CN104333958A - Illumination circuit and lamp strip using the same - Google Patents
Illumination circuit and lamp strip using the same Download PDFInfo
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- CN104333958A CN104333958A CN201410675647.4A CN201410675647A CN104333958A CN 104333958 A CN104333958 A CN 104333958A CN 201410675647 A CN201410675647 A CN 201410675647A CN 104333958 A CN104333958 A CN 104333958A
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Abstract
The invention relates to the technical field of electron, in particular to an illumination circuit and a lamp strip using the same. The illumination circuit comprises a plurality of light emitting units connected in series, each light emitting unit comprises more than one LED, the illumination circuit further comprises at least one protection circuit, the protection circuit comprises a voltage regulator diode, at least one light emitting unit of the illumination circuit is connected with the protection circuit in parallel, and the stabilized voltage value of the voltage regulator diode in the protection circuit is larger than the end voltage of the working light emitting unit connected with the protection circuit in parallel. By means of the illumination circuit, the lamp strip is avoided from large dark region, the brightness is stable, the efficiency for converting electric energy into light energy is improved, and components and parts in the protection circuit can be effectively protected.
Description
Technical field
The present invention relates to electronic technology field, particularly relate to the light bar of a kind of lighting circuit and this lighting circuit of use.
Background technology
The existing LED connecing 220V civil power, normally a kind of flexible LED SMD lamp belt, its architectural feature is as shown in CN102095118A, comprise a heart yearn, by flexiplast extrusion molding a predetermined length, the shoestring of light-permeable, this heart yearn is longitudinally provided with a groove therein, and, be embedded with at least two wires in this heart yearn, conductor spacing ground longitudinally arrange and isometric with heart yearn; Many flexible tape circuit boards, every bar circuit board is provided with at least one row LED paster, the two ends of every bar circuit board are respectively equipped with at least one lead-in wire, and lead-in wire and above-mentioned wire are connected to form loop and are that LED paster (also can claim luminescence unit) on this circuit board power, all circuit boards to be arranged in above-mentioned groove and to leave gap at length direction between adjacent circuit plate and be interrupted shape; One coating layer, by flexiplast extrusion molding, with above-mentioned heart yearn isometric, light-permeable, coating layer is coated on outside above-mentioned heart yearn and circuit board; Lead-in wire is positioned at outside above-mentioned gap with the joint of wire.Circuit on circuit board comprises the current-limiting resistance be connected in series, some LED pasters and other components and parts, and each LED paster comprises several LED be connected in series, and its structure is as shown in Fig. 7 of CN201885188U.Damage as long as the drawback of this circuit structure is as shown in Figure 1 a LED on series circuit, the LED on whole circuit board does not all work.Because every bar circuit board connects 220V civil power, make every bar circuit board will have certain length to arrange the LED of some like this, in actual product, the length of every bar flexible PCB is between 50 ~ 100CM, even longer, as long as there is the LED of a flexible PCB not work like this in flexible LED SMD lamp belt, will visually form obvious blanking bar.
In order to reduce the generation of above-mentioned situation, change the connected mode of the some light-emitting diodes on LED paster into parallel connection by series connection.As shown in Figure 2; this circuit comprises the current-limiting resistance, diode and the some luminescence units (this luminescence unit specific product can show as LED paster) that are connected in series; each described luminescence unit comprises two light-emitting diodes be connected in parallel; this circuit structure serves certain protective effect; if on luminescence unit one LED in parallel damages, circuit breaker can not be caused.But also at least there is following defect in this structure:
1, in order to make LED on circuit normally work, circuit needs arrange current-limiting resistance or other play the components and parts of metering function, and in order to make the LED normal luminous in luminescence unit parallel branch, need specified electric current, so, luminescence unit parallel branch is more, and the electric current of current supply circuit is larger, cause too much electric energy to be fallen by the current-limiting resistance on circuit or other non-luminescent components consume, electric energy conversion is that the conversion ratio of luminous energy is lower.
