An electronic flasher for controlling the yellow flashing light of railway signals

Abstract

An electronic flasher for controlling yellow flashing and yellow lighting in railway signals includes a power supply unit and a microcontroller, a flash control signal detection unit, a flash check output unit, a lighting control output unit, and a feedback detection unit. The microcontroller is connected to each working unit via corresponding ports. The lighting control output unit and the feedback detection unit, together with the microcontroller, form a control module that switches an external lighting control circuit on or off. The control module can be either a standard control module (the lighting control output unit includes one lighting control output circuit and the feedback detection unit includes one feedback detection circuit) or a redundant control module (the lighting control output unit includes two identical lighting control output circuits and the feedback detection unit includes two identical feedback detection circuits). This electronic flasher has a simple structure, precise control, long life, and is safe and reliable. It meets the requirements of the fault-oriented safety principle of railway signal control, which prohibits output when the device fails.

Description

Technical Field

[0001] The present invention relates to a railway signal device, in particular to an electronic flasher used for controlling yellow flashing and yellow lighting in railway signals. Background Art

[0002] In railway signal control, to indicate the speed of a train passing through a siding of turnouts #18 and above, the signal in front of it uses a "yellow light + flashing yellow light" (yellow-flashing-yellow) display mode. In the prior art, the "flashing yellow light" is controlled by using a resistor-capacitor device, a safety relay (JWXC-1700), and its contacts to form a pulsating flashing relay circuit. The circuit operates by continuously charging and discharging the capacitor to provide a periodic pulsating control signal to the safety relay. This safety relay is in a pulsating operating state, controlling the on and off of the lighting current through its contacts, thereby achieving the purpose of the "flashing yellow light."

[0003] The above-mentioned pulsating flash relay circuit has the following deficiencies in use:

[0004] (1) The pulsation frequency of the flash relay is determined by the capacitance and the related resistance. When the capacitor works for a long time, the capacitance will decrease or even fail, which will cause the pulsation frequency of the flash relay to change, or even completely lose the flashing function, affecting driving safety and reducing driving efficiency.

[0005] (2) The safety relay (model JWXC-1700) used to drive the signal lights is an electromagnetic electromechanical composite relay widely used in railway signal control. Due to structural limitations and the contact exposed to the air, its mechanical life and electrical life cannot support its long-term pulsating operation. When the flasher is in a pulsating working state, after 2-3 years of use, the reed of the safety relay loses its elasticity and the contact wears out seriously, causing abnormal on-off of the lighting circuit, resulting in abnormal indication of the signal light and affecting driving safety. In order to ensure the reliability of the signal indication, signal maintenance personnel must regularly replace the resistor and capacitor components and safety relays, which increases both workload and investment costs. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide an electronic flasher for controlling yellow flashing and yellow lighting of railway signals with high reliability and long service life, so as to overcome the above-mentioned shortcomings of the prior art.

[0007] To solve the above technical problems, the present invention adopts the following technical solution: an electronic flasher for controlling yellow flashing and yellow lighting of railway signals, comprising a power supply unit for providing a 24V DC regulated working power supply to the electronic flasher, each working unit of the electronic flasher comprising a microcontroller, a flash control signal detection unit, a flash check output unit, a lighting control output unit, and a feedback detection unit, wherein the microcontroller is connected to each working unit of the electronic flasher via corresponding ports:

[0008] A flash control signal detection unit for receiving an external flash control signal is connected to a receiving port of a microcontroller; an input end of a flash check output unit for controlling the working state of a flash check relay of an external lighting control circuit is connected to an output port of the microcontroller, and an output end of the flash check output unit is connected to a flash check relay circuit of the external lighting control circuit; an input end of a lighting control output unit for outputting a lighting control signal is connected to a control port of the microcontroller, and an output end is connected to the external lighting control circuit; a feedback end of a feedback detection unit for obtaining the operating state of the external lighting control circuit is connected to an input port of the microcontroller, and a sampling end of the feedback detection unit is connected to the external lighting control circuit via a sampling wire segment;

[0009] The flash check output unit includes a dynamic drive circuit III and a flash check control relay. The coil of the flash check control relay is connected to an output port of the microcontroller via the dynamic drive circuit III. The contact switch of the flash check control relay is connected in series between the coil of the flash check relay of the external lighting control circuit and the power supply. The lighting control output unit includes a lighting control output circuit, which includes a dynamic drive circuit and a lighting control relay. The feedback detection unit includes a feedback detection circuit, which includes a current transformer, a rectifier and filter circuit, and a signal conditioning circuit.

