CN201821552U - LED constant current driving circuit - Google Patents
LED constant current driving circuit Download PDFInfo
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- CN201821552U CN201821552U CN2010205377158U CN201020537715U CN201821552U CN 201821552 U CN201821552 U CN 201821552U CN 2010205377158 U CN2010205377158 U CN 2010205377158U CN 201020537715 U CN201020537715 U CN 201020537715U CN 201821552 U CN201821552 U CN 201821552U
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000005670 electromagnetic radiation Effects 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
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- 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]
- H05B45/30—Driver circuits
- H05B45/395—Linear regulators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model relates to an LED constant current driving circuit. The LED constant current driving circuit is composed of a transistor T1, a transistor T2, a resistor R1 and a resistor R2 which are connected together; when the transistor is a normal NPN type triode, a base electrode B of the transistor T1 is connected in series with the resistor R1 and further connected in parallel with an collector electrode C of the transistor T1 to be used as a driving circuit input end IN for being connected with an anode of a rectifier, a collector electrode C of the transistor T2 is connected with the base electrode B of the transistor T1, a base electrode B of the transistor T2 is connected with an emitter electrode E of the transistor T1, the resistor R2 is connected between the emitter electrode E of the transistor T1 and the emitter electrode E of the transistor T2, the emitter electrode E of the transistor T2 is used as a driving circuit output end OUT for being connected with an anode of an LED lamp string, and a cathode of the LED lamp string is connected with a cathode of the rectifier. The circuit is only composed of two transistors or field-effect tubes connected with two resistors, so that the circuit is simple in structure and low in manufacturing cost; and the circuit has small volume, high efficiency and low reactive power loss.
Description
Technical field
The utility model relates to a kind of LED constant-current drive circuit.
Background technology
The LED illumination epoch arrive, and as the green light source of a new generation, will progressively replace conventional light source and enter huge numbers of families future.
Yet, LED is a semiconductor device that is operated in low-voltage, direct current, need under constant electric current environment, work, for common civil power, must be through after voltage transitions and the constant current control, can offer LED and use, circuit or the equipment of finishing this process are referred to as led driver or drive circuit usually.At present, the drive scheme of widespread usage has: switching mode constant-current driving, resistance-capacitance depressurization formula drive and linear constant-current driving.
The switching mode constant-current driving has conversion efficiency and constant current accuracy advantages of higher and is widely used, but its shortcoming is the circuit complexity, the cost height, and, can produce certain electromagnetic radiation to surrounding enviroment and electrical network during work, when concentrating use in a large number owing to adopted high-frequency oscillating circuits, this problem is particularly evident, if deal with improperly, will produce the electric equipment of periphery and disturb, even electrical network is produced pollution.
It is to adopt capacitor that alternating current is carried out step-down and current limliting that the resistance-capacitance depressurization formula drives, offering LED after rectifier rectification uses, be characterized in cheap, also be used in the low side bargain centre in a large number at present, the fatal shortcoming of resistance-capacitance depressurization is that efficient is low, reactive loss in the circuit is big, its power factor only is about 0.2-0.4, relevant regulations according to U.S.'s " Energy Star " and European Union, the PF value (power factor) of domestic lighting equipment should be greater than 0.7, and the PF value of commercial lighting should obviously, use the light fixture of resistance-capacitance depressurization to be not suitable for outlet greater than 0.9.In addition, decompression capacitor is just powering in a flash, and its internal resistance is very little, so the moment that powers on is quite big to the impulse current of load, can shorten the useful life of LED greatly.
Linear constant-current driving is used under the environment of low pressure, direct current (as 12-24V), if at 220V(or 110V usually) use on the civil power, then must be earlier be that suitable voltage carries out constant current later on again and controls with Switching Power Supply or transformer with high pressure conversion.Its shortcoming is that cost height, efficient are low, therefore, and application less.
How using lower cost, create well behaved LED constant-flow driver, is the target that people pursue always, also is a problem that is worth research.
Summary of the invention
The purpose of this utility model is to provide a kind of constant-current drive circuit of LED lamp, is intended to make its circuit structure simple, cheap; Volume is little, the efficient height, and reactive loss is little.
