Lighting equipment and short circuit prevention control device thereof
By designing a short-circuit control device including a control module, a switch control submodule and a short-circuit protection submodule in the lighting equipment of the car headlights, the problem of complex and high cost of anti-short circuit of the existing car headlights is solved, and the short-circuit protection effect with simple structure, low cost and fast response is achieved.
Patent Information
- Application Number
- CN202421684061.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-16
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-07-16
AI Technical Summary
Existing automotive headlights have complex and high cost, making it difficult to effectively reduce the complexity and cost of short-circuit protection.
A short-circuit control device for lighting equipment is designed, including a control module, a switch control submodule and a short-circuit protection submodule. By connecting the short-circuit protection submodule at the output end of the switch control submodule, the control module controls whether the submodule outputs the power supply based on the high and low levels feedback from the short-circuit protection submodule to achieve short-circuit protection.
The anti-short circuit control device of this lighting equipment is simple in structure, which reduces the cost of short circuit protection, increases the time of short circuit protection response, and solves the problem of complex and high cost of anti-short circuit of existing car lights.
Smart Images
Figure CN222981711U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the technical field of short - circuit prevention, and particularly relates to a lighting device and its short - circuit prevention control device. Background Art
[0002] With the development of automotive intelligence and diversification, the composition of automotive front lights and rear lights is not just the left - side lights plus the right - side lights. To make automotive lights more dazzling and beautiful, on the basis of meeting optical rules, many manufacturers will add other elements to automotive lights, such as through - lights, grille lights, LOGO lights, etc., which all have special animation effects. Then, in order to save costs and reduce the number of single - chip microcomputers for controlling lights, manufacturers will choose to place the single - chip microcomputer in one of the lights and then achieve cross - light control through wire harnesses. However, any input - output wire harness of the lights needs to pass a short - circuit test. The short - circuit test means that when the lights are working normally, the rest of the relevant wire harnesses are short - circuited to the negative or positive pole of the power supply, and then it is detected whether the functions of the lights are normal.
[0003] Currently, short - circuit protection for vehicle lights is achieved by adding a current detector at the output port. When the current increases to a certain extent, the circuit is automatically disconnected to protect relevant components. This short - circuit protection method will increase the cost of the current detection circuit, and the short - circuit prevention circuit will become complex. Summary of the Utility Model
[0004] An embodiment of this application provides a lighting device and its short - circuit prevention control device to solve the problems of complex and costly short - circuit prevention circuits in existing automotive lights.
[0005] In a first aspect, an embodiment of this application provides a short - circuit prevention control device for a lighting device, including a control module and a power output module connected to the control module. The power output module includes a switch control sub - module and a short - circuit protection sub - module connected to the output end of the switch control sub - module. The input end of the switch control sub - module is connected to a power supply, the output end of the switch control sub - module is connected to a load, and the control module is used to control whether the switch control sub - module outputs power by using high and low levels.
[0006] Optionally, the short - circuit protection sub - module includes a voltage - dividing circuit for voltage division and a filtering circuit for signal feedback. The voltage - dividing circuit is connected to the filtering circuit, and the filtering circuit is connected to the control module.
[0007] Optionally, the voltage dividing circuit includes a fifth resistor and a sixth resistor connected in series with the fifth resistor. The fifth resistor is further connected to the output terminal of the switch control sub-module, and the sixth resistor is further connected to the ground terminal. The filtering circuit includes a seventh resistor and a first capacitor. The first end of the seventh resistor is connected to the series connection node of the fifth resistor and the sixth resistor. The second end of the seventh resistor is respectively connected to the first end of the first capacitor and the signal feedback connection terminal, and the signal feedback connection terminal is used to connect to the control module. The second end of the first capacitor is connected to the ground terminal.
