CN103188845A - Light emitting diode (LED) light-emitting device directly driven by alternating current - Google Patents
Light emitting diode (LED) light-emitting device directly driven by alternating current Download PDFInfo
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- CN103188845A CN103188845A CN2011104578430A CN201110457843A CN103188845A CN 103188845 A CN103188845 A CN 103188845A CN 2011104578430 A CN2011104578430 A CN 2011104578430A CN 201110457843 A CN201110457843 A CN 201110457843A CN 103188845 A CN103188845 A CN 103188845A
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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
- H05B45/37—Converter circuits
Abstract
The invention relates to an alternating current direct driving technology of a light emitting diode (LED) light-emitting device. Specific to the defects of light emitting flicker caused by directly driving an LED light-emitting device by alternating current in the prior art, the invention discloses an LED light-emitting device directly driven by alternating current. An LED light-emitting device circuit is composed of n levels of LED modules in cascade connection, a sampling unit is used for properly presetting turn-off and switch-on voltages of each level of LED modules corresponding to a switch unit, and therefore flicker phenomenon caused in the process of alternating voltage fluctuation can be avoided. Increasing the number of the LED modules is equivalent to reducing break-over voltages of each level of LED modules, and a utilization rate of a power supply is improved. In the process of applying a plurality of levels of LED modules, when alternating voltages fluctuate, the effect of each LED module is smaller compared with the effect of applying a single module, working stability of an LED is better and reliable, and the capacity of alternating voltage fluctuation resistance is stronger.
Description
Technical field
The present invention relates to LED (light-emitting diode) light-emitting device, particularly the alternating current direct driving technologies of LED light-emitting device.
Background technology
LED is expected to become lighting source of new generation as a kind of novel solid state light emitter with advantages such as its energy-saving and environmental protection, life-span length.As everyone knows, existing LED uses dc powered, and our productive life electricity consumption is alternating current.Therefore, in the LED product that uses at present, need a power supply changeover device, alternating current is converted to direct current.The introducing of power supply changeover device brings a lot of negative effects.One, the life-span of power supply changeover device makes shorten the useful life of lighting device well below the life-span of LED self; Its two, power supply changeover device can reduce the efficient of light-emitting device; Its three, in low-power applications, power supply changeover device can cause the decline of power factor and the increase of electric current total harmonic distortion.In order to give full play to the advantage of semiconductor lighting, can become current research focus with the LED light-emitting device that alternating current directly drives.
In existing AC LED public technology, be to use the plurality of LEDs assembly to be formed by connecting according to the circuit topological structure of reverse parallel connection or bridge rectifier mostly, to satisfy the driving requirement of alternating electromotive force.But alternating current is according to certain frequency period fluctuation, because the existence of LED self cut-in voltage, when instantaneous voltage surpassed cut-in voltage, LED just understood conducting and luminous.Otherwise LED is by non-luminous.Sort circuit makes that the luminous efficiency of LED is very low, and along with the light-emitting flash phenomenon appears in the alternating voltage fluctuation.
Among the international monopoly WO 2004/023568A1 " LIGHT-EMITTING DEVICE HAVING LIGHT-EMITTING ELEMENTS ", integrated LED chip array on Sapphire Substrate has been proposed, thereby a kind of alternating electromotive force driven light emitting device is provided, but does not solve the light-emitting flash problem of LED.
US Patent No. 7,489,086B2 " AC LIGHT EITTING DIODE AND AC LED DRIVE METHODS AND APPARATUS " provide a kind of AC LED device, this invention is a kind of with the integrated packaged device of a plurality of LED, utilizes the visual persistence effect of human eye to remedy the LED light-emitting flash phenomenon that alternating current causes.This patent does not fundamentally solve the light-emitting flash phenomenon that the alternating voltage cyclic fluctuation causes.
