LED signal lamp for railway

Abstract

The utility model discloses a railway LED signal light, including by main filament and auxiliary filament constitute's two ways LED light source, be used for accessing ac power connection terminal, be used for converting ac power into direct current voltage and the main filament control circuit of power supply of main filament, be used for converting ac power into direct current voltage and the auxiliary filament control circuit of power supply of auxiliary filament, be used for the current matching load circuit of improving connection terminal input loop current when main filament or auxiliary filament normal work, the input and output of main filament control circuit are connected connection terminal and main filament respectively, the input and output of auxiliary filament control circuit are connected connection terminal and auxiliary filament respectively, current matching load circuit connects with connection terminal, main filament control circuit, auxiliary filament control circuit respectively. The utility model can prolong the life, reduce the replacement frequency of parking maintenance, effectively improve train safe operation and operation efficiency.

Description

Technical Field

[0001] This utility model relates to railway signal lights, and more specifically, to an LED signal light for railway use. Background Technology

[0002] During railway train operation, the lifespan and reliability of signal lights play a crucial role in ensuring safe train operation. In the past, railways used incandescent and halogen lamps as signal lights. Their short lifespan resulted in extremely high replacement frequency, impacting train safety and efficiency. With the increasing efficiency of high-speed rail operations, extending signal light lifespan and reducing replacement frequency are essential methods to improve train safety and operational efficiency. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and propose an LED signal light for railways. Based on a summary of existing railway signal light application specifications, and while maintaining existing on-site installation methods and electrical parameter requirements, this railway signal light, developed using a novel light source, effectively solves the problem of short lifespan of existing light sources. LED signal lights are essential equipment for guiding the safe operation of trains. They can replace existing incandescent and halogen bulbs, extending their service life, reducing the frequency of maintenance and replacement, and effectively improving train safety and operational efficiency.

[0004] The objective of this utility model is achieved through the following technical solution.

[0005] This utility model of an LED signal light for railway includes a dual-channel LED light source consisting of a main filament and an auxiliary filament, a main filament control circuit for connecting to an AC power supply terminal, a main filament control circuit for converting AC power to DC voltage and supplying power to the main filament, an auxiliary filament control circuit for converting AC power to DC voltage and supplying power to the auxiliary filament, and a current matching load circuit for increasing the input circuit current of the terminal when the main filament or the auxiliary filament is working normally.

[0006] The input and output terminals of the main filament control circuit are respectively connected to the terminal block and the main filament, and the input and output terminals of the auxiliary filament control circuit are respectively connected to the terminal block and the auxiliary filament. The current matching load circuit is connected to the terminal block, the main filament control circuit, and the auxiliary filament control circuit.

[0007] Furthermore, the main filament control circuit includes a No. 1 rectifier bridge. The two AC input terminals of the No. 1 rectifier bridge are respectively connected to the main filament input terminal and the common terminal of the wiring terminal via a No. 1 fuse and a No. 1 resistor. A No. 1 fast recovery diode is connected between the two AC input terminals. A No. 1 solid-state electrolytic capacitor is connected between the positive and negative DC output terminals of the No. 1 rectifier bridge. The positive DC output terminal of the No. 1 rectifier bridge is also respectively connected to the negative terminal of a No. 1 Zener diode, the positive voltage input terminal of a No. 1 DC / DC regulator module, and connected via a No. 6 resistor to the No. 1 DC / DC regulator module. The DC regulator module has an input feedback port; the positive terminal of the first Zener diode is connected to the negative DC output terminal of the first rectifier bridge and the gate of the first MOSFET via resistors two and three, respectively. A solid electrolytic capacitor (number two) is connected between the gate and source of the first MOSFET. The gate and source of the first MOSFET are also connected to the first normally open circuit of a dual-channel relay (number two). The source of the first MOSFET is also connected to the negative DC output terminal of the first rectifier bridge. A capacitor (number two) is connected between the filter port and the output port of the first DC / DC regulator module. The positive input terminal and the voltage... A capacitor of type 1 is connected between the negative input terminals, and a resistor of type 5 is connected between the negative input terminals and the output feedback port. The negative input terminal of the first DC / DC regulator module is also connected to the drain of the first MOSFET. The output feedback port of the first DC / DC regulator module is connected via a resistor of type 4 to one end of the first inductor, the positive terminal of the main filament, and the first intermediate terminal of the first dual-channel relay. A capacitor of type 3 is connected in parallel with the fourth resistor. The other end of the first inductor is connected to the output terminal of the first DC / DC regulator module. The negative terminal of the main filament is connected via a current-limiting resistor of type 1. Resistor 18 is connected to the drain of MOSFET 1 and MOSFET 2. The gate of MOSFET 2 is connected to the negative terminal of the main filament via a series connection of Zener diode 2 and resistor 9. The source of MOSFET 2 is connected to the drain of MOSFET 1 and the source of MOSFET 3. The drain of MOSFET 2 is connected to the gate of MOSFET 3 via resistor 8. The drain of MOSFET 3 is connected to the second intermediate terminal of dual-channel relay 1. Diode 3 is connected between the first and second intermediate terminals of dual-channel relay 1.

