Car lamp and short circuit prevention control device thereof
By designing a combination of switch control module and short-circuit protection module in the headlight fixture, the problem of complex and high cost of anti-short circuit of the existing headlights is solved, and the effect of simplifying the circuit structure and reducing costs is achieved.
Patent Information
- Application Number
- CN202421679395.8
- 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 expensive anti-short circuits.
Design a short-circuit control device for car lamps, including a switch control module and a short-circuit protection module. The short-circuit protection module is used to lower the working voltage of the switch control module to realize short-circuit protection of the switch control module.
It reduces the cost of short-circuit protection, increases the time of short-circuit protection response, simplifies the circuit structure, and solves the complex and costly problems of existing vehicle light anti-short circuits.
Smart Images
Figure CN222981712U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the technical field of lamp short - circuit prevention, and particularly relates to a vehicle headlamp and its short - circuit prevention control device. Background Art
[0002] With the rapid changes in the automotive industry, consumers' expectations for automobiles are also constantly increasing. It has become a general trend to offer high - quality products at low prices. As an important part of the whole vehicle, vehicle headlamps. Currently, in addition to the left and right side lights on most vehicles, lights such as LOGO lights and through lights are also added. The drive circuit is generally placed at the left and right headlamps, and other lamps are powered and controlled through wire harnesses. However, the input and output wire harnesses of the lamps need to pass through short - circuit tests.
[0003] Currently, to achieve short - circuit protection for vehicle headlamps, a current detector is added at the output port. When the current increases to a certain level, the circuit is automatically disconnected to protect related 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 vehicle headlamp and its short - circuit prevention control device to solve the problems of complex and high - cost short - circuit prevention circuits in existing vehicle headlamps.
[0005] In a first aspect, an embodiment of this application provides a short - circuit prevention control device for a vehicle headlamp, including:
[0006] A switch control module, the input end of the switch control module is connected to a power supply, and the output end of the switch control module is connected to a load;
[0007] A short - circuit protection module, used to be connected to the switch control module and the load.
[0008] Optionally, the short - circuit protection module includes a thirty - fourth semiconductor element and a thirty - third semiconductor element. The second end of the thirty - fourth semiconductor element is connected to the switch control module. The first end of the thirty - fourth semiconductor element is respectively connected to a DC power supply terminal and the first end of the thirty - third semiconductor element. The second end of the thirty - third semiconductor element is connected to the power output end of the switch control module.
[0009] Optionally, a sixth resistor for over - voltage protection is connected between the first end of the thirty - fourth semiconductor element and the DC power supply terminal.
[0010] Optionally, the switch control module includes a power input terminal, a first switch tube, a third switch tube, and a power output terminal. The power input terminal is connected to the power supply. The second terminal of the first switch tube is connected to the power input terminal. The third terminal of the first switch tube is connected to the power output terminal. The first terminal of the first switch tube is connected to the second terminal of the third switch tube. The first terminal of the third switch tube is connected to the short-circuit protection module. The third terminal of the third switch tube is grounded.
[0011] Optionally, a fourth resistor is connected between the first terminal of the first switch tube and the second terminal of the third switch tube.
[0012] Optionally, a ninth resistor is connected in parallel between the first terminal and the third terminal of the third switch tube.
[0013] Optionally, a voltage regulator tube and a second resistor are connected in parallel between the second terminal and the first terminal of the first switch tube.
[0014] Optionally, the first switch tube is a PNP-type MOS tube. The source electrode of the MOS tube serves as the second terminal of the first switch tube. The gate electrode of the MOS tube serves as the first terminal of the first switch tube. The drain electrode of the MOS tube serves as the first terminal of the first switch tube.
[0015] Optionally, the third switch tube is an NPN-type field effect transistor. The base electrode of the field effect transistor serves as the first terminal of the third switch tube. The emitter electrode of the field effect transistor serves as the third terminal of the third switch tube. The collector electrode of the field effect transistor serves as the second terminal of the third switch tube.
[0016] In a second aspect, an embodiment of the present application provides a vehicle lamp, including the short-circuit prevention control device of the vehicle lamp described above.