The utility model is connected to form by transistor T 1, transistor T 2, resistance R 1 and resistance R 2.Transistor can adopt common NPN type triode, also can adopt N channel field-effect pipe, and both can also mix use.In addition, except that the triode or N channel field-effect pipe that use the NPN type, also can be with PNP transistor or P-channel field-effect transistor (PEFT) pipe.When transistor is common NPN type triode, behind the base stage B series resistor R1 of transistor T 1 with the collector electrode C of transistor T 1 and connect the back and be connected with the positive pole of rectifier as drive circuit input IN, the collector electrode C of transistor T 2 is connected with the base stage B of transistor T 1, the base stage B of transistor T 2 is connected with the emitter E of transistor T 1, resistance R 2 is connected between the emitter E of the emitter E of transistor T 1 and transistor T 2, the emitter E of transistor T 2 is connected with the positive pole of LED lamp string as drive circuit output OUT, and the negative pole of LED lamp string is connected (Fig. 1) with the negative pole of rectifier.In fact, output current is to be provided by transistor T 1, by the emitter of transistor T 1 by resistance R 2 output of flowing through, and in direct current pressure drop of the two ends of R2 generation, this voltage is controlled the base potential (base stage of T1 is controlled by the collector electrode of T2) of T1 after T2 amplifies, make its output current in certain scope, keep stable, with the purpose (following circuit analysis, its principle is identical therewith, the Therefore, omited) that reaches constant current.
The utility model, when transistor is N channel field-effect pipe, behind the grid G series resistor R1 of transistor T 1 with the drain D of transistor T 1 and connect the back and be connected with the positive pole of rectifier as drive circuit input IN, the drain D of transistor T 2 is connected with the grid G of transistor T 1, the grid G of transistor T 2 is connected with the source S of transistor T 1, resistance R 2 is connected between the source S of the source S of transistor T 1 and transistor T 2, the source S of transistor T 2 is connected with the positive pole of LED lamp string as drive circuit output OUT, and the negative pole of LED lamp string is connected with the negative pole of rectifier.
The utility model, be N channel field-effect pipe when stating transistor T 1, transistor T 2 is common NPN type triode, behind the grid G series resistor R1 of transistor T 1 with the drain D of transistor T 1 and connect the back and be connected with the positive pole of rectifier as drive circuit input IN, the collector electrode C of transistor T 2 is connected with the grid G of transistor T 1, the base stage B of transistor T 2] be connected with the source S of transistor T 1, resistance R 2 is connected between the emitter E of the source S of transistor T 1 and transistor T 2, the emitter E of transistor T 2 is connected with the positive pole of LED lamp string as drive circuit output OUT, and the negative pole of LED lamp string is connected with the negative pole of rectifier.
The utility model, when transistor is the positive-negative-positive triode, behind the base stage B series resistor R1 of transistor T 1 with the emitter E of transistor T 1 and connect the negative pole that the back is connected LED lamp string, the positive pole of LED lamp string is connected with the positive pole of rectifier, the emitter E of transistor T 2 is connected with the base stage B of transistor T 1, the base stage B of transistor T 2 is connected with the collector electrode C of transistor T 1, resistance R 2 is connected between the collector electrode C of the collector electrode C of transistor T 1 and transistor T 2, and the collector electrode C of transistor T 2 is connected with the negative pole of rectifier.When using P type device because its polarity of voltage is opposite with N type device, so also difference of the connection of LED lamp string, electric current by the T2 emitter through R1 to output, the base stage of T2 is controlled by the collector electrode of T1, its operation principle is stated identical with the front.
The utility model, described rectifier can use bridge rectifier D 1-D4, half-wave rectifier or full-wave rectifier.
The utility model, because circuit is is only connected and composed by two transistors or field effect transistor and two resistance, its circuit structure is simple, and is cheap; Volume is little, the efficient height, and reactive loss is little, and the Gao Shida of power factor is more than 0.95, circuit does not have the EMI(electromagnetic radiation); Conversion efficiency, PF(power factor) important indicator such as value all can reach the related request of the star of European Union and american energy.In addition, this circuit is also supported at present external popular controllable silicon phase dimming, and available controllable silicon dimmer is implemented light modulation to the LED lamp of this drives, and its dimming behavior is stable, and output optical line is good.