2, when the LED in arbitrary parallel branch of a luminescence unit damages, its electric current is shared on the LED of other branch roads of this luminescence unit, exceedes its rated operational current, causes it very easily to damage.As the parallel circuits of Fig. 2, if its total current is 40mA, the electric current of the parallel branch of each luminescence unit is 20mA, the LED just meeting parallel branch uses, but when the LED of a parallel branch of this luminescence unit damages, then another parallel branch will bear the electric current of 40mA, causes it very easily to damage, and then cause whole series circuit open circuit, make light bar visually form obvious blanking bar.
Moreover present cost of labor is more and more higher, maintenance light bar brings huge cost and inconvenience by giving manufacturing enterprise or user, and therefore the circuit structure of above-mentioned light bar has necessity of improvement.
Summary of the invention
First object of the present invention is to provide one can subtract reduced-maintenance lighting circuit.
Second object of the present invention is to provide one can subtract reduced-maintenance light bar.
For realizing above-mentioned first object, the present invention adopts following scheme:
A kind of lighting circuit; this lighting circuit comprises the some luminescence units be connected in series; described luminescence unit comprises more than one LED; it is characterized in that: lighting circuit also comprises at least one protective circuit; this protective circuit includes zener diode (having another name called " Zener diode "); lighting circuit has at least a luminescence unit and protective circuit are connected in parallel, the stable voltage of the voltage stabilizing didoe in described protective circuit is greater than the terminal voltage when luminescence unit in parallel with this protective circuit works.
Wherein, lighting circuit also comprises the reverse-current protection circuit be connected in series with described some luminescence units.
Reverse-current protection circuit described above comprises the diode that forward connects.
The diode that in reverse-current protection circuit described above, forward connects is current regulator diode.
Reverse-current protection circuit described above comprises the light-emitting diode that forward connects.
For realizing above-mentioned second object, the present invention adopts following scheme:
A kind of light bar, comprise the shoestring of a printing opacity, at least two wires are embedded with in this shoestring, many flexible tape circuit boards, every bar circuit board comprises a lighting circuit, this lighting circuit comprises the some luminescence units be connected in series, every bar circuit board and above-mentioned wire are connected to form the current supply circuit of lighting circuit, described luminescence unit comprises more than one LED, it is characterized in that: lighting circuit also comprises at least one protective circuit, this protective circuit includes zener diode, lighting circuit have at least a luminescence unit and protective circuit are connected in parallel, the stable voltage of the voltage stabilizing didoe in described protective circuit is greater than the terminal voltage when luminescence unit in parallel with this protective circuit normally works.
Wherein, lighting circuit also comprises the reverse-current protection circuit be connected in series with described some luminescence units.
Reverse-current protection circuit described above comprises the diode that forward connects.
The diode that in reverse-current protection circuit described above, forward connects is current regulator diode.
Reverse-current protection circuit described above comprises the light-emitting diode that forward connects.
Compared to existing technology, the present invention has following beneficial effect:
1, add the design of protective circuit in lighting circuit, damage if overcome a LED in prior art, cause the problem that the LED on whole circuit board does not all work;
2, when circuit normally works, stable voltage due to the voltage stabilizing didoe in protective circuit is greater than terminal voltage when luminescence unit in parallel with it normally works, so voltage stabilizing didoe is not conducting, all luminescence unit tandem workings, therefore in lighting circuit, the electric current through current-limiting resistance or other non-luminescent elements is less, energy consumption is less, and overcoming electric energy conversion in prior art is the too low defect of the conversion ratio of luminous energy;
3; voltage stabilizing didoe is included in protective circuit; and pressure drop when normally working of the stable voltage of voltage stabilizing didoe and luminescence unit in parallel is with it more or less the same; therefore; when there being LED damage to cause the luminescence unit at this LED place not work, other luminescence units normally worked there will not be the situation of obvious brightness change or instability.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of a kind of LED illumination circuit of prior art;
Fig. 2 is the circuit diagram of the another kind of LED illumination circuit of prior art;
Fig. 3 is the circuit diagram of the embodiment one of lighting circuit of the present invention;
Fig. 4 is the circuit diagram of the embodiment two of lighting circuit of the present invention;
Fig. 5 is the circuit diagram of the embodiment three of lighting circuit of the present invention;
Fig. 6 is a kind of circuit diagram of the embodiment four of lighting circuit of the present invention;
Fig. 7 is the another kind of circuit diagram of the embodiment four of lighting circuit of the present invention;
Fig. 8 is the circuit diagram of the embodiment five of lighting circuit of the present invention;
Fig. 9 is the structural representation of the cross section of the embodiment one of light bar of the present invention;
Figure 10 is the A-A cutaway view of Fig. 9;
Figure 11 is the vertical view of Figure 10, and wherein heart yearn 2 and coating layer 3 are in perspective;
Figure 12 is the upward view of Figure 10, and wherein heart yearn 2 and coating layer 3 are in perspective;
Figure 13 is the using state schematic diagram of the embodiment one of light bar of the present invention.
