CN114802349A

CN114802349A - LED railway signal lamp system and intelligent lighting unit thereof

Info

Publication number: CN114802349A
Application number: CN202210435631.0A
Authority: CN
Inventors: 杨健荣
Original assignee: Xiamen Ronghuiyuan Technology Co ltd
Current assignee: Xiamen Ronghuiyuan Technology Co ltd
Priority date: 2022-04-24
Filing date: 2022-04-24
Publication date: 2022-07-29
Also published as: WO2023207680A1

Abstract

The invention discloses an LED railway signal lamp system and an intelligent lighting unit thereof.A control module acquires detection results of corresponding LED lamp beads and loops thereof from a fault detection module in the intelligent lighting unit, and controls the two LED lamp beads to be in a lighting state alternately through two constant current driving modules according to the detection results of the two LED lamp beads and the loops thereof when a first condition is met; when a second condition is met, the corresponding constant current driving module controls the normal LED lamp beads to be constantly in a lighting state, and the alarm module gives an alarm; and when the first condition is not met and the second condition is not met, the two constant current driving modules are controlled to stop working through the power supply control module so as to trigger the first alarm to give an alarm. By implementing the technical scheme, the failure rate and the operating cost are reduced, and the service life and the working efficiency are improved.

Description

LED railway signal lamp system and intelligent lighting unit thereof

Technical Field

The invention relates to the field of railway signal lamps, in particular to an LED railway signal lamp system and an intelligent lighting unit thereof.

Background

At present, a railway signal lamp adopts a tungsten filament light source and comprises a railway signal bulb with a main loop and an auxiliary loop, a lighting monitoring and controlling device is used for monitoring and controlling the work of the main loop and the auxiliary loop, and when the main loop breaks down, the operation is automatically switched to the work of the auxiliary loop and an alarm is given. However, the conventional lighting monitoring control device has problems: 1) the system is provided with a main loop and an auxiliary loop, only the main loop works for a long time, and the auxiliary loop is in a non-working state for a long time, so that the fault rate is high, and the service life is short; 2) the main loop and the auxiliary loop can not be switched in real time; 3) the self-detection can not be realized, and a professional technician is required to go to the field for detection regularly.

Disclosure of Invention

The invention aims to solve the technical problems that in the prior art, the fault rate is high, the service life is short, the automatic switching cannot be realized, and the regular detection of professionals is required, and provides an LED railway signal lamp system and an intelligent lighting unit thereof.

The technical scheme adopted by the invention for solving the technical problems is as follows: an intelligent lighting unit of an LED railway signal lamp system is constructed, is connected with a railway signal lamp bulb containing two LED lamp beads and a first alarm arranged at the front end, and comprises a power supply module, a control module, an alarm module, a power supply control module, two constant current driving modules and two fault detection modules, wherein,

the control module acquires detection results of the corresponding LED lamp beads and loops thereof from the fault detection module, and controls the two LED lamp beads to be in a lighting state alternately through the two constant current driving modules when a first condition is met according to the detection results of the two LED lamp beads and the loops thereof; when a second condition is met, the corresponding constant current driving module controls the normal LED lamp beads to be constantly in a lighting state, and the alarm module gives an alarm; when the first condition is not met and the second condition is not met, the two constant current driving modules are controlled to stop working through the power supply control module so as to trigger the first alarm to give an alarm;

the first condition is: the two LED lamp beads and the loops thereof are normal;

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

Preferably, the constant current driving module includes a constant current driving chip, a first switch tube, an inductor, and a current detection resistor, wherein a power supply end of the constant current driving chip is connected to a positive driving power supply end of the power control module, a brightness adjustment end of the constant current driving chip is connected to a corresponding LED control output end of the control module, a driving end of the constant current driving chip is connected to a control end of the first switch tube, a first end of the first switch tube is connected to a negative end of the corresponding LED lamp bead through the inductor, a second end of the first switch tube is grounded through the current detection resistor, and the second end of the first switch tube is further connected to a current detection end of the constant current driving chip.

Preferably, the fault detection module comprises: the input end of the amplifier is connected with the second end of the first switching tube of the corresponding constant current driving module, the output end of the amplifier is connected with the first input end of the comparator, the second input end of the comparator inputs reference voltage, and the output end of the comparator is connected with the fault detection input end of the control module.

