CN204460011U - A kind of vapour automobile-used LED Rear Fog Lamp - Google Patents

Abstract

The utility model provides an LED rear fog lamp for automobiles, which includes a light distribution mirror, a lamp housing, a reflective bowl, a substrate, a circuit board, at least one LED chip, a constant current power chip and a heat dissipation component; the constant current power chip and the LED chip are installed on the circuit board, and the constant current power supply chip provides power for the LED chip through the circuit board; the heat dissipation component includes a heat dissipation bottom plate and a plurality of heat dissipation bodies fixed on the lower surface of the heat dissipation bottom plate, and the adjacent Spaces are provided between the heat sinks; the substrate is sealed and connected to the circuit board and the heat dissipation bottom plate, and the heat sinks are arranged in an array and fixed on the lower surface of the heat dissipation bottom plate. In addition, the substrate is composed of a plurality of sub-substrates spaced apart from each other, and each sub-substrate corresponds to an LED chip or a constant current power supply chip. The utility model has the advantages of simple structure, small volume, good heat dissipation effect, realizes separation of thermoelectricity, reduces mutual influence between electronic components, and has low production cost.

Description

LED rear fog lamp for automobile

technical field

The utility model relates to a rear fog lamp, in particular to an LED rear fog lamp for automobiles.

Background technique

The rear fog lamp is a lamp that observes the vehicle from the rear of the vehicle under heavy fog conditions, making the vehicle more visible. According to the provisions of "GB4785-1007 Installation Regulations for Exterior Lighting and Light Signal Devices of Automobiles and Trailers", rear fog lamps are required for vehicles. At present, the light sources of rear fog lights on the market are mainly bulbs and LEDs. However, because the design of the light bulb light source is limited by space, shape and life; characteristics, gradually replacing bulb light sources as green light sources will be widely used in the use of automotive lamps. Moreover, for vehicle lamps with relatively tight lamp room space, when arranging LEDs according to the traditional method, considering the high heat generated by LED rear fog lamps and the lack of heat dissipation solutions, generally only a dozen of low-power LEDs are arranged. LED. Moreover, a plurality of LEDs are mainly connected in parallel and in series to realize a circuit. The current is controlled by changing the value of the resistor to ensure the light effect. The heat dissipation of the lamp is achieved by adding air holes on the lamp housing (ie the base), but the heat dissipation effect is often not good, and problems such as serious light decay, insufficient brightness, and reduced life of the LED often occur, resulting in more complaints and claims from customers.

LED rear fog lights generate a lot of heat when they work. When multiple LEDs are densely arranged, the accumulation of heat will be more serious. If the heat is not dissipated as soon as possible, the ensuing thermal effect will be very obvious, which will cause heat accumulation inside the chip, resulting in a series of problems such as decreased light efficiency and shortened service life. Therefore, in LED rear fog lamps, the structural design of the external radiator is very critical, which directly affects the heat dissipation capacity of the entire system. LED rear fog lights generally use 1W high-power LEDs. LED is a light-emitting tube with diode characteristics. It can only be energized in one direction, and its luminance output is proportional to the current passing through the LED. However, high-power LEDs will appear saturated under high current, and the luminous efficiency will be greatly reduced, or even fail.

It is not difficult to see that since the LED chip itself is greatly affected by heat, in the design of automotive LED rear fog lamps, the requirements for the heat dissipation structure of LED rear fog lamps are relatively high. In the existing LED rear fog lamps for automobiles, in order to meet the heat dissipation requirements of LEDs, the volume of the heat dissipation structure is generally relatively large.

In addition, the driving power supply of LED chips in LED rear fog lamps for automobiles is now widely used in DCDC (Direct Current Direct Current) structure, which is the DC power supply of LED chips. However, the structure of DCDC itself is relatively complicated, and the corresponding volume is relatively large. The large-volume automotive LED rear fog lights will inevitably bring some inconvenience to the design of the car; moreover, it will also cause a corresponding increase in the cost of the entire car LED rear fog lights.

Utility model content

In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide an LED rear fog lamp for automobiles, which is used to solve the problem that the LED rear fog lamps for automobiles in the prior art have large volume and poor heat dissipation effect, which seriously affects the LED rear fog lamp. The problem of chip life.

In order to achieve the above purpose and other related purposes, the utility model provides an LED rear fog lamp for automobiles, including a light distribution mirror, a lamp housing//reflective bowl, a substrate, a circuit board, at least one LED chip, a constant current power supply chip and a heat sink component; wherein, the constant current power supply chip and the LED chip are installed on the circuit board, and the constant current power supply chip provides power for the LED chip through the circuit board; the heat dissipation component includes a heat dissipation bottom plate and a plurality of heat dissipation bodies fixed on the lower surface of the heat dissipation bottom plate, and intervals are provided between adjacent heat dissipation bodies; the substrate is sealed and connected with the circuit board and the heat dissipation bottom plate.