[0010] The lighting control output unit and the feedback detection unit and the microcontroller constitute a control module that switches on or off the external lighting control circuit; the control module may be a standard control module or a redundant control module;

[0011] When the control module is a standard control module, the lighting control output unit includes a lighting control output circuit, and the feedback detection unit includes a feedback detection circuit;

[0012] The lighting control output circuit includes a dynamic drive circuit and a lighting control relay, the coil of the lighting control relay is connected to the control port of the microcontroller through the dynamic drive circuit, and the contact switch of the lighting control relay is connected in series between the two end points of the sampling wire segment; the feedback detection circuit includes a current transformer, a rectifier and filter circuit, and a signal conditioning circuit, the primary side of the current transformer of the feedback detection circuit is coupled to the sampling wire segment, and the sampling wire segment is directly connected in parallel with the external lighting control circuit, the secondary side of the current transformer is connected to the rectifier and filter circuit and the signal conditioning circuit in sequence, and the output end of the signal conditioning circuit is connected to an input port of the microcontroller;

[0013] When the control module is a redundant control module, it includes two control modules with identical structures: a first control module and a second control module. That is, the lighting control output unit includes two identical lighting control output circuits: lighting control output circuit I and lighting control output circuit II. The feedback detection unit includes two identical feedback detection circuits: feedback detection circuit I and feedback detection circuit II. The lighting control output circuit I and feedback detection circuit I together with the microcontroller constitute the first control module, and the lighting control output circuit II and feedback detection circuit II together with the microcontroller constitute the second control module.

[0014] The lighting control output circuit I includes a dynamic drive circuit I and a lighting control relay I, the coil of the lighting control relay I is connected to the control port of the microcontroller through the dynamic drive circuit I, and the contact switch of the lighting control relay I is connected in series between the C1 end and the D1 end of the first sampling wire segment; the lighting control output circuit II includes a dynamic drive circuit II and a lighting control relay II, the coil of the lighting control relay II is connected to the control port of the microcontroller through the dynamic drive circuit II, and the contact switch of the lighting control relay II is connected in series between the C2 end and the D2 end of the second sampling wire segment;

[0015] The feedback detection circuit I includes a current transformer I, a rectifier and filter circuit I, and a signal conditioning circuit I. The primary side of the current transformer I of the feedback detection circuit I is coupled to the first sampling wire segment, the secondary side of the current transformer I is sequentially connected to the rectifier and filter circuit I and the signal conditioning circuit I, and the output end of the signal conditioning circuit I is connected to an input port of the microcontroller; the feedback detection circuit II includes a current transformer II, a rectifier and filter circuit II, and a signal conditioning circuit II; the primary side of the current transformer II of the feedback detection circuit II is coupled to the second sampling wire segment, the secondary side of the current transformer II is sequentially connected to the rectifier and filter circuit II and the signal conditioning circuit II, and the output end of the signal conditioning circuit II is connected to an input port of the microcontroller;

[0016] The lighting control output circuit I and the lighting control output circuit II as well as the feedback detection circuit I and the feedback detection circuit II are respectively switched and connected to the microcontroller and the external lighting control circuit through a switching circuit; the switching circuit includes a dynamic drive circuit IV and a two-way switching relay, the coil of the two-way switching relay is connected to a control port of the microcontroller through the dynamic drive circuit IV, the common contact of the first group of contact switches of the two-way switching relay is connected to a control port of the microcontroller, and the normal contact and normally open point of the contact switch are respectively connected to the input ends of the dynamic drive circuit I of the lighting control output circuit I and the dynamic drive circuit II of the lighting control output circuit II; the common contact of the second group of contact switches of the two-way switching relay is connected to the external lighting control circuit, and the normal contact and normally open point of the contact switch are respectively connected to the first sampling wire segment and the second sampling wire segment.

[0017] A further technical solution is that the flash check control relay, the dual-way switching relay, the lighting control relay, the lighting control relay I and the lighting control relay II are all reed switch relays;

[0018] The dynamic drive circuit, dynamic drive circuit I, dynamic drive circuit II, dynamic drive circuit III and dynamic drive circuit IV have the same structure, including a first transistor, a second transistor, a third transistor, a fourth transistor, a first electrolytic capacitor and a second electrolytic capacitor, the first transistor, the second transistor and the third transistor are NPN type, and the fourth transistor is PNP type;

[0019] The base of the first transistor is connected to the input signal through the sixth resistor, and its emitter is connected to the negative pole of the power supply. The collector of the first transistor is connected to the base of the second transistor and is connected to the positive pole of the power supply through the fifth resistor and the third resistor.

[0020] The collector of the second transistor is connected to the base of the third transistor and the fourth transistor and connected to the positive electrode of the power supply through the eighth resistor, and its emitter is connected to the negative electrode of the power supply;

[0021] The emitters of the third transistor and the fourth transistor are connected to the positive electrode of the first electrolytic capacitor, the negative electrode of the first electrolytic capacitor is connected to the negative electrode of the power supply through the first diode, and the negative electrode of the first electrolytic capacitor is also connected to the contact 2 of the load through the second diode. The contact 1 of the load is connected to the negative electrode of the power supply, and the load contacts 1 and 2 are connected in parallel to the second electrolytic capacitor.

[0022] Furthermore: the external dimensions and contact pin numbering of the electronic flasher comply with the requirements of the standard "GB / T 7417-2010 Railway Signal AX Series Relay", among which: the lead-out contact 31 is connected to the positive pole of the power supply unit, the contacts 2\4 are connected to the negative pole of the power supply unit, the lead-out contact 13 is connected to the external flash control signal, and the lead-out contacts 51 and 52 are respectively connected to the common point of the second group of contact switches of the dual-way switching relay and the external lighting control circuit.

