WO2023207680A1

WO2023207680A1 - Led railway signal lamp system and intelligent lighting unit thereof

Info

Publication number: WO2023207680A1
Application number: PCT/CN2023/089021
Authority: WO
Inventors: 杨健荣
Original assignee: 厦门荣汇源科技有限公司
Priority date: 2022-04-24
Filing date: 2023-04-18
Publication date: 2023-11-02
Also published as: CN114802349A

Abstract

An LED railway signal lamp system and an intelligent lighting unit (100) thereof. In the intelligent lighting unit (100), a control module (110) acquires, from fault detection modules (131, 132), detection results of corresponding LED lamp beads (210, 220) and loops thereof; when the detection results of the two LED lamp beads (210, 220) and the loops thereof meet a first condition, the control module controls, by means of two constant-current driving modules (121, 122), the two LED lamp beads (210, 220) to be alternately in a lit state; when the detection results thereof meet a second condition, the control module controls, by means of the corresponding constant-current driving modules (121, 122), the normal LED lamp beads (210, 220) to be constantly in the lit state, and gives an alarm by means of an alarm module (140); and when the detection results thereof neither meet the first condition nor the second condition, the control module controls, by means of a power supply control module (160), the two constant-current driving modules (121, 122) to stop operating, so as to trigger a first alarm (300) to give an alarm.

Description

LED railway signal light system and its intelligent lighting unit

Technical field

The present invention relates to the field of railway signal lights, and in particular to an LED railway signal light system and its intelligent lighting unit.

Background technique

At present, railway signal lights use tungsten light sources and contain railway signal bulbs with primary and secondary circuits. Moreover, the lighting monitoring and control device is used to monitor and control the work of the primary and secondary circuits. Moreover, when the primary circuit fails, it automatically switches When the auxiliary circuit works, the alarm will be issued at the same time. However, existing lighting monitoring and control devices have problems: 1) There are two main and auxiliary circuits. Only the main circuit works for a long time, while the auxiliary circuit is inactive for a long time, resulting in high failure rate and short life; The two secondary loops cannot self-switch in real time; 3) They cannot self-test and require professional technicians to go to the site for regular inspections.

technical problem

The technical problem to be solved by the present invention is that the existing technology has the defects of high failure rate, short life, inability to switch autonomously, and the need for regular inspection by professionals.

Technical solutions

The technical solution adopted by the present invention to solve the technical problem is to construct an intelligent lighting unit of an LED railway signal light system, which is connected to a railway signal bulb containing two LED lamp beads and a first alarm arranged at the front end, including a power module. , control module, alarm module, power control module, two constant current drive modules, two fault detection modules, among which,

The control module obtains the detection results of the corresponding LED lamp beads and their circuits from the fault detection module, and based on the detection results of the two LED lamp beads and their circuits, when the first condition is met, the control module passes the detection results of the two LED lamp beads and their circuits. The constant current drive module controls the two LED lamp beads to be in a lighting state alternately; when the second condition is met, the normal LED lamp bead is controlled to be in a constant lighting state through the corresponding constant current drive module, and the alarm module Make an alarm; when neither the first condition nor the second condition is satisfied, the power control module controls the two constant current drive modules to stop working to trigger the first alarm to alarm. ;

The first condition is: both LED lamp beads and their circuits are normal;

The second condition is: one LED lamp bead and its circuit are normal, and another LED lamp bead or its circuit has an open circuit fault or the other LED lamp bead has a light attenuation fault.

Preferably, the constant current drive module includes a constant current drive chip, a first switch tube, an inductor, and a current detection resistor, wherein the power end of the constant current drive chip is connected to the drive power supply positive end of the power control module, so The brightness adjustment end of the constant current drive chip is connected to the corresponding LED control output end of the control module, the drive end of the constant current drive chip is connected to the control end of the first switch tube, and the first end of the first switch tube passes through The inductor is connected to the negative end of the corresponding LED lamp bead, the second end of the first switch tube is grounded through the current detection resistor, and the second end of the first switch tube is also connected to the constant current driver chip. Current detection terminal.

Preferably, the fault detection module includes: an amplifier and a comparator, wherein the input end of the amplifier is connected to the second end of the first switch tube of the corresponding constant current drive module, and the output end of the amplifier is connected to the comparator. The first input terminal of the comparator inputs a reference voltage, and the output terminal of the comparator is connected to the fault detection input terminal of the control module.

Preferably, the alarm module includes a first push-pull circuit and a second alarm, and the first input end of the first push-pull circuit is connected to the first fault output end of the control module, and the first push-pull circuit The second input end of the circuit is connected to the second fault output end of the control module, the positive output end of the first push-pull circuit is connected to the first end of the relay coil of the second alarm, and the first push-pull circuit The negative output end of the circuit and the second end of the relay coil of the second alarm are both grounded.