[0008] Furthermore, the auxiliary filament control circuit includes a second rectifier bridge. The two AC input terminals of the second rectifier bridge are respectively connected to the auxiliary filament input terminal and the common terminal of the terminal block via a second fuse and a seventh resistor. A second fast recovery diode is connected between the two AC input terminals. A third solid-state electrolytic capacitor is connected between the positive and negative DC output terminals of the second rectifier bridge. The positive DC output terminal of the second rectifier bridge is also connected to the negative terminal of a fourth Zener diode, the positive voltage input terminal of the second DC / DC regulator module, and the input feedback port of the second DC / DC regulator module via a twentieth resistor. The positive terminal of Zener diode #4 is connected via resistors #21 and #15 to the negative DC output terminal of rectifier bridge #2 and the gate of MOSFET #4, respectively. A solid electrolytic capacitor #4 is connected between the gate and source of MOSFET #4. The source of MOSFET #4 is also connected to the negative DC output terminal of rectifier bridge #2. A capacitor #5 is connected between the filter port and output port of DC / DC regulator module #2. A capacitor #7 is connected between the positive and negative input terminals. A resistor #19 is connected between the negative input terminal and the output feedback port. The negative input terminal of DC / DC regulator module #2 is also connected to... The output feedback port of the second DC / DC regulator module is connected to the drain of the fourth MOSFET. It is also connected via resistor number 17 to one end of the second inductor, the positive terminal of the auxiliary filament, and the first intermediate terminal of the second dual-channel relay. Resistor number 17 is connected in parallel with capacitor number 6. The other end of the second inductor is connected to the output terminal of the second DC / DC regulator module. The negative terminal of the auxiliary filament is connected to the drain of the fourth MOSFET and the drain of the fifth MOSFET via current-limiting resistor number 2 and resistor number 10. The gate of the fifth MOSFET is connected to the negative terminal of the auxiliary filament via a series connection of Zener diode number 5 and resistor number 11. The source of the fifth MOSFET... The electrodes are respectively connected to the drain of MOSFET 4 and the source of MOSFET 6. The drain of MOSFET 5 is connected to the gate of MOSFET 6 via resistor 12. The drain of MOSFET 6 is connected to the second intermediate terminal of dual-channel relay 2. A diode 6 is connected between the first and second intermediate terminals of dual-channel relay 2. The gate of MOSFET 5 is also connected to the gate of MOSFET 7 via resistor 13. The source of MOSFET 7 is connected to the source of MOSFET 6. The drain of MOSFET 7 is connected to the negative input port of the first coil of dual-coil secondary holding relay.The positive input port of the first coil of the dual-coil secondary holding relay is connected to the middle terminal of the first path of the second dual-path relay. The normally open first path of the dual-coil secondary holding relay is connected to the gate and source of the first field-effect transistor. The normally open second path of the dual-coil secondary holding relay is connected to the gate and source of the fourth field-effect transistor. The negative input port of the second coil of the dual-coil secondary holding relay is also connected to the common terminal of the terminal block via resistor number 7. The positive input port of the second coil of the dual-coil secondary holding relay is connected to the auxiliary filament input terminal of the terminal block via resistor number 14 and diode number 7 in series, and then via fuse number 2. Resistor number 14 is connected in parallel with capacitor number 4.

[0009] Furthermore, the current matching load circuit includes a No. 3 fast recovery diode. One end of the No. 3 fast recovery diode is connected to the common terminal of the terminal block, and the other end of the No. 3 fast recovery diode is connected to the first normally open circuit of the No. 1 dual-channel relay and the first normally open circuit of the No. 2 dual-channel relay. The first normally open circuit of the No. 1 dual-channel relay is connected to the main filament input terminal of the terminal block via a No. 3 fuse, and the first normally open circuit of the No. 2 dual-channel relay is connected to the auxiliary filament input terminal of the terminal block via a No. 4 fuse. The No. 3 fast recovery diode is connected in parallel with a No. 16 resistor and a load capacitor.

[0010] Furthermore, it also includes a housing, the bottom of which is provided with a dual-filament lamp holder for integrating wiring terminals, the interior of which is provided with dual LED light sources and a control circuit board for integrating main filament control circuit and auxiliary filament control circuit, the front end of which is provided with a front heat sink, the middle of which is provided with a through hole for the light from the dual LED light sources to pass through, and the inner wall of the front heat sink is provided with a current matching load board for integrating current matching load circuit.

[0011] Furthermore, the outer casing is integrally formed by die casting of aluminum alloy, and the control circuit board and current matching load board are both made of aluminum substrate.

[0012] Compared with the prior art, the beneficial effects of the technical solution of this utility model are:

[0013] (1) In this utility model, the main filament control circuit and the auxiliary filament control circuit adopt a dual-path independent control form to realize the independent control of the main filament and the auxiliary filament. The light source adopts a dual-path LED light source (both the main filament and the auxiliary filament adopt light-emitting diode modules) and a current matching load circuit.

[0014] (2) The installation of this utility model adopts an insert-type lamp socket structure with a standard interface, which is convenient to replace with existing bulbs and can be matched with existing field equipment, making installation convenient.

[0015] (3) The heat dissipation of this utility model adopts an aluminum die-cast shell for heat dissipation. The design concept of integrated die-cast molding is compact, lightweight, and convenient for on-site use and operation. The control circuit board and current matching load board are made of aluminum substrate and mounted on the aluminum shell, which effectively solves the problem of heat generated by the circuit operation and damage to electronic components, ensures long-term operation of the circuit, and greatly improves the service life.

[0016] (4) This utility model adopts a high-power discrete component (such as rectifier, field effect transistor, DC / DC voltage regulator module, etc.) structure, which has strong anti-interference ability and effectively reduces power loss due to the use of capacitive load.

[0017] (5) This utility model uses a double coil secondary holding relay to realize the main and auxiliary filament fault protection, so that the power supply current is zero after the fault protection, which effectively ensures the reliable drop of the power supply current relay of the external terminal block.

