CN101360371A - Power supply circuit for LED - Google Patents

Power supply circuit for LED Download PDF

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Publication number
CN101360371A
CN101360371A CNA2008101351866A CN200810135186A CN101360371A CN 101360371 A CN101360371 A CN 101360371A CN A2008101351866 A CNA2008101351866 A CN A2008101351866A CN 200810135186 A CN200810135186 A CN 200810135186A CN 101360371 A CN101360371 A CN 101360371A
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CN
China
Prior art keywords
voltage
power supply
circuit
light
supply circuits
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.)
Pending
Application number
CNA2008101351866A
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Chinese (zh)
Inventor
陈元杰
谢効辑
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Universal Optoelectronics Co Ltd
Original Assignee
Universal Optoelectronics Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Universal Optoelectronics Co Ltd filed Critical Universal Optoelectronics Co Ltd
Priority to CNA2008101351866A priority Critical patent/CN101360371A/en
Publication of CN101360371A publication Critical patent/CN101360371A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a LBD power supply circuit, which includes a stabilizer, a voltage multiplier circuit and a constant current circuit; wherein, the stabilizer is used to switch the frequency of an AC power supply and generate an AC voltage; the voltage multiplier circuit is used to take the AC voltage and commute the AC voltage to output a DC voltage, the constant current circuit is used to take the DC voltage and export a constant current to LBD. Using the voltage multiplier circuit can not only commute the AC voltage, but also generate a bigger DC voltage simultaneously, and can improve the input quality of AC voltage generated by the stabilizer; thereby being favorable to driving LBD.

