CN109296995B - LED lamp module and LED light source driving circuit - Google Patents

LED lamp module and LED light source driving circuit Download PDF

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Publication number
CN109296995B
CN109296995B CN201811298626.XA CN201811298626A CN109296995B CN 109296995 B CN109296995 B CN 109296995B CN 201811298626 A CN201811298626 A CN 201811298626A CN 109296995 B CN109296995 B CN 109296995B
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China
Prior art keywords
module
led light
dcdc
synchronous rectification
led
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CN201811298626.XA
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CN109296995A (en
Inventor
李佳颖
刘兰保
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HASCO Vision Technology Co Ltd
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HASCO Vision Technology Co Ltd
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Priority to CN201811298626.XA priority Critical patent/CN109296995B/en
Publication of CN109296995A publication Critical patent/CN109296995A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/47—Passive cooling, e.g. using fins, thermal conductive elements or openings
    • F21S45/48—Passive cooling, e.g. using fins, thermal conductive elements or openings with means for conducting heat from the inside to the outside of the lighting devices, e.g. with fins on the outer surface of the lighting device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/003—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
    • F21V23/004—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array arranged on a substrate, e.g. a printed circuit board
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
    • F21V29/508—Cooling arrangements characterised by the adaptation for cooling of specific components of electrical circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
    • F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Abstract

The invention provides an LED lamp module and an LED light source driving circuit, wherein the LED driving and the LED light source are designed on the same PCB board, and meanwhile, the invention provides an ingenious layout and a design method of an electronic and radiating system of a rear fog lamp, and under the condition of meeting the light attenuation requirement of a rear fog lamp optical system, the LED lamp module integrating the LED light source and the LED driving meets the requirements of miniaturization and standardization, so that one LED lamp module is suitable for the lamp body structures of all lamps; in addition, compared with the traditional resistance type or linear constant current type, the invention adopts the DCDC driving circuit, the driving efficiency is greatly improved, and the power consumption and the heat generated by the driving circuit can be greatly reduced, thereby greatly reducing the light attenuation of the LED light sources positioned on the same PCB board so as to meet the optical regulation and light distribution requirement. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

Description

LED lamp module and LED light source driving circuit
Technical Field
The invention relates to the technical field of LEDs, in particular to an LED lamp module and an LED light source driving circuit.
Background
The LED has the remarkable advantages of high response speed, low power consumption, energy conservation, long service life and the like. The LED is particularly suitable for the application of automobile front and rear lamps due to the rapid response speed of the LED. With the improvement of semiconductor materials and packaging processes, the luminous flux and the luminous efficiency of an LED light source are gradually improved, and the LED light source is widely applied to the field of automobile illumination. LED driving technology has also been developed gradually with the development of LED application technology.
As the LED is used as a light source of the rear fog lamp of the automobile, due to the requirement of regulations on the upper and lower limit values of the luminous flux of the optical system, the LED has high requirements on the light attenuation within 1 to 30 minutes: the small PCB system mounted with LEDs needs to meet a luminous flux decay of less than 10% in 1 to 30 minutes.
The luminous LED itself has the heat to produce, and the LED drive circuit that the drive LED lighted also can produce the heat simultaneously, and when LED self calorific capacity and LED driven heat accumulation together, just hardly control the light decay of LED. LED driving also has various control modes, mainly three modes: 1. resistance type has the lowest efficiency, large driving heating value and lowest cost; 2. the linear constant-current type has low efficiency, large driving heating value and moderate cost; and 3, the DCDC type has the highest efficiency, small driving heating value and higher cost.
Aiming at the requirements of the efficiency, the heating value and the light attenuation of the rear fog light optical system of the LED driving, the common rear fog light system design method comprises the following steps: the PCB provided with the LED light source is physically separated from the PCB provided with the LED drive, and the LED light source and the LED drive are electrically connected only by adopting a wire harness, so that the LED light source is far away from the heat source of the LED drive in principle to ensure that the LED achieves smaller light attenuation. The LED driving of this system design method may be resistive, linear constant current, or DCDC, since the light decay is no longer closely related to the form of LED driving.
However, due to the fact that the LED light source and the LED drive are physically separated, a large space is needed in the whole lamp structure of the lamp to respectively arrange the LED light source circuit board and the LED drive control board, and certain requirements are met for the space inside the lamp cavity. In the face of making thinner and smaller back lamp modeling designs, the system design scheme of the back fog lamp is more and more difficult to meet the lamp body modeling design, and meanwhile, the standardization is also difficult to achieve, so that the electronic control system of the back fog lamp is suitable for the lamp body structures of all vehicle types of back lamps.
The design method of the common rear fog lamp system comprises the following steps: the LED light source and the LED drive are placed on the same PCB, the LED drive adopts a simple resistance type or linear constant current mode, and the circuit of the LED drive part does not occupy excessive space because of only a few resistors or only one linear constant current chip, so the scheme can be designed in a miniaturized way, but the light attenuation of the optical system can not reach the expected effect because of the efficiency of the LED drive and the influence of the generated heat on the LED.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an objective of the present invention is to provide an LED lamp module and an LED light source driving circuit, which are used for solving the technical problems of large space occupation and serious light attenuation of the LED lamp module in the prior art.