[0023] Due to the adoption of the above technical solution, the electronic flasher for controlling yellow flashing and yellow lighting of railway signals of the present invention has the following beneficial effects:

[0024] (1) The electronic flasher uses a microcontroller to generate the control signal required for yellow flashing and yellow lighting control, and has stable performance and high reliability;

[0025] This technology overcomes the following shortcomings of traditional pulsating flash relay circuits: "The pulsating frequency of the flash relay is determined by the capacitance and related resistance. After long-term operation, the capacitance of the capacitor will decrease or even fail, causing the pulsating frequency of the flash relay to change, or even completely lose the flashing function, affecting driving safety and reducing driving efficiency."

[0026] (2) The lighting drive relay and flash check control relay of the electronic flasher use reed switch relays as output actuators instead of safety relays, which brings the following beneficial effects:

[0027] 1. Long lifespan

[0028] (1) The contacts of the reed switch relay are made of inert precious metal rhodium, which has a high melting point and can effectively reduce the loss of the contact surface caused by the arc. Compared with the contacts of electromagnetic electromechanical composite relays that generally use silver, nickel, copper and other materials, it has a longer service life;

[0029] (2) The reed switch relay is an electromagnetic relay with sealed contacts. Its switch components are hermetically sealed in an inert gas. Its contacts are sealed and are not contaminated by dust, moisture and harmful gases. The rotor has a small mass and a small stroke. The electrical life of the contacts is long, generally up to about 10 to the power of 7, far exceeding that of electromagnetic electromechanical composite relays.

[0030] (3) The reed switch of the reed switch relay is a wear-free device with no sliding parts, so there will be no metal fatigue. Its mechanical life is much longer than that of the electromagnetic electromechanical composite relay.

[0031] The failure rate is much lower than the 50ppm (50 times per million) failure rate of electromagnetic electromechanical composite relays;

[0032] 2. Reed switch relays have a simple structure, small size, low pull-in power, and generally have a pull-in and release time of within 0.5 to 2 ms. They are highly sensitive and safe and reliable.

[0033] (3) The reed switch relay is driven by a dynamic drive circuit, which has high control accuracy. It can ensure that there is no voltage output due to a front-end circuit failure or a component failure in the drive circuit, meeting the requirements of the fault-oriented safety principle of railway signal control, that is, there can be no output when the equipment fails;

[0034] The dynamic drive circuit, consisting of four transistors, two electrolytic capacitors, and two diodes, can repeatedly charge and discharge the first electrolytic capacitor C3 in response to an external high- and low-level sequence signal (pulse signal), thereby outputting a DC voltage. The circuit only outputs a stable DC voltage to drive the load (relay) when a continuous square wave signal is input to the DT terminal. When the input signal DT is high or low, there is no output and the load cannot be driven. In other words, the relay can only be closed when the microcontroller's output square wave signal, which is converted to a high-level drive signal by the dynamic drive circuit, stops functioning. The relay coil can only be de-energized and released when the microcontroller stops outputting the square wave signal and maintains a high or low output, resulting in the dynamic drive circuit outputting a low-level signal. If the microcontroller fails, it will not output the square wave signal, preventing the relay from closing. This not only complies with the fault-oriented safety principle of railway signal control, but also avoids the safety hazard of using level-driven control, where a fixed high-level signal is still output due to a circuit fault, causing the relay coil to close and the signal light to remain on.

[0035] (4) The control module of the electronic flasher can be a standard control module or a redundant control module. When the control module is a redundant control module, it has two control modules with the same structure: a first control module and a second control module. When working, one control module is used for lighting control by default, and the other control module is used as a standby. When the working control module fails, the external lighting control circuit is switched to the standby control module through a switching circuit to continue working, thereby greatly improving reliability.

[0036] The technical features of an electronic flasher for controlling yellow flashing and yellow lighting of railway signals according to the present invention will be further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a block diagram of the principle of an electronic flasher used for railway signal yellow flashing and yellow light control:

[0038] Figure 2 This is a schematic diagram of the structure of a standard electronic flasher (the control module is a standard control module);

[0039] Figures 3 and 4 This is a schematic diagram of the structure of a redundant electronic flasher (the control module is a redundant control module):

[0040] Figure 3 This is a schematic diagram of connecting the first control module. Figure 4 This is a schematic diagram of connecting the second control module;

[0041] Figures 5 and 6 This is a schematic diagram of the dynamic drive circuit controlling the relay action:

[0042] Figure 5 This is a schematic diagram of the relay closing action caused by inputting a square wave signal.

[0043] Figure 6 Schematic diagram of the relay release action when inputting high level or low level (stop inputting square wave signal);

[0044] Figure 7 This is the circuit diagram of the dynamic drive circuit;

[0045] Figure 8 This is a schematic diagram of the lead-out interface numbering on the back of the electronic flash (13, 2\4, 31, 51 and 52 are some of the lead-out contacts).

