A navigation lighting system capable of detecting open circuit faults and a detection method thereof

Abstract

The present application relates to a navigation lighting system and detection method capable of detecting fault open circuits, which includes a constant current source for providing a constant current; an overcurrent protection branch, the input end of which is connected to the constant current source, and the overcurrent protection branch is provided with a first enabling end for obtaining a switch control signal, the overcurrent protection branch is always on, and can be disconnected based on the switch control signal, and can also be disconnected based on the current size and power-on duration; a shunt branch, the input end of which is connected to the constant current source, and the shunt branch is provided with a second enabling end for obtaining a switch control signal, the shunt branch is always off, and can be turned on based on the switch control signal; a drive module, which is used to control the power output to the LED lamp and send a switch control signal; and an LED lamp, which is connected to the output end of the drive module. The present application realizes that in the event of a fault in the drive system, an open circuit can still be provided when a fault occurs in either the drive system or the LED lamp, thereby avoiding the risks brought by a detection blind spot.

Description

Technical Field

[0001] The present application relates to the field of lighting, and in particular to a navigation lighting system and a detection method capable of performing fault open circuit detection. Background Art

[0002] At present, navigation lights are a number of lamps arranged in sequence on the waterway. In order to avoid the problem of high brightness at the beginning and low brightness at the end of the lamps when powering over long distances, the power supply system for navigation lights currently usually adopts a constant current source system.

[0003] Early navigation lights used halogen light sources, which would appear as an open circuit if the light source failed. Since the power supply system uses a constant current source, if the light source appears as an open circuit, a very high voltage will be generated, and then the voltage can be detected to determine whether the lamp has failed. Currently, most navigation lights have been upgraded from halogen light sources to LED light sources, but since LED light sources do not match the airport's constant current source system, a drive system is required to convert the input electrical energy into electrical energy that is compatible with the LED light source.

[0004] In order to simulate the open circuit detection method of halogen lamps to detect the fault of LED light sources, the current drive system usually develops an open circuit module. When the open circuit module detects that the LED light source is faulty, it will control the open circuit module to work through the internal CPU. However, such a solution has the following omissions: if the drive system itself has a fault, the fault of the LED light source cannot be detected, and the CPU cannot control the open circuit module to provide an open circuit, which creates a hidden danger.

[0005] In view of the above situation, the present application proposes a navigation lighting system and a detection method capable of performing fault open circuit detection, so as to solve the problem that the open circuit module cannot provide an open circuit when a driving system fails. Summary of the invention

[0006] In order to solve the problem that the open circuit module cannot provide an open circuit when a driving system fails, the present application provides a navigation lighting system and a detection method capable of performing fault open circuit detection.

[0007] In a first aspect, the present application provides a navigation lighting system capable of performing fault open circuit detection, which adopts the following technical solution:

[0008] A navigation lighting system capable of performing fault open circuit detection, comprising:

[0009] A constant current source for providing a constant current;

[0010] An overcurrent protection branch, the input end of which is connected to a constant current source, the overcurrent protection branch is provided with a first enabling end for obtaining a switch control signal, the overcurrent protection branch is always on, can be disconnected based on the switch control signal, and can also be disconnected based on the current size and the power-on time;

[0011] A shunt branch, the input end of which is connected to a constant current source, the shunt branch is provided with a second enabling end for obtaining a switch control signal, the shunt branch is normally off, and can be turned on based on the switch control signal;

[0012] A driving module and an LED lamp, wherein the LED lamp is connected to an output end of the driving module and operates based on the electric energy output by the driving module;

[0013] The driving module is used to control the power output to the LED lamp and send a switch control signal, and the driving module includes a modulation module and a control module;

[0014] A modulation module, wherein an input end of the modulation module is simultaneously connected to an output end of the overcurrent protection branch and an output end of the shunt branch, and the modulation module controls the output of electric energy based on a modulation control signal, and generates a second detection signal based on the output current;

[0015] A control module, the control module is connected to the modulation module and outputs a modulation control signal, and the control module sends a switch control signal based on the second detection signal;

[0016] When the LED lamp, the control module and the modulation module are all working, the shunt branch is turned on and the overcurrent protection branch is turned off; when the LED lamp fails, the overcurrent protection branch is turned on and turned off based on the current size and the power-on time, and the shunt branch is turned off at the same time; when the modulation module fails, the overcurrent protection branch is turned on and turned off based on the current size and the power-on time, and the shunt branch is turned off at the same time; when the control module fails, the overcurrent protection branch in the normally on state is turned on and turned off based on the current size and the power-on time, and the shunt branch in the normally off state is turned off;

[0017] The output voltage of the constant current source changes based on whether the driving module and the LED lamp are turned on or off.

[0018] By adopting the above technical solution, when the LED lamp, the modulation module and the control module are all working, the constant current source inputs a constant current, the overcurrent protection branch is in the on state, and the shunt branch is in the off state. The modulation module detects its own output electric energy, generates and sends a high-level second detection signal to the control module based on the detection result, and the control module sends a high-level switch control signal based on the received high-level second detection signal. The second enable terminal on the shunt branch receives the high-level switch control signal to make the shunt branch conductive and the overcurrent protection branch disconnected.

[0019] When the LED lamp fails during the start-up process, the constant current source inputs a constant current, the overcurrent protection branch is in the on state, and the shunt branch is in the off state. The modulation module detects its own output electric energy, generates and sends a low-level second detection signal to the control module based on the detection result, and the control module sends a low-level switch control signal based on the low-level second detection signal. The first enable end on the overcurrent protection branch receives the low-level switch control signal, so that the overcurrent protection branch is continuously turned on and disconnected based on the current size and the power-on time, and the shunt branch remains in the off state.