[0017] The short-circuit prevention control device of a vehicle lamp provided by an embodiment of the present application, after a short-circuit fault occurs, pulls down the working voltage of the switch control module through the short-circuit protection module, so that the switch control module does not work and cannot output power to the load, realizing short-circuit protection of the switch control module by using the short-circuit protection module. The short-circuit prevention control device of this vehicle lamp 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 short-circuit prevention circuits and high costs of existing automotive vehicle lamps. Description of the Drawings
[0018] 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 drawings in the following description 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.
[0019] 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.
[0020] Figure 1 The frame schematic diagram of the short - circuit prevention control device for a vehicle headlight provided in an embodiment of the present application.
[0021] Figure 2 The circuit schematic diagram of the short - circuit prevention control device for a vehicle headlight provided in an embodiment of the present application. Specific embodiments
[0022] 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 some embodiments of the present application, rather than all 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.
[0023] An embodiment of the present application provides a vehicle headlight and its short - circuit prevention control device to solve the problems of complex short - circuit prevention circuits and high costs in existing automotive headlights. This vehicle headlight and its short - circuit prevention control device can also be applied to lamps such as spotlights and daily lighting lamps.
[0024] Embodiment 1:
[0025] The short - circuit prevention control device for a vehicle headlight provided in an embodiment of the present application. Exemplarily, please refer to Figure 1 , Figure 1 The frame schematic diagram of the short - circuit prevention control device for a vehicle headlight provided in an embodiment of the present application.
[0026] As Figure 1 shown, the present utility model provides a short - circuit prevention control device for a vehicle headlight, including a switch control module 10 and a short - circuit protection module 20 connected to the switch control module 10. The input end of the switch control module 10 is connected to the power supply, the output end of the switch control module 10 is connected to the load, and the short - circuit protection module 20 is also connected to the load. At this time, the short - circuit protection module 20 is connected to the load through the switch control module 10.
[0027] Further, the short - circuit protection module 20 is connected to the output end of the switch control module 10. The input end of the switch control module 10 is connected to the power supply. When a short - circuit fault occurs in the circuit and / or the load, the short - circuit protection module 20 pulls down the working voltage of the switch control module 10, so that the switch control module 10 does not work and cannot output power to the load, realizing short - circuit protection for the anti - short - circuit control device of the vehicle lamp by using the short - circuit protection module 20. The anti - short - circuit control device of the vehicle lamp realizes short - circuit protection. Under the requirement of realizing the same function, it not only reduces the material and management costs of the vehicle lamp, but also eliminates the risk of function failure caused by short - circuit.
[0028] The anti - short - circuit control device of the vehicle lamp provided by an embodiment of the present application pulls down the working voltage of the switch control module through the short - circuit protection module after a short - circuit fault occurs, so that the switch control module does not work and cannot output power to the load, realizing short - circuit protection for the switch control module by using the short - circuit protection module. The anti - short - circuit control device of the vehicle lamp 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 anti - short - circuit circuit and high cost of existing automotive vehicle lamps.
[0029] Figure 2 It is a circuit schematic diagram of the anti - short - circuit control device of the vehicle lamp provided by an embodiment of the present application.
[0030] As Figure 2 shown, in an embodiment of the utility model of the present application, the short - circuit protection module 20 includes a thirty - fourth semiconductor element D34 and a thirty - third semiconductor element D33 for preventing reverse connection. The second end of the thirty - fourth semiconductor element D34 is connected to the second node B of the switch control module 10. The first end of the thirty - fourth semiconductor element D34 is respectively connected to the DC power supply terminal and the first end of the thirty - third semiconductor element D33. The second end of the thirty - third semiconductor element D33 is connected to the power output terminal OUT of the switch control module 10.
[0031] Further, a sixth resistor R6 for over - voltage protection is connected between the first end of the thirty - fourth semiconductor element D34 and the DC power supply terminal. In this embodiment, the DC power supply terminal is used to connect to 5V DC power. Both the thirty - fourth semiconductor element D34 and the thirty - third semiconductor element D33 can be selected as diodes. The anode of the diode is used as the first end of the thirty - fourth semiconductor element D34 and the thirty - third semiconductor element D33, and the cathode of the diode is used as the second end of the thirty - fourth semiconductor element D34 and the thirty - third semiconductor element D33.
