CN201273466Y

CN201273466Y - Constant-current LED

Info

Publication number: CN201273466Y
Application number: CNU2008200947406U
Authority: CN
Inventors: 杨松伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-05-18
Filing date: 2008-05-18
Publication date: 2009-07-15
Anticipated expiration: 2018-05-18

Abstract

The utility model discloses an LED with constant working current. Mainly, a constant-current device and an LED chip are connected in series and are used. The inhibitory characters of the constant-current device to current are utilized to limit working current which is provided for the LED chip, which enables the LED working current to be constant. If the provided working current exceeds the LED normal working current, big current may be restrained by the constant-current device, and the current is restrained to normal working conditions of the LED chip. The LED chip is prevented from damages and breakage due to excessive current, which plays a role of protecting the LED chip. The constant-current device and the LED chip are connected in series to be integrally assembled on an LED supporting frame and are combined into a whole through manufacture and capsulation. The design not only can solve the problems that the current on circuits is excessive, the use of LED needs external constant-current circuits or current limiting circuits, but also simplifies the manufacture and welding procedures of the external circuits, and soft damages to the LED chip due to high temperature and static electricity which are generated by an electric soldering iron when in welding are avoided. The technical demands of working staff are lowered simultaneously, and the product quality is improved.

Description

A kind of constant-current LED

Technical field:

The utility model relates to the LED technical field.The application of particularly constant current device being connected with led chip, and be integrated through epoxy encapsulation, a kind of constant-current LED formed.

Background technology:

At present, LED is the semiconductor devices of low-work voltage, low operating current, mainly comprises led support, led chip, plain conductor and epoxy resin, as Fig. 1.At present, the LED operating voltage range can not wait from 1.9～3.8 volts (Voltage), below the running current 25mA.In practical application area,, also there is the situation of some big current works except providing to LED the operating current that is not more than 25mA.For example: during product design, it is the current source of 50mA that an output services electric current is arranged.Existing LED running current is 20mA.Clearly, if directly this LED is inserted on the current source of 50mA, led chip can be because impressed current be excessive and breakdown, damage or seriously shorten LED service life.Under this condition, in order to guarantee LED energy operate as normal, the way of employing is to be provided with constant-current circuit or current-limiting circuit in circuit, meets the requirement of LED operate as normal with the electric current that guarantees current source output, inserts LED then, could operate as normal.

Though adopt peripheral hardware constant-current circuit or current-limiting circuit, can guarantee that LED uses under big current condition can operate as normal, not breakdown damage.But this method still exists flaw and deficiency, if when producing, solder technology control is improper, large-scale waste product will occur, has strengthened the failure cost unintentionally.The flaw and the deficiency of the method for peripheral hardware constant-current circuit or current-limiting circuit mainly show as: 1, the welding requirements staff possesses higher welding technical ability; 2, when welding, can't guarantee that high temperature and static that electric iron produces do not cause the damage of led chip software; 3, adopt solder technology, environment is caused to a certain degree pollution;

Summary of the invention:

At the problems referred to above, the utility model is to provide a kind of constant-current LED.This constant-current LED, integrated constant current device and led chip are connected in series.Wherein constant current device and led chip are that disposable encapsulation is integrated through epoxy resin.The problem of peripheral hardware constant current or current-limiting circuit and welding when having simplified the LED use greatly, high temperature that has been produced when having avoided welding and static have guaranteed LED service life to the software damage that led chip causes.Simultaneously, reduced the requirement of staff's technical ability.

The technical scheme that the utility model adopted:

A kind of constant-current LED (light emitting diode) comprises led support, constant current device, led chip, plain conductor and epoxy resin.Described constant-current LED is, at first constant current device is fixed on the platform of led support, secondly led chip is fixed on another platform of led support, the 3rd, with plain conductor (4) negative electrode of constant current device and the P region electrode of led chip are connected in series, perhaps use plain conductor (4) that the positive electrode of constant current device (2) is connected with the N region electrode of led chip (3).The 4th, led support, constant current device, led chip, plain conductor are integrated through epoxy encapsulation.