Figure 14 is the circuit diagram of the embodiment two of light bar of the present invention;
Embodiment
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Lighting circuit embodiment one
As shown in Figure 3; a kind of lighting circuit; lighting circuit comprises the some luminescence units be connected in series; each luminescence unit comprises several LED and at least one current-limiting resistance that forward is connected in series; some groups of protective circuits are had in lighting circuit; each group of protective circuit comprises the zener diode of at least one Opposite direction connection; one group of luminescence unit and one group of protective circuit are connected in parallel; wherein, the stable voltage of the voltage stabilizing didoe in protective circuit is greater than the terminal voltage when luminescence unit in parallel with this protective circuit normally works.
When circuit normally works; each light-emitting diode in each group luminescence unit is in normally state; for first group of luminescence unit; the voltage sum of the pressure drop of light-emitting diode Da1, Da2, Da3, Da4, Da5, Da6 and the terminal voltage of current-limiting resistance Ra1 is the operating voltage Ua1 of this group luminescence unit, and the burning voltage Uaz1 of the voltage stabilizing didoe Wa1 in protective circuit will be a bit larger tham Ua1.Because Ua1 is less than Uza1, voltage stabilizing didoe is in not on-state.
Damage when there being one or more light-emitting diode in arbitrary luminescence unit, as in first group, in light-emitting diode Da1, Da2, Da3, Da4, Da5, Da6 after any one or multiple damage, the circuit of first group of luminescence unit is in open-circuit condition, in open circuit moment, the voltage at voltage stabilizing didoe two ends equals supply voltage Uv, because Uv is greater than the burning voltage Uza1 of voltage stabilizing didoe, therefore, voltage stabilizing didoe is reversed and punctures and conducting, and this voltage stabilizing didoe and other luminescence units are connected into a loop jointly.
So, the beneficial effect of the lighting circuit generation of the present embodiment:
The damage of one or more light-emitting diode does not affect the normal work of other luminescence units.And the pressure drop that stable voltage and the luminescence unit in parallel with it due to the voltage stabilizing didoe of this conducting normally work is more or less the same, and can ensure other luminescence units steady operation under normal operation.
It should be noted that the present embodiment is a preferred embodiment of the present invention, in invention process, the voltage stabilizing didoe that part is in parallel with luminescence unit can be removed.
Lighting circuit embodiment two
Lighting circuit as described in lighting circuit embodiment one; when lighting circuit two termination alternating voltage or user are by mistake by lighting circuit two termination inverse time; reverse current is there is in lighting circuit; light-emitting diode in luminescence unit is in cut-off state; and the voltage stabilizing didoe forward conduction in the protective circuit in parallel with each luminescence unit, just form series loop between each voltage stabilizing didoe and power supply.Pressure drop during forward conduction due to each voltage stabilizing didoe is less, makes the electric current in described series loop exceed the rated operational current of each voltage stabilizing didoe, easily burns out voltage stabilizing didoe.
So; present embodiments provide a kind of lighting circuit as shown in Figure 4; with lighting circuit embodiment one unlike; the reverse-current protection circuit 7 be connected in series with luminescence unit is also comprised in lighting circuit; in the present embodiment; reverse-current protection circuit 7 comprises the diode that a forward is connected in series, and the diode that this forward is connected in series can be current regulator diode.When the voltage at lighting circuit two ends is normal forward voltage, if forward voltage fluctuates within the specific limits, this current regulator diode can ensure the current constant through lighting circuit.When the voltage at lighting circuit two ends is reverse voltage, the diode in reverse-current protection circuit 7 is cut-off, so open a way in the loop that voltage stabilizing didoe and power supply are formed, available protecting voltage stabilizing didoe is not burned.
