CN203068208U

CN203068208U - Light-emitting diode (LED) light source

Info

Publication number: CN203068208U
Application number: CN2013200072710U
Authority: CN
Inventors: 杨波; 杨世红
Original assignee: Shaanxi Reactor Microelectronics Co Ltd
Current assignee: Shaanxi Reactor Microelectronics Co Ltd
Priority date: 2013-01-08
Filing date: 2013-01-08
Publication date: 2013-07-17
Anticipated expiration: 2023-01-08

Abstract

The utility model provides a light-emitting diode (LED) light source which comprises a heat conducting base plate. At least two LED series chips which are connected in series are packaged on the heat conducting base plate. A linear high-voltage LED driving chip which is used for adjusting the lighting state of the LED series chips according to an input voltage is further packaged on the heat conducting base plate. The linear high-voltage LED driving chip is connected with the LED series chips. Each LED series chip is formed by the fact that a plurality of LED grains are connected in series or connected in a series-parallel-combination mode. The linear high-voltage LED driving chip is a driving integrated circuit which controls the at least two LED series chips to light through the input voltage. According to the LED light source, the LED series chips and a linear high-voltage LED driver are integrated on the heat conducting base plate, so that full integration of the LED light source and the driver is achieved, an LED lighting product utilizing the LED light source does not need a switch power supply or a driver any longer, the structure of an LED lamp is simplified, and production cost is greatly lowered.

Description

A kind of led light source

Technical field

The utility model relate to light emitting diode (Light Emitting Diode, hereinafter to be referred as: LED) lighting field relates in particular to a kind of led light source.

Background technology

Led light source becomes the main product of new generation of green illumination with its efficient height, long characteristics of life-span.Because the characteristic of the low-voltage of LED own and unidirectional conducting when using the civil power driving LED, need change line voltage into the DC voltage that led light source can be used, and control the electric current by LED simultaneously.At present, Switching Power Supply becomes the first-selected power supply of LED illuminating product with its efficient height, characteristics that relative volume is little.But Switching Power Supply all comprises the bigger device of these volumes of electrolytic capacitor, transformer or inductor, not only is difficult to make the volume of led light source further to reduce, and also is far smaller than the service life of led light source the service life of Switching Power Supply.

The LED lighting of some companies adopts Linear Driving on the market now, overcome the shortcoming that the Switching Power Supply volume is big, the life-span is short to a certain extent, but the LED illuminating product on the market still uses the led light source of configuration Standalone Drives, and the configuration independent driver is not solved shortcomings such as LED light fixture complicate fabrication process, weak heat-dissipating, reliability are low effectively.

The utility model content

The purpose of this utility model is to solve the shortcoming of above-mentioned LED illuminating product, provides a kind of driver and LED are integrated in fully integrated led light source on the heat-conducting substrate.

A kind of led light source, comprise heat-conducting substrate, be packaged with at least two sections LED serial core sheets that connect with the series connection form on the described heat-conducting substrate, also be packaged with on the described heat-conducting substrate for the linear low density LED driving chip of adjusting LED serial core sheet luminance according to input voltage, described linear low density LED drives chip and is connected with LED serial core sheet;

Described LED serial core sheet is the LED serial core sheet be made up of with the series connection form some LED crystal grain or the LED serial core sheet that forms with the form of series connection and combination in parallel.

It is by at least two sections luminous drive integrated circults of LED string of input voltage control that described linear low density LED drives chip.

Further, also be welded with on the described heat-conducting substrate for the current-limiting resistance of adjusting LED serial core sheet operating current, described current-limiting resistance drives chip with described linear low density LED and is connected.

Further, also be packaged with rectifier bridge reactor core sheet on the described heat-conducting substrate, rectifier bridge reactor core sheet is connected with the commercial power interface that is arranged on the heat-conducting substrate, and described rectifier bridge reactor core sheet drives chip with linear low density LED and is connected.

