Subway lighting control system

Abstract

The utility model provides a subway lighting control system. The subway illumination control system comprises a temperature detection module, a comparison circuit, a voltage selection module and a voltage-current conversion module, the temperature detection module is configured to detect the temperature of an illumination lamp, and the output end of the temperature detection module is connected to the first input end of the comparison circuit; the second input end of the comparison circuit is connected with a first reference voltage, the output end of the comparison circuit is connected to the control end of the voltage selection module, and the output end of the voltage selection module is connected to the input end of the voltage-current conversion module. The output end of the voltage-current conversion module is used for providing driving current for the lighting lamp. The problem of accelerated aging caused by long-time work of the lighting lamp can be solved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of automatic control, and particularly relates to a subway lighting control system. BACKGROUND

[0002] The operation time of urban subway is generally long, usually from 5 or 6 o'clock in the morning to 10 o'clock at night or even later, to meet the needs of urban residents' daily travel. In the entire operation time period, in order to provide a safe and comfortable travel environment for passengers, the subway lighting system needs to be kept on all the way to provide sufficient light for passengers in various links such as waiting on the platform, getting on and off the train, and riding in the carriage.

[0003] The long-time work of the subway lighting system will cause the temperature of the lighting lamp to be too high, and the high temperature will accelerate the chemical reaction inside the lighting lamp, so that the aging speed of the lighting lamp is accelerated. CONTENT OF THE UTILITY MODEL

[0004] The embodiment of the present disclosure provides a subway lighting control system to solve the problem of accelerated aging caused by long-time work of the lighting lamp.

[0005] The embodiment of the present disclosure provides a subway lighting control system, comprising a temperature detection module, a comparison circuit, a voltage selection module and a voltage-current conversion module,

[0006] The temperature detection module is configured to detect the temperature of the lighting lamp, the output end of the temperature detection module is connected to the first input end of the comparison circuit, the second input end of the comparison circuit is connected with a first reference voltage, the output end of the comparison circuit is connected to the control end of the voltage selection module, the output end of the voltage selection module is connected to the input end of the voltage-current conversion module, and the output end of the voltage-current conversion module is used to provide a driving current for the lighting lamp.

[0007] In an exemplary embodiment of the present disclosure, the voltage selection module comprises an NMOS tube Q1, a PMOS tube Q2, a PMOS tube Q3, a resistor R2 and a voltage stabilizing tube DW,

[0008] The control end of the NMOS tube Q1, the control end of the PMOS tube Q2 and the control end of the PMOS tube Q3 are connected with the output end of the comparison circuit,

[0009] The first end of the NMOS tube Q1 is connected with a first power supply, and the second end of the NMOS tube Q1 is the output end of the voltage selection module,

[0010] The first end of the PMOS tube Q2 is connected with the first power supply through the resistor R2, the second end of the PMOS tube Q2 is connected with the first end of the PMOS tube Q3, the second end of the PMOS tube Q3 is connected with the second end of the NMOS tube Q1,

[0011] The cathode of the voltage stabilizing tube DW is connected with the second end of the PMOS tube Q2, and the anode of the voltage stabilizing tube DW is grounded.

[0012] In an exemplary embodiment of the present disclosure, the voltage-current conversion module comprises an operational amplifier U2, a resistor R3, a switch tube Q4 and a resistor R4,

[0013] The non-inverting input end of the operational amplifier U2 is the input end of the voltage-current conversion module, the output end of the operational amplifier U2 is connected with the control end of the switch tube Q4 through the resistor R3, the first end of the switch tube Q4 is grounded through the resistor R4, and the first end of the switch tube Q4 is connected with the inverting input end of the operational amplifier U2 in feedback,

[0014] The second end of the switch tube Q4 is the output end of the voltage-current conversion module.

[0015] In an exemplary embodiment of the present disclosure, the temperature detection module comprises a resistor R1 and a thermistor RT, the first end of the resistor R1 is connected with the second power supply, the second end of the resistor R1 is grounded through the thermistor RT, and the second end of the resistor R1 is the output end of the temperature detection module.