The beneficial effect of the lighting circuit generation of the present embodiment:
When lighting circuit two termination alternating voltage or user are by mistake by lighting circuit two termination inverse time, open a way in the loop that voltage stabilizing didoe and power supply are formed, each components and parts in available protecting lighting circuit.
Lighting circuit embodiment three
As shown in Figure 5, the present embodiment additionally provides a kind of lighting circuit, this lighting circuit comprises the some luminescence units be connected in series, 12 groups of luminescence units are had in the present embodiment, each luminescence unit comprises 3 LED be connected in series, part luminescence unit also includes a current-limiting resistance, 12 groups of protective circuits are included in lighting circuit, each group of protective circuit is in series with a zener diode, one group of luminescence unit and one group of protective circuit are connected in parallel, wherein, the stable voltage of the voltage stabilizing didoe in protective circuit is greater than the terminal voltage when luminescence unit in parallel with this protective circuit normally works, lighting circuit also comprises the reverse-current protection circuit 7 be connected in series with luminescence unit, in the present embodiment, reverse protection circuit 7 comprises the diode that a forward is connected in series, the diode that this forward connects can be current regulator diode.When the voltage at lighting circuit two ends is normal forward voltage, if forward voltage fluctuates within the specific limits, this current regulator diode can ensure the current constant through lighting circuit.
When circuit normally works; 3 light-emitting diodes in each group luminescence unit are in normally state; for first group of luminescence unit; the pressure drop sum of light-emitting diode Dc1, Dc2, Dc3 is the operating voltage Uc1 of this group luminescence unit, and the burning voltage Uzc1 of the voltage stabilizing didoe Wc1 in protective circuit will be a bit larger tham Uc1.Because Uc1 is less than Uzc1, voltage stabilizing didoe W1 is in not on-state.For second group of luminescence unit; the voltage sum of the pressure drop of light-emitting diode Dc4, Dc5, Dc6 and the terminal voltage of current-limiting resistance Rc1 is the operating voltage Uc2 of this group luminescence unit, and the burning voltage Uzc2 of the voltage stabilizing didoe Wc2 in protective circuit will be a bit larger tham Uc2.Because Uc2 is less than Uzc2, voltage stabilizing didoe Wc2 is in not on-state.
The operation principle of circuit is identical with lighting circuit embodiment two, after having one or more light-emitting diode to damage in arbitrary luminescence unit, as the light-emitting diode Dc1 in first group, Dc2, in Dc3 after any one or multiple damage, the light-emitting diode of other luminescence units all normally works.When the voltage at lighting circuit two ends is reverse voltage, the diode in reverse-current protection circuit is cut-off, so open a way in the loop that voltage stabilizing didoe and power supply are formed, available protecting voltage stabilizing didoe is not burned.
With lighting circuit embodiment two unlike, in the lighting circuit of the present embodiment, the LED quantity that the forward of each luminescence unit is connected in series is different.
As shown in Figure 4, often organize the LED quantity of connecting in luminescence unit is 6, in the present embodiment to lighting circuit embodiment two, and the LED quantity often organizing series connection is 3.Therefore, the LED quantity often organized in luminescence unit is less.
The beneficial effect of the present embodiment:
When the one or more LED in arbitrary group of luminescence unit damage, less on the impact of the illumination effect of whole circuit due to this group luminescence unit cisco unity malfunction.
Lighting circuit embodiment four
As shown in Figure 6, the present embodiment additionally provides a kind of lighting circuit, this lighting circuit comprises the some luminescence units be connected in series, 18 groups of luminescence units are had in the present embodiment, each luminescence unit comprises 2 LED be connected in series, part luminescence unit also comprises the current-limiting resistance joined with these 2 LED strip, 18 groups of protective circuits are had in lighting circuit, each group of protective circuit is in series with a zener diode, one group of luminescence unit and one group of protective circuit are connected in parallel, wherein, the stable voltage of the voltage stabilizing didoe in protective circuit is greater than the terminal voltage when luminescence unit in parallel with this protective circuit normally works, lighting circuit also comprises the reverse-current protection circuit 7 be connected in series with luminescence unit, in the present embodiment, reverse protection circuit 7 comprises the diode that a forward is connected in series, the diode that this forward connects can be current regulator diode.The diode that this forward connects can be current regulator diode.When the voltage at lighting circuit two ends is normal forward voltage, if forward voltage fluctuates within the specific limits, this current regulator diode can ensure the current constant through lighting circuit.