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

Preferably, the power control module comprises a second push-pull circuit and a power control relay, and a first input end of the second push-pull circuit is connected with a third fault output end of the control module, a second input end of the second push-pull circuit is connected with a fourth fault output end of the control module, the positive output end of the second push-pull circuit is connected with the first end of the coil of the power supply control relay, the negative output end of the second push-pull circuit and the second end of the coil of the power supply control relay are grounded together, the moving contact of the switch of the power supply control relay is a driving power supply positive end, the normally open contact of the switch of the power supply control relay is connected with the anode of the LED power supply of the power supply module, the normally closed contact of the switch of the power supply control relay is suspended, and in addition, when the moving contact is connected with the normally closed contact, the first alarm gives an alarm because the current of the relay coil of the first alarm is lower than the pull-in current.

Preferably, the method further comprises the following steps:

and the indicating module is connected with the control module and used for indicating the state according to the output signal of the control module.

Preferably, the indicating module comprises a first LED indicating lamp, a second LED indicating lamp and a third LED indicating lamp, wherein the positive end of the first LED indicating lamp, the positive end of the second LED indicating lamp and the positive end of the third LED indicating lamp are respectively connected with a power supply voltage, the negative end of the first LED indicating lamp, the negative end of the second LED indicating lamp and the negative end of the third LED indicating lamp are respectively connected with the corresponding output ends of the control module, the first LED indicating lamp emits light when the first LED lamp bead fails, the second LED indicating lamp emits light when the second LED lamp bead fails, and the third LED indicating lamp emits light when the intelligent lighting unit normally operates.

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 an ac power supply, an output end of the transformer is respectively connected to an input end of the first rectifier bridge and an input end of the second rectifier bridge, an output end of the first rectifier bridge is connected to an input end of the DC/DC converter, and an output end of the DC/DC converter is a power supply control end; and the output end of the second rectifier bridge is a power supply end of the LED.

Preferably, the method further comprises the following steps:

the first SPD protection module is used for carrying out lightning surge protection on the accessed alternating-current power supply;

and the second SPD protection module is used for carrying out lightning surge protection on the two constant current driving modules.

The invention also constructs an LED railway signal lamp system which is connected with a first alarm arranged at the front end, and the LED railway signal lamp system comprises:

the railway signal lamp bulb comprises two LED lamp beads;

the intelligent lighting unit of any one of claims 1-9.

By implementing the technical scheme of the invention, because the modular processing is adopted, the mode that only one loop works for a long time is replaced by adopting the double-loop automatic circulation switching working mode, and the manual regular field detection mode is replaced by adopting the automatic detection scheme, the stable and high-efficiency operation is ensured, the fault rate is reduced, the service life is prolonged, in addition, the regular field detection by professional technical maintenance personnel is not needed any more, the working efficiency is greatly improved, the operation cost is reduced, the potential safety hazard of human factors is eliminated, and the intelligent system is really realized.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a logical block diagram of a first embodiment of an LED railway signal lamp system of the present invention;

fig. 2A to 2M are circuit diagrams of a first embodiment of the intelligent lighting unit according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is a logical structure diagram of an embodiment of the LED railway signal lamp system according to the present invention, the LED railway signal lamp system of the embodiment includes an intelligent lighting unit 100 and a railway signal lamp bulb including two

LED lamp beads

210 and 220, and the LED railway signal lamp system is further connected to a first alarm 300 disposed at a front end.

The intelligent lighting unit 100 of this embodiment includes a control module 110, two constant

current driving modules

121 and 122, two

fault detection modules

131 and 132, an alarm module 140, a power supply module 150, and a power supply control module 160, where the LED lamp bead 210, the constant current driving module 121 and the fault detection module 131 form a loop, and the LED lamp bead 220, the constant current driving module 122 and the fault detection module 132 form another loop. Wherein, the control module 110 obtains the detection results (the detection results include short-circuit fault, open-circuit fault, lamp bead light decay fault) of the corresponding LED lamp beads and the corresponding loops from the

fault detection modules

131 and 132, and according to the detection results of the two

LED lamp beads

210 and 220 and the corresponding loops, when the first condition is satisfied, the first condition is: the two LED lamp beads and loops thereof are normal, and the two constant

