CN105472818A - LED lighting circuit - Google Patents
LED lighting circuit Download PDFInfo
- Publication number
- CN105472818A CN105472818A CN201610021008.5A CN201610021008A CN105472818A CN 105472818 A CN105472818 A CN 105472818A CN 201610021008 A CN201610021008 A CN 201610021008A CN 105472818 A CN105472818 A CN 105472818A
- Authority
- CN
- China
- Prior art keywords
- diode
- constant current
- led
- circuit
- lamp bead
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000011324 bead Substances 0.000 claims abstract description 24
- 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
- 238000005286 illumination Methods 0.000 claims description 15
- 238000005070 sampling Methods 0.000 claims description 11
- 239000003990 capacitor Substances 0.000 claims description 6
- 238000005538 encapsulation Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 230000001105 regulatory effect Effects 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 an LED lighting circuit. The LED lighting circuit comprises a rectifier bridge circuit, an LED lamp bead group and a linear constant current IC, wherein the rectifier bridge circuit is used for rectifying alternating current voltage from an alternating current power supply and converting the rectified alternating current voltage into direct current voltage; the linear constant current IC is used for converting the direct current voltage from the rectifier bridge circuit into direct current with the constant magnitude; the LED lamp bead group comprises a plurality of lamp bead strings that are connected in series; and each lamp bead string is provided with a plurality of lamp beads that are connected in parallel. The LED lighting circuit is compact in structure, free of external constant current drive, high in constant current precision and capable of reducing cost; the lamp beads are combined in a serial-parallel hybrid manner, so that the normal operation of the rest LED is not affected when one of the LED lamp beads is damaged, and the probability of influencing the use of the lamp is greatly reduced; meanwhile, copper sheet of two circuits for power supply in a circuit board can be widened to the maximum, so that multiple LED lighting circuit can be connected in series; and therefore, the number of wiring wire ends in engineering construction is saved, and the construction cost is reduced.
Description
Technical field
The present invention relates to a kind of circuit, particularly relate to a kind of LED illumination circuit.
Background technology
Light-emitting diode is a kind of semiconductor electronic component that can be luminous.LED has that efficiency is high, the life-span is long, the not advantage not available for conventional light source such as high, the high reliability of cracky, switching speed, and therefore LED is widely used in every field as lighting source.
The characteristics of luminescence due to LED is all expressed as the function of electric current usually, instead of the function of voltage, and therefore, adopting constant-current source to drive can the brightness of control LED better.In addition the forward voltage drop excursion of LED is comparatively large, and the minor variations of forward voltage can cause larger forward current change, thus causes the larger change of brightness.So, adopt drive of constant voltage source can not ensure the consistency of LED luminance, and affect the reliability of LED, life-span and light decay.Therefore, high-brightness LED adopts constant-current source to drive usually.
LED drive circuit in the market, the damage of single lamp pearl easily causes the operation of whole circuit not smooth, and the unreasonable project installation difficulty that causes that components and parts are arranged simultaneously increases.
Summary of the invention
The object of the invention is, in order to solve technical problem involved in background technology, to provide a kind of LED illumination circuit.
Technical scheme of the present invention is:
A kind of LED illumination circuit, comprises rectifier circuit, LED lamp bead group and linear constant current IC;
Described rectifier circuit, for being converted into direct voltage by from after the ac voltage rectifier of AC power;
Described linear constant current IC, for being converted into the direct current of constant size by the direct voltage from described rectifier circuit;
Described LED lamp bead group is provided with the lamp pearl string of several mutual series connection, and each described lamp pearl string is provided with the LED lamp bead of several mutual parallel connection.
Preferably, described sampling feedback resistance and buffer capacitor, described LED lamp bead group, sampling feedback resistance and linear constant current IC are connected in series successively, described buffer capacitor is provided with 2, one of them is connected in parallel on outside the sequential circuit of LED lamp bead group, sampling feedback resistance and linear constant current IC, and another is connected in parallel on outside linear constant current IC.
Preferably, described rectifier circuit is provided with diode D1, D2, D3 and D4, the negative pole of described diode D1 and the negative pole of diode D2 are connected in series the pole as power supply circuits, the positive pole of described diode D3 and the positive pole of diode D4 are connected in series another pole as power supply circuits, one end that the positive pole of described diode D1 and the negative pole serial connection of diode D3 input as AC power, the other end that the positive pole of described diode D2 and the negative pole serial connection of diode D4 input as AC power.
Preferably, described linear constant current IC is that SO-8 encapsulates or TO252-2 encapsulates or SOT89-3 encapsulation.
Preferably, described linear constant current IC adopts CYT1000A chip or CYT1000AE chip or SM2082 chip.