Description

The power supply circuits of light-emitting diode
Technical field
The present invention is relevant for a kind of power supply circuits of light-emitting diode, by the connection of stabilizer, voltage-multiplying circuit and constant-current circuit, to provide preferable power supply quality to light-emitting diode.
Background technology
Light-emitting diode (Light Emitting Diode, LED) owing to possessing characteristic and the advantage that the life-span is long, volume is little, caloric value is low, power consumption is little, reaction speed reaches the lasting progress of luminous efficiency soon arranged, therefore be considered to be the light source optimal selection of New Times, light-emitting diode becomes the illumination and the display light source of a new generation already.Yet because the principle of luminosity of the principle of luminosity of light-emitting diode and traditional lighting source difference to some extent, therefore in the time of on the electric supply installation that light-emitting diode is applied in traditional lighting source, certainly will to change the power supply circuits on the electric supply installation, just may export the power supply that is fit to the driven for emitting lights diode, and help the lifting of the luminous efficiency and the wattage of light-emitting diode.
Traditional lighting source, for example light-emitting components such as sight lamp or Halogen lamp LED are to drive with alternating voltage mostly, therefore in order to the power supply circuits of the electric supply installation inside that drives these traditional lighting light sources, main purpose is in order to produce a stable alternating voltage.When providing the power supply of light-emitting diode with these electric supply installations, often further the power supply circuits of electric supply installation 101 inside are changed, the power supply circuits of electric supply installation 101 inside of Halogen lamp LED (as MR 16) can be replaced by the power supply circuits 11 of light-emitting diode as shown in Figure 1, electric supply installation 101 can stably drive the light-emitting device of being made up of light-emitting diode 21 20 whereby.Though can reach the purpose that light-emitting device 20 is provided stabling current by the power supply circuits 11 of changing electric supply installation 101 inside, yet the power supply circuits 11 of replacing electric supply installation 101 inside will certainly cause consumer's puzzlement in the use.
Certainly also power supply circuits partly are incorporated into the light-emitting device inside that light-emitting diode is formed, and the supply power voltage that further traditional electric supply installation 102 is produced is changed by manufacturer.As shown in Figure 2 rectification circuit 13 and constant-current circuit 15 are arranged on light-emitting device 20 inside, and by rectification circuit 13 originally the alternating voltage that produced of the electric supply installation 102 of Halogen lamp LEDs carry out rectification, to export a direct current voltage to constant-current circuit 15, and constant-current circuit 15 will be exported a corresponding electric current to light-emitting diode 21, whereby to reach the purpose of driven for emitting lights diode 21.
Rectification circuit 13 mainly carries out a direct current voltage of rectification and output in order to the alternating voltage that the stabilizer 19 of electric supply installation 102 is exported, yet stabilizer 19 is a high-frequency device and has load effect, therefore the direct voltage exported of rectification circuit 13 as can't stablize provide enough voltage to constant-current circuit 15, to cause light-emitting diode 21 can't obtain enough and stable electric current and/or voltage, and then have influence on the luminosity performance of light-emitting diode 21.
Summary of the invention
Technical problem solved by the invention is to provide a kind of power supply circuits of light-emitting diode, wherein voltage-multiplying circuit is in order to receive an alternating voltage and to export a direct current voltage, and direct voltage is greater than the crest voltage of alternating voltage, can provide enough direct voltage to constant-current circuit whereby.
Secondary objective of the present invention is to provide a kind of power supply circuits of light-emitting diode, and wherein voltage-multiplying circuit is in order to carry out rectification and expansion to the alternating voltage that is received, and voltage-multiplying circuit can provide the direct voltage of preferable output quality to constant-current circuit whereby.
Another purpose of the present invention is to provide a kind of power supply circuits of light-emitting diode, and wherein voltage-multiplying circuit can provide enough direct voltage to constant-current circuit, and light-emitting diode can obtain enough electric currents and/or voltage by constant-current circuit whereby.
Another purpose of the present invention, be to provide a kind of power supply circuits of light-emitting diode, wherein constant-current circuit can be exported bigger electric current and/or voltage, more light-emitting diode can be serially connected in the output of constant-current circuit whereby, and the brightness that helps improving light-emitting device integral body.
Another purpose of the present invention is to provide a kind of power supply circuits of light-emitting diode, and wherein constant-current circuit and/or voltage-multiplying circuit can be incorporated into light-emitting device inside, can traditional electric supply installation be powered by light-emitting diode whereby.
For achieving the above object, the invention provides a kind of power supply circuits of light-emitting diode, include: a stabilizer, in order to produce an alternating voltage; One voltage-multiplying circuit, in order to receiving the alternating voltage that stabilizer produced and to export a direct current voltage, and direct voltage is greater than the crest voltage of alternating voltage; And a constant-current circuit, in order to receive the direct voltage that voltage-multiplying circuit produced and to export an electric current.
For enabling further to understand feature of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing, yet appended accompanying drawing only provide with reference to and explanation, be not to be used for the present invention is limited.
Description of drawings
Fig. 1 is the organigram of light-emitting device commonly used and electric supply installation;
Fig. 2 is the organigram of light-emitting device commonly used and electric supply installation;
Fig. 3 is the square connection diagram of power supply circuits one preferred embodiment of light-emitting diode of the present invention;
Fig. 4 is the circuit diagram of the stabilizer of power supply circuits of the present invention;
Fig. 5 is the circuit diagram of the voltage-multiplying circuit of power supply circuits of the present invention;
The oscillogram of the direct voltage that Fig. 6 exports for voltage-multiplying circuit of the present invention;
Fig. 7 is the circuit connection diagram of the constant-current circuit of power supply circuits of the present invention;
Fig. 8 is the organigram of light-emitting device of the present invention and electric supply installation.
Wherein, Reference numeral:
101 electric supply installations, 102 electric supply installations
11 power supply circuits, 13 rectification circuits
15 constant-current circuits, 20 light-emitting devices
21 light-emitting diodes
30 power supply circuits, 31 stabilizers
311 bridge rectifiers, 313 start-up circuits
315 inductance, 33 voltage-multiplying circuits
35 constant-current circuits, 351 constant current integrated circuit components
37 AC power
40 light-emitting devices, 41 light-emitting diodes
50 electric supply installations
Embodiment
See also Fig. 3, be the square connection diagram of power supply circuits one preferred embodiment of light-emitting diode of the present invention.As shown in the figure, power supply circuits 30 of the present invention include a stabilizer 31, a voltage-multiplying circuit 33 and a constant-current circuit 35, wherein stabilizer 31 is in order to produce an alternating voltage V1,33 of voltage-multiplying circuits are in order to receive this alternating voltage V1, and this alternating voltage V1 carried out rectification and expansion, to export a direct current voltage V2 to constant-current circuit 35.