As seen, in disclosing LED interchange Driving technique, all exist the drive current of shortcoming a: LED to fluctuate along with the fluctuation of alternating voltage, occur brightness when causing LED luminous and change, produce the phenomenon of light-emitting flash.Simultaneously, the core of LED device is a PN junction diode, and its I-V characteristic is approximate exponential function, and after the voltage at LED two ends was greater than cut-in voltage, the electric current that flows through PN junction was exponential increase.The AC driving method of prior art when the unexpected rising of alternating voltage, may directly damage the LED device.
Summary of the invention
Technical problem to be solved by this invention, the shortcoming of the light-emitting flash that causes at the direct driving LED light-emitting device of prior art alternating current exactly, the LED light-emitting device that provides a kind of alternating current directly to drive, overcome the LED scintillation that alternating current causes, and the efficient of raising LED light-emitting device, the useful life of prolongation LED.
The present invention solve the technical problem, the technical scheme that adopts is, the LED light-emitting device that alternating current directly drives, comprise ac input end, protected location and rectification unit, it is characterized in that, first output of described rectification unit is connected to second output by n LED module and a switch element, n 〉=1 wherein, and be integer; When n 〉=2, the passage that also has switch element to constitute between per two LED modules is connected with second output, and each switch element all is connected with sampling unit;
Described ac input end is used for connecting alternating current, for device provides operating current;
Described protected location is connected with ac input end, for device provides defencive function;
Described rectification unit is connected with protected location, and the alternating current that protected location is exported carries out rectification;
Described sampling unit is used for the output voltage of rectification unit is sampled, and outputs a control signal to each switch element;
Described switch element is connected with sampling unit, turn-offs or connects according to the control signal of sampling unit output.
LED light-emitting device circuit of the present invention is made of the cascade of n level LED module, suitably presets the shutoff of the corresponding switch element of each grade LED module and connects voltage by sampling unit, occurs scintillation when can avoid the alternating voltage fluctuation.Increase the quantity of LED module, be equivalent to reduce the conducting voltage of each grade LED module, improved the utilance of power supply.When the multi-stage LED module was used, when alternating voltage fluctuateed, the influence that each LED module is subjected to adopted the influence of single module littler relatively, and the stability of LED work is also better, more reliable, and the ability of anti-alternating voltage fluctuation is stronger.
Concrete, described n LED module is made up of led array.
Adopt led array can form the high-power LED module.
Further, described led array is made of 1 LED that is arranged on the same printed circuit board at least; Perhaps integrated at least 1 LED that is encapsulated on the same substrate constitutes; Perhaps be integrated in at least 1 LED on the semi-conductive substrate and constitute.
LED all in the LED module is arranged on the same printed circuit board, is the simplest most economical method for packing under the state-of-the-art; Perhaps be encapsulated on the same substrate LED all in the LED module is integrated, be about to that all LED carry out the secondary encapsulation in the LED module, be integrated on the same heat-radiating substrate; Perhaps be integrated in on the semi-conductive substrate, this is to adopt semiconductor integrated circuit technique, realizes that at same semiconductor chip LED's is integrated.These technology can also improve the uniformity of illuminating device luminous brightness with the LED interlaced arrangement in each LED module, and are conducive to overcome scintillation, and LED encapsulation wiring is also more convenient.
Concrete, described LED is in parallel and/or be connected in series.
The suitable connection combination of LED as parallel connection, series connection or series-parallel connection etc., more can adapt to the environment for use that alternating current directly drives in the LED module, adjusts electric current, the voltage parameter of each LED module easily.
Concrete, described protected location comprises fuse and/or piezo-resistance, and described fuse is connected on ac input end, and described piezo-resistance is connected in parallel on ac input end.
Fuse is the current-limiting protection element of using always, and piezo-resistance then is the voltage-limiting protection element of using always, and their combination can be finished the most basic current limliting and voltage-limiting protection, and cost is low, and is easy for installation, and it is integrated to be convenient to carry out secondary.