When circuit normally works; 2 light-emitting diodes in each group luminescence unit are in normally state; for first group of luminescence unit; the pressure drop sum of light-emitting diode Dd1, Dd2 is the operating voltage Ud1 of this group luminescence unit, and the burning voltage Uzd1 of the voltage stabilizing didoe Wd1 in protective circuit will be a bit larger tham Ud1.Because Ud1 is less than Uzd1, voltage stabilizing didoe Wd1 is in not on-state.For second group of luminescence unit, the voltage sum of the pressure drop of light-emitting diode Dd3, Dd4 and the terminal voltage of current-limiting resistance Rd1 is the operating voltage Ud2 of this group luminescence unit, and the burning voltage Uzd2 of the voltage stabilizing didoe Wd2 in protective circuit will be a bit larger tham Ud2.Because Ud2 is less than Uzd2, voltage stabilizing didoe Wd2 is in not on-state.For the 3rd group of luminescence unit, the pressure drop sum of light-emitting diode Dd5, Dd6 is the operating voltage Ud3 of this group luminescence unit, and the burning voltage Uzd3 of the voltage stabilizing didoe Wd3 in protective circuit will be a bit larger tham Ud3.Because Ud3 is less than Uzd3, voltage stabilizing didoe Wd3 is in not on-state.
The operation principle of circuit is identical with lighting circuit embodiment two, after having one or more light-emitting diode to damage in arbitrary luminescence unit, as the light-emitting diode Dd1 in first group, after in Dd2, any one or two damage, the light-emitting diode of other luminescence units all can normally work.When the voltage at lighting circuit two ends is reverse voltage, the diode in reverse-current protection circuit is cut-off, so open a way in the loop that voltage stabilizing didoe and power supply are formed, available protecting voltage stabilizing didoe is not burned.With lighting circuit embodiment two and lighting circuit embodiment three unlike, in the lighting circuit of the present embodiment, the LED quantity that the forward of each luminescence unit is connected in series is different.
As shown in Figure 4, often organize the LED quantity of connecting in luminescence unit is 6 to lighting circuit embodiment two, and as shown in Figure 5, often organize the LED quantity of connecting in luminescence unit is 3, in the present embodiment to lighting circuit embodiment three, and the LED quantity often organizing series connection is 2.Therefore, the LED quantity often organized in luminescence unit is less.
The beneficial effect of the present embodiment:
When the one or more LED in arbitrary group of luminescence unit damage, less on the impact of the illumination effect of whole circuit due to this group luminescence unit cisco unity malfunction.
It should be noted that, in any one lighting circuit of lighting circuit embodiment two to lighting circuit embodiment four, the diode in current protecting circuit also can be light-emitting diode.For lighting circuit embodiment two, using light-emitting diode as the diode in reverse-current protection circuit in lighting circuit, obtain circuit diagram as shown in Figure 7.
Lighting circuit embodiment five
As shown in Figure 8, with one of lighting circuit embodiment one to lighting circuit embodiment four unlike, can also current-limiting resistance be in series with between each luminescence unit, play the effect of current limliting based on the current-limiting resistance of connecting with each luminescence unit, in each luminescence unit, can current-limiting resistance have been saved.
Circuit working principle is identical with lighting circuit embodiment two to lighting circuit embodiment four, and after having one or more light-emitting diode to damage in arbitrary luminescence unit, the light-emitting diode of other luminescence units all can normally work.
When lighting circuit two termination alternating voltage or user are by mistake by lighting circuit two termination inverse time, open a way in the loop that voltage stabilizing didoe and power supply are formed, each components and parts in available protecting lighting circuit.
Detailed introduction is done to the embodiment of lighting circuit of the present invention above.Below the light bar corresponding to above-mentioned lighting circuit is further elaborated.