When practical application, stabilizer 31 can be the employed stabilizer of general traditional lighting light source, and for example in an embodiment of the present invention, stabilizer is the employed stabilizer of Halogen lamp LED (MR 16).Stabilizer 31 is main in order to the reception AC power 37 that Utilities Electric Co. supplied, and AC power 37 is changed to export an alternating voltage V1.The alternating voltage V1 that is exported after changing through stabilizer 31 is compared to AC power 37, has different frequencies and more stable output, and applicable to general lighting source, for example the frequency of alternating voltage V1 is greater than AC power 37, and can drive Halogen lamp LED MR 16 by this alternating voltage V1.
Power supply circuits 30 of the present invention are mainly in order to driven for emitting lights diode 41, and generally speaking light-emitting diode 41 drives with the current source of direct current mostly.Therefore when using, must increase other circuit, and alternating voltage V1 is carried out rectification and conversion with driven for emitting lights diode 41.
Mainly be that the alternating voltage V1 that utilizes 33 pairs of stabilizers 31 of voltage-multiplying circuit to be produced carries out rectification in the present invention, will be after finishing rectification by voltage-multiplying circuit 33 outputs one direct current voltage V2.Voltage-multiplying circuit 33 not only can carry out rectification with output dc voltage V2 to alternating voltage V1, and the direct voltage V2 by voltage-multiplying circuit 33 outputs will be greater than the crest voltage of alternating voltage V1, the direct voltage V2 of voltage-multiplying circuit 33 outputs will be the multiple of the crest voltage of alternating voltage V1 in ideal conditions, for example 1 times, 2 times ... Deng.
After voltage-multiplying circuit 33 is converted into direct voltage V2 with alternating voltage V1, just can further direct voltage V2 be sent to constant-current circuit 35, constant-current circuit 35 will be exported corresponding direct voltage V3 and electric current I according to the direct voltage V2 that receives, and provide electric current I to the light-emitting diode 41 that is connected with constant-current circuit 35, to reach the purpose of driven for emitting lights diode 41.
When using,, just can be connected in series the light-emitting diode 41 of a greater number, and can effectively improve whole luminosity at the output of constant-current circuit 35 if constant-current circuit 35 can provide bigger direct voltage V3.Mainly be to utilize voltage-multiplying circuit 33 that the alternating voltage V1 that stabilizer 31 is provided is carried out rectification and expansion in the present invention, can provide higher direct voltage V2 to constant-current circuit 35 compared to structure commonly used, and make constant-current circuit 35 can produce bigger direct voltage V3 to export to light-emitting diode 41.
Concerning power supply circuits commonly used mainly is to carry out rectification with the alternating voltage V1 that 13 pairs of stabilizers 31 of rectification circuit are produced, if when the power supply quality instability of stabilizer 31 maybe can't produce enough voltage, just can cause light-emitting diode 41 can't produce the former brightness that should have.For example when practical application, tend to because the making quality of stabilizer 31 is very different, and the stabilizer 31 that causes part only can provide not enough voltage, make constant-current circuit 35 can't obtain the light-emitting diode 41 that enough voltage goes to drive serial connection, when constant-current circuit 35 can't provide enough electric current I and/or voltage to light-emitting diode 41, just can the brightness of light-emitting diode 41 be impacted.
For purposes of the invention because the alternating voltage V1 that can utilize voltage-multiplying circuit 33 that stabilizer 31 is exported carries out rectification and expansion, therefore just do not have the problem generation that above-mentioned light-emitting diode 41 can't be obtained enough voltage in use.In other words, originally 33 voltages that can provide of stabilizer can effectively be provided in connection by stabilizer 31 and voltage-multiplying circuit 33, provide enough voltage to constant-current circuit 35, and can more light-emitting diode 41 be set at load end, not only can increase the quantity that is provided with of light-emitting diode 41, also help the lifting of luminosity simultaneously.
See also Fig. 4 and Fig. 5, be respectively the stabilizer of power supply circuits of the present invention and the circuit diagram of voltage-multiplying circuit.As shown in the figure, stabilizer 31 mainly includes a bridge rectifier 311 and a start-up circuit 313, wherein bridge rectifier 311 is in order to carry out rectification with AC power 37, and start-up circuit 313 then is made up of transistor Q1/Q2, and can form an alternating voltage V1 on inductance 315.
Voltage-multiplying circuit 33 is an all-wave two voltage-multiplying circuits in the present embodiment, can respond to and produce an induced voltage Vs by 31 output AC voltage V1 of 1 pair of stabilizer of inductance L, then again induced voltage Vs is carried out rectification to export a direct current voltage V2, wherein direct voltage V2 is the twice of the crest voltage of alternating voltage V1.As shown in Figure 6, diode D1 will conducting during at positive half cycle as induced voltage Vs, simultaneously capacitor C 1 is charged; And diode D2 will conducting during at negative half period as induced voltage Vs, simultaneously capacitor C 2 is charged.In other words will charge to capacitor C 1 during at positive half cycle as induced voltage Vs, and on capacitor C 1, form voltage Vc1, and the crest voltage Vs1 of voltage Vc1=Vs; When induced voltage Vs will charge to capacitor C 2 during at negative half period, and on capacitor C 2, form voltage Vc2, and the crest voltage Vs1 of voltage Vc2=Vs, can between the end points a1 of voltage-multiplying circuit 33 and b1, form a direct current voltage V2 whereby, and direct voltage V2 will be the twice of the crest voltage Vs1 of induced voltage Vs, or the twice of the crest voltage of alternating voltage V1.Certainly voltage-multiplying circuit 33 can be two voltage-multiplying circuits, many voltage-multiplying circuits, half-wave voltage-multiplying circuit or full-wave voltage multiplier circuit when practical application.
Voltage-multiplying circuit 33 can be connected with constant-current circuit 35, as shown in Figure 7, the end points a1/b1 of voltage-multiplying circuit 33 is connected with the end points a2/b2 of constant-current circuit 35 respectively, and receive direct voltage V2 whereby exporting a direct current voltage V3 and an electric current I by constant-current circuit 35, and electric current I can be in order to driven for emitting lights diode 41.For example constant-current circuit 35 includes a constant current integrated circuit component (constant current IC) 351 and external circuit such as electric capacity, resistance, inductance and/or diode in the present embodiment.Certainly the circuit diagram of the described stabilizer 31 of Fig. 4 only is one embodiment of the invention, voltage-multiplying circuit 33 can be connected with the stabilizer of different types when practical application, and the alternating voltage that stabilizer produced is carried out rectification and expansion.In addition, the connected mode between voltage-multiplying circuit 33 and the constant-current circuit 35 also is not limited to connected mode shown in Figure 7.
See also Fig. 8, be the organigram of light-emitting device of the present invention and electric supply installation.As shown in the figure, light-emitting device 40 mainly is made up of a plurality of light-emitting diode 41, voltage-multiplying circuit 33 and constant-current circuit 35 can be incorporated into light-emitting device 40 inside in an embodiment of the present invention, make light-emitting device 40 include light-emitting diode 41, constant-current circuit 35 and voltage-multiplying circuit 33, stabilizer 31 then is arranged in the electric supply installation 50, can carry out rectification by voltage-multiplying circuit 33 whereby, and power with 35 pairs of light-emitting diodes 41 of constant-current circuit.Certainly in different embodiment, also voltage-multiplying circuit 33 and/or constant-current circuit 35 can be arranged on electric supply installation 50 inside, make light-emitting device 40 inside not be provided with voltage-multiplying circuit 33.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims (16)

