CN218388010U - Multi-section linear constant-current LED lamp - Google Patents

Abstract

The application provides a multi-section linear constant-current LED lamp, which comprises a rectifying module, LED lamp strings and a driving module, wherein the LED lamp strings comprise first lamp strings, second lamp strings and third lamp strings which are connected in series, the first lamp strings comprise i first lamp beads, the second lamp strings comprise j second lamp beads, the third lamp strings comprise k third lamp beads, when the LED lamp strings are lightened, in an alternating-current half wave, the luminous flux of the first lamp beads is first luminous flux, the luminous flux of the second lamp beads is second luminous flux, and the luminous flux of the third lamp beads is third luminous flux.

Description

Multi-section linear constant-current LED lamp

Technical Field

The application relates to the technical field of LEDs, in particular to a multi-segment linear constant-current LED lamp.

Background

As LEDs enter commercial and home lighting on a large scale, more stringent requirements are placed on the performance, price, and reliability of LED products. On one hand, the light emitting efficiency of the LED is required to be continuously improved, the price is required to be continuously reduced, and on the other hand, more requirements are also provided for the service life of the LED lamp. Because the power supply is similar to the traditional switching power supply principle, the circuit is complex, the number of electronic elements is large, the production process is complex, the production cost is high, and the failure probability is high. In order to reduce the cost, a high-voltage linear constant-current IC scheme is adopted in the industry, a high-frequency transformer is not needed in the scheme, electrolytic capacitors are not needed in part of the schemes, the process flow of the lamp is simplified, the aim of directly driving the LED by commercial power is fulfilled, and the cost is greatly reduced.

The linear constant current scheme generally adopts a single-section linear constant current scheme and a multi-section linear constant current scheme, and the single-section linear constant current scheme has no power factor correction and can not meet some standard requirements, so that the multi-section linear constant current scheme is adopted to realize high PF (power factor) and low THD (harmonic distortion), and the multi-section linear constant current scheme can be applied to a wider voltage range. However, due to the multi-section scheme, the current flowing time of each section of LED is different, so that the brightness of each section of LED is different, and the problem that the brightness of the LED lamp tube is not uniform when the multi-section linear constant current scheme is applied to the LED lamp tube is caused, the problem of light spots is caused, and the illumination effect is influenced.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the application is to provide a multi-segment linear constant current LED lamp, which is used for solving the problems that in the existing multi-segment linear constant current LED lamp, the flowing time of each segment of LED current is different, and the brightness of each segment of LED is different, so that the multi-segment linear constant current scheme is applied to the LED lamp tube, the brightness of the LED lamp tube is not uniform, the problem of light spots occurs, and the illumination effect is influenced.

The embodiment of the application provides a multi-section linear constant current LED lamp, which comprises a rectifying module, an LED lamp string and a driving module;

the input end of the LED lamp string is connected with a power supply rectified by an alternating current power supply;

the LED lamp string comprises a first lamp string, a second lamp string and a third lamp string which are connected in series; the first lamp string comprises i first lamp beads, the second lamp string comprises j second lamp beads, and the third lamp string comprises k third lamp beads; when the LED lamp string is lightened, in an alternating-current half wave, the luminous flux of the first lamp bead is a first luminous flux, the luminous flux of the second lamp bead is a second luminous flux, the luminous flux of the third lamp bead is a third luminous flux, and the first luminous flux is larger than the second luminous flux and larger than the third luminous flux;

the output ends of the first lamp string, the second lamp string and the third lamp string are respectively connected with the first input end, the second input end and the third input end of the driving module, and the output end of the driving module is grounded;

the driving module is used for sequentially driving the first light string, the second light string and the third light string to light;

wherein, the mode of arrangement of first lamp pearl, second lamp pearl and third lamp pearl does: the i first lamp beads are uniformly arranged, and at least one second lamp bead and/or at least one third lamp bead are inserted between two adjacent first lamp beads.

In the above technical scheme, the multi-section linear constant current LED lamp comprises a rectifying module, an LED lamp string and a driving module, the LED lamp string comprises a first lamp string, a second lamp string and a third lamp string which are connected in series, the first lamp string comprises i first lamp beads, the second lamp string comprises j second lamp beads, the third lamp string comprises k third lamp beads, when the LED lamp string is turned on, in an alternating current half-wave, luminous flux of the first lamp beads is first luminous flux, luminous flux of the second lamp beads is second luminous flux, and luminous flux of the third lamp beads is third luminous flux, according to the first luminous flux, the second luminous flux and the third luminous flux, the i first lamp beads, the j second lamp beads and the k third lamp beads are arranged in a lamp bead vacancy of the LED lamp tube in a manner that the luminous flux is uniform, for example, the second lamp beads with lower luminous flux or the third lamp beads with higher luminous flux are inserted between the two first lamp beads, so that the luminance of the LED lamp tube is uniform, the problem of light spots is avoided, and the illumination effect is improved.

It should be clear that "LED fluorescent tube luminance is even" in this application a plurality of embodiments, it is as even as possible from the luminance that human eyes' impression reached, because the luminous flux of first lamp pearl, second lamp pearl and third lamp pearl is different, it is complete even to accomplish the luminance of every position of LED fluorescent tube, nevertheless, insert between the lamp pearl that luminous flux is stronger through the lamp pearl that luminous flux is lower, perhaps regard a plurality of lamp pearls as the repetitive unit circulation arrangement, can make the holistic luminance of LED fluorescent tube even.

