CN101848581A - LED (light-emitting diode) lighting circuit - Google Patents
LED (light-emitting diode) lighting circuit Download PDFInfo
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- CN101848581A CN101848581A CN201010198556A CN201010198556A CN101848581A CN 101848581 A CN101848581 A CN 101848581A CN 201010198556 A CN201010198556 A CN 201010198556A CN 201010198556 A CN201010198556 A CN 201010198556A CN 101848581 A CN101848581 A CN 101848581A
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Abstract
The invention relates to an LED lighting circuit, which is characterized in that a constant flow source which comprises a voltage-regulator tube D3, a fifth current-limiting resistor R5 and a triode Q1 is additionally arranged in the traditional LED lighting circuit. Since the constant flow source is additionally arranged in the traditional LED lighting circuit, and the most notable effect of the constant flow source is stable output current, the output reliability is ensured; even if voltage has fluctuation, the output can not be influenced, and the current output to each branch is constant, and therefore, users can add the number of LED light-emitting diodes according to self needs. The users not only can add the number of the LEDs but also can put the LEDs or change the colors of the diodes at will, and for example, some festive products can be added with colorful light-emitting diodes.
Description
Technical field
The present invention relates to a kind of lighting circuit, particularly a kind of LED lighting circuit.
Background technology
Country all advocates low-carbon economy at present, sets up a kind of pattern based on low energy consumption, low pollution, low emission.LED compares with present electricity-saving lamp with incandescent lamp in the past, and in the brightness of sending out same, its power consumption is 1/20 of an incandescent lamp, is 1/10 of electricity-saving lamp, substitutes the two kinds of lamps in front so LED will become, and becomes the leading role on the illumination market.
The present main problem of LED illuminating product is that brightness is not enough, and its main cause is that the quantity of light-emitting diode is not enough, can not increase light-emitting diode arbitrarily in other words.Such as the family expenses aspect, we just wish that higher demand is arranged in the brightness, but these products satisfy on user's needs just difficult.Secondly on output current, a lot of products are unstable on output current.These product great majority mainly are by steps such as transformation, rectification, filtering, voltage stabilizings, export to load at last, we know that the voltage of power supply administration often is unsettled, output end voltage at product also has fluctuation like this, there is the voltage of fluctuation will make the load holding capacity descend, thereby cause the decline on the properties of product, have a greatly reduced quality on the service life to product.
Summary of the invention
Purpose of the present invention is to provide a kind of electric current output to stablize and can increase as required the LED lighting circuit of LED light-emitting diode quantity at the deficiencies in the prior art.
Technical scheme of the present invention is: the end at existing LED lighting circuit increases a constant-current source, and this constant-current source is by voltage-stabiliser tube D3, and the 5th current-limiting resistance R5 and triode Q1 form.
The LED lighting circuit that increases constant-current source is constructed as follows: an end of capacitor C 1 and resistance R 4 parallel connections is connected with power supply second terminals of input port P1, the other end of capacitor C 1 and resistance R 4 parallel connections is connected with the positive half cycle input of the bridge rectifier of being made up of rectifying tube D1-D4, the end of fuse F1 is connected with power supply first terminals of input port P1, and the other end of fuse F1 is connected with the negative half period input of bridge rectifier; The positive pole of bridge rectifier is connected the minus earth of bridge rectifier with the second current-limiting resistance R2 with second terminals of load LED lamp through the first current-limiting resistance R1; First terminals of load LED are connected with the collector electrode of triode Q1, and the emitter of triode Q1 is through the 5th current-limiting resistance R5 ground connection, and the base stage of triode Q1 is connected with the node of the 3rd current-limiting resistance R3 and voltage-stabiliser tube D3; The 3rd current-limiting resistance R3 is connected the other end ground connection of voltage-stabiliser tube D3 with the node of the first current-limiting resistance R1 and the second current-limiting resistance R2; Filter capacitor C2 is connected the other end ground connection of filter capacitor C2 with the node of the first current-limiting resistance R1 and the second current-limiting resistance R2.
