inaccurate stoping signal, and then leads to the inaccurate position detection, even probably because the point switch rotates not in place and makes the track be in dangerous state, therefore the controller only gathers the frequency and the phase place of stoping signal just can confirm to detect effectively, once the stoping signal that the controller gathered is inaccurate, can all make signal system direction safe side. As shown in fig. 3, the frequency of the detection signal PH1 is set to 15Hz, the duty ratio is set to 25% of the pulse signal, and the pulse signal is distinguished by comparing the pulse signal with the reference signal PHR having the same frequency as 15Hz and the duty ratio of 50%, and the processor performs shift sampling with the falling edge of the PHR signal as a synchronous sampling point and with the 8-frequency of PHR frequency.
As shown in fig. 4, the frequency of the detection signal PH2 is set to 15Hz, the duty ratio is set to a pulse signal with 25%, wherein the phase difference between the detection signals PH1 and PH2 is 180 °, the detection signals are distinguished by comparing with a reference signal PHR with the frequency of 15Hz and the duty ratio of 50%, and the processor shifts and samples with the falling edge of the PHR signal as a synchronous sampling point and with the frequency of 8 times of PHR frequency.
The PH1 signal is represented when 0x60 is taken and the PH2 signal is represented when 0x06 is taken. The PH1/PH2 is adopted as the detection signal, so that the safety level is higher than that of the common high-low level, and the safety of a signal system is further improved.
Optionally, the first driving end includes a first driving end a, a first driving end B, the second driving end includes a second driving end a, a second driving end B, and the controller further includes a third recovery end and a thyristor.
In implementation, for convenience of description, the first extraction circuit is mentioned later, so the first driving end is divided into a first driving end a and a first driving end B, and the first driving end a and the first driving end B are respectively the positive end and the negative end of the first driving end.
For convenience of description, the second extraction circuit is mentioned later, so the second driving end is divided into a second driving end A and a second driving end B, and the second driving end A and the second driving end B are respectively positive and negative ends of the second driving end.
Wherein, in order to lead out the second extraction circuit below to the third extraction terminal and the self-locking circuit to the thyristor, the controller also comprises the third extraction terminal and the thyristor.
Optionally, the first stoping circuit includes:
relay RLY1, and relay RLY2 connected in series with relay RLY 1;
the coil both ends of relay RLY1 are connected first drive end A and B respectively, relay RLY1 series connection relay RLY2, relay RLY1 are equipped with normally closed contact K1, relay RLY2 is equipped with normally closed contact K2, and first detection end often closes contact K1, normally closed contact K2 and connects first recovery end.
In implementation, as shown in fig. 5, in the circuit, a-DO1 and B-DO1 refer to driving signals DO1 output from the first driving end a and the first driving end B, respectively, and the first stoping circuit is implemented by connecting a normally-closed contact K1 and a normally-closed contact K2. When the output driving signal DO1 is effective, the relays RLY1 and RLY2 are electrified, the normally closed contacts K1 and K2 are disconnected, and the detection signal PH2 output by the first detection end cannot be transmitted to the controller through the third extraction end; when the driving signal DO1 is not output, the relays RLY1 and RLY2 are powered off, the normally closed contacts K1 and K2 are closed to form a first stoping circuit, the third stoping end carries out stoping on the detection signal PH2, and the collected stoping signal DI3 is transmitted to the controller through the third stoping end.
Therefore, the controller extracts the detection signal PH2 via the relays rli 1 and rli 2, and determines the output state of the driving signal DO1 according to whether or not the extraction signal DI3 is collected at the first extraction end.
Optionally, the second stoping circuit includes:
a normally-closed optical coupler U10 is arranged between the second driving end A and the second driving end B, the first end of the normally-closed optical coupler U10 is connected with the second driving end A through a resistor R51, the first end of the normally-closed optical coupler U10 is connected with the second driving end B through a resistor R49, the second end of the normally-closed optical coupler U10 is connected with the second driving end B, the third end of the normally-closed optical coupler U10 is connected with a fourth recovery end, and the fourth end of the normally-closed optical coupler U10 is connected with a second detection end.