[0020] When the LED lamp fails during use, the constant current source inputs a constant current, the shunt branch is turned on, the modulation module detects its own output electric energy, and the second detection signal sent to the control module changes from a high level to a low level. The control module detects the low-level second detection signal and sends a low-level switch control signal. The first enable end on the overcurrent protection branch receives the low-level switch control signal, so that the overcurrent protection branch is turned on and disconnected based on the current size and the power-on time. Similarly, the shunt branch is disconnected.

[0021] When the modulation module fails during the startup process, the constant current source inputs a constant current, the overcurrent protection branch is turned on, and the shunt branch is disconnected. The modulation module sends a low-level second detection signal due to the fault or cannot send the second detection signal due to the fault, resulting in the control module receiving a low-level second detection signal that is erroneously sent or being unable to receive the second detection signal. Therefore, the control module sends a low-level switch control signal or does not send a switch control signal, resulting in two situations, namely, the first enable end of the overcurrent protection branch receives a low-level switch control signal and turns on, or both the first enable end and the second enable end cannot receive the switch control signal, causing the overcurrent protection branch to continue to be turned on and disconnected based on the current size and the power-on time. Similarly, the shunt branch is continuously disconnected.

[0022] When the modulation module fails during use, the constant current source inputs a constant current, the shunt branch is turned on, and the overcurrent protection branch is disconnected. The second detection signal emitted by the modulation module changes from a high level to a low level or fails to emit a second detection signal due to the fault, which causes the control module to receive a low-level second detection signal that is erroneously emitted or fails to receive the second detection signal. The control module emits a low-level switch control signal or does not emit a switch control signal, resulting in two situations: the first enable end of the overcurrent protection branch receives a low-level switch control signal and turns on, or both the first enable end and the second enable end cannot receive a switch control signal, causing the normally on overcurrent protection branch to turn on and be disconnected based on the current size and the power-on time. Similarly, the shunt branch is disconnected.

[0023] When the control module fails during the startup process, the constant current source inputs a constant current, the overcurrent protection branch is turned on, the shunt branch is disconnected, and the modulation module can send a high-level second detection signal, but at this time the control module sends a low-level switch control signal or cannot send a switch control signal due to the fault, and then two situations occur, namely, the first enable end of the overcurrent protection branch receives a low-level switch control signal and turns on, or the first enable end and the second enable end cannot receive the switch control signal, so that the overcurrent protection branch continues to be turned on and disconnected based on the current size and the power-on time. Similarly, the shunt branch continues to be disconnected.

[0024] When the control module fails during use, the constant current source inputs a constant current, the shunt branch is turned on, the overcurrent protection branch is disconnected, the modulation module can send a high-level second detection signal, and the control module sends a low-level switch control signal or cannot send a switch control signal due to the fault, resulting in two situations, namely, the first enable end of the overcurrent protection branch receives a low-level switch control signal and turns on, or both the first enable end and the second enable end cannot receive the switch control signal, causing the normally-on overcurrent protection branch to turn on and be disconnected based on the current size and power-on time. Similarly, the shunt branch is disconnected.

[0025] To summarize, when an LED lamp fails, since the overcurrent protection branch can be disconnected based on the current size and the power-on time, the control module can control the overcurrent protection branch to be turned on to provide an open circuit; when a modulation module or a control module fails, since the overcurrent protection branch is always on, the control module cannot send a switch control signal to control the overcurrent protection branch to be disconnected, and an open circuit can also be provided. Therefore, the present application realizes that when a problem occurs in the device for detecting LED fault conditions, causing the CPU to be unable to control the open circuit module to provide an open circuit, although the fault condition of the LED lamp cannot be detected or the control signal cannot be sent, it can still provide an open circuit when any one of the modulation module, the control module or the LED lamp fails, thereby avoiding the risks brought by potential detection blind spots.

[0026] Optionally, the overcurrent protection branch includes a thermal fuse, which melts when the temperature rises above a rated temperature.

[0027] By adopting the above technical solution, when the overcurrent protection branch is turned on for a period of time, the temperature of the thermal fuse will continue to rise. When the temperature rises to exceed the rated temperature, the fuse in the thermal fuse will blow, causing the overcurrent protection branch where the thermal fuse is located to change from a conducting state to an open state.

[0028] Optionally, a first switch is provided on the overcurrent protection branch, and the first switch is formed with the first enable terminal for obtaining a switch control signal.

[0029] Optionally, a second switch is provided on the shunt branch, and a second enable terminal for obtaining a switch control signal is formed on the second switch.

[0030] By adopting the above technical solution, the above-mentioned first enable end and the second enable end are both ports for receiving switch control signals. When neither the first enable end nor the second enable end receives the switch control signal, the first switch will remain in a closed state and the second switch will remain in an open state; when the switch control signal is at a low level, the first enable end will control the first switch to close so that the overcurrent protection branch is turned on and disconnected based on the current size and the power-on time, and the second enable end will control the second switch to disconnect so that the shunt branch is disconnected; when the switch control signal is at a high level, the first enable end will control the first switch to disconnect so that the shunt branch is turned on, and the second enable end will control the second switch to close so that the overcurrent protection branch is disconnected.