The effect that the utility model is useful is:

The utility model provides a kind of constant current device and led chip has been connected in series, encapsulate the integrated constant-current LED that is integrated (light emitting diode), this constant-current LED not only can guarantee that led chip can not punctured under big current work state, damages or reduction of service life.Simultaneously, constant current device and led chip are integrated to be integrated, and has reduced operating personnel's welding technical ability requirement; Simplified the operation of the design and the welding of constant-current circuit or current-limiting circuit.Greatly reduce the failure cost.Promote normal service life of LED thus, guaranteed product quality.

Description of drawings:

Below in conjunction with accompanying drawing the utility model is further specified:

Fig. 1 is existing traditional LED structural representation;

Fig. 2 is the utility model constant-current LED structural representation;

Fig. 3 is the utility model constant-current LED circuit theory diagrams;

The specific embodiment:

With reference to Fig. 1, be existing traditional LED structural representation.This tradition LED running current is no more than 25mA.

With reference to Fig. 2, this reality is opened novel constant-current LED (light emitting diode), comprises led support 1, constant current device 2, LED wafer 3, plain conductor 4 and epoxy resin 5.Described a kind of constant-current LED (light emitting diode) is that constant current device 2 is fixed on the platform of led support 1, LED wafer 3 is fixed on another platform of led support 1, adopt plain conductor 4 that the negative electrode of constant current device 2 is connected with the N region electrode of LED wafer 3, again with epoxy resin 5 encapsulation.

With reference to Fig. 3, the utility model constant-current LED circuit theory diagrams, excessive when the operating current that provides to constant-current LED, this big electric current is when flowing through constant current device 2, and big electric current will be suppressed by constant current device 2, is reduced to the condition of work that meets led chip 3.The flow through electric current I of constant current device 2 _ZEqual the operating current I of led chip _F, that is: I _Z=I _FWork as electric current I _ZWhen the positive pole of constant current device 2 flowed to negative pole, the both positive and negative polarity of constant current device just produced a voltage U _Z, this voltage can be used as the operating voltage of constant current device, I _Z(be I _F) when the P region electrode of led chip 3 flowed to the N region electrode, led chip 3 was because forward conducting of electric current, produced a voltage (U forward at P, the N region electrode of led chip _LED), the operating voltage=U of this constant-current LED _LED+ U _Z

This constant-current LED (light emitting diode) is integrated constant current device has guaranteed that effectively whole LED can operate as normal under the big current condition.Not only having simplified traditional LED needs to design the working-procedure problem of constant-current circuit or current-limiting circuit and welding under big current work condition, and reduced operating personnel's welding technical ability requirement, electric iron is produced when having avoided LED not soldered simultaneously high temperature and static cause the software damage, promote LED quality and operate as normal life-span, greatly reduced product failure cost.

More than for example only with conveniently explanation the present invention, at the spiritual category that is not breaking away from the present invention's creation, various simple and easy covert and modification that person skilled in the art scholar did still belong to technical scheme of the present invention.

Claims

1, a kind of constant-current LED comprises led support (1), constant current device (2), led chip (3), plain conductor (4) and epoxy resin (5) is characterized in that led support (1), constant current device (2), led chip (3), plain conductor (4), encapsulate through epoxy resin (5), are integrated.

2, a kind of constant-current LED according to claim 1 is characterized in that constant current device (2) is connected by plain conductor (4) with led chip (3).

3, a kind of constant-current LED according to claim 1 is characterized in that constant current device (2) is fixed on the platform of led support (1), and led chip (3) is fixed on another platform of led support (1).

4, a kind of constant-current LED according to claim 1, the negative electrode that it is characterized in that constant current device (2) is connected by plain conductor (4) with the P region electrode of led chip (3) or the positive electrode of constant current device (2) is connected by plain conductor (4) with the N region electrode of led chip (3).

5, constant-current LED according to claim 1, constant current components and parts (2) can be current regulator diodes, also can be other constant current integrated circuits.