[0018] (6) The present invention also includes a reset circuit. When the main / auxiliary filament fault protection is tested manually, the main / auxiliary filament can be automatically restored to normal operation when the terminal is powered on again. Attached Figure Description

[0019] Figure 1 This is a side sectional view of the installation structure of the LED signal light for railway of this utility model.

[0020] Figure 2 This is a front view of the installation structure of the railway LED signal light of this utility model.

[0021] Figure 3 This is a block diagram of the LED signal light for railways according to this utility model.

[0022] Figure 4 This is the circuit diagram of the LED signal light for railways according to this utility model.

[0023] Attached label: 1-Dual filament lamp holder, 2-Housing, 3-Control circuit board, 4-Current matching load board, 5-Front heat sink, 6-Dual LED light source; DZ1-Terminal block, BX1-Fuse No. 1, BX2-Fuse No. 2, RD1-Fuse No. 3, RD2-Fuse No. 4, TVS1-Fast Return Diode No. 1, TVS2-Fast Return Diode No. 2, TVS3-Fast Return Diode No. 3, B1-Rectifier Bridge No. 1, B2-Rectifier Bridge No. 2, D1-Zenith Diode No. 1, D2-Zenith Diode No. 2, D D1 - Diode #3, D4 - Zener diode #4, D5 - Zener diode #5, D6 - Diode #6, D7 - Diode #7, R1 - Resistor #1, R2 - Resistor #2, R3 - Resistor #3, R4 - Resistor #4, R5 - Resistor #5, R6 - Resistor #6, R7 - Resistor #7, R8 - Resistor #8, R9 - Resistor #9, R10 - Resistor #10, R11 - Resistor #11, R12 - Resistor #12, R13 - Resistor #13, R14 - Resistor #14, R15 - Resistor #15, R16 - Resistor #10 Resistor #6, R17, R18, R19, R20, R21, E1 (solid-state electrolytic capacitor #1), E2 (solid-state electrolytic capacitor #2), E3 (solid-state electrolytic capacitor #3), E4 (solid-state electrolytic capacitor #4), IC1 (DC / DC regulator module #1), IC2 (DC / DC regulator module #2), N1 (MOSFET #1), N2 (MOSFET #2), N3 (MOSFET #3), N4 (MOSFET #4), N5 (MOSFET #5) N6 - MOSFET #6, N7 - MOSFET #7, C1 - Capacitor #1, C2 - Capacitor #2, C3 - Capacitor #3, C4 - Capacitor #4, C5 - Capacitor #5, C6 - Capacitor #6, C7 - Capacitor #7, C - Load capacitor, L1 - Inductor #1, L2 - Inductor #2, LED1 - Main filament, LED2 - Auxiliary filament, J1 - Dual-channel relay #1, J2 - Dual-channel relay #2, RL1 - Current-limiting resistor #1, RL2 - Current-limiting resistor #2, CB1 - Dual-coil holding relay. Detailed Implementation

[0024] The present invention will now be further described with reference to the accompanying drawings.

[0025] This utility model proposes an LED signal light for railway use, such as... Figure 1 and Figure 2The structural diagram shown mainly includes a dual-filament lamp holder 1, a housing 2, a control circuit board 3, a current matching load board 4, a front heat sink 5, and dual-channel LED light sources 6. The housing 2 can be integrally formed by die-casting aluminum alloy. The dual-filament lamp holder 1 can adopt an insert-type lamp holder structure. Both the control circuit board 3 and the current matching load board 4 can be made of aluminum substrate. The dual-filament lamp holder 1 is installed at the bottom of the housing 2. The dual-channel LED light sources 6 and the control circuit board are respectively attached to the inside of the housing 2 and can be secured with screws. The front heat sink 5 is installed on the front end of the housing, with a through hole in the middle for the light from the dual-channel LED light sources 6 to pass through. The current matching load board 4 is attached to the inner wall of the front heat sink 5 and can be secured with bolts. When the control circuit board 3, the current matching load board 4, and the dual-channel LED light sources 6 are working, the heat generated can be dissipated through the housing 2 and the front heat sink 5.

[0026] The dual-filament lamp holder 1 is used to integrate the terminal block DZ1. The control circuit board 3 is used to integrate the main filament control circuit and the auxiliary filament control circuit. The current matching load board 4 is used to integrate the current matching load circuit. The dual-channel LED light source consists of a main filament LED1 and an auxiliary filament LED2, both of which can be LED modules. The terminal block DZ1 is used to connect to an AC power supply. The main filament control circuit converts the AC power supply connected to the terminal block DZ1 into a constant DC voltage to maintain the stable operation of the main filament LED1. The auxiliary filament control circuit converts the AC power supply connected to the terminal block DZ1 into a constant DC voltage to maintain the stable operation of the auxiliary filament LED2. The current matching load circuit increases the input circuit current of the terminal block DZ1 when either the main filament LED1 or the auxiliary filament LED2 is working normally. The circuit connections are as follows: Figure 3 As shown, the input and output terminals of the main filament control circuit are connected to the terminal block and the main filament, respectively. The input and output terminals of the auxiliary filament control circuit are connected to the terminal block and the auxiliary filament, respectively. The current matching load circuit is connected to the terminal block, the main filament control circuit, and the auxiliary filament control circuit, respectively.