[0031] Optionally, it also includes a relay, which is connected to the control module, and the relay includes a relay coil and a single-pole double-throw switch. The end of the overcurrent protection branch away from the constant current source forms a first contact of the single-pole double-throw switch, and the end of the shunt branch away from the constant current source forms a second contact of the single-pole double-throw switch. The relay coil is provided with an enable terminal for controlling its own power on and off, and the enable terminal includes the first enable terminal and the second enable terminal. The relay coil controls the switching of the single-pole double-throw switch based on a switch control signal.

[0032] By adopting the above technical solution, when the switch control signal is sent to the enable end of the relay coil, the relay coil will control the switching of the single-pole double-throw switch based on the switch control signal, thereby controlling the on and off of the overcurrent protection branch and the shunt branch.

[0033] Specifically, when the LED lamp, the control module and the modulation module are all working, the relay is energized, the enable end receives a high-level switch control signal, the relay coil controls the single-pole double-throw switch to switch from the first contact to the second contact, the shunt branch is turned on and the overcurrent protection branch is disconnected; when the LED lamp fails, the relay is energized, the enable end receives a low-level switch control signal, the relay coil controls the single-pole double-throw switch to switch from the second contact to the first contact, the overcurrent protection branch is turned on and disconnected based on the current size and the power-on time, and the shunt branch is turned on and the overcurrent protection branch is disconnected. The flow branch is disconnected; when the modulation module fails, the relay is energized, the enable end receives a low-level switch control signal, the relay coil controls the single-pole double-throw switch to switch from the second contact to the first contact, the overcurrent protection branch is turned on and disconnected based on the current size and the power-on time, and the shunt branch is disconnected at the same time; when the control module fails, the relay loses power, and the relay coil cannot control the single-pole double-throw switch, so that the overcurrent protection branch in the normally-on state is turned on and disconnected based on the current size and the power-on time, and the shunt branch in the normally-off state is disconnected.

[0034] Optionally, the modulation module includes:

[0035] a modulation unit, wherein the modulation unit controls the output of electric energy based on a modulation control signal;

[0036] The detection unit generates a second detection signal based on the current output by the detection unit.

[0037] By adopting the above technical solution, since the LED lamp and the constant current source system of the airport are not matched, a modulation unit is required to convert the input electrical energy into electrical energy compatible with the LED lamp. When the modulation unit transmits the converted electrical energy to the LED lamp, the detection unit will detect the above electrical energy and generate a second detection signal. The second detection signal will be sent to the control unit for analyzing whether the LED lamp is faulty.

[0038] Optionally, the modulation module cooperates with the control module to form a driving module, and the driving module is used to control the power output to the LED lamp and send a switch control signal.

[0039] Optionally, an output detection module is also included, wherein the output detection module is used to detect the output voltage of the constant current source and output a first detection signal, and the first detection signal is used for the main control system to obtain the output voltage change of the constant current source.

[0040] By adopting the above technical solution, the first detection signal is sent to the main control system for analyzing whether it is the LED lamp failure or the modulation module and the control module failure. Since the resistance values ​​of the LED lamp and the driving module are different and are connected in parallel, the current input by the constant current source remains constant. Therefore, when any one of the LED lamp or the driving module fails and opens the circuit, the output voltage of the constant current source will change differently. By judging the voltage change through the first detection signal, the location of the fault can be determined; when a short circuit occurs, the voltage at the output end of the constant current source will drop to 0 volts, so this situation can also be determined by the first detection signal.

[0041] In a second aspect, the present application provides a method for detecting an open circuit fault in a navigation light, which adopts the following technical solution:

[0042] A method for detecting an open circuit fault of a navigation light comprises the following steps:

[0043] A constant current source is provided for inputting a constant current, wherein the constant current is used to provide electric energy to a modulation module, the modulation module is used to control the output of electric energy, and a power output end of the modulation module is electrically connected to an LED lamp;

[0044] A parallel overcurrent protection branch and an overcurrent protection branch are set as a connection channel from the constant current source to the modulation module, wherein the shunt branch is normally disconnected; the overcurrent protection branch is normally connected and can be disconnected based on the current size and power-on time;

[0045] A control module is provided, and when the control module detects that the modulation module outputs electric energy to the LED lamp, the shunt branch is controlled to be turned on and the overcurrent protection branch is turned off;

[0046] When the LED lamp, the modulation module and the control module are all working, the constant current source inputs a constant current, the overcurrent protection branch is turned on, the modulation module detects its own output power and sends a high-level second detection signal to the control module, and the control module sends a high-level switch control signal based on the high-level second detection signal to control the shunt branch to be turned on and the overcurrent protection branch to be turned off;

[0047] When the LED lamp fails during the start-up process, the constant current source inputs a constant current, the overcurrent protection branch is turned on, the second detection signal sent by the modulation module is low level, and the control module sends a low level switch control signal based on the low level second detection signal, so as to maintain the overcurrent protection branch turned on and disconnect it based on the current size and the power-on time, and the shunt branch is disconnected;

[0048] When the LED lamp fails during use, the constant current source inputs a constant current, the shunt branch is turned on, the second detection signal sent by the modulation module changes from a high level to a low level, the control module detects the low-level second detection signal and sends a low-level switch control signal, controls the overcurrent protection branch to be turned on and turned off based on the current size and power-on time, and the shunt branch is disconnected;

[0049] When the modulation module fails during the start-up process, the constant current source inputs a constant current, the overcurrent protection branch is turned on, the modulation module sends a low-level second detection signal or does not send a second detection signal, the control module sends a low-level switch control signal or does not send a switch control signal, the overcurrent protection branch is continuously turned on and disconnected based on the current size and the power-on time, and the shunt branch is continuously disconnected;

