CN105472818B - A kind of LED illumination circuit - Google Patents
A kind of LED illumination circuit Download PDFInfo
- Publication number
- CN105472818B CN105472818B CN201610021008.5A CN201610021008A CN105472818B CN 105472818 B CN105472818 B CN 105472818B CN 201610021008 A CN201610021008 A CN 201610021008A CN 105472818 B CN105472818 B CN 105472818B
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- Prior art keywords
- diode
- lamp bead
- constant current
- circuit
- led
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- 238000005286 illumination Methods 0.000 title claims abstract description 13
- 239000011324 bead Substances 0.000 claims abstract description 49
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052802 copper Inorganic materials 0.000 claims abstract description 9
- 239000010949 copper Substances 0.000 claims abstract description 9
- 238000005070 sampling Methods 0.000 claims description 9
- 230000003139 buffering effect Effects 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 4
- 238000005538 encapsulation Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
-
- 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]
-
- 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
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
The invention provides a kind of LED illumination circuit, including rectifier circuit, LED lamp bead group and linear constant current IC；The rectifier circuit, for DC voltage will to be converted into after the ac voltage rectifier of AC power；The linear constant current IC, for the DC voltage from the rectifier circuit to be converted into the DC current of constant size；The LED lamp bead group is provided with several lamp bead strings being mutually in series, and each lamp bead string is provided with several LED lamp beads being mutually in parallel.The present invention is compact-sized, omitting external constant current driving, reduces cost, and constant current accuracy is high.Lamp bead string and mixing combination can realize that one LEDs lamp bead of damage does not influence the effect of remaining LED normal work, so that the probability that light fixture influences to use substantially reduces.Allow the copper sheet on the both threads road to power in wiring board to reach maximum width simultaneously, so that this product can concatenate multiple, save wiring the end of a thread quantity in engineering construction, reduction construction cost.
Description
Technical field
The present invention relates to a kind of circuit, more particularly to a kind of LED illumination circuit.
Background technology
Light emitting diode is a kind of semiconductor electronic component that can be luminous.LED have efficiency high, long lifespan, not cracky,
The advantages of not available for the conventional light sources such as switching speed height, high reliability, therefore LED is widely used in respectively as lighting source
Individual field.
Because the LED characteristics of luminescence is generally all expressed as the function of electric current, rather than the function of voltage, therefore, using perseverance
Stream source drives the brightness that can better control over LED.In addition LED forward voltage drop excursion is larger, forward voltage it is small
Change can cause larger forward current to change, so as to cause the large change of brightness.So it can not be protected using drive of constant voltage source
The uniformity of LED luminance is demonstrate,proved, and influences LED reliability, life-span and light decay.Therefore, high-brightness LED generally use constant-current source
Driving.
LED drive circuit in the market, the damage of single lamp bead easily cause the operation of whole circuit not smooth, simultaneously
The unreasonable of component setting causes the increase of project installation difficulty.
The content of the invention
The invention aims to solve technical problem involved in background technology, there is provided a kind of LED illumination electricity
Road.
The technical scheme is that：
A kind of LED illumination circuit, including rectifier circuit, LED lamp bead group and linear constant current IC；
The rectifier circuit, for DC voltage will to be converted into after the ac voltage rectifier of AC power；
The linear constant current IC, for the DC voltage from the rectifier circuit to be converted into the direct current of constant size
Electric current；
The LED lamp bead group is provided with several lamp bead strings being mutually in series, and each lamp bead string is mutually in parallel provided with several
LED lamp bead.
Preferably, it is described to sample feedback resistance and buffering electric capacity, the LED lamp bead group, sampling feedback resistance and linear perseverance
Flow IC to be sequentially connected in series, the buffering electric capacity is provided with 2, and one of them is connected in parallel on LED lamp bead group, sampling feedback resistance and linear perseverance
Outside the sequential circuit for flowing IC, another is connected in parallel on outside linear constant current IC.