[0027] like Figure 4As shown, the main filament control circuit includes a first rectifier bridge B1. The two AC input terminals ("1" and "3") of the first rectifier bridge B1 are connected to the main filament input terminal "Z" and the common terminal "G" of the terminal block DZ1 via a first fuse BX1 and a first resistor R1, respectively. A first fast recovery diode TVS1 is connected between the two AC input terminals ("1" and "3"). A first solid-state electrolytic capacitor E1 is connected between the DC output positive terminal "2" and the DC output negative terminal "4" of the first rectifier bridge B1. The DC output positive terminal "2" of the first rectifier bridge B1 is also connected to the negative terminal of the first Zener diode D1, the voltage input positive terminal "2" of the first DC / DC voltage regulator module IC1, and the input feedback port "7" of the first DC / DC voltage regulator module IC1 via a sixth resistor R6. The positive terminal of Zener diode D1 is connected to the negative DC output terminal "4" of rectifier bridge B1 and the gate "1" of MOSFET N1 via resistors R2 and R3. A solid electrolytic capacitor E2 is connected between the gate "1" and the source "3" of MOSFET N1. The gate and source of MOSFET N1 are also connected to the first normally open J2-1 of dual-channel relay J2 (i.e., the normally open contacts "5" and "4" of dual-channel relay J2). The source "3" of MOSFET N1 is also connected to the negative DC output terminal "4" of rectifier bridge B1.A capacitor C2 is connected between the filter port "1" and the output port "3" of the first DC / DC voltage regulator module IC1. A capacitor C1 is also connected between the positive input terminal "2" and the negative input terminal "4". A resistor R5 is connected between the negative input terminal "4" and the output feedback port "5". The negative input terminal "4" of the first DC / DC voltage regulator module IC1 is also connected to the drain "2" of the first field-effect transistor N1. The output feedback port "5" of the first DC / DC voltage regulator module IC1 is also connected via a resistor R4 to one end of the first inductor L1, the positive terminal of the main filament LED1, and the first intermediate terminal "7" of the first dual-channel relay J1. A capacitor C3 is connected in parallel with the resistor R4. The other end of the first inductor L1 is connected to the first DC / DC voltage regulator module. The output terminal "3" of IC1 is connected to the negative terminal of the main filament LED1 via current-limiting resistor RL1 and resistor R18, which are connected to the drain "2" of MOSFET N1 and the drain of MOSFET N2. The gate of MOSFET N2 is connected to the negative terminal of the main filament LED1 via Zener diode D2 and resistor R9. The source of MOSFET N2 is connected to the drain of MOSFET N1 and the source of MOSFET N3. The drain of MOSFET N2 is connected to the gate of MOSFET N3 via resistor R8. The drain of MOSFET N3 is connected to the second intermediate terminal "8" of dual-channel relay J1. A diode D3 is connected between the first intermediate terminal "7" and the second intermediate terminal "8" of dual-channel relay J1. Preferably, capacitors C1, C2, and C3 can all be coupling capacitors.

[0028] The auxiliary filament control circuit includes a second rectifier bridge B2. The two AC input terminals ("1" and "3") of the second rectifier bridge B2 are connected to the auxiliary filament input terminal "F" and the common terminal "G" of the terminal block DZ1 via a second fuse BX2 and a seventh resistor R7, respectively. A second fast recovery diode TVS2 is connected between the two AC input terminals ("1" and "3"). A third solid-state electrolytic capacitor E3 is connected between the DC output positive terminal "2" and the DC output negative terminal "4" of the second rectifier bridge B2. The DC output positive terminal "2" of the second rectifier bridge B2 is also connected to the negative terminal of the fourth Zener diode D4, the voltage input positive terminal "2" of the second DC / DC voltage regulator module IC2, and the input feedback port "7" of the second DC / DC voltage regulator module IC2 via a twentieth resistor R20. The positive terminal of Zener diode D1 is connected to the negative DC output terminal "4" of rectifier bridge B2 and the gate "1" of MOSFET N4 via resistors R21 and R15, respectively. A solid electrolytic capacitor E4 is connected between the gate "1" and the source "3" of MOSFET N4. The source "3" of MOSFET N4 is also connected to the negative DC output terminal "4" of rectifier bridge B2. A capacitor C5 (number 5) is connected between the filter port "1" and the output port "3" of the second DC / DC voltage regulator module IC2. A capacitor C7 (number 7) is connected between the positive input terminal "2" and the negative input terminal "4". A resistor R19 (number 19) is connected between the negative input terminal "4" and the output feedback port "5". The negative input terminal "4" of the second DC / DC voltage regulator module IC2 is also connected to the drain "2" of the fourth MOSFET N4. The output feedback port "5" of the second DC / DC voltage regulator module IC2 is also connected via a resistor R17 to one end of the second inductor L2, the positive terminal of the auxiliary filament LED2, and the first intermediate terminal "7" of the second dual-channel relay J2. A capacitor C6 (number 6) is connected in parallel with the resistor R17. The other end of the second inductor L2 is connected to the second DC / DC voltage regulator module IC2. The output terminal "3" of the voltage module IC2 is connected to the negative terminal of the auxiliary filament LED2 via the current limiting resistor RL2 and the resistor R10, respectively, to the drain "2" of the fourth field-effect transistor N4 and the drain of the fifth field-effect transistor N5. The gate of the fifth field-effect transistor N5 is connected to the negative terminal of the auxiliary filament LED2 via the series voltage regulator D5 and the resistor R11. The source of the fifth field-effect transistor N5 is connected to the drain of the fourth field-effect transistor N4 and the source of the sixth field-effect transistor N6, respectively. The drain of the fifth field-effect transistor N5 is connected to the gate of the sixth field-effect transistor N6 via the resistor R12. The drain of the sixth field-effect transistor N6 is connected to the second intermediate terminal "8" of the second dual-channel relay J2. A diode D6 is connected between the first intermediate terminal "7" and the second intermediate terminal "8" of the second dual-channel relay J2.The gate of the fifth field-effect transistor N5 is also connected to the gate of the seventh field-effect transistor N7 via resistor R13. The source of the seventh field-effect transistor N7 is connected to the source of the sixth field-effect transistor N6. The drain of the seventh field-effect transistor N7 is connected to the negative input port "5" of the first coil of the dual-coil secondary holding relay CB1. The first coil input positive port "1" of the dual-coil secondary holding relay CB1 is connected to the first intermediate terminal "7" of the second dual-channel relay J2; the first normally open ("2" and "3") of the dual-coil secondary holding relay CB1 is connected to the first field-effect transistor N1, specifically, the normally open pin "2" of the first normally open pin is connected to the gate (pin "1") of the first field-effect transistor N1, and the common pin "3" of the first normally open pin is connected to the source (pin "3") of the first field-effect transistor N1; the second normally open ("7" and "8") of the dual-coil secondary holding relay CB1 is connected to the fourth field-effect transistor N4, specifically, the normally open pin "7" of the second normally open pin is connected to the gate (pin "1") of the fourth field-effect transistor N4, and the common pin "8" of the second normally open pin is connected to the fourth field-effect transistor N4. The circuit is connected to the source (pin "3") of the fourth field-effect transistor N4; the negative input port "6" of the second coil of the dual-coil secondary holding relay CB1 is also connected to the common terminal "G" of the terminal DZ1 via resistor R7. The positive input port "10" of the second coil of the dual-coil secondary holding relay CB1 is connected to the auxiliary filament input terminal "F" of the terminal DZ1 via resistor R14 and diode D7 in series, and then via fuse BX2. Resistor R14 is connected in parallel with capacitor C4. Preferably, capacitors C5, C6, and C7 can all be coupling capacitors.