Preferably, the power control module includes a second push-pull circuit and a power control relay, and the first input end of the second push-pull circuit is connected to the third fault output end of the control module, and the second push-pull circuit The second input end of the circuit is connected to the fourth fault output end of the control module, the positive output end of the second push-pull circuit is connected to the first end of the coil of the power control relay, and the second push-pull circuit is connected to the first end of the coil of the power control relay. The negative output terminal and the second end of the coil of the power control relay are grounded together. The movable contact of the switch of the power control relay is the positive terminal of the drive power supply. The normally open contact of the switch of the power control relay is connected to the The positive pole of the LED power supply of the power module, the normally closed contact of the switch of the power control relay is suspended, and when the moving contact is connected to the normally closed contact, the first alarm has its relay coil If the current is lower than the pickup current, an alarm will occur.

Preferably, it also includes:

An indication module connected to the control module and used for indicating status according to the output signal of the control module.

Preferably, the indication module includes a first LED indicator light, a second LED indicator light and a third LED indicator light, wherein the positive terminal of the first LED indicator light, the positive terminal of the second LED indicator light and The positive terminal of the third LED indicator light is respectively connected to the power supply voltage, and the negative terminal of the first LED indicator light, the negative terminal of the second LED indicator light and the negative terminal of the third LED indicator light are respectively connected to the The corresponding output terminal of the control module, and the first LED indicator light emits light when the first LED lamp bead fails, the second LED indicator light emits light when the second LED lamp bead fails, and the third LED indicator light emits light when the second LED lamp bead fails. The three LED indicators flash and glow when the intelligent lighting unit is operating normally.

Preferably, the power module includes a transformer, a first rectifier bridge, a second rectifier bridge, and a DC/DC converter, wherein two input ends of the transformer are connected to the AC power supply, and the output ends of the transformer are respectively connected to the The input terminal of the first rectifier bridge and the input terminal of the second rectifier bridge. The output terminal of the first rectifier bridge is connected to the input terminal of the DC/DC converter. The output terminal of the DC/DC converter is Control the power supply terminal; the output terminal of the second rectifier bridge is the LED power supply terminal.

Preferably, it also includes:

The first SPD protection module used to protect the connected AC power supply from lightning strikes and surges;

A second SPD protection module used to protect the two constant current drive modules from lightning surges.

The invention also constructs an LED railway signal light system, which is connected to the first alarm installed at the front end, including:

Railway signal light bulb containing two LED lamp beads;

The above-mentioned intelligent lighting unit.

beneficial effects

Implementing the technical solution of the present invention, due to the adoption of modular processing, the use of dual-loop automatic cycle switching working mode to replace the long-term working mode of only one loop, and the use of automatic detection solutions to replace manual regular on-site detection methods, ensure stable and efficient operation, while reducing At the same time, the failure rate is increased, and the service life is improved. Moreover, since professional and technical maintenance personnel are no longer required to go to the site for regular inspections, work efficiency is greatly improved and operating costs are reduced, and the safety hazards of human factors are eliminated, truly achieving Intelligent system.

Description of the drawings

The present invention will be further described below in conjunction with the accompanying drawings and examples. In the accompanying drawings:

Figure 1 is a logical structure diagram of Embodiment 1 of the LED railway signal light system of the present invention;

2A to 2M are circuit diagrams of Embodiment 1 of the intelligent lighting unit of the present invention.

Embodiments of the invention

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present invention.

Figure 1 is a logical structure diagram of the first embodiment of the LED railway signal light system of the present invention. The LED railway signal light system of this embodiment includes an intelligent lighting unit 100 and a railway signal light bulb containing two LED lamp beads 210 and 220. In addition, the LED railway signal light system The signal light system is also connected to the first alarm 300 arranged at the front end.

The intelligent lighting unit 100 of this embodiment includes a control module 110, two constant current drive modules 121, 122, two fault detection modules 131, 132, an alarm module 140, a power module 150, a power control module 160, and, LED lamp beads 210 forms a loop with the constant current drive module 121 and the fault detection module 131, and the LED lamp bead 220 forms another loop with the constant current drive module 122 and the fault detection module 132. Among them, the control module 110 obtains the detection results of the corresponding LED lamp beads and their circuits from the fault detection modules 131 and 132 (the detection results include short circuit faults, open circuit faults, and lamp light decay faults), and based on the two LED lamp beads 210, 220 and The test results of the circuit, when the first condition is met, are: the two LED lamp beads and their circuit are normal, and the two constant current drive modules 121, 122 control the two LED lamp beads 210, 220 to alternately Lighting state; when the second condition is met, the second condition is: one of the LED lamp beads and its circuit is normal, and the other LED lamp bead or its circuit has an open circuit fault or the other LED lamp bead suffers from light decay. If there is a fault, the corresponding constant current drive module controls the normal LED lamp beads to be in a constant lighting state, and an alarm is issued through the alarm module 140; when neither the first condition nor the second condition is met, the power supply is activated. The control module 160 controls the two constant current driving modules 121 and 122 to stop working to trigger the first alarm 300 to issue an alarm. It should be noted here that the first alarm 300 is set at the front end (main control room), and its relay drive coil is connected in series with the primary side winding of the transformer of the power module. When the two constant current drive modules 121 and 122 stop working , the two LED lamp beads 210 and 220 do not light up, and the current of the entire intelligent lighting unit becomes smaller. The first alarm triggers an alarm because the current on its relay driving coil is much lower than the pickup current.