In implementation, as shown in fig. 6, in the circuit, a-DO2 and B-DO2 refer to driving signals DO2 output from the second driving end a and the second driving end respectively, when the driving signals DO2 are not output, the first end and the second end of the normally-closed optocoupler U10 are not powered on, and the third end and the fourth end are conducted, so that the controller sends a detection signal PH2 to the normally-closed optocoupler U10 through the second detection end, and then the fourth extraction end extracts the detection signal PH2 and acquires an extraction signal DI4. When the output driving signal DO2 is effective, the first end and the second end of the normally closed optocoupler U10 are powered on, so that the third end and the fourth end are not conductive, the controller performs stoping on the detection signal PH2 through the detection signal PH2 output by the second detection end and the fourth stoping end, but does not collect the stoping signal DI4.
Therefore, the controller performs stoping on the detection signal PH2 through the normally closed optocoupler U10, and determines the output state of the driving signal DO2 according to whether the stoping signal DI4 is acquired.
The embodiment of the invention provides a detection circuit for controlling a switch machine, wherein the detection circuit is provided with a controller, the controller is provided with a first driving end, a second driving end, a first detection end, a second detection end, a first stoping end and a second stoping end, the controller comprises a direction switching module, a first stoping circuit and a second stoping circuit, the input end of the direction switching module is connected with the first driving end and the second driving end, the output end of the direction switching module is connected with the first stoping circuit and the second stoping circuit, the input end of the first stoping circuit is connected with the first detection end, and the output end of the direction switching module is connected with the switch machine and the first stoping end. The controller is used for respectively carrying out rechecking on the driving signals output by the first driving end and the second driving end, and whether corresponding stoping signals are acquired according to the first stoping end and the second stoping end or not is judged, so that whether a signal system has an output fault or not can be judged, and the output safety is ensured.
Example two
The present embodiment proposes from another aspect a detection circuit for controlling a switch machine, said detection circuit further comprising:
a self-locking circuit for inputting a driving signal DO2 to the thyristor is arranged between the second driving end A and the second driving end B, a cutting-off circuit for cutting off the driving self-locking circuit due to the fact that a large current is collected on the N line is arranged at the input end of the self-locking circuit, the output end of the self-locking circuit is connected with the thyristor, and a three-phase four-wire system power supply is connected to the input end of the cutting-off circuit.
In the implementation, when the controller transmits the driving signal DO2 to the self-locking circuit through the second driving end a and the second driving end B, and the self-locking circuit outputs the driving signal DO2 to the thyristor, the self-locking circuit keeps continuously outputting the driving signal DO2 to the thyristor. The thyristor rotates the switch machine according to the received driving signal DO 2. When the switch machine rotates in place, the cut-off circuit collects larger current on the central line (N line) of the three-phase four-wire system power supply, so that the self-locking circuit is cut off, and the self-locking circuit stops sending the driving signal DO2 to the thyristor, so that the switch machine stops rotating. The self-locking circuit is cut off by the cutting circuit according to the larger current collected on the central line (N line), so that the switch machine stops rotating. The time consumption is shorter and the response is faster than the time consumption for stopping the switch machine by the software processing.
Optionally, the cut-off circuit includes:
the device comprises an abnormal current detection circuit, a transformer connected to the output end of the abnormal current detection circuit, a rectifier connected to the output end of the transformer and a triode Q1 connected to the output end of the rectifier, wherein the input end of the abnormal current detection circuit is connected with a three-phase four-wire power supply, the output end of the abnormal current detection circuit is connected to the input end of the transformer, the output end of the transformer is connected to the input end of the rectifier, the output end of the rectifier is connected to the base electrode of the triode Q1, the collector electrode of the triode Q1 is connected to the input end of the self-locking circuit, and the emitter electrode of the triode Q1 is grounded.
In practice, the cut-off circuit includes an abnormal current detection circuit, a transformer, a rectifier, and a transistor Q1, wherein the transistor Q1 is used as a switch. When the abnormal current detection circuit collects current on the N line, the current on the N line is converted into alternating voltage through the transformer, the alternating voltage is integrated into direct voltage through the rectifier and is finally transmitted to the triode Q1, so that the rectifier outputs larger direct voltage, when the direct voltage is increased to a certain value, the triode Q1 is saturated and conducted, the self-locking circuit is cut off, and therefore the self-locking circuit stops outputting driving signals, and the switch machine stops rotating.
