Vehicle lamp and light-emitting element fault detection device thereof

Abstract

The utility model relates to a vehicle lamp and a light-emitting element fault detection device thereof. The device comprises a power supply connecting end, N light-emitting modules, N fault detection modules and a control module, each light-emitting module is connected with the power supply connecting end, each light-emitting module is connected with each corresponding fault detection module, and each fault detection module is further connected with the control module; each fault detection module is used for detecting the output detection voltage and transmitting the detection voltage to the control module; the control module is used for judging whether a light-emitting element in the light-emitting module corresponding to the detection voltage fails or not according to whether the detection voltage is larger than a voltage preset value or not. According to the device, each light-emitting module is connected with one fault detection module, and the control module judges whether the light-emitting elements in the light-emitting modules are damaged or not according to the detection voltage output by the fault detection modules, so that the damage of the light-emitting elements in the vehicle lamp is detected; the device is simple in structure, and reduces the lamp damage detection cost of the light-emitting module.

Description

Technical Field

[0001] This application belongs to the technical field of lamp detection, and particularly relates to a vehicle lamp and a failure detection device for its light-emitting elements. Background Art

[0002] With the development of society, users' requirements for automotive functional safety have gradually increased. Among them, brake lights and turn signals, as important indicators of automobiles, play a crucial role in the safe driving of automobiles. When the brake lights and turn signals malfunction, if they cannot be promptly feedback to the cab, it will seriously affect the driver's life safety. It is required that when one lamp bead in the vehicle lamp goes out, the remaining lamp beads should still be able to emit light normally and meet the regulatory requirements. Therefore, it is impossible to design all the light-emitting elements of the vehicle lamp in series.

[0003] Existing detection methods for the light-emitting elements of vehicle lamps adopt a matrix method or a combination of multi-channel constant current and multi-channel AD monitoring. Such detection methods for the light-emitting elements of vehicle lamps require a lot of single-chip microcomputer AD resources and multiple constant current circuits, and the circuit of this detection method will become complex, occupying a large space area, which is not conducive to the design of its circuit board. Utility Model Content

[0004] An embodiment of this application provides a vehicle lamp and a failure detection device for its light-emitting elements to solve the problems of the prior art.

[0005] In a first aspect, an embodiment of this application provides a failure detection device for light-emitting elements, including a power connection end, N light-emitting modules, N failure detection modules, and a control module;

[0006] The power connection end is connected to a first power supply. The input end of each light-emitting module is connected to the power connection end, the output end of each light-emitting module is connected to the corresponding failure detection module, and each failure detection module is also connected to the control module;

[0007] Each light-emitting module includes several light-emitting elements connected in series;

[0008] Each failure detection module is used to detect the output detection voltage and transmit the detection voltage to the control module;

[0009] The control module is used to determine whether the light-emitting elements in the light-emitting module corresponding to the detection voltage are faulty according to whether the detection voltage is greater than the voltage preset value.

[0010] Optionally, each of the fault detection modules includes a first detection connection terminal, a detection resistor, and a semiconductor element. The first detection connection terminal is connected to the output terminal of the light-emitting module. The first end of the detection resistor is connected to the first detection connection terminal, the second end of the detection resistor is grounded, the first end of the semiconductor element is connected to the first detection connection terminal, the second end of the semiconductor element is connected to a second detection connection terminal, and the second detection connection terminal is also connected to the control module.

[0011] Optionally, each of the fault detection modules further includes a detection capacitor, and the detection capacitor is connected in parallel between the first detection connection terminal and the second detection connection terminal.

[0012] Optionally, the second detection connection terminal is also connected to a second power supply in series with an eleventh resistor.

[0013] Optionally, the semiconductor element is a diode.

[0014] Optionally, each of the light-emitting elements is further connected in parallel with a protection element for preventing voltage mutation.

[0015] Optionally, the protection element is a capacitor.

[0016] Optionally, the light-emitting element is a halogen lamp, a xenon lamp, an LED lamp, or a laser lamp.

[0017] Optionally, the control module includes a single-chip microcomputer or a microprocessing unit.

[0018] In a second aspect, an embodiment of the present application provides a vehicle lamp, including the above-mentioned light-emitting element fault detection device.

