CN102843818A - Residual light circuit of light-emitting diode - Google Patents
Residual light circuit of light-emitting diode Download PDFInfo
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- CN102843818A CN102843818A CN2012100429342A CN201210042934A CN102843818A CN 102843818 A CN102843818 A CN 102843818A CN 2012100429342 A CN2012100429342 A CN 2012100429342A CN 201210042934 A CN201210042934 A CN 201210042934A CN 102843818 A CN102843818 A CN 102843818A
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- 239000003990 capacitor Substances 0.000 claims abstract description 33
- 230000003287 optical effect Effects 0.000 claims description 33
- 238000010586 diagram Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005669 field effect Effects 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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- Y02B20/346—
Abstract
The LED residual light circuit is connected to a LED lamp string which is connected to the output end of a switching power converter, and is characterized by comprising a diode, a capacitor, a Zener diode, a resistor and an LED residual light lamp string. The diode is connected to the LED string through the anode, the capacitor is connected with the cathode of the diode, the Zener diode is connected with the cathode of the diode and is connected with the capacitor in parallel, the resistor is connected with the cathode of the diode and is connected with the Zener diode in parallel, and the LED residual light string is connected with the resistor in series. Therefore, after the output end of the switching type power converter closes the power supply of the LED lamp string, the LED residual light lamp string of the residual light circuit can still provide residual light for several seconds to several minutes so as to illuminate the space outline and bring convenience for a user to leave the original space.
Description
Technical field
The present invention relates to a kind of circuit, refer to a kind of residual optical circuit that is applied to led lamp especially.
Background technology
In recent years; Flourish along with semiconductor science and technology, and light-emitting diode (Light Emitting Diode, manufacturing technology LED) also reaches its maturity; Present light-emitting diode has been enough to use as the light source of illumination; Power saving, volume are little because light-emitting diode possesses, long service life, stable height, residual optical activity is low and height is lit a lamp characteristic such as replys, and therefore, develops the lumination of light emitting diode module that to be enough to replace fluorescent tube at present; More market is accepted, even the trend that replaces conventional bulb or fluorescent tube has been arranged.
For example in TaiWan, China utility model patent M380425 number; A kind of LED lighting device is promptly proposed; Through combining loam cake, bottom and Bian Gai, do not influencing the technique effect that the illumination prerequisite is issued to the protective that improves the LED light emitting module, and then replacing conventional bulb or fluorescent tube.
Yet light-emitting diode is owing to residual optical activity on characteristic is low, in case be applied to lighting device; After light extinguishes because moment complete dull thread can lighting environment, cause environment too dark; Human eye can't the identification environment in the short time, if carry out activity at this moment, is very easy to cause unexpected generation; Therefore the inconvenience that still has the misgivings on the safety and use is so there is necessity of improvement.
Summary of the invention
Main purpose of the present invention is to solve the known luminescence diode illuminating device, and effective residual light can't be provided, and causes the problem of the misgivings on the inconvenient and safety in the use.
Know via above; For reaching above-mentioned purpose; The present invention provides a kind of residual optical circuit of light-emitting diode; The residual optical circuit of this light-emitting diode is connected to a LED light string, and this LED light string is connected to the output of a switching power converter, and the residual optical circuit of this light-emitting diode is characterised in that and includes a diode, a capacitor, a Zener diode, a resistor and the residual light modulation string of a light-emitting diode.This diode is connected to this LED light string through anode; This capacitor is connected with the negative electrode of this diode; This Zener diode is connected with the negative electrode of this diode, and this Zener diode is parallelly connected with this capacitor again, and this resistor is connected with the negative electrode of this diode; And this resistor is parallelly connected with this Zener diode again, and the residual light modulation string of this light-emitting diode and this resistor in series.
Through technique scheme, the present invention has advantage at least:
One, after the output of this switching power converter is closed the power supply of this LED light string; The present invention still can provide several seconds to several minutes residual light by the residual light modulation string of the light-emitting diode of this residual optical circuit; With the lighting space profile, make things convenient for the user to leave former having living space.
