CN1589078A - Luminous diode light source - Google Patents
Luminous diode light source Download PDFInfo
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- CN1589078A CN1589078A CN 200410060694 CN200410060694A CN1589078A CN 1589078 A CN1589078 A CN 1589078A CN 200410060694 CN200410060694 CN 200410060694 CN 200410060694 A CN200410060694 A CN 200410060694A CN 1589078 A CN1589078 A CN 1589078A
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Abstract
This invention relates to a LED light source including a power supply, a transformer, a LED lattice, the power supply provides power to the lattice by the transformer having a switch circuit between them controlled by an oscillation circuit. The oscillation circuit and the switch circuit are set in this inverted light source circuit, the oscillation circuit generates square wave signals in a certain frequency to control the on-off of the switch circuit to control the current input into the LED and make LED lattice flash in high frequency to increase its transient brightness.
Description
Technical field
The present invention relates to be used to light source, particularly light-emitting diode (LED) light source that throws light on and indicate.
Background technology
Current society, energy problem has become outstanding problem.Illumination is the importance of human consumes energy, shows according to the media report data, uses semiconductor light sources LED to replace traditional incandescent lighting, will save 50% of whole world illumination energy consumption.Hence one can see that, and at the electronic technology field in future, led light source will become another big electronics theme as indication and illumination.
LED is a kind of solid light source, and from the nineties, the appearance of GaAlInP and GaAlInN light-emitting diode makes the luminous efficiency of LED and luminous intensity that breakthrough development arranged, and high brightness white and blue led occur.Enter 21 century, development along with material technology, encapsulation technology and self technology, the luminous flux of single LED only can reach tens lumens, red, orange LED optical efficiency can reach 100lm/W, green LED also can reach 50lm/W, light intensity has surpassed 1cd (people are with the separation of 1cd as general LED and high-brightness LED usually), and also there has been raising at its visual angle, has surpassed 60 degree.For its application in various illuminations and indication mechanism is laid a good foundation.
At present, led light source has been applied to various industrial circles, and along with the continuous development of LED self-technique and increasingly mature, led light source will replace traditional incandescent light source.In addition, LED is a kind of low field pattern electroluminescent device, and it has that voltage is low, electric current is little, brightness is high, the life-span is long, volume is little, energy consumption is low and characteristics such as response speed is fast, and these characteristics make more excellent indication and the illuminator lamp of development performance become possibility.
Existing led light source is all formed (as shown in Figure 2) by power supply, transformer, LED dot matrix, and power supply provides power supply by transformer for LED array.Existing led light source has only by improving the input voltage of LED, and the brightness that improves led light source can cause energy consumption raising, LED life-span to reduce like this.
Summary of the invention
Technical problem to be solved by this invention is: a kind of light-emitting diode (LED) light source is provided, and its luminosity height, energy consumption is low, the life-span is long.
The present invention solves the problems of the technologies described above the technical scheme that is adopted:
A kind of LED source, it comprises power supply, transformer, LED array, power supply provides power supply by transformer for LED array; Be provided with switching circuit between power supply and the LED array, switching circuit is controlled by an oscillating circuit.
In addition, the output frequency of oscillating circuit is: 90-120Hz.
In addition, it also comprises modulation circuit, and oscillating circuit has identical clock with modulation circuit, and switching circuit is also controlled by modulation circuit.
In addition, the baud rate of modulation circuit is more than 1.2k.
In addition, be provided with load switching circuit between power supply and the late-class circuit.
Be provided with oscillating circuit and switching circuit in the circuit of light sources of the present invention, oscillating circuit produces the square-wave signal of certain frequency, opening and closing with the control switch circuit, electric current with control input LED, make LED dot matrix high frequency flicker, improve the instantaneous brightness of LED, make light source under the situation of the brightness raising of led light source, the life-span that can not improve power consumption, LED can not be affected yet.
For preventing that light source scintillation from causing people's kopiopia, the output frequency of oscillating circuit generally is made as 90-120Hz.
The present invention utilizes short characteristic of LED response time, a modulation circuit is set in circuit of light sources, the signal that modulation circuit will send is modulated into square wave output, the square wave height electricity opening and closing of control switch circuit frequently of output, electric current with control input LED dot matrix, make LED dot matrix high frequency flicker, make led light source have the function that information is transmitted.
The baud rate of modulation circuit is more than 1.2k, to guarantee signal transmitting speed and stable.
Also be provided with load switching circuit in the circuit of light sources of the present invention, its purpose is to prevent the power supply reversal connection that inserts and cause the electronic component in the circuit to damage, with the protection entire circuit.