Through the technical solution of this embodiment, the two LED lamp beads and their circuit are not divided into primary and secondary. Moreover, when the first condition is met (both LED lamp beads and their circuit are normal), the control module controls one of the LEDs. After the lamp bead has been working for a period of time, it will automatically switch to another LED lamp bead to work. After the current LED lamp bead has been working for a period of time, it will automatically switch to another LED lamp bead to work, thus causing the two lighting circuits to switch in cycles. When the second condition is met (one LED lamp bead and its circuit are normal, and another LED lamp bead or its circuit has an open circuit fault or the other LED lamp bead has a light attenuation fault), at this time, immediately switch to The normal LED lamp beads work, and the alarm module sends out an alarm signal. When neither the first condition nor the second condition is satisfied, at this time, the two constant current driving modules stop working, and the first alarm 300 at the front end sends out an alarm signal.

The technical solution of this embodiment adopts modular processing, uses a dual-loop automatic cycle switching working mode to replace the long-term working mode of only one loop, and uses an automatic detection solution to replace the manual regular on-site detection method, ensuring stable and efficient operation and reducing faults. At the same time, the service life is improved, and since professional and technical maintenance personnel are no longer required to go to the site for inspection on a regular basis, the work efficiency is greatly improved and the operating costs are reduced, and the safety hazards of human factors are eliminated, truly achieving intelligent type system.

Further, the intelligent lighting unit also includes an indication module, a first SPD protection module, and a second SPD protection module, wherein the indication module is connected to the control module and is used for status indication according to the output signal of the control module; the first SPD protection module It is used to protect the connected AC power supply from lightning strikes and surges; the second SPD protection module is used to protect the two constant current drive modules from lightning strikes and surges.

2A to 2M are circuit diagrams of Embodiment 1 of an intelligent lighting unit of the present invention. The intelligent lighting unit of this embodiment includes a control module, two constant current drive modules, two fault detection modules, an alarm module, a power module, and a power control module. , indication module, first SPD protection module, second SPD protection module, the circuit structure and working principle of each module will be described in detail below:

In this embodiment, with reference to FIG. 2A and FIG. 2B , the power module mainly includes a transformer U1, a first rectifier bridge D2, a second rectifier bridge D1, and DC/DC converters U3 and U2. Among them, transformer U1 is a multi-input single-output transformer. It has 4 voltage input ports, which are 200V, 210V, 220V, 230V 50Hz AC input ports. When using, select the corresponding input port according to the external input voltage. The output voltage of the transformer U1 is AC 9V, and its output terminal is connected to the input terminal of the first rectifier bridge D2 and the input terminal of the second rectifier bridge D1 respectively. The output terminal of the first rectifier bridge D2 is connected to the DC/DC converter U3. At the input end, the output end DVDD5V of the DC/DC converter U3 outputs a power supply voltage of 5V and is connected to the input end of the DC/DC converter U2. The output end DVDD3V3 of the DC/DC converter U2 outputs a power supply voltage of 3.3V, that is, The output end of DC/DC converter U2 is the control power supply end. The output terminal of the second rectifier bridge D1 is the positive pole of the LED power supply, and outputs the LED power supply voltage DVDD10. In addition, the positive electrodes of electrolytic capacitors C12 and C13 are respectively connected to the positive output terminal of the first rectifier bridge D2, the positive electrode of electrolytic capacitor C8 and one end of capacitor C9 are respectively connected to the positive output terminal of DC/DC converter U3, and the positive electrode of electrolytic capacitor C10 and one end of capacitor C11 are respectively connected to the positive output end of DC/DC converter U2, the negative electrode of electrolytic capacitor C12, the negative electrode of electrolytic capacitor C13, the negative electrode of electrolytic capacitor C8, the other end of capacitor C9, the negative electrode of electrolytic capacitor C10 and capacitor C11 The other ends are grounded respectively. The positive electrodes of electrolytic capacitors C5 and C8, one end of capacitor C7, and one end of resistor R9 are respectively connected to the positive output end of the second rectifier bridge D1. The negative electrodes of electrolytic capacitors C5 and C8, the other end of capacitor C7, and the other end of resistor R9 are connected to ground respectively. . Resistors R10, R11, and R71 are connected in parallel and one end is connected to the driving power supply positive end (LED+) of the power control module, and the other end is connected to ground.