To achieve the above and other related objects, the present invention provides an LED lamp module, including a printed circuit board, the LED lamp module further comprising: the LED light source component is arranged on the printed circuit board; the LED light source driving component and the LED light source component are arranged on the same board surface of the printed circuit board together; wherein, the LED light source driving part comprises a DCDC step-down control circuit;
in an embodiment of the invention, the LED lamp module further includes: and the heat radiating component is attached to the surface of the printed circuit board, which is opposite to the surface of the LED light source component and the surface of the LED light source driving component, so as to radiate heat from the printed circuit board and each component on the printed circuit board.
In an embodiment of the present invention, the external dimension of the printed circuit board is larger than the external dimension of the contact surface of the heat dissipation component and the printed circuit board, so as to form a circle of accommodating part for accommodating the sealing material.
In an embodiment of the invention, the printed circuit board connects the heat dissipation part with GND ground polarity on the printed circuit board through the antistatic fixing part, so as to prevent static charges from accumulating on the surface of the heat dissipation part.
In an embodiment of the invention, the LED lamp module further includes: a lens provided with a plurality of mounts; the printed circuit board is provided with a plurality of mounting holes matched with the mounting pieces; the mounting hole is used for the mounting piece to be inserted so as to fixedly connect the lens with the printed circuit board.
In an embodiment of the invention, the LED lamp module is a lamp LED module mounted on a vehicle; the power supply of the car light LED module is provided by a car body power supply; the DCDC step-down control circuit of the car light LED module comprises a current compensation circuit, and is used for compensating current for the DCDC step-down control circuit so as to meet the minimum current requirement of a car on the car light LED module; and/or the LED module is used for being disconnected when the LED module of the car lamp works abnormally so as to avoid false alarm of the car.
In an embodiment of the invention, the LED lamp module includes an LED light source component located at a center of a board surface of the printed circuit board; the LED light source driving part comprises a plurality of electronic components, and the electronic components are closely arranged around the periphery of the LED light source part except for a heat dissipation copper-clad area.
In one embodiment of the present invention, the DCDC buck control circuit includes: the input filtering module is used for filtering harmonic waves of an access power supply; the reverse connection prevention module is electrically connected with the input filtering module and used for reverse connection protection; the compensation current module is electrically connected with the reverse connection preventing module and is used for outputting compensation current; and the DCDC synchronous rectification voltage reduction module is electrically connected with the compensation current module and used for outputting constant current and voltage to supply power to the LED light source component. The electromagnetic compatibility module is electrically connected with the synchronous rectification voltage reduction module and is used for reducing electromagnetic noise of an output power supply of the synchronous rectification voltage reduction module; and the output filtering module is used for filtering out the harmonic wave of the output power supply.
In an embodiment of the invention, the input filtering module includes a first filtering circuit; to achieve the above and other related objects, the present invention provides an LED light source driving circuit for driving an LED light source component, which is disposed on the same board surface of the printed circuit board together with the LED light source component, the LED light source driving circuit specifically comprising: the input filtering module is used for filtering harmonic waves of an access power supply; the reverse connection prevention module is electrically connected with the input filtering module and used for reverse connection protection; the compensation current module is electrically connected with the reverse connection preventing module and is used for outputting compensation current; and the DCDC synchronous rectification voltage reduction module is electrically connected with the compensation current module and used for outputting constant current and voltage to supply power to the LED light source component. The electromagnetic compatibility module is electrically connected with the synchronous rectification voltage reduction module and is used for reducing electromagnetic noise of an output power supply of the synchronous rectification voltage reduction module; and the output filtering module is used for filtering out harmonic waves of the output power supply.
The anti-reverse connection module comprises a diode, and the anode of the diode is connected with the first filter circuit; the compensation current module comprises a switching circuit; the DCDC synchronous rectification BUCK module comprises a DCDC synchronous rectification BUCK chip, and a MOSFET (metal oxide semiconductor field effect transistor) switch tube and a synchronous rectification MOSFET tube are integrated in the DCDC synchronous rectification BUCK chip; the electromagnetic compatibility module comprises a resistor and a capacitor which are connected in series; the output filter module comprises a second filter circuit; the external power supply flows through the reverse connection preventing module after passing through the input filtering module; the negative electrode of the reverse connection prevention module is connected with a power supply pin of the DCDC synchronous rectification voltage reduction module, is connected with the compensation current module through a first resistor, is connected with a first decoupling capacitor with one end grounded, and is also connected with an enabling pin of the DCDC synchronous rectification voltage reduction module through a second resistor; the PG pin of the DCDC synchronous rectification buck module is connected with the compensation current module through a third resistor so as to activate and conduct the compensation current module when a high level is output; the PG pin of the DCDC synchronous rectification voltage reduction module is also connected to the VCC pin of the DCDC synchronous rectification voltage reduction module through a fourth resistor, and is connected with a second decoupling capacitor with one end grounded through the fourth resistor; the BOOT pin of the DCDC synchronous rectification voltage reduction module is connected with one end of the electromagnetic compatibility module; the other end of the electromagnetic compatibility module is connected with an output pin of the DCDC synchronous rectification voltage reduction module; the output pin of the DCDC synchronous rectification voltage reduction module is also connected with one end of an energy storage inductor, the other end of the energy storage inductor is connected with one end of the output filter module, and the other end of the output filter module is grounded; the junction of the energy storage inductor and the output filter module is also connected with the anode of the LED light source, the cathode of the LED light source is connected with the FB pin of the DCDC synchronous rectification voltage reduction module through a fifth resistor, and the cathode of the LED light source is grounded through a sixth resistor.