Light bar embodiment one
As shown in Fig. 9 to Figure 13, a kind of light bar, comprise: a heart yearn 2, by flexiplast extrusion molding a predetermined length, the shoestring of light-permeable, this heart yearn 2 is provided with a groove 21 along its length therein, further, in this heart yearn 1, be embedded with two wires 4, wire 4 compartment of terrain along heart yearn length direction arrange and isometric with heart yearn 2; Many flexible tape circuit boards 6, every bar circuit board 6 is provided with a row LED paster 61, the two ends of every bar circuit board 6 are respectively equipped with a lead-in wire 62, and lead-in wire 62 and above-mentioned wire 4 are connected to form loop and are that LED paster 61 on this circuit board 6 is powered, all circuit boards 6 to be arranged in above-mentioned groove 21 and to leave gap 11 and in interrupted shape at heart yearn length direction between adjacent circuit plate 6; One coating layer 3, by flexiplast extrusion molding, with above-mentioned heart yearn 2 isometric, light-permeable, coating layer 3 is coated on outside above-mentioned heart yearn 2 and circuit board 6.Coating layer and heart yearn form the shoestring of light bar.
Heart yearn 2 and coating layer 3 all can adopt flexible PVC plastic to be made by extruding-out process, and wire 41,42 can be copper stranded conductor or alloy twisted wire, and LED paster 61 can adopt 3020, and 3528,5050,5070 etc.
As shown in figure 13, during use, some light bar 1 can be connected by transition joint 5 as required, every bar light bar one end connects rectifier 7 by wire, access civil power (220V AC power supplies) by attaching plug 8 again can light, press the corresponding fixed installation mode of used occasion, if for inside and outside fixed chamber during cement wall, buckle 9 can be adopted.
As shown in Figure 9, the cross section of coating layer 3 can be rectangular, and above-mentioned wire 4 is positioned at the diapire of the cross section of heart yearn 2.
Circuit board 6 is provided with resistance 63, and resistance 63 and LED paster 61 are connected between two wires 4.
As shown in figure 11, the LED paster 61 on each circuit board 6 is all equally spaced along heart yearn length direction.
As shown in figure 12, the two ends 66 (two ends 66 in Figure 12 are in the back side) of every bar circuit board 6 make lead-in wire 62 be positioned at the back side of circuit board 6 towards back side turnover.Lead-in wire 62 is positioned at outside above-mentioned gap 11 with the junction 12 of wire 4.
The light bar of the present embodiment applies any one lighting circuit of lighting circuit embodiment one to five.This lighting circuit comprises the some luminescence units be connected in series; every bar circuit board and above-mentioned wire are connected to form the current supply circuit of lighting circuit; described luminescence unit comprises more than one LED; lighting circuit also comprises at least one protective circuit; this protective circuit includes zener diode; lighting circuit has at least a luminescence unit and protective circuit are connected in parallel, the stable voltage of the voltage stabilizing didoe in described protective circuit is greater than the terminal voltage when luminescence unit in parallel with this protective circuit works.
When any one lighting circuit of the light bar employing lighting circuit embodiment two to five of the present embodiment,
Lighting circuit also comprises the reverse-current protection circuit be connected in series with described some luminescence units.
Described reverse-current protection circuit comprises the diode that forward connects.
The diode that in described reverse-current protection circuit, forward connects is current regulator diode.
Described reverse-current protection circuit comprises the light-emitting diode that forward connects.
The beneficial effect of the present embodiment:
In light bar, the damage of one or more LED does not affect the normal work of other luminescence units of light bar lighting circuit.And the pressure drop that stable voltage and the luminescence unit in parallel with it due to the voltage stabilizing didoe of conducting in the protective circuit of lighting circuit normally work is more or less the same, and can ensure other luminescence units steady operation under normal operation.
When the lighting circuit two termination alternating voltage of light bar or user are by mistake by the lighting circuit two termination inverse time of light bar, open a way in the loop that in lighting circuit, voltage stabilizing didoe and power supply are formed, each components and parts in available protecting lighting circuit.