In this embodiment, with reference to Figure 2A, there are four first SPD protection modules, and they respectively correspond to the four input ports of the transformer U1. Each first SPD protection module contains a varistor, a PTC thermistor and a safety capacitor. The following takes the first SPD protection module connected to the 230V AC input port as an example to illustrate the structure of the surge protection module. The varistor R5 is connected between the 230V input port and the neutral line N, and one end of the PTC thermistor R1 is connected to the 230V The input port is connected, the other end is connected to one end of the safety capacitor C1, and the other end of the safety capacitor C1 is connected to the neutral line N. It should be understood that the structures of other first SPD protection modules are similar to the structure of the surge protection module, and will not be described again here.

In this embodiment, combined with Figure 2C and Figure 2D, the control module mainly includes: MCU U5, resistors R12, R18, R21, R22, R23, R30, R32, R33, R34, R35, R64, R65, R66, R72, Capacitors C18, C19, C22, C23. Resistors R64, R65 and pin 27 of MCU U5 constitute the first LED drive signal, and resistors R12, R66 and pin 26 of MCU U5 constitute the second LED drive signal. The resistors R22, R30 and the 13th pin of MCU U5 and the resistors R21, R72 and the 30th pin of MCU U5 constitute the drive control pin of the alarm module. The resistors R32, R35 and the 14th pin of the MCU U5 and the resistors R33, R34 and the 19th pin of the MCU U5 constitute the control pin of the power control module. Pin 5 of MCU U5 is the RST pin, used for power-on reset. The 22nd pin of MCU U5 is connected to the operation indication pin of the indication module, the 20th pin of MCU U5 is connected to the first LED operation status indication pin of the indication module, and the 21st pin of MCU U5 is connected to the second LED operation status indication pin of the indication module. foot. The 10th and 28th pins of MCU U5 are respectively connected to the detection pins of two fault detection modules. Pins 23 and 24 of MCU U5 are programming pins.

In this embodiment, with reference to Figure 2E, the constant current drive module corresponding to the first LED lamp bead mainly includes a constant current drive chip U6, a switch tube Q1, an inductor L1, and three parallel current detection resistors R24, R25, and R26. , the switch tube Q1 is a MOS tube. It should be understood that in other embodiments, other types of switch tubes can also be used, and the three parallel resistors R24, R25, and R26 can also be replaced by resistors in other connection forms. In this embodiment, the power supply terminal (VDD) of the constant current driver chip U6 is connected to the driving power supply positive terminal (LED+) through the resistor R13, and the brightness adjustment terminal (DIM) of the constant current driver chip U6 is connected to the corresponding LED control output terminal of the control module. (PWM_LED1), the driving terminal (DRV) of the constant current driver chip U6 is connected to the gate of the MOS tube Q1, the drain of the MOS tube Q1 is connected to the negative terminal of the corresponding LED lamp bead (LED1-) through the inductor L1, and the source of the MOS tube Q1 The pole is grounded through the parallel current detection resistors R24, R25, and R26, and the source of the MOS tube Q1 is also connected to the current detection terminal (CS) of the constant current driver chip U6.

Similarly, with reference to Figure 2F, the constant current drive module corresponding to the second LED lamp bead mainly includes a constant current drive chip U7, a switch tube Q2, an inductor L2, and three parallel current detection resistors R27, R28, and R29. Q2 is a MOS tube. It should be understood that in other embodiments, other types of switch tubes can also be used, and the three parallel resistors R27, R28, and R29 can also be replaced by resistors in other connection forms. In this embodiment, the power supply terminal (VDD) of the constant current driver chip U7 is connected to the driving power supply positive terminal (LED+) through the resistor R14, and the brightness adjustment terminal (DIM) of the constant current driver chip U7 is connected to the corresponding LED control output terminal of the control module. (PWM_LED2), the driving terminal (DRV) of the constant current driver chip U7 is connected to the gate of the MOS tube Q2, the drain of the MOS tube Q2 is connected to the negative terminal of the corresponding LED lamp bead (LED2-) through the inductor L2, and the source of the MOS tube Q2 The pole is grounded through the parallel current detection resistors R27, R28, and R29, and the source of the MOS tube Q2 is also connected to the current detection terminal (CS) of the constant current driver chip U7.