Led light source of the present invention can be used for illumination and indication light source, the navigation light etc. of automobile.
Description of drawings
Fig. 1 is led light source embodiment 1 circuit block diagram of the present invention
Fig. 2 is the circuit block diagram of existing led light source
Fig. 3 is led light source embodiment 1 circuit diagram of the present invention
Fig. 4 is the LED original waveform of existing led light source output waveform and led light source embodiment of the present invention 1 output, the high frequency waveforms of oscillating circuit output, the output waveform comparison diagram of light source reality
Fig. 5 is led light source embodiment 2 circuit block diagrams of the present invention
Fig. 6 is led light source embodiment 2 circuit diagrams of the present invention
Fig. 7 is the high frequency waveforms of the oscillating circuit output of led light source embodiment 2 of the present invention, the high frequency waveforms of modulation circuit output, the output waveform comparison diagram of light source reality
Fig. 8 is the circuit block diagram of information receiver
Fig. 9 is the voltage waveform of led light source embodiment 2 input LED dot matrix of the present invention
Figure 10 is the light signal output waveform that is used to receive the optical sensor of the light that led light source embodiment 2 of the present invention sends
Embodiment
Led light source embodiment 1 of the present invention as shown in Figure 1, it is the illumination and the indication LED light source of automobile, and it comprises power supply, transformer, LED array, and power supply provides power supply by transformer for LED array; Be provided with switching circuit between power supply and the LED array, switching circuit is controlled by an oscillating circuit.The output frequency of oscillating circuit is: 90-120Hz.Be provided with load switching circuit between power supply and the late-class circuit.
Led light source embodiment 1 circuit diagram of the present invention as shown in Figure 3, wherein:
Load switching circuit is the load switching circuit (switch) by the power MOSFET design, its operation principle is: have only when Vin and Vcon simultaneously for positive the time, load switch just is opened and work such as the oscillating circuit of level and transformer after making, and can avoid causing because of the reversal connection of power supply the infringement of late-class circuit so well.
Because the supply voltage that automobile uses is low, the LED limited amount of drives in order to increase the quantity of LED in the LED dot matrix, can select a voltage lifting circuit as transformer usually.In the design field of LED chip for driving, the LT series of Linear Tech drives the max series driver of product and MAXIM company and walks in the prostatitis of technology, its product all has the input voltage range of broad, voltage output adjustability is good, encapsulate little, characteristics such as good temp characteristic can be good at solving the low excessively problem of supply voltage used when design circuit.Led light source embodiment 2 of the present invention considers from the driving aspect of automobile-used light source, chooses LT1618 conduct (boosting) transformer in the LT series of products, also has switching circuit in the LT1618 simultaneously.
Oscillating circuit is NE555, its purpose is the square-wave signal that produces certain frequency, with the shutoff of the switching circuit of control in the LT1618 or provide pulsewidth and the electric current of LED is crossed in pulse frequency modulation with control flows, the purpose of LT1618 is to promote power source voltage and increase load (LED) and constant electric current is provided, and improves the instantaneous brightness of LED.This design can be good at protecting the constant type of electric current in the positive output circuit, increase that also can be as much as possible with load to satisfy the practical application of LED.
The typical multi-resonant oscillating circuit of NE555, its effect provide the pulse of certain frequency and control the interior switching circuit work of LT1618, and output voltage is by R
3And R
4Decision, its relational expression is:
R
3＝R
4(V
out/1.263-1)
Output current Io (flowing through the electric current of LED) is by R
6Decision after having determined to flow through the electric current of LED, just can be adjusted R easily
6Resistance finish.Its relational expression is:
Io＝50mv/R
6
This circuit has stable output current in actual measurement, the fluctuation of input voltage does not influence output current and voltage substantially, and its actual measured value is as shown in the table, the numerical value in the table be according to the design output voltage be 36V, output current is that 70mA draws.
| Input voltage (V) | Output voltage (V) | Output current (mA) |
| ????10 | ????35.1 | ????63 |
| ????11 | ????35.6 | ????67 |
| ????12 | ????36.2 | ????71 |
| ????13 | ????36.5 | ????75 |
If find LED the phenomenon of flicker is arranged, main cause is exactly that the design frequency of oscillating circuit is too low, and its output frequency is changed into 90-120Hz, and scintillation disappears thereupon.