Preferably, described LED illumination circuit integrity is arranged on circuit boards, described diode D1 and diode D2 is positioned at one end of circuit board, described diode D3 and diode D4 is positioned at the other end of circuit board, the positive pole of described diode D1 is connected by copper sheet with the negative pole of diode D3, and the positive pole of described diode D2 is connected by copper sheet with the negative pole of diode D4.
Preferably, described diode D1, D2, D3 and D4 are IN4007 type diode.
In sum, the present invention has following advantage:
Compact conformation of the present invention, omitting external constant current drives, and reduce cost, constant current accuracy is high.Lamp pearl string mixing combination can realize the effect that damage one LED lamp pearl does not affect the normal work of all the other LED, thus make light fixture affect the probability used greatly to reduce, thus reach and increase the service life, reduce the effect of maintenance times and cost.The copper sheet simultaneously obtaining two circuits of powering in wiring board can reach maximum width, thus it is multiple that this product can be connected in series, and saved in engineering construction the end of a thread quantity that connects up, and reduces construction cost.
Accompanying drawing explanation
Fig. 1 is the present embodiment circuit theory diagrams;
Fig. 2 is the SO-8 encapsulating structure figure of the CYT1000A chip of the present embodiment;
Fig. 3 is the TO252-2 encapsulating structure figure of the present embodiment;
Fig. 4 is the SOT89-3 encapsulating structure figure of the present embodiment.
Embodiment
As Figure 1-4, a kind of LED illumination circuit, comprises rectifier circuit, LED lamp bead group and linear constant current IC;
Described rectifier circuit, for being converted into direct voltage by from after the ac voltage rectifier of AC power;
Described linear constant current IC, for being converted into the direct current of constant size by the direct voltage from described rectifier circuit;
Described LED lamp bead group is provided with the lamp pearl string of several mutual series connection, and each described lamp pearl string is provided with the LED lamp bead of several mutual parallel connection.
LED lamp bead string and mixing combination can realize the effect that damage one LED lamp pearl does not affect the normal work of all the other LED, light fixture only just can be made luminous function is lost when three LEDs of fixed bit continuous adjacent all damage, thus the probability making light fixture affect use reduces greatly, thus reach and increase the service life, reduce the effect of maintenance times and cost.Described LED strip lamp pearl quantity in mixing circuit can according to the equal actual conditions adjustment of lamp pearl rated voltage, also useable resistance or other elements replace the lamp pearl of institute's vacancy to realize the increase and decrease of lamp pearl quantity.
Sampling feedback resistance and buffer capacitor, described LED lamp bead group, sampling feedback resistance and linear constant current IC are connected in series successively, described buffer capacitor is provided with 2, and one of them is connected in parallel on outside the sequential circuit of LED lamp bead group, sampling feedback resistance and linear constant current IC, and another is connected in parallel on outside linear constant current IC.
Described rectifier circuit is provided with diode D1, D2, D3 and D4, the negative pole of described diode D1 and the negative pole of diode D2 are connected in series the pole as power supply circuits, the positive pole of described diode D3 and the positive pole of diode D4 are connected in series another pole as power supply circuits, one end that the positive pole of described diode D1 and the negative pole serial connection of diode D3 input as AC power, the other end that the positive pole of described diode D2 and the negative pole serial connection of diode D4 input as AC power.
Described linear constant current IC is that SO-8 encapsulates or TO252-2 encapsulates or SOT89-3 encapsulation.Described linear constant current IC adopts CYT1000A chip or CYT1000AE chip or SM2082 chip.
TO252-2 wrapper is containing OUT end, GND end, current sampling feedback end (REXT).Described chip utilizes current sampling end outer meeting resistance to arrange electric current for 5mA-60mA, and output current does not change with chip OUT port voltage.The inner integrated temperature compensate function of this IC, will reduce output current automatically to reduce lamp interior temperature when chip internal junction temperature is more than 100 DEG C, thus prolongation LED lamp bead useful life.
Described LED illumination circuit integrity is arranged on circuit boards, described diode D1 and diode D2 is positioned at one end of circuit board, described diode D3 and diode D4 is positioned at the other end of circuit board, the positive pole of described diode D1 is connected by copper sheet with the negative pole of diode D3, and the positive pole of described diode D2 is connected by copper sheet with the negative pole of diode D4.Described diode D1, D2, D3 and D4 are IN4007 type diode.
This structure makes the copper sheet of two circuits of powering in wiring board can reach maximum width, thus makes this product can be connected in series 25-62 more than, has saved in engineering construction the end of a thread quantity that connects up, has reduced construction cost.