Optionally, the heat dissipation component is an aluminum heat dissipation component; the substrate is an aluminum substrate.

Optionally, a plurality of heat sinks are arranged in an array and fixed on the lower surface of the heat dissipation bottom plate.

Optionally, the shape of the radiator is a cylinder or a cuboid.

Optionally, pins of the constant current power supply chip and the LED chip are fixedly installed on the circuit board; the chip bodies of the constant current power supply chip and the LED chip are in contact with the substrate.

Optionally, the substrate is sealed and connected to the circuit board and the heat dissipation bottom plate through glue or a sealing ring.

Optionally, the substrate includes a plurality of sub-substrates, and spaces are provided between adjacent sub-substrates.

Optionally, the number of the sub-substrates is determined by the number of the LED chips and the constant-current power supply chips, and the arrangement position of the sub-substrates is the same as that of the constant-current power supply chips and each of the LED chips. Corresponding.

Optionally, the LED rear fog lamp for automobiles includes 2 LED chips.

Optionally, the LED rear fog lamp for automobiles further includes a plurality of diodes, the diodes are connected between the LED chips and the constant current power supply, and the number of the diodes is related to the number of the LED chips .

As mentioned above, the LED rear fog lamp for automobiles of the present utility model adopts a constant current power supply chip to provide constant current power supply for the LED chip, and some modifications are made to the loose parts; moreover, the substrate of the present utility model adopts a split structure, so that The LED rear fog lamp for automobiles of the utility model has a simpler structure, small volume, good heat dissipation effect, realizes thermoelectric separation, reduces the mutual influence between electronic components, and effectively prevents LED damage caused by overheating of the rear fog lamp. The problems of low luminous intensity of the chip, serious light decay, damage to electronic components and the like, and the utility model also greatly reduces the production cost.

Description of drawings

Fig. 1 shows a schematic structural diagram of an LED rear fog lamp for automobiles disclosed in Embodiment 1 of the present utility model.

Fig. 2 is a top view of a heat dissipation component of an LED rear fog lamp for automobiles disclosed in Embodiment 1 of the present utility model.

Fig. 3 is a schematic structural diagram of an LED rear fog lamp for automobiles disclosed in Embodiment 2 of the present invention.

Fig. 4 is a schematic structural diagram of an LED rear fog lamp for automobiles disclosed in Embodiment 2 of the present invention after removing the cooling parts.

FIG. 5 is a schematic structural diagram of a substrate of an LED rear fog lamp for automobiles disclosed in Embodiment 2 of the present invention.

Component designation description

100 LED rear fog lights for cars

110 Substrate

111 The first substrate

112 second substrate

113 third substrate

120 circuit board

130 LED chips

131 The first LED chip

132 second LED chip

140 constant current power chip

150 cooling parts

151 heat sink

152 radiator

160 diodes

Detailed ways

The implementation of the present utility model is illustrated by specific specific examples below, and those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification.

It should be noted that the structures, proportions, sizes, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification, for those who are familiar with this technology to understand and read, and are not used to limit the implementation of the utility model Therefore, it has no technical substantive meaning. Any modification of structure, change of proportional relationship or adjustment of size shall still fall within the scope of The technical content disclosed by the utility model must be within the scope covered. At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit this specification. The practicable range of the utility model, and the change or adjustment of its relative relationship, without any substantial change in the technical content, shall also be regarded as the practicable scope of the utility model.

Example 1

This embodiment discloses a kind of LED rear fog lamp 100 for automobile, as shown in Fig. Part 150.

Both the LED chip 130 and the constant current power supply chip 140 are chips, including pins and a chip body. The pins are used to connect with external circuits, and the chip body is a silicon chip containing an integrated circuit. In this embodiment, the pins of the LED chip 130 and the constant current power supply chip 140 are fixedly installed on the circuit board 120 . The substrate 110 is sealed and connected to the circuit board 120 and the heat dissipation component 150 through glue or a sealing ring. In this embodiment, both the substrate 110 and the heat dissipation component 150 are made of aluminum for heat dissipation effect and cost consideration. The base plate 110, the circuit board 120 and the heat dissipation part 150 are placed in the corresponding positions of the lamp housing, and then fixed with the reflector bowl to form a lamp housing assembly, and finally welded together with the light distribution mirror to form the entire LED rear fog lamp 100 for automobiles.