In this embodiment, the fault detection module includes: an amplifier and a comparator, wherein the input end of the amplifier is connected to the second end of the first switch tube of the corresponding constant current drive module, and the output end of the amplifier is connected to the first input end of the comparator. , the second input terminal of the comparator inputs the reference voltage, and the output terminal of the comparator is connected to the fault detection input terminal of the control module. Combined with Figure 2G, in the fault detection module corresponding to the first LED lamp bead, the amplifier consists of resistors R38, R42, R46 and operational amplifier U8.2, and the comparator consists of resistors R48, R49, R44 and operational amplifier U8.1. Moreover, the current detection terminal (LED1_IN) of the constant current driver chip U6 is connected to the third pin of the operational amplifier U8.2 through the resistor R38. The second pin of the operational amplifier U8.2 is connected to the ground through the resistor R42 and connected to the ground through the resistor R46. to the 1st pin, the 1st pin of the op amp U8.2 is connected to the 5th pin of the op amp U8.1 through the resistor R40. After the resistors R48 and R49 are connected in series, one end is connected to the 3.3V power supply voltage and the other end is connected to the ground. The resistors R48 and The common end of R49 is connected to the 6th pin of the operational amplifier U8.1, and the 7th pin of the operational amplifier U8.1 is connected to the 10th pin (LED1_ERROR) of U5 of the MCU.

Similarly, in the fault detection module corresponding to the second LED lamp bead, the amplifier consists of resistors R39, R43, R47 and operational amplifier U9.2, and the comparator consists of resistors 50, R51, R45 and operational amplifier U9.1. Moreover, the current detection terminal (LED2_IN) of the constant current driver chip U6 is connected to the third pin of the operational amplifier U9.2 through the resistor R39. The second pin of the operational amplifier U9.2 is connected to the ground through the resistor R43 and connected to the ground through the resistor R47. to the 1st pin, the 1st pin of the op amp U9.2 is connected to the 5th pin of the op amp U9.1 through the resistor R41. After the resistors R50 and R51 are connected in series, one end is connected to the power supply voltage of 3.3V, and the other end is connected to the ground. The resistors R50 and The common end of R51 is connected to the 6th pin of the operational amplifier U9.1, and the 7th pin of the operational amplifier U9.1 is connected to the 28th pin (LED2_ERROR) of U5 of the MCU.

In this embodiment, the alarm module includes a first push-pull circuit and a second alarm, and the first input end of the first push-pull circuit is connected to the first fault output end of the control module, and the second input end of the first push-pull circuit is connected to the first fault output end of the control module. The terminal is connected to the second fault output terminal of the control module, the positive output terminal of the first push-pull circuit is connected to the first terminal of the relay coil of the second alarm, the negative output terminal of the first push-pull circuit and the relay coil of the second alarm are connected The second end is also grounded. Combining Figure 2H and Figure 2I, the first push-pull circuit mainly consists of MOS transistors Q5 and Q6, transformer T2, diodes D10 and D12, and electrolytic capacitor C28. Moreover, pins 13 and 30 (PWM1, PWM2) of MCU U5 pass through the MOS driver chip U15 and serve as the control pins (PWM1_A, PWM2_B) of MOS tubes Q5 and Q6. The 5V supply voltage is connected to the center tap (pin 3) of the input end of transformer T2 through resistor R69 and diode D14. Pin 1 of transformer T2 is connected to the drain of MOS tube Q5, and pin 5 of transformer T2 is connected to the MOS tube. The drain of Q6 and the sources of MOS tubes Q5 and Q6 are connected to ground. The 6th and 10th pins of transformer T2 are connected to the anodes of diodes D10 and D12 respectively. The cathodes of diodes D10 and D12 are respectively connected to the anode of electrolytic capacitor C28 and the cathode of diode D11. The 8th pin of transformer T2, the cathode of electrolytic capacitor C28 and the diode The positive terminal of D11 is connected to ground. The two input terminals of the relay coil of the second alarm K2 are respectively connected to the positive and negative terminals of the electrolytic capacitor C28. The 3rd and 4th pins of the relay of the second alarm K2 are common terminals, and the 1st pin is a normally closed terminal. 6 feet is the usual starting point. During normal operation, the two MOS switch tubes Q5 and Q6 are alternately turned on at the same switching frequency of 200KHz, and the duty cycle of each switch tube is less than 50%, leaving a certain dead time to prevent MOS tubes Q5 and Q6 from switching on at the same time. conduction. The push-pull inverter at the front stage inverts the input DC low voltage into AC high-frequency low voltage, which is sent to the primary side of the high-frequency transformer T2. Through the coupling of the transformer T2, the AC high-frequency voltage is obtained on the secondary side, and then passes through the inverter. After rectification and filtering formed by fast recovery diodes D10 and D12, the desired DC voltage is obtained to make the relay close. When any LED lamp bead or its circuit has an open circuit fault, or any LED lamp bead suffers from light attenuation, the normally closed end of the relay is closed by controlling the MOS tubes Q5 and Q6 to turn off, generating an alarm signal and triggering the second end of the back end. Alarm K2 sounds the alarm.