[0050] When the modulation module fails during use, the constant current source inputs a constant current, the shunt branch is turned on, the second detection signal sent by the modulation module changes from a high level to a low level or does not send the second detection signal, the control module sends a low-level switch control signal or does not send a switch control signal, so that the overcurrent protection branch is turned on and disconnected based on the current size and the power-on time, and the shunt branch is disconnected;

[0051] When the control module fails during the startup process, the constant current source inputs a constant current, the overcurrent protection branch is turned on, the modulation module sends a high-level second detection signal, the control module sends a low-level switch control signal or does not send a switch control signal, the overcurrent protection branch is continuously turned on and disconnected based on the current size and power-on time, and the shunt branch is continuously disconnected;

[0052] When the control module fails during use, the constant current source inputs a constant current, the shunt branch is turned on, the modulation module sends a high-level second detection signal, and the control module sends a low-level switch control signal or does not send a switch control signal, so that the overcurrent protection branch is continuously turned on and disconnected based on the current size and power-on time, and the shunt branch is continuously disconnected.

[0053] In summary, the present application includes at least one of the following beneficial technical effects:

[0054] 1. The present application realizes that when a fault of the LED lamp cannot be detected or a control signal cannot be issued, an open circuit can still be provided when a fault occurs in either the drive system or the LED lamp, thereby avoiding the risks brought by potential detection blind spots.

[0055] 2. The first detection signal is sent to the main control system, which can be analyzed to determine whether it is the LED lamp failure, or the modulation module and the control module failure, which is more convenient for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is a connection diagram of a navigation lighting system capable of performing fault open circuit detection in an embodiment of the present application.

[0057] Figure 2 It is a circuit diagram of a navigation lighting system capable of performing fault open circuit detection in an embodiment of the present application.

[0058] Description of reference numerals:

[0059] 1. Constant current source; 2. Overcurrent protection branch; 21. Thermal fuse; 3. Shunt branch; 4. Drive module; 41. Modulation module; 42. Control module; 5. Output detection module; 6. Relay; 61. Relay coil; 62. Single-pole double-throw switch; 621. First contact; 622. Second contact; 7. LED lamp. DETAILED DESCRIPTION

[0060] The present application is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0061] In the following description, for the purpose of explanation, many specific details are set forth in order to provide a thorough understanding of the inventive concept. As part of this specification, some of the drawings in the drawings of the present disclosure represent structures and devices in the form of block diagrams to avoid making the disclosed principles complicated and difficult to understand. For the sake of clarity, not all features of the actual implementation are necessarily described. References to "one specific implementation" or "specific implementations" in this disclosure mean that the specific features, structures, or characteristics described in conjunction with the specific implementation are included in at least one specific implementation, and multiple references to "one specific implementation" or "specific implementations" should not be understood as necessarily all referring to the same specific implementation.

[0062] Unless expressly limited, the terms "a", "an", and "the" are not intended to refer to a singular entity, but rather to include general categories of which specific examples may be used for illustration. Thus, the use of the terms "a" or "an" may mean any number of at least one, including "one", "one or more", "at least one", and "one or more than one". The term "or" means any of the alternatives and any combination of the alternatives, including all alternatives, unless the alternatives are expressly indicated to be mutually exclusive. The phrase "at least one of" when combined with a list of items refers to a single item in the list or any combination of the items in the list. The phrase does not require all of the listed items unless expressly limited to that.

[0063] The present application embodiment discloses a navigation lighting system capable of detecting open circuit faults. Figure 1A navigation lighting system capable of performing fault open circuit detection includes a constant current source 1, an overcurrent protection branch 2, a shunt branch 3, a driving module 4 and an LED lamp 7. The constant current source 1 is used to provide a constant current. The output voltage of the constant current source 1 changes based on whether the driving module 4 and the LED lamp 7 are on or off. The input end of the overcurrent protection branch 2 is connected to the constant current source 1. The overcurrent protection branch 2 is provided with a first enable end for obtaining a switch control signal. The overcurrent protection branch 2 is normally on and can be disconnected based on the switch control signal, and can also be disconnected based on the current size and the power-on time. The input end of the shunt branch 3 is connected to the constant current source 1. The shunt branch 3 is provided with a second enable end for obtaining a switch control signal. The shunt branch 3 is normally off and can be turned on based on the switch control signal. The driving module 4 is used to control the power output to the LED lamp 7 and send a switch control signal. The driving module 4 includes a modulation module 41 and a control module 42. Specifically, the input end of the modulation module 41 is simultaneously connected to the output end of the overcurrent protection branch 2 and the output end of the shunt branch 3. The modulation module 41 controls the power output based on the modulation control signal and generates a second detection signal based on the output current. The control module 42 is connected to the modulation module 41 and outputs the modulation control signal. The control module 42 sends a switch control signal based on the second detection signal. The LED lamp 7 is connected to the output end of the driving module 4 and works based on the power output by the driving module 4.