current driving modules

121 and 122 are used for controlling the two

LED lamp beads

210 and 220 to be in a lighting state alternately; when the second condition is satisfied, the second condition is: one LED lamp bead and a loop thereof are normal, and the other LED lamp bead or the loop thereof has an open circuit fault or the other LED lamp bead has a light attenuation fault, the normal LED lamp bead is controlled to be constantly in a lighting state by the corresponding constant current driving module, and an alarm is given by the alarm module 140; when the first condition is not met, and the second condition is not met, the power control module 160 controls the two constant

current driving modules

121 and 122 to stop working, so as to trigger the first alarm 300 to alarm. It should be noted that the first alarm 300 is disposed at the front end (main control room), and the relay driving coil thereof is connected in series with the primary side winding of the transformer of the power module, when the two constant

current driving modules

121 and 122 stop working, neither of the two

LED lamp beads

210 and 220 lights up, the current of the whole intelligent lighting unit becomes small, and the first alarm triggers an alarm because the current on the relay driving coil thereof is far lower than the pull-in current.

Through the technical scheme of the embodiment, the two LED lamp beads and the loops thereof have no major-minor difference, when a first condition (the two LED lamp beads and the loops thereof are normal) is met, the control module controls one LED lamp bead to work for a period of time and then automatically switches to the other LED lamp bead to work, and after the current LED lamp bead works for a period of time, the current LED lamp bead is automatically switched to the other LED lamp bead to work, so that the two lighting loops are circularly switched to work. When a second condition (one LED lamp bead and a loop thereof are normal, and the other LED lamp bead or the loop thereof has a circuit breaking fault or the other LED lamp bead has a light attenuation fault) is met, the normal LED lamp bead is immediately switched to work, and the alarm module sends out an alarm signal. When the first condition is not met and the second condition is not met, at the moment, the two constant current driving modules stop working, and the first alarm 300 at the front end sends out an alarm signal.

The technical scheme of the embodiment adopts the modularized treatment, adopts the double-loop automatic circulation switching working mode to replace the mode of only one loop working for a long time, adopts the automatic detection scheme to replace the manual regular field detection mode, ensures stable and efficient operation, reduces the failure rate, prolongs the service life, and greatly improves the working efficiency and reduces the operation cost because professional technical maintenance personnel do not need to detect on the field at regular intervals, and eliminates the potential safety hazard of human factors, thereby really realizing an intelligent system.

Furthermore, the intelligent lighting unit further comprises 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 indicating the state according to the output signal of the control module; the first SPD protection module is used for carrying out lightning surge protection on the accessed alternating current power supply; and the second SPD protection module is used for carrying out lightning surge protection on the two constant current driving modules.

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

in this embodiment, referring to fig. 2A and 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. The transformer U1 is a multi-input single-output transformer, and has 4 voltage input ports, namely 200V, 210V, 220V and 230V 50Hz alternating current input ports, and when in use, the corresponding input ports are selected according to the external input voltage. The output voltage of the transformer U1 is ac 9V, and the output end of the transformer is connected to the input end of the first rectifier bridge D2 and the input end of the second rectifier bridge D1, the output end of the first rectifier bridge D2 is connected to the input end of the DC/DC converter U3, the output end DVDD5V of the DC/DC converter U3 outputs a 5V supply voltage, and is connected to the input end of the DC/DC converter U2, and the output end DVDD3V3 of the DC/DC converter U2 outputs a 3.3V supply voltage, that is, the output end of the DC/DC converter U2 is a control supply power end. The output end of the second rectifier bridge D1 is the anode of the LED power supply, and outputs the LED power supply voltage DVDD 10. Positive electrodes of electrolytic capacitors C12 and C13 are connected to the positive output terminal of first rectifier bridge D2, positive electrodes of electrolytic capacitors C8 and one end of capacitor C9 are connected to the positive output terminal of DC/DC converter U3, positive electrodes of electrolytic capacitors C10 and one end of capacitor C11 are connected to the positive output terminal of DC/DC converter U2, and negative electrodes of electrolytic capacitors C12, C13, C8, the other end of capacitor C9, negative electrodes of electrolytic capacitors C10, and the other end of capacitor C11 are grounded, respectively. The anodes of the electrolytic capacitors C5 and C8, one end of the capacitor C7 and one end of the resistor R9 are respectively connected with the positive output end of the second rectifier bridge D1, and the cathodes of the electrolytic capacitors C5 and C8, the other end of the capacitor C7 and the other end of the resistor R9 are respectively grounded. The resistors R10, R11 and R71 are connected in parallel, one end of the resistor is connected with a driving power supply positive end (LED +) of the power supply control module, and the other end of the resistor is grounded.