In this embodiment, the power control module includes a second push-pull circuit and a power control relay, and the first input end of the second push-pull circuit is connected to the third fault output end of the control module, and the second input end of the second push-pull circuit is connected to the third fault output end of the control module. The terminal is connected to the fourth fault output terminal of the control module, the positive output terminal of the second push-pull circuit is connected to the first terminal of the coil of the power control relay K1, the negative output terminal of the second push-pull circuit and the third terminal of the coil of the power control relay K1 are connected. Both ends are grounded together. The moving contact (pin 1) of the switch of the power control relay K1 is the positive terminal of the drive power supply (LED+). The normally open contact (pin 3) of the switch of the power control relay K1 is connected to the power supply module. The positive pole of the LED power supply (DVDD10), the normally closed contact (pin 4) of the switch of the power control relay K1 is floating, and when the moving contact is connected to the normally closed contact, the two constant current driver chips U6 and U7 are not connected. When the power supply voltage is connected, only the MCU is left to work in the entire intelligent lighting unit. At this time, the primary side current of transformer U1 is much less than 10mA, and because the coil of the first alarm is connected in series with the primary side winding of the transformer, the first alarm The current of its relay coil is lower than the pickup current and an alarm is issued. Combining Figure 2J and Figure 2K, the second push-pull circuit mainly consists of MOS transistors Q3 and Q4, transformer T1, diodes D7, D9, and electrolytic capacitor C26. Moreover, the 14th and 19th pins (PWM3, PWM4) of MCU U5 are used as the control pins (PWM3_A, PWM4_B) of MOS tubes Q3 and Q4 after being stabilized by the MOS driver chip U14. The 5V supply voltage is connected to the 3rd pin of the center tap of the input terminal of the transformer T1 through the diode D13. The 1st and 5th pins of the input terminal of the transformer T1 are respectively connected to the drain of the MOS tube Q3, the D pole of the MOS tube Q4, and the D terminal of the MOS tube Q3 and Q4. Source connected to ground. The 6th and 10th terminals of the output terminals of transformer T1 are respectively connected to the anodes of diodes D7 and D9. The cathodes of diodes D7 and D9 are connected to the positive terminal of electrolytic capacitor C26 and the cathode of diode D8. The negative terminal of electrolytic capacitor C26 and the anode of diode D8 are grounded. Pin 8 of transformer T1 is connected to ground. The first pin of the power control relay is the common terminal, that is, the positive terminal of the drive power supply (LED+), the fourth pin is the normally closed terminal, and the third pin is the normally open terminal, and is connected to the 10V supply voltage output by the second rectifier bridge (DVDD10). The power control module is used to control the power module. If both LED lamp beads or their circuits have open-circuit faults, or any LED lamp beads or their circuits have short-circuit faults, or both LED lamp beads have light attenuation; Or, when one LED lamp bead has a light attenuation fault and another LED lamp bead or its circuit has an open circuit fault, shut down the two constant current drive modules to minimize the current in the entire circuit, causing the first alarm in the main control room to be remote due to the current. If the pickup current is lower than the pickup current, an alarm will occur.

In this embodiment, with reference to Figure 2L, the indication module includes a first LED indicator L1, a second LED indicator L2 and a third LED indicator L3, wherein the positive terminal of the first LED indicator L1, the second LED indicator The positive terminal of the lamp L2 and the positive terminal of the third LED indicator light L3 are respectively connected to the supply voltage of 3.3V. The negative terminal of the first LED indicator light L1, the negative terminal of the second LED indicator light L2 and the third LED indicator light L3 The negative terminals are respectively connected to the corresponding output terminals LED1, LED2, and LED3 of the control module, and the first LED indicator light L1 emits light when the first LED lamp bead fails, and the second LED indicator light L2 emits light when the second LED lamp bead fails. The three-LED indicator light L3 flashes and glows when the intelligent lighting unit is operating normally.

In this embodiment, combined with Figure 2M, the second SPD protection module can be used to protect the two constant current drive modules from lightning surges. Specifically, one leg of the ceramic discharge tube D17 is connected to two LED lights. The anode of the LED lamp bead (LED+OUT) is connected to the TVS tube D19 through the resettable fuse F2 to form the anode lightning surge protection circuit of the LED lamp bead. One leg of the ceramic discharge tube D20 is connected to the cathode (LEN1-IN) of the first LED lamp bead, and is connected to the TVS tube D21 through the resettable fuse F3, forming the cathode lightning surge protection circuit of the first LED lamp bead. One leg of the ceramic discharge tube D18 is connected to the cathode of the second LED lamp bead, and is connected to the TVS tube D22 through the resettable fuse F4, forming a cathode lightning surge protection circuit for the second LED lamp bead. When a lightning strike occurs, the energy is quickly released through the corresponding ceramic discharge tube and then through the resettable fuse and TVS tube to stabilize the residual voltage within an acceptable range.

