CN1859821A - Alternative current directly driving light emitting diode lighting device - Google Patents
Alternative current directly driving light emitting diode lighting device Download PDFInfo
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- CN1859821A CN1859821A CNA2005100703775A CN200510070377A CN1859821A CN 1859821 A CN1859821 A CN 1859821A CN A2005100703775 A CNA2005100703775 A CN A2005100703775A CN 200510070377 A CN200510070377 A CN 200510070377A CN 1859821 A CN1859821 A CN 1859821A
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Abstract
The present invention provides alternating current directly driving light emitting diode illuminator. It includes one or more series connected same polarity LED, series connected same polarity protective diode. The present invention uses diode for protecting light emitting diode without damage by negative voltage or static discharge (ESD), without adopting transformer, rectifying filter circuit and voltage regulator circuit complexity driving circuit, raising power supply change-over efficiency. The present invention also provides semi-revolution bidirectional and complete cycle bidirectional basic element circuit using above-mentioned single direction basic element circuit as basic.
Description
Technical field
The invention belongs to electricity field, be specifically related to the led lighting field.
Background technology
Because light-emitting diode has low-power consumption, advantages such as high brightness, the technical development of light-emitting diode and maturation provide high efficiency light emitting source for following lighting technology.
Traditionally, light-emitting diode is driven by DC power supply.Therefore, when light-emitting diode is used to exchange electrically driven (operated) illumination or signal indicating device, this device need one from alternating current to galvanic conversion equipment or circuit remove to control lumination of light emitting diode.Taiwan patent I220047 number " LED driving circuit " has been demonstrated a common LED driving circuit.This drive circuit has comprised a bridge rectifier alternating current has been become direct current, and voltage detector is controlled dc voltage value and a conduct current control circuit and made a return journey and substitute low frequency electric capacity.Also have, being applied in the red eye LED driving circuit among the U.S. Pat P5457450 used two rectifiers and two voltage compensating circuits.Though the dc drive circuit of light-emitting diode design at present is different, all many, complicated power consumptions again of circuit of element, power supply conversion efficiency are low, and the cost of manufacture height.
Except drive circuit, at present light-emitting diode also is heat radiation as the main crux of light emitting source, the improper problem of the heat radiation of electronic component and light-emitting diode all can influence useful life of light-emitting diode.
Summary of the invention
Technical problem to be solved by this invention provides the light emitting diode illuminating apparatus that a kind of simple alternating current directly drives.For this reason, the present invention by the following technical solutions: it comprises the identical light-emitting diode of polar orientation of one or more series connection, and, with the identical diode that shields of polar orientation of light-emitting diode series connection.
Diode of the present invention; its implication is that all that comprise diode can only allow the anti-negative pressure of energy of electric current one-way flow or the components and parts that Electrostatic Discharge shields to light-emitting diode, and wherein also comprising can anti-negative pressure or the light-emitting diode of Electrostatic Discharge.The illumination of indication of the present invention, its implication are that all are the function or the purposes of realization means with luminous, get the indication of optical illumination and signal such as daily.The alternating current of indication of the present invention is meant next power supply or the different frequency of other type and the AC power of using from normal lighting of voltage of AC network.The light-emitting diode of indication of the present invention can be non-lasing fluorescence diode, also can be the lasing fluorescence diode.
The number of light-emitting diode series connection can change according to characteristic and the technical parameter to the light-emitting diode of the requirement of brightness of illumination and use in the foregoing circuit.
Owing to adopt technique scheme; the present invention uses the diode pair light-emitting diode to protect in light-emitting diode (LED) illuminating circuit; make to have only and flow through diode directly to the light-emitting diode power supply that is used to throw light on diode alternating current in the same way; from negative pressure or Electrostatic Discharge, do not obtain damaging with the protection light-emitting diode; with traditional; with diode as the element in the current rectifying and wave filtering circuit; adopt the led lighting drive circuit of transformer and current rectifying and wave filtering circuit and voltage stabilizing circuit to compare; simplified circuit; improved power supply conversion efficiency; reduced cost of manufacture; simultaneously, also provide good basis for the heat dissipation problem that solves light-emitting diode.
