High beam and low beam driver

Abstract

The utility model discloses a high-beam and low-beam lamp driver, relates to the technical field of automobile lighting, and solves the problems that an existing vehicle LED lighting driver is prone to electromagnetic interference and poor in output current and voltage stability. The LED constant current source driving circuit is characterized by comprising an input filtering protection circuit, an LED constant current source driving circuit, an electromagnetic valve constant voltage driving circuit, a first output filtering circuit and a second output filtering circuit, the input end of the input filtering protection circuit is connected with a power supply, and the first output end of the input filtering protection circuit is sequentially connected with the LED constant current source driving circuit and the first output filtering circuit; a second output end of the input filtering protection circuit is sequentially connected with an electromagnetic valve constant-voltage driving circuit and a second output filtering circuit and provides stable voltage for a high-beam electromagnetic valve in the high-beam and low-beam lamp; stable driving of the driver is ensured through constant-current and constant-voltage driving technologies, and the anti-electromagnetic interference capability is improved through input and output filtering and protection circuits.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile lighting, and more specifically, to a high and low beam lamp driver. Background Art

[0002] In the current automotive industry, LED lighting technology has become mainstream, replacing traditional halogen and xenon lamps. LED lighting has the advantages of high brightness, low energy consumption, long life and fast response, so it has been widely used. However, the stability and reliability of LED lighting systems are still a challenge.

[0003] In order to meet the constant current and constant voltage requirements of LED lighting systems, some driver technologies have been proposed, but there are still some problems. For example, when the vehicle is running, it may encounter a complex electromagnetic environment, causing the driver to be subject to electromagnetic interference, affecting the LED lighting effect. In addition, the stability of the output current and voltage also needs to be guaranteed to prevent abnormal conditions such as overload, short circuit and voltage surge from damaging the LED lights and circuits.

[0004] Based on this, the present application provides a high and low beam headlight driver to solve the above problems. Utility Model Content

[0005] The technical problem to be solved by this application is that the existing vehicle LED lighting driver is susceptible to electromagnetic interference and has poor output current and voltage stability. The purpose is to provide a high and low beam driver that uses constant current and constant voltage driving technology to ensure that the driver stably drives the LED lamp and the high beam solenoid valve, and improves the driver's anti-electromagnetic interference ability through input and output filtering and protection circuits.

[0006] This application is implemented through the following technical solutions:

[0007] A high and low beam lamp driver comprises: a box body, a cover plate, a fastener, a cable and a drive board, the box body and the cover plate are connected by the fastener to form a closed cavity, the drive board is fixed in the closed cavity, the input end and the output end of the drive board are both connected to the cable, and the cable passes through the closed cavity; a drive circuit is arranged on the drive board, the drive circuit comprises: an input filter protection circuit, an LED constant current source drive circuit, an electromagnetic valve constant voltage drive circuit, a first output filter circuit and a second output filter circuit, the input end of the input filter protection circuit is connected to a power supply through a cable, the first output end of the input filter protection circuit is connected to the LED constant current source drive circuit and the first output filter circuit in sequence, the first output filter circuit provides a stable current for the LED lamp in the high and low beam lamp through the cable, the second output end of the input filter protection circuit is connected to the electromagnetic valve constant voltage drive circuit and the second output filter circuit in sequence, and the second output filter circuit provides a stable voltage for the high beam electromagnetic valve in the high and low beam lamp through the cable.

[0008] By adopting the above technical scheme, by setting up an LED constant current source drive circuit and an electromagnetic valve constant voltage drive circuit, constant current and constant voltage technologies are used to drive the LED lamps and the high beam electromagnetic valves in the car's high and low beam lamps respectively, thereby ensuring the long life of the LED lamps and the stable operation of the high beam electromagnetic valves; in addition, an input filter protection circuit is set in the drive circuit to improve the anti-electromagnetic interference performance, and an output filter and protection circuit is set to ensure the stability of the power supply output and prevent the circuit from being damaged by potential risks such as overload, short circuit or voltage surge.

[0009] In a possible implementation manner, the driving plate is sealed by an integral potting colloid.

[0010] In a possible implementation manner, the power supply is DC18-32V.