Preferably, the rectifier circuit is provided with diode D1, D2, D3 and D4, the negative pole of the diode D1 and two poles
Pipe D2 negative pole concatenates the pole as power supply circuit, and the positive pole of the diode D3 and diode D4 positive pole concatenation are as confession
Another pole of circuit, the one end of the positive pole of the diode D1 and diode D3 negative pole concatenation as AC power input,
The other end of the positive pole of the diode D2 and diode D4 negative pole concatenation as AC power input.
Preferably, the linear constant current IC is that SO-8 is encapsulated or TO252-2 is encapsulated or SOT89-3 encapsulation.
Preferably, the linear constant current IC uses CYT1000A chips or CYT1000AE chips or SM2082 chips.
Preferably, on circuit boards, the diode D1 and diode D2 are positioned at electricity for the LED illumination circuit whole installation
One end of road plate, the diode D3 and diode D4 are located at the other end of circuit board, the positive pole of the diode D1 and two poles
Pipe D3 negative pole is connected by copper sheet, and the positive pole of the diode D2 is connected with diode D4 negative pole by copper sheet.
Preferably, described diode D1, D2, D3 and D4 are IN4007 type diodes.
In summary, the invention has the advantages that：
The present invention is compact-sized, omitting external constant current driving, reduces cost, and constant current accuracy is high.Lamp bead string and mixing group
Closing can realize that one LEDs lamp bead of damage does not influence the effect of remaining LED normal work, so that light fixture influences what is used
Probability substantially reduces, and increases the service life so as to reach, and reduces the effect of maintenance times and cost.Obtain and powered in wiring board simultaneously
The copper sheet on both threads road can reach maximum width so that this product can concatenate multiple, saved engineering and applied
The end of a thread quantity is connected up in work, reduces construction cost.
Brief description of the drawings
Fig. 1 is the present embodiment circuit theory diagrams；
Fig. 2 is the SO-8 encapsulating structure figures of the CYT1000A chips of the present embodiment；
Fig. 3 is the TO252-2 encapsulating structure figures of the present embodiment；
Fig. 4 is the SOT89-3 encapsulating structure figures of the present embodiment.
Embodiment
As Figure 1-4, a kind of LED illumination circuit, including rectifier circuit, LED lamp bead group and linear constant current IC；
The rectifier circuit, for DC voltage will to be converted into after the ac voltage rectifier of AC power；
The linear constant current IC, for the DC voltage from the rectifier circuit to be converted into the direct current of constant size
Electric current；
The LED lamp bead group is provided with several lamp bead strings being mutually in series, and each lamp bead string is mutually in parallel provided with several
LED lamp bead.
LED bead string and mixing combination can realize that one LEDs lamp bead of damage does not influence the effect of remaining LED normal work
Fruit, only can just light fixture be set to lose luminous function when three LEDs of fixed bit continuous adjacent all damage, so that
The probability that light fixture influences to use substantially reduces, and increases the service life so as to reach, and reduces the effect of maintenance times and cost.It is described
Lamp bead quantity in LED strip and mixing circuit can adjust according to actual conditions such as lamp bead rated voltage differences, it is also possible to resistance
Or other elements realize the increase and decrease of lamp bead quantity instead of the lamp bead of institute's vacancy.
Feedback resistance and buffering electric capacity are sampled, the LED lamp bead group, sampling feedback resistance and linear constant current IC go here and there successively
Connect, the buffering electric capacity is provided with 2, and one of them is connected in parallel on the concatenation of LED lamp bead group, sampling feedback resistance and linear constant current IC
Outside circuit, another is connected in parallel on outside linear constant current IC.
The rectifier circuit is provided with diode D1, D2, D3 and D4, the negative pole of the diode D1 and bearing for diode D2
Pole concatenates the pole as power supply circuit, and the positive pole of the diode D3 and diode D4 positive pole are concatenated as power supply circuit
Another pole, the one end of the positive pole of the diode D1 and diode D3 negative pole concatenation as AC power input, two pole
The other end of pipe D2 positive pole and diode D4 negative pole concatenation as AC power input.