In this embodiment, referring to fig. 2A, there are four first SPD protection modules, and the four first SPD protection modules correspond to the four input ports of the transformer U1. Each first SPD protection module comprises a voltage dependent resistor, a PTC thermistor and a safety capacitor. The structure of the surge protection module is described by taking the first SPD protection module connected to the 230V ac input port as an example, the voltage dependent resistor R5 is connected between the 230V input port and the neutral line N, one end of the PTC thermistor R1 is connected to the 230V input port, 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 structure of the other first SPD protection module is similar to that of the surge protection module, and is not described herein.

In this embodiment, with reference to fig. 2C and 2D, the control module mainly includes: MCU U5, resistance R12, R18, R21, R22, R23, R30, R32, R33, R34, R35, R64, R65, R66, R72, capacitance C18, C19, C22, C23. The resistors R64 and R65 and the 27 th pin of the MCU U5 form a first path of LED driving signals, and the resistors R12 and R66 and the 26 th pin of the MCU U5 form a second path of LED driving signals. The 13 th pin of the resistors R22 and R30 and the MCU U5 and the 30 th pin of the resistors R21 and R72 and the MCU U5 form a driving control pin of the alarm module. The 14 th pin of the resistors R32 and R35 and the MCU U5 and the 19 th pin of the resistors R33 and R34 and the MCU U5 form a control pin of the power control module. Pin 5 of MCU U5 is the RST pin for power on reset. The 22 th pin of the MCU U5 is connected with an operation indicating pin of an indicating module, the 20 th pin of the MCU U5 is connected with a first path of LED operation state indicating pin of the indicating module, and the 21 st pin of the MCU U5 is connected with a second path of LED operation state indicating pin of the indicating module. The 10 th pin and the 28 th pin of the MCU U5 are respectively connected with the detection pins of the two fault detection modules.

Pins

23 and 24 of the MCU U5 are burning pins.

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

Similarly, referring to fig. 2F, the constant current driving module corresponding to the second LED lamp bead mainly includes a constant current driving chip U7, a switching tube Q2, an inductor L2, and three parallel current detection resistors R27, R28, and R29, where the switching tube Q2 is an MOS transistor. It should be understood that in other embodiments, other types of switching tubes may be used as the switching tubes, and the three parallel resistors R27, R28, R29 may be replaced by resistors in other connection forms. In this embodiment, a power supply end (VDD) of the constant current driving chip U7 is connected to a driving power supply positive end (LED +) through a resistor R14, a brightness adjustment end (DIM) of the constant current driving chip U7 is connected to a corresponding LED control output end (PWM _ LED2) of the control module, a driving end (DRV) of the constant current driving chip U7 is connected to a gate of the MOS transistor Q2, a drain of the MOS transistor Q2 is connected to a negative end (LED2-) of the corresponding LED lamp bead through an inductor L2, a source of the MOS transistor Q2 is grounded through current detection resistors R27, R28, and R29 connected in parallel, and a source of the MOS transistor Q2 is further connected to a current detection end (CS) of the constant current driving chip U7.

In this embodiment, the fault detection module includes: the input end of the amplifier is connected with the second end of the first switching tube of the corresponding constant current driving module, the output end of the amplifier is connected with the first input end of the comparator, the second input end of the comparator inputs reference voltage, and the output end of the comparator is connected with the fault detection input end of the control module. Referring to fig. 2G, in the fault detection module corresponding to the first LED lamp bead, the amplifier is composed of resistors R38, R42, R46 and an operational amplifier U8.2, and the comparator is composed of resistors R48, R49, R44 and an operational amplifier U8.1. Moreover, a current detection end (LED1_ IN) of the constant current driving chip U6 is connected to the 3 rd pin of the operational amplifier U8.2 through a resistor R38, the 2 nd pin of the operational amplifier U8.2 is connected to the ground through a resistor R42 and is connected to the 1 st pin through a resistor R46, the 1 st pin of the operational amplifier U8.2 is connected to the 5 th pin of the operational amplifier U8.1 through a resistor R40, one end of the resistor R48 is connected to a 3.3V power supply voltage after being connected IN series with the resistor R49, the other end of the resistor R48 is connected to the ground, a common end of the resistors R48 and R49 is connected to the 6 th pin of the operational amplifier U8.1, and the 7 th pin of the operational amplifier U8.1 is connected to the 10 th pin (LED1_ ERROR) of the U5 of the MCU.