[0032] As Figure 2As shown, in an embodiment of the utility model of the present application, the switch control module 10 includes a power input terminal POWER, a first switch tube Q1, a third switch tube Q3, and a power output terminal OUT. The power input terminal POWER is connected to a power supply. The second terminal of the first switch tube Q1 is connected to the power input terminal POWER. The third terminal of the first switch tube Q1 is connected to the power output terminal OUT. The first terminal of the first switch tube Q1 is connected to the second terminal of the third switch tube Q3. The first terminal of the third switch tube Q3 is connected to the short-circuit protection module 20. The third terminal of the third switch tube Q3 is grounded. Among them, a fourth resistor R4 is connected between the first terminal of the first switch tube Q1 and the second terminal of the third switch tube Q3; a ninth resistor R9 is connected in parallel between the first terminal and the third terminal of the third switch tube Q3; a voltage stabilizing diode ZD1 and a second resistor R2 are connected in parallel between the second terminal and the first terminal of the first switch tube Q1.
[0033] Further, the third switch tube Q3 can be selected as an NPN-type field effect transistor, and the first switch tube Q1 can be selected as a PNP-type MOS transistor. The base of the field effect transistor serves as the first terminal of the third switch tube Q3, the emitter of the field effect transistor serves as the third terminal of the third switch tube Q3, and the collector of the field effect transistor serves as the second terminal of the third switch tube Q3. The source of the MOS transistor serves as the second terminal of the first switch tube Q1, the gate of the MOS transistor serves as the first terminal of the first switch tube Q1, and the drain of the MOS transistor serves as the first terminal of the first switch tube Q1. In other embodiments, the first switch tube Q1 and the third switch tube Q3 can also be selected as other IGBT tubes with the same function, etc. In this embodiment, a thirty-fourth semiconductor element D34 and a thirty-third semiconductor element D33 are added to the power output terminal OUT of the vehicle lamp fixture and connected to the first terminal of the third switch tube Q3. If a short-circuit fault occurs, the third switch tube Q3 and the first switch tube Q1 will immediately disconnect, cutting off the power supply between the power input terminal POWER and the power output terminal OUT, thereby realizing the function of short-circuit protection.
[0034] In the embodiment of the utility model of the present application, as Figure 2As shown, after the power input terminal POWER is connected to the external power supply of 12V, when the power output terminal OUT is in a fault-free state, the third switching transistor Q3 conducts normally, and the voltage output at the power output terminal OUT is close to the input voltage of 12V at the power input terminal POWER. When the power output terminal OUT is short-circuited to the ground, the voltage of the first node A (the node connected between the thirty-fourth semiconductor element D34 and the thirty-third semiconductor element D33) with respect to the ground becomes the voltage of the thirty-third semiconductor element D33, which is 0.7V. After passing through the thirty-fourth semiconductor element D34, the voltage output from the second node B with respect to the ground is close to 0V. At this time, the third switching transistor Q3 is in the cut-off state, so the first switching transistor Q1 does not conduct, cutting off the power supply line between the power input terminal POWER and the power output terminal OUT, thus realizing the short-circuit protection function.
[0035] Embodiment 2:
[0036] The utility model of the present application provides a vehicle lamp, including the short-circuit prevention control device of the above vehicle lamp.
[0037] Furthermore, the content of the short-circuit prevention control device of this vehicle lamp has been described in Embodiment 1, and will not be repeated here.
[0038] In the embodiment of the utility model of the present application, the input end of the switch control module 10 of the short-circuit prevention control device of the vehicle lamp is connected to the power supply. When a short-circuit fault occurs in the circuit and / or load, the short-circuit protection module 20 pulls down the working voltage of the switch control module 10, so that the switching transistors of the switch control module 10 do not work and cannot output power to the load, realizing short-circuit protection. Under the requirement of achieving the same function, the vehicle lamp not only reduces the material and management costs of the vehicle lamp, but also eliminates the risk of functional failure caused by short circuit.
