Subway vehicle LED lighting system and control method thereof

Abstract

The invention discloses a subway vehicle LED lighting system and a control method thereof, and relates to the technical field of lighting control. The system comprises an input module, a direct current-direct current conversion module and an output control module, the input module is connected with the direct current-direct current conversion module, and the direct current-direct current conversion module is further connected with the output control module; the input module is used for accessing an alternating current signal and a direct current signal, the output control module is used for driving and output control of the direct current-direct current conversion module, and the direct current-direct current conversion module is used for performing voltage conversion processing on the input signal according to a control signal of the output control module and outputting a voltage value required by the LED illuminating lamp. And the LED illumination control of the subway vehicle is realized. According to the invention, a 220V alternating current signal and a 110V direct current signal can be compatible, and the lighting control convenience and the lighting effect are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lighting control, and in particular to a subway vehicle LED lighting system and a control method thereof. Background Art

[0002] At present, LED lighting is widely used in subway vehicles, and the quality of subway vehicle lighting systems is directly related to the overall feelings and experience of passengers during subway travel.

[0003] LED has significant advantages over traditional lighting. Traditional lighting has high energy consumption, while LED has excellent energy-saving characteristics, which can significantly reduce the power consumption of vehicle lighting and contribute to energy conservation and emission reduction in the subway. In terms of service life, LED can work stably for a long time, reducing the workload of maintenance and the impact on operations. In terms of lighting effects, traditional lighting may have problems such as uneven brightness and poor color rendering. LED can provide uniform, bright and accurate light, improve the quality of operational services, and give passengers a more comfortable visual experience in the car, while also helping staff to clearly observe the situation inside the car. The operating environment of subway vehicles is complex, and factors such as vibration and temperature changes have high requirements for the stability of lamps. LED has good seismic resistance and a wide temperature adaptability range, and can maintain a stable working state under various harsh conditions.

[0004] However, there are still some problems with the current subway vehicle lighting system. In complex environments such as vibration during train operation, the stability of current and voltage is sometimes affected, causing lighting flickering, affecting passengers' riding experience, and posing operational safety risks. In addition, the poor compatibility of LED lighting drive technologies from different manufacturers brings certain difficulties to the overall maintenance and upgrade of the subway system. In customized solutions, it is still difficult to fully achieve uniform light distribution for some corners of special shapes in carriages, and there are certain lighting blind spots.

[0005] Therefore, how to solve the compatible input of different voltages and currents in subway vehicle lighting systems, optimize the lighting brightness control method, and improve the stability of the lighting system has become an urgent problem to improve operation quality and reduce maintenance costs. Summary of the invention

[0006] In order to overcome the above problems or at least partially solve the above problems, the present invention provides a subway vehicle LED lighting system and a control method thereof, which are compatible with 220V AC signals and 110V DC signals, and improve the convenience of lighting control and lighting effects.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] In a first aspect, the present invention provides a subway vehicle LED lighting system, comprising an input module, a DC-DC conversion module and an output control module, wherein the input module is connected to the DC-DC conversion module, and the DC-DC conversion module is also connected to the output control module;

[0009] The above-mentioned input module is used to access AC signals and DC signals, the above-mentioned output control module is used to drive and control the output of the DC-DC conversion module, and the above-mentioned DC-DC conversion module is used to perform voltage conversion processing on the input signal according to the control signal of the output control module, output the voltage value required by the LED lighting lamp, and realize the LED lighting control of the subway vehicle.

[0010] The input signal passes through the AC input terminal or the DC input terminal and enters the input module (the BOOST boost circuit can be selected), and after boosting, it enters the DC-DC conversion module (the FLYBACK conversion circuit is selected in this embodiment), and the output is output to the drive terminal after the output processing is completed. The signal is processed and protected, and then output to the output terminal to connect the LED light bar to complete the output control; the signal passes through the output control module, and the control output signal comes from the control chip (NT68168BTG can be selected), and then PWM is output to the DC-DC conversion module; the brightness control part (brightness control unit) (this embodiment adopts PWM mode) communicates wirelessly with the outside, and at the same time transmits the communication signal to the control chip (chip control unit), and the control chip designs the output voltage to achieve stepless voltage and dimming to increase stability.

[0011] This system, through the cooperation of multiple modules such as input module, DC-DC conversion module and output control module, has compatible input of 220V AC and 110V DC, can control the brightness level, and can achieve compatible input of 220V AC and 110V DC; solve the problem of inconvenient brightness control of LED lighting system; at the same time, it adopts stepless voltage regulation and dimming, and the LED lighting system will not have flickering problems.