Further, the base material of described heat-conducting substrate is aluminium, aluminium alloy, copper, copper alloy or pottery; The substrate surface of heat-conducting substrate immobilising device face is coated with one deck heat conductive insulating layer, and its thickness range is 1 to 1000 micron; Be distributed with on the described heat conductive insulating layer for the welding of device and the metallic film conductor that is electrically connected.

Further, described led light source directly uses civil power to drive.

The led light source that the utility model provides, by jointly being integrated in heat-conducting substrate on the luminous linear low density led driver of the described LED serial core sheet of control at least two sections LED serial core sheets, realized the fully integrated of led light source and driver, make led light source become the standalone module that direct use civil power drives, adopt LED illuminating product of the present utility model no longer to need Switching Power Supply or driver, reduce the volume of LED illuminating product, improved reliability, simplified production process greatly.Simultaneously because the heat-conducting substrate of led light source directly is fixed on the fin, the heat that each device on the heat-conducting substrate produces can directly be derived by fin, thereby reduced the operating temperature (higher operating temperature can reduce the service life of electronic device) of led light source, improved the while in service life of LED illuminating product and also further reduced production cost.

Description of drawings

Fig. 1 is the bulb structure schematic diagram that includes the utility model led light source;

Fig. 2 is the utility model led light source structural representation;

Fig. 3 is the utility model heat-conducting substrate cross section structure schematic diagram;

Fig. 4 is the utility model led light source electrical block diagram.

Description of reference numerals: 1-LED string, 2-heat-conducting substrate, 21-heat conductive insulating layer, 22-Copper Foil conductor, the 23-base material, 3-linear low density LED drives chip, the 4-driving element, 5-current-limiting resistance, 6-commercial power interface, 7-rectifier bridge heap, 8-lead, 9-lampshade, the 10-power interface, 11-fin, 12-thin wire, the 13-LED light source, 14-packaging area, 15-LED packaging plastic.

The specific embodiment

For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with the accompanying drawing in the utility model, technical scheme in the utility model is clearly and completely described, obviously, described embodiment is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.

Fig. 1 is the bulb structure schematic diagram that includes the utility model led light source, as shown in Figure 1, led light source 13 is built in the lampshade 9, be packaged with at least two sections LED serial core sheets 1 on the heat-conducting substrate 2 of led light source 13 and drive the linear low density led driver that chip 3, rectifier bridge reactor core sheet 7 and current-limiting resistance 5 are formed by linear low density LED, described LED serial core sheet 1 is the LED serial core sheet of being made up of with the series connection form some LED crystal grain or the LED serial core sheet of forming with the form of series connection and combination in parallel, and described LED serial core sheet is than high many of conducting voltage single led or LED crystal grain.As can be seen, led light source 13 directly is connected by lead 8 with power interface 10 from accompanying drawing 2, and the heat-conducting substrate 2 of led light source 13 directly is fixed on the fin 11 of bulb.

Fig. 2 is the utility model led light source structural representation, as shown in Figure 2, led light source 13 of the present utility model comprises heat-conducting substrate 2, be provided with a packaging area 14 (square frame shown in the dotted line is packaging area 14) at heat-conducting substrate 2, rectifier bridge reactor core sheet 7 is fixedly arranged in this packaging area 14, linear low density LED drives chip 3, at least two sections LED serial core sheets 1, by reference to the accompanying drawings 3 and accompanying drawing 2 shown in, packaging area 14 interior chips interconnect at last by thin wire 12 and cover the whole packaging area 14 of sealing with packaging plastic, and packaging area 14 outsides and inside have the metallic film conductor 22 of conducting to be connected the interior chip of packaging area and its outside components and parts.Heat-conducting substrate 2 is welded with commercial power interface 6 (or the pad for reserving), current-limiting resistance 5 outside this packaging area 14.Described commercial power interface 6 connects rectifier bridge reactor core sheet 7, and rectifier bridge reactor core sheet 7 connects linear high-voltage LED and drives chip 3, and linear low density LED drives chip 3 and connects LED serial core sheet 1, and current-limiting resistance 5 drives chip 3 with linear low density LED and is connected.