Similarly, in the fault detection module corresponding to the second LED lamp bead, the amplifier is composed of resistors R39, R43, R47 and an operational amplifier U9.2, and the comparator is composed of resistors 50, R51, R45 and an operational amplifier U9.1. Moreover, a current detection end (LED2_ IN) of the constant current driving chip U6 is connected to the 3 rd pin of the operational amplifier U9.2 through a resistor R39, the 2 nd pin of the operational amplifier U9.2 is connected to the ground through a resistor R43 and is connected to the 1 st pin through a resistor R47, the 1 st pin of the operational amplifier U9.2 is connected to the 5 th pin of the operational amplifier U9.1 through a resistor R41, after the resistor R50 and the resistor R51 are connected IN series, one end of the resistor R50 is connected to a 3.3V power supply voltage, the other end of the resistor R51 is connected to the ground, the common end of the resistors R50 and the R51 is connected to the 6 th pin of the operational amplifier U9.1, and the 7 th pin of the operational amplifier U9.1 is connected to the 28 th pin (LED2_ ERROR) of the U5 of the MCU.

In this embodiment, the alarm module includes a first push-pull circuit and a second alarm, and a first input end of the first push-pull circuit is connected to a first fault output end of the control module, a second input end of the first push-pull circuit is connected to a second fault output end of the control module, a positive output end of the first push-pull circuit is connected to a first end of a relay coil of the second alarm, and a negative output end of the first push-pull circuit and a second end of the relay coil of the second alarm are grounded together. With reference to fig. 2H and fig. 2I, the first push-pull circuit mainly includes MOS transistors Q5 and Q6, a transformer T2, diodes D10 and D12, and an electrolytic capacitor C28. The 13 th and 30 th pins (PWM1 and PWM2) of the MCU U5 pass through the MOS driver chip U15 and then serve as the control pins (PWM1_ A, PWM2_ B) of the MOS transistors Q5 and Q6. The 5V supply voltage is connected to the center tap (pin 3) of the input terminal of the transformer T2 through the resistor R69 and the diode D14, the pin 1 of the transformer T2 is connected to the drain of the MOS transistor Q5, the pin 5 of the transformer T2 is connected to the drain of the MOS transistor Q6, and the sources of the MOS transistors Q5 and Q6 are connected to ground.

Pins

6 and 10 of the transformer T2 are connected to the anodes of diodes D10 and D12, respectively, the cathodes of diodes D10 and D12 are connected to the anode of electrolytic capacitor C28 and the cathode of diode D11, respectively, and pin 8 of transformer T2, the cathode of electrolytic capacitor C28 and the anode of diode D11 are grounded. Two input ends of a relay coil of the second alarm K2 are respectively connected with the anode and the cathode of the electrolytic capacitor C28, the 3 rd pin and the 4 th pin of the relay of the second alarm K2 are public ends, the 1 st pin is a normally closed end, and the 6 th pin is a normally open end. When the MOS transistor is in normal operation, the two MOS switching tubes Q5 and Q6 are alternately conducted at the same switching frequency of 200KHz, the duty ratio of each switching tube is less than 50%, and a certain dead time is reserved to avoid the MOS transistors Q5 and Q6 from being conducted simultaneously. The input direct current low voltage is inverted into alternating current high frequency low voltage by the front stage push-pull inversion, the alternating current high frequency low voltage is sent to the primary side of a high frequency transformer T2, alternating current high frequency voltage is obtained on the secondary side through the coupling of a transformer T2, and expected direct current voltage is obtained after rectification and filtering which are formed by reverse fast recovery diodes D10 and D12, so that the relay is pulled in. When any LED lamp bead or the loop thereof has an open circuit fault or any LED lamp bead has light attenuation, the normally closed end of the relay is closed by controlling the MOS tubes Q5 and Q6 to be switched off, an alarm signal is generated, and the second alarm K2 at the rear end is triggered to alarm.