[0012] Based on the first aspect, further, the above-mentioned input module includes an AC input rectifier unit and a DC input boost unit, the above-mentioned AC input rectifier unit is used to access the AC signal and sort the AC signal to obtain a corresponding DC signal; the above-mentioned DC input boost unit is used to access the DC signal and boost the DC signal.

[0013] Based on the first aspect, further, the above-mentioned AC input rectifier unit includes an L-type filter, an AC rectifier group, a power factor correction module circuit and a first Π-type filter. After the AC signal passes through the L-type filter, the power factor correction module circuit performs phase adjustment on the AC signal, and the adjusted AC signal is rectified by the AC sorting group into a sinusoidal half-wave DC power. The sinusoidal half-wave DC power is filtered into a quasi-sinusoidal half-wave DC power through the first Π-type filter.

[0014] Based on the first aspect, further, the above-mentioned DC input boost unit includes a D101 diode, a BD100 rectifier bridge, a boost circuit and a first filter capacitor group. The DC signal passes through the D101 diode and the BD100 rectifier bridge in sequence, is boosted to a target voltage through the boost circuit, and then is filtered through the first filter capacitor group and output.

[0015] Based on the first aspect, further, the above-mentioned DC-DC conversion module includes a voltage output value control unit and a high-voltage isolation circuit, the above-mentioned voltage output value control unit is connected to the above-mentioned output control module, and the above-mentioned high-voltage isolation circuit is connected to the above-mentioned voltage output value control unit, for converting the voltage value required for the output LED lighting lamp.

[0016] Based on the first aspect, further, the above-mentioned voltage output value control unit includes a flyback transformer, a second Π-type filter, an output voltage control circuit, a voltage feedback circuit and a second filter capacitor group. The DC signal is transformed into a DC signal with periodic jitter through the flyback transformer and the voltage feedback circuit, and then filtered into a flat DC signal through the second Π-type filter, and then transformed into a target voltage through the output voltage control circuit, and finally the final target voltage is output after filtering through the second filter capacitor group.

[0017] Based on the first aspect, further, the high-voltage isolation circuit includes a transformer, which isolates the high voltage and feeds back the voltage change to the output control module.

[0018] Based on the first aspect, further, the output control module includes a chip control unit and a light and dark control unit connected to the chip control unit, and the chip control unit is also connected to the DC-DC conversion module.

[0019] In a second aspect, the present invention provides a control method for a subway vehicle LED lighting system using any one of the above-mentioned first aspects, comprising the following steps:

[0020] Introducing AC or DC signals based on input modules;

[0021] The input module sends the AC signal or DC signal to the DC-DC conversion module;

[0022] The DC-DC conversion module performs voltage conversion processing on the AC signal or DC signal according to the control instructions sent by the output control module, outputs the voltage value required by the LED lighting, and realizes the LED lighting control of the subway vehicle.

[0023] The present invention has at least the following advantages or beneficial effects:

[0024] 1. It has compatible input of 220V AC and 110V DC, can control the brightness level, and can achieve compatible input of 220V AC and 110V DC;

[0025] 2. It can effectively solve the inconvenient brightness and darkness control problem of LED lighting system;

[0026] 3. Use stepless voltage and dimming to solve the flickering problem of LED lighting system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 This is a schematic diagram of the architecture of a subway vehicle LED lighting system according to an embodiment of the present invention;

[0029] Figure 2 A circuit diagram of an input module in a subway vehicle LED lighting system according to an embodiment of the present invention;

[0030] Figure 3 A circuit diagram of a DC-DC conversion module in a subway vehicle LED lighting system according to an embodiment of the present invention;

[0031] Figure 4 The schematic diagram of an output control module in a subway vehicle LED lighting system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0036] In the description of the embodiments of the present invention, "plurality" means at least 2.

[0037] Example:

[0038] like Figure 1-Figure 4 As shown, in the first aspect, an embodiment of the present invention provides a subway vehicle LED lighting system, comprising an input module, a DC-DC conversion module and an output control module, wherein the input module is connected to the DC-DC conversion module, and the DC-DC conversion module is also connected to the output control module;

[0039] The above-mentioned input module is used to access AC signals and DC signals, the above-mentioned output control module is used to drive and control the output of the DC-DC conversion module, and the above-mentioned DC-DC conversion module is used to perform voltage conversion processing on the input signal according to the control signal of the output control module, output the voltage value required by the LED lighting lamp, and realize the LED lighting control of the subway vehicle.