[0008] Optionally, the switch control sub-module includes a power input terminal, an enable connection terminal, and a power output terminal. The power input terminal is used to connect to a power supply. A constant voltage circuit is provided between the power input terminal and the power output terminal. An enable control circuit is provided between the constant voltage circuit and the enable connection terminal. The power output terminal is used to connect to the load. The short-circuit protection sub-module is provided between the power output terminal and the ground terminal. The enable connection terminal is used to connect to the control module.
[0009] Optionally, the constant voltage circuit includes a second switch tube for controlling whether to output power to the power output terminal. The second end of the second switch tube is connected to the power input terminal. The third end of the second switch tube is connected to the power output terminal. The first end of the second switch tube is connected to the enable control circuit. The first end of the second switch tube is also connected in series with a voltage stabilizing tube to the ground terminal.
[0010] Optionally, the enable control circuit includes a first switch tube for controlling whether the second switch tube is turned on. The third end of the first switch tube is connected to the first end of the second switch tube. The second end of the first switch tube is connected to the ground terminal. The first end of the first switch tube is connected to the enable connection terminal.
[0011] Optionally, a first resistor is connected in series between the enable connection terminal and the first end of the first switch tube. A second resistor is connected between the first end of the first switch tube and the ground terminal.
[0012] Optionally, a fourth resistor is connected between the second end of the second switch tube and the third end of the first switch tube. A third resistor is connected between the third end of the second switch tube and the ground terminal.
[0013] Optionally, the control module includes a single-chip microcomputer.
[0014] In a second aspect, an embodiment of the present application provides an illumination device, including the short-circuit prevention control device of the above-mentioned illumination device.
[0015] A short - circuit prevention control device for a lighting device provided by an embodiment of the present application realizes short - circuit protection by connecting a short - circuit protection sub - module to the output end of a switch control sub - module. The control module controls whether the switch control sub - module outputs power according to the high and low levels fed back by the short - circuit protection sub - module. The short - circuit prevention control device of the lighting device has a simple structure, reduces the cost of short - circuit protection, improves the response time of short - circuit protection, and solves the problems of complex circuit and high cost of the existing short - circuit prevention circuit for automotive headlights. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] 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 - described drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0017] In order to more fully 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.
[0018] Figure 1 It is a schematic framework diagram of a short - circuit prevention control device for a lighting device provided by an embodiment of the present application.
[0019] Figure 2 It is a schematic circuit diagram of a short - circuit prevention control device for a lighting device provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0020] The following will clearly and completely describe the technical solutions in an embodiment of the present application in conjunction with the drawings in the embodiment of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of them. 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.
[0021] An embodiment of the present application provides a lighting device and its short - circuit prevention control device to solve the problems of complex circuit and high cost of the existing short - circuit prevention circuit for automotive headlights. The lighting device and its short - circuit prevention control device can be applied to lighting devices such as automotive lamps and daily lighting lamps.
[0022] Embodiment 1:
[0023] The short - circuit prevention control device of the lighting device provided by an embodiment of the present application. Exemplarily, please refer to Figure 1 , Figure 1 It is a schematic framework diagram of a short - circuit prevention control device for a lighting device provided by an embodiment of the present application.
[0024] As Figure 1 shown, the utility model of the present application provides a short - circuit prevention control device for a lighting device, which includes a control module 10 and a power output module 20 connected to the control module 10. The power output module 20 includes a switch control sub - module 21 and a short - circuit protection sub - module 22 connected to the output end of the switch control sub - module 21. The input end of the switch control sub - module 21 is connected to a power supply, and the output end of the switch control sub - module 21 is connected to a load. The control module 10 is used to control whether the switch control sub - module 21 outputs power by using high and low levels.
[0025] Furthermore, both the switch control sub - module 21 and the short - circuit protection sub - module 22 are connected to the control module 10. The input end of the switch control sub - module 21 is connected to a power supply. By controlling the control module 10, it is determined whether the switch control sub - module 21 outputs power to the load. The short - circuit protection sub - module 22 is used to protect the switch control sub - module 21 from short - circuit, enabling the short - circuit prevention control device of the lighting device to achieve short - circuit protection. Under the requirement of achieving the same function, it not only reduces the material and management costs of the lighting device, but also eliminates the risk of functional failure caused by short - circuit.