Except using except civil power (220V) powers in the circuit design of the present embodiment, the compatible cleverly circuit structure that low pressure (AC/DC24V) can be used to power.The present embodiment is 6 LEDs tandem, be 6 strings 3 also.When producing high voltage supply product, lamp pearl used is single 36V voltage, power is the special lamp pearl of 0.3W-1W, coordinates integrated linear constant current IC and rectifier diode to realize complete function.If the low pressure of being produced into (AC/DC24V) power product time, the lamp pearl used is single 2.0V-3.8V voltage, power is the lamp pearl of 0.05W-1W, high-voltage linear constant current IC will not be used in the product of this low-voltage power supply, circuit board structure use 0R equivalent resistance wire jumper make it skip IC part, now also to need the resistance be connected in series in lamp pearl suitably to be regulated share in a loop namely six LEDs unaffordable unnecessary supply power voltage, i.e. 24V-6*3.2V=4.8V, namely the voltage of about about 4.8V will be hindered by institute's crosstalk in the middle of circuit and share, its resistance can be calculated by Ohm's law.
More than illustrate it is only explanation of the invention, those of ordinary skill in the art's can completely is made to implement this programme, but be not limitation of the present invention, those skilled in the art can make to the present embodiment the amendment not having creative contribution as required after reading this specification, and these are all not creative amendments.As long as but be all subject to the protection of Patent Law in right of the present invention.
Claims (7)
1. a LED illumination circuit, is characterized in that: comprise rectifier circuit, LED lamp bead group and linear constant current IC;
Described rectifier circuit, for being converted into direct voltage by from after the ac voltage rectifier of AC power;
Described linear constant current IC, for being converted into the direct current of constant size by the direct voltage from described rectifier circuit;
Described LED lamp bead group is provided with the lamp pearl string of several mutual series connection, and each described lamp pearl string is provided with the LED lamp bead of several mutual parallel connection.
2. a kind of LED illumination circuit according to claim 1, it is characterized in that: described sampling feedback resistance and buffer capacitor, described LED lamp bead group, sampling feedback resistance and linear constant current IC are connected in series successively, described buffer capacitor is provided with 2, one of them is connected in parallel on outside the sequential circuit of LED lamp bead group, sampling feedback resistance and linear constant current IC, and another is connected in parallel on outside linear constant current IC.
3. a kind of LED illumination circuit according to claim 1, it is characterized in that: described rectifier circuit is provided with diode D1, D2, D3 and D4, the negative pole of described diode D1 and the negative pole of diode D2 are connected in series the pole as power supply circuits, the positive pole of described diode D3 and the positive pole of diode D4 are connected in series another pole as power supply circuits, one end that the positive pole of described diode D1 and the negative pole serial connection of diode D3 input as AC power, the other end that the positive pole of described diode D2 and the negative pole serial connection of diode D4 input as AC power.
4. a kind of LED illumination circuit according to claim 1, is characterized in that: described linear constant current IC is that SO-8 encapsulates or TO252-2 encapsulates or SOT89-3 encapsulation.
5. a kind of LED illumination circuit according to claim 1, is characterized in that: described linear constant current IC adopts CYT1000A chip or CYT1000AE chip or SM2082 chip.
6. a kind of LED illumination circuit according to claim 3, it is characterized in that: described LED illumination circuit integrity is arranged on circuit boards, described diode D1 and diode D2 is positioned at one end of circuit board, described diode D3 and diode D4 is positioned at the other end of circuit board, the positive pole of described diode D1 is connected by copper sheet with the negative pole of diode D3, and the positive pole of described diode D2 is connected by copper sheet with the negative pole of diode D4.
7. a kind of LED illumination circuit according to claim 3, is characterized in that: described diode D1, D2, D3 and D4 are rectification type diode.
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 true CN105472818A (en) | 2016-04-06 |
| CN105472818B CN105472818B (en) | 2018-01-23 |
Family
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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 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105472818B (en) |
Cited By (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 |
| CN111935874A (en) * | 2018-04-20 | 2020-11-13 | 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 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202634782U (en) * | 2012-04-28 | 2012-12-26 | 淄博职业学院 | LED constant-current drive circuit |
| US20130246025A1 (en) * | 2006-03-15 | 2013-09-19 | The Mathworks, Inc. | System and method of generating equation-level diagnostic error messages for use in circuit simulation |
| 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 |
-
2016
- 2016-01-13 CN CN201610021008.5A patent/CN105472818B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130246025A1 (en) * | 2006-03-15 | 2013-09-19 | 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 |
Cited By (4)
| 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 |
| CN111935874A (en) * | 2018-04-20 | 2020-11-13 | 上海路傲电子科技有限公司 | Linear constant-current driving chip and multi-chip parallel LED lighting 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105472818B (en) | 2018-01-23 |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| GR01 | Patent grant | ||
| 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 |