The working principle of the intelligent lighting unit of this embodiment is explained below with reference to Figures 2A to 2M: the AC voltage output by the AC power supply is converted into a 9V AC voltage through the transformer U1, and then divided into two channels, one of which passes through the first rectifier bridge D2 and DC in sequence. /DC converters U3 and U2 can obtain 5V DC power supply voltage and 3.3V DC power supply voltage to power the control module; the other channel can obtain 10V DC power supply voltage through the second rectifier bridge D1 to power the two Powered by an LED lamp bead.

When the first LED lamp bead needs to be lit, pin 27 of MCU U5 outputs a high level to cause the constant current driver chip U6 to start working, and pin 26 of MCU U5 outputs a low level to cause the constant current driver chip U7 to stop working. . When the constant current driver chip U6 is working, its first pin outputs a high level, and the MOS tube Q1 is turned on. The 10V DC power supply voltage forms a current loop to the ground through the first LED lamp bead, power inductor L1, MOS tube Q1 and current detection resistors R24, R25 and R26. The constant current driver chip U6 adjusts the output frequency of its pin 1 based on the voltage drop detected by its pin 6 to form a stable current to drive the LED lamp bead to operate normally. Similarly, when the second LED lamp bead needs to be lit, the working principle is similar and will not be described again here.

In addition, when the intelligent lighting unit is working, MCU U5 also determines whether the working LED lamp beads and their circuits (circuit of the constant current drive module and fault detection module) are normal based on the information fed back by the fault detection module. Moreover, if it is working If the LED lamp bead and its circuit are normal, the PWM signal detected by MCU U5 through the fault detection module is within the preset frequency range; if the working LED lamp bead and its circuit have an open circuit fault, or the LED lamp bead has an If there is a light attenuation fault, the PWM signal detected by the MCU U5 through the fault detection module will be lower than the lower limit of the preset frequency range; if a short circuit fault occurs in the working LED lamp bead and its circuit, the MCU U5 will detect the fault through the fault detection module. The detected PWM signal will be higher than the upper limit of the preset frequency range. Taking the first channel as an example, the sampling voltage is amplified through the amplifier circuit and then the signal is input to pin 10 of the MCU through the comparison circuit. Moreover, when the LED lamp beads and their circuits work normally, MCU U5 will detect PWM signals in a certain frequency range (100KHz-250KHz). However, if an open circuit failure occurs in the LED lamp bead or its circuit, or the voltage drop of the LED lamp bead changes due to other light attenuation, the frequency of the detected PWM signal will be reduced to less than 100KHz; if the LED lamp bead or its circuit In the event of a short circuit fault, the frequency of the detected PWM signal will be greater than 250KHz. Therefore, MCU U5 can determine whether the currently lit LED lamp bead and its circuit are normal based on the frequency of the PWM signal it detects.

If MCU U5 detects that the second condition is met during operation (one LED lamp bead and its circuit are normal, and another LED lamp bead or its circuit has an open circuit fault or the other LED lamp bead has a light attenuation fault), Then the second alarm K2 is controlled to output the alarm signal through its 13th and 30th pins. If MCU U5 detects that neither the first condition nor the second condition is met during operation (both LED lamp beads or their circuits have open circuit faults, or any LED lamp beads or their circuits have short circuit faults, or both LED lamp beads or their circuits have short circuit faults, All LED lamp beads have a light attenuation fault; or if one LED lamp bead has a light attenuation fault and another LED lamp bead or its circuit has an open circuit fault), the power supply control relay K1 will be closed through its pin 14 and pin 19. The power supply of the two LED lamp beads minimizes the current of the entire circuit and causes the first alarm in the main control room to sound an alarm because the current is lower than the pickup current.

In addition, when MCU U5 is burned or broken down due to severe interference, the LED lamp beads will not be able to work. At the same time, the power supply circuit will not be maintained, and the primary side current of transformer U1 will be reduced to less than 10mA, which will also trigger the first alarm on the primary side. , at the same time, because the second alarm relay of the intelligent lighting unit cannot be driven, the contact will automatically fall to the alarm position, generating a lamp failure alarm. When MCU U5 works normally, but the circuit of the alarm module is abnormal, the second alarm will also generate an alarm because it cannot get the driving source.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the claims of the present invention.