As described above, the LED lamp module and the LED light source driving circuit have the following beneficial effects: according to the invention, the LED drive and the LED light source are designed on the same PCB, and meanwhile, the ingenious layout and the design method of the electronic and heat dissipation system of the rear fog lamp are provided, so that the LED light source and the LED drive integrated LED lamp module can meet the requirements of miniaturization and standardization under the condition of meeting the light attenuation requirement of the rear fog lamp optical system, and one LED lamp module is suitable for the lamp body structures of all lamps; in addition, compared with the traditional resistance type or linear constant current type, the invention adopts the DCDC driving circuit, the driving efficiency is greatly improved, and the power consumption and the heat generated by the driving circuit can be greatly reduced, thereby greatly reducing the light attenuation of the LED light sources positioned on the same PCB board so as to meet the optical regulation and light distribution requirement. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value. In addition, the anti-static screw is used for connecting the radiator with the GND through the anti-static bonding pad, so that static charges LED into the radiator from the outside can be discharged to the ground at the shortest path and the highest speed, and damage to the LED and electronic components is avoided.
Drawings
Fig. 1a is a schematic diagram of a portion of a small electronic assembly and a heat sink of an LED lamp module according to an embodiment of the invention.
Fig. 1b is a schematic diagram of a combined structure of a lens, an electronic component assembly and a heat sink of an LED lamp module according to an embodiment of the invention.
Fig. 1c is a schematic diagram showing a disassembled structure of a lens, an electronic assembly and a heat sink of an LED lamp module according to an embodiment of the invention.
Fig. 2 is a schematic diagram of an LED driving circuit of an LED lamp module according to an embodiment of the invention.
Description of element reference numerals
101. Lens
102 PCB (printed circuit board)
103. Radiator
104 LED light source
105. Electronic component
106. Heat-dissipation rubber cushion layer
107. Fixing screw
108. Antistatic screw
109. Radiating rib
110. Sealing rubber ring
111. Wire outlet hole
112. Wire inlet hole
113. Bonding pad
114. Lens positioning part
115. Module mounting part
M1 input filter module
M2 output filter module
M3 DCDC synchronous rectification voltage reduction module
M4 electromagnetic compatibility module
M5 compensation current module
M7 reverse connection preventing module
R4 first resistor
R1 second resistor
R9 third resistor
R8 fourth resistor
R3 fifth resistor
R7 sixth resistor
C4, C6 capacitor
L2 energy storage inductor
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
It is noted that in the following description, reference is made to the accompanying drawings, which describe several embodiments of the present application. It is to be understood that other embodiments may be utilized and that mechanical, structural, electrical, and operational changes may be made without departing from the spirit and scope of the present application. The following detailed description is not to be taken in a limiting sense, and the scope of embodiments of the present application is defined only by the claims of the issued patent. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Spatially relative terms, such as "upper," "lower," "left," "right," "lower," "below," "lower," "above," "upper," and the like, may be used herein to facilitate a description of one element or feature as illustrated in the figures relative to another element or feature.
Furthermore, as used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes," and/or "including" specify the presence of stated features, operations, elements, components, items, categories, and/or groups, but do not preclude the presence, presence or addition of one or more other features, operations, elements, components, items, categories, and/or groups. The terms "or" and/or "as used herein are to be construed as inclusive, or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a, A is as follows; b, a step of preparing a composite material; c, performing operation; a and B; a and C; b and C; A. b and C). An exception to this definition will occur only when a combination of elements, functions or operations are in some way inherently mutually exclusive.
The invention provides a smart layout and design method of an electronic and radiating system of a rear fog lamp, which combines DCDC type high-efficiency LED driving, designs an LED driving and an LED light source on the same PCB board, and enables the LED light source and the LED driving integrated LED lamp module to achieve the requirements of miniaturization and standardization under the condition of meeting the light attenuation requirement of the rear fog lamp optical system, so that one LED lamp module is suitable for lamp body structures of all lamps. The implementation principle of the technical scheme of the present invention will be described below with reference to the embodiments and the accompanying drawings.