Load LED lamp is composed in parallel by the LED light emitting diode string, and the LED lamp is made up of 24 LED light-emitting diodes, and after wherein every 6-12 was connected into one group, four groups in parallel again.
The invention has the beneficial effects as follows: owing in existing led circuit, increased a constant-current source, the most significant effect of constant-current source is an outputting current steadily, thereby guaranteed the reliability of output, even voltage has fluctuation, can not influence output, output all is constant at the electric current of each branch road, and therefore the user can increase the quantity of LED light-emitting diode according to the needs of oneself.The user not only can increase the quantity of LED, can also arbitrarily put the position of light-emitting diode or the color of conversion diode, as some celebrating products, can increase by seven color light-emitting diodes.
Description of drawings
Fig. 1 is a circuit diagram of the present invention.
D3 is a voltage-stabiliser tube among the figure, and R5 is the 5th current-limiting resistance, and Q1 is a triode, and the three forms constant-current source.
Fig. 2 is the circuit interconnect pattern of load LED light-emitting diode.
Embodiment
Below in conjunction with accompanying drawing 1 and Fig. 2 execution mode is described further.
A kind of LED lighting circuit, capacity is that 105J/400V decompression capacitor C1 and the resistance of 1 microfarad is that an end of the protective resistance R4 parallel connection of 800K is connected with 220V power supply second terminals 2 of described input port P1, and the other end of capacitor C 1 and resistance R 4 parallel connections is connected with the positive half cycle input of the bridge rectifier of being made up of rectifying tube D1-D4; Current limit is that the end of the fuse F1 of 0.5A is connected with 220V power supply first terminals 1 of described input port P1, and the other end of fuse F1 is connected with the negative half period input of bridge rectifier, and fuse F1 plays overcurrent protection to circuit.
The positive pole of bridge rectifier is connected the minus earth of bridge rectifier with the second current-limiting resistance R2 with second terminals 2 of load LED lamp through the first current-limiting resistance R1; First terminals 1 of load LED are connected with the collector electrode of triode Q1, and the emitter of triode Q1 is through the 5th current-limiting resistance R5 ground connection, and the base stage of triode Q1 is connected with the node of the 3rd current-limiting resistance R3 and voltage-stabiliser tube D3; The 3rd current-limiting resistance R3 is connected the other end ground connection of voltage-stabiliser tube D3 with the node of the first current-limiting resistance R1 and the second current-limiting resistance R2; Filter capacitor C2 is connected the other end ground connection of filter capacitor C2 with the node of the first current-limiting resistance R1 and the second current-limiting resistance R2.Model is that the rectifying tube D1-D4 of IN4007 constitutes bridge rectifier, output be steady direct current, the filter capacitor C2 of 100u/60V plays the effect of filtering, promptly jiggly direct current is converted into direct current more stably.The resistance of the first current-limiting resistance R1 and the second current-limiting resistance R2 is 5K, and the resistance of the 3rd current-limiting resistance R3 is 30K, and three resistance have played cushioning effect to circuit, can prevent that voltage is too high suddenly.The burning voltage of voltage-stabiliser tube D3 is 10.1V, and the resistance of the 5th current-limiting resistance R5 is 72K.8050 type triode Q1 are the NPN type, because the burning voltage effect of voltage-stabiliser tube D3, so the base current of triode Q1 is played stable effect, so the electric current of the collector electrode of triode Q1 also is stable and amplifies, i.e. i
c=β i
bThat is to say that voltage-stabiliser tube D3, the 5th current-limiting resistance R5 and triode Q1 form constant-current source, the effect of playing of load being stablized output current.Because constant-current source guarantees that the electric current of output is stable, output current is constant at each branch road, so the user can increase several LED light-emitting diodes according to the needs of oneself.
Load LED lamp is made up of 24 LED light-emitting diodes, wherein per 6 be connected into one group after, four groups are in parallel again.