The encapsulation of used LED is SMD in the present embodiment 1, and 2.1 volts of its nominal voltages, the maximum current that can pass through are 175mA, and its brightness (redness) can reach 1125-2850mcd, and the visual angle can reach 120 degree, and luminous flux can reach 5lm.
In the LED dot matrix, the serial connection of LED make in use can cause whole light source because of the damage of a LED wherein can not be luminous, in order effectively to avoid the generation of this problem, two ends at every LED, (cut-in voltage of general-purpose diode is a benefit less than the nominal voltage of LED to a last general-purpose diode in parallel, common silicone tube and germanium tube just can reach requirement), can well avoid the generation of this problem.
In addition, because automobile-used light source requirements brightness height, therefore the quantity of required LED is many, and it is particularly outstanding that its heat dissipation problem just becomes.In the hard making sheet circuit of design,, prevent concentrating of heat for effective heat radiation, can be two up and down with hard making sheet circuit design, lower floor is exclusively used in modulation circuit and transformer, and the upper strata is a LED dot matrix circuit, can avoid because the heat transferred of LED makes its damage to chip for driving.
As shown in Figure 4, waveform 1 is the LED original waveform among the figure, promptly has the output waveform of led light source now, and it is a straight line.Waveform 2 is oscillating circuit output high frequency waveforms, and it is a square wave.Waveform 3 is the output waveform of light source reality, the output waveform of light source embodiment 1 light source reality promptly of the present invention, and it is a square wave.
Led light source embodiment 2 of the present invention as shown in Figure 5, it is automotive lighting and the indication LED light source with information transfer function, it comprises power supply and LED array, also is provided with load switching circuit, switching circuit, transformer between power supply and LED array successively.Also be provided with a modulation circuit and an oscillating circuit in the circuit, oscillating circuit has identical clock with modulation circuit, and switching circuit is controlled jointly by modulation circuit and oscillating circuit.The baud rate of modulation circuit is more than 1.2k.
Led light source embodiment 2 circuit diagrams of the present invention as shown in Figure 6: wherein: load switching circuit is the load switching circuit (switch) by the power MOSFET design, and LT1618 also has switching circuit in the LT1618 simultaneously as (boosting) transformer.
Modulation circuit is single-chip microcomputer (P89C51X2BN), the P1.1-P1.7 corner connection of single-chip microcomputer is collected mail number, Enable Pin from the pulse signal of serial ports output certain frequency to LT1618 after modulating, its effect are to control switching circuit work in the LT1618 by the pulse signal that sends.
In addition, single-chip microcomputer itself can also be as oscillating circuit, single-chip microcomputer can be set the pulse signal of output certain frequency, pulse signal after modulation and this pulse signal (two signals have identical clock) stack back output, switching circuit work in the control LT1618, be beneficial to cut down the consumption of energy, improve the useful life of LED.If find LED the phenomenon of flicker is arranged, it is too low to illustrate that single-chip microcomputer can be set the frequency of output, and its output frequency is made as 90-120Hz, and scintillation can disappear.
As shown in Figure 7, waveform 2 is the oscillating circuit output high frequency waveforms of light source embodiment 2 light sources of the present invention among the figure, and it is a square wave.Waveform 4 is the modulation circuit output high frequency waveforms of light source embodiment 2 light sources of the present invention, and it is a square wave.Waveform 3 is the output waveform of light source reality, the output waveform of light source embodiment 2 light source reality promptly of the present invention, and it is a square wave.
Information receiver as shown in Figure 8, it comprises optical sensor, amplifier, serial line interface, single-chip microcomputer, have light signal information, that led light source sends by the higher optical sensor of sensitivity, light signal is converted to the signal of telecommunication, and signal amplified send into single-chip microcomputer by serial ports, point out or show again by other external equipment of Single-chip Controlling, or by other external equipment.
Single-chip microcomputer stack output two signals have identical clock, make information carrying signal to send computer accurately to, simultaneously, in order not influence the transmission of light, the higher-order of oscillation be in idle in, its output remains high level.
Voltage waveform such as Fig. 9 of input LED dot matrix are through light signal output waveform such as Figure 10 of optical sensor.
Among the led light source embodiment 2 of the present invention, the signal of transmission can be accepted accurately by computer, it is vital selecting a kind of rational communication modes.If in the LED light signal, add the pulse signal of high frequency, sort signal can just satisfy the character format of serial asynchronous communication, format conversion with this serial communication becomes the mode of parallel communication to be transferred to computer again, finishes Signal Processing by computer then.Assigned by computer then and instruct in external equipment, prompting the driver operate accordingly.