In this embodiment, the power control module includes a second push-pull circuit and a power control relay, a first input end of the second push-pull circuit is connected to a third fault output end of the control module, a second input end of the second push-pull circuit is connected to a fourth fault output end of the control module, a positive output end of the second push-pull circuit is connected to a first end of a coil of the power control relay K1, a negative output end of the second push-pull circuit and a second end of the coil of the power control relay K1 are grounded together, a moving contact (pin 1) of a switch of the power control relay K1 is a driving power supply positive end (LED +), a normally open contact (pin 3) of a switch of the power control relay K1 is connected to a LED power supply positive electrode (DVDD10) of the power module, a contact (pin 4) of a switch of the power control relay K1 is normally closed and is suspended, and when the moving contact is normally closed, two constant current driving chips U6, a constant current driving chip and a power supply chip, The U7 has no power supply voltage, the whole intelligent lighting unit only remains the MCU to work, at the moment, the primary side current of the transformer U1 is far less than 10mA, and the coil of the first alarm is connected with the primary side winding of the transformer in series, so the first alarm gives an alarm because the current of the relay coil of the first alarm is lower than the pull-in current. With reference to fig. 2J and 2K, the second push-pull circuit mainly includes MOS transistors Q3 and Q4, a transformer T1, diodes D7 and D9, and an electrolytic capacitor C26. The 14 th and 19 th pins (PWM3 and PWM4) of the MCU U5 are regulated by the MOS driver chip U14 and then serve as control pins (PWM3_ A, PWM4_ B) of the MOS transistors Q3 and Q4. The 5V power supply voltage is connected with a 3 rd pin of a middle tap of the input end of the transformer T1 through a diode D13, the 1 st pin and the 5 th pin of the input end of the transformer T1 are respectively connected to a D pole of a drain MOS tube Q4 of the MOS tube Q3, and sources of the MOS tubes Q3 and Q4 are connected to the ground. The 6 th and 10 th output ends of the transformer T1 are respectively connected with the anodes of the diodes D7 and D9, the cathodes of the diodes D7 and D9 are connected with the positive end of the electrolytic capacitor C26 and the cathode of the diode D8, and the negative end of the electrolytic capacitor C26 and the anode of the diode D8 are grounded. Pin 8 of transformer T1 is connected to ground. The 1 st pin of the power control relay is a common terminal, namely, a driving power supply positive terminal (LED +), the 4 th pin thereof is a normally closed terminal, the 3 rd pin thereof is a normally open terminal, and the power control relay is connected with a 10V power supply voltage (DVDD10) output by the second rectifier bridge. The power supply control module is used for controlling the power supply module, and if the two LED lamp beads or loops thereof have open circuit faults, or any one LED lamp bead or loop thereof has short circuit faults, or both the two LED lamp beads have light attenuation; or when one LED lamp bead has a light attenuation fault and the other LED lamp bead or the loop of the other LED lamp bead has a circuit breaking fault, the two constant current driving modules are closed, so that the current of the whole circuit is minimum, and the first alarm of the master control room gives an alarm because the current is far lower than the pull-in current.

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

In this embodiment, with reference to fig. 2M, the second SPD protection module may be configured to perform lightning surge protection on the two constant current driving modules, specifically, one pin of the ceramic discharge tube D17 is connected to anodes (LED + OUT) of the two LED lamp beads, and is connected to the TVS tube D19 through the self-recovery fuse F2, so as to form an anode lightning surge protection circuit for the LED lamp beads. One pin of the ceramic discharge tube D20 is connected with the cathode (LEN1-IN) of the first LED lamp bead and is connected to the TVS tube D21 through a self-recovery fuse F3, so that a cathode lightning stroke surge protection circuit of the first LED lamp bead is formed. One pin of the ceramic discharge tube D18 is connected with the cathode of the second LED lamp bead and is connected to the TVS tube D22 through the self-recovery fuse F4, so that a cathode lightning surge protection circuit of the second LED lamp bead is formed. When lightning strike occurs, energy is quickly released through the corresponding ceramic discharge tube and then released through the self-recovery fuse and the TVS tube, so that residual voltage is stabilized within an acceptable range.