Two, the residual optical circuit formed by the residual light modulation string of this diode, this capacitor, this Zener diode, this resistor and this light-emitting diode of the present invention, the demand that has simple structure, cost is low and meets the light-emitting diode constant-current circuit.
Description of drawings
Fig. 1 is the circuit diagram of first embodiment of the invention.
Fig. 2 is the circuit diagram of second embodiment of the invention.
Fig. 3 is the circuit diagram of third embodiment of the invention.
Fig. 4 is the circuit diagram of fourth embodiment of the invention.
Fig. 5 is the circuit diagram of fifth embodiment of the invention.
Fig. 6 is the circuit diagram of sixth embodiment of the invention.
Fig. 7 is the circuit diagram of seventh embodiment of the invention.
Fig. 8 is the circuit diagram of eighth embodiment of the invention.
Fig. 9 is the circuit diagram of nineth embodiment of the invention.
Embodiment
The objective of the invention is to solve general led lamp after extinguishing,, cause environment too dark because dull thread can lighting environment; Human eye can't the identification environment; Be easy to generate accident, so residual light of the present invention can be assisted human eye, in several seconds time with a few minutes; Pick out correct direction, promote the sense of security.
Exploitation and application along with led lamp; The present invention proposes the residual optical circuit 120 of light-emitting diode, and is as shown in Figure 1, in first embodiment; The output of switching power converter 101 is connected to LED light string 102; LED light string 102 is connected to the anode of diode 103, and the negative electrode of diode 103 is connected to capacitor 104, again the negative electrode of parallel diode (Zener diode) 105; Be connected in parallel to the circuit of connecting again, can accomplish circuit and connect by the residual light modulation string 107 of resistor 106 and light-emitting diode.In first embodiment, operation principle is described below, after the source power supply conducting; Led lamp is lighted LED light string 102 under the driving of switching power converter 101, this brightness is the brightness of light fixture as key lighting, and the direct voltage on the LED light string 102 is through diode 103; Capacitor 104 is charged in the short time at the utmost point, the purpose of capacitor 104 parallel diode 105 is magnitudes of voltage of fixed capacitor 104, guarantees that be fixing discharge time each time; After the user cut off source power supply, the brightness of LED light string 102 was extinguished, capacitor this moment 104 pairs of resistors 106 and residual light modulation string 107 discharges of light-emitting diode; Light the residual light modulation string 107 of light-emitting diode; Brightness this moment is the brightness of residual light, and the time kept in several seconds time with a few minutes, up to capacitor 104 discharge end; Wherein resistors in series 106 purposes are current-limiting resistance, and discharge time is by the impedance decision of capacitor 104 with the residual light modulation string 107 of light-emitting diode.What this will remark additionally be; Switching power converter 101 can adopt the switching power converter of various different frameworks; Capacitor 104 is replaceable to be a ultracapacitor or a rechargeable battery, and the residual light modulation string of light-emitting diode 107 replaceable be the LED light string of various wavelength, colour temperature, color.