[0026] Furthermore, both the short - circuit protection sub - module 22 and the switch control sub - module 21 are also connected to the control module 10.
[0027] Figure 2 It is a circuit schematic diagram of the short - circuit prevention control device for a lighting device provided by an embodiment of the present application.
[0028] As Figure 2 shown, in the embodiment of the utility model of the present application, the control module 10 includes a single - chip microcomputer U1A or a micro - control unit MCU.
[0029] The short - circuit prevention control device for a lighting device provided by an embodiment of the present application realizes short - circuit protection by connecting a short - circuit protection sub - module to the output end of the switch control sub - module. The control module controls whether the switch control sub - module outputs power according to the high and low levels fed back by the short - circuit protection sub - module. The short - circuit prevention control device of the lighting device has a simple structure, reduces the cost of short - circuit protection, improves the response time of short - circuit protection, and solves the problems of complex circuit and high cost of the existing short - circuit prevention circuit for automobile headlights.
[0030] As Figure 1 shown, in the embodiment of the utility model of the present application, the short - circuit protection sub - module 22 includes a voltage - dividing circuit for voltage division and a filtering circuit for signal feedback. The voltage - dividing circuit is connected to the filtering circuit, and the filtering circuit is connected to the control module 10. As Figure 2As shown, the voltage dividing circuit includes a fifth resistor R5 and a sixth resistor R6 connected in series with the fifth resistor R5. The fifth resistor R5 is also connected to the output terminal of the switch control sub-module 21, and the sixth resistor R6 is also connected to the ground terminal GND; the filtering circuit includes a seventh resistor R7 and a first capacitor C1. The first end of the seventh resistor R7 is connected to the series node of the fifth resistor R5 and the sixth resistor R6. The second end of the seventh resistor R7 is respectively connected to the first end of the first capacitor C1 and the signal feedback connection terminal FB. The signal feedback connection terminal FB is used to connect to the control module 10, and the second end of the first capacitor C1 is connected to the ground terminal GND.
[0031] Furthermore, the signal feedback connection terminal FB is connected to the twenty-ninth pin of the single-chip microcomputer U1A. The short-circuit prevention control device of this lighting device adds a voltage dividing circuit at the output terminal of the switch control sub-module 21 and feeds it back to the single-chip microcomputer through the filtering circuit for monitoring. The single-chip microcomputer determines whether the switch control sub-module 21 has a short-circuit fault by collecting the high-level signal and low-level signal fed back by the signal feedback connection terminal FB, so as to control whether the switch control sub-module 21 outputs power and achieve short-circuit protection. In this embodiment, if the signal feedback connection terminal FB outputs a high level to the single-chip microcomputer, it means that the switch control sub-module 21 has no short-circuit fault, and the single-chip microcomputer controls the switch control sub-module 21 to output power to the load. If the signal feedback connection terminal FB outputs a low level to the single-chip microcomputer, it means that the switch control sub-module 21 has a short-circuit fault, and the single-chip microcomputer controls the switch control sub-module 21 not to work, and the power cannot be output to the load through the switch control sub-module 21.
