CN201657419U - LED lighting device capable of self-adapting to voltage of power source - Google Patents
LED lighting device capable of self-adapting to voltage of power source Download PDFInfo
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- CN201657419U CN201657419U CN2010201343699U CN201020134369U CN201657419U CN 201657419 U CN201657419 U CN 201657419U CN 2010201343699 U CN2010201343699 U CN 2010201343699U CN 201020134369 U CN201020134369 U CN 201020134369U CN 201657419 U CN201657419 U CN 201657419U
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Abstract
An LED lighting device capable of self-adapting to voltage of a power source adapts to changes of supply voltage by automatically changing serial numbers of LED bulbs, and comprises a constant current source, the LED bulbs connected in series, a plurality of thyristor controlled series LED bulbs, a logic switch circuit and a voltage detection unit, wherein the constant current source, the LED bulbs connected in series and the thyristor controlled series LED bulbs are connected in parallel into the power source, the voltage detection unit is connected in parallel to the power source, an output end of the voltage detection unit is connected with an input end of the logic switch circuit, and output ends of the logic switch circuit are respectively connected with the corresponding thyristor controlled series LED bulbs. When the power voltage rises, the number of the LED lamps is increased. When the power voltage lowers, the number of the LED bulbs is reduced. Therefore, the total number of the bulbs in working can best adapt to current power voltage condition, thereby guaranteeing constancy of LED driving current and also leading a linear constant current circuit to work under the most proper electric environment.
Description
Affiliated technical field
The utility model relates to a kind of LED lighting device, LED lighting device that especially can the adaptation power supply supply voltage.
Background technology
Characteristics such as that the LED lighting device has is energy-conservation, longevity meet national encourage growth green illumination, low-carbon (LC) social requirement, and its product has good market prospects.Yet because the operating characteristic of LED device, will cause that to the minor variations of its power supply very big electric current changes, so the LED device is very responsive to mains ripple, must work under a suitable electrical environment, to guarantee the working life of LED device.All the time, how keeping LED LED illumination device operating current constant is the key technology of its development of a restriction.Consider the unsettled fact of China's line voltage (general voltage ripple of power network is between 180V-250V), the important problem that the LED lighting device will solve is exactly when fluctuation takes place power supply, makes the operating current of LED keep constant.General solution has three kinds, the series resistance constant current at present; Linear constant-current source circuit constant current; The constant current of PWM Switching Power Supply.The constant-current characteristics of series resistance is undesirable, can only be used in the not high occasion of ask for something basically, can not really become the constant current measure of illumination LED light fixture.The constant current of PWM Switching Power Supply scheme is accurate, and the bucking voltage wide ranges can be good at solving the line voltage shakiness and drives the problem of bringing to LED, is the main flow scheme that present LED lamp drives.Many special pwm chips as the LED driving power are arranged both at home and abroad.But this scheme price is higher relatively, also has two deficiencies simultaneously: the one, and the PWM power supply itself is a consumption of electric power, PWM power supply average electrical efficient is 80% at present.Be electromagnetic interference problem in addition, the basic principle of PWM power work is exactly copped wave, and promptly speed-sensitive switch is cut into the changeable pulsating direct current of width with direct voltage, and the high-frequency high-speed pulsation must bring very big electromagnetic interference.Linear constant-current source circuit also has drive current precision preferably, and it needs only the constant-current source that just can constitute a working stability with several transistors and resistance, and price is much lower with respect to the PWM Switching Power Supply.Linear constant-current source circuit belongs to linear power supply, and the pulsation that does not have speed-sensitive switch to produce in the work is not so exist the electromagnetic interference phenomenon substantially.Number of patent application is that basic circuit is exactly the typical scenario of linear constant-current source circuit driving LED in two patents of invention of 02107078.4,02815923.3.Yet when supply power voltage has when changing by a relatively large margin, the voltage increment of variation all will be taken by linear constant-current source circuit, has increased the breakdown danger of constant current tube, and power also increases consumption simultaneously.Therefore this linear constant-current source circuit can only be operated under the little environment of supply power voltage variation.Number of patent application is that 200710193834.9 patent of invention is in order to solve this problem of linear constant-current source circuit, it has adopted the method for PWM Switching Power Supply and linear constant-current source circuit constant current to realize the LED constant-current driving, solve the problem of linear constant current circuit, but existed the intrinsic electromagnetic interference problem of Switching Power Supply also.