Optionally, the self-locking circuit includes:
normally-closed optical coupler U1 and normally-open optical coupler U2 that normally-closed optical coupler U1 links to each other, power supply end VCC is connected to normally-closed optical coupler U1's first end, triode Q1's collecting electrode is connected to normally-closed optical coupler U1's second end, normally-closed optical coupler U1's fifth end links to each other with normally-closed optical coupler U1's fourth end, normally-closed optical coupler U1's fifth end connects normally-open optical coupler U2's first end, normally-closed optical coupler U1's fifth end connects the control end of thyristor, normally-open optical coupler U2's first end, second end connects second drive end B, normally-open optical coupler U2's third end connects normally-closed optical coupler U1's sixth end, normally-open optical coupler U2's fourth end connects the second drive end A of controller.
In implementation, as shown in fig. 7, the self-locking circuit includes a normally-closed optocoupler U1 and a normally-open optocoupler U2, when the triode Q1 is not turned on, the first end and the second end of the normally-closed optocoupler U1 have no driving voltage, and the fourth end, the fifth end and the sixth end of the normally-closed optocoupler U1 are turned on, the controller transmits the driving signal DO2 to the normally-closed optocoupler U1 through the second driving end a, and the normally-closed optocoupler U1 transmits the driving signal DO2 to the first end of the normally-open optocoupler U2 through the fourth end, the fifth end and the sixth end thereof, so that the normally-open optocoupler U2 is powered on, and the driving signal DO2 is transmitted back to the fourth end, the fifth end and the sixth end of the normally-closed optocoupler U1.
The embodiment of the invention provides a detection circuit for controlling a switch machine, which further comprises:
a self-locking circuit for inputting a driving signal DO2 to the thyristor is arranged between the second driving end A and the second driving end B, a cutting-off circuit for cutting off the driving self-locking circuit due to the fact that a large current is collected on the N line is arranged at the input end of the self-locking circuit, the output end of the self-locking circuit is connected with the thyristor, and a three-phase four-wire system power supply is connected to the input end of the cutting-off circuit. The self-locking circuit is cut off when the cutting circuit collects larger current on the N line of the three-phase four-wire system power supply, so that the self-locking circuit stops outputting driving signals, and the switch machine stops rotating.
Example III
The embodiment also provides a detection circuit for controlling the switch machine, and delay circuits for preventing the cut-off circuit from cutting off the self-locking circuit due to misjudgment are arranged on the second driving end A and the second driving end B.
In implementation, the situation that the starting current is unstable may exist when the switch machine starts to rotate, so that the cut-off circuit may collect a larger current in a short time, and the cut-off circuit is caused to malfunction to cut off the self-locking circuit, so that the self-locking circuit stops driving, and the switch machine fails to start. Therefore, the second driving end A and the second driving end B are provided with delay circuits.
The driving signal DO2 is transmitted to the thyristor to control the switch machine to rotate through the delay circuit, the delay circuit finishes outputting the driving signal DO2 until the current of the switch machine is stable, and then the self-locking circuit continues outputting the driving signal DO2 until the switch machine is in place, the cutting circuit collects a large current on the central line (N line) of the three-phase four-wire power supply, and then the self-locking circuit is cut off, so that the switch machine stops rotating.
Optionally, the delay circuit includes:
triode Q3, and the normal close opto-coupler U5 that links to each other with triode Q3, second drive end A, second drive end B are connected respectively to triode Q3's base, be equipped with RC circuit between triode Q3's base and projecting pole, normal close opto-coupler U5's first end is connected triode Q3's base, normal close opto-coupler U5's second end is connected triode Q3's collecting electrode, normal close opto-coupler U5's fifth end links to each other with normal close opto-coupler U5's fourth end, sixth end, normal close opto-coupler U5's fifth end is connected self-locking circuit.