Claims

An intelligent lighting unit of an LED railway signal light system, which is connected to a railway signal bulb containing two LED lamp beads and a first alarm set at the front end. It is characterized by including a power module, a control module, an alarm module, and a power control module. , two constant current drive modules, two fault detection modules, among which,

The control module obtains the detection results of the corresponding LED lamp beads and their circuits from the fault detection module, and based on the detection results of the two LED lamp beads and their circuits, when the first condition is met, the control module passes the detection results of the two LED lamp beads and their circuits. The constant current drive module controls the two LED lamp beads to be in a lighting state alternately; when the second condition is met, the normal LED lamp bead is controlled to be in a constant lighting state through the corresponding constant current drive module, and the alarm module Make an alarm; when neither the first condition nor the second condition is satisfied, the power control module controls the two constant current drive modules to stop working to trigger the first alarm to alarm. ;

The first condition is: both LED lamp beads and their circuits are normal;

The second condition is: one LED lamp bead and its circuit are normal, and another LED lamp bead or its circuit has an open circuit fault or the other LED lamp bead has a light attenuation fault.
The intelligent lighting unit according to claim 1, wherein the constant current drive module includes a constant current drive chip, a first switch tube, an inductor, and a current detection resistor, wherein the power end of the constant current drive chip is connected to The drive power supply positive end of the power control module, the brightness adjustment end of the constant current drive chip is connected to the corresponding LED control output end of the control module, and the drive end of the constant current drive chip is connected to the control end of the first switch tube. , the first end of the first switch tube is connected to the negative end of the corresponding LED lamp bead through the inductor, the second end of the first switch tube is grounded through the current detection resistor, and the first end of the first switch tube is connected to the negative end of the corresponding LED lamp bead. The second terminal is also connected to the current detection terminal of the constant current driver chip.
The intelligent lighting unit according to claim 2, characterized in that the fault detection module includes: an amplifier and a comparator, wherein the input end of the amplifier is connected to the second end of the first switch tube of the corresponding constant current drive module. , the output terminal of the amplifier is connected to the first input terminal of the comparator, the second input terminal of the comparator inputs a reference voltage, and the output terminal of the comparator is connected to the fault detection input terminal of the control module.
The intelligent lighting unit according to claim 1, wherein the alarm module includes a first push-pull circuit and a second alarm, and the first input end of the first push-pull circuit is connected to the control module. The first fault output terminal, the second input terminal of the first push-pull circuit is connected to the second fault output terminal of the control module, and the positive output terminal of the first push-pull circuit is connected to the relay of the second alarm The first end of the coil, the negative output end of the first push-pull circuit and the second end of the relay coil of the second alarm are both grounded.
The intelligent lighting unit according to claim 1, wherein the power control module includes a second push-pull circuit and a power control relay, and the first input end of the second push-pull circuit is connected to the control module. The third fault output terminal, the second input terminal of the second push-pull circuit is connected to the fourth fault output terminal of the control module, and the positive output terminal of the second push-pull circuit is connected to the coil of the power control relay. The first end, the negative output end of the second push-pull circuit and the second end of the coil of the power control relay are both grounded, and the movable contact of the switch of the power control relay is the positive end of the drive power supply. The normally open contact of the switch of the power control relay is connected to the positive electrode of the LED power supply of the power module, the normally closed contact of the switch of the power control relay is suspended, and the moving contact is connected to the normally closed contact. When, the first alarm sounds an alarm because the current of the relay coil is lower than the pull-in current.
The intelligent lighting unit according to claim 1, further comprising:

An indication module connected to the control module and used for indicating status according to the output signal of the control module.
The intelligent lighting unit according to claim 6, wherein the indication module includes a first LED indicator light, a second LED indicator light and a third LED indicator light, wherein the positive terminal of the first LED indicator light , the positive terminal of the second LED indicator light and the positive terminal of the third LED indicator light are respectively connected to the supply voltage, the negative terminal of the first LED indicator light, the negative terminal of the second LED indicator light and the The negative terminals of the third LED indicator light are respectively connected to the corresponding output terminals of the control module, and the first LED indicator light emits light when the first LED lamp bead fails, and the second LED indicator light emits light when the first LED lamp bead fails. The second LED lamp bead emits light when it fails, and the third LED indicator light flashes and emits light when the intelligent lighting unit is operating normally.
The intelligent lighting unit according to claim 1, wherein the power module includes a transformer, a first rectifier bridge, a second rectifier bridge, and a DC/DC converter, wherein two input ends of the transformer are connected to an AC Power supply, the output end of the transformer is connected to the input end of the first rectifier bridge and the input end of the second rectifier bridge respectively, and the output end of the first rectifier bridge is connected to the input end of the DC/DC converter , the output terminal of the DC/DC converter is the control power supply terminal; the output terminal of the second rectifier bridge is the LED power supply terminal.
The intelligent lighting unit according to claim 1, further comprising:

The first SPD protection module used to protect the connected AC power supply from lightning strikes and surges;

A second SPD protection module used to protect the two constant current drive modules from lightning surges.
An LED railway signal light system, connected to the first alarm set at the front end, is characterized by including:

Railway signal light bulb containing two LED lamp beads;

The intelligent lighting unit according to any one of claims 1-9.