Summary of the invention
In order to overcome existing LED lighting device when fluctuation takes place power supply, the operating current of LED can not keep constant deficiency.The invention provides a kind of LED lighting device of adaptation power supply supply voltage, when fluctuation takes place power supply, can change series LED lamp pearl quantity automatically and adapt to change in voltage, make the operating current of LED keep constant.
The invention provides a kind of LED lighting device of adaptation power supply supply voltage, comprise controllable LED lamp pearl and the logic switching circuit and the voltage detection unit of the LED lamp pearl of constant-current source, some series connection, some series connection.The controllable LED lamp pearl series connection of the LED lamp pearl of constant-current source, some series connection and some series connection is connected to power supply, voltage detection unit is connected to power supply, the output of voltage detection unit links to each other with the input of logic switching circuit, and the control switch that each output of logic switching circuit is corresponding with the controllable LED lamp pearl of corresponding some series connection respectively is connected.
Constant-current source is a kind of linear constant-current source, the substantially linear constant-current driving structure that the controllable LED lamp pearl of LED lamp pearl that it is connected with some and some series connection is composed in series.
The LED series circuit is made up of the LED lamp pearl of some series connection and the controllable LED lamp pearl of some series connection.The lamp pearl number of the controllable LED lamp pearl of some series connection is dynamically to change at any time according to the variation of supply power voltage.The lamp pearl sum of participation work is that the lamp pearl of the controllable LED lamp pearl of the LED lamp pearl of some series connection and some the series connection that participate in work is counted sum.
Logic switching circuit is made up of logical circuit and switching circuit, just determines the number of switching circuit that open and closure according to the voltage of power supply, changes the number that the controllable LED lamp pearl of some series connection seals in.
Voltage detection unit is connected to power supply, and voltage detection unit is the voltage detecting circuit that comprises comparison circuit, reference circuit.Transient change by its monitoring power supply voltage.According to detected voltage height, by the action of logic switching circuit driving switch, the number that the controllable LED lamp pearl of some series connection of control seals in.
The controllable LED lamp pearl of some series connection can be replaced by the resistance of some controlled series.
The controllable LED lamp pearl of the LED lamp pearl of some series connection or some series connection is at least a LED lamp pearl.
The present invention has adopted a kind of lamp pearl series connection number that can automatically change to adapt to the LED lamp driving method that supply power voltage changes on basic constant-current driving architecture basics.Mainly solved owing to supply power voltage changes and caused that LED drives the problem that the additional change in voltage of constant-current source causes.When supply power voltage raises, increase the lamp pearl number of the controllable LED lamp pearl of some series connection, when supply power voltage reduces, reduce the lamp pearl number of the controllable LED lamp pearl of some series connection.The current supply power voltage situation of adaptation that the lamp pearl of participation work sum just can be best can guarantee the constant of LED drive current like this, and linear constant current circuit is operated under the only electrical environment.
Description of drawings
Fig. 1 is the principle schematic of the embodiment of the invention.
Fig. 2 is the circuit diagram of another embodiment of the present invention.
Fig. 3 is the circuit diagram of another embodiment of the present invention.
Fig. 4 is the circuit diagram of another embodiment of the present invention.
Among the figure: 1. constant-current source, 2. the LED lamp pearl of some series connection, 3. the controllable LED lamp pearl of some series connection, 4. logic switching circuit, 5. voltage detection unit.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.Referring to Fig. 1, the present invention is provided with the LED lamp pearl 2 of constant-current source 1, some series connection, the controllable LED lamp pearl 3 of some series connection, logic switching circuit 4, voltage detection unit 5.