The working principle of the intelligent lighting unit of the embodiment is described below with reference to fig. 2A to 2M: alternating voltage output by the alternating current power supply is converted into 9V alternating voltage through a transformer U1, then the alternating voltage is divided into two paths, one path of the alternating voltage sequentially passes through a first rectifier bridge D2, a DC/DC converter U3 and a U2 to obtain 5V direct current power supply voltage and 3.3V direct current power supply voltage, and therefore power is supplied to the control module; the other path can acquire 10V direct current supply voltage after passing through a second rectifier bridge D1 to supply power for the two LED lamp beads.

When the first path of LED lamp beads are required to be lightened, the 27 th pin of the MCU U5 outputs a high level to enable the constant current driving chip U6 to start working, and the 26 th pin of the MCU U5 outputs a low level to enable the constant current driving chip U7 to stop working. When the constant current driving chip U6 works, the 1 st pin outputs high level, and the MOS tube Q1 is conducted. A10V direct-current power supply voltage forms a current loop to the ground through a first path of LED lamp beads, a power inductor L1, an MOS tube Q1 and current detection resistors R24, R25 and R26. The constant current driving chip U6 adjusts the output frequency of the 1 st pin according to the voltage drop detected by the 6 th pin to form stable current so as to drive the LED lamp bead to normally work. Similarly, when the second path of LED lamp beads needs to be lit, the working principle is similar, and is not described herein again.

In addition, when the intelligent lighting unit works, the MCU U5 also judges whether the working LED lamp beads and the loops (circuits of the constant current driving module and the fault detection module) thereof are normal according to the information fed back by the fault detection module, and if the working LED lamp beads and the loops thereof are normal, the PWM signals detected by the MCU U5 through the fault detection module are in a preset frequency range; if the LED lamp bead and the loop thereof which are working have an open circuit fault or the LED lamp bead has a light attenuation fault, the PWM signal detected by the MCU U5 through the fault detection module is lower than the lower limit value of the preset frequency range; if the LED lamp bead and the loop of the LED lamp bead are in short circuit fault, the PWM signal detected by the MCU U5 through the fault detection module is higher than the upper limit value of the preset frequency range. Taking the first path as an example, the sampling voltage is amplified by the amplifying circuit, and then the signal is input to the 10 th pin of the MCU by the comparing circuit. And when the LED lamp bead and the loop thereof work normally, the MCU U5 detects PWM signals in a certain frequency range (100KHz-250 KHz). However, if the LED lamp bead or the loop thereof has an open circuit fault or the LED lamp bead has a voltage drop change due to light attenuation, the frequency of the detected PWM signal is reduced to be less than 100 KHz; if the LED lamp bead or the loop of the LED lamp bead has a short-circuit fault, the frequency of the detected PWM signal is larger than 250 KHz. Therefore, the MCU U5 can determine whether the currently lit LED lamp bead and its loop are normal according to the detected frequency of the PWM signal.

If the MCU U5 detects that a second condition is met in the work (one LED lamp bead and a loop thereof are normal, and the other LED lamp bead or the loop thereof has an open circuit fault or the other LED lamp bead has a light attenuation fault), the second alarm K2 is controlled by the 13 th pin and the 30 th pin to output an alarm signal. If the MCU U5 detects that the first condition is not met and the second condition is not met (the two LED lamp beads or the loops of the two LED lamp beads have open circuit faults, or any one LED lamp bead or the loop of the LED lamp bead has short circuit faults, or both the two LED lamp beads have light attenuation faults, or one LED lamp bead has light attenuation faults and the other LED lamp bead or the loop of the LED lamp bead has open circuit faults) in the working process, the 14 th pin and the 19 th pin are used for controlling the power supply control relay K1 to turn off the power supplies of the two LED lamp beads, the current of the whole circuit is minimum, and the first alarm of the main control room gives an alarm because the current is lower than the pull-in current.