As shown in fig. 1a to 1c, a schematic structural diagram of an LED lamp module according to an embodiment of the invention is shown. The LED lamp module is mainly composed of a lens, an electronic component sub-assembly and a radiator 103, fig. 1a shows a partial structure diagram composed of the electronic component sub-assembly and the radiator 103, fig. 1b shows a combined structure diagram of the lens 101, the electronic component sub-assembly and the radiator 103, and fig. 1c shows a disassembled structure diagram of the lens 101, the electronic component sub-assembly and the radiator 103.
The electronics assembly includes a PCB board 102, LED light sources 104, and driver electronics 105. The LED light source 104 is preferably disposed at the center of the PCB 102, so that the LED lamp module has more uniform light emitting brightness and better light emitting effect. The board material of the PCB 102 is preferably a double-sided glass fiber board FR-4 or an aluminum substrate board with excellent flame resistance, and of course, a common board 94HB, a flame retardant board 94V0, a single-sided half glass fiber board 22F, CEM-1, a CEM-3, etc. may also be selected, which is not limited in the present invention.
The driver electronic component 105 refers to a plurality of electronic components 105 disposed on the PCB 102, and only one electronic component 105 is selected as an example in fig. 1. The driver electronic components 105 are arranged in a spread-out distribution centered on the LED light source 104, and the electronic components 105 are preferably arranged in an area outside the spread-out radius of 4cm centered on the LED light source 104.
It should be noted that, in the conventional LED module, the PCB with the LED light source 104 is usually physically separated from the PCB board 102 with the LED driver, and the LED light source 104 is electrically connected to the LED driver only by using a wire harness, so that the LED light source 104 is in principle far away from the LED driver to ensure that the LED achieves smaller light attenuation. However, the LED light source 104 and the LED driver of the present invention are designed in an integrated layout, which greatly reduces the volume of the LED lamp module and simplifies the structure of the wiring system. In particular, when applied to a rear fog lamp of a vehicle, the small-sized LED lamp module of the invention enables the rear fog lamp module to be miniaturized and standardized, and can be installed at any position of the whole lamp structure, so the module can be defined as a standard light source. In addition, the LED lamp module simplifies the manufacturing process through the integrated design, and the integrated design is similar to the integrated design, so that the manufacturing process is simplified, and compared with the traditional mode of physically separating the LED light source 104 circuit board from the driving board, the LED and driving matching connection process in the production process and the damage risk possibly brought in the installation connection process are avoided.
A heat dissipation rubber cushion layer 106 is attached to the surface of the base of the heat sink 103, and the pcb 102 is fixed on the heat dissipation rubber cushion layer 106 through a fixing screw 107 and an antistatic screw 108, so as to be tightly fixed with the heat sink 103. It should be noted that the anti-static screw 108 is used to connect the heat sink 103 with the electrostatic screw pad 113 on the PCB 102, i.e. GND ground, so that the heat sink 103 can be directly connected with GND ground or indirectly connected with GND ground through an electrostatic capacitor, so that the ESD electrostatic charges accumulated on the metal surface of the heat sink 103 can be smoothly LED to the GND path, thereby protecting the LED light source 104 from the ESD electrostatic.
Preferably, the base of the heat spreader 103, the plurality of cylindrical heat dissipating ribs 109 and the wire inlet holes 112 are integrally formed, and the integrally formed structure is made of a material with high thermal conductivity to facilitate heat dissipation, for example: pure aluminum, aluminum magnesium alloy or copper alloy or other metal or metal alloy material.
Preferably, the external dimension of the PCB 102 is larger than the external dimension of the base of the heat sink 103, so as to form a circle of accommodating portion with the heat sink 103. The ring accommodating part can be used for sleeving a ring of sealing rubber ring 111, so that the sealing waterproof effect is achieved after the LED lamp module is installed on the lamp body structure of the vehicle.
Preferably, the positive and negative power supply wires or PIN needles of the LED lamp module pass through the wire inlet holes 112 arranged on the radiator 103 from bottom to top, pass through the radiator 103 and the wire outlet holes 111 of the PCB 102, and bend and weld the conductive ends of the wire inlet holes or PIN needles on the positive and negative bonding pads 113 on the PCB 102, so that the power supply of the LED lamp module can be introduced. In an embodiment in which the LED light module is mounted on a vehicle, the anode and cathode power supply wires are LED from the vehicle body to the LED light module through the wire inlet holes 112 and the wire outlet holes 111. It should be noted that, in order to fix and insulate the connection wires passing through the wire inlet holes and the wire outlet holes, an insulating glue may be injected into the wire inlet holes 112, and the insulating glue is semi-liquid when injected, solid after solidification, and may play a role in both fixing and insulating.