[0016] In an exemplary embodiment of the present disclosure, the lighting fixture comprises multiple groups in parallel, each group of the lighting fixture is provided with a lighting switch, and the subway lighting control system further comprises a passenger flow detection module and an illumination detection module connected with the controller,

[0017] The passenger flow detection module is used for detecting the passenger flow in the subway, the illumination detection module is used for detecting the ambient illumination intensity in the subway, and the controller is configured to control the opening or closing of the lighting switch based on the output signals of the passenger flow detection module and the illumination detection module.

[0018] In an exemplary embodiment of the present disclosure, the subway lighting control system further comprises an alternating voltage detection module, a hysteresis comparator and a switching switch,

[0019] The AC voltage detection module is configured to detect the voltage of the AC power supply, the first input end of the hysteresis comparator is connected with the output end of the AC voltage detection module, the second input end of the hysteresis comparator is connected with the second reference voltage, the output end of the hysteresis comparator is connected with the control end of the switching switch, the first end of the switching switch is used to be connected with the AC power supply, and the second end of the switching switch is used to be connected with the standby power supply.

[0020] In an example embodiment of the present disclosure, the subway lighting control system further comprises a leakage protection module.

[0021] The subway lighting control system provided by the example embodiments of the present disclosure has the following advantages:

[0022] In the example embodiments of the present disclosure, the temperature detection module is used to detect the temperature of the lighting fixture in real time, the output end of the temperature detection module is connected with the first input end of the comparison circuit, when the temperature of the lighting fixture is normal, the output voltage of the temperature detection module is less than the first reference voltage, and the comparison circuit outputs a first level signal; when the temperature of the lighting fixture is greater than a set value, the output voltage of the temperature detection module is greater than the first reference voltage, and the comparison circuit outputs a second level signal. The level signal output by the comparison circuit is connected with the control end of the voltage selection module, when the comparison circuit outputs the first level signal, the voltage selection module outputs a higher first voltage, and when the comparison circuit outputs the second level signal, the voltage selection module outputs a lower second voltage, so that the output current of the voltage-current conversion module is reduced, that is, the driving current of the lighting fixture is reduced.

[0023] The example embodiments of the present disclosure can reduce the current of the lighting fixture when the temperature of the lighting fixture is too high, slow down the aging speed of the lighting fixture, and thus prolong the service life of the lighting fixture. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the example embodiments of the present disclosure, the following will briefly introduce the drawings needed to be used in the example embodiments or the prior art description. Obviously, the drawings in the following description are only some example embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without any creative labor.

[0025] Figure 1 is a schematic diagram of the subway lighting control system provided by the example embodiments of the present disclosure;

[0026] Figure 2 is a schematic diagram of the power supply switching provided by the example embodiments of the present disclosure. DETAILED DESCRIPTION

[0027] In order to make the person skilled in the art better understand the scheme, the technical solutions in the scheme embodiments will be clearly described below in combination with the drawings in the scheme embodiments. Obviously, the described embodiments are part of the embodiments of the scheme, rather than all the embodiments. Based on the embodiments in the scheme, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the scheme.

[0028] The term "comprising" and other any variations thereof in the specification and claims of the scheme and the above-mentioned drawings means "including but not limited to", which is intended to cover non-exclusive inclusion and is not limited to the examples listed in the text. In addition, the terms "first" and "second" and the like are used to distinguish different objects, rather than to describe a specific order.

[0029] The implementation of the present disclosure is described in detail below in combination with specific drawings:

[0030] Figure 1 A schematic diagram of a subway lighting control system provided by an embodiment of the present disclosure is provided. Referring to Figure 1 The subway lighting control system includes a temperature detection module, a comparison circuit, a voltage selection module and a voltage-current conversion module,

[0031] The temperature detection module is configured to detect the temperature of the lighting fixture. The output end of the temperature detection module is connected to the first input end of the comparison circuit. The second input end of the comparison circuit is connected to the first reference voltage. The output end of the comparison circuit is connected to the control end of the voltage selection module. The output end of the voltage selection module is connected to the input end of the voltage-current conversion module. The output end of the voltage-current conversion module is used to provide driving current for the lighting fixture.