[0032] As Figure 2As shown, in the embodiment of the utility model of the present application, the switch control sub-module 21 includes a power input terminal POWER, an enable connection terminal EN, and a power output terminal OUT. The power input terminal POWER is used to connect to a power supply. A constant voltage circuit is provided between the power input terminal POWER and the power output terminal OUT. An enable control circuit is provided between the constant voltage circuit and the enable connection terminal EN. The power output terminal OUT is used to connect to a load. A short-circuit protection sub-module 22 is provided between the power output terminal OUT and the ground terminal GND. The enable connection terminal EN is used to connect to the control module 10. The constant voltage circuit includes a second switching tube Q2 for controlling whether to output power to the power output terminal OUT. The second terminal of the second switching tube Q2 is connected to the power input terminal POWER. The third terminal of the second switching tube Q2 is connected to the power output terminal OUT. The first terminal of the second switching tube Q2 is connected to the enable control circuit. The first terminal of the second switching tube Q2 is also connected in series with a voltage regulator diode ZD1 to the ground terminal GND. The enable control circuit includes a first switching tube Q1 for controlling whether the second switching tube Q2 is turned on. The third terminal of the first switching tube Q1 is connected to the first terminal of the second switching tube Q2. The second terminal of the first switching tube Q1 is connected to the ground terminal GND. The first terminal of the first switching tube Q1 is connected to the enable connection terminal EN.
[0033] Further, the second switching tube Q2 can be selected as an NPN triode, and the first switching tube Q1 can be selected as an N-MOS tube. The base of the triode is used as the first terminal of the second switching tube Q2, the emitter of the triode is used as the third terminal of the second switching tube Q2, and the collector of the triode is used as the second terminal of the second switching tube Q2. The source of the MOS tube is used as the second terminal of the first switching tube Q1, the gate of the MOS tube is used as the first terminal of the first switching tube Q1, and the drain of the MOS tube is used as the first terminal of the first switching tube Q1. In other embodiments, the first switching tube Q1 and the second switching tube Q2 can also be selected as other IGBT tubes with the same function, etc. In this embodiment, as Figure 2As shown, after the power input terminal POWER is connected to the external power supply of 12V, since the voltage regulator diode ZD1 of 8.2V and the second switching transistor Q2 form a constant voltage circuit, the voltage output at the power output terminal OUT is equal to 8.2V - 0.7V = 7.5V. The voltage at the signal feedback connection terminal FB is equal to 4.3V after being divided by the fifth resistor R5 and the sixth resistor R6. This is the normal operating state of the switching control sub-module 21 and the power output terminal OUT. When the power output terminal OUT is short-circuited to the ground terminal GND, the voltage output at the power output terminal OUT is equal to 0V, and the voltage at the signal feedback connection terminal FB is equal to 0V. This is the short-circuit state of the switching control sub-module 21 and the power output terminal OUT. The single-chip microcomputer U1A of the control module 10 determines whether the power output terminal OUT is in a short-circuit state by identifying the high and low levels fed back from the signal feedback connection terminal FB. If it is in a short-circuit state, the control enables the connection terminal EN to output a high level, the first switching transistor Q1 conducts, pulling down the voltage at the first terminal of the second switching transistor Q2, turning off the second switching transistor Q2, and the power output terminal OUT outputs 0V. If it is in a normal state, the control enables the connection terminal EN to output a low level, the first switching transistor Q1 is cut off, the voltage at the first terminal of the second switching transistor Q2 will not be pulled down, the second switching transistor Q2 conducts, and the power output terminal OUT normally outputs 7.5V power to the load. The short-circuit protection control device of the lighting device monitors the high and low levels fed back from the signal feedback connection terminal FB through the single-chip microcomputer to control whether the second switching transistor Q2 conducts to achieve short-circuit protection. Under the requirement of achieving the same function, it not only reduces the material and management costs of the lighting device, but also eliminates the risk of functional failure caused by short circuit.
[0034] As Figure 2 shown, in the embodiment of the present utility model of the present application, a first resistor R1 is connected in series between the enable connection terminal EN and the first terminal of the first switching transistor Q1, and a second resistor R2 is connected between the first terminal of the first switching transistor Q1 and the ground terminal GND. A fourth resistor R4 is connected between the second terminal of the second switching transistor Q2 and the third terminal of the first switching transistor Q1, and a third resistor R3 is connected between the third terminal of the second switching transistor Q2 and the ground terminal GND.