Constant-current source 1 is a kind of linear constant-current source, and it can be made up of linear elements such as transistor, field effect transistor.The controllable LED lamp pearl 3 of the LED lamp pearl 2 that it is connected with some, some series connection is formed series circuit.Constant-current source carries out the constant current power supply to LED lamp pearl, guarantees the stable of LED operating current.
The controllable LED lamp pearl 3 of the LED lamp pearl 2 of some series connection, some series connection is formed series circuit.The LED lamp pearl 2 of some series connection is as basic normal alight pearl.By the lamp pearl number of the controllable LED lamp pearl 3 of some series connection of logic switching circuit control is dynamically to change at any time according to the variation of supply power voltage.The lamp pearl sum of participation work is that the lamp pearl of the LED lamp pearl 2 of some the series connection controllable LED lamp pearl 3 of connecting with some participation work is counted sum.
Logic switching circuit 4 is by logical circuit and logic switch K1 ... Km forms, and determines logic switch K1 according to the height of detected power supply voltage ... the unlatching of Km and closure, the number that the controllable LED lamp pearl 3 lamp pearls of some series connection of change seal in.
Determine logic switch K1 as required ... the switch number of Km, each switch can parallel way insert the controllable LED lamp pearl 3 of some corresponding series connection.When switch closure, then Dui Ying lamp integument short circuit.When switch was opened a way, then Dui Ying lamp pearl seals in the loop, and was normally luminous.
Fig. 2 is logic switch K1 of the present invention ... the another kind of method of attachment of Km.The controllable LED lamp pearl 3 corresponding lamp pearls of one end of every group of switch and some series connection connect, and the other end then is directly connected to the negative terminal of power supply.When some switch closures, the LED lamp pearl of the following serial connection of the LED lamp pearl of corresponding this switch and this lamp pearl is all by short circuit.When some switch opens, then corresponding lamp pearl seals in the loop, and is normally luminous.
Referring to Fig. 3, present embodiment adopts resistance to replace the controllable LED lamp pearl 3 of corresponding some series connection.
Referring to Fig. 4, present embodiment adopts resistance to replace the controllable LED lamp pearl 3 and the logic dynamic switch of corresponding some series connection to connect power supply negative terminal, can play bear the effect that supply power voltage increase identical with LED lamp pearl equally.
Claims (6)
1. the LED lighting device of an adaptation power supply supply voltage, it is characterized in that: the controllable LED lamp pearl and logic switching circuit and the voltage detection unit that comprise the LED lamp pearl of constant-current source, some series connection, some series connection, the controllable LED lamp pearl series connection of the LED lamp pearl of constant-current source, some series connection and some series connection is connected to power supply, voltage detection unit is connected to power supply, the output of voltage detection unit links to each other with the input of logic switching circuit, and each output of logic switching circuit is connected with the controllable LED lamp pearl of corresponding some series connection respectively.
2. the LED lighting device of a kind of adaptation power supply supply voltage according to claim 1 is characterized in that: described constant-current source is a kind of linear constant-current source, and it can be made up of linear elements such as transistor, field effect transistor.
3. the LED lighting device of a kind of adaptation power supply supply voltage according to claim 1 is characterized in that: described controllable LED lamp pearl be a kind of can be by the LED lamp group of short circuit, it can be made of the LED lamp pearl that is at least electronic switch in parallel.
4. the LED lighting device of a kind of adaptation power supply supply voltage according to claim 1 is characterized in that: described controllable LED lamp pearl can replace with controllable resistor, and controllable resistor is made of the resistance that is at least one electronic switch in parallel.
5. the LED lighting device of a kind of adaptation power supply supply voltage according to claim 1 is characterized in that: the output of described logic switching circuit is connected with each controllable LED lamp pearl of the controllable LED lamp pearl of some series connection respectively.