[0029] The current matching load circuit includes a No. 3 fast recovery diode VS3. One end of the No. 3 fast recovery diode VS3 is connected to the common terminal "G" of the terminal block DZ1, and the other end of the No. 3 fast recovery diode VS3 is connected to the first normally open "J1-1" of the first dual-channel relay J1 and the first normally open "J2-1" of the second dual-channel relay J2. The first normally open "J1-1" of the first dual-channel relay J1 is connected to the main circuit of the terminal block DZ1 via the No. 3 fuse RD1. Specifically, in the dual-channel relay J1, the common pin "1" of the first normally open "J1-1" is connected to the third fast-return diode VS3, and the normally open pin "2" is connected to the main filament input terminal "Z" of terminal DZ1 via fuse RD1. In the dual-channel relay J2, the first normally open "J2-1" is connected to the auxiliary filament input terminal "F" of terminal DZ1 via fuse RD2. Specifically, the common pin "1" of the first normally open "J2-1" of the dual-channel relay J2 is connected to the third fast-return diode VS3, and the normally open pin "2" is connected to the auxiliary filament input terminal "F" of terminal DZ1 via fuse RD2. The third fast-return diode VS3 is connected in parallel with a 16-pin resistor R16 and a load capacitor C, and the 16-pin resistor R16 and the load capacitor C are connected in parallel. Preferably, the current matching load C can be an automotive-grade magnetic film capacitor to improve the power factor, save energy, and reduce heat generation.

[0030] In the aforementioned main filament control circuit, the fast recovery diode TVS1 and resistor R1 constitute the electromagnetic interference absorption circuit of the main filament; the Zener diode D1 and resistor R2 constitute the threshold circuit of the main filament; the rectifier bridge B1 and solid electrolytic capacitor E1 constitute the rectifier and filter circuit of the main filament; the current limiting resistor RL1 constitutes the current limiting circuit of the main filament; resistor R9, Zener diode D2, and MOSFET N2 constitute the short-circuit protection circuit of the main filament; capacitor C1, capacitor C2, capacitor C3, resistor R4, resistor R5, resistor R6, inductor L1, and DC / DC regulator IC1 constitute the DC / DC regulator circuit of the main filament; and resistor R8, resistor R18, MOSFET N3, and diode D3 constitute the relay drive circuit of the main filament. Resistor R3, MOSFET N1, and solid electrolytic capacitor E2 constitute the electronic switch circuit for the main filament. Resistor R3 and solid electrolytic capacitor E2 can be used as an integrating circuit, and MOSFET N1 can be used as an electronic switch. When the main filament LED1 fails, this electronic switch circuit will turn off the power supply to the main filament LED1.

[0031] In the aforementioned auxiliary filament control circuit, the fast recovery diode TVS2 (No. 2) and resistor R7 (No. 7) constitute the electromagnetic interference absorption circuit for the auxiliary filament; the Zener diode D4 (No. 4) and resistor R21 (No. 21) constitute the threshold circuit for the auxiliary filament; the rectifier bridge B2 (No. 2) and solid-state electrolytic capacitor E3 (No. 3) constitute the rectifier and filter circuit for the auxiliary filament; the current-limiting resistor RL2 (No. 2) constitutes the current-limiting circuit for the auxiliary filament; and resistors R11 (No. 11), R13 (No. 13), Zener diode D5 (No. 5), and MOSFET (No. 5) constitute the threshold circuit for the auxiliary filament. The short-circuit protection circuit for the auxiliary filament consists of transistor N5 and MOSFET N7. The DC / DC voltage regulator circuit for the auxiliary filament consists of capacitors C5, C6, C7, R17, R19, R20, inductor L2, and DC / DC voltage regulator IC2. The relay drive circuit for the auxiliary filament consists of resistors R10 and R12, MOSFET N6, and diode D6. The electronic switch circuit for the auxiliary filament consists of resistor R15, MOSFET N4, and solid-state electrolytic capacitor E4. Resistor R15 and solid-state electrolytic capacitor E4 can function as an integrating circuit, and MOSFET N4 can function as an electronic switch. When the auxiliary filament LED2 fails, this electronic switch circuit will cut off the power supply to LED2. The reset circuit of the entire control circuit board consists of diode D7 (number 7), capacitor C4 (number 4), resistor R14 (number 14), and double-coil secondary holding relay CB1.