[0064] When the LED lamp 7, the modulation module 41 and the control module 42 are all working, the constant current source 1 inputs a constant current, the overcurrent protection branch 2 is in the on state, and the shunt branch 3 is in the off state, the modulation module 41 detects its own output electric energy, generates and sends a high-level second detection signal to the control module 42 based on the detection result, and the control module 42 sends a high-level switch control signal based on the received high-level second detection signal, and the second enable terminal on the shunt branch 3 receives the high-level switch control signal to make the shunt branch 3 conductive and the overcurrent protection branch 2 disconnected;

[0065] When the LED lamp 7 fails during the start-up process, the constant current source 1 inputs a constant current, the overcurrent protection branch 2 is in the on state, and the shunt branch 3 is in the off state. The modulation module 41 detects its own output power, generates a low-level second detection signal based on the detection result and sends it to the control module 42. The control module 42 sends a low-level switch control signal based on the low-level second detection signal. The first enable terminal on the overcurrent protection branch 2 receives the low-level switch control signal, so that the overcurrent protection branch 2 is continuously turned on and is disconnected based on the current size and the power-on time, and the shunt branch 3 remains in the off state;

[0066] When the LED lamp 7 fails during use, the constant current source 1 inputs a constant current, the shunt branch 3 is turned on, the modulation module 41 detects its own output power, and the second detection signal sent to the control module 42 changes from a high level to a low level. The control module 42 detects the low-level second detection signal and sends a low-level switch control signal. The first enable terminal on the overcurrent protection branch 2 receives the low-level switch control signal to turn on the overcurrent protection branch 2 and disconnect it based on the current size and the power-on time. Similarly, the shunt branch 3 is disconnected.

[0067] When the modulation module 41 fails during the start-up process, the constant current source 1 inputs a constant current, the overcurrent protection branch 2 is turned on, and the shunt branch 3 is disconnected. The modulation module 41 sends a low-level second detection signal due to the fault or cannot send the second detection signal due to the fault, resulting in the control module 42 receiving a low-level second detection signal sent by mistake or being unable to receive the second detection signal. Therefore, the control module 42 sends a low-level switch control signal or does not send a switch control signal, and then two situations occur, namely, the first enable end of the overcurrent protection branch 2 receives a low-level switch control signal and turns on, or the first enable end and the second enable end cannot receive the switch control signal and the overcurrent protection branch 2 is continuously turned on. Similarly, the shunt branch 3 is continuously disconnected;

[0068] When the modulation module 41 fails during use, the constant current source 1 inputs a constant current, the shunt branch 3 is turned on, and the overcurrent protection branch 2 is disconnected. The second detection signal sent by the modulation module 41 changes from a high level to a low level or fails to send the second detection signal due to the failure, which causes the control module 42 to receive a low-level second detection signal sent by mistake or fails to receive the second detection signal. The control module 42 sends a low-level switch control signal or does not send a switch control signal, and then two situations occur, namely, the first enable end of the overcurrent protection branch 2 receives a low-level switch control signal and turns on, or the first enable end and the second enable end cannot receive the switch control signal, so that the normally-on overcurrent protection branch 2 is turned on and disconnected based on the current size and the power-on time. Similarly, the shunt branch 3 is disconnected;

[0069] When the control module 42 fails during the start-up process, the constant current source 1 inputs a constant current, the overcurrent protection branch 2 is turned on, and the shunt branch 3 is disconnected. The modulation module 41 can send a high-level second detection signal, but at this time the control module 42 sends a low-level switch control signal or cannot send a switch control signal due to the fault, and then two situations occur, that is, the first enable end of the overcurrent protection branch 2 receives a low-level switch control signal and turns on, or the first enable end and the second enable end cannot receive the switch control signal, so that the overcurrent protection branch 2 is continuously turned on and disconnected based on the current size and the power-on time. Similarly, the shunt branch 3 is continuously disconnected;

[0070] When the control module 42 fails during use, the constant current source 1 inputs a constant current, the shunt branch 3 is turned on, the overcurrent protection branch 2 is disconnected, the modulation module 41 can send a high-level second detection signal, and the control module 42 sends a low-level switch control signal or cannot send a switch control signal due to the fault, and then two situations occur, namely, the first enable end of the overcurrent protection branch 2 receives a low-level switch control signal and turns on, or both the first enable end and the second enable end cannot receive the switch control signal, so that the normally on overcurrent protection branch 2 is turned on and disconnected based on the current size and the power-on time. Similarly, the shunt branch 3 is disconnected.

[0071] Therefore, when the LED lamp 7 fails, since the overcurrent protection branch 2 can be disconnected based on the current size and the power-on time, the control module 42 controls the overcurrent protection branch 2 to be turned on to provide an open circuit; when the modulation module 41 or the control module 42 fails, since the overcurrent protection branch 2 is always on, the control module 42 cannot send a switch control signal to control the overcurrent protection branch 2 to be disconnected, and an open circuit can also be provided. Therefore, the present application realizes that when a problem occurs in the equipment for detecting LED fault conditions, causing the CPU to be unable to control the open circuit module to provide an open circuit, although the fault condition of the LED lamp 7 cannot be detected or the control signal cannot be sent, it can still provide an open circuit when any one of the modulation module 41, the control module 42 or the LED lamp 7 fails, thereby avoiding the risks brought by potential detection blind spots.

[0072] In different embodiments, the overcurrent protection branch 2 can be opened in different ways to ensure circuit safety. As an example, the overcurrent protection branch 2 includes a thermal fuse 21, which can be melted when the temperature rises to a temperature exceeding the rated temperature. After the overcurrent protection branch 2 is turned on for a period of time, the temperature of the thermal fuse 21 will continue to rise. When the temperature rises to a temperature exceeding the rated temperature, the fuse in the thermal fuse 21 will melt, so that the overcurrent protection branch 2 where the thermal fuse 21 is located changes from a conducting state to an open state.