In this embodiment, due to the consideration of the size and cost of the rear fog lamp, the existing DCDC structure that provides power for the LED chip 130 is changed to a constant current power chip 140 . Compared with the DCDC structure, the constant current power supply chip 140 has better stability: the output current is more stable, not affected by the load and the external environment (temperature); the volume is smaller; the cost is also lower.

In this embodiment, as shown in FIG. 2 , the heat dissipation component 150 includes a heat dissipation bottom plate 151 and a plurality of heat dissipation bodies 152 . The upper surface of the heat dissipation bottom plate 151 is in sealing connection with the substrate 110 . A plurality of radiators 152 are fixed on the lower surface of the heat dissipation bottom plate 151 , and the plurality of radiators 152 are arranged in an array on the lower surface of the heat dissipation bottom plate 151 . There is a certain interval between adjacent radiators 152 arranged in an array. By setting a certain distance between adjacent radiators 152 , the air circulation is accelerated, and the direction of change is also more conducive to the heat dissipation of the entire rear fog lamp 100 . In addition, the shape of the radiator 152 includes but not limited to a cylinder and a cuboid. In this embodiment, the radiator 152 is in the shape of a cylinder with better air circulation.

Further, in this embodiment, the pins of the LED chip 130 and the constant current power supply chip 140 are all fixedly installed on the circuit board 120, and the chip bodies of the LED chip 130 and the constant current power supply chip 140 are also in contact with the circuit board of.

When the automotive LED rear fog lamp 100 is working, the heat emitted by the LED chip 130 and the constant current power supply chip 140 is fully dissipated through the aluminum substrate 110 and the aluminum heat dissipation part 150, thereby further ensuring the life of the LED chip and light intensity.

Example 2

This embodiment discloses an LED rear fog lamp 100 for automobiles, as shown in Fig. 3 and Fig. LED chip 132 , constant current power supply chip 140 , heat dissipation component 150 and two diodes 160 .

Wherein, pins of the first LED chip 131 , the second LED chip 132 , the constant current power supply chip 140 and the diode 160 are all fixedly mounted on the circuit board 120 . The substrate 110 is sealed and connected with the circuit board 120 and the heat dissipation component 150 . In this embodiment, both the substrate 110 and the heat dissipation component 150 are made of aluminum for heat dissipation effect and cost consideration. The base plate 110, the circuit board 120 and the heat dissipation part 150 are placed in the corresponding positions of the lamp housing, and then fixed with the reflector bowl to form a lamp housing assembly, and finally welded together with the light distribution mirror to form the entire LED rear fog lamp 100 for automobiles.

In this embodiment, the DCDC structure in which the constant current power supply chip 140 simultaneously provides power to the first LED chip 131 and the second LED chip 132 is changed to the constant current power supply chip 140 .

Furthermore, as in the first embodiment, the heat dissipation component 150 also includes a heat dissipation bottom plate 151 and a plurality of heat dissipation bodies 152 as shown in FIG. 2 . I won't repeat them here.

Further, the pins of the first LED chip 131 , the second LED chip 132 , the constant current power supply chip 140 and the diode 160 in this embodiment are the same as those in Embodiment 1, and they are all fixedly installed on the circuit board 120 . However, the chip bodies of the first LED chip 131 , the second LED chip 132 and the constant current power supply chip 140 are different from those in Embodiment 1, and they are in direct contact with the substrate 110 . Since the substrate 110 is made of aluminum and is closely connected with the heat dissipation component 150, the chip body of the first LED chip 131, the second LED chip 132 and the constant current power supply chip 140 are directly connected with the substrate 110, which is more conducive to chip cooling. heat dissipation.

Moreover, in order to further ensure the heat dissipation of the first LED chip 131 and the second LED chip 132, the constant current power supply chip 140, and avoid the influence caused by the difference in heat dissipation between the chips, the substrate 110 is divided into a plurality of separate sub-units. substrate. The sub-substrates are located between the circuit board 120 and the heat dissipation bottom plate 151, the number and arrangement of which are determined by the LED chips and the constant current power supply chips, and there are spaces between adjacent sub-substrates.

In this embodiment, as shown in FIG. 4 and FIG. 5 , since the rear fog lamp 100 includes a first LED chip 131 , a second LED chip 132 and a constant current power supply chip 140 , correspondingly, the substrate 110 includes: a first The sub-substrate 111 , the second sub-substrate 112 and the third sub-substrate 113 . The position of the first sub-substrate 111 corresponds to the first LED chip 131 ; the position of the second sub-substrate 112 corresponds to the constant current power chip 140 ; the position of the third sub-substrate 113 corresponds to the second LED chip 132 . Moreover, there is a space between the first sub-substrate 111 and the second sub-substrate 112 , and there is a certain distance between the second sub-substrate 112 and the third sub-substrate 113 . By performing separate processing on the substrate 110 , the effect of thermoelectric separation is fully achieved. While the constant current power supply chip 140 provides constant current power for the first LED chip 131 and the second LED chip 132, this split substrate 110 makes the heat generated and emitted by the constant current power supply chip 140, the first LED The heat generated and emitted by the chip 131, and the heat generated and emitted by the second LED chip 132 do not affect each other, further ensuring the lifespan and luminous intensity of the LED chip.