Technique scheme provides a unidirectional basic element circuit.The various combination that is made of this basic element circuit can derive the lighting circuit of the direct driven for emitting lights diode of various alternating currents.
The led lighting intensity that alternating current directly drives can change along with variation of AC voltage.Whether people's vision experiences the frequency that this variation depends on that alternating current changes.For the order application of often throwing light on, in order to improve the comfortableness of vision, as further technical scheme, lighting circuit provided by the invention comprises the above-described circuit of two-way in parallel, but wherein one tunnel diode and the diode on light-emitting diode and another road and the opposite polarity directions of light-emitting diode.The number of the light-emitting diode on the two-way, color can be identical or different with characterisitic parameter.Like this, just constituted the two-way basic element circuit of half cycle of the direct driven for emitting lights diode illumination of the alternating current technology that can make full use of the generating positive and negative voltage half period, light-emitting diode is well dispelled the heat in negative half-cycle, also increased simultaneously the illumination duty ratio of whole circuit of LED, solved the susceptibility of vision effectively the direct driven for emitting lights diode illumination fluctuation of alternating current.As technical scheme further, it comprise the two-way basic element circuit of the aforesaid half cycle of array through series connection or/and the combinational circuit that is constituted in parallel.Like this, the directly anti-fault ability of driven for emitting lights diode lighting circuit of electricity of both can having increased exchanges also can improve brightness of illumination.
Under the situation that the heat dissipation problem of light-emitting diode is not given prominence to; not high or be in cold environment or ventilation and heat condition preferably under the environment such as power consumption; the present invention also can adopt following further technical scheme; the two ends of the light-emitting diode that the polar orientation of described one or more series connection is identical; or the two ends of several roads aforementioned circuit in parallel; be in series with the two-way polar orientation described diode that shield identical respectively with light-emitting diode; wherein one road diode of one end and wherein one road diode of the other end and power supply wherein an end is corresponding is connected remainder one road diode of an end and the other end corresponding be connected of remainder one road diode of the other end with power supply.The number of the light-emitting diode on the branch road in parallel, color can be identical or different with characterisitic parameter.This has constituted a kind of full Zhou Shuanxiang basic element circuit.Adopt this full Zhou Shuanxiang basic element circuit scheme, light-emitting diode is all luminous at the alternating current of positive and negative half period, so, reaching equal illumination, the quantity of used light-emitting diode is lacked half than the quantity of the light-emitting diode of the two-way basic element circuit of aforementioned half cycle.Correspondingly, as the further scheme of this scheme, it comprise several roads foregoing circuit through series connection or/and the combinational circuit that is constituted in parallel.
Similar scheme as above-mentioned further technical scheme, lighting circuit provided by the invention comprises above-mentioned unidirectional basic element circuit, the hybrid combining circuit of any two or three basic element circuit in two-way basic element circuit of half cycle and the full Zhou Shuanxiang basic element circuit, the quantity of the branch road of every kind of basic element circuit equates or does not wait, further, it comprises the array foregoing circuit of serial or parallel connection.And, the number of the light-emitting diode on the different branch, color can be identical or different with characterisitic parameter.Like this, can increase the flexibility of regulating illumination intensity and pattern.
As further technical scheme, described light-emitting diode by series connection or/and the identical light-emitting diode of several in parallel polar orientation replace.Described diode also can be by series connection or/and the identical diode replacement of several polar orientation in parallel.Like this, the flexibility that can further improve anti-fault ability or improve pattern.
As the further technical scheme that improves anti-fault ability, the light-emitting diode of single light-emitting diode or several series connection can be parallel with Zener (Zener) diode.
Can be in series with resistance on the unidirectional and two-way base lighting circuit of lighting circuit provided by the present invention, described resistance is that variable resistor or resistance are the fixed resistance of zero or a certain fixed value; Resistance also can like this, can be used for regulating the illumination intensity and the color of circuit of LED with unidirectional or/and the circuit that two-way base lighting circuit is made up is connected.