Further, described protected location also comprises common mode choke and/or gas discharge tube, and described common mode choke is connected on ac input end, and described gas discharge tube is connected in parallel on ac input end.
Common mode choke can suppress common mode disturbances, and gas discharge tube can protect lighting device not by injuries such as thunders and lightnings.
Concrete, full-wave rectification or half-wave rectifying circuit that described rectification unit is made up of rectifier diode constitute.
Adopt rectifier diode as rectifier cell, volume is little in light weight, is convenient to the integrated encapsulation of secondary.
Concrete, described sampling unit is made of resistor network.
Resistor network is fit to gather dc parameter very much, is convenient to configuration switch unit operating point.
Concrete, described switch element is made of transistor, and the described transistor controls utmost point is connected with sampling unit.
Transistor has control easily as switch element, and is contactless, feature of long life.
More specifically, described transistor is field-effect transistor or bipolar transistor, and described control is the grid of field-effect transistor or the base stage of bipolar transistor very.
The transistor switch element, technology maturation is quick on the draw, reliable in action.
The invention has the beneficial effects as follows that use the direct driving LED module of alternating electromotive force, circuit is simple, volume is little, in light weight, and cost is low.By presetting suitable shutoff voltage, realize that the direct driving LED device of alternating electromotive force can not glimmer in the alternating voltage fluctuation.And when the alternating current instantaneous voltage was too high, switch element turn-offed, and the LED module is not luminous, has improved the utilization ratio of power supply, has reduced power consumption.Simultaneously, the situation of also avoiding the LED module to burn because electric current is excessive has prolonged the useful life of installing.
Description of drawings
Fig. 1 is the structured flowchart of embodiment 1;
Fig. 2 is the circuit theory diagrams of embodiment 1;
Fig. 3 is the structured flowchart of embodiment 2;
Fig. 4 is the structured flowchart of embodiment 3;
Fig. 5 is the circuit theory diagrams of embodiment 3.
Embodiment
Below in conjunction with drawings and Examples, describe technical scheme of the present invention in detail.
The LED light-emitting device that alternating current of the present invention directly drives comprises ac input end, protected location, rectification unit, sampling unit, switch element and n LED module, n 〉=1 wherein, and be integer.In the light-emitting device of the present invention, first output of rectification unit (being generally the direct current output plus terminal) is connected to second output (direct current output negative terminal) by n LED module and a switch element.When LED module quantity surpassed 2, the passage that also has switch element to constitute between per two LED modules was connected with second output.Each switch element all is connected with sampling unit, controlled by it.LED light-emitting device circuit of the present invention is made of the cascade of n level LED module, suitably presets the shutoff of the corresponding switch element of each grade LED module and connects voltage by sampling unit, occurs scintillation when can avoid the alternating voltage fluctuation.Increase the quantity of LED module, be equivalent to reduce the conducting voltage of each grade LED module, improved the utilance of power supply.When the multi-stage LED module was used, when alternating voltage fluctuateed, the influence that each LED module is subjected to adopted the influence of single module littler relatively, and the stability of LED work is also better, more reliable, and the ability of anti-alternating voltage fluctuation is stronger.