[0039] Further, after the power input terminal POWER of the headlamp fixture is connected to an external power supply of 12V through the short - circuit prevention control device of the headlamp fixture, when the power output terminal OUT is in a fault - free state, the third switching transistor Q3 conducts normally, and the voltage output at the power output terminal OUT is close to the input voltage of 12V at the power input terminal POWER. When the power output terminal OUT is grounded in a short - circuit fault state, the voltage of the first node A (the node connected between the thirty - fourth semiconductor element D34 and the thirty - third semiconductor element D33) with respect to the ground becomes the voltage of the thirty - third semiconductor element D33, which is 0.7V. After passing through the thirty - fourth semiconductor element D34, the voltage output from the second node B with respect to the ground is close to 0V. At this time, the third switching transistor Q3 is in a cut - off state, so the first switching transistor Q1 does not conduct, cutting off the power supply line between the power input terminal POWER and the power output terminal OUT, and no power is output to the load, thus realizing the short - circuit protection function.
[0040] In the above - mentioned embodiments, the descriptions of each embodiment have their own focuses. For the parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0041] 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, the features defined with "first" and "second" may explicitly or implicitly include one or more features.
[0042] The above has introduced in detail the short - circuit prevention control device of the headlamp 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, 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 a vehicle lamp, characterized in that: include: A switch control module, wherein an input end of the switch control module is connected to a power source, and an output end of the switch control module is connected to a load; A short circuit protection module is used to connect with the switch control module and the load.
2. The short-circuit prevention control device for a vehicle lamp according to claim 1, characterized in that: The short-circuit protection module includes a thirty-fourth semiconductor element and a thirty-third semiconductor element, the second end of the thirty-fourth semiconductor element is connected to the switch control module, the first end of the thirty-fourth semiconductor element is respectively connected to the DC power supply end and the first end of the thirty-third semiconductor element, and the second end of the thirty-third semiconductor element is connected to the power output end of the switch control module.
3. The short-circuit prevention control device for a vehicle lamp according to claim 2, characterized in that: A sixth resistor for overvoltage protection is connected between the first end of the thirty-fourth semiconductor element and the DC power supply end.
4. The short-circuit prevention control device for a vehicle lamp according to claim 1, characterized in that: The switch control module includes a power input end, a first switch tube, a third switch tube and a power output end, the power input end is connected to the power supply, the second end of the first switch tube is connected to the power input end, the third end of the first switch tube is connected to the power output end, the first end of the first switch tube is connected to the second end of the third switch tube, the first end of the third switch tube is connected to the short-circuit protection module, and the third end of the third switch tube is grounded.
5. The short-circuit prevention control device for a vehicle lamp according to claim 4, characterized in that: A fourth resistor is connected between the first end of the first switch tube and the second end of the third switch tube.
6. The short-circuit prevention control device for a vehicle lamp according to claim 4, characterized in that: A ninth resistor is connected in parallel between the first end of the third switch tube and the third end of the third switch tube.
7. The short-circuit prevention control device for a vehicle lamp according to claim 4, characterized in that: A voltage regulator tube and a second resistor are connected in parallel between the second end of the first switch tube and the first end of the first switch tube.
8. The short-circuit prevention control device for a vehicle lamp according to claim 4, characterized in that: The first switch tube is a PNP type MOS tube, the source of the MOS tube serves as the second end of the first switch tube, the gate of the MOS tube serves as the first end of the first switch tube, and the drain of the MOS tube serves as the first end of the first switch tube.
9. The short-circuit prevention control device for a vehicle lamp according to claim 4, characterized in that: The third switch tube is an NPN field effect tube, the base of the field effect tube serves as the first end of the third switch tube, the emitter of the field effect tube serves as the third end of the third switch tube, and the collector of the field effect tube serves as the second end of the third switch tube.
10. A vehicle lamp, characterized in that: A short-circuit prevention control device for a vehicle lamp comprising the device described in any one of claims 1 to 9.