[0032] In the present embodiment, the temperature detection module is used to detect the temperature of the lighting fixture in real time. The output end of the temperature detection module is connected to the first input end of the comparison circuit. When the temperature of the lighting fixture is normal, the output voltage of the temperature detection module is less than the first reference voltage, and the comparison circuit outputs a first level signal. When the temperature of the lighting fixture is greater than a set value, the output voltage of the temperature detection module is greater than the first reference voltage, and the comparison circuit outputs a second level signal. The level signal output by the comparison circuit is connected to the control end of the voltage selection module. When the comparison circuit outputs the first level signal, the voltage selection module outputs a higher first voltage. When the comparison circuit outputs the second level signal, the voltage selection module outputs a lower second voltage, so that the output current of the voltage-current conversion module is reduced, that is, the driving current of the lighting fixture is reduced.

[0033] The voltage selection module can include a multiplexer switch and reference power supplies of two different output voltages, a control end of the voltage selection module is connected with an output end of the comparison circuit, and different level signals output by the comparison circuit can control the gating of different reference power supplies, so that different output voltages are obtained.

[0034] The embodiment can reduce the current of the lighting lamp when the temperature of the lighting lamp is too high, slow down the aging speed of the lighting lamp, and prolong the service life of the lighting lamp.

[0035] Reference Figure 1 In an example embodiment of the present disclosure, the voltage selection module includes an NMOS tube Q1, a PMOS tube Q2, a PMOS tube Q3, a resistor R2, and a voltage stabilizing tube DW,

[0036] The control end of the NMOS tube Q1, the control end of the PMOS tube Q2, and the control end of the PMOS tube Q3 are connected with the output end of the comparison circuit,

[0037] The first end of the NMOS tube Q1 is connected with the first power supply, and the second end of the NMOS tube Q1 is the output end of the voltage selection module,

[0038] The first end of the PMOS tube Q2 is connected with the first power supply through the resistor R2, the second end of the PMOS tube Q2 is connected with the first end of the PMOS tube Q3, and the second end of the PMOS tube Q3 is connected with the second end of the NMOS tube Q1,

[0039] The cathode of the voltage stabilizing tube DW is connected with the second end of the PMOS tube Q2, and the anode of the voltage stabilizing tube DW is grounded.

[0040] In the embodiment, a specific implementation of the voltage selection module is given. When the comparison circuit outputs a first level (for example, a high level), the NMOS tube Q1 is turned on, the first power supply VDD is connected to the input end of the voltage-current conversion module through the NMOS tube Q1, and the input end of the voltage-current conversion module receives a higher first voltage.

[0041] When the comparison circuit outputs a second level signal (for example, a low level signal), the PMOS tube Q2 and the PMOS tube Q3 are turned on, the first power supply VDD is connected to the input end of the voltage-current conversion module through the PMOS tube Q2 and the PMOS tube Q3, and due to the clamping effect of the voltage stabilizing tube DW, the input end voltage of the voltage-current conversion module is the cathode voltage of the voltage stabilizing tube DW, which is lower than the voltage of the first power supply VDD.

[0042] From the above, it can be concluded that the arrangement of the NMOS tube Q1, the PMOS tube Q2, the PMOS tube Q3, and the voltage stabilizing tube DW in the embodiment can realize two different output voltages based on one power supply.

[0043] ReferenceFigure 1 In an example embodiment of the present disclosure, the voltage-current conversion module comprises an operational amplifier U2, a resistor R3, a switch tube Q4, and a resistor R4,

[0044] The non-inverting input terminal of the operational amplifier U2 is the input terminal of the voltage-current conversion module, the output terminal of the operational amplifier U2 is connected to the control terminal of the switch tube Q4 through the resistor R3, the first terminal of the switch tube Q4 is connected to the ground through the resistor R4, and the first terminal of the switch tube Q4 is connected to the inverting input terminal of the operational amplifier U2 through a feedback connection,

[0045] The second terminal of the switch tube Q4 is the output terminal of the voltage-current conversion module.