By these further technical schemes, the invention provides the anti-fault technology of the direct driven for emitting lights diode illumination of alternating current.Like this, some base lightings unit damages the inefficacy that can not cause whole lighting circuit.Have stronger fail safe and reliability with respect to traditional lighting circuit.Simultaneously, single light-emitting diode always is in the heat dissipation problem that the unidirectional basic element circuit that is less than the half period operating state and the two-way basic element circuit of half cycle have alleviated light-emitting diode greatly, has prolonged light-emitting diodes useful life; And,, further improve the comfortableness of vision owing to introduced two-way base lighting circuit.
The aft section of this specification will by embodiment and the invention will be further described in conjunction with the accompanying drawings, but these embodiment do not limit protection scope of the present invention.
Description of drawings
Fig. 1 is the circuit diagram of the embodiment of the invention 1.
Fig. 2 is the circuit diagram of the embodiment of the invention 2.
Fig. 3 is the electric current of the embodiment of the invention 2, the input and output oscillogram of voltage.
Fig. 4 is the circuit diagram of the embodiment of the invention 3.
Fig. 5 is the circuit diagram of the embodiment of the invention 4.
Fig. 6 is the circuit diagram of the embodiment of the invention 5.
Embodiment
Fig. 1 has demonstrated the directly basic circuit of the led lighting technology of driving of alternating current (AC), V
AcIt is AC power; R is a resistance; D is a diode; L is a light-emitting diode, and a plurality of light-emitting diodes are by sequence number L1, L2 ..., Ln distinguishes.Diode D is used for preventing that alternating current negative voltage and Electrostatic Discharge to the damage of light-emitting diode, shielding to light-emitting diode, to guarantee the stability of the light emitting diode illuminating apparatus that alternating current directly drives.Diode D also can adopt the light-emitting diode of anti-negative pressure of energy or Electrostatic Discharge; that is to say; this kind situation; what connect on this basic circuit can all be light-emitting diode, but wherein can anti-negative pressure or the light-emitting diode of Electrostatic Discharge can be considered as the defined diode D that shields of the present invention simultaneously.
The root a tree name is to the requirement of brightness, and a series of several light-emitting diodes L1～Ln can be together in series, and can use the use different color LEDs by the root a tree name.Resistance R is mainly used to the electric current that control flows is crossed light-emitting diode, to regulate the brightness of light-emitting diode, simultaneously light-emitting diode is carried out overload protection.When alternating current enters positive voltage during the half period, diode D conducting, light-emitting diode enters operating state; When alternating current enters negative voltage half-cycle, not conducting of diode D, light-emitting diode is not worked and is protected.
For the fault that prevents discrete component causes the failure of entire circuit, the diode D that demonstrates among Fig. 1 can have a plurality of diodes to be formed in parallel; The single light-emitting diode of demonstrating among Fig. 1 can be combined by a plurality of light-emitting diode connection in series-parallel as shown in Figure 4.
Embodiment 2
(L1～Ln) only is operated in the half period of alternating current, and to general daily AC power, the variation of the illumination intensity of light-emitting diode may produce the sensation of color break-up to eyes because light-emitting diode among Fig. 1.In order to alleviate or to eliminate this problem, Fig. 2 has demonstrated one allows two groups of light-emitting diodes replace luminous method in the positive and negative half period of alternating current respectively.Be D1 branch with the joining one group of led markers may of diode D1 among Fig. 2, with the joining one group of led markers may of diode D2 be D2 branch.Diode in the D1 branch and light-emitting diode are opposite with light-emitting diode polarity with diode in the D2 branch.So, when when being subjected to the alternating current positive voltage period, driving, one group of lumination of light emitting diode in the D1 branch, one group of light-emitting diode in the D2 branch is in closed condition.When driving when being subjected to the alternating current negative voltage period, one group of light-emitting diode in the D1 branch is in closed condition, one group of lumination of light emitting diode in the D2 branch.The number of the light-emitting diode in two branches, color can be identical or different with characterisitic parameter.