[0019] The light-emitting element fault detection device includes a power connection terminal, N light-emitting modules, N fault detection modules, and a control module; the power connection terminal is connected to a first power supply, the input terminal of each light-emitting module is connected to the power connection terminal, the output terminal of each light-emitting module is connected to the corresponding one of the N fault detection modules, and each fault detection module is also connected to the control module; each light-emitting module includes several light-emitting elements connected in series; each fault detection module is configured to detect the output detection voltage and transmit the detection voltage to the control module; the control module is configured to determine whether the light-emitting elements in the light-emitting module corresponding to the detection voltage are faulty according to whether the detection voltage is greater than a voltage preset value.

[0020] An embodiment of the present application provides a light-emitting element fault detection device. By connecting a fault detection module to each light-emitting module, the fault detection module detects the detection voltage output from the corresponding light-emitting module to the control module, and the control module determines whether the light-emitting element in the light-emitting module is damaged according to the detection voltage of the fault detection module, so as to realize the detection of the damage of the light-emitting element in the vehicle lamp. The structure of the light-emitting element fault detection device is simple, which reduces the cost of detecting the damage of the light-emitting module and solves the problems of the complex detection circuit and high detection cost of the existing vehicle lamp of an automobile. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in an embodiment of the present application, the following will briefly introduce the drawings required for the description of the embodiment. Obviously, the following drawings are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative efforts.

[0022] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings. Among them, the same reference numerals in the following description represent the same parts.

[0023] Figure 1 It is a schematic framework diagram of the light-emitting element fault detection device provided by an embodiment of the present application.

[0024] Figure 2 It is a schematic circuit diagram of the light-emitting element fault detection device provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions in an embodiment of the present application in conjunction with the drawings in an embodiment of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0026] An embodiment of the present application provides a vehicle lamp and its light-emitting element fault detection device to solve the problems of the complex detection circuit and high detection cost of the existing vehicle lamp of an automobile. The vehicle lamp and its light-emitting element fault detection device can also be applied to lamps such as spotlights and daily lighting lamps.

[0027] Embodiment 1:

[0028] The light-emitting element fault detection device provided by an embodiment of the present application. Exemplarily, please refer to Figure 1 , Figure 1Schematic diagram of the framework of a light-emitting element fault detection device provided for an embodiment of the present application.

[0029] As Figure 1 shown, the present utility model provides a light-emitting element fault detection device for a vehicle headlight lamp, including a power connection terminal POWER, N light-emitting modules 10, N fault detection modules 20, and a control module 30;

[0030] The power connection terminal POWER is connected to a first power source. The input terminal of each light-emitting module 10 is connected to the power connection terminal POWER, the output terminal of each light-emitting module 10 is connected to the corresponding each fault detection module 20, and each fault detection module 20 is also connected to the control module 30;

[0031] Each light-emitting module 10 includes several light-emitting elements connected in series;

[0032] Each fault detection module 20 is used to detect the output detection voltage and transmit the detection voltage to the control module 30;

[0033] The control module 30 is used to judge whether the light-emitting elements in the light-emitting module 10 corresponding to the detection voltage are faulty according to whether the detection voltage is greater than the voltage preset value.

[0034] Further explanation is that the voltage preset value is set by the user according to the voltage output when the light-emitting module 10 works normally and the voltage output when the light-emitting module 10 works abnormally. The voltage setting value can be set according to the actual situation. Each light-emitting module 10 is connected to a fault detection module 20, and N is a natural number not equal to 0. The first power source can be selected as the commercial power. In this embodiment, the light-emitting element fault detection device realizes the detection of whether the corresponding light-emitting module 10 fails through the detection voltage output by the fault detection module 20. According to the fault detection module 20 connected to each light-emitting module 10, the light-emitting element fault detection device realizes the detection of the lamp failure of the light-emitting elements in the vehicle headlight lamp. Under the requirement of realizing the same function, not only the circuit is made simple, but also the material and management costs of the vehicle headlight lamp are reduced.