Embodiment 1
Referring to Fig. 1 and Fig. 2, this routine light-emitting device comprises ac input end 1, protected location 2, rectification unit 3, sampling unit 4, switch element 6 and LED module 5, and the quantity of this routine LED module 5 is 1 (being n=1).First output of this routine rectification unit is direct current output plus terminal 31, and this anode 31 is connected to second output direct current output negative terminal 32 by LED module 5 switch elements 6.Referring to Fig. 1.Ac input end 1 is connected with N end (zero line) with alternating current L end (phase line), and alternating current is introduced protected location 2.2 pairs of whole devices of protected location provide basic defencive function, are made of piezo-resistance VR and fuse F, and fuse F is connected on the phase line, and piezo-resistance is connected in parallel between phase line and the zero line, sees Fig. 2.For being applied to particular surroundings, protected location 2 also can comprise common mode choke and gas discharge tube.Common mode choke is connected on phase line and the zero line, and gas discharge tube generally is connected in parallel between phase line and the zero line.This routine rectification unit 3 is made up of the full-wave rectifying circuit D that rectifier diode constitutes, and alternating current is carried out full-wave rectification.This routine voltage sample unit 4, the resistor network of being made up of sampling resistor R1 and R2 constitutes, by the direct voltage of sampling rectification circuit D output, control switch unit 6.As shown in Figure 2.This routine switch element 6 is by MOSFET (mos field effect transistor is called for short field effect transistor) M1 and M2 and voltage stabilizing didoe DZ1, DZ2, resistance R 3, R4 and R5 formation.This routine LED module 5 is made of the array that the LED of many series, parallel or series-parallel connection forms, can be a plurality of LED that are arranged on the same printed circuit board, perhaps integrated a plurality of LED that are encapsulated on the same heat-radiating substrate, or be integrated in the integrated circuit that constitutes with a plurality of LED on the semi-conductive substrate.
When the instantaneous voltage of alternating current reaches the cut-in voltage of LED module 5, switch element 6 conducting under the driving of sampling unit 4,5 beginnings of LED module are luminous; When the instantaneous voltage of alternating current surpassed default shutoff voltage, switch element 6 turn-offed, and LED module 5 stops luminous; When fluctuation appearred in alternating current, in normal operating voltage range, in the time of namely between the cut-in voltage of LED module 5 and default shutoff voltage, what change was the time point of the turn-on and turn-off of switch element 6, and the luminous of LED module 5 can not glimmered.
As shown in Figure 2, an end of rectification circuit D output plus terminal and resistance R 1 is connected, and is connected to the anode of LED module simultaneously, and the output negative terminal of rectification circuit D is as ground.The other end of resistance R 1 is connected with an end of resistance R 2, the negative terminal of voltage stabilizing didoe DZ1, an end of resistance R 3; The other end of resistance R 3 is connected with the grid of field effect transistor M1, and the negative terminal of an end of the drain electrode of field effect transistor M1, resistance R 4, an end of resistance R 5, voltage stabilizing didoe DZ2 connects.The other end of resistance R 5 is connected with the grid of field effect transistor M2, and the other end of the drain electrode of field effect transistor M2, resistance R 4, the negative terminal of LED module connect.The source electrode of the anode of the anode of the other end of resistance R 2, voltage-stabiliser tube DZ1, voltage-stabiliser tube DZ2, the source electrode of field effect transistor M1, field effect transistor M2 is connected to ground (direct current output negative terminal).
When ac input end 1 is connected with electrical network, this lighting device obtains alternating electromotive force, through protected location 2, and by rectification unit 3, is rectified into direct current, offers sampling unit 4, switch element 6 and LED module 5.In each ac cycle, the rising of starting from scratch of rectification circuit D output voltage, when voltage was elevated to the cut-in voltage of switch element, field effect transistor M1 turn-offed, the M2 conducting, 5 beginnings of LED module are luminous; The electric current that passes through along with input voltage rising LED module increases, and is lower than the default shutoff voltage stage at voltage, and the undertension of sampling unit 4 outputs is so that field effect transistor M1 conducting, and M1 keeps turn-offing, and M2 keeps conducting, and LED module 5 is lasting luminous; Raise when voltage is unexpected, when surpassing default shutoff voltage, M1 begins conducting, and M2 turn-offs, and the LED module is not luminous, and protection LED module 5 is avoided the impact of big electric current.
Embodiment 2
As shown in Figure 3, this routine light-emitting device LED module 5 has 2, switch element 6 also is 2, rectification unit 3 anodes 31 (are labeled as switch element 2 by 2 LED modules and the 2nd switch element 6 among the figure, other switch element marks are similarly) be connected with rectification unit 3 negative terminals 32, between the 1st LED module 5 and the 2nd LED module 5, there is the passage of the 1st switch element 6 formations to be connected with rectification unit 3 negative terminals 32.All switch elements 6 of this example all are connected with sampling unit 4.