[0046] In the picture:

[0047] Ⅰ—Electronic flasher, Ⅱ—External lighting control circuit, SNJJ—Flash check relay;

[0048] 1—power supply unit, 2—microcontroller, 3—flash control signal detection unit, 4—flash check output unit, 401—dynamic drive circuit III, SNJKJ—flash check control relay;

[0049] 5—Lighting control output unit, 50—Lighting control output circuit, 501—Dynamic drive circuit, SNJ—Lighting control relay; 051—Lighting control output circuit I, 511—Dynamic drive circuit I, SNJ I—Lighting control relay I, SNJ1—Contact switch of lighting control relay I; 052—Lighting control output circuit II, 521—Dynamic drive circuit II, SNJ II—Lighting control relay II, SNJ2—Contact switch of lighting control relay II;

[0050] 6—feedback detection unit, 601—current transformer, 602—rectifier and filter circuit, 603—signal conditioning circuit, CD—sampling conductor segment;

[0051] 61—Feedback detection circuit I, 611—Current transformer I, 612—Rectifier and filter circuit I, 613—Signal conditioning circuit I, C1D1—First sampling conductor segment; 62—Feedback detection circuit II, 621—Current transformer II, 622—Rectifier and filter circuit II, 623—Signal conditioning circuit II, C2D2—Second sampling conductor segment;

[0052] 7—switching circuit, 701—dynamic drive circuit IV, QHJ—dual-way switching relay, QHJ1—the first set of contact switches of the dual-way switching relay, QHJ2—the second set of contact switches of the dual-way switching relay. DETAILED DESCRIPTION

[0053] Example 1

[0054] An electronic flasher for railway signal yellow flash yellow light control (also known as a standard electronic flasher, the control module of the electronic flasher is a standard control module, such as Figure 2 As shown), it includes a power supply unit 1 that provides a 24V DC regulated working power supply for the electronic flash. Each working unit of the electronic flash includes a microcontroller 2, a flash control signal detection unit 3, a flash check output unit 4, a lighting control output unit 5, and a feedback detection unit 6. The microcontroller 2 is connected to each working unit of the electronic flash through corresponding ports:

[0055] A flash control signal detection unit 3 for receiving an external flash control signal is connected to a receiving port of the microcontroller; an input end of a flash check output unit 4 for controlling the operating state of a flash check relay SNJJ of an external lighting control circuit is connected to an output port of the microcontroller, and an output end of the flash check output unit 4 is connected to a flash check relay circuit of the external lighting control circuit; an input end of a lighting control output unit 5 for outputting a lighting control signal is connected to a control port of the microcontroller, and an output end is connected to the external lighting control circuit; a feedback detection unit 6 for obtaining the operating state of the external lighting control circuit has a feedback end connected to an input port of the microcontroller, and a sampling end of the feedback detection unit 6 is connected to the external lighting control circuit via a sampling conductor segment CD;

[0056] The flash check output unit 4 includes a dynamic drive circuit III 401 and a flash check control relay SNJKJ. The coil of the flash check control relay SNJKJ is connected to an output port of the microcontroller via the dynamic drive circuit III. The contact switch of the flash check control relay SNJKJ is connected in series between the coil of the flash check relay SNJJ of the external lighting control circuit and the power supply.

[0057] The lighting control output unit 5 includes a lighting control output circuit, which includes a dynamic drive circuit and a lighting control relay. The coil of the lighting control relay is connected to a control port of the microcontroller through the dynamic drive circuit. The contact switch of the lighting control relay is connected in series to the sampling wire segment CD connected in parallel with the external lighting control circuit. When the contact switch of the lighting control relay is closed, the C end of the sampling wire segment is connected to the D end. When the contact switch of the lighting control relay is released, the C end of the sampling wire segment is disconnected from the D end.

[0058] The feedback detection unit 6 includes a feedback detection circuit, which includes a current transformer, a rectifier and filter circuit, and a signal conditioning circuit. The primary side of the current transformer is coupled to the sampling conductor segment CD, and the secondary side of the current transformer is connected to the rectifier and filter circuit and the signal conditioning circuit in sequence. The output of the signal conditioning circuit, i.e., the feedback end of the feedback detection unit, is connected to the input port of the microcontroller.

[0059] The lighting control output unit 5 and the feedback detection unit 6 together with the microcontroller 2 constitute a control module for connecting or disconnecting the external lighting control circuit; the control module is a standard control module; in this case, the lighting control output unit 5 includes a lighting control output circuit 50, and the feedback detection unit includes a feedback detection circuit 60;

[0060] The lighting control output circuit 50 includes a dynamic drive circuit 501 and a lighting control relay SNJ. The coil of the lighting control relay SNJ is connected to the control port of the microcontroller through the dynamic drive circuit. The contact switch of the lighting control relay SNJ is connected in series between the C end and the D end of the sampling wire segment CD.