Among Fig. 2, R
c, R
1And R
2Being resistance, can be null value resistance, fixed resistance or variable resistor.Resistance R
1And R
2Can be identical value or different value.
Fig. 3 has demonstrated corresponding voltage and current waveform.Fig. 3 (a) has demonstrated input AC piezoelectric voltage waveform.The starting voltage of supposing diode is 0.7 volt, and the starting voltage of light-emitting diode is V
LVolt, the diode in D1 or the D2 branch and the starting voltage of light-emitting diode are:
V
on＝0.7+NV
L， (1)
Here N is the sum of one group of light-emitting diode connected in series in D1 or the D2 branch.With the positive voltage period is example, and the starting of light-emitting diode is t constantly
1For:
V
on＝NV
L+0.7＝V
PSin(2πft
1)， (2)
Here V
pBe the peak value of alternating current, f is the frequency of alternating current.From equation (2), t among Fig. 3 (e)
1Value be:
Like this, from t
1Can draw the ON time of light-emitting diode:
The duty ratio of light-emitting diode is:
Fig. 3 (c) has demonstrated the forward periodic voltage on the D1 branch light-emitting diode; Fig. 3 (d) has demonstrated the forward periodic voltage on the D2 branch light-emitting diode.
Fig. 3 (e) has demonstrated the current i that flows through light-emitting diode
dThe electric current that flows through each light-emitting diode depends on the resistance in the branch.Usually, the electric current on the light-emitting diode has determined the efficient and the brightness of illumination.The current i of light-emitting diode in the D1 branch
dCan obtain from equation (6):
Here R
fIt is the forward all-in resistance of one group of light-emitting diode in D1 branch.The current i of light-emitting diode in the D2 branch
dCan obtain from equation (7):
Here R
fIt is the forward all-in resistance of one group of light-emitting diode in D2 branch.
We can see each light-emitting diode only luminous t
2Time, and at other 4t
1+ t
2Be in closed condition on time always.This just says that also each light-emitting diode has the long heat radiation time.This helps prolonging light-emitting diode useful life.Light-emitting diode in D1 and the D2 branch is alternately luminous, has doubled the duty ratio of general lighting effectively, has significantly reduced the susceptibility of vision to the variation of led lighting intensity; This establishes down the basis for the direct driven for emitting lights diode illumination of alternating current civil nature.
Embodiment 3
If a light-emitting diode among Fig. 1 or among Fig. 2 in D1 or the D2 branch has been out of order, the light-emitting diode in this whole branch can be in closed condition so.For fear of this situation, we need increase the anti-fault ability of circuit.In fact, more existing anti-fault abilities of the circuit of Fig. 2 demonstration.One has branched out fault, and a normal branch in addition can work on.Fig. 4 has demonstrated an example that improves anti-fault ability.Each light-emitting diode of demonstrating among Fig. 1 and Fig. 2 is substituted by the unit that a plurality of light emitting diode string among Fig. 4 compose in parallel.Also introduced among Fig. 4 and utilized Zener (Zener) diode to prevent the fault technology.Cause when opening circuit when the parallel light emitting diode that connects of a certain and Zener (Zener) diode ZD is out of order, Zener (Zener) diode will conducting works on other the light emitting diode that is connected in series in the guarantee branch.But whether use Zener (Zener) diode in actual applications, depend on the requirement of concrete application.Diode among Fig. 1 and Fig. 2 in the demonstration also can be made up of to alleviate the influence of single diode damage to entire circuit a plurality of diode connection in series-parallel of demonstration in the image pattern 4.