Can know by RC circuit charge-discharge principle; The current value of discharge presents the exponential type discharge, and the size of current value is different in time, causes light secretly too fierce by bright commentaries on classics in discharge time; Therefore in order to solve the different problems of current value; Reintroduce second embodiment as shown in Figure 2, as far as the residual optical circuit 121 of light-emitting diode, the output of switching power converter 101 is connected to LED light string 102; LED light string 102 is connected to the anode of diode 103; The negative electrode of diode 103 is connected to capacitor 104, and the negative electrode of parallel diode 105 is connected in parallel to the circuit of being connected by the residual light modulation string 107 of resistor 106 and light-emitting diode more again; The residual light modulation string 107 of light-emitting diode is connected in the collection utmost point of transistor 111; Its emitter-base bandgap grading is connected in the base stage of resistor 112 and transistor 110, and the collection utmost point of transistor 110 is connected to base stage and the resistor 109 of transistor 111 again, and resistor 109 connects the common joint that is back to by the negative electrode of negative electrode, capacitor 104 and the diode 103 of resistor 106, Zener diode 105 again.In a second embodiment, operation principle is described below, after the user cuts off source power supply; The brightness of LED light string 102 is extinguished, and the residual light modulation string 107 of light-emitting diode is lighted in residual light modulation string 107 discharges of 104 pairs of light-emitting diodes of capacitor this moment; Because the base stage of transistor 111 and emitter-base bandgap grading also are connected in resistor 112, the voltage of base stage and emitter-base bandgap grading is fixed voltage value, and the electric current of the resistor 112 of therefore flowing through is a fixed value; Make that the collected current of transistor 111 is a fixed value, the electric current of the residual light modulation string 107 of light-emitting diode is fixed, and luminous intensity is also fixing; Brightness this moment is the brightness of residual light, and the time kept in several seconds time with a few minutes, is lower than the forward bias voltage drop of light-emitting diode up to capacitor 104 discharge voltages; The current value of discharge presents the exponential type discharge, finishes up to discharge.
See also shown in Figure 3ly, be the third embodiment of the present invention, the residual optical circuit 122 of light-emitting diode; The output of switching power converter 101 is connected to LED light string 102, and LED light string 102 is connected to the anode of diode 103, and the negative electrode of diode 103 is connected to capacitor 104; The negative electrode of parallel diode 105 again; Be connected in parallel to the circuit of being connected by the residual light modulation string 107 of resistor 106 and light-emitting diode again, the residual light modulation string 107 of light-emitting diode is connected in the collection utmost point of transistor 111, and its emitter-base bandgap grading is connected in resistor 112; The other end ground connection of resistor 112; The base stage of transistor 111 is connected with resistor 109, and resistor 109 connects and is back to by the negative electrode of resistor 106, Zener diode 105, capacitor 104 common joint with the negative electrode of diode 103, the anode of the negative electrode serial connection diode 114 of diode 113; The anode of diode 113 is connected in the base stage of transistor 111 and the contact of resistor 109, the minus earth of diode 114.The operation principle of the 3rd embodiment is described below, and supposes that the forward bias voltage drop of diode 113 is identical with the emitter-base bandgap grading forward bias voltage drop with transistor 111 base stages, and diode 113 offsets with the base stage and the emitter-base bandgap grading forward bias voltage drop of transistor 111; The forward bias voltage drop equivalence of another diode 114 is connected to resistor 112; Therefore the electric current of resistor 112 of flowing through is a fixed value, makes that the collected current of transistor 111 is a fixed value, and the electric current of the residual light modulation string 107 of light-emitting diode is fixed; Luminous intensity is also fixing; Brightness this moment is the brightness of residual light, and the time kept in several seconds time with a few minutes, is lower than the forward bias voltage drop of light-emitting diode up to capacitor 104 discharge voltages; The current value of discharge presents the exponential type discharge, finishes up to discharge.
See also shown in Figure 4ly, be the fourth embodiment of the present invention, the residual optical circuit 123 of light-emitting diode; The output of switching power converter 101 is connected to LED light string 102; LED light string 102 is connected to the anode of diode 103, and the negative electrode of diode 103 is connected to capacitor 104, again the negative electrode of parallel diode 105; Be connected in parallel to the circuit of connecting again by the residual light modulation string 107 of resistor 106 and light-emitting diode; The residual light modulation string 107 of light-emitting diode is connected in the collection utmost point of transistor 111, and its emitter-base bandgap grading is connected in resistor 112, resistor 112 other end ground connection; The base stage of transistor 111 is connected with resistor 109; Resistor 109 connects and is back to by the negative electrode of resistor 106, Zener diode 105, capacitor 104 common joint with the negative electrode of diode 103, and the negative electrode of Zener diode 115 is connected in the base stage of transistor 111 and the contact of resistor 109, the plus earth of Zener diode 115.The operation principle of the 4th embodiment is described below, and the reverse bias of Zener diode 115 and transistor 111 base stages and emitter-base bandgap grading forward bias voltage drop are all fixed voltage value, and the reverse bias of Zener diode 115 deducts the base stage and the emitter-base bandgap grading forward bias voltage drop of transistor 111; Remaining reverse bias equivalence also is connected in resistor 112; Therefore the electric current of resistor 112 of flowing through is a fixed value, makes that the collected current of transistor 111 is a fixed value, and the electric current of the residual light modulation string 107 of light-emitting diode is fixed; Luminous intensity is also fixing; Brightness this moment is the brightness of residual light, and the time kept in several seconds time with a few minutes, is lower than the forward bias voltage drop of light-emitting diode up to capacitor 104 discharge voltages; The current value of discharge presents the exponential type discharge, finishes up to discharge.