[0061] The feedback detection circuit 60 includes a current transformer 601, a rectifier and filter circuit 602, and a signal conditioning circuit 603. The primary side of the current transformer of the feedback detection circuit is coupled to a sampling conductor segment CD, which is directly connected in parallel to an external lighting control circuit. The secondary side of the current transformer is connected to the rectifier and filter circuit and the signal conditioning circuit in sequence. The output end of the signal conditioning circuit is connected to an input port of a microcontroller.

[0062] The flash check control relay SNJKJ, dual-way switching relay QHJ, lighting control relay SNJ, lighting control relay ISNJⅠ and lighting control relay IISNJⅡ are all reed switch relays;

[0063] The dynamic drive circuit 501, dynamic drive circuit I 511, dynamic drive circuit II 521, dynamic drive circuit III 401 and dynamic drive circuit IV 701 have the same structure (see attached Figure 7 ), including a first transistor UA1, a second transistor UA2, a third transistor UA3, a fourth transistor UA4, a first electrolytic capacitor C3 and a second electrolytic capacitor C4, the first transistor, the second transistor and the third transistor UA3 are NPN type, and the fourth transistor is PNP type;

[0064] The base of the first transistor UA1 ( Figure 7 The input signal DT is connected to the external resistor R6 through the resistor 6, its emitter is connected to the negative pole of the power supply, and the collector of the first transistor UA1 is connected to the base of the second transistor UA2 ( Figure 7 Point F in the middle) and connected to the positive pole of the power supply through the fifth resistor R5 and the third resistor R3;

[0065] The collector of the second transistor UA2 is connected to the base of the third transistor UA3 and the fourth transistor UA4 ( Figure 7 The G point in the middle) is connected to the positive pole of the power supply through the eighth resistor R8, and its emitter is connected to the negative pole of the power supply;

[0066] The emitters of the third transistor UA3 and the fourth transistor UA4 are connected to the positive electrode of the first electrolytic capacitor C3, the negative electrode of the first electrolytic capacitor C3 is connected to the negative electrode of the power supply through the first diode D1, and the negative electrode of the first electrolytic capacitor C3 is also connected to the contact 2 of the load JDQ through the second diode D2. The contact 1 of the load JDQ is connected to the negative electrode of the power supply, and the contacts 1 and 2 of the load JDQ are connected in parallel to the second electrolytic capacitor C4.

[0067] (1) When the input signal DT is high: the base of the first transistor ( Figure 7 Point E) is high level, the first transistor UA1 is turned on, and the base of the second transistor UA2 ( Figure 7 Point F) is low level, the second transistor UA2 is cut off, the bases of the third transistor UA3 and the fourth transistor UA4 ( Figure 7 At point G in the middle, the third transistor UA3 is turned on, the fourth transistor UA4 is turned off, and the circuit charges the first electrolytic capacitor C3. The charging circuit is: KZ power supply + → ce electrode of the third transistor UA3 → first electrolytic capacitor C3+ → first electrolytic capacitor C3- → first diode D1+ → first diode D1- → KF power supply -;

[0068] At this time, the second electrolytic capacitor C4 discharges to the load JDQ to keep the driving voltage stable.

[0069] (2) When the input signal DT is low: the base of the first transistor (point E in the figure) is low, the first transistor UA1 is cut off, the base of the second transistor UA2 (point F in the figure) is high, the second transistor UA2 is turned on, the bases of the third transistor UA3 and the fourth transistor UA4 (point G in the figure) are low, the third transistor UA3 is cut off, the fourth transistor UA4 is turned on, and the first electrolytic capacitor C3 is discharged through the ec pole of the fourth transistor UA4. The discharge circuit is: the first electrolytic capacitor C3+ → the ec pole of the fourth transistor UA4 → the 1 pole of the load JDQ → the 2 pole of the load JDQ → the second diode D2+ → the second diode D2- → the first electrolytic capacitor C3-);

[0070] At this time, while outputting the driving load JDQ, the first electrolytic capacitor C4 is charged;

[0071] (3) When a continuous square wave signal is input to the DT terminal, the dynamic drive circuit outputs a stable DC voltage to drive the load JDQ.

[0072] The electronic flasher's dimensions and contact pin numbering comply with the requirements of the standard "GB / T 7417-2010 Railway Signal AX Series Relays", where: lead-out contact 31 is connected to the positive pole of the power supply unit, contacts 2 and 4 are connected to the negative pole of the power supply unit, lead-out contact 13 is connected to the external flash control signal, and lead-out contacts 51 and 52 are connected to the common point of the second group of contact switches of the dual-way switching relay QHJ and the external lighting control circuit respectively.