Described LED serial core sheet 1 interconnects the positive terminal of next section of negative pole termination LED serial core sheet 1 of LED serial core sheet 1 with the series connection form.

Described linear low density LED drives the luminance that chip 3 is used for adjusting according to input voltage LED serial core sheet 1, and it is a kind of drive integrated circult by at least two sections LED serial cores of Control of Voltage sheet that described linear low density LED drives chip 3.Linear low density LED drives the luminance that chip 3 can be adjusted each section LED serial core sheet according to the variation of input voltage.When voltage was elevated to the required voltage of first section LED serial core sheet conducting from zero volt, linear low density LED drives the conducting of first section LED serial core sheet of chip 3 controls, and then first section LED serial core sheet was luminous, other LED serial core sheets not conductings this moment; When voltage continues to be elevated to the required voltage of first section and second section LED serial core sheet conducting simultaneously, linear low density LED drives the conducting of second section LED serial core sheet of chip 3 controls, simultaneously linear high-voltage LED drives the current path that first section LED serial core sheet closed in chip 3 controls, because first section and second section LED connect, thus at this moment first section and second period LED serial core sheet while luminous; When voltage continues to be elevated to the required voltage of first section, second section and the 3rd section LED serial core sheet conducting simultaneously again, linear low density LED drives the current path that first section, second section LED string closed in the conducting of the 3rd section LED serial core sheet of chip 3 controls simultaneously, because first section, second section and the 3rd section LED connects, thus at this moment first section, second section and the 3rd period LED serial core sheet while luminous; If working method by that analogy when disposing more multistage LED serial core sheet.Process is just in time opposite when voltage descends.

The integrated circuit with all-wave or halfwave rectifier function that described rectifier bridge reactor core sheet 7 is formed for the commutation diode tube core; It is a kind of drive integrated circult by voltage-controlled at least two sections LED string that described linear low density LED drives chip 3, and linear low density LED drives the luminance that chip 3 can be adjusted each section LED lamp string according to the variation of input voltage.

In addition, the rectifier bridge reactor core sheet 7, linear low density LED driving chip 3, the LED serial core sheet 1 that are fixed on the heat-conducting substrate 2 with packaging technology can be encapsulated in the bigger zone (for example packaging area in the present embodiment 14) jointly, can according to circumstances be encapsulated in the zones of different of heat-conducting substrate 2, the utility model is not restricted this yet.Described current-limiting resistance 5 can be encapsulated in the packaging area 14 with other chip is integrated, also can be fixed on packaging area 14 heat-conducting substrate 2 outward with welding procedure, the utility model is not restricted this, but preferred current-limiting resistance 5 is fixed on outside the packaging area 14 with the form of welding, its objective is the operating current of being convenient to accurately adjust led light source 13.

The device that is fixed on the heat-conducting substrate with welding procedure described in the utility model all refers to Surface Mount Component,, described Surface Mount Component, refers to that profile is sheet, column type, cube or the abnormity of rectangle, and its weldering end or pin are produced in the same plane and are suitable for the electronic devices and components of surface texture technology.

It can only be circular configuration that led light source structural representation of the present utility model does not represent the utility model, as long as can realize utility model purpose of the present utility model all in protection domain of the present utility model, the utility model does not limit this.

Application of the present utility model is applied as example with the LED bulb and does not represent the utility model and can only be applied to the LED bulb, can also be applied to LED fluorescent tube, LED ceiling light, LED street lamp etc., and the utility model does not limit this.

The new described thin wire 12 of this practicality is generally spun gold, filamentary silver, copper wire or aluminium wire at the superfine lead that is used in the packaging technology being electrically connected between each unit.