Direct voltage source of the present invention can also change to the coil of transformer; See also shown in Figure 5ly, be the fifth embodiment of the present invention, the residual optical circuit 124 of light-emitting diode; With transformer repeatedly lateral coil 108 be connected in the anode of this diode 103; This diode 103 through this transformer repeatedly lateral coil 108 be connected to this LED light string 102, and by transformer repeatedly lateral coil 108 voltage source directly is provided, in addition; What remark additionally is that this transformer repeatedly lateral coil 108 can be applicable among second embodiment, the 3rd embodiment and the 4th embodiment equally.
Moreover; Direct voltage source of the present invention can also change to by the circuit that contains direct voltage and provide, and sees also shown in Figure 6ly, is the sixth embodiment of the present invention; The capacitor 116 of one voltage stabilizing is parallelly connected with the residual optical circuit 120 of light-emitting diode; And be electrically connected in this switching power converter 101, by this capacitor 116 voltage source be provided directly, this capacitor 116 can be applicable among second embodiment, the 3rd embodiment and the 4th embodiment equally.
Consider the wavelength, colour temperature of the residual light modulation string 107 of light-emitting diode, when color is selected as different with main light source LED light string 102; Can influence original light characteristic; Further design is when main light source LED light string 102 is lighted, and the residual light modulation string 107 of light-emitting diode is for extinguishing, when main light source LED light string 102 extinguishes; The residual light modulation string 107 of light-emitting diode can be lighted; See also Fig. 7, Fig. 8 and shown in Figure 9, be respectively the seventh embodiment of the present invention, the 8th embodiment and the 9th embodiment, in the 7th embodiment, the 8th embodiment and the 9th embodiment; Be respectively and in second embodiment, the 3rd embodiment and the 4th embodiment, increase resistor 117, resistor 118 and transistor 119; And form the residual optical circuit 125 of light-emitting diode, the residual optical circuit 126 of light-emitting diode and the residual optical circuit 127 of light-emitting diode respectively, wherein resistor 117 is connected to the anode of this diode 103 through Zener diode 130, makes the negative electrode of Zener diode 130 be connected to the input of LED light string 102 and the anode of diode 103; Anode and the other end that 117 one ends of resistor are connected to Zener diode 130 is connected to the base stage of resistor 118 and transistor 119; Resistor 118 other end ground connection, the collection utmost point of transistor 119 is connected to the base stage of transistor 111, the emitter grounding of transistor 119.So, when LED light string 102 is lighted, resistor 117 and resistor 118 dividing potential drops; Make transistor 119 be operated in conducting state, make the base stage of transistor 111 hold with being connected to, transistor 111 is operated in cut-off state; Residual light modulation string 107 no currents of light-emitting diode flow into can be not luminous, do not influence the light characteristic of main light source LED light string 102, and capacitor 104 has been full of electric charge at certain hour simultaneously; When mains switch by by or electric power system when having a power failure; Resistor 117 and resistor 118 absence of voltage, transistor 119 is operated in cut-off state, and the base stage of transistor 111 is no longer held with being connected to; Transistor 111 is operated in conducting state, and operation principle then respectively as the explanation of second embodiment, the 3rd embodiment and the 4th embodiment afterwards.What also need explain is; The circuit that relevant transistor 110, transistor 111 and transistor 119 are formed in the foregoing description; At this is for illustrating with NPN transistor; But not as limit, also replaceable is the formed equivalent electric circuit of power switch component by PNP transistor or mos field effect transistor MOSFET.