[0046] In this embodiment, the voltage at the non-inverting input terminal of the operational amplifier U2 is equal to the output voltage of the voltage selection circuit, which is denoted as ui. According to the "virtual short" principle of the operational amplifier, the voltage at the inverting input terminal of the operational amplifier U2 is equal to the voltage at the non-inverting input terminal. Therefore, the voltage at the inverting input terminal of the operational amplifier U2 is equal to ui, and the current i through the resistor R4 is ui / R4.

[0047] At the same time, according to the "virtual open" principle of the operational amplifier, the current at the inverting input terminal of the operational amplifier U2 is 0. Therefore, the current at the emitter of the switch tube Q4 is equal to the current through the resistor R4. Since the collector current of the switch tube Q4 (i.e., the current of the lighting fixture) is approximately equal to the current at the emitter, the current of the lighting fixture is equal to the current through the resistor R4, thereby achieving the voltage-current conversion function.

[0048] Referring to Figure 1 In an example embodiment of the present disclosure, the temperature detection module comprises a resistor R1 and a thermistor RT, the first terminal of the resistor R1 is connected to the second power supply, the second terminal of the resistor R1 is connected to the ground through the thermistor RT, and the second terminal of the resistor R1 is the output terminal of the temperature detection module.

[0049] In this embodiment, the resistor R1 and the thermistor RT form a series voltage divider circuit, and the voltage division of the thermistor RT serves as the output voltage of the temperature detection module. The resistance of the thermistor RT increases with increasing temperature, and therefore the output voltage of the temperature detection module increases with increasing temperature.

[0050] In an example embodiment of the present disclosure, the lighting fixture comprises multiple groups in parallel, each group of lighting fixtures is provided with a lighting switch, and the subway lighting control system further comprises a passenger flow detection module and a light detection module connected to the controller,

[0051] The passenger flow detection module is used to detect the passenger flow in the subway, the light detection module is used to detect the ambient light intensity in the subway, and the controller is configured to control the opening or closing of the lighting switch based on the output signals of the passenger flow detection module and the light detection module.

[0052] In the embodiment, the passenger flow detection module can be implemented by a video monitoring module. The number of people can be obtained by image analysis of the monitoring video. The passenger flow detection module can also be implemented by an infrared induction module. The infrared induction module detects the movement of the human body to master the passenger flow in different areas of the subway in real time. The light detection module can use a photosensitive sensor and other devices to measure the light intensity of the internal environment of the subway.

[0053] The output terminals of the passenger flow detection module and the light detection module are connected to the controller. The controller compares the detected passenger flow with the preset passenger flow threshold to determine the current passenger flow condition. At the same time, the controller compares the light intensity with the preset light threshold to determine the current light level. According to the analysis result, the controller generates a corresponding control instruction to control different numbers of lighting lamps to work. For example, during the low peak period of subway operation, the passenger flow is small, and the controller can automatically turn off part of the lamp groups to reduce power consumption.

[0054] As can be seen from the above, the embodiment controls different numbers of lighting lamps to work based on the passenger flow and the light intensity, reduces the power consumption as much as possible on the basis of ensuring the lighting effect.

[0055] Reference Figure 2 In an exemplary embodiment of the present disclosure, the subway lighting control system further comprises an alternating voltage detection module, a hysteresis comparator and a switching switch,

[0056] The alternating voltage detection module is configured to detect the voltage of the alternating power supply. The first input terminal of the hysteresis comparator is connected to the output terminal of the alternating voltage detection module. The second input terminal of the hysteresis comparator is connected to the second reference voltage. The output terminal of the hysteresis comparator is connected to the control terminal of the switching switch. The first terminal of the switching switch is used to be connected to the alternating power supply. The second terminal of the switching switch is used to be connected to the backup power supply.

[0057] In the embodiment, the alternating voltage detection module is used to detect the voltage of the alternating power supply. When the voltage of the alternating power supply deviates from the normal range, the backup power supply can be quickly switched. In order to avoid the frequent switching of the backup power supply caused by the slight fluctuation of the voltage of the alternating power supply, a hysteresis comparator is arranged between the alternating voltage detection module and the switching switch. It is ensured that the switching operation is only performed when the voltage deviates enough, the number of unnecessary switching is reduced, and the reliability of the entire subway lighting control system is improved.