[0073] In different embodiments, the on and off of the overcurrent protection branch 2 and the shunt branch 3 can be realized in different ways. The present application specifically but not limitingly provides the following scheme: a first switch is provided on the overcurrent protection branch 2, and a first enable terminal for obtaining a switch control signal is formed on the first switch; a second switch is provided on the shunt branch 3, and a second enable terminal for obtaining a switch control signal is formed on the second switch. The first enable terminal and the second enable terminal are both ports for receiving switch control signals. When the first enable terminal and the second enable terminal do not receive the switch control signal, the first switch will remain in a closed state and the second switch will remain in an open state; when the switch control signal is at a low level, the first enable terminal will control the first switch to close, so that the overcurrent protection branch 2 is turned on and disconnected based on the current size and the power-on time, and the second enable terminal will control the second switch to disconnect so that the shunt branch 3 is disconnected; when the switch control signal is at a high level, the first enable terminal will control the first switch to disconnect so that the shunt branch 3 is turned on, and the second enable terminal will control the second switch to close so that the overcurrent protection branch 2 is disconnected.

[0074] In addition, the present application specifically but not restrictively provides another solution: the above-mentioned navigation lighting system capable of detecting open circuit faults also includes a relay 6, which is connected to the control module 42, and includes a relay coil 61 and a single-pole double-throw switch 62. The end of the overcurrent protection branch 2 away from the constant current source 1 forms a first contact 621 of the single-pole double-throw switch 62, and the end of the shunt branch 3 away from the constant current source 1 forms a second contact 622 of the single-pole double-throw switch 62. An enable terminal is provided on the relay coil 61, and the enable terminal is used to obtain a switch control signal. The relay coil 61 controls the switching of the single-pole double-throw switch 62 based on the switch control signal. When the switch control signal is sent to the enable terminal of the relay coil 61, the relay coil 61 will control the switching of the single-pole double-throw switch 62 based on the switch control signal, thereby controlling the on and off of the overcurrent protection branch 2 and the shunt branch 3.

[0075] Specifically, when the LED lamp 7, the control module 42 and the modulation module 41 are all working, the relay 6 is energized, the enable end receives a high-level switch control signal, the relay coil 61 controls the single-pole double-throw switch 62 to switch from the first contact 621 to the second contact 622, the shunt branch 3 is turned on and the overcurrent protection branch 2 is disconnected; when the LED lamp 7 fails, the relay 6 is energized, the enable end receives a low-level switch control signal, the relay coil 61 controls the single-pole double-throw switch 62 to switch from the second contact 622 to the first contact 621, the overcurrent protection branch 2 is turned on and disconnected based on the current size and the power-on time, At the same time, the shunt branch 3 is disconnected; when the modulation module 41 fails, the relay 6 is energized, the enable end receives a low-level switch control signal, and the relay coil 61 controls the single-pole double-throw switch 62 to switch from the second contact 622 to the first contact 621, and the overcurrent protection branch 2 is turned on and disconnected based on the current size and the power-on time, and the shunt branch 3 is disconnected at the same time; when the control module 42 fails, the relay 6 loses power, and the relay coil 61 cannot control the single-pole double-throw switch 62, so that the overcurrent protection branch 2 in the normally on state is turned on and disconnected based on the current size and the power-on time, and the shunt branch 3 in the normally off state is disconnected.

[0076] Specifically, the modulation module 41 includes a modulation unit and a detection unit. The modulation unit controls the output of electric energy based on the modulation control signal, and the detection unit generates a second detection signal based on the current output by itself. Since the LED lamp 7 and the constant current source 1 system of the airport do not match, a modulation unit is required to convert the input electric energy into electric energy compatible with the LED lamp 7. When the modulation unit transmits the converted electric energy to the LED lamp 7, the detection unit will detect the above electric energy and generate a second detection signal. The second detection signal will be sent to the control unit for analyzing whether the LED lamp 7 is faulty.

[0077] In order to further determine the specific location where the fault occurs, the present application specifically but not restrictively proposes a solution: the above-mentioned navigation lighting system capable of detecting open circuit faults also includes an output detection module 5, which is used to detect the output voltage of the constant current source 1 and output a first detection signal, and the first detection signal is used to obtain the output voltage change of the constant current source 1 for the main control system. Since the resistance values ​​of the LED lamp 7 and the driving module 4 are different and connected in parallel, the current input to the constant current source 1 remains constant. Therefore, when any one of the LED lamp 7 or the driving module 4 fails and opens the circuit, the output voltage of the constant current source 1 will change differently. By judging the voltage change through the first detection signal, the location of the fault can be determined; when a short circuit occurs, the voltage at the output end of the constant current source 1 will drop to 0 volts, so this situation can also be determined through the first detection signal.