The PCB 102 is provided with a plurality of lens positioning portions 114 for positioning the lens on the PCB 102. Preferably, the plurality of lens positioning portions 114 are uniformly dispersed on the PCB 102, so that the lens can be more firmly positioned. The lens positioning portion 114 may be a positioning hole, a positioning pin, a positioning groove, or the like, and the number of the lens positioning portions 114 is not limited in the present invention, and may be 2 or 3 or more, and the following description will be made on how the lens is mounted on the PCB 102 by taking 3 positioning holes as an example. The PCB 102 is uniformly provided with a lens mounting hole 1, a lens mounting hole 2 and a lens mounting hole 3, and the depth of each lens mounting hole can be extended to the radiator 103 below the PCB 102 according to actual requirements. The lens is provided with positioning columns corresponding to the positions and the sizes of the 3 lens mounting holes, and the lens can be mounted on the PCB 102 by inserting the positioning columns of the lens into the lens mounting holes of the PCB 102. It should be noted that, fixing modes such as glue bonding, interference fit, welding connection or threaded connection can be adopted between the positioning column and the positioning hole.
The LED lamp module further includes a standard module mounting portion 115 for fixing the LED lamp module to an external device. The standard module mounting portion 115 may be a mounting hole, a mounting slot, a mounting pin, or the like. Taking the mounting hole as an example, when the LED lamp module is mounted on the vehicle, the external mounting piece can be inserted into the mounting hole so as to fix the LED lamp module on the vehicle. It should be noted that, the LED lamp module provided by the invention may be mounted on the whole lamp body besides being mounted on a vehicle, and the invention is not limited thereto.
Preferably, the DCDC driving circuit is adopted in the LED lamp module, so that the driving efficiency is greatly improved compared with that of the conventional resistive or linear constant current type, and the power consumption and the heat generated by the driving circuit can be greatly reduced, thereby greatly reducing the light attenuation of the LED light source 104 positioned on the same PCB 102, and meeting the optical regulation and light distribution requirements. The driving principle of the DCDC driving circuit will be described below with reference to the accompanying drawings.
As shown in fig. 2, a circuit schematic of an LED driving circuit according to an embodiment of the invention is shown. The LED driving circuit comprises an input filtering module M1, an output filtering module M2, a DCDC synchronous rectification voltage reduction module M3, an electromagnetic compatibility module M4, a compensation current module M5 and an anti-reverse connection module M7. The input filter module M1 specifically comprises a filter circuit, wherein the filter circuit can adopt a passive filter circuit or an active filter circuit, the passive filter current mainly comprises a capacitance filter circuit, an inductance filter circuit and a complex test filter circuit, and the active filter circuit mainly comprises an RC filter circuit; the filter circuit itself is a prior art, and therefore will not be described in detail. The output filter module M2 is implemented in a similar manner to the input filter module M1. The DCDC synchronous rectification BUCK module M3 comprises a DCDC synchronous rectification BUCK chip, a MOSFET (metal oxide semiconductor field effect transistor) switch tube and a synchronous rectification MOSFET are integrated in the DCDC synchronous rectification BUCK chip, and the DCDC synchronous rectification BUCK module M also comprises components such as an inductor, a capacitor and a resistor; the DCDC synchronous rectification BUCK chip is the prior art, so that the description is omitted. The electromagnetic compatibility module M4 includes a resistor and a capacitor connected in series. The compensation current module M5 includes a switching circuit, which is a circuit having two states of "on" and "off", and the switching circuit itself is not described in detail in the prior art. The reverse connection preventing module M7 comprises a diode which is conducted in one direction.
Specifically, the input power VBAT flows through the reverse connection preventing module M7 after passing through the input filtering module M1; the positive electrode of the reverse connection prevention module M7 of the input filter module is connected with the input filter module M1, and the negative electrode of the reverse connection prevention module M is respectively connected with one end of a power supply pin IN and one end of a compensation current first resistor R4 of the DCDC synchronous rectification voltage reduction module M3; the capacitor C4 is a first decoupling capacitor C4 of a power supply pin IN of the DCDC synchronous rectification buck module M3, and one end of the first decoupling capacitor C4 is connected with the pin IN while the other end is grounded; the enabling pin EN of the DCDC synchronous rectification BUCK chip is connected to the power supply pin IN through the pull-up second resistor R1, and the DCDC synchronous rectification BUCK module M3 can work normally when the enabling pin EN is pulled to a high level; the PG pin of the DCDC synchronous rectification buck module M3 is connected to the VCC pin through a fourth resistor R8, and the PG pin is connected with a current limiting third resistor R9; the other end of the current-limiting third resistor R9 is connected with the enabling port of the compensation current module M5, and is used for activating and conducting the enabling port of the compensation current module M5 when the PG pin outputs high level, so that compensation current flows from the conducted compensation current module M5 to the GND ground through the first resistor R4 to form a current loop, and the purpose of compensation current is achieved.