As shown in Figure 4, this routine light-emitting device LED module 5 has 3, switch element 6 also is 3, rectification unit 3 anodes 31 are connected with rectification unit 3 negative terminals 32 with the 3rd switch element 6 by 3 LED modules, between the 1st LED module 5 (be labeled as LED module 1 among the figure, other LED module marks similarly) and the 2nd LED module 5, there is the passage of the 1st switch element 6 formations to be connected with rectification unit 3 negative terminals 32.Between the 2nd LED module 5 and the 3rd LED module 5, also have the passage of the 2nd switch element 6 formations to be connected with rectification unit 3 negative terminals 32.All switch elements 6 of this example all are connected with sampling unit 4.
The circuit theory diagrams of this routine device as shown in Figure 5, its operation principle and particular circuit configurations are similar to Example 1, are not giving unnecessary details herein.This routine sampling unit 4 is by resistance R 1, R2; R6, R7; R11, R12 constitute; three switch elements 6; with 5 one-tenth three grades of circuit of 3 LED module groups; three switch elements 6 are controlled three LED modules respectively, by sampling unit 4 turn-off time of each grade switch are set respectively, and corresponding LED module 5 is protected.Along with the increase of LED module quantity, be equivalent to reduce the conducting voltage of each LED module, improved the utilance of power supply.When the multi-stage LED module was used, when alternating voltage fluctuateed, the influence that each LED module is subjected to adopted the influence of single module littler relatively, and the stability of LED work is also better, more reliable, and the ability of anti-alternating voltage fluctuation is stronger.
Through above-mentioned detailed explaination, as can be seen, voltage sample of the present invention unit monitoring input voltage also has the defencive function to the LED module simultaneously.When big fluctuation appearred in alternating voltage, switch element also can in time disconnect, and protection LED module does not damage because electric current is excessive.
Need to prove: though above-described embodiment has been described structure of the present invention in detail, the present invention is not limited to above-described embodiment, and the replacement structure of the routine that every those skilled in the art carry out according to foregoing description all belongs to protection scope of the present invention.
Claims (10)
1. the LED light-emitting device that directly drives of alternating current, comprise ac input end, protected location and rectification unit, it is characterized in that first output of described rectification unit is connected to second output by n LED module and a switch element, n 〉=1 wherein, and be integer; When n 〉=2, the passage that also has switch element to constitute between per two LED modules is connected with second output, and each switch element all is connected with sampling unit;
Described ac input end is used for connecting alternating current, for device provides operating current;
Described protected location is connected with ac input end, for device provides defencive function;
Described rectification unit is connected with protected location, and the alternating current that protected location is exported carries out rectification;
Described sampling unit is used for the output voltage of rectification unit is sampled, and outputs a control signal to each switch element;
Described switch element is connected with sampling unit, turn-offs or connects according to the control signal of sampling unit output.
2. the LED light-emitting device that directly drives of alternating current according to claim 1 is characterized in that described n LED module is made up of led array.
3. the LED light-emitting device that directly drives of alternating current according to claim 2 is characterized in that described led array is made of 1 LED that is arranged on the same printed circuit board at least; Perhaps integrated at least 1 LED that is encapsulated on the same substrate constitutes; Perhaps be integrated in at least 1 LED on the semi-conductive substrate and constitute.
4. the LED light-emitting device that directly drives of alternating current according to claim 3 is characterized in that, described LED is in parallel and/or be connected in series.
5. the LED light-emitting device that directly drives of alternating current according to claim 1 is characterized in that described protected location comprises fuse and/or piezo-resistance, and described fuse is connected on ac input end, and described piezo-resistance is connected in parallel on ac input end.