In addition, when the MCU U5 is burned or broken down by serious interference, the LED lamp bead cannot work, meanwhile, the power supply circuit cannot be maintained, the primary side current of the transformer U1 is reduced to be below 10mA, the first alarm on the primary side is also triggered to alarm, meanwhile, the second alarm relay of the intelligent lighting unit cannot be driven, the contact automatically falls to an alarm position, and lamp fault alarm is generated. When the MCU U5 works normally, but the circuit of the alarm module is abnormal, the second alarm device generates an alarm because the driving source cannot be obtained.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An intelligent lighting unit of an LED railway signal lamp system is connected with a railway signal lamp bulb containing two LED lamp beads and a first alarm arranged at the front end, and is characterized by comprising a power supply module, a control module, an alarm module, a power supply control module, two constant current driving modules and two fault detection modules, wherein,

2. The intelligent lighting unit according to claim 1, wherein the constant current driving module includes a constant current driving chip, a first switch tube, an inductor, and a current detection resistor, wherein a power supply end of the constant current driving chip is connected to a positive driving power supply end of the power control module, a brightness adjustment end of the constant current driving chip is connected to a corresponding LED control output end of the control module, a driving end of the constant current driving chip is connected to a control end of the first switch tube, a first end of the first switch tube is connected to a negative end of a corresponding LED lamp bead through the inductor, a second end of the first switch tube is grounded through the current detection resistor, and a second end of the first switch tube is further connected to a current detection end of the constant current driving chip.

3. The intelligent lighting unit of claim 2, wherein the fault detection module comprises: the input end of the amplifier is connected with the second end of the first switching tube of the corresponding constant current driving module, the output end of the amplifier is connected with the first input end of the comparator, the second input end of the comparator inputs reference voltage, and the output end of the comparator is connected with the fault detection input end of the control module.

4. The intelligent lighting unit of claim 1, wherein the alarm module comprises a first push-pull circuit and a second alarm, a first input terminal of the first push-pull circuit is connected to a first fault output terminal of the control module, a second input terminal of the first push-pull circuit is connected to a second fault output terminal of the control module, a positive output terminal of the first push-pull circuit is connected to a first terminal of a relay coil of the second alarm, and a negative output terminal of the first push-pull circuit and a second terminal of the relay coil of the second alarm are grounded.

5. 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 a first input terminal of the second push-pull circuit is connected to a third failure output terminal of the control module, a second input terminal of the second push-pull circuit is connected to a fourth failure output terminal of the control module, a positive output terminal of the second push-pull circuit is connected to a first terminal of a coil of the power control relay, a negative output terminal of the second push-pull circuit and a second terminal of the coil of the power control relay are grounded together, a moving contact of a switch of the power control relay is a positive driving power supply terminal, a normally open contact of the switch of the power control relay is connected to a positive electrode of the LED power supply of the power module, and a normally closed contact of the switch of the power control relay is suspended, and when the moving contact is connected with the normally closed contact, the first alarm gives an alarm because the current of the relay coil of the first alarm is lower than the pull-in current.

6. The intelligent lighting unit of claim 1, further comprising:

7. The intelligent lighting unit of claim 6, wherein the indicator module comprises a first LED indicator, a second LED indicator, and a third LED indicator, wherein a positive terminal of the first LED indicator, a positive terminal of the second LED indicator, and a positive terminal of the third LED indicator are respectively connected to a power supply voltage, a negative terminal of the first LED indicator, a negative terminal of the second LED indicator, and a negative terminal of the third LED indicator are respectively connected to corresponding output terminals of the control module, and the first LED indicator lights up when the first LED lamp bead fails, the second LED indicator lights up when the second LED lamp bead fails, and the third LED indicator lights up when the intelligent lighting unit is operating normally.

8. The intelligent lighting unit of claim 1, wherein the power module comprises a transformer, a first rectifier bridge, a second rectifier bridge, and a DC/DC converter, wherein two input terminals of the transformer are connected to an ac power source, an output terminal of the transformer is respectively connected to an input terminal of the first rectifier bridge and an input terminal of the second rectifier bridge, an output terminal of the first rectifier bridge is connected to an input terminal of the DC/DC converter, and an output terminal of the DC/DC converter is a control power supply terminal; and the output end of the second rectifier bridge is a power supply end of the LED.

9. The intelligent lighting unit of claim 1, further comprising:

10. An LED railway signal lamp system is continuous with the first alarm that sets up at the front end, its characterized in that includes:

the railway signal lamp bulb comprises two LED lamp beads;

the intelligent lighting unit of any one of claims 1-9.