The linear constant current IC is that SO-8 is encapsulated or TO252-2 is encapsulated or SOT89-3 encapsulation.The linear constant current IC is used
CYT1000A chips or CYT1000AE chips or SM2082 chips.
TO252-2 wrappers are containing OUT terminal, GND ends, current sampling feedback end (REXT).The chip utilizes current sampling
It is 5mA-60mA to hold outer meeting resistance to set electric current, and output current does not change with chip OUT terminal mouth voltage.This IC is internally integrated
Temperature compensation function, output current will be reduced automatically when chip internal junction temperature is more than 100 DEG C to reduce lamp interior temperature,
So as to extend LED lamp bead service life.
On circuit boards, the diode D1 and diode D2 are located at circuit board to the LED illumination circuit whole installation
One end, the diode D3 and diode D4 are located at the other end of circuit board, the positive pole of the diode D1 and diode D3's
Negative pole is connected by copper sheet, and the positive pole of the diode D2 is connected with diode D4 negative pole by copper sheet.Two pole
Pipe D1, D2, D3 and D4 are IN4007 type diodes.
This structure allows the copper sheet on the both threads road to power in wiring board to reach maximum width, so that
This product can concatenate as many as 25-62, saved wiring the end of a thread quantity in engineering construction, reduced construction cost.
It is cleverly compatible to make in the circuit design of the present embodiment in addition to civil power (220V) can be used to power
The circuit structure powered with low pressure (AC/DC24V).The present embodiment is 6 LEDs tandems, for 6 strings 3 simultaneously.Supplied in production high pressure
The special lamp bead that lamp bead used is single 36V voltages during electric product, power is 0.3W-1W, coordinate integrated linear constant current IC and
Complete function can be achieved in commutation diode.If be produced into the product of low pressure (AC/DC24V) power supply, used lamp bead is
Single 2.0V-3.8V voltages, the lamp bead that power is 0.05W-1W, will be permanent without using high-voltage linear in the product of this low-voltage power supply
IC is flowed, it is skipped IC parts using 0R equivalent resistance wire jumpers on circuit board structure, now also needs the resistance that will be concatenated in lamp bead
Appropriate regulation with share in a loop namely six LEDs unaffordable unnecessary supply voltage, i.e. 24V-6*3.2V
=4.8V, i.e. about 4.8V or so voltage will be shared by institute's string resistance among circuit, and its resistance can be calculated by Ohm's law.
Described above is only explanation of the invention so that those of ordinary skill in the art's can completely implements we
Case, but be not limitation of the present invention, those skilled in the art can be as needed to this reality after this specification is read
The modification that example makes no creative contribution is applied, these are all without creative modification.But as long as in the right of the present invention
All protected in claimed range by Patent Law.
Claims (1)
- A kind of 1. LED illumination circuit, it is characterised in that：Including rectifier circuit, LED lamp bead group, linear constant current IC, sampling feedback Resistance and buffering electric capacity；The rectifier circuit, for DC voltage will to be converted into after the ac voltage rectifier of AC power；The linear constant current IC, for the DC voltage from the rectifier circuit to be converted into the direct current of constant size Stream；The LED lamp bead group is provided with several lamp bead strings being mutually in series, and each lamp bead string is provided with several LED being mutually in parallel Lamp bead；The LED lamp bead group, sampling feedback resistance and linear constant current IC are sequentially connected in series, and the buffering electric capacity is provided with 2, wherein one Individual to be connected in parallel on outside the sequential circuit of LED lamp bead group, sampling feedback resistance and linear constant current IC, another is connected in parallel on linear constant current IC Outside；The rectifier circuit is provided with diode D1, D2, D3 and D4, the negative pole of the diode D1 and diode D2 negative pole string The pole as power supply circuit is connect, the positive pole of the diode D3 and diode D4 positive pole