6. the LED light-emitting device that directly drives of alternating current according to claim 5; it is characterized in that; described protected location also comprises common mode choke and/or gas discharge tube, and described common mode choke is connected on ac input end, and described gas discharge tube is connected in parallel on ac input end.
7. the LED light-emitting device that directly drives of alternating current according to claim 1 is characterized in that full-wave rectification or half-wave rectifying circuit that described rectification unit is made up of rectifier diode constitute.
8. the LED light-emitting device that directly drives of alternating current according to claim 1 is characterized in that described sampling unit is made of resistor network.
9. the LED light-emitting device that directly drives of alternating current according to claim 1 is characterized in that described switch element is made of transistor, and the described transistor controls utmost point is connected with sampling unit.
10. the LED light-emitting device that directly drives of alternating current according to claim 9 is characterized in that described transistor is field-effect transistor or bipolar transistor, and described control is the grid of field-effect transistor or the base stage of bipolar transistor very.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510353228.3A CN104918387B (en) | 2011-12-31 | 2011-12-31 | A kind of LED light device of exchange driving |
| CN201110457843.0A CN103188845B (en) | 2011-12-31 | 2011-12-31 | The LED light emission device of alternating current Direct driver |
| PCT/CN2012/087382 WO2013097692A1 (en) | 2011-12-31 | 2012-12-25 | Alternating current direct drive led light-emitting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110457843.0A CN103188845B (en) | 2011-12-31 | 2011-12-31 | The LED light emission device of alternating current Direct driver |
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| CN201510353228.3A Division CN104918387B (en) | 2011-12-31 | 2011-12-31 | A kind of LED light device of exchange driving |
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| CN103188845A true CN103188845A (en) | 2013-07-03 |
| CN103188845B CN103188845B (en) | 2015-08-05 |
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| CN201110457843.0A Active CN103188845B (en) | 2011-12-31 | 2011-12-31 | The LED light emission device of alternating current Direct driver |
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| CN102892238A (en) * | 2012-10-30 | 2013-01-23 | 四川新力光源股份有限公司 | Dimming drive circuit of AC (Alternating Current) direct drive LED module |
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| WO2015024529A1 (en) * | 2013-08-23 | 2015-02-26 | 四川新力光源股份有限公司 | Led ac drive circuit |
| CN104936330A (en) * | 2014-03-18 | 2015-09-23 | 赵依军 | LED driving power supply and LED illuminating device comprising the same |
| CN104936330B (en) * | 2014-03-18 | 2020-05-19 | 赵依军 | LED driving power supply and LED lighting device comprising same |
| CN104519645A (en) * | 2014-11-27 | 2015-04-15 | 上海航空电器有限公司 | PWM (pulse-width modulation) dimming based light guide plate driving circuit |
| CN104519645B (en) * | 2014-11-27 | 2019-01-08 | 上海航空电器有限公司 | A kind of guide-lighting drive circuit based on PWM light modulation |
| CN104582137A (en) * | 2014-11-28 | 2015-04-29 | 上海航空电器有限公司 | Multistage dimming circuit providing three types of warning signals |
| CN104582137B (en) * | 2014-11-28 | 2019-01-04 | 上海航空电器有限公司 | The multi-level dimming circuit of three kinds of alarm signals |
| CN108391338A (en) * | 2017-02-03 | 2018-08-10 | 半导体元件工业有限责任公司 | The direct AC drive control devices integrated circuit of light emitting diode |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103188845B (en) | 2015-08-05 |
| CN104918387B (en) | 2019-02-12 |
| CN104918387A (en) | 2015-09-16 |
| WO2013097692A1 (en) | 2013-07-04 |
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Denomination of invention: Light emitting diode (LED) light-emitting device directly driven by alternating current Effective date of registration: 20181212 Granted publication date: 20150805 Pledgee: Sichuan energy investment Refco Group Ltd Pledgor: Sichuan Sunfor Light Co., Ltd. Registration number: 2018510000135 |