[0032] This invention employs a dual-channel LED light source with a cold-standby auxiliary filament drive. When the main filament LED1 is working normally, the auxiliary filament LED2 is in a cold standby state. When the main filament LED1 fails, the auxiliary filament LED2 is automatically turned on. When both the main filament LED1 and the auxiliary filament LED2 fail, both are de-energized, achieving fault-guided safety. The main filament LED1 and the auxiliary filament LED2 are powered by an external current relay at the front end of terminal DZ1. When the main filament LED1 is working (pins "2" and "3" of terminal DZ1 are energized), the auxiliary filament LED2 is de-energized (when the main filament LED1 is working, the normally closed contact of the external current relay at the front end of terminal DZ1 becomes normally open, de-energizing the auxiliary filament LED2). When the main filament LED1 fails, the external current relay at the front end of terminal DZ1 drops (at this time, the normally closed contact changes from normally open to normally closed again), and the auxiliary filament LED2 is energized (pins "1" and "2" of terminal DZ1 are energized).

[0033] Working principle of main filament LED1: Main filament LED1 is powered by AC through terminals DZ1 (pins "2" and "3"). An electromagnetic interference absorption circuit (i.e., fast recovery diode TVS1 and resistor R1) filters interference signals. The AC input is converted to DC by a rectifier-filter circuit (i.e., rectifier bridge B1 and solid-state electrolytic capacitor E1). When this DC voltage exceeds the threshold voltage of Zener diode D1, an integrating circuit (i.e., resistor R3 and solid-state electrolytic capacitor E2) provides the operating voltage to the electronic switch (i.e., MOSFET N1). The voltage is then regulated by a DC / DC regulator circuit (i.e., capacitors C1, C2, C3, R4, R5, R6, L1, and IC1) to power the main filament LED1. The system provides a constant voltage. The main filament LED1 is a light-emitting filament. The main filament LED1 is kept stable by the current-limiting resistor RL1. At this time, the voltage of the current-limiting resistor RL1 drives the relay driving circuit (i.e., resistor R8, resistor R18, MOSFET N3, and diode D3) to drive the dual-channel relay J1 (i.e., contacts "1" and "2" of the dual-channel relay J1 change from normally open to normally closed to supply power) to supply power to the current matching load circuit. When the voltage of the current-limiting resistor RL1 exceeds the limit, the short-circuit protection circuit (i.e., resistor R9, Zener diode D2, and MOSFET N2) causes MOSFET N2 to saturate and conduct, and the dual-channel relay J1 drops (i.e., contacts "1" and "2" of the dual-channel relay J1 change from normally closed to normally open to de-energize), and automatically switches to the auxiliary filament control circuit.

[0034] The working principle of the auxiliary filament LED2: The auxiliary filament LED2 is powered by AC through terminal DZ1 (pins "1" and "2"). Interference signals are filtered by the electromagnetic interference absorption circuit (i.e., fast recovery diode TVS2 and resistor R7). The AC input is converted to DC by the rectifier and filter circuit (i.e., rectifier bridge B2 and solid-state electrolytic capacitor E3). When this DC voltage exceeds the threshold voltage of Zener diode D4, it provides the operating voltage to the electronic switch (i.e., MOSFET N4) via the integrating circuit (i.e., resistor R15 and solid-state electrolytic capacitor E4). Finally, the voltage is regulated by the DC / DC regulator circuit (i.e., voltage regulator D4). Capacitors C5, C6, C7, R17, R19, R20, L2, and IC2 (DC / DC voltage regulator module) provide a constant voltage for the auxiliary filament LED2. The auxiliary filament LED2 is a light-emitting filament, and its stable operation is maintained by the current-limiting resistor RL2. The voltage across RL2 is then transmitted through the relay drive circuit (resistors R10, R12, and MOSFET). The circuit, powered by diodes N6 and D6, drives dual-channel relay J2 (meaning contacts "1" and "2" of relay J2 change from normally open to normally closed to supply power). When the voltage across current-limiting resistor RL2 exceeds the limit, the short-circuit protection circuit (resistor R11, Zener diode D5, and MOSFET N5) causes MOSFET N5 to saturate and conduct, deactivating dual-channel relay J2 (meaning contacts "1" and "2" of relay J2 change from normally closed to normally open to deactivate power). Simultaneously, through resistor R13 and MOSFET N7, the magnetically latched double-coil secondary latching relay CB1 is reversed. The normally open contacts 2 and 3, and 7 and 8 of the double-coil secondary latching relay CB1 are changed from normally open to normally closed. Contacts 2 and 3 of the double-coil secondary latching relay CB1 are connected in parallel to pins 1 and 3 of MOSFET N1, and contacts 7 and 8 of the double-coil secondary latching relay CB1 are connected in parallel to pins 1 and 3 of MOSFET N4, thereby turning off the main and auxiliary filament electronic switches and ensuring that the main and auxiliary filaments are reliably extinguished.