Description of drawings
Fig. 1-Fig. 6 is respectively the circuit theory diagrams of embodiment 1-6.
Specific embodiments
Embodiment 1, with reference to Fig. 1, a kind of LED constant-current drive circuit is connected to form by transistor T 1, transistor T 2, resistance R 1 and resistance R 2.Transistor is common NPN type triode, behind the base stage B series resistor R1 of transistor T 1 with the collector electrode C of transistor T 1 and connect the back and be connected with the positive pole of rectifier D1-D4 as drive circuit input IN, the collector electrode C of transistor T 2 is connected with the base stage B of transistor T 1, the base stage B of transistor T 2 is connected with the emitter E of transistor T 1, resistance R 2 is connected between the emitter E of the emitter E of transistor T 1 and transistor T 2, the emitter E of transistor T 2 is connected with the positive pole of LED lamp string as drive circuit output OUT, and the negative pole of LED lamp string is connected with the negative pole of rectifier D1-D4.When electric main was 220V, this circuit was applicable to and drives the lamp string that 50-80 low-power LED lamp formed, and is fit to LED electricity-saving lamp or the use of LED bulb of 3-5W, and its power factor is greater than 0,95, and operating efficiency is greater than 90%.When electric main was 110V, this circuit was applicable to and drives the lamp string that 20-40 low-power LED lamp formed.
Its operation principle is: among the figure, transistor T 1, T2, resistance R 1, R2 forms a linear constant current circuit, among the figure, electrical equipment contact L, N directly connects electric main (110 or 220V), be loaded into 1 of bridge rectifier that D1-D4 forms from the alternating voltage of civil power by fuse (FUSE), 3 ends, direct voltage after the bridge rectifier rectification is 2, the output of 4 ends, and positive pole is connected to the collector electrode C of transistor T 1, R1 is the biasing resistor of T1, for the base stage B of TI provides suitable bias current, the electric current that the emitter of T1 will amplify by R2 offers the positive pole of load LED1-LEDN (the lamp string that is together in series by a plurality of LED lamps), the negative pole of LED lamp string then is directly connected to the VSS(negative pole end of rectifier), R2 is the sample resistance of transistor T 2, when electric current passes through, to produce a voltage drop at the two ends of R2, the size of this voltage with the resistance of resistance and passed through current related, can calculate magnitude of voltage on the R2 by formula: " V=IR ", from the formula as can be seen, at resistance is under the situation of fixing, the electric current of logical R2 is big more, the voltage that its two ends produced is just high more, this voltage is directly connected to the base stage B of transistor T 2, and amplified by T2, make T2 the current potential of collector electrode C descend and reduced the base bias voltage of T1, make T1 reduce output current, the decline of the output current of T1, voltage on the R2 is descended equally, this signal feeds back to the base stage of T1 again by T2, so, two transistors check and balance, circulation repeatedly, make current stabilization on the T1 on a suitable value, the size of output current can obtain by the resistance of regulating R1 and R2.
Embodiment 3, with reference to Fig. 3, a kind of LED constant-current drive circuit is connected to form by transistor T 1, transistor T 2, resistance R 1 and resistance R 2.Transistor T 1 is a N channel field-effect pipe, transistor T 2 is common NPN type triode, behind the grid G series resistor R1 of transistor T 1 with the drain D of transistor T 1 and connect the back and be connected with the positive pole of rectifier D1-D4 as drive circuit input IN, the collector electrode C of transistor T 2 is connected the base stage B of transistor T 2 with the grid G of transistor T 1
Be connected with the source S of transistor T 1, resistance R 2 is connected between the emitter E of the source S of transistor T 1 and transistor T 2, the emitter E of transistor T 2 is connected with the positive pole of LED lamp string as drive circuit output OUT, and the negative pole of LED lamp string is connected with the negative pole of rectifier D1-D4.Its operation principle is similar to embodiment 1, and effect is identical, describes and omits.