[0035] Embodiment 2:
[0036] The present utility model of the present application provides a lighting device, including the short-circuit protection control device of the lighting device described above.
[0037] Further, the content of the short-circuit protection control device of the lighting device has been described in Embodiment 1 and will not be repeated here. The lighting device determines whether a short circuit occurs by the high and low levels fed back from the signal feedback connection terminal, and controls whether the second switching transistor conducts to output power to the load, achieving short-circuit protection.
[0038] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.
[0039] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.
[0040] The short - circuit prevention control device of the lighting equipment provided in an embodiment of the present application has been introduced in detail above. 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, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.
Claims
1. A short-circuit prevention control device for lighting equipment, characterized in that: It includes a control module and a power output module connected to the control module, the power output module includes a switch control submodule and a short circuit protection submodule connected to the output end of the switch control submodule, the input end of the switch control submodule is connected to the power supply, the output end of the switch control submodule is connected to the load, and the control module is used to control whether the switch control submodule outputs power by using high and low levels.
2. The short-circuit prevention control device for lighting equipment according to claim 1, characterized in that: The short-circuit protection submodule includes a voltage dividing circuit for voltage division and a filter circuit for signal feedback, the voltage dividing circuit is connected to the filter circuit, and the filter circuit is connected to the control module.
3. The short-circuit prevention control device for lighting equipment according to claim 2, characterized in that: The voltage divider circuit includes a fifth resistor and a sixth resistor connected in series with the fifth resistor, the fifth resistor is also connected to the output end of the switch control submodule, and the sixth resistor is also connected to the ground end; the filtering circuit includes a seventh resistor and a first capacitor, the first end of the seventh resistor is connected to the series node of the fifth resistor and the sixth resistor, the second end of the seventh resistor is respectively connected to the first end of the first capacitor and the signal feedback connection end, the signal feedback connection end is used to be connected to the control module, and the second end of the first capacitor is connected to the ground end.
4. The short-circuit prevention control device for lighting equipment according to claim 1, characterized in that: The switch control submodule includes a power input terminal, an enable connection terminal and a power output terminal, the power input terminal is used to connect to a power supply, a constant voltage circuit is arranged between the power input terminal and the power output terminal, an enable control circuit is arranged between the constant voltage circuit and the enable connection terminal, the power output terminal is used to connect to the load, the short-circuit protection submodule is arranged between the power output terminal and the ground terminal, and the enable connection terminal is used to connect to the control module.
5. The short-circuit prevention control device for lighting equipment according to claim 4, characterized in that: The constant voltage circuit includes a second switch tube for controlling whether to output power to the power output end, the second end of the second switch tube is connected to the power input end, the third end of the second switch tube is connected to the power output end, the first end of the second switch tube is connected to the enable control circuit, and the first end of the second switch tube is also connected in series with a voltage regulator tube and the ground end.
6. The short-circuit prevention control device for lighting equipment according to claim 5, characterized in that: The enable control circuit includes a first switch tube for controlling whether the second switch tube is turned on, the third end of the first switch tube is connected to the first end of the second switch tube, the second end of the first switch tube is connected to the ground end, and the first end of the first switch tube is connected to the enable connection end.
7. The short-circuit prevention control device for lighting equipment according to claim 6, characterized in that: A first resistor is connected in series between the enable connection end and the first end of the first switch tube, and a second resistor is connected between the first end of the first switch tube and the ground end.
8. The short-circuit prevention control device for lighting equipment according to claim 6, characterized in that: A fourth resistor is connected between the second end of the second switch tube and the third end of the first switch tube, and a third resistor is connected between the third end of the second switch tube and the ground end.
9. The short-circuit prevention control device for lighting equipment according to claim 1, characterized in that: The control module includes a single chip microcomputer.
10. A lighting device, characterized in that: The invention comprises the short-circuit prevention control device of the lighting equipment as described in any one of claims 1 to 9.