[0058] In an exemplary embodiment of the present disclosure, the subway lighting control system further comprises a leakage protection module.

[0059] In the embodiment, the subway environment is crowded, the lighting system is widely distributed, if the lighting circuit or the lamp is damaged due to insulation, the passenger and the staff may be electrocuted, in order to avoid the above problems, the embodiment is provided with the leakage protection module, when the lighting system leaks, the leakage protection module can quickly detect and cut off the power supply, and the personal safety is protected.

[0060] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A subway lighting control system, characterized by, The temperature detection module is configured to detect the temperature of the lighting lamp, the output end of the temperature detection module is connected to the first input end of the comparison circuit, the second input end of the comparison circuit is connected with a first reference voltage, the output end of the comparison circuit is connected to the control end of the voltage selection module, the output end of the voltage selection module is connected to the input end of the voltage-current conversion module, and the output end of the voltage-current conversion module is used to provide a driving current for the lighting lamp. The voltage selection module comprises an NMOS tube Q1, a PMOS tube Q2, a PMOS tube Q3, a resistor R2 and a voltage stabilizing tube DW, 2. The subway lighting control system of claim 1, wherein, The control end of the NMOS tube Q1, the control end of the PMOS tube Q2 and the control end of the PMOS tube Q3 are connected with the output end of the comparison circuit, The first end of the NMOS tube Q1 is connected with a first power supply, and the second end of the NMOS tube Q1 is the output end of the voltage selection module, The first end of the PMOS tube Q2 is connected with the first power supply through the resistor R2, the second end of the PMOS tube Q2 is connected with the first end of the PMOS tube Q3, and the second end of the PMOS tube Q3 is connected with the second end of the NMOS tube Q1, The cathode of the voltage stabilizing tube DW is connected with the second end of the PMOS tube Q2, and the anode of the voltage stabilizing tube DW is grounded. The voltage-current conversion module comprises an operational amplifier U2, a resistor R3, a switch tube Q4 and a resistor R4, 3. The subway lighting control system of claim 1, wherein, The non-inverting input end of the operational amplifier U2 is the input end of the voltage-current conversion module, the output end of the operational amplifier U2 is connected with the control end of the switch tube Q4 through the resistor R3, the first end of the switch tube Q4 is grounded through the resistor R4, and the first end of the switch tube Q4 is feedback connected to the inverting input end of the operational amplifier U2, The second end of the switch tube Q4 is the output end of the voltage-current conversion module. The temperature detection module comprises a resistor R1 and a thermistor RT, the first end of the resistor R1 is connected with a second power supply, the second end of the resistor R1 is grounded through the thermistor RT, and the second end of the resistor R1 is the output end of the temperature detection module.

4. The subway lighting control system of claim 1, wherein The lighting lamp comprises a plurality of groups in parallel, each group of the lighting lamp is provided with a lighting switch, and the subway lighting control system further comprises a passenger flow detection module and an illumination detection module connected with the controller, 5. The subway lighting control system of claim 1, wherein, The passenger flow detection module is used to detect the passenger flow in the subway, the illumination detection module is used to detect the ambient illumination intensity in the subway, and the controller is configured to control the opening or closing of the lighting switch based on the output signals of the passenger flow detection module and the illumination detection module. Further comprising an alternating voltage detection module, a hysteresis comparator and a switching switch, 6. A subway lighting control system as claimed in claim 1, wherein, ​ The AC voltage detection module is configured to detect the voltage of the AC power supply, the first input end of the hysteresis comparator is connected with the output end of the AC voltage detection module, the second input end of the hysteresis comparator is connected with the second reference voltage, the output end of the hysteresis comparator is connected with the control end of the switching switch, the first end of the switching switch is used for being connected with the AC power supply, and the second end of the switching switch is used for being connected with the standby power supply.

7. The subway lighting control system of claim 1, wherein, The leakage protection module is further included.

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