In sum; Because the present invention is through the setting of this diode, this capacitor, this Zener diode, this resistor and the residual light modulation string of this light-emitting diode; Not only after the output of this switching power converter is closed the power supply of this LED light string; The present invention still can provide several seconds to several minutes residual light by the residual light modulation string of the light-emitting diode of this residual optical circuit, with the lighting space profile, makes things convenient for the user to leave former having living space; Moreover the present invention also has simple structure, cost is low and the demand that meets the light-emitting diode constant-current circuit.
Below the present invention is done a detailed description, yet the above person is merely a preferred embodiment of the present invention, when not limiting the scope that the present invention implements.Be that all equalizations of doing according to application range of the present invention change and modify etc., all should still belong in the patent covering scope of the present invention.
Claims (7)
1. the residual optical circuit of a light-emitting diode (120,121,122,123,124,125,126,127); The residual optical circuit (120) of said light-emitting diode is connected to a LED light string (102); Said LED light string (102) is connected to the output of a switching power converter (101); It is characterized in that the residual optical circuit (120) of said light-emitting diode includes:
One is connected to the diode (103) of said LED light string (102) through anode;
One capacitor (104) that is connected with the negative electrode of said diode (103);
One Zener diode (105) that is connected with the negative electrode of said diode (103), and said Zener diode (105) is parallelly connected with said capacitor (104);
One resistor (106) that is connected with the negative electrode of said diode (103), and said resistor (106) is parallelly connected with said Zener diode (105); And
The one residual light modulation string of light-emitting diode (107) of connecting with said resistor (106).
2. the residual optical circuit (121) of light-emitting diode according to claim 1; It is characterized in that; The residual optical circuit (123) of said light-emitting diode also comprises a resistor (109), a transistor (111), a transistor (110) and a resistor (112); Said resistor (109) is connected with the negative electrode of said diode (103); Said transistor (111) is connected with the residual light modulation string of said light-emitting diode (107) and is connected with said resistor (109) through base stage through the collection utmost point; Said transistor (110) is connected with the base stage of said transistor (111) and is connected with the emitter-base bandgap grading of said transistor (111) through base stage through the collection utmost point, and said resistor (112) is connected in the base stage of said transistor (110).
3. the residual optical circuit (122) of light-emitting diode according to claim 1; It is characterized in that the residual optical circuit (122) of said light-emitting diode comprises also that diode (114) that diode (113) that transistor (111) that the resistor (109), that is connected with the negative electrode of said diode (103) is connected with the residual light modulation string of said light-emitting diode (107) and is connected with said resistor (109) through base stage through the collection utmost point, is connected with the base stage of said transistor (111) through anode, is connected with the negative electrode of said diode (113) through anode and an end are connected in the emitter-base bandgap grading of said transistor (111) and the other end is connected in the negative electrode of said diode (114) and the resistor (112) of ground connection.
4. the residual optical circuit (123) of light-emitting diode according to claim 1; It is characterized in that the residual optical circuit (123) of said light-emitting diode comprises also that Zener diode (115) that transistor (111) that the resistor (109), that is connected with the negative electrode of said diode (103) is connected with the residual light modulation string of said light-emitting diode (107) and is connected with said resistor (109) through base stage through the collection utmost point, is connected with the base stage of said transistor (111) through negative electrode and an end are connected in the emitter-base bandgap grading of said transistor (111) and the other end is connected in the anode of said Zener diode (115) and the resistor (112) of ground connection.