[0035] Further explanation is that the control module 30 includes a single-chip microcomputer U2D or a microprocessing unit. The single-chip microcomputer or the microprocessing unit can judge whether the light-emitting elements in the light-emitting module 10 are damaged according to the detection voltage of the fault detection module 20, so as to realize the detection of the lamp failure of the light-emitting elements in the vehicle headlight lamp. In this embodiment, the technology that the single-chip microcomputer or the microprocessing unit judges whether the light-emitting elements in the light-emitting module 10 corresponding to the detection voltage are faulty according to whether the detection voltage is greater than the voltage preset value is a relatively mature technology in this field, and will not be repeated in this embodiment.

[0036] The light-emitting element failure detection device provided by an embodiment of the present application includes: a power connection terminal, N light-emitting modules, N failure detection modules, and a control module; the power connection terminal is connected to a first power supply, the input end of each light-emitting module is connected to the power connection terminal, the output end of each light-emitting module is connected to the corresponding failure detection module, and each failure detection module is also connected to the control module; each light-emitting module includes several light-emitting elements connected in series; each failure detection module is used to detect the output detection voltage and transmit the detection voltage to the control module; the control module is used to judge whether the light-emitting elements in the light-emitting module corresponding to the detection voltage are faulty according to whether the detection voltage is greater than the voltage preset value. The light-emitting element failure detection device realizes the detection of the failure of the light-emitting elements in the vehicle lamp by connecting a failure detection module to each light-emitting module. The failure detection module detects the detection voltage output from the corresponding light-emitting module to the control module, and the control module judges whether the light-emitting elements in the light-emitting module are damaged according to the detection voltage of the failure detection module, so as to realize the detection of the failure of the light-emitting elements in the vehicle lamp; the structure of the light-emitting element failure detection device of the vehicle lamp is simple, the cost of detecting the failure of the light-emitting module is reduced, and the problems of complex detection circuit and high detection cost of the existing vehicle lamp of the automobile are solved.

[0037] Figure 2 It is a circuit schematic diagram of the light-emitting element failure detection device of the vehicle lamp provided by an embodiment of the present application.

[0038] As Figure 2 shown, in an embodiment of the present application, each light-emitting module 10 includes two light-emitting elements LED connected in series.

[0039] Further, the first end after the two light-emitting elements LED are connected in series is connected to the power connection terminal POWER, and the second end after the two light-emitting elements LED are connected in series is connected to the failure detection module 20. The light-emitting element LED can be selected as a halogen lamp, a xenon lamp, an LED lamp or a laser lamp. In this embodiment, the light-emitting element is selected as an LED lamp bead. Each light-emitting module 10 is connected in series with a failure detection module 20 for detecting whether the light-emitting element LED in each light-emitting module 10 is damaged.

[0040] As Figure 2 shown, in an embodiment of the present application, each light-emitting element LED is further connected in parallel with a protection element C for preventing voltage mutation.

[0041] Further, the protection component C can be selected as a capacitor. In this embodiment, the protection component C helps to smooth the current flow for the light-emitting component LED and helps to limit the instantaneous large current at the initial power-on of the first power supply in the power connection terminal POWER, namely the so-called inrush current. By connecting the protection component C in parallel with each light-emitting component LED in the light-emitting module 10, the characteristics of using a capacitor as the protection component C, that is, passing alternating current and blocking direct current, and the characteristic that its voltage does not change suddenly, can be utilized to quickly absorb and disperse the extra current at the moment of power-on. Thus, the light-emitting component LED can work under a relatively stable current, and thus emit light more safely and reliably. The protection component C can also play a certain voltage stabilizing role. Especially in the light-emitting module 10 with resistor-capacitor step-down, by the cooperation of the power frequency and the capacitance size, the current passing through the light-emitting component can be limited, so as to stabilize the working voltage of the light-emitting component to a certain extent, and it can indeed provide a simple and effective way to protect the light-emitting component and avoid damage due to excessive current.

[0042] As Figure 2 shown, in an embodiment of the utility model of the present application, each fault detection module includes a first detection connection terminal TIn, a detection resistor Rn, and a semiconductor component Dn. The first detection connection terminal TIn is connected to the output terminal of the light-emitting module 10. The first end of the detection resistor Rn is connected to the first detection connection terminal TIn, the second end of the detection resistor Rn is grounded, the first end of the semiconductor component Dn is connected to the first detection connection terminal TIn, the second end of the semiconductor component Dn is connected to the second detection connection terminal ERRIN, and the second detection connection terminal ERRIN is also connected to the control module 30.