The VCC pin of the DCDC synchronous rectification buck module M3 is connected with a second decoupling capacitor C6 with one port, and the other end of the second decoupling capacitor C6 is connected to the ground; the GND pin of the DCDC synchronous rectification buck module M3 is connected to the ground; the BOOT pin of the DCDC synchronous rectification buck module M3 is connected with an electromagnetic compatibility module M4, the electromagnetic compatibility module comprises an RC circuit, a resistor R in the RC circuit is connected with a capacitor C in series, the capacitor C is a boost capacitor, and floating MOSFET driving energy in the M3 chip is provided; the other end of the RC circuit is connected with an OUT pin of the DCDC synchronous rectification voltage reduction module M3, and the OUT pin is an output port of the PWM modulation square wave and has larger electromagnetic noise, so that the resistor R in the RC circuit is used for slowing down the upper edge and the lower edge of the square wave so as to reduce EMC energy radiated to the outside; the OUT pin of the DCDC synchronous rectification voltage reduction module M3 is connected with one end of an energy storage inductor L2, the other end of the energy storage inductor L2 is connected with an output filter module M2, and the other end of the output filter module M2 is connected with GND.
The DCDC synchronous rectification step-down module M3, the output filter module M2 and the connection structure and the relative layout position of the energy storage inductor L2 form a BUCK step-down topology of DCDC; the intersection point of the energy storage inductor L2 and the output filter module M2 is connected with the positive electrode of an LED light source, the negative electrode of the LED light source is connected with one end of a sixth sampling resistor R7, the other end of the sixth sampling resistor R7 is connected with GND (ground), the intersection point of the negative electrode of the LED light source and R7 is connected with a fifth resistor R3, and the other end of the fifth resistor R3 is connected to a feedback pin FB pin of the DCDC synchronous rectification voltage reduction module M3; the feedback pin FB pin is used for transmitting signals to the DCDC synchronous rectification voltage reduction module M3 in real time by collecting the voltage at the intersection point of the sixth resistor R7 and the negative electrode of the LED light source, so that the chip M3 can adjust the duty ratio of PWM modulation waves output by the OUT pin in real time according to the voltage fed back by the FB pin, the voltage at two ends of the sixth resistor R7 is constant, and the purpose of constant flowing through the LED current is achieved. The current flowing through the sixth resistor R7 is similar to the current flowing through the LED light source.
Notably, the LED driving circuit provided by the invention can meet the requirement that the current flowing through the LED light source is constant under the voltage change of 9-16V of the vehicle body of the rear fog lamp module, so that the stability of luminous flux is ensured; meanwhile, the LED driving circuit can work at 70% -85% of efficiency to reduce the power consumption and heat of the control circuit. Compared with the existing resistance type or linear constant current type rear fog lamp module, the heat power consumption generated by the LED driving circuit is greatly reduced, so that the light attenuation of the LED on the structural system is greatly reduced.
In addition, it should be noted that the current compensation circuit in the LED driving circuit is used for compensating corresponding currents for the LED lamp modules with different current values to meet the minimum current requirement, and/or is used for being disconnected when the vehicle body module works abnormally so as to avoid false alarm.
Specifically, the current compensation circuit can meet the requirements of LEDs with different brightness gears, and the minimum current requirements of the automobile body on the normal operation of the LED module are met by matching the sizes of different compensation currents. Taking a rear fog lamp of a vehicle as an example: when the rear fog lamp LED modules with 3 brightness levels are used for supplying goods, in order to ensure that the output luminous fluxes of all the rear fog lamp LED modules are consistent, the set LED current values corresponding to LEDs with different brightness levels are different, and when the LEDs with high brightness can reach the set luminous flux values under the condition that lower current values are needed by the LEDs with high brightness, the total consumption current of the modules under the LED current values is possibly smaller than the current detection value set by the BCM for judging the normal operation of the lamp, the current false alarm can be caused under the condition, namely, the rear fog lamp LED modules work normally clearly, but the BCM can judge the lamp fault due to the fact that the current does not reach the standard. The current compensation circuit formed by the first resistor R4, the compensation current module M5 and the third resistor R9 can solve the problem. When the LED light source fails, the chip M3 can detect open circuit and short circuit faults, so that the work of the chip M3 is closed, and meanwhile, a low level is output through the PG pin, so that the switching circuit of the compensation current module M5 does not work, and the compensation current circuit is not conducted. When the LED fault is reached, the DCDC normal working circuit and the LED current compensation circuit are cut off at the same time, so that the fault detection current is smaller than a certain set value, and the vehicle body fault alarm requirement is met.
It should be noted that the technical solution of the present invention can be applied to a rear fog lamp LED module, but is not limited thereto. The technical scheme of the invention is based on the same principle as above, and can be expanded to the functions of the whole back light and even the signal light in the front light, and all the signal lights can be designed in the concept of the standardized module.