[0011] In a possible implementation, the input filter protection circuit includes: a common-mode differential-mode filter circuit and a spike surge reverse protection circuit, wherein the common-mode differential-mode filter circuit is used to filter out common-mode noise and differential-mode noise in the power supply, and the spike surge reverse protection circuit is used to suppress voltage spikes and prevent surges, thereby realizing single-phase flow of current.

[0012] In a possible implementation, the LED constant current source drive circuit uses a 2A constant current DC-DC chip.

[0013] In a possible implementation manner, the box body and the cover plate are made of copper, and the fasteners are made of 304 stainless steel.

[0014] In a possible implementation manner, the surfaces of the box body and the cover plate are covered with a dense oxide film.

[0015] In a possible implementation manner, a step structure that cooperates with each other is provided at the joint between the box body and the cover plate.

[0016] In a possible implementation manner, the bottom of the box body contacts the housing of the high and low beam lights, and the contact surface is covered with thermal conductive silicone grease.

[0017] In a possible implementation manner, the cable is a shielded cable, and a shielding layer of the shielded cable is connected to the box body.

[0018] Compared with the prior art, this application has the following beneficial effects:

[0019] By using constant current and constant voltage driving technology to drive LED lights and high beam solenoid valves, the driver can ensure that the LED lights and high beam solenoid valves work under stable current and voltage, improving energy efficiency and reliability; through anti-electromagnetic interference technology and output filtering and protection technology, the input and output filtering and protection circuits are adopted to improve the anti-interference ability and stability of the driver; through the packaging technology of overall potting colloid sealing, the dust and water resistance of the product are enhanced, and the durability and reliability of the driver in various harsh working environments are improved;

[0020] The driver integrates constant current and constant voltage technologies, takes into account the stability of performance and durability of the product, as well as anti-interference ability and safety, to provide a high and low beam driver suitable for automotive lighting systems; it has a compact design, small size, can adapt to extreme temperature environments, and has good electromagnetic compatibility. It can adapt to various vehicle lighting environments and work normally under extreme temperatures, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of the present application, and do not constitute a limitation on the embodiments of the present application. In the drawings:

[0022] Figure 1 A schematic diagram of the structure of the high and low beam driver provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram of the connection between the high and low beam lamp driver and the high and low beam lamp provided in an embodiment of the present application;

[0024] Figure 3 A schematic diagram of the principle of a driving circuit provided in an embodiment of the present application;

[0025] Figure 4 A schematic diagram of the structure of a driving circuit provided in an embodiment of the present application.

[0026] Marks and corresponding parts names in the attached drawings:

[0027] 1. Box body; 2. Cover plate; 3. Insulation barrier; 4. Cables; 5. Drive board; 6. High and low beam lights. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the utility model more clearly understood, the utility model is described in detail in a possible implementation mode in combination with embodiments and drawings below. The schematic implementation mode of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0029] The present application embodiment provides a driver for a high and low beam lamp 6, such as Figure 1-Figure 2 As shown. It includes: a box body 1, a cover plate 2, a fastener, a cable 4 and a driving board 5, wherein the box body 1 is connected to the cover plate 2 through the fastener to form a closed cavity, wherein the driving board 5 is fixed in the closed cavity, wherein the input end and the output end of the driving board 5 are both connected to the cable 4, and the cable 4 passes through the closed cavity; wherein the driving board 5 is provided with a driving circuit, wherein the driving circuit includes: an input filter protection circuit, an LED constant current source driving circuit, an electromagnetic valve constant voltage driving circuit, a first output filter circuit and a second output filter circuit, wherein the input end of the input filter protection circuit is connected to a power supply through the cable 4, wherein the first output end of the input filter protection circuit is sequentially connected to the LED constant current source driving circuit and the first output filter circuit, wherein the first output filter circuit provides a stable current to the LED lamp in the high and low beam lamp 6 through the cable 4, wherein the second output end of the input filter protection circuit is sequentially connected to the electromagnetic valve constant voltage driving circuit and the second output filter circuit, wherein the second output filter circuit provides a stable voltage to the high beam electromagnetic valve in the high and low beam lamp 6 through the cable 4.