In implementation, as shown in fig. 8, in the circuit, a-DO2 and B-DO2 refer to the driving signals DO2 output from the second driving end a and the second driving end B, the resistors R23 and R31 and the capacitor C13 form an RC circuit, when the driving signals DO2 are transmitted to the triode Q3 through the second driving end a and the second driving end B, and the charging of the RC circuit is not completed, the triode Q3 is not conducted, the first end and the second end of the normally closed optocoupler U5 have no conducting voltage, the fourth end, the fifth end and the sixth end of the normally closed optocoupler U5 have conducting voltages, and the driving signal DO2 is always output to the thyristor to control the switch machine to rotate.
When the RC circuit is charged, the triode Q3 is saturated and is conducted, the first end and the second end of the normally-closed optical coupler U5 are conducted with voltage, the fourth end, the fifth end and the sixth end of the normally-closed optical coupler U5 are disconnected, the driving signal DO2 is output to the self-locking circuit, and then the self-locking circuit is used for controlling the rotation of the switch machine. The delay time of the delay circuit can be set to 400 ms-1000 ms according to RC parameters.
Optionally, the RC circuit includes one or more resistors connected in series with a capacitor, or includes one or more resistors connected in parallel with a capacitor, or one or more resistors connected in series with a capacitor.
In practice, when the RC circuit is formed by one or more resistors in series with a capacitor, both the resistor and the capacitor have a blocking effect on the current due to the presence of the capacitor, which is not capable of flowing a direct current. The total impedance is determined by the resistance and capacitance, and varies with frequency.
When the RC circuit is formed by connecting one or more resistors in parallel with a capacitor, the parallel circuit can pass through both direct current and alternating current signals.
When the RC circuit is formed by connecting one or more resistors in series and parallel with a capacitor, the RC circuit has two turning frequencies, and analysis is needed according to a specific circuit.
In the charging and discharging process of the RC circuit, the voltage on the capacitor varies exponentially with time, the variation speed depends on a time constant T, t=rc, and when the voltage is in a fixed state, the larger the capacitor C, the longer the charging and discharging time, or when the resistor R is larger, the smaller the charging and discharging current, the longer the charging and discharging time.
The embodiment of the invention provides a detection circuit for controlling a switch machine, wherein delay circuits for preventing a cut-off circuit from cutting off a self-locking circuit due to misjudgment are arranged on a second driving end A and a second driving end B. Through being equipped with delay circuit on second drive end A, second drive end B, avoided having the unstable condition of starting current when the point switch just begins to rotate for the circuit that cuts off can gather great current in the short time, leads to cutting off the circuit malfunction and cuts off self-locking circuit, and then makes the point switch start failure.
The various numbers in the above embodiments are for illustration only and do not represent the order of assembly or use of the various components.
The foregoing is illustrative of the present invention and is not to be construed as limiting thereof, but rather, the present invention is to be construed as limited to the appended claims.
Claims (7)
1. A detection circuit for controlling switch machine is equipped with the controller on detection circuit, and the controller is equipped with first drive end, second drive end, first detection end, second detection end, first recovery end and second recovery end, its characterized in that, the controller includes:
the three-phase four-wire power supply comprises a direction switching module, a first stoping circuit and a second stoping circuit, wherein the input end of the direction switching module is connected with the first driving end and the second driving end, the output end of the direction switching module is connected with the first stoping circuit and the second stoping circuit, the L2 and L3 wire ends of the three-phase four-wire power supply are connected with the power supply end of the switch machine through the direction switching module, and the L1 and N wire ends of the three-phase four-wire power supply are connected with the power supply end of the switch machine;
the input end of the first stoping circuit is connected with a first detection end, the output end of the first stoping circuit is connected with a switch machine and the first stoping end, the input end of the second stoping circuit is connected with a second detection end, and the output end of the second stoping circuit is connected with the switch machine and the second stoping end;
the first driving end comprises a first driving end A and a first driving end B, the second driving end comprises a second driving end A and a second driving end B, and the controller also comprises a third recovery end and a thyristor; the third extraction end is connected with a normally closed contact K1 of the relay RLY1, extracts the detection signal and transmits the extracted signal to the controller through the third extraction end; the thyristor is used for receiving the output signal of the self-locking circuit and controlling the starting and stopping of the switch machine;
the first stoping circuit includes:
relay RLY1, and relay RLY2 connected in series with relay RLY 1;
the two ends of a coil of the relay RLY1 are respectively connected with the first driving ends A and B, the relay RLY1 is connected with the relay RLY2 in series, the relay RLY1 is provided with a normally closed contact K1, the relay RLY2 is provided with a normally closed contact K2, and the first detection end is connected with the first recovery end through the normally closed contact K1 and the normally closed contact K2;
the second stoping circuit includes:
and a normally closed optical coupler U10 is arranged between the second driving end A and the second driving end B, the first end of the normally closed optical coupler U10 is connected with the second driving end A through a resistor R51, the first end of the normally closed optical coupler U10 is connected with the second driving end B through a resistor R49, the second end of the normally closed optical coupler U10 is connected with the second driving end B, the third end of the normally closed optical coupler U10 is connected with a fourth recovery end, the fourth recovery end returns a recovery signal to the controller, and the fourth end of the normally closed optical coupler U10 is connected with the second detection end.