6. according to claim 1 or 3 or the LED lighting device of described a kind of adaptation power supply supply voltage, it is characterized in that: described electronic switch in parallel is to be used for short circuit LED lamp pearl, its connection also can a termination LED lamp pearl, another termination potential minimum or maximum potential.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201343699U CN201657419U (en) | 2010-03-12 | 2010-03-12 | LED lighting device capable of self-adapting to voltage of power source |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010201343699U CN201657419U (en) | 2010-03-12 | 2010-03-12 | LED lighting device capable of self-adapting to voltage of power source |
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| CN201657419U true CN201657419U (en) | 2010-11-24 |
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| CN2010201343699U Expired - Fee Related CN201657419U (en) | 2010-03-12 | 2010-03-12 | LED lighting device capable of self-adapting to voltage of power source |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101772245A (en) * | 2010-03-12 | 2010-07-07 | 陈林 | LED lighting device capable of automatically adapting to power supply voltage |
| CN102665353A (en) * | 2012-05-17 | 2012-09-12 | 张从峰 | Double-switch constant-current driver |
| CN103281840A (en) * | 2013-06-09 | 2013-09-04 | 中国科学院半导体研究所 | LED drive circuit with high-power coefficient |
| CN103428959A (en) * | 2012-05-16 | 2013-12-04 | 理查德·兰德里·格雷 | Device and method for driving an LED light |
| CN103458551A (en) * | 2012-05-28 | 2013-12-18 | 冯向光 | Switch LED drive circuit and LED lighting system |
| CN103702483A (en) * | 2013-12-20 | 2014-04-02 | 绍兴恒力特微电子有限公司 | High efficiency linear topology structure LED (Light Emitting Diode) driving circuit |
| CN104009621A (en) * | 2013-02-24 | 2014-08-27 | 理察·蓝德立·葛瑞 | Device for improving power efficiency for power factor corrections |
| CN107949105A (en) * | 2017-11-21 | 2018-04-20 | 深圳市明微电子股份有限公司 | Constant current driver circuit for LED and lamps and lanterns |
| US10342089B1 (en) | 2018-09-03 | 2019-07-02 | Chicony Power Technology Co., Ltd. | Constant current device and heat dispersion module thereof |
-
2010
- 2010-03-12 CN CN2010201343699U patent/CN201657419U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101772245A (en) * | 2010-03-12 | 2010-07-07 | 陈林 | LED lighting device capable of automatically adapting to power supply voltage |
| CN103428959A (en) * | 2012-05-16 | 2013-12-04 | 理查德·兰德里·格雷 | Device and method for driving an LED light |
| CN103428959B (en) * | 2012-05-16 | 2016-09-28 | 北京埃菲莱光电科技有限公司 | Drive parts and the method thereof of LED lamp |
| CN102665353A (en) * | 2012-05-17 | 2012-09-12 | 张从峰 | Double-switch constant-current driver |
| CN103458551A (en) * | 2012-05-28 | 2013-12-18 | 冯向光 | Switch LED drive circuit and LED lighting system |
| CN104009621A (en) * | 2013-02-24 | 2014-08-27 | 理察·蓝德立·葛瑞 | Device for improving power efficiency for power factor corrections |
| CN103281840A (en) * | 2013-06-09 | 2013-09-04 | 中国科学院半导体研究所 | LED drive circuit with high-power coefficient |
| CN103281840B (en) * | 2013-06-09 | 2016-02-17 | 中国科学院半导体研究所 | The LED drive circuit of High Power Factor |
| CN103702483A (en) * | 2013-12-20 | 2014-04-02 | 绍兴恒力特微电子有限公司 | High efficiency linear topology structure LED (Light Emitting Diode) driving circuit |
| CN107949105A (en) * | 2017-11-21 | 2018-04-20 | 深圳市明微电子股份有限公司 | Constant current driver circuit for LED and lamps and lanterns |
| US10342089B1 (en) | 2018-09-03 | 2019-07-02 | Chicony Power Technology Co., Ltd. | Constant current device and heat dispersion module thereof |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101124 Termination date: 20120312 |