In order to facilitate a better understanding of the technical solution of the present invention by a person skilled in the art, the following explains the correspondence between the mechanical structure of the LED lamp module and the circuit diagram device with reference to fig. 1a, 1b, 1c and 2. The LED light sources in fig. 1a to 1c are the LED light sources in the circuit diagram of fig. 2, and the LED light sources are preferably arranged at the central position of the PCB board, and the heat dissipation performance of the LED light sources can be enhanced by adding dense heat dissipation holes around the LED light sources on the PCB. The other electronic components in fig. 2, except for the LED light sources, are arranged on the PCB board around the LED light sources. The VBAT and GND supply polarity traces in fig. 2 run through traces on the PCB to the positive and negative pads in fig. 1 a.
The embodiment of the LED light source driving circuit provided by the invention is similar to the embodiment of the LED driving circuit in the LED lamp module, so that the description is omitted.
In summary, the LED lamp module and the LED light source driving circuit provided by the invention design the LED driving and the LED light source on the same PCB board, and simultaneously propose a smart layout and design method of the electronic and heat dissipation system of the rear fog lamp, which can make the LED lamp module integrating the LED light source and the LED driving achieve the miniaturization and standardization requirements under the light attenuation requirement of the rear fog lamp optical system, so that one LED lamp module is suitable for the lamp body structure of all lamps; in addition, compared with the traditional resistance type or linear constant current type, the invention adopts the DCDC driving circuit, the driving efficiency is greatly improved, and the power consumption and the heat generated by the driving circuit can be greatly reduced, thereby greatly reducing the light attenuation of the LED light sources positioned on the same PCB board so as to meet the optical regulation and light distribution requirement. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (7)

1. The utility model provides a LED lamps and lanterns module, its characterized in that includes printed circuit board, LED lamps and lanterns module still includes:
the LED light source component is arranged on the printed circuit board;
the LED light source driving component and the LED light source component are arranged on the same board surface of the printed circuit board together; wherein, the LED light source driving part comprises a DCDC step-down control circuit;
wherein, DCDC step-down control circuit includes: the input filtering module is used for filtering harmonic waves of an access power supply; the reverse connection prevention module is electrically connected with the input filtering module and used for reverse connection protection; the compensation current module is electrically connected with the reverse connection preventing module and is used for outputting compensation current; the DCDC synchronous rectification voltage reduction module is electrically connected with the compensation current module and is used for outputting constant current and voltage to supply power to the LED light source component; the electromagnetic compatibility module is electrically connected with the synchronous rectification voltage reduction module and is used for reducing electromagnetic noise of an output power supply of the synchronous rectification voltage reduction module; the output filter module is used for filtering out harmonic waves of an output power supply;
the input filtering module comprises a first filtering circuit;
the anti-reverse connection module comprises a diode, and the anode of the diode is connected with the first filter circuit;
the compensation current module comprises a switching circuit;
the DCDC synchronous rectification BUCK module comprises a DCDC synchronous rectification BUCK chip, and a MOSFET (metal oxide semiconductor field effect transistor) switch tube and a synchronous rectification MOSFET tube are integrated in the DCDC synchronous rectification BUCK chip;
the electromagnetic compatibility module comprises a resistor and a capacitor which are connected in series;
the output filter module comprises a second filter circuit;
the external power supply flows through the reverse connection preventing module after passing through the input filtering module; the negative electrode of the reverse connection prevention module is connected with a power supply pin of the DCDC synchronous rectification voltage reduction module, is connected with the compensation current module through a first resistor, is connected with a first decoupling capacitor with one end grounded, and is also connected with an enabling pin of the DCDC synchronous rectification voltage reduction module through a second resistor; the PG pin of the DCDC synchronous rectification buck module is connected with the compensation current module through a third resistor so as to activate and conduct the compensation current module when a high level is output; the PG pin of the DCDC synchronous rectification voltage reduction module is also connected to the VCC pin of the DCDC synchronous rectification voltage reduction module through a fourth resistor, and is connected with a second decoupling capacitor with one end grounded through the fourth resistor; the BOOT pin of the DCDC synchronous rectification voltage reduction module is connected with one end of the electromagnetic compatibility module; the other end of the electromagnetic compatibility module is connected with an output pin of the DCDC synchronous rectification voltage reduction module; the output pin of the DCDC synchronous rectification voltage reduction module is also connected with one end of an energy storage inductor, the other end of the energy storage inductor is connected with one end of the output filter module, and the other end of the output filter module is grounded; the connection part of the energy storage inductor and the output filter module is also connected with the anode of the LED light source, the cathode of the LED light source is connected with the FB pin of the DCDC synchronous rectification voltage reduction module through a fifth resistor, and the cathode of the LED light source is grounded through a sixth resistor;
the heat dissipation component is attached to the surface of the printed circuit board, which is opposite to the surface of the LED light source component and the surface of the LED light source driving component, so as to dissipate heat from the printed circuit board and each component on the printed circuit board; a heat-dissipating rubber cushion layer is attached to the surface of the base of the heat-dissipating component; the printed circuit board is fixed on the heat dissipation rubber cushion layer through a fixing piece so as to be tightly fixed with the heat dissipation component.