[0030] Specifically, in terms of structure, the driver includes a box body 1 and a cover plate 2. The upper part of the box body 1 protrudes, and the protruding part has an inward-recessed open cavity. The opening of the cavity is connected to the cover plate 2 by fasteners such as screws to form a closed cavity. A driving board 5 is fixed in the closed cavity, and an insulating barrier 3 is provided on the upper and lower sides of the driving board 5. The driving circuit is provided on the driving board 5, and the input and output cables 4 are connected through the cable 4 locker, and the cable 4 passes through the closed cavity. In terms of circuit, the driver converts the power supply into a constant current and constant voltage output through the LED constant current source driving circuit and the solenoid valve constant voltage driving circuit, providing constant current and constant voltage drive for the LED lights in the low beam lights and the high beam solenoid valves in the car.

[0031] The improvement of this solution lies in that, by setting up an LED constant current source drive circuit and an electromagnetic valve constant voltage drive circuit, constant current and constant voltage technology are used to drive the LED lamp and the high beam electromagnetic valve in the automobile high and low beam lamp 6 respectively, so as to ensure the long life of the LED lamp and the stable operation of the high beam electromagnetic valve; in addition, an input filtering protection circuit is set in the driving circuit to improve the anti-electromagnetic interference performance, and an output filtering and protection circuit is set to ensure the stability of the power supply output and prevent the circuit from being damaged by potential risks such as overload, short circuit or voltage surge.

[0032] In terms of the drive circuit, the power supply is DC18~32V, the input filter protection circuit includes: common mode differential mode filter circuit and spike surge reverse connection protection circuit, the common mode differential mode filter circuit is used to filter out the common mode noise and differential mode noise in the power supply, the spike surge reverse connection protection circuit is used to suppress the voltage spike to prevent surge, and realize the single-phase flow of current, the LED constant current source drive circuit includes: DC-DC converter and constant current control circuit, the solenoid valve constant voltage drive circuit includes DC-DC converter and voltage control circuit, the first filter circuit and the second output filter circuit both provide output filter protection, respectively connect the LED lamp as the light source output, and connect the high beam solenoid valve as the solenoid valve output. Furthermore, the LED constant current source drive circuit can specifically use a 2A constant current DC-DC chip to provide a 2A constant current drive for the LED lamp.

[0033] Specifically, Figure 3-4 As shown, the high and low beam headlight 6 drivers are divided into 2 main driving circuits, among which the LED constant current source driving circuit is used to provide a stable 2A current for the headlight LED chip. This circuit can use a 2A constant current DC-DC chip with a high-power PWM constant current source design method to provide a constant current, which not only meets the large current output, but also has a simple circuit structure, high cost performance, and high control accuracy. Among them, the solenoid valve constant voltage driving circuit can adopt a high-frequency DC-DC conversion method, and introduce a control chip to perform logic control on its output voltage to meet the solenoid valve control logic requirements.

[0034] It can be understood that the high-voltage DC18~32V input is converted into one constant current output and one voltage output through internal circuit control and DC-DC conversion, realizing efficient conversion of constant current and constant voltage, reducing the power loss of the entire driver, reducing the temperature rise generated by the driver, thereby ensuring that the headlight LED and the drive circuit can work stably for a long time; the driver uses a 2A constant current DC-DC chip and a DC-DC constant voltage control circuit to drive the LED lamp and the high-beam solenoid valve respectively, ensuring that the current of the LED lamp remains constant, extending the service life of the LED lamp, and ensuring that the high-beam solenoid valve has a stable voltage supply; in addition, the input filtering protection circuit set in the driver improves the circuit's anti-electromagnetic interference (EMI) capability and ensures the stable operation of the driver in a complex vehicle-mounted electromagnetic environment; the output filtering and protection circuit set in the driver ensures that a stable power output is provided while protecting the circuit from damage due to abnormal conditions such as overload, short circuit or voltage surge.

[0035] In terms of packaging, the driver board 5 is sealed with an integral potting colloid. The internal components are sealed with an integral potting colloid to improve the dust and water resistance of the product, help protect the internal components from dust, moisture and other substances that may cause damage, improve the durability and applicability of the driver under harsh environmental conditions, and achieve packaging and housing optimization.

[0036] In terms of materials, the box body 1 and the cover plate 2 are made of copper, and the fasteners are made of 304 stainless steel.

[0037] In terms of structural molding, the box body 1 uses a solid copper CNC-processed internal cavity without splicing or welding.

[0038] In terms of surface treatment, the surface of the box body 1 and the cover plate 2 is covered with a dense oxide film. Specifically, the copper surface of the box body 1 and the cover plate 2 is anodized to form a dense oxide film to improve the corrosion resistance of copper.