Since there are two LED chips in this embodiment, correspondingly, there are also two diodes 160, one of which is connected between the first LED chip 131 and the constant current power supply chip 140, and the other is connected between the second LED chip 132 and the constant current power supply chip 140. Between the flow power chip 140, it is used to protect the first LED chip 131 and the second LED chip 132 against reverse.

In addition, in order to highlight the innovative part of the utility model, this embodiment does not introduce units that are not closely related to solving the technical problems proposed by the utility model, but this does not mean that there are no other units in this embodiment .

It should be noted that the illustrations provided in the embodiments of the present utility model are only schematically illustrating the basic idea of the present utility model, and only the components related to the present utility model are shown in the drawings rather than according to the actual implementation. The number, shape and size of components are drawn, and the type, quantity and ratio of each component can be changed at will during actual implementation, and the component layout type may also be more complicated.

In summary, the LED rear fog lamp for automobiles of the present utility model adopts a constant current power supply chip to provide constant current power supply for the LED chip, and some modifications are made to the loose parts; moreover, the substrate of the present utility model adopts a split structure, The structure of the LED rear fog lamp for automobiles of the utility model is simpler, the volume is small, and the heat dissipation effect is good, the thermoelectric separation is realized, the mutual influence between electronic components is reduced, and the overheating of the rear fog lamp is effectively prevented. The LED chip has problems such as low luminous intensity, serious light decay, and damage to electronic components, and the utility model also greatly reduces production costs. Therefore, the utility model effectively overcomes various shortcomings in the prior art and has high industrial application value.

The above-mentioned embodiments only illustrate the principles and effects of the present utility model, but are not intended to limit the present utility model. Anyone familiar with this technology can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the utility model should still be covered by the claims of the utility model.

Claims (10)

1. The utility model provides a fog lamp behind LED for car, includes lens, lamp body and reflector, its characterized in that, fog lamp still includes behind LED for car: the LED chip comprises a substrate, a circuit board, at least one LED chip, a constant current power supply chip and a heat dissipation component; wherein,

the constant current power supply chip and the LED chip are arranged on the circuit board, and the constant current power supply chip provides power for the LED chip through the circuit board;

the heat dissipation part comprises a heat dissipation bottom plate and a plurality of heat dissipation bodies fixed on the lower surface of the heat dissipation bottom plate, and an interval is arranged between every two adjacent heat dissipation bodies;

the substrate is hermetically connected with the circuit board and the heat dissipation bottom plate.

2. The LED rear fog lamp for the automobile according to claim 1, characterized in that: the heat dissipation part is an aluminum heat dissipation part; the substrate is an aluminum substrate.

3. The LED rear fog lamp for the automobile according to claim 1, characterized in that: the plurality of heat dissipation bodies are arranged and fixed on the lower surface of the heat dissipation bottom plate in an array mode.

4. The LED rear fog lamp for the automobile according to claim 3, characterized in that: the shape of the heat radiation body is a cylinder or a cuboid.

5. The LED rear fog lamp for the automobile according to claim 1, characterized in that: pins of the constant current power supply chip and the LED chip are fixedly arranged on the circuit board; the chip bodies of the constant current power supply chip and the LED chip are connected with the substrate.

6. The LED rear fog lamp for the automobile according to claim 1, characterized in that: the substrate is connected with the circuit board and the heat dissipation bottom plate in a sealing mode through glue or a sealing ring.

7. The LED rear fog lamp for the automobile according to claim 1, characterized in that: the substrate comprises a plurality of sub-substrates, and a space is arranged between every two adjacent sub-substrates.

8. The LED rear fog lamp for the automobile according to claim 7, characterized in that: the number of the sub-substrates is determined by the number of the LED chips and the number of the constant current source chips, and the arrangement positions of the sub-substrates correspond to the constant current source chips and each LED chip.

9. The LED rear fog lamp for the automobile according to claim 1, characterized in that: the automobile rear fog lamp comprises 2 LED chips.

10. The LED rear fog lamp for the automobile according to claim 1, characterized in that: the automobile rear fog lamp further comprises a plurality of diodes, the diodes are connected between the LED chips and the constant current power supply, and the number of the diodes is related to the number of the LED chips.