Embodiment 4
In order to increase anti-fault ability and brightness of illumination, can expand the basic circuit of Fig. 1 and Fig. 2.Fig. 5 has demonstrated such example, parallel connection is carried out in the combination of the led lighting of the positive negative cycle alternation among m Fig. 2 duplicated.The number of the light-emitting diode in each branch, color can be identical or different with characterisitic parameter.Can to be a plurality of diode connection in series-parallel of demonstration are formed in a diode or the image pattern 4 combination damage influence to entire circuit to alleviate single diode with single diode in Fig. 5 demonstration.The unit that single light-emitting diode in Fig. 5 demonstration can be composed in parallel by one group of light emitting diode string of demonstration in single light-emitting diode or the image pattern 4 is formed, and wherein whether uses Zener (Zener) diode, depends on the requirement of concrete application.Resistance R in Fig. 5 demonstration
b, R
1～R
mAnd R
C1～R
CmCan be null value, fixed resistance or variable resistor.R
1～R
2mCan have identical value or different value.R
C1～R
CmCan have identical value or different value.R
b, R
1～R
2mAnd R
C1～R
CmThe combination and variation brightness of illumination and the color that can be used for regulating whole circuit of LED.
Embodiment 5
For the application of some low-power consumption, if the heat radiation of light-emitting diode is not a subject matter, Fig. 6 has demonstrated the directly another kind of execution mode of the light-emitting diode (LED) illuminating circuit of driving of alternating current.In Fig. 6, be parallel with the series circuit of the identical light-emitting diode of the polar orientation of n of m route series connection, m and n can be 1 or arbitrary integer, light-emitting diode is with L
11～Lnm represents.At the parallel circuits two ends, be in series with the two-way polar orientation described diode D1 that play the guiding role identical respectively, D2 with light-emitting diode, D3 and D4, wherein one road diode, the i.e. D1 of an end, wherein one road diode with the other end, be D2, with the corresponding connection of a wherein end of power supply, another road diode of an end, be D4, with another road diode of the other end, i.e. D3 is with the corresponding connection of the other end of power supply.When alternating current enters positive voltage during the half period, electric current flows into light-emitting diode by diode D1 and D3; When alternating current entered negative voltage half-cycle, electric current flowed into light-emitting diode by diode D4 and D2.Each light-emitting diode among Fig. 6 is all in running order in positive voltage half period and negative voltage half-cycle like this.So the device of Fig. 6 demonstration only need be with the light-emitting diode of half number in the device that Fig. 5 demonstrated, but can reach same illumination intensity, can reduce installation cost like this.Can to be a plurality of diode connection in series-parallel of demonstration are formed in a diode or the image pattern 4 combination damage influence to entire circuit to alleviate single diode with single diode in Fig. 6 demonstration.The unit that single light-emitting diode in Fig. 6 demonstration can be composed in parallel by one group of light emitting diode string of demonstration in single light-emitting diode or the image pattern 4 is formed, and wherein whether uses Zener (Zener) diode, depends on the requirement of concrete application.Resistance R among Fig. 6
bAnd R
C1～R
CmCan be null value, fixed resistance or variable resistor.R
C1～R
CmCan have identical value or different value.R
bAnd R
C1～R
CmThe combination and variation brightness of illumination and the color that can be used for regulating whole circuit of LED.
Claims (10)
1, the light emitting diode illuminating apparatus that directly drives of alternating current is characterized in that it comprises the identical light-emitting diode of polar orientation of one or more series connection, and, with the identical diode that shields of polar orientation of light-emitting diode series connection.
2, the light emitting diode illuminating apparatus that directly drives of alternating current as claimed in claim 1, it is characterized in that it comprises the described circuit of two-way claim 1 in parallel, the wherein opposite polarity directions of the diode on one tunnel diode and light-emitting diode and another road and light-emitting diode.
3, the light-emitting diode (LED) illuminating circuit that directly drives of alternating current as claimed in claim 1; the two ends that it is characterized in that the light-emitting diode that the polar orientation of described one or more series connection is identical; or the two ends of several roads aforementioned circuit in parallel; be in series with the two-way polar orientation described diode that shield identical respectively with light-emitting diode; wherein one road diode of one end and wherein one road diode of the other end and power supply wherein an end is corresponding is connected remainder one road diode of an end and the other end corresponding be connected of remainder one road diode of the other end with power supply.
4, the light emitting diode illuminating apparatus that directly drives of alternating current as claimed in claim 2, it is characterized in that it comprise the described circuit of array claim 2 through series connection or/and the combinational circuit that is constituted in parallel.