2. The LED light fixture module of claim 1 wherein the printed circuit board has a larger overall dimension than a surface of the heat sink in contact with the printed circuit board to form a ring of receptacles for receiving the sealing material.
3. The LED luminaire module of claim 1, wherein the printed circuit board connects the heat sink with GND ground on the printed circuit board through an anti-static mount to prevent static charge from accumulating on the surface of the heat sink.
4. The LED light fixture module of claim 1, wherein the LED light fixture module further comprises:
a lens provided with a plurality of mounts; the printed circuit board is provided with a plurality of mounting holes matched with the mounting pieces; the mounting hole is used for the mounting piece to be inserted so as to fixedly connect the lens with the printed circuit board.
5. The LED light fixture module of claim 1 wherein the LED light fixture module is a vehicle lamp LED module mounted on a vehicle; the power supply of the car light LED module is provided by a car body power supply; the DCDC step-down control circuit of the car light LED module comprises a current compensation circuit, and is used for compensating current for the DCDC step-down control circuit so as to meet the minimum current requirement of a car on the car light LED module; and/or the LED module is used for being disconnected when the LED module of the car lamp works abnormally so as to avoid false alarm of the car.
6. The LED light fixture module of claim 1 wherein the LED light fixture module includes an LED light source component positioned at a center of the board surface of the printed circuit board; the LED light source driving part comprises a plurality of electronic components, and the electronic components are closely arranged around the periphery of the LED light source part except for a heat dissipation copper-clad area.
7. The utility model provides a LED light source drive circuit which characterized in that is used for driving LED light source part, and with the same face of printed circuit board is located jointly to LED light source part, LED light source drive circuit specifically includes:
the input filtering module is used for filtering harmonic waves of an access power supply;
the reverse connection prevention module is electrically connected with the input filtering module and used for reverse connection protection;
the compensation current module is electrically connected with the reverse connection preventing module and is used for outputting compensation current;
the DCDC synchronous rectification voltage reduction module is electrically connected with the compensation current module and is used for outputting constant current and voltage to supply power to the LED light source component;
the electromagnetic compatibility module is electrically connected with the synchronous rectification voltage reduction module and is used for reducing electromagnetic noise of an output power supply of the synchronous rectification voltage reduction module;
the output filter module is used for filtering out harmonic waves of an output power supply;
the input filtering module comprises a first filtering circuit;
the anti-reverse connection module comprises a diode, and the anode of the diode is connected with the first filter circuit;
the compensation current module comprises a switching circuit;
the DCDC synchronous rectification BUCK module comprises a DCDC synchronous rectification BUCK chip, and a MOSFET (metal oxide semiconductor field effect transistor) switch tube and a synchronous rectification MOSFET tube are integrated in the DCDC synchronous rectification BUCK chip;
the electromagnetic compatibility module comprises a resistor and a capacitor which are connected in series;
the output filter module comprises a second filter circuit;
the external power supply flows through the reverse connection preventing module after passing through the input filtering module; the negative electrode of the reverse connection prevention module is connected with a power supply pin of the DCDC synchronous rectification voltage reduction module, is connected with the compensation current module through a first resistor, is connected with a first decoupling capacitor with one end grounded, and is also connected with an enabling pin of the DCDC synchronous rectification voltage reduction module through a second resistor; the PG pin of the DCDC synchronous rectification buck module is connected with the compensation current module through a third resistor so as to activate and conduct the compensation current module when a high level is output; the PG pin of the DCDC synchronous rectification voltage reduction module is also connected to the VCC pin of the DCDC synchronous rectification voltage reduction module through a fourth resistor, and is connected with a second decoupling capacitor with one end grounded through the fourth resistor; the BOOT pin of the DCDC synchronous rectification voltage reduction module is connected with one end of the electromagnetic compatibility module; the other end of the electromagnetic compatibility module is connected with an output pin of the DCDC synchronous rectification voltage reduction module; the output pin of the DCDC synchronous rectification voltage reduction module is also connected with one end of an energy storage inductor, the other end of the energy storage inductor is connected with one end of the output filter module, and the other end of the output filter module is grounded; the connection part of the energy storage inductor and the output filter module is also connected with the anode of the LED light source, the cathode of the LED light source is connected with the FB pin of the DCDC synchronous rectification voltage reduction module through a fifth resistor, and the cathode of the LED light source is grounded through a sixth resistor;
the heat dissipation component is attached to the surface of the printed circuit board, which is opposite to the surface of the LED light source component and the surface of the LED light source driving component, so as to dissipate heat from the printed circuit board and each component on the printed circuit board; a heat-dissipating rubber cushion layer is attached to the surface of the base of the heat-dissipating component; the printed circuit board is fixed on the heat dissipation rubber cushion layer through a fixing piece so as to be tightly fixed with the heat dissipation component.
CN201811298626.XA 2018-11-02 2018-11-02 LED lamp module and LED light source driving circuit Active CN109296995B (en)

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