Connection between the utility model device is by being distributed in being electrically connected that thin wires 12 constitute in metallic film conductor 22 on the heat-conducting substrate 2 or the packaging area 14.

Fig. 3 is the utility model heat-conducting substrate cross section structure schematic diagram; As shown in Figure 3, heat-conducting substrate 2 of the present utility model comprises: base material 23, heat conductive insulating layer 21, metallic film conductor 22, base material 23 places the bottom of heat-conducting substrate 2, is coated with heat conductive insulating layer 21 at base material 23, is distributed with metallic film conductor 22 at heat conductive insulating layer 21.Components and parts on the heat-conducting substrate 2 (current-limiting resistance 5, linear low density LED drive chip 3) are electrically connected by metallic film conductor 22 formations.

The line with certain width or zone that the described metallic film conductor 22 of this utility model is formed for the metallic film on the heat conductive insulating layer that is distributed in heat-conducting substrate, the welding that is used for components and parts is fixed and is electrically connected.Its material is generally copper, aluminium or silver.

Fig. 4 is the utility model led light source electrical block diagram, as shown in Figure 4, after commercial power interface 6 is piled 7 rectifications through rectifier bridge, the cathode output end of rectifier bridge heap 7 connects the positive terminal of LED serial core sheet, this LED serial core sheet is composed in series by 3 sections LED serial core sheets 1, every section LED serial core sheet 1 both positive and negative polarity all is connected to linear low density LED drive IC 3, and linear low density LED drive IC 3 is piled 7 cathode output end common grounds with rectifier bridge, and described linear low density LED drive IC 3 also is connected with current-limiting resistance 5.Described rectifier bridge heap 7 is the rectifier bridge D1 that is constituted by a diode; Described linear low density LED drive IC 3 is integrated circuit U1, and described current-limiting resistance 5 is made up of the resistance R 1, R2, the R3 that are connected with U1.

It should be noted that at last: above embodiment only in order to the technical solution of the utility model to be described, is not intended to limit; Although with reference to previous embodiment the utility model is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of each embodiment technical scheme of the utility model.

Claims

1. led light source, comprise heat-conducting substrate (2), be packaged with at least two sections LED serial core sheets (1) that connect with the series connection form on the described heat-conducting substrate (2), it is characterized in that, also be packaged with on the described heat-conducting substrate (2) for the linear low density LED driving chip (3) of adjusting LED serial core sheet (1) luminance according to input voltage, described linear low density LED drives chip (3) and is connected with LED serial core sheet (1);

Described LED serial core sheet (1) is the LED serial core sheet be made up of with the series connection form some LED crystal grain or the LED serial core sheet that forms with the form of series connection and combination in parallel;

It is by at least two sections luminous drive integrated circults of LED serial core sheet of input voltage control that described linear low density LED drives chip (3).

2. led light source according to claim 1, it is characterized in that, also be packaged with on the described heat-conducting substrate (2) for the current-limiting resistance (5) of adjusting LED serial core sheet (1) operating current, described current-limiting resistance (5) drives chip (3) with described linear low density LED and is connected.

3. led light source according to claim 1, it is characterized in that, also be packaged with rectifier bridge reactor core sheet (7) on the described heat-conducting substrate (2), rectifier bridge reactor core sheet (7) is connected with the commercial power interface (6) that is arranged on the heat-conducting substrate (2), and described rectifier bridge reactor core sheet (7) drives chip (3) with linear low density LED and is connected.

4. led light source according to claim 1 is characterized in that, the base material of described heat-conducting substrate (2) is aluminium, aluminium alloy, copper, copper alloy or pottery; The substrate surface of heat-conducting substrate (2) immobilising device face is coated with one deck heat conductive insulating layer (21), and its thickness range is 1 to 1000 micron; Be distributed with on the described heat conductive insulating layer (21) for the welding of device and the metallic film conductor (22) that is electrically connected.

5. led light source according to claim 1 is characterized in that, described led light source directly uses civil power to drive.