5, the light emitting diode illuminating apparatus that directly drives of alternating current as claimed in claim 3, it is characterized in that it comprise the described circuit of array claim 3 through series connection or/and the combinational circuit that is constituted in parallel.
6, the light emitting diode illuminating apparatus that directly drives as claim 1,2,3,4 or 5 described alternating currents is characterized in that the light-emitting diode of single light-emitting diode or several series connection is parallel with Zener (Zener) diode.
7, the light emitting diode illuminating apparatus that directly drives as claim 1,2,3,4 or 5 described alternating currents, it is characterized in that described light-emitting diode by the identical series connection of several polar orientation or/and light-emitting diode in parallel replace.
8, the light emitting diode illuminating apparatus that directly drives as claim 1,2,3,4 or 5 described alternating currents, it is characterized in that described diode by the identical series connection of several polar orientation or/and diode connected in parallel replace.
9, the light emitting diode illuminating apparatus that directly drives as claim 1,2,3,4 or 5 described alternating currents is characterized in that it is in series with resistance, and described resistance is that variable resistor or resistance are the fixed resistance of zero or a certain fixed value.
10, the light emitting diode illuminating apparatus that directly drives of alternating current as claimed in claim 1, it is characterized in that it comprises by two kinds of circuit in following three kinds of circuit through series connection or/and in parallel and combinational circuit that constitute at least: number right of way profit requires 1 described circuit, number right of way profit to require 2 described circuit, number right of way profit to require 3 described circuit, wherein, the number of claim 1,2,3 described circuit can be equate or do not wait.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100703775A CN1859821A (en) | 2005-05-08 | 2005-05-08 | Alternative current directly driving light emitting diode lighting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100703775A CN1859821A (en) | 2005-05-08 | 2005-05-08 | Alternative current directly driving light emitting diode lighting device |
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| Publication Number | Publication Date |
|---|---|
| CN1859821A true CN1859821A (en) | 2006-11-08 |
Family
ID=37298668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005100703775A Pending CN1859821A (en) | 2005-05-08 | 2005-05-08 | Alternative current directly driving light emitting diode lighting device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101902856A (en) * | 2010-07-05 | 2010-12-01 | 陆敬仁 | Another method for driving common LED by alternating current |
| CN101980584A (en) * | 2009-05-07 | 2011-02-23 | 亮芯科技股份有限公司 | Bi-direction constant current device and LED lamp employing the same |
| US8405313B2 (en) | 2010-08-03 | 2013-03-26 | Foxsemicon Integrated Technology, Inc. | Light emitting diode lamp |
| CN103052238A (en) * | 2013-01-03 | 2013-04-17 | 常州洪荒谷电子科技有限公司 | Alternating current driven LED (light emitting diode) lamp |
| TWI482929B (en) * | 2010-01-29 | 2015-05-01 | Chih Ming Yu | Strengthen the heat of the LED lights |
| TWI507633B (en) * | 2009-05-08 | 2015-11-11 |
-
2005
- 2005-05-08 CN CNA2005100703775A patent/CN1859821A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101980584A (en) * | 2009-05-07 | 2011-02-23 | 亮芯科技股份有限公司 | Bi-direction constant current device and LED lamp employing the same |
| TWI507633B (en) * | 2009-05-08 | 2015-11-11 | ||
| TWI482929B (en) * | 2010-01-29 | 2015-05-01 | Chih Ming Yu | Strengthen the heat of the LED lights |
| CN101902856A (en) * | 2010-07-05 | 2010-12-01 | 陆敬仁 | Another method for driving common LED by alternating current |
| US8405313B2 (en) | 2010-08-03 | 2013-03-26 | Foxsemicon Integrated Technology, Inc. | Light emitting diode lamp |
| TWI393843B (en) * | 2010-08-03 | 2013-04-21 | Foxsemicon Integrated Tech Inc | Led illumination device |
| CN103052238A (en) * | 2013-01-03 | 2013-04-17 | 常州洪荒谷电子科技有限公司 | Alternating current driven LED (light emitting diode) lamp |
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Open date: 20061108 |