5. the residual optical circuit (124) of light-emitting diode according to claim 1; It is characterized in that; The residual optical circuit (124) of said light-emitting diode also comprise one be connected in the anode of said diode (103) transformer lateral coil (108) repeatedly, said diode (103) through said transformer repeatedly lateral coil (108) be connected to said LED light string (102).
6. the residual optical circuit of light-emitting diode according to claim 1 (120,121,122,123,124,125,126,127) is characterized in that, said capacitor (104) is a rechargeable battery.
7. according to the residual optical circuit (125,126,127) of claim 2,3 or 4 described light-emitting diodes; It is characterized in that; The residual optical circuit of said light-emitting diode (125,126,127) also comprise one be connected to the anode of said diode (103) through negative electrode Zener diode (130), be connected to resistor (118) that the resistor (117), of the anode of said Zener diode (130) connects with said resistor (117) and and be connected between said resistor (117) and the said resistor (118) and be connected to the transistor (119) of the base stage of said transistor (111) through the collection utmost point through base stage, and the emitter-base bandgap grading of said transistor (119) is connected in an end and the ground connection of said resistor (118) away from said resistor (117).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW100121341 | 2011-06-20 | ||
| TW100121341A TW201301939A (en) | 2011-06-20 | 2011-06-20 | Residual light circuit for LED |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102843818A true CN102843818A (en) | 2012-12-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100429342A Pending CN102843818A (en) | 2011-06-20 | 2012-02-22 | Residual light circuit of light-emitting diode |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2013004960A (en) |
| CN (1) | CN102843818A (en) |
| TW (1) | TW201301939A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015064452A (en) * | 2013-09-24 | 2015-04-09 | 株式会社ビクセン | Field illumination device, observation optical device using field illumination device, and field illumination method |
| JP2015138669A (en) | 2014-01-22 | 2015-07-30 | パナソニックＩｐマネジメント株式会社 | Luminaire and lighting circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009104792A (en) * | 2007-10-19 | 2009-05-14 | Kawamura Electric Inc | Guard light for blackout |
| CN101815377A (en) * | 2010-04-07 | 2010-08-25 | 东莞市格尔电器科技有限公司 | Control system of fluorescent lamp and LED lamp integrated energy-saving lamp |
| JP2011082045A (en) * | 2009-10-08 | 2011-04-21 | Igarashi Bussan Kk | Led lamp |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55127084A (en) * | 1979-03-26 | 1980-10-01 | Nec Corp | Lighting circuit for light emitting diode |
| JP2004303612A (en) * | 2003-03-31 | 2004-10-28 | Kawamura Electric Inc | Security lamp for power failure |
| JP2005327845A (en) * | 2004-05-13 | 2005-11-24 | Matsushita Electric Ind Co Ltd | Led lighting device and display device |
| JP2007143242A (en) * | 2005-11-16 | 2007-06-07 | Ntt Facilities Inc | Distribution switchboard |
| JP5241654B2 (en) * | 2009-08-31 | 2013-07-17 | ユニチカ株式会社 | Pellet mixture for melt molding, method for producing the same, and molded product using the pellet mixture for melt molding |
-
2011
- 2011-06-20 TW TW100121341A patent/TW201301939A/en unknown
-
2012
- 2012-02-21 JP JP2012034651A patent/JP2013004960A/en active Pending
- 2012-02-22 CN CN2012100429342A patent/CN102843818A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009104792A (en) * | 2007-10-19 | 2009-05-14 | Kawamura Electric Inc | Guard light for blackout |
| JP2011082045A (en) * | 2009-10-08 | 2011-04-21 | Igarashi Bussan Kk | Led lamp |
| CN101815377A (en) * | 2010-04-07 | 2010-08-25 | 东莞市格尔电器科技有限公司 | Control system of fluorescent lamp and LED lamp integrated energy-saving lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2013004960A (en) | 2013-01-07 |
| TW201301939A (en) | 2013-01-01 |
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Application publication date: 20121226 |