[0035] To ensure that the lamp will not re-ignite in the event of a main filament failure, an interlocking mechanism (i.e., a double-coil secondary holding relay CB1) is added to the auxiliary filament control circuit. Its function is as follows:

[0036] (1) When the auxiliary filament LED2 is working, the second normally open contact of the second dual-channel relay J2 (i.e., the normally open contacts "4" and "5" of the second dual-channel relay J2) locks the electronic switch of the main filament (i.e., the first field-effect transistor N1), so that the first field-effect transistor N1 is in the off state, so as to keep the auxiliary filament LED2 working normally.

[0037] (2) When the voltage value of the second current limiting resistor RL2 exceeds the limit when the auxiliary filament LED2 is working, the short circuit protection circuit (i.e., resistor R11, resistor R13, Zener diode D5, MOSFET N5, and MOSFET N7) drives the double coil holding relay CB1 to operate, and short-circuit the gate and source of the electronic switch of the main filament LED1 (i.e., MOSFET N1) through its first normally open contact (i.e., “2” and “3”), turning off the power supply of the main filament LED1. And short-circuit the gate and source of the electronic switch of the auxiliary filament LED2 (i.e., MOSFET N4) through its second normally open contact (“7” and “8”), turning off the power supply of the auxiliary filament LED2, thus realizing dual filament fault protection.

[0038] In addition, a reset circuit (i.e., diode D7, capacitor C4, resistor R14, and double coil secondary holding relay CB1) is added to the auxiliary filament control circuit. When the main / auxiliary filament fault protection is manually tested, the main / auxiliary filament can be automatically restored to normal operation when the secondary power is supplied to the terminal DZ1 through this circuit.

[0039] Although the functions and working processes of this utility model have been described above in conjunction with the accompanying drawings, this utility model is not limited to the specific functions and working processes described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this utility model without departing from the spirit and scope of the claims, and all of these are within the protection scope of this utility model.

Claims

1. A railway LED signal light, characterized in that, It includes a dual-channel LED light source consisting of a main filament (LED1) and an auxiliary filament (LED2), an AC power supply terminal (DZ1), a main filament control circuit for converting AC power to DC voltage and supplying power to the main filament (LED1), an auxiliary filament control circuit for converting AC power to DC voltage and supplying power to the auxiliary filament (LED2), and a current matching load circuit for increasing the input circuit current of the terminal (DZ1) when the main filament (LED1) or the auxiliary filament (LED2) is working normally. The input and output terminals of the main filament control circuit are respectively connected to the terminal block (DZ1) and the main filament (LED1), and the input and output terminals of the auxiliary filament control circuit are respectively connected to the terminal block (DZ1) and the auxiliary filament (LED2). The current matching load circuit is connected to the terminal block (DZ1), the main filament control circuit, and the auxiliary filament control circuit.

2. The railway LED signal light according to claim 1, characterized in that, The main filament control circuit includes a first rectifier bridge (B1). The two AC input terminals of the first rectifier bridge (B1) are connected to the main filament input terminal and the common terminal of the terminal block (DZ1) via a first fuse (BX1) and a first resistor (R1), respectively. A first fast recovery diode (TVS1) is connected between the two AC input terminals. A first solid-state electrolytic capacitor (E1) is connected between the positive and negative DC output terminals of the first rectifier bridge (B1). The positive DC output terminal of the first rectifier bridge (B1) is also connected to the negative terminal of a first Zener diode (D1) and the positive voltage input of a first DC / DC regulator module (IC1). The positive terminal of the voltage regulator (D1) is connected to the input feedback port of the DC / DC regulator module (IC1) via resistor R6. The positive terminal of the voltage regulator (D1) is connected to the negative DC output terminal of the rectifier bridge (B1) and the gate of the field-effect transistor (N1) via resistors R2 and R3, respectively. A solid electrolytic capacitor (E2) is connected between the gate and source of the field-effect transistor (N1). The gate and source of the field-effect transistor (N1) are also connected to the first normally open circuit of the dual-channel relay (J2). The source of the field-effect transistor (N1) is also connected to the negative DC output terminal of the rectifier bridge (B1).A capacitor (C2) is connected between the filter port and the output port of the first DC / DC regulator module (IC1). A capacitor (C1) is connected between the positive and negative input terminals. A resistor (R5) is connected between the negative input terminal and the output feedback port. The negative input terminal of the first DC / DC regulator module (IC1) is also connected to the drain of the first field-effect transistor (N1). The output feedback port of the first DC / DC regulator module (IC1) is connected via a resistor (R4) to one end of the first inductor (L1), the positive terminal of the main filament (LED1), and the first intermediate terminal of the first dual-channel relay (J1). A capacitor (C3) is connected in parallel with the resistor (R4). The other end of the first inductor (L1) is connected to the output terminal of the first DC / DC regulator module (IC1). The negative terminal of the main filament (LED1) is connected to the drain of the first field-effect transistor (N1) and the drain of the second field-effect transistor (N2) via a current-limiting resistor (RL1) and a resistor (R18). The gate of the second field-effect transistor (N2) is connected to the negative terminal of the main filament (LED1) via a series connection of a Zener diode (D2) and a resistor (R9). The source of the second field-effect transistor (N2) is connected to the drain of the first field-effect transistor (N1) and the source of the third field-effect transistor (N3). The drain of the second field-effect transistor (N2) is connected to the gate of the third field-effect transistor (N3) via a resistor (R8). The drain of the third field-effect transistor (N3) is connected to the second intermediate terminal of a dual-channel relay (J1). A diode (D3) is connected between the first and second intermediate terminals of the dual-channel relay (J1).