[0039] In terms of electromagnetic compatibility, the cable 4 is a shielded cable 4 , and the shielding layer of the shielded cable 4 is connected to the box body 1 .

[0040] In terms of structural setting, a step structure that matches each other is set at the joint between the shell and the cover plate 2 to avoid gaps caused by loose fitting.

[0041] In terms of heat dissipation, the bottom of the box body 1 contacts the housing of the high and low beam lamp 6 for heat dissipation, and thermal grease is applied to the contact surface. The box body 1 and the housing of the high and low beam lamp 6 are fastened by three M4 screws, so that the bottom of the box body 1 is close to the housing of the high and low beam lamp 6, and the heat is transferred to the ambient air through the principle of heat conduction for heat exchange.

[0042] It should be noted that the driver has the characteristics of good vibration and shock resistance and high protection level. Surface treatment can prevent its surface effect and improve its resistance to moisture, heat and salt spray.

[0043] It can be understood that this solution drives the LED lamp and high-beam solenoid valve by adopting constant current and constant voltage driving technology. The driver can ensure that the LED lamp and high-beam solenoid valve work under stable current and voltage, thereby improving energy efficiency and reliability. Secondly, through anti-electromagnetic interference technology and output filtering and protection technology, the input and output filtering and protection circuits are adopted to improve the anti-interference ability and stability of the driver. Thirdly, the packaging technology of overall potting colloid sealing enhances the dustproof and waterproof capabilities of the product, and improves the durability and reliability of the driver in various harsh working environments. The driver is compactly designed and small in size, can adapt to extreme temperature environments (-43 to 70 degrees), and has good electromagnetic compatibility.

[0044] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A high and low beam lamp driver, characterized in that: include: A box body, a cover plate, a fastener, a cable and a drive plate, wherein the box body and the cover plate are connected by the fastener to form a closed cavity, the drive plate is fixed in the closed cavity, the input end and the output end of the drive plate are both connected to the cable, and the cable passes through the closed cavity; The driving circuit is arranged on the driving board, and the driving circuit comprises: an input filter protection circuit, an LED constant current source driving circuit, an electromagnetic valve constant voltage driving circuit, a first output filter circuit and a second output filter circuit. The input end of the input filter protection circuit is connected to the power supply through a cable, and the first output end of the input filter protection circuit is connected to the LED constant current source driving circuit and the first output filter circuit in sequence. The first output filter circuit provides a stable current to the LED lamp in the high and low beam lamp through a cable, and the second output end of the input filter protection circuit is connected to the electromagnetic valve constant voltage driving circuit and the second output filter circuit in sequence. The second output filter circuit provides a stable voltage to the high beam electromagnetic valve in the high and low beam lamp through a cable.

2. A high and low beam lamp driver according to claim 1, characterized in that: The driving plate is sealed by an integral potting colloid.

3. The high and low beam lamp driver according to claim 1, characterized in that: The power supply is DC18-32V.

4. The high and low beam lamp driver according to claim 1, characterized in that: The input filter protection circuit includes: a common-mode differential-mode filter circuit and a spike surge reverse connection protection circuit. The common-mode differential-mode filter circuit is used to filter out common-mode noise and differential-mode noise in the power supply. The spike surge reverse connection protection circuit is used to suppress voltage spikes and prevent surges to achieve single-phase flow of current.

5. The high and low beam lamp driver according to claim 1, characterized in that: The LED constant current source driving circuit adopts a 2A constant current DC-DC chip.

6. The high and low beam lamp driver according to claim 1, characterized in that: The box body and the cover plate are made of copper, and the fasteners are made of 304 stainless steel.

7. The high and low beam lamp driver according to claim 6, characterized in that: The surfaces of the box body and the cover plate are covered with a dense oxide film.

8. The high and low beam lamp driver according to claim 1, characterized in that: A step structure that matches each other is arranged at the joint between the box body and the cover plate.

9. The high and low beam lamp driver according to claim 1, characterized in that: The bottom of the box body contacts the housing of the high and low beam lights, and the contact surface is covered with thermal conductive silicone grease.

10. The high and low beam lamp driver according to claim 1, characterized in that: The cable is a shielded cable, and the shielding layer of the shielded cable is connected to the box body.

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