are concatenated as the another of power supply circuit Pole, the one end of the positive pole of the diode D1 and diode D3 negative pole concatenation as AC power input, the diode D2 Positive pole and diode D4 negative pole concatenation as AC power input the other end；The linear constant current IC is that SO-8 is encapsulated or TO252-2 is encapsulated or SOT89-3 encapsulation；The linear constant current IC uses CYT1000A chips or CYT1000AE chips or SM2082 chips；On circuit boards, the diode D1 and diode D2 are located at one end of circuit board to the LED illumination circuit whole installation, The diode D3 and diode D4 are located at the other end of circuit board, and the positive pole of the diode D1 and diode D3 negative pole lead to Cross copper sheet to be connected, the positive pole of the diode D2 is connected with diode D4 negative pole by copper sheet；Described diode D1, D2, D3 and D4 are rectification type diode,Wherein, the circuit board includes 0R equivalent resistances bridle wire apparatus and adjustable resistance, the adjustable resistance and the LED lamp bead Group concatenation；The LED lamp bead group is provided with 6 lamp bead strings being mutually in series, and each lamp bead string is provided with 3 LEDs being mutually in parallel Pearl；When the LED illumination circuit uses 220V power voltage supplies, the rated voltage of each LED lamp bead is 36V and power is 0.3-1W；AndWhen the LED illumination circuit uses 24V power voltage supplies, the rated voltage of each LED lamp bead is 2.0-3.8V and work( Rate is 0.05-1W, and the 0R equivalent resistances bridle wire apparatus skips the linear constant current IC and makes the circuit board without using described Linear constant current IC, and the adjustable resistance is adjusted to share supply voltage unnecessary in a loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610021008.5A CN105472818B (en) | 2016-01-13 | 2016-01-13 | A kind of LED illumination circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610021008.5A CN105472818B (en) | 2016-01-13 | 2016-01-13 | A kind of LED illumination circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105472818A CN105472818A (en) | 2016-04-06 |
| CN105472818B true CN105472818B (en) | 2018-01-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610021008.5A Active CN105472818B (en) | 2016-01-13 | 2016-01-13 | A kind of LED illumination circuit |
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| Country | Link |
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| CN (1) | CN105472818B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108040402A (en) * | 2018-02-07 | 2018-05-15 | 中山市钜赢照明科技有限公司 | A kind of LED illumination circuit |
| CN111935874B (en) * | 2018-04-20 | 2023-09-05 | 上海路傲电子科技有限公司 | Linear constant current driving chip and multi-chip parallel LED lighting circuit |
| US11917737B2 (en) | 2021-08-02 | 2024-02-27 | Bio-Rad Laboratories, Inc. | Circuit for sharing current between parallel LEDs or parallel strings of LEDs |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7680636B2 (en) * | 2006-03-15 | 2010-03-16 | The Mathworks, Inc. | System and method of generating equation-level diagnostic error messages for use in circuit simulation |
| CN202634782U (en) * | 2012-04-28 | 2012-12-26 | 淄博职业学院 | LED constant-current drive circuit |
| CN103517523A (en) * | 2013-09-25 | 2014-01-15 | 天津金玛光电有限公司 | High-voltage constant-current drive circuit and LED light source with same |
| CN203661367U (en) * | 2013-12-24 | 2014-06-18 | 上海半导体照明工程技术研究中心 | A drive circuit for an LED agricultural fluorescent lamp |
| CN204664955U (en) * | 2015-05-25 | 2015-09-23 | 广州市力侬照明技术有限公司 | A kind of novel G9 lamp |
| CN205510462U (en) * | 2016-01-13 | 2016-08-24 | 黎时勇 | LED lighting circuit |
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| CN105472818A (en) | 2016-04-06 |
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| PB01 | Publication | ||
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| TR01 | Transfer of patent right |
Effective date of registration: 20180119 Address after: The new Mao Industrial Zone Qinglong road 528478 Guangdong city of Zhongshan province Henglan Town of the third floor of No. 5 Patentee after: Zhongshan Ju win Lighting Technology Co., Ltd. Address before: No. 026, pagazhen ruins, Huarong County, Yueyang, Hunan Patentee before: Li Shiyong |
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| TR01 | Transfer of patent right |