[0043] Further, n = 1, 2,......, N. The semiconductor element Dn can be selected as a diode. The light-emitting element failure detection device connects a failure detection module 20 composed of a detection resistor Rn and a semiconductor element Dn in series in each light-emitting module 10. When all the light-emitting elements in the light-emitting module 10 are working normally, the failure detection module 20 outputs a detection voltage greater than the voltage preset value from the second detection connection end ERRIN and transmits the detection voltage to the control module 30; when at least one light-emitting element in the light-emitting module 10 fails, the failure detection module 20 outputs a detection voltage less than the voltage preset value from the second detection connection end ERRIN and transmits the detection voltage to the control module 30. Thus, the control module 30 can compare the detection voltage detected by the failure detection module 20 with the voltage preset value to determine whether the light-emitting elements in the light-emitting module 10 are faulty (such as a broken lamp), thereby realizing the detection of broken lamps of the light-emitting elements in the light-emitting module 10. In this embodiment, if the detection resistor Rn is selected as a resistor with a resistance value of 3.6R and a constant current is input at the power connection end POWER, when the light-emitting module 10 is working normally, a voltage of 1.5V will be generated on the detection resistor Rn. However, the detection voltage output from the second detection connection end ERRIN is approximately 2V, which is 1.5V plus the voltage of the semiconductor element Dn. At the same time, the detection voltage output from the second detection connection end ERRIN will be fed back to the control module 30. When the light-emitting element in the light-emitting module 10 is damaged (such as a broken lamp), the detection voltage output from the second detection connection end ERRIN will drop to 0.5V and be recognized by the control module 30.

[0044] As Figure 2 shown, in an embodiment of the utility model of the present application, each failure detection module 20 further includes a detection capacitor, and the detection capacitor is connected in parallel between the first detection connection end TIn and the second detection connection end ERRIN.

[0045] Further, the detection capacitor can be selected as a capacitor with a capacitance of 10nF. A detection capacitor is connected in parallel at both ends of each semiconductor element Dn. In this embodiment, the detection capacitor is used to remove the voltage ripple in the semiconductor element Dn and stabilize the voltage of the semiconductor element Dn.

[0046] As Figure 2 shown, in an embodiment of the utility model of the present application, the second detection connection end ERRIN is also connected in series with an eleventh resistor R11 to the second power supply.

[0047] Further, the second power supply can be selected as a 5V direct current, and the eleventh resistor R11 can be selected as a resistor with a resistance of 1K. In this embodiment, the second power supply is used to supply power to the control module 10. The eleventh resistor R11 is used to divide the voltage and limit the current of the power supply provided by the second power supply to ensure the stability of the operation of the control module 10.

[0048] Embodiment 2:

[0049] The utility model of the present application provides a vehicle lamp, including the above-mentioned light-emitting element fault detection device.

[0050] Further, the content of the light-emitting element fault detection device has been described in Embodiment 1, and will not be repeated in this embodiment.

[0051] In the embodiment of the utility model of the present application, the vehicle lamp detects whether the corresponding light-emitting module 10 fails through the detection voltage output by the fault detection module 20 of the light-emitting element fault detection device. Specifically, the vehicle lamp connects a fault detection module to each light-emitting module through the light-emitting element fault detection device. The fault detection module detects the detection voltage output from the corresponding light-emitting module to the control module. The control module 30 determines whether the light-emitting element in the light-emitting module 10 fails or the lamp is damaged according to the detection voltage output by the fault detection module 20 connected to each light-emitting module 10, so that the light-emitting element fault detection device realizes the detection of the damaged light-emitting element in the vehicle lamp. Under the requirement of realizing the same function, not only the circuit of the vehicle lamp becomes simple, but also the materials and management costs of the vehicle lamp are reduced.