3. The railway LED signal light according to claim 1, characterized in that, The auxiliary filament control circuit includes a second rectifier bridge (B2). The two AC input terminals of the second rectifier bridge (B2) are connected to the auxiliary filament input terminal and the common terminal of the terminal block (DZ1) via a fuse (BX2) and a resistor (R7), respectively. A fast recovery diode (TVS2) is connected between the two AC input terminals. A solid-state electrolytic capacitor (E3) is connected between the positive and negative DC output terminals of the second rectifier bridge (B2). The positive DC output terminal of the second rectifier bridge (B2) is also connected to the negative terminal of a Zener diode (D4), the positive voltage input terminal of the second DC / DC regulator module (IC2), and is connected to the second DC / DC regulator module via a resistor (R20). The input feedback port of the IC2 module; the positive terminal of the fourth Zener diode (D4) is connected to the negative DC output terminal of the second rectifier bridge (B2) and the gate of the fourth MOSFET (N4) via resistors 21 (R21) and 15 (R15), respectively. A solid electrolytic capacitor (E4) is connected between the gate and source of the fourth MOSFET (N4), and the source of the fourth MOSFET (N4) is also connected to the negative DC output terminal of the second rectifier bridge (B2); a capacitor (C5) is connected between the filter port and the output port of the second DC / DC regulator module (IC2), a capacitor (C7) is connected between the positive and negative voltage input terminals, and a capacitor is connected between the negative voltage input terminal and the output feedback port. Resistor 19 (R19) is connected to the negative input terminal of the second DC / DC regulator module (IC2), which is also connected to the drain of the fourth MOSFET (N4). The output feedback port of the second DC / DC regulator module (IC2) is connected via resistor 17 (R17) to one end of the second inductor (L2), the positive terminal of the auxiliary filament (LED2), and the first intermediate terminal of the second dual-channel relay (J2). Resistor 17 (R17) is connected in parallel with capacitor 6 (C6). The other end of the second inductor (L2) is connected to the output terminal of the second DC / DC regulator module (IC2). The negative terminal of the auxiliary filament (LED2) is connected via current-limiting resistor 2 (RL2) and resistor 10 (R10) to the fourth MOSFET. The drain of transistor (N4) and the drain of MOSFET (N5) are connected together. The gate of MOSFET (N5) is connected to the negative terminal of the auxiliary filament (LED2) via a series connection of Zener diode (D5) and resistor (R11). The source of MOSFET (N5) is connected to the drain of MOSFET (N4) and the source of MOSFET (N6). The drain of MOSFET (N5) is connected to the gate of MOSFET (N6) via resistor (R12). The drain of MOSFET (N6) is connected to the second intermediate terminal of dual-channel relay (J2). A diode (D6) is connected between the first and second intermediate terminals of dual-channel relay (J2).The gate of the fifth field-effect transistor (N5) is connected to the gate of the seventh field-effect transistor (N7) via resistor thirteen (R13). The source of the seventh field-effect transistor (N7) is connected to the source of the sixth field-effect transistor (N6). The drain of the seventh field-effect transistor (N7) is connected to the negative input port of the first coil of the dual-coil secondary holding relay (CB1). The positive input port of the first coil of the dual-coil secondary holding relay (CB1) is connected to the first intermediate terminal of the second dual-channel relay (J2). The normally open first channel of the dual-coil secondary holding relay (CB1) is connected to the gate and source of the first field-effect transistor (N1). The second normally open circuit of the dual-coil secondary holding relay (CB1) is connected to the gate and source of the fourth field-effect transistor (N4). The negative input port of the second coil of the dual-coil secondary holding relay (CB1) is also connected to the common terminal of the terminal block (DZ1) via resistor No. 7 (R7). The positive input port of the second coil of the dual-coil secondary holding relay (CB1) is connected to the auxiliary filament input terminal of the terminal block (DZ1) via resistor No. 14 (R14) and diode No. 7 (D7) in series, and then via fuse No. 2 (BX2). Resistor No. 14 (R14) is connected in parallel with capacitor No. 4 (C4).

4. The railway LED signal light according to claim 1, characterized in that, The current matching load circuit includes a No. 3 fast recovery diode (VS3). One end of the No. 3 fast recovery diode (VS3) is connected to the common terminal of the terminal block (DZ1). The other end of the No. 3 fast recovery diode (VS3) is connected to the first normally open circuit of the No. 1 dual-channel relay (J1) and the first normally open circuit of the No. 2 dual-channel relay (J2). The first normally open circuit of the No. 1 dual-channel relay (J1) is connected to the main filament input terminal of the terminal block (DZ1) via the No. 3 fuse (RD1). The first normally open circuit of the No. 2 dual-channel relay (J2) is connected to the auxiliary filament input terminal of the terminal block (DZ1) via the No. 4 fuse (RD2). The No. 3 fast recovery diode (VS3) is connected in parallel with a No. 16 resistor (R16) and a load capacitor (C).

5. The railway LED signal light according to claim 1, characterized in that, It also includes a housing (2), the bottom of which is provided with a dual-filament lamp port (1) for integrating the terminal block (DZ1), the inside of which is provided with a dual-channel LED light source (6) and a control circuit board (3) for integrating the main filament control circuit and the auxiliary filament control circuit, the front end of which is provided with a front heat sink (5), the middle of which is provided with a through hole for the light from the dual-channel LED light source (6) to pass through, and the inner wall of which is provided with a current matching load board (4) for integrating the current matching load circuit.

6. The railway LED signal light according to claim 5, characterized in that, The outer shell (2) is integrally formed by die casting of aluminum alloy, and the control circuit board (3) and the current matching load board (4) are both made of aluminum substrate.

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