2. The detection circuit for controlling a switch machine according to claim 1, wherein the detection circuit further comprises:
a self-locking circuit for inputting a driving signal DO2 to the thyristor is arranged between the second driving end A and the second driving end B, a cutting-off circuit for cutting off the driving self-locking circuit due to the fact that a large current is collected on the N line is arranged at the input end of the self-locking circuit, the output end of the self-locking circuit is connected with the thyristor, and a three-phase four-wire system power supply is connected to the input end of the cutting-off circuit.
3. The detection circuit for controlling a switch machine according to claim 2, wherein the cutoff circuit comprises:
the device comprises an abnormal current detection circuit, a transformer connected to the output end of the abnormal current detection circuit, a rectifier connected to the output end of the transformer and a triode Q1 connected to the output end of the rectifier, wherein the input end of the abnormal current detection circuit is connected with a three-phase four-wire power supply, the output end of the abnormal current detection circuit is connected to the input end of the transformer, the output end of the transformer is connected to the input end of the rectifier, the output end of the rectifier is connected to the base electrode of the triode Q1, the collector electrode of the triode Q1 is connected to the input end of the self-locking circuit, and the emitter electrode of the triode Q1 is grounded.
4. The detection circuit for controlling a switch machine according to claim 2, wherein the self-locking circuit comprises:
normally-closed optical coupler U1 and normally-open optical coupler U2 that normally-closed optical coupler U1 links to each other, power supply end VCC is connected to normally-closed optical coupler U1's first end, triode Q1's collecting electrode is connected to normally-closed optical coupler U1's second end, normally-closed optical coupler U1's fifth end links to each other with normally-closed optical coupler U1's fourth end, normally-closed optical coupler U1's fifth end connects normally-open optical coupler U2's first end, normally-closed optical coupler U1's fifth end connects the control end of thyristor, normally-open optical coupler U2's first end, second end connects second drive end B, normally-open optical coupler U2's third end connects normally-closed optical coupler U1's sixth end, normally-open optical coupler U2's fourth end connects the second drive end A of controller.
5. The detecting circuit for controlling a switch machine according to claim 2, wherein a delay circuit for preventing the cut-off circuit from cutting off the self-locking circuit due to erroneous judgment is provided on the second driving end a, the second driving end B.
6. The detection circuit for controlling a switch machine according to claim 5, wherein the delay circuit comprises:
triode Q3, and the normal close opto-coupler U5 that links to each other with triode Q3, second drive end A, second drive end B are connected respectively to triode Q3's base, be equipped with RC circuit between triode Q3's base and projecting pole, normal close opto-coupler U5's first end is connected triode Q3's base, normal close opto-coupler U5's second end is connected triode Q3's collecting electrode, normal close opto-coupler U5's fifth end links to each other with normal close opto-coupler U5's fourth end, sixth end, normal close opto-coupler U5's fifth end is connected self-locking circuit.
7. The detection circuit for controlling a switch machine according to claim 6, wherein the RC circuit comprises one or more resistors in series with one capacitor, or one or more resistors in parallel with one capacitor, or a plurality of resistors in series with one capacitor.
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| CN109004624B (en) * | 2018-09-14 | 2023-07-14 | 北京安润通电子技术开发有限公司 | Open-phase detection module of three-phase turnout point machine and application method thereof |
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