[0052] Further, in this headlight fixture, a fault detection module 20 composed of a detection resistor Rn and a semiconductor element Dn is connected in series to each light-emitting module 10 through a light-emitting element fault detection device. When all the light-emitting elements in the light-emitting module 10 are operating normally, the fault detection module 20 outputs a detection voltage greater than the voltage preset value from the second detection connection terminal ERRIN and transmits this detection voltage to the control module 30. When at least one light-emitting element in the light-emitting module 10 fails, the fault detection module 20 outputs a detection voltage less than the voltage preset value from the second detection connection terminal ERRIN and transmits this detection voltage to the control module 30. Thus, the control module 30 can compare the detection voltage detected by the fault detection module 20 with the voltage preset value to determine whether the light-emitting elements in the light-emitting module 10 are faulty (such as a lamp being broken), thereby realizing the detection of whether the light-emitting elements in the light-emitting module 10 are broken. In this embodiment, if the detection resistor Rn is selected as a resistor with a resistance value of 3.6R and a constant current is input to the power connection terminal POWER, when the light-emitting module 10 is operating normally, a voltage of 1.5V will be generated across the detection resistor Rn. However, the detection voltage output from the second detection connection terminal ERRIN is approximately 2V, which is 1.5V plus the voltage of the semiconductor element Dn. At the same time, the detection voltage output from the second detection connection terminal ERRIN is fed back to the control module 30. When a light-emitting element in the light-emitting module 10 is damaged (such as a lamp being broken), the detection voltage output from the second detection connection terminal ERRIN will drop to 0.5V and be recognized by the control module 30.

[0053] In the above embodiments, the descriptions of the various embodiments have their own focuses. For parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0054] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0055] The above has introduced in detail the light-emitting element fault detection device of the headlight fixture provided in an embodiment of the present application. Specific examples are used herein to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. At the same time, for those skilled in the art, there will be changes in the specific implementation manner and application scope according to the idea of the present application. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A light emitting element fault detection device, characterized in that: It includes a power connection terminal, N light-emitting modules, N fault detection modules and a control module; The power connection end is connected to the first power supply, the input end of each of the light emitting modules is connected to the power connection end, the output end of each of the light emitting modules is connected to each of the corresponding fault detection modules, and each of the fault detection modules is also connected to the control module; Each of the light-emitting modules comprises a plurality of light-emitting elements connected in series; Each of the fault detection modules is used to detect an output detection voltage and transmit the detection voltage to the control module; The control module is used to determine whether the light-emitting element in the light-emitting module corresponding to the detection voltage is faulty according to whether the detection voltage is greater than a preset voltage value.

2. The light emitting element failure detection device according to claim 1, characterized in that: Each of the fault detection modules includes a first detection connection terminal, a detection resistor and a semiconductor element, wherein the first detection connection terminal is connected to the output terminal of the light-emitting module, the first end of the detection resistor is connected to the first detection connection terminal, the second end of the detection resistor is grounded, the first end of the semiconductor element is connected to the first detection connection terminal, the second end of the semiconductor element is connected to the second detection connection terminal, and the second detection connection terminal is also connected to the control module.

3. The light emitting element failure detection device according to claim 2, characterized in that: Each of the fault detection modules further includes a detection capacitor connected in parallel between the first detection connection terminal and the second detection connection terminal.

4. The light emitting element failure detection device according to claim 2, characterized in that: The second detection connection terminal is also connected in series with an eleventh resistor and is connected to the second power supply.

5. The light emitting element failure detection device according to claim 2, characterized in that: The semiconductor element is a diode.

6. The light emitting element fault detection device according to any one of claims 1 to 5, characterized in that: Each of the light-emitting elements is also connected in parallel with a protection element for preventing voltage mutation.

7. The light emitting element failure detection device according to claim 6, characterized in that: The protection element is a capacitor.

8. The light emitting element fault detection device according to any one of claims 1 to 5, characterized in that: The light emitting element is a halogen lamp, a xenon lamp, an LED lamp or a laser lamp.

9. The light emitting element fault detection device according to any one of claims 1 to 5, characterized in that: The control module includes a single chip microcomputer or a microprocessing unit.

10. A vehicle lamp, characterized in that: It comprises the light emitting element fault detection device as described in any one of claims 1-9.

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