CN201114911Y - A LED current-constant driving circuit - Google Patents
A LED current-constant driving circuit Download PDFInfo
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- CN201114911Y CN201114911Y CNU2007201817265U CN200720181726U CN201114911Y CN 201114911 Y CN201114911 Y CN 201114911Y CN U2007201817265 U CNU2007201817265 U CN U2007201817265U CN 200720181726 U CN200720181726 U CN 200720181726U CN 201114911 Y CN201114911 Y CN 201114911Y
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Abstract
The utility model discloses an LED constant current driving circuit, comprises a power module which connects the commercial power and a light group consisting of a plurality of light emitting diodes and is characterized in that the power module comprises an alternating current power supply input end, a rectification circuit, an isolation voltage transformation circuit and a constant current output circuit which are serially connected in sequence; the light group is connected with the output end of the constant current output circuit. Being provided with the constant current circuit and adopting the working mode of constant current, the LED constant current driving circuit can effectively solve the problems of bad uniformity of brightness and short service life of the light emitting diodes; lighting fittings which adopt the LED constant current driving circuit are low in power consumption and strong in brightness and can achieve the lighting performance of a fluorescent lamp.
Description
Technical field:
The utility model relates to led drive circuit, relates in particular to a kind of LED constant-current drive circuit that adopts constant current technology, can drive the High Power Factor of large-power light-emitting diodes work.
Background technology:
Semiconductor lighting (LED) technical development at present is quite swift and violent, replacing the fluorescent lighting status step by step, and why development trend like this is arranged, be because it has the technical advantage of following several respects: 1, fail safe is good: semiconductor light-emitting-diode is organic resin and semi-conducting material, the solid state device of metal material encapsulation, firm in structure, can not produce loosening during normal the use, broken situation, and this luminous element is a cold light source, drive circuit does not have high voltage yet, therefore, can not cause related accident, himself fail safe and environmentAL safety is all fine to external world because of the inner high voltage of high temperature and broken back.2, long service life: light-emitting diode useful life is tens thousand of hours, and incandescent lamp often has only hundreds of hour useful life, the nominal of fluorescent lamp also has only several thousand hours useful life, and therefore, the semiconductor lighting technology is all more much longer than the life-span of any conventional light source in the past.3, luminous efficiency height: in the power bracket below 3 watts, the luminous efficiency of various light sources all reduces significantly, and the luminous efficiency of luminous tube remains on than higher level, and therefore, the light efficiency of semiconductor lamp will be far above other light sources during the micropower illumination.4, rich color: light-emitting diode has shades of colour, can satisfy the requirement of white light various special lightings in addition.5, drive and regulation and control convenient: light-emitting diode is a current-type driver spare, changes the current value that flows through light-emitting diode and just can change brightness, therefore, drives and regulates and control all very convenient.6, volume is little, and is in light weight: semiconductor light-emitting-diode is miniature point-source of light, therefore, can make very little volume, and weight is also very light.7, abandoning device does not have heavy metal pollution, is beneficial to environmental protection.These technical advantages have determined light emitting semiconductor device will develop into the novel illumination light source, change the existing Lighting Industry structure and the market structure, change people's living environment.The novel semi-conductor light source needs the special driving circuit to ensure its operate as normal.Because every watt of cost very high (at present generally at ten to 20 yuan/watt) of great power LED, so when driving a great power LED more than 3 watts, it is high many that the cost that the cost of light source drives is relatively wanted, therefore carrying out drive circuit seems quite important.High-power LED drive circuit on the market generally all is to adopt the constant voltage type of drive at present, and the shortcoming of this mode is the variation along with circuital current, and the luminosity of each LED can be inconsistent; Simultaneously, often also can make that the electrorheological of integrated circuit is big, and then cause the damage or the lost of life of whole LED lamp group because of the damage of certain LED of LED lamp group the inside.In recent years, along with the application of the laser diode of high-power and high-luminance, its manufacturing cost reduced gradually, and its illumination effect, combining to reach the requirement of fluorescent lamp lighting fully, but at present but because the above-mentioned defective that its drive circuit exists has restricted the extensive application of LED light fixture.
The utility model content:
At the existing existing above-mentioned technical deficiency of led drive circuit that adopts the constant voltage mode, the utility model purpose is, provide a kind of and be provided with constant current degree circuit and isolate transforming circuit, can effectively solve the brightness uniformity problem of LED and prolong the high power LED constant-current driving circuit of the High Power Factor in LED life-span.