1. the power supply circuits of a light-emitting diode is characterized in that, include:
One stabilizer is in order to produce an alternating voltage;
One voltage-multiplying circuit, in order to receiving the alternating voltage that this stabilizer produces and to export a direct current voltage, and this direct voltage is greater than the crest voltage of this alternating voltage; And
One constant-current circuit is in order to receive the direct voltage that this voltage-multiplying circuit produces and to export an electric current.
2. according to the power supply circuits shown in the claim 1, it is characterized in that, include at least one light-emitting diode and be connected with this constant-current circuit and receive this electric current.
3. according to the power supply circuits shown in the claim 1, it is characterized in that, include a light-emitting device, and this light-emitting device includes at least one light-emitting diode and this constant-current circuit.
4. according to the power supply circuits shown in the claim 3, it is characterized in that this light-emitting device includes this voltage-multiplying circuit.
5. according to the power supply circuits shown in the claim 2, it is characterized in that this voltage-multiplying circuit is arranged on this light-emitting device outside.
6. according to the power supply circuits shown in the claim 1, it is characterized in that this stabilizer includes a bridge rectifier.
7. according to the power supply circuits shown in the claim 1, it is characterized in that voltage-multiplying circuit is one or two voltage-multiplying circuit or many voltage-multiplying circuits.
8. according to the power supply circuits shown in the claim 1, it is characterized in that this voltage-multiplying circuit is half-wave voltage-multiplying circuit or full-wave voltage multiplier circuit.
9. according to the power supply circuits shown in the claim 1, it is characterized in that this voltage-multiplying circuit is in order to respond to this alternating voltage and to produce an induced voltage.
10. according to the power supply circuits shown in the claim 9, it is characterized in that voltage-multiplying circuit is in order to carry out rectification and to export this direct voltage to this induced voltage.
11. the power supply circuits according to shown in the claim 9 is characterized in that, this direct voltage is the multiple of the crest voltage of this induced voltage.
12. the power supply circuits according to shown in the claim 1 is characterized in that, this direct voltage is the multiple of the crest voltage of this alternating voltage.
13. the power supply circuits according to shown in the claim 1 is characterized in that, this stabilizer is in order to receiving an AC power, and this AC power is converted into this alternating voltage.
14. the power supply circuits according to shown in the claim 13 is characterized in that, this AC power and this alternating voltage have different frequencies.
15. the power supply circuits according to shown in the claim 1 is characterized in that, this constant-current circuit comprises a constant current integrated circuit component.
16. the power supply circuits according to shown in the claim 15 is characterized in that, this constant-current circuit comprises an external circuit.
CNA2008101351866A 2008-08-15 2008-08-15 Power supply circuit for LED Pending CN101360371A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA2008101351866A CN101360371A (en) 2008-08-15 2008-08-15 Power supply circuit for LED