[0073] Example 2

[0074] An electronic flasher for railway signal yellow flash yellow light control (also known as redundant electronic flasher, the control module of the electronic flasher is a redundant control module, such as Figure 3 、 Figure 4 As shown), its composition structure is basically the same as that of the first embodiment, including a power supply unit 1 for providing a 24V DC regulated working power supply for the electronic flasher, and each working unit of the electronic flasher includes a microcontroller 2, a flash control signal detection unit 3, a flash check output unit 4, a lighting control output unit 5 and a feedback detection unit 6; the microcontroller 2 is connected to each working unit of the electronic flasher through corresponding ports: the flash check control relay SNJKJ, the dual-way switching relay QHJ, the lighting control relay SNJ, the lighting control relay ISNJⅠ and the lighting control relay IISNJⅡ are all reed switch relays; the dynamic drive circuit 501, the dynamic drive circuit I0511, the dynamic drive circuit II0521, the dynamic drive circuit III401 and the dynamic drive circuit IV701 have the same structure; the external dimensions and contact pin numbers of the electronic flasher comply with the standard "GB / T 7417-2010 The requirements of the Railway Signal AX Series Relay are as follows: the lead-out contact 31 is connected to the positive pole of the power supply unit, contacts 2 and 4 are connected to the negative pole of the power supply unit, the lead-out contact 13 is connected to the external flash control signal, and the lead-out contacts 51 and 52 are respectively connected to the common point of the second group of contact switches QHJ2 of the dual-way switching relay and the external lighting control circuit.

[0075] The difference is that the control module is a redundant control module, including two control modules with identical structures: a first control module and a second control module. That is, the lighting control output unit 5 includes two identical lighting control output circuits: lighting control output circuit I 051 and lighting control output circuit II 052. The feedback detection unit includes two identical feedback detection circuits: feedback detection circuit I 61 and feedback detection circuit II 62. The lighting control output circuit I and feedback detection circuit I together with the microcontroller constitute the first control module, and the lighting control output circuit II and feedback detection circuit II together with the microcontroller constitute the second control module.

[0076] The lighting control output circuit I051 includes a dynamic drive circuit I511 and a lighting control relay ISNJ I. The coil of the lighting control relay ISNJ I is connected to the control port of the microcontroller through the dynamic drive circuit I, and the contact switch of the lighting control relay ISNJ I is connected in series between the C1 end and the D1 end of the first sampling wire segment C1D1. The lighting control output circuit II052 includes a dynamic drive circuit II521 and a lighting control relay IISNJ II. The coil of the lighting control relay IISNJ II is connected to the control port of the microcontroller through the dynamic drive circuit II, and the contact switch of the lighting control relay IISNJ II is connected in series between the C2 end and the D2 end of the second sampling wire segment C2D2.

[0077] The feedback detection circuit I 61 includes a current transformer I 611, a rectifier and filter circuit I 612, and a signal conditioning circuit I 613. The primary side of the current transformer I of the feedback detection circuit I is coupled to the first sampling wire segment C1D1, the secondary side of the current transformer I is sequentially connected to the rectifier and filter circuit I and the signal conditioning circuit I, and the output end of the signal conditioning circuit I is connected to an input port of the microcontroller; the feedback detection circuit II 62 includes a current transformer II 621, a rectifier and filter circuit II 622, and a signal conditioning circuit II 623; the primary side of the current transformer II of the feedback detection circuit II is coupled to the second sampling wire segment C2D2, the secondary side of the current transformer II is sequentially connected to the rectifier and filter circuit II and the signal conditioning circuit II, and the output end of the signal conditioning circuit II is connected to an input port of the microcontroller;

[0078] The lighting control output circuit I and the lighting control output circuit II as well as the feedback detection circuit I and the feedback detection circuit II are respectively switched and connected to the microcontroller and the external lighting control circuit via the switching circuit 7;

[0079] The switching circuit includes a dynamic drive circuit IV 701 and a dual-way switching relay QHJ. The coil of the dual-way switching relay QHJ is connected to a control port of the microcontroller through the dynamic drive circuit IV. The common contact of the first group of contact switches QHJ1 of the dual-way switching relay is connected to a control port of the microcontroller. The normal contact and normally open point of the contact switch are respectively connected to the input ends of the dynamic drive circuit I of the lighting control output circuit I and the dynamic drive circuit II of the lighting control output circuit II; the common contact of the second group of contact switches QHJ2 of the dual-way switching relay is connected to the external lighting control circuit, and the normal contact and normally open point of the contact switch are respectively connected to the first sampling wire segment C1D1 and the second sampling wire segment C2D2.

[0080] During normal operation, the first control module is in operation by default, that is, the common contact of the first group of contact switches QHJ1 is connected to the normal contact, thereby connecting the dynamic drive circuit I of the lighting control output circuit I to the microcontroller, and the common contact of the second group of contact switches QHJ2 is connected to the normal contact, thereby connecting the first sampling wire segment C1D1 to the external lighting control circuit; when the dual-way switching relay QHJ is energized, the common contact of the first group of contact switches QHJ1 is connected to the normally open point, thereby connecting the dynamic drive circuit II of the lighting control output circuit II to the microcontroller, and the common contact of the second group of contact switches QHJ2 is connected to the normally open point, thereby connecting the second sampling wire segment C2D2 to the external lighting control circuit, and the second control module is in operation.

[0081] The working principle of the electronic flasher:

[0082] The flash control signal detection unit 3 receives the external flash control signal through the electronic flash lead-out contact 13, and outputs it to the microcontroller after isolation, shaping and amplification. The microcontroller outputs the control signal (square wave signal) to the lighting control output unit. The dynamic drive circuit of the lighting control output unit drives the lighting control relay to attract, and connects the external lighting control circuit through its contact switch. The lighting control circuit is turned on and the flash light is on. When the microcontroller stops outputting the square wave signal, the lighting control relay is released, the external lighting control circuit is interrupted and the flash light is turned off, thereby achieving the purpose of "flashing yellow light".