For realizing the utility model purpose, the technical scheme that is provided is:
A kind of LED constant-current drive circuit, it comprises that the connection civil power reaches a power module of the lamp group of being made up of several light-emitting diodes, it is characterized in that: described power module, comprise ac power input end, rectification circuit, isolation transforming circuit, the constant current output circuit of serial connection successively, the output of described constant current output circuit connects the lamp group.Described constant current output circuit is formed by connecting by a comparator TL431 and a current amplification circuit.
Described LED constant-current drive circuit is characterized in that: between described ac power input end and the rectification circuit, also be serially connected with the electromagnetic compatibility circuit of a common mode mode.
Described LED constant-current drive circuit is characterized in that: also be serially connected with a circuit of power factor correction between described rectification circuit and the isolation transforming circuit.
Described LED constant-current drive circuit, it is characterized in that: in the described circuit of power factor correction, the control input end of control integrated package is provided with the PC817 current-sensing circuit, is provided with a field effect transistor between the negative pole end of the voltage input line circle of control output end and isolation transforming circuit, the connecting to neutral line.
Described LED constant-current drive circuit is characterized in that: the cathode output end of the voltage of described isolation transforming circuit is connected to filter circuit.
Described LED constant-current drive circuit is characterized in that: the described constant current output circuit of back termination of described filter circuit.
Described LED constant-current drive circuit is characterized in that: described several light-emitting diodes, and it is divided into several lamp groups in parallel, and wherein each lamp group is made up of the light-emitting diode that several are connected in series successively again.
The beneficial effects of the utility model are: because the utility model is provided with constant-current circuit, adopts the constant current working method, therefore can effectively solve the brightness uniformity problem of each LED and prolong life-span of LED; It can not make that the electrorheological of whole group is big because of the damage of certain LED of LED lamp group the inside, avoids the damage of whole LED lamp group or the shortening in life-span; Because the working method that it has also adopted input and output to isolate, its output are the low pressure of safety; It has also adopted the EMC circuit, can effectively suppress electromagnetic interference; Adopt ligthing paraphernalia of the present utility model, it is low in energy consumption, and brightness is strong, the power of single light-emitting diode lamp tube of its driving can reach 16 watts or more than, and its brightness of illumination can be equivalent to 80 watts fluorescent lamp; Of the present utility model cheap for manufacturing cost, in its manufacture process, use, the existing mercury pollution phenomenon of fluorescent lamp can not appear, meet environmental protection standard; Its light luminance can be regulated automatically, so that its brightness of illumination meets various lighting requirements, because it is low in energy consumption, can save a large amount of energy simultaneously, safety problems such as the existing glass material of incandescent lamp bulb or fluorescent tube breaks particularly can not occur.
Below in conjunction with drawings and Examples the utility model is described in further detail.
Description of drawings:
Fig. 1 is the circuit structure block diagram of the utility model embodiment;
Fig. 2 is the circuit theory diagrams of Fig. 1.
Embodiment:
Embodiment: referring to Fig. 1, Fig. 2, the LED constant-current drive circuit that the utility model embodiment provides, it comprises ac power input end, EMC circuit, rectification circuit, circuit of power factor correction, isolation transforming circuit, the constant current output circuit of serial connection successively, its input connects civil power, and its output connects LED lamp group.
Concrete, comprise the lamp group of forming by 8 light-emitting diodes respectively in the present embodiment, wherein each light-emitting diode of each lamp group is connected successively; The two ends of this lamp group connect the output of described drive circuit; Among other embodiment, many group LED lamp groups also can be set, its output that is connected this drive circuit parallel with one another.Aforesaid LED constant-current drive circuit, it comprises a power module particularly, this module comprises the ac power input end that connects civil power, and the common mode mode EMC circuit that has been linked in sequence successively, rectification circuit, a circuit of power factor correction, one isolate transforming circuit, a constant current output circuit, and this constant current output circuit connects and connects the lamp group.The light-emitting diode that adopts in the present embodiment is the LED of 1W 350MA, and its minimum number is for can be 1～28, or more.A lamp group has been shown among Fig. 2.Described constant current output circuit is formed by connecting by a comparator TL431 and a current amplification circuit.
Aforesaid circuit of power factor correction comprises a control integrated package and a current-sensing circuit, this control input end, integrated package ground connects the PC817 current-sensing circuit, establishes a field effect transistor Q2 between the negative pole end (5 ends among Fig. 2) of the voltage input line circle of its control output end and isolation transforming circuit, the connecting to neutral.Behind induction of PC817 current-sensing circuit and the conducting electric current, the control input end gets electric, and field effect transistor Q2 is then opened in the control output end, and field effect transistor Q2 controls the conducting of voltage input line circle circuit again.Realize the correction and the power output of input power factor.