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA2008101351866A CN101360371A (en) 2008-08-15 2008-08-15 Power supply circuit for LED

Publications (1)

Publication Number Publication Date
CN101360371A true CN101360371A (en) 2009-02-04

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ID=40332682

Family Applications (1)

Application Number Title Priority Date Filing Date
CNA2008101351866A Pending CN101360371A (en) 2008-08-15 2008-08-15 Power supply circuit for LED

Country Status (1)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102368881A (en) * 2011-07-06 2012-03-07 晋宝电气(浙江)有限公司 Constant current driving system used for LED lamp
CN102072418B (en) * 2009-11-23 2012-06-20 福华电子股份有限公司 AC light-emitting diode device with high reliability and long service life
CN105554960A (en) * 2016-02-04 2016-05-04 浙江富春照明电器有限公司 Light emitting diode (LED) driving circuit special for AC 110V

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102072418B (en) * 2009-11-23 2012-06-20 福华电子股份有限公司 AC light-emitting diode device with high reliability and long service life
CN102368881A (en) * 2011-07-06 2012-03-07 晋宝电气(浙江)有限公司 Constant current driving system used for LED lamp
CN105554960A (en) * 2016-02-04 2016-05-04 浙江富春照明电器有限公司 Light emitting diode (LED) driving circuit special for AC 110V

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Application publication date: 20090204