[0083] Since the electronic flasher has a redundant control module, during normal operation, the dual-way switching relay will select one of the control modules for lighting control, and the other control module will be on standby. The microcontroller receives the output signal of the lighting action feedback detection circuit corresponding to the working system, and compares it with the control signal output to the dynamic drive circuit of the lighting control relay to see whether the lighting action is normal. When the two signals are inconsistent, it is determined that the currently working lighting control module has a fault. The microprocessor then controls the dual-way switching relay to disconnect the faulty control circuit from the external lighting control circuit and connect the standby control module to the external lighting control circuit to continue flash control.

[0084] Working principle of dynamic drive circuit:

[0085] Figure 7 When the DT signal is at a stable high level, only a charging circuit is formed, and there is no discharging circuit, so the circuit has no output. When the DT signal is at a stable low level, only a discharging circuit is formed, and there is no charging circuit, so the circuit also has no output. Only when a continuous square wave signal is input at its input end will there be a DC voltage output.

[0086] Note: Figure 7The load JDQ shown in the figure generally refers to each reed switch relay, including the flash check control relay SNJKJ, the dual-way switching relay QHJ, the lighting control relay SNJ, the lighting control relay ⅠSNJⅠ and the lighting control relay ⅡSNJⅡ.

Claims

1. An electronic flasher for controlling yellow flashing and yellow lighting of railway signals, comprising a power supply unit (1); Its characteristics are: Each working unit of the electronic flasher comprises a microcontroller (2), a flash control signal detection unit (3), a flash check output unit (4), a lighting control output unit (5) and a feedback detection unit (6), wherein the microcontroller is connected to each working unit of the electronic flasher via corresponding ports: A flash control signal detection unit (3) for receiving an external flash control signal is connected to a receiving port of the microcontroller (2); The input end of the flash check output unit (4) for controlling the working state of the flash check relay (SNJJ) of the external lighting control circuit is connected to the output port of the microcontroller, and the output end of the flash check output unit (4) is connected to the flash check relay circuit of the external lighting control circuit; The input end of the lighting control output unit (5) for outputting a lighting control signal is connected to a control port of the microcontroller, and the output end is connected to an external lighting control circuit; The feedback end of the feedback detection unit (6) for obtaining the operating state of the external lighting control circuit is connected to the input port of the microcontroller, and the sampling end of the feedback detection unit (6) is connected to the external lighting control circuit through a sampling wire segment (CD); The flash check output unit (4) includes a dynamic drive circuit III (401) and a flash check control relay (SNJKJ), wherein the coil of the flash check control relay (SNJKJ) is connected to an output port of the microcontroller via the dynamic drive circuit III, and the contact switch of the flash check control relay (SNJKJ) is connected in series between the coil of the flash check relay (SNJJ) of the external lighting control circuit and the power supply; The lighting control output unit (5) includes a lighting control output circuit, and the lighting control output circuit includes a dynamic drive circuit and a lighting control relay; the feedback detection unit (6) includes a feedback detection circuit, and the feedback detection circuit includes a current transformer, a rectifier filter circuit and a signal conditioning circuit; The lighting control output unit (5) and the feedback detection unit (6) and the microcontroller (2) form a control module for connecting or disconnecting the external lighting control circuit, and the control module is a standard control module or a redundant control module; When the control module is a standard control module, the lighting control output unit (5) includes a lighting control output circuit (50), and the feedback detection unit includes a feedback detection circuit (60); The lighting control output circuit (50) includes a dynamic drive circuit (501) and a lighting control relay (SNJ), the coil of the lighting control relay (SNJ) is connected to the control port of the microcontroller via the dynamic drive circuit, and the contact switch of the lighting control relay (SNJ) is connected in series between the two ends of the sampling wire segment (CD); The feedback detection circuit (60) includes a current transformer (601), a rectifier filter circuit (602), and a signal conditioning circuit (603). The primary side of the current transformer of the feedback detection circuit is coupled to a sampling conductor segment (CD), the sampling conductor segment (CD) is directly connected in parallel to an external lighting control circuit, the secondary side of the current transformer (601) is sequentially connected to the rectifier filter circuit (602) and the signal conditioning circuit (603), and the output end of the signal conditioning circuit is connected to an input port of a microcontroller. When the control module is a redundant control module, it includes two control modules with the same structure: a first control module and a second control module, that is, the lighting control output unit (5) includes two identical lighting control output circuits: lighting control output circuit I (051) and lighting control output circuit II (052), and the feedback detection unit includes two identical feedback detection circuits: feedback detection circuit I (61) and feedback detection circuit II (62); the lighting control output circuit I and feedback detection circuit I and the microcontroller constitute a first control module, and the lighting control output circuit II and feedback detection circuit II and the microcontroller constitute a second control module; The lighting control output circuit I (051) includes a dynamic drive circuit I (511) and a lighting control relay I (SNJ I), the coil of the lighting control relay I (SNJ I) is connected to the control port of the microcontroller through the dynamic drive circuit I (511), and the contact switch of the lighting control relay I (SNJ I) is connected in series between the C1 end and the D1 end of the first sampling wire segment (C1D1); the lighting control output circuit II (052) includes a dynamic drive circuit II (521) and a lighting control relay II (SNJ II), the coil of the lighting control relay II (SNJ II) is connected to the control port of the microcontroller through the dynamic drive circuit II (521), and the contact switch of the lighting control relay II (SNJ II) is connected in series between the C2 end and the D2 end of the second sampling wire segment (C2D2); The feedback detection circuit I (61) includes a current transformer I (611), a rectifier filter circuit I (612) and a signal conditioning circuit I (613), wherein the primary side of the current transformer I is coupled to the first sampling wire segment (C1D1), the secondary side of the current transformer I is connected to the rectifier filter circuit I and the signal conditioning circuit I in sequence, and the output end of the signal conditioning circuit I is connected to an input port of the microcontroller; The feedback detection circuit II (62) includes a current transformer II (621), a rectifier filter circuit II (622) and a signal conditioning circuit II (623); the primary side of the current transformer II is coupled to the second sampling wire segment (C2D2), the secondary side of the current transformer II is connected to the rectifier filter circuit II and the signal conditioning circuit II in sequence, and the output end of the signal conditioning circuit II is connected to an input port of the microcontroller; The lighting control output circuit I and the lighting control output circuit II as well as the feedback detection circuit I and the feedback detection circuit II are respectively connected to the microcontroller and the external lighting control circuit through the switching circuit (7); the switching circuit (7) includes a dynamic drive circuit IV (701) and a dual-way switching relay (QHJ), the coil of the dual-way switching relay (QHJ) is connected to a control port of the microcontroller through the dynamic drive circuit IV (701), and the first group of contact switches (QHJ1) of the dual-way switching relay (QHJ) is connected to the microcontroller. The common contact is connected to a control port of the microcontroller, and the normal contact and normally open point of the contact switch are respectively connected to the input ends of the dynamic drive circuit I (511) of the lighting control output circuit I (051) and the dynamic drive circuit II (521) of the lighting control output circuit II (052); the common contact of the second group of contact switches (QHJ2) of the dual-way switching relay is connected to the external lighting control circuit, and the normal contact and normally open point of the contact switch are respectively connected to the first sampling wire segment (C1D1) and the second sampling wire segment (C2D2).