[0040] This system, through the cooperation of multiple modules such as input module, DC-DC conversion module and output control module, has compatible input of 220V AC and 110V DC, can control the brightness level, and can achieve compatible input of 220V AC and 110V DC; solve the problem of inconvenient brightness control of LED lighting system; at the same time, it adopts stepless voltage regulation and dimming, and the LED lighting system will not have flickering problems.

[0041] Based on the first aspect, further, the above-mentioned input module includes an AC input rectifier unit and a DC input boost unit, the above-mentioned AC input rectifier unit is used to access the AC signal and sort the AC signal to obtain a corresponding DC signal; the above-mentioned DC input boost unit is used to access the DC signal and boost the DC signal.

[0042] Based on the first aspect, further, the above-mentioned AC input rectifier unit includes an L-type filter, an AC rectifier group, a power factor correction module circuit and a first Π-type filter. After the AC signal passes through the L-type filter, the power factor correction module circuit performs phase adjustment on the AC signal, and the adjusted AC signal is rectified by the AC sorting group into a sinusoidal half-wave DC power. The sinusoidal half-wave DC power is filtered into a quasi-sinusoidal half-wave DC power through the first Π-type filter.

[0043] In some embodiments of the present invention, the above-mentioned L-type filter includes CC108, C100, C245 capacitors, L1, L2, L3 inductors; the above-mentioned AC rectifier group includes D104 diode group and BD100 rectifier bridge; the above-mentioned power factor correction module circuit includes REL100 variable resistor and PTC100 thermal resistor.

[0044] Based on the first aspect, further, the above-mentioned DC input boost unit includes a D101 diode, a BD100 rectifier bridge, a boost circuit and a first filter capacitor group. The DC signal passes through the D101 diode and the BD100 rectifier bridge in sequence, is boosted to a target voltage through the boost circuit, and then is filtered through the first filter capacitor group and output.

[0045] In some embodiments of the present invention, Figure 2 As shown, the boost circuit includes a C104 capacitor, a BO control port and an L103 inductor; the first filter capacitor group includes CA198 and CE100 capacitors; the DC signal first passes through a D101 diode and a BD100 rectifier bridge, and the DC power passing through the C104 capacitor and the L103 inductor boost circuit is boosted to a target voltage through the BO control port, and then filtered and output through the filter capacitor group composed of CA198 and CE100.

[0046] Based on the first aspect, further, the above-mentioned DC-DC conversion module includes a voltage output value control unit and a high-voltage isolation circuit, the above-mentioned voltage output value control unit is connected to the above-mentioned output control module, and the above-mentioned high-voltage isolation circuit is connected to the above-mentioned voltage output value control unit, for converting the voltage value required for the output LED lighting lamp.

[0047] Based on the first aspect, further, the above-mentioned voltage output value control unit includes a flyback transformer, a second Π-type filter, an output voltage control circuit, a voltage feedback circuit and a second filter capacitor group. The DC signal is transformed into a DC signal with periodic jitter through the flyback transformer and the voltage feedback circuit, and then filtered into a flat DC signal through the second Π-type filter, and then transformed into a target voltage through the output voltage control circuit, and finally the final target voltage is output after filtering through the second filter capacitor group.

[0048] In some embodiments of the present invention, Figure 3 As shown, the above-mentioned flyback transformer includes Q114, Q116, Q118, Q120 MOSFET transistors and their peripheral circuit components and NP20TNS5T transformer, and also includes D111, D117 diodes; the above-mentioned second Π-type filter includes C139, C140, C134, C135, C140, C294 capacitors, L105A inductor and C133, C136, CA103 capacitors; the above-mentioned output voltage control circuit includes REL101, D109, D 114 diode, Q108 MOSFET, R106, R163, R152, R153, R155, R154 resistors, PTC102; the voltage feedback circuit includes R164, R165, RA172, RA173 resistors, CA106, CA105 capacitors, R177, R178, R172, R176, R171, R179, R180 resistors, M101; the second filter capacitor group includes CA102, CA101 capacitors. The DC power after the filter circuit is transformed into a periodically jittered DC power through a flyback transformer and a voltage feedback circuit, and then filtered into a flat DC power through a second Π-type filter, and then transformed into a target voltage through an output voltage control circuit, and finally outputs the target voltage after filtering through the second filter capacitor group.