Light bar embodiment two
The present embodiment additionally provides a kind of light bar, with light bar embodiment one unlike, a part of light-emitting diode at least one group of luminescence unit in lighting circuit and one group of protective circuit are connected in parallel by the present embodiment; Simultaneously using the other a part of light-emitting diode in former luminescence unit as the diode in reverse-current protection circuit in the present embodiment, be connected in series with luminescence unit each in the present embodiment.
Exemplary; as shown in Fig. 3 and Figure 14; by in parallel with protective circuit for 5 light-emitting diodes in first group of luminescence unit in Fig. 3 lighting circuit; and the another one light-emitting diode in first group of luminescence unit is connected in series as the diode in reverse-current protection circuit and each luminescence unit, obtain circuit diagram shown in Figure 14.
In the present embodiment, using a part of light-emitting diode in script luminescence unit as the diode in reverse-current protection circuit, ensure that the uniformity of luminance of whole piece light bar.
Below be only that the specific embodiment in the present invention is illustrated, every according to equivalent transformation or decoration done by the design concept in the present invention, all should think and fall into protection scope of the present invention.
Claims (10)
1. a lighting circuit; this lighting circuit comprises the some luminescence units be connected in series; described luminescence unit comprises the more than one LED that forward connects; it is characterized in that; lighting circuit comprises at least one protective circuit; this protective circuit includes the zener diode of Opposite direction connection; lighting circuit has at least a luminescence unit and protective circuit are connected in parallel, the stable voltage of the voltage stabilizing didoe in described protective circuit is greater than the terminal voltage when luminescence unit in parallel with this protective circuit works.
2. lighting circuit according to claim 1, is characterized in that, lighting circuit also comprises the reverse-current protection circuit be connected in series with described some luminescence units.
3. lighting circuit according to claim 2, is characterized in that, described reverse-current protection circuit comprises the diode that forward connects.
4. lighting circuit according to claim 3, is characterized in that, the diode that described forward connects is current regulator diode.
5. lighting circuit according to claim 2, is characterized in that, described reverse-current protection circuit comprises the light-emitting diode that forward connects.
6. a light bar, comprise the shoestring of a printing opacity, at least two wires are embedded with in this shoestring, many flexible tape circuit boards, every bar circuit board comprises a lighting circuit, this lighting circuit comprises the some luminescence units be connected in series, every bar circuit board and above-mentioned wire are connected to form the current supply circuit of lighting circuit, described luminescence unit comprises more than one LED, it is characterized in that, lighting circuit also comprises at least one protective circuit, this protective circuit includes zener diode, lighting circuit have at least a luminescence unit and protective circuit are connected in parallel, the stable voltage of the voltage stabilizing didoe in described protective circuit is greater than the terminal voltage when luminescence unit in parallel with this protective circuit works.
7. light bar according to claim 6, is characterized in that, lighting circuit also comprises the reverse-current protection circuit be connected in series with described some luminescence units.
8. light bar according to claim 7, is characterized in that, described reverse-current protection circuit comprises the diode that forward connects.
9. light bar according to claim 8, is characterized in that, the diode that described forward connects is current regulator diode.
10. light bar according to claim 7, is characterized in that, described reverse-current protection circuit comprises the light-emitting diode that forward connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410675647.4A CN104333958A (en) | 2014-11-20 | 2014-11-20 | Illumination circuit and lamp strip using the same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410675647.4A CN104333958A (en) | 2014-11-20 | 2014-11-20 | Illumination circuit and lamp strip using the same |
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| CN104333958A true CN104333958A (en) | 2015-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410675647.4A Pending CN104333958A (en) | 2014-11-20 | 2014-11-20 | Illumination circuit and lamp strip using the same |
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Cited By (4)
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| CN106090669A (en) * | 2016-07-27 | 2016-11-09 | 徐彬 | A kind of LED line |
| US20190093870A1 (en) * | 2017-09-26 | 2019-03-28 | Guangdong Oml Technology Co., Ltd | Lamp Strip |
| US10775003B1 (en) * | 2019-04-30 | 2020-09-15 | Guangdong Oml Technology Co., Ltd | LED light strip |
| CN113671752A (en) * | 2021-08-19 | 2021-11-19 | 深圳市华星光电半导体显示技术有限公司 | Light-emitting substrate and display device |
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