[0078] The present application also provides a method for detecting an open circuit fault in a navigation light, comprising the following steps:

[0079] A constant current source 1 is provided for inputting a constant current, wherein the constant current is used to provide electric energy to a modulation module 41, the modulation module 41 is used to control the output of electric energy, and a power output end of the modulation module 41 is electrically connected to an LED lamp 7;

[0080] Overcurrent protection branch 2 and overcurrent protection branch 2 are set in parallel as a connection channel from constant current source 1 to modulation module 41, wherein shunt branch 3 is normally disconnected; overcurrent protection branch 2 is normally connected and can be disconnected based on the current size and power-on time;

[0081] A control module 42 is provided, and when the control module 42 detects that the modulation module 41 outputs electric energy to the LED lamp 7, the shunt branch 3 is controlled to be turned on and the overcurrent protection branch 2 is turned off;

[0082] When the LED lamp 7, the modulation module 41 and the control module 42 are all working, the constant current source 1 inputs a constant current, the overcurrent protection branch 2 is turned on, the modulation module 41 detects its own output power and sends a high-level second detection signal to the control module 42, and the control module 42 sends a high-level switch control signal based on the high-level second detection signal to control the shunt branch 3 to be turned on and the overcurrent protection branch 2 to be turned off;

[0083] When the LED lamp 7 fails during the start-up process, the constant current source 1 inputs a constant current, the overcurrent protection branch 2 is turned on, the second detection signal sent by the modulation module 41 is low level, and the control module 42 sends a low level switch control signal based on the low level second detection signal, so as to maintain the overcurrent protection branch 2 turned on and disconnect it based on the current size and the power-on time, and the shunt branch 3 is disconnected;

[0084] When the LED lamp 7 fails during use, the constant current source 1 inputs a constant current, the shunt branch 3 is turned on, the second detection signal sent by the modulation module 41 changes from a high level to a low level, the control module 42 detects the low-level second detection signal and sends a low-level switch control signal, controls the overcurrent protection branch 2 to be turned on and turned off based on the current size and the power-on time, and the shunt branch 3 is turned off;

[0085] When the modulation module 41 fails during the start-up process, the constant current source 1 inputs a constant current, the overcurrent protection branch 2 is turned on, the modulation module 41 sends a low-level second detection signal or does not send a second detection signal, the control module 42 sends a low-level switch control signal or does not send a switch control signal, the overcurrent protection branch 2 is continuously turned on and disconnected based on the current size and the power-on time, and the shunt branch 3 is continuously disconnected;

[0086] When the modulation module 41 fails during use, the constant current source 1 inputs a constant current, the shunt branch 3 is turned on, the second detection signal sent by the modulation module 41 changes from a high level to a low level or does not send the second detection signal, and the control module 42 sends a low-level switch control signal or does not send a switch control signal, so that the overcurrent protection branch 2 is turned on and disconnected based on the current size and the power-on time, and the shunt branch 3 is disconnected;

[0087] When the control module 42 fails during the start-up process, the constant current source 1 inputs a constant current, the overcurrent protection branch 2 is turned on, the modulation module 41 sends a high-level second detection signal, the control module 42 sends a low-level switch control signal or does not send a switch control signal, the overcurrent protection branch 2 is continuously turned on and disconnected based on the current size and the power-on time, and the shunt branch 3 is continuously disconnected;

[0088] When the control module 42 fails during use, the constant current source 1 inputs a constant current, the shunt branch 3 is turned on, the modulation module 41 sends a high-level second detection signal, and the control module 42 sends a low-level switch control signal or does not send a switch control signal, so that the overcurrent protection branch 2 is continuously turned on and disconnected based on the current size and the power-on time, and the shunt branch 3 is continuously disconnected.

[0089] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A navigation lighting system capable of detecting open circuit faults, characterized in that: include: A constant current source (1), used for providing a constant current; An overcurrent protection branch (2), the input end of which is connected to the constant current source (1), the overcurrent protection branch (2) being provided with a first enabling end for obtaining a switch control signal, the overcurrent protection branch (2) being normally on, capable of being disconnected based on the switch control signal, and capable of being disconnected based on the magnitude of the passing current and the duration of the power-on time; A shunt branch (3), the input end of which is connected to the constant current source (1), the shunt branch (3) is provided with a second enabling end for obtaining a switch control signal, the shunt branch (3) is normally disconnected, and can be turned on based on the switch control signal; A driving module (4) and an LED lamp (7), wherein the LED lamp (7) is connected to an output end of the driving module (4) and operates based on the electric energy output by the driving module (4); The driving module (4) is used to control the output of electric energy to the LED lamp (7) and to send a switch control signal, and the driving module (4) comprises a modulation module (41) and a control module (42); The input end of the modulation module (41) is simultaneously connected to the output end of the overcurrent protection branch (2) and the output end of the shunt branch (3); the modulation module (41) controls the output of electric energy based on a modulation control signal, and generates a second detection signal based on the output current; The control module (42) is connected to the modulation module (41) and outputs a modulation control signal, and the control module (42) sends a switch control signal based on the second detection signal; When the LED lamp (7), the control module (42) and the modulation module (41) are all working, the shunt branch (3) is turned on and the overcurrent protection branch (2) is turned off; when the LED lamp (7) fails, the overcurrent protection branch (2) is turned on and turned off based on the magnitude of the passing current and the duration of the power-on, and the shunt branch (3) is turned off; when the modulation module (41) fails, the overcurrent protection branch (2) is turned on and turned off based on the magnitude of the passing current and the duration of the power-on, and the shunt branch (3) is turned off; when the control module (42) fails, the overcurrent protection branch (2) in the normally-on state is turned on and turned off based on the magnitude of the passing current and the duration of the power-on, and the shunt branch (3) in the normally-off state is turned off; The output voltage of the constant current source (1) changes based on whether the driving module (4) and the LED lamp (7) are on or off.

2. The navigation lighting system capable of detecting open circuit failure according to claim 1, characterized in that: The overcurrent protection branch (2) comprises a thermal fuse (21), and the thermal fuse (21) melts when the temperature rises to exceed the rated temperature.

3. The navigation lighting system capable of detecting open circuit failure according to claim 1, characterized in that: The overcurrent protection branch (2) is provided with a first switch, and the first switch is provided with the first enabling terminal for obtaining a switch control signal.