2. An electronic flasher for controlling yellow flashing and yellow lighting of railway signals according to claim 1, characterized in that: The flash check control relay (SNJKJ), dual-way switching relay (QHJ), lighting control relay (SNJ), lighting control relay I (SNJ I) and lighting control relay II (SNJ II) are all reed switch relays; The dynamic drive circuit (501), dynamic drive circuit I (511), dynamic drive circuit II (521), dynamic drive circuit III (401) and dynamic drive circuit IV (701) have the same structure, including a first transistor (UA1), a second transistor (UA2), a third transistor (UA3), a fourth transistor (UA4), a first electrolytic capacitor (C3) and a second electrolytic capacitor (C4), the first transistor, the second transistor and the third transistor (UA3) are NPN type, and the fourth transistor is PNP type; The base of the first transistor (UA1) is connected to the input signal through the sixth resistor (R6), and its emitter is connected to the negative pole of the power supply. The collector of the first transistor (UA1) is connected to the base of the second transistor (UA2) and is connected to the positive pole of the power supply through the fifth resistor (R5) and the third resistor (R3); The collector of the second transistor (UA2) is connected to the base of the third transistor (UA3) and the fourth transistor (UA4) and is connected to the positive electrode of the power supply through the eighth resistor R8, and its emitter is connected to the negative electrode of the power supply; The emitters of the third transistor (UA3) and the fourth transistor (UA4) are connected to the positive electrode of the first electrolytic capacitor (C3), the negative electrode of the first electrolytic capacitor (C3) is connected to the negative electrode of the power supply through the first diode (D1), and the negative electrode of the first electrolytic capacitor (C3) is also connected to the contact 2 of the load (JDQ) through the second diode (D2). The contact 1 of the load (JDQ) is connected to the negative electrode of the power supply, and the load (JDQ) contacts 1 and 2 are connected in parallel to the second electrolytic capacitor (C4).

3. An electronic flasher for controlling yellow flashing and yellow lighting of railway signals as claimed in claim 2, Its characteristics are: The electronic flasher's dimensions and contact pin numbering comply with the requirements of the standard "GB / T 7417-2010 Railway Signal AX Series Relays," where lead contact 31 is connected to the positive pole of the power supply unit, lead contacts 2\4 are connected to the negative pole of the power supply unit, lead contact 13 is connected to the external flash control signal, and lead contacts 51 and 52 are connected to the common point of the second group of contact switches (QHJ2) of the dual-way switching relay (QHJ) and the external lighting control circuit, respectively.

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