Aforesaid isolation transforming circuit is a mutual inductor L3, the electric current that it will obtain from the alternating current input cuts off through the transformation of mutual inductor L3, flows to constant current output circuit again, can reduce the influence of fluctuations of the current strength in the circuit, output is realized safe power supply.
In this constant current output circuit, the positive pole of isolating the voltage output end of transforming circuit rectify meet diode D7 after, also be connected to filter circuit (coil L2).The collector electrode of the back termination triode Q1 of filter circuit, the emitter of the negative pole termination triode Q1 of the voltage output end of isolation transforming circuit, the negative pole end of lamp group connects the base stage of triode Q1 through resistance.The collector electrode of triode Q1 is just meeting comparator TL431, comparator TL431 negative pole connecting to neutral, and lamp group positive terminal connects comparator TL431 control end through resistance.Comparator TL431 control end is responded to the variation of the electric current of flowing through lamps group in real time, and constant current control, and the electric current of triode Q1 collector electrode is in the current range of setting.The electric current of emitter output will be in ± 2% fluctuation range like this, and powerful electric current output is provided.
As described in above-mentioned embodiment, adopt the construction or design identical or similar with it, resulting other LED constant-current drive circuit is all in protection range of the present utility model.
Claims (8)
1, a kind of LED constant-current drive circuit, it comprises that the connection civil power reaches a power module of the lamp group of being made up of several light-emitting diodes, it is characterized in that: described power module, comprise ac power input end, rectification circuit, isolation transforming circuit, the constant current output circuit of serial connection successively, the output of described constant current output circuit connects the lamp group.
2, LED constant-current drive circuit according to claim 1 is characterized in that: described constant current output circuit is formed by connecting by a comparator TL431 and a current amplification circuit.
3, LED constant-current drive circuit according to claim 1 is characterized in that: between described ac power input end and the rectification circuit, also be serially connected with the electromagnetic compatibility circuit of a common mode mode.
4, LED constant-current drive circuit according to claim 1 is characterized in that: also be serially connected with a circuit of power factor correction between described rectification circuit and the isolation transforming circuit.
5, LED constant-current drive circuit according to claim 4, it is characterized in that: in the described circuit of power factor correction, the control input end of its control integrated package is provided with the PC817 current-sensing circuit, is provided with a field effect transistor between the negative pole end of the voltage input line circle of its control output end and isolation transforming circuit, the connecting to neutral line.
6, LED constant-current drive circuit according to claim 1, it is characterized in that: the cathode output end of the voltage of described isolation transforming circuit is connected to filter circuit.
7, LED constant-current drive circuit according to claim 6, it is characterized in that: the rear end of described filter circuit connects described constant current output circuit.
8, LED constant-current drive circuit according to claim 1 is characterized in that: described lamp group is to be composed in series successively by several light-emitting diodes, and it is connected described constant current output circuit output; Several lamp groups are to be connected in parallel on this constant current output circuit output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201817265U CN201114911Y (en) | 2007-10-22 | 2007-10-22 | A LED current-constant driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201817265U CN201114911Y (en) | 2007-10-22 | 2007-10-22 | A LED current-constant driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201114911Y true CN201114911Y (en) | 2008-09-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201817265U Expired - Lifetime CN201114911Y (en) | 2007-10-22 | 2007-10-22 | A LED current-constant driving circuit |
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| CN (1) | CN201114911Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101848581A (en) * | 2010-06-11 | 2010-09-29 | 南昌大学 | LED (light-emitting diode) lighting circuit |
| CN101883463A (en) * | 2010-07-23 | 2010-11-10 | 余明高 | Constant-current AC LED (Alternating Current Light Emitting Diode) lighting circuit |
| CN107110481A (en) * | 2014-08-28 | 2017-08-29 | 格雷科技术工业公司 | LED pipe drive circuit for the fluorescent tube replacement with ballast and without ballast |
-
2007
- 2007-10-22 CN CNU2007201817265U patent/CN201114911Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101848581A (en) * | 2010-06-11 | 2010-09-29 | 南昌大学 | LED (light-emitting diode) lighting circuit |
| CN101883463A (en) * | 2010-07-23 | 2010-11-10 | 余明高 | Constant-current AC LED (Alternating Current Light Emitting Diode) lighting circuit |
| CN107110481A (en) * | 2014-08-28 | 2017-08-29 | 格雷科技术工业公司 | LED pipe drive circuit for the fluorescent tube replacement with ballast and without ballast |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080910 |