[0049] Based on the first aspect, further, the high-voltage isolation circuit includes a transformer, which isolates the high voltage and feeds back the voltage change to the output control module. The high-voltage isolation circuit also includes resistors R175, R174, and R173, a capacitor C157, and diodes D119, D1120, D121, and D122.

[0050] Based on the first aspect, further, the output control module includes a chip control unit and a light and dark control unit connected to the chip control unit, and the chip control unit is also connected to the DC-DC conversion module.

[0051] In a second aspect, an embodiment of the present invention provides a control method for a subway vehicle LED lighting system using any one of the above-mentioned first aspects, comprising the following steps:

[0052] Introducing AC or DC signals based on input modules;

[0053] The input module sends the AC signal or DC signal to the DC-DC conversion module;

[0054] The DC-DC conversion module performs voltage conversion processing on the AC signal or DC signal according to the control instructions sent by the output control module, outputs the voltage value required by the LED lighting, and realizes the LED lighting control of the subway vehicle.

[0055] In the embodiments provided in the present application, it should be understood that the disclosed method and system can also be implemented in other ways. The method and system embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the method and system, method and computer program product according to multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or the flowchart, and the combination of boxes in the block diagram and / or the flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0056] In addition, the functional modules in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0058] It will be apparent to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present application. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A subway vehicle LED lighting system, characterized in that: It includes an input module, a DC-DC conversion module and an output control module, wherein the input module is connected to the DC-DC conversion module, and the DC-DC conversion module is also connected to the output control module; The input module is used to access AC signals and DC signals, the output control module is used to drive and control the output of the DC-DC conversion module, and the DC-DC conversion module is used to perform voltage conversion processing on the input signal according to the control signal of the output control module, output the voltage value required by the LED lighting lamp, and realize the LED lighting control of the subway vehicle.

2. A subway vehicle LED lighting system according to claim 1, characterized in that: The input module includes an AC input rectifier unit and a DC input boost unit. The AC input rectifier unit is used to access an AC signal and sort the AC signal to obtain a corresponding DC signal; the DC input boost unit is used to access a DC signal and boost the DC signal.

3. A subway vehicle LED lighting system according to claim 2, characterized in that: The AC input rectifier unit includes an L-type filter, an AC rectifier group, a power factor correction module circuit and a first Π-type filter. After the AC signal passes through the L-type filter, the power factor correction module circuit performs phase adjustment on the AC signal, and the AC sorting group rectifies the adjusted AC signal into a sinusoidal half-wave DC power. The sinusoidal half-wave DC power is filtered into a quasi-sinusoidal half-wave DC power through the first Π-type filter.

4. A subway vehicle LED lighting system according to claim 2, characterized in that: The DC input boost unit includes a D101 diode, a BD100 rectifier bridge, a boost circuit and a first filter capacitor group. The DC signal passes through the D101 diode and the BD100 rectifier bridge in sequence, is boosted to a target voltage through the boost circuit, and is then filtered through the first filter capacitor group and output.

5. The subway vehicle LED lighting system according to claim 1, characterized in that: The DC-DC conversion module includes a voltage output value control unit and a high-voltage isolation circuit. The voltage output value control unit is connected to the output control module, and the high-voltage isolation circuit is connected to the voltage output value control unit for converting the voltage value required for the output LED lighting lamp.

6. A subway vehicle LED lighting system according to claim 5, characterized in that: The voltage output value control unit includes a flyback transformer, a second Π-type filter, an output voltage control circuit, a voltage feedback circuit and a second filter capacitor group. The DC signal is transformed into a DC signal with periodic jitter through the flyback transformer and the voltage feedback circuit, and then filtered into a straight DC signal through the second Π-type filter, and then transformed into a target voltage through the output voltage control circuit, and finally the final target voltage is output after filtering through the second filter capacitor group.

7. The subway vehicle LED lighting system according to claim 5, characterized in that: The high voltage isolation circuit includes a transformer, which isolates the high voltage and feeds back the voltage change to the output control module.

8. The subway vehicle LED lighting system according to claim 1, characterized in that: The output control module includes a chip control unit and a light and dark control unit connected to the chip control unit. The chip control unit is also connected to the DC-DC conversion module.

9. A control method for a subway vehicle LED lighting system according to any one of claims 1 to 8, characterized in that: The following steps are involved: Introducing AC or DC signals based on input modules; The input module sends the AC signal or DC signal to the DC-DC conversion module; The DC-DC conversion module performs voltage conversion processing on the AC signal or DC signal according to the control instructions sent by the output control module, outputs the voltage value required by the LED lighting, and realizes the LED lighting control of the subway vehicle.

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