The character format of serial communication is mainly formed start bit (1 low level), data bit (7), parity check bit (1) and position of rest (1 high level) by four parts.Therefore will export light signal and encode, and make it have certain implication, so that computer can be discerned sort signal according to this form.Therefore, on the basis of original square-wave signal, add the square-wave signal that meets the serial communication form of higher frequency, just can finish the transmission of LED signal.Because the high frequency characteristics of added transmission information signal is little to people's visual angle influence.
From input and output waveform branch, the output light signal is a square-wave signal, and this just makes the instantaneous brightness that has improved LED under the identical situation of energy consumption.The carrier signal of this output has been transmitted the character signal identical with the serial line interface communication, can be accepted by computer and handles by serial ports.
Under the strong situation of the brightness of the original car light of brightness ratio of led light source embodiment 2 signal lamps of the present invention, the transient current that flows through LED is 70mA, the voltage that is added in the LED two ends is 36V, can calculate the power P=UI=2.52W of light sources consume thus, compare with incandescent lamp 25W commonly used, obviously significantly reduced energy consumption.Because light signal is the square-wave signal of implication information, when design, take into full account the frequency of carrier signal, could not only can effectively avoid scintillation but also can transmit information accurately.
The application of led light source embodiment 2 of the present invention in automotive luminaire makes automotive luminaire have more intellectuality.In the middle of vehicle intellectualized light source design, different information signals is encoded and stipulate, make different coded messages represent light source of different nature.For example be 1000011 the direction indicator lamp of being appointed as with the data bit in the serial communication character, and with 1000111 be appointed as stop lamp etc.All automobile-used light sources are carried out unique encoding, just can in intelligentized automobile, use, utilize the intention of multimedia mode prompting driver the other side vehicles such as figure and sound.In the process of reversing automobile, utilize this intelligent light source, effectively minimizing accident replaces special-purpose radar backing system.The light signal that the reversing lamp of automobile sends radiates when running into barrier, is received by optical sensor and sends into the spacing of Computer Processing with prompting driver safety then.
Along with the raising of vehicle energy saving requirement and intelligent requirements, led light source embodiment 2 of the present invention will become the main product in the automotive luminaire.
Claims (5)
1, a kind of LED source, it comprises power supply, transformer, LED array, power supply provides power supply by transformer for LED array, it is characterized in that: be provided with switching circuit between power supply and the LED array, switching circuit is controlled by an oscillating circuit.
2, light source as claimed in claim 1 is characterized in that: the output frequency of oscillating circuit is: 90-120Hz.
3, light source as claimed in claim 1 or 2 is characterized in that: it also comprises modulation circuit, and oscillating circuit has identical clock with modulation circuit, and switching circuit is also controlled by modulation circuit.
4, light source as claimed in claim 3 is characterized in that: the baud rate of modulation circuit is more than 1.2k.
5, light source as claimed in claim 1 or 2 is characterized in that: be provided with load switching circuit between power supply and the late-class circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410060694 CN1589078A (en) | 2004-08-09 | 2004-08-09 | Luminous diode light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410060694 CN1589078A (en) | 2004-08-09 | 2004-08-09 | Luminous diode light source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1589078A true CN1589078A (en) | 2005-03-02 |
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ID=34603539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410060694 Pending CN1589078A (en) | 2004-08-09 | 2004-08-09 | Luminous diode light source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1589078A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007124666A1 (en) * | 2006-04-28 | 2007-11-08 | Hong Kong Applied Science and Technology Research Institute Co. Ltd | Efficient lighting |
| US7586271B2 (en) | 2006-04-28 | 2009-09-08 | Hong Kong Applied Science and Technology Research Institute Co. Ltd | Efficient lighting |
| CN101657057B (en) * | 2009-08-21 | 2013-06-05 | 深圳市金流明光电技术有限公司 | LED power circuit |
-
2004
- 2004-08-09 CN CN 200410060694 patent/CN1589078A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007124666A1 (en) * | 2006-04-28 | 2007-11-08 | Hong Kong Applied Science and Technology Research Institute Co. Ltd | Efficient lighting |
| US7294978B1 (en) | 2006-04-28 | 2007-11-13 | Hong Kong Applied Science And Technology Research Institute Co. Ltd. | Efficient lighting |
| US7586271B2 (en) | 2006-04-28 | 2009-09-08 | Hong Kong Applied Science and Technology Research Institute Co. Ltd | Efficient lighting |
| CN101657057B (en) * | 2009-08-21 | 2013-06-05 | 深圳市金流明光电技术有限公司 | LED power circuit |
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