Embodiment 4, with reference to Fig. 4, a kind of LED constant-current drive circuit is connected to form by transistor T 1, transistor T 2, resistance R 1 and resistance R 2.Transistor is the positive-negative-positive triode, behind the base stage B series resistor R1 of transistor T 1 with the emitter E of transistor T 1 and connect the negative pole that the back is connected LED lamp string, the positive pole of LED lamp string is connected with the positive pole of rectifier D1-D4, the emitter E of transistor T 2 is connected with the base stage B of transistor T 1, the base stage B of transistor T 2 is connected with the collector electrode C of transistor T 1, resistance R 2 is connected between the collector electrode C of the collector electrode C of transistor T 1 and transistor T 2, and the collector electrode C of transistor T 2 is connected with the negative pole of rectifier D1-D4.Its operation principle is similar to embodiment 1, and effect is identical, describes and omits.
Embodiment 5, with reference to Fig. 5, because the application in some place does not need built-in rectifier, then have only four elements T 1, T2, R2 and R2 in the circuit, at this moment its volume can be accomplished littler, even chip directly can be encapsulated in the small-sized device support such as TO-92, a TO-223, or in the container of small size and form a two ends passive device.During use, the input IN of constant-current drive circuit is connected with the positive pole of rectifier, the output OUT of constant-current drive circuit is connected with the positive pole of LED lamp string, and the negative pole of LED lamp string is connected with the negative pole of rectifier and gets final product.
Embodiment 6, with reference to Fig. 6, if this constant-current drive circuit is used for the LED fluorescent lamp, or Ceiling light, because used LED quantity is more, then the LED lamp can be divided into a plurality of unit (four unit that only draw among the figure can increase and decrease as required), each unit is drive respectively, and can a shared rectifier to save used element because the element of circuit is few, all components and parts can be encapsulated in the very little space and makes module or thick film circuit.More the chip of all semiconductor device directly can be encapsulated in the ic shell of a small-sized DIP or SOP and constitute an integrated circuit.During use, total input IN of constant-current drive circuit is connected with the positive pole of rectifier, the output OUT1-OUT4 of the constant-current drive circuit of each unit is connected with the positive pole of the LED lamp string of each unit respectively, and the negative pole of the LED string of each unit is connected with the negative pole of rectifier respectively and gets final product.
The above is preferred embodiment of the present utility model, is not limited to the utility model, all modifications of being done in the utility model spirit, is equal to and replaces or improvement etc., all should be included in the scope that the utility model protects.
Claims (5)
1. LED constant-current drive circuit, it is characterized in that: by transistor T 1, transistor T 2, resistance R 1 and resistance R 2 connect to form, when transistor is common NPN type triode, behind the base stage B series resistor R1 of transistor T 1 with the collector electrode C of transistor T 1 and connect the back and be connected with the positive pole of rectifier as drive circuit input IN, the collector electrode C of transistor T 2 is connected with the base stage B of transistor T 1, the base stage B of transistor T 2 is connected with the emitter E of transistor T 1, resistance R 2 is connected between the emitter E of the emitter E of transistor T 1 and transistor T 2, the emitter E of transistor T 2 is connected with the positive pole of LED lamp string as drive circuit output OUT, and the negative pole of LED lamp string is connected with the negative pole of rectifier.
2. LED constant-current drive circuit according to claim 1, it is characterized in that: when transistor is N channel field-effect pipe, behind the grid G series resistor R1 of transistor T 1 with the drain D of transistor T 1 and connect the back and be connected with the positive pole of rectifier as drive circuit input IN, the drain D of transistor T 2 is connected with the grid G of transistor T 1, the grid G of transistor T 2 is connected with the source S of transistor T 1, resistance R 2 is connected between the source S of the source S of transistor T 1 and transistor T 2, the source S of transistor T 2 is connected with the positive pole of LED lamp string as drive circuit output OUT, and the negative pole of LED lamp string is connected with the negative pole of rectifier.
3. LED constant-current drive circuit according to claim 1, it is characterized in that: when transistor T 1 is N channel field-effect pipe, when transistor T 2 is common NPN type triode, behind the grid G series resistor R1 of transistor T 1 with the drain D of transistor T 1 and connect the back and be connected with the positive pole of rectifier as drive circuit input IN, the collector electrode C of transistor T 2 is connected with the grid G of transistor T 1, the base stage B of transistor T 2 is connected with the source S of transistor T 1, resistance R 2 is connected between the emitter E of the source S of transistor T 1 and transistor T 2, the emitter E of transistor T 2 is connected with the positive pole of LED lamp string as drive circuit output OUT, and the negative pole of LED lamp string is connected with the negative pole of rectifier.