Load LED lamp, the user can be according to the needs of oneself, and every group by 6 LED light-emitting diodes that are increased to 10 series connection.
Claims (3)
1. a LED lighting circuit comprises input port, electric capacity, resistance, bridge rectifier, fuse, load etc., it is characterized in that:
(1) in the LED lighting circuit, is provided with one by pressurizer D3, the constant-current source that the 5th current-limiting resistance R5 and triode Q1 form;
(2) each device of constant-current source is to connect like this in the LED lighting circuit, the collector electrode of triode Q1 is connected with first terminals (1) of load LED lamp, the emitter of triode Q1 is through the 5th current-limiting resistance R5 ground connection, the base stage of triode Q1 is connected with the node of the 3rd current-limiting resistance R3 and voltage-stabiliser tube D3, the other end ground connection of voltage-stabiliser tube D3.
2. a kind of LED lighting circuit according to claim 1 is characterized in that: described load LED lamp is composed in parallel by the LED light emitting diode string.
3. a kind of LED lighting circuit according to claim 2 is characterized in that: described load LED lamp is made up of 24 LED light-emitting diodes, and after wherein every 6-12 was connected into one group, four groups in parallel again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010198556A CN101848581A (en) | 2010-06-11 | 2010-06-11 | LED (light-emitting diode) lighting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010198556A CN101848581A (en) | 2010-06-11 | 2010-06-11 | LED (light-emitting diode) lighting circuit |
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| Publication Number | Publication Date |
|---|---|
| CN101848581A true CN101848581A (en) | 2010-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010198556A Pending CN101848581A (en) | 2010-06-11 | 2010-06-11 | LED (light-emitting diode) lighting circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102644876A (en) * | 2012-04-20 | 2012-08-22 | 侯李光 | LED light tube capable of replacing T5 fluorescent lamp |
| CN103096575A (en) * | 2011-10-27 | 2013-05-08 | 迪尔航空航天有限公司 | Lighting Device For An AC Power Supply |
| CN103840325A (en) * | 2012-11-23 | 2014-06-04 | 上海立新液压有限公司 | Wide voltage range alternating-current and direct-current universal lamp-provided plug |
| CN105592607A (en) * | 2014-10-22 | 2016-05-18 | 中国科学院苏州纳米技术与纳米仿生研究所 | Constant-current control circuit structure applied to high-power LED device |
| CN115083358A (en) * | 2022-07-05 | 2022-09-20 | 珠海格力电器股份有限公司 | Display panel backlight control circuit and control method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201114911Y (en) * | 2007-10-22 | 2008-09-10 | 东莞市百分百科技有限公司 | A LED current-constant driving circuit |
| CN201657412U (en) * | 2010-02-09 | 2010-11-24 | 章小宝 | LED illumination circuit |
-
2010
- 2010-06-11 CN CN201010198556A patent/CN101848581A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201114911Y (en) * | 2007-10-22 | 2008-09-10 | 东莞市百分百科技有限公司 | A LED current-constant driving circuit |
| CN201657412U (en) * | 2010-02-09 | 2010-11-24 | 章小宝 | LED illumination circuit |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103096575A (en) * | 2011-10-27 | 2013-05-08 | 迪尔航空航天有限公司 | Lighting Device For An AC Power Supply |
| CN102644876A (en) * | 2012-04-20 | 2012-08-22 | 侯李光 | LED light tube capable of replacing T5 fluorescent lamp |
| CN103840325A (en) * | 2012-11-23 | 2014-06-04 | 上海立新液压有限公司 | Wide voltage range alternating-current and direct-current universal lamp-provided plug |
| CN105592607A (en) * | 2014-10-22 | 2016-05-18 | 中国科学院苏州纳米技术与纳米仿生研究所 | Constant-current control circuit structure applied to high-power LED device |
| CN115083358A (en) * | 2022-07-05 | 2022-09-20 | 珠海格力电器股份有限公司 | Display panel backlight control circuit and control method |
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| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20100929 |