4. The navigation lighting system capable of detecting open circuit failure according to claim 3, characterized in that: The shunt branch (3) is provided with a second switch, and the second switch is provided with a second enable terminal for obtaining a switch control signal.

5. The navigation lighting system capable of detecting open circuit failure according to claim 4, characterized in that: The invention also comprises a relay (6), wherein the relay (6) is connected to the control module (42), the relay (6) comprises a relay coil (61) and a single-pole double-throw switch (62), a first contact (621) of the single-pole double-throw switch (62) is formed at one end of the overcurrent protection branch (2) away from the constant current source (1), a second contact (622) of the single-pole double-throw switch (62) is formed at one end of the shunt branch (3) away from the constant current source (1), an enable terminal for controlling the on and off of the relay coil (61) is provided, the enable terminal comprises the first enable terminal and the second enable terminal, and the relay coil (61) controls the switching of the single-pole double-throw switch (62) based on a switch control signal.

6. The navigation lighting system capable of detecting open circuit failure according to claim 1, characterized in that: The modulation module (41) comprises: a modulation unit, wherein the modulation unit controls the output of electric energy based on a modulation control signal; The detection unit generates a second detection signal based on the current output by the detection unit.

7. The navigation lighting system capable of detecting open circuit failure according to claim 1, characterized in that: The modulation module (41) cooperates with the control module (42) to form a driving module (4), and the driving module (4) is used to control the output of electric energy to the LED lamp (7) and to send a switch control signal.

8. The navigation lighting system capable of detecting open circuit failure according to claim 7, characterized in that: It also includes an output detection module (5), which is used to detect the output voltage of the constant current source (1) and output a first detection signal, wherein the first detection signal is used for the main control system to obtain the output voltage change of the constant current source (1).

9. A method for detecting an open circuit fault in a navigation light, characterized in that: The following steps are involved: A constant current source (1) is provided for inputting a constant current, wherein the constant current is used to provide electric energy to a modulation module (41), the modulation module (41) is used to control the output of electric energy, and a power output end of the modulation module (41) is electrically connected to an LED lamp (7); An overcurrent protection branch (2) and an overcurrent protection branch (2) are arranged in parallel as a connection channel between the constant current source (1) and the modulation module (41), wherein the shunt branch (3) is normally disconnected; the overcurrent protection branch (2) is normally connected and can be disconnected based on the magnitude of the passing current and the duration of the power-on time; A control module (42) is provided, and when the control module (42) detects that the modulation module (41) outputs electric energy to the LED lamp (7), the control module (42) controls the shunt branch (3) to be turned on and the overcurrent protection branch (2) to be turned off; When the LED lamp (7), the modulation module (41) and the control module (42) are all working, the constant current source (1) inputs a constant current, the overcurrent protection branch (2) is turned on, the modulation module (41) detects its own output electric energy and sends a high-level second detection signal to the control module (42), and the control module (42) sends a high-level switch control signal based on the high-level second detection signal to control the shunt branch (3) to be turned on and the overcurrent protection branch (2) to be turned off; When the LED lamp (7) fails during the start-up process, the constant current source (1) inputs a constant current, the overcurrent protection branch (2) is turned on, the second detection signal emitted by the modulation module (41) is at a low level, and the control module (42) emits a low-level switch control signal based on the low-level second detection signal, so as to maintain the overcurrent protection branch (2) turned on and disconnect it based on the current size and the power-on time, and the shunt branch (3) is disconnected; When the LED lamp (7) fails during use, the constant current source (1) inputs a constant current, the shunt branch (3) is turned on, the second detection signal emitted by the modulation module (41) changes from a high level to a low level, the control module (42) detects the low-level second detection signal and emits a low-level switch control signal, controls the overcurrent protection branch (2) to be turned on and turned off based on the current size and the power-on time, and the shunt branch (3) is turned off; When the modulation module (41) fails during the start-up process, the constant current source (1) inputs a constant current, the overcurrent protection branch (2) is turned on, the modulation module (41) sends a low-level second detection signal or does not send a second detection signal, the control module (42) sends a low-level switch control signal or does not send a switch control signal, the overcurrent protection branch (2) is continuously turned on and is disconnected based on the current size and the power-on time, and the shunt branch (3) is continuously disconnected; When the modulation module (41) fails during use, the constant current source (1) inputs a constant current, the shunt branch (3) is turned on, the second detection signal emitted by the modulation module (41) changes from a high level to a low level or does not emit the second detection signal, and the control module (42) emits a low-level switch control signal or does not emit a switch control signal, so that the overcurrent protection branch (2) is turned on and disconnected based on the current size and the power-on time, and the shunt branch (3) is disconnected; When the control module (42) fails during the start-up process, the constant current source (1) inputs a constant current, the overcurrent protection branch (2) is turned on, the modulation module (41) sends a high-level second detection signal, the control module (42) sends a low-level switch control signal or does not send a switch control signal, the overcurrent protection branch (2) is continuously turned on and is disconnected based on the current size and the power-on time, and the shunt branch (3) is continuously disconnected; When the control module (42) fails during use, the constant current source (1) inputs a constant current, the shunt branch (3) is turned on, the modulation module (41) sends a high-level second detection signal, and the control module (42) sends a low-level switch control signal or does not send a switch control signal, so that the overcurrent protection branch (2) is continuously turned on and disconnected based on the current size and the power-on time, and the shunt branch (3) is continuously disconnected.

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