4. LED constant-current drive circuit according to claim 1, it is characterized in that: when transistor is the positive-negative-positive triode, behind the base stage B series resistor R1 of transistor T 1 with the emitter E of transistor T 1 and connect the negative pole that the back is connected LED lamp string, the positive pole of LED lamp string is connected with the positive pole of rectifier, the emitter E of transistor T 2 is connected with the base stage B of transistor T 1, the base stage B of transistor T 2 is connected with the collector electrode C of transistor T 1, resistance R 2 is connected between the collector electrode C of the collector electrode C of transistor T 1 and transistor T 2, and the collector electrode C of transistor T 2 is connected with the negative pole of rectifier.
5. according to the arbitrary described LED constant-current drive circuit of claim 1-4, it is characterized in that: described rectifier is bridge rectifier D 1-D4, half-wave rectifier or full-wave rectifier.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205377158U CN201821552U (en) | 2010-09-21 | 2010-09-21 | LED constant current driving circuit |
| PCT/CN2011/071709 WO2012037803A1 (en) | 2010-09-21 | 2011-03-11 | Constant current driving circuit for led |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205377158U CN201821552U (en) | 2010-09-21 | 2010-09-21 | LED constant current driving circuit |
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| Publication Number | Publication Date |
|---|---|
| CN201821552U true CN201821552U (en) | 2011-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205377158U Expired - Fee Related CN201821552U (en) | 2010-09-21 | 2010-09-21 | LED constant current driving circuit |
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| Country | Link |
|---|---|
| CN (1) | CN201821552U (en) |
| WO (1) | WO2012037803A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102695336A (en) * | 2012-05-22 | 2012-09-26 | 曹勇 | LED (light-emitting diode) lamp |
| CN103269540A (en) * | 2013-05-07 | 2013-08-28 | 木林森股份有限公司 | Double-circuit complementary linear LED constant current circuit |
| CN103582228A (en) * | 2012-08-12 | 2014-02-12 | 王济生 | Current stabilizing circuit for 5watt LED environmental-friendly energy-saving lamp |
| CN106604481A (en) * | 2017-02-20 | 2017-04-26 | 王汉忠 | A LED linear constant current soft start drive circuit |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103152895B (en) * | 2013-03-26 | 2015-07-29 | 青海聚能达新能源开发有限公司 | The circuit of the direct driving LED of a kind of alternating current |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2829279Y (en) * | 2005-11-02 | 2006-10-18 | 周志邦 | Full-color LED discolor drive circuit |
| CN201450639U (en) * | 2009-07-08 | 2010-05-05 | 华南理工大学 | Highly reliable LED constant current drive circuit that saves circuit resources |
-
2010
- 2010-09-21 CN CN2010205377158U patent/CN201821552U/en not_active Expired - Fee Related
-
2011
- 2011-03-11 WO PCT/CN2011/071709 patent/WO2012037803A1/en not_active Ceased
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102695336A (en) * | 2012-05-22 | 2012-09-26 | 曹勇 | LED (light-emitting diode) lamp |
| CN103582228A (en) * | 2012-08-12 | 2014-02-12 | 王济生 | Current stabilizing circuit for 5watt LED environmental-friendly energy-saving lamp |
| CN103582228B (en) * | 2012-08-12 | 2015-05-20 | 王济生 | Current stabilizing circuit for 5watt LED environmental-friendly energy-saving lamp |
| CN103269540A (en) * | 2013-05-07 | 2013-08-28 | 木林森股份有限公司 | Double-circuit complementary linear LED constant current circuit |
| CN106604481A (en) * | 2017-02-20 | 2017-04-26 | 王汉忠 | A LED linear constant current soft start drive circuit |
| CN106604481B (en) * | 2017-02-20 | 2018-04-13 | 王汉忠 | L ED linear constant-current soft start driving circuit |
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| Publication number | Publication date |
|---|---|
| WO2012037803A1 (en) | 2012-03-29 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110504 Termination date: 20180921 |
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| CF01 | Termination of patent right due to non-payment of annual fee |