In some optional embodiments, the device further comprises a rectification module;

the input end of the rectifying module is connected with an alternating current power supply, the output positive end of the rectifying module is connected with the input end of the LED lamp string, and the output negative end of the rectifying module is grounded.

In some alternative embodiments, the driving module includes a driving chip;

the output ends of the first light string, the second light string and the third light string are respectively connected with the first input end, the second input end and the third input end of the driving chip, the third input end of the driving chip is further connected to the LN end of the driving chip through the first resistor, the GND end of the driving chip is grounded, and the CS end of the driving chip is grounded after passing through the second resistor.

In some optional embodiments, the sum of the i first lamp beads, the j second lamp beads and the k third lamp beads is m total number of the lamp beads of the LED lamp string, and m lamp beads are arranged on m lamp bead vacant positions uniformly distributed in the LED lamp tube;

the total number m of the lamp beads is calculated by load LED voltage Vled and the design voltage V0 of each lamp bead:

m＝Vled/V0。

in some optional embodiments, when j + k is greater than or equal to i, the arrangement of the first lamp bead, the second lamp bead and the third lamp bead includes:

one or two lamp beads are randomly selected from the j second lamp beads and the k third lamp beads at each time, and the lamp beads are inserted between the two adjacent first lamp beads.

In the technical scheme, when the number of the first lamp beads is not more than the sum of the number of the second lamp beads and the number of the third lamp beads, all the first lamp beads are uniformly arranged, and then one or two of the rest lamp beads (the second lamp beads or the third lamp beads) are inserted between every two first lamp beads, so that the luminous flux of the LED lamp tube is uniform, the problem of facula is avoided, and the illumination effect is improved.

In some optional embodiments, when j + k is less than i, the arrangement of the first lamp bead, the second lamp bead and the third lamp bead includes:

the first lamp beads are uniformly arranged, and a second lamp bead or a third lamp bead is inserted between every two adjacent first lamp beads.

Among the above-mentioned technical scheme, when the quantity of first lamp pearl is greater than the quantity sum of second lamp pearl and third lamp pearl, with j first lamp pearl interval lamp pearl vacancy setting, then insert second lamp pearl or third lamp pearl on remaining lamp pearl vacancy, that is to say, inserted the weaker second lamp pearl of luminous flux or third lamp pearl between two strongest first lamp pearls of luminous flux for the luminous flux of LED fluorescent tube is even, avoids appearing the facula problem, has improved the illumination effect.

In some optional embodiments, when a ratio of the second luminous flux to the third luminous flux is n, n is greater than 1, and the arrangement manner of the first lamp bead, the second lamp bead and the third lamp bead includes:

the first lamp beads are uniformly arranged, and a second lamp bead is inserted between the two first lamp beads or

A third light bead, wherein,

is a rounded down value for n.

In the above technical scheme, when the ratio of the second conduction time to the third conduction time is n, the luminous flux of the second lamp bead can be regarded as approximately equal to

A third lamp bead, therefore, the first lamp beads are uniformly arranged, and a second lamp bead or a third lamp bead is inserted between the two first lamp beads

The third lamp beads enable the luminous flux of the LED lamp tube to be uniform, the problem of facula is avoided, and the illumination effect is improved.

In some optional embodiments, when the first luminous flux is equal to the sum of the second luminous flux and the third luminous flux, the arrangement of the first lamp bead, the second lamp bead and the third lamp bead includes:

and taking one second lamp bead and one third lamp bead as a repeating unit, wherein the first lamp beads are uniformly arranged, the repeating unit is inserted between two adjacent first lamp beads, and the rest second lamp beads or third lamp beads are inserted between two adjacent first lamp beads.

In some optional embodiments, the obtaining manner of the number i of the first lamp beads, the number j of the second lamp beads, and the number k of the third lamp beads includes:

determining a first breakover voltage V1, a second breakover voltage V2 and a third breakover voltage V3 according to the required power factor value; in each alternating-current half wave, when the input voltage reaches a first breakover voltage V1, the first lamp string is lightened; when the input voltage reaches the second breakover voltage V2, the first light string and the second light string are lightened; when the input voltage reaches a third breakover voltage V3, the first light string, the second light string and the third light string are lightened;

the number i of the first lamp beads is determined as V1/V0, the number j of the second lamp beads is determined as (V2-V1)/V0, and the number k of the third lamp beads is determined as (V3-V2)/V0.

Among the above-mentioned technical scheme, when first on-time equals approximately to second on-time and third on-time sum, the luminous flux that can see a first lamp pearl equals approximately the luminous flux sum of a second lamp pearl and a third lamp pearl, regard a second lamp pearl and a third lamp pearl as a repeating unit, first lamp pearl evenly arranged, repeating unit inserts between two adjacent first lamp pearls, remaining second lamp pearl or third lamp pearl insert between two adjacent first lamp pearls, make the luminous flux of LED fluorescent tube even, avoid the facula problem, the illumination effect has been improved.

The design method of the multi-segment linear constant current LED lamp provided by the embodiment of the application comprises the following steps:

calculating to obtain the total number m of the lamp beads according to the load LED voltage Vled and the design voltage V0 of each lamp bead;

determining a first breakover voltage V1, a second breakover voltage V2 and a third breakover voltage V3 according to the required power factor value; in each alternating-current half wave, when the input voltage reaches a first breakover voltage V1, the first lamp string is lightened; when the input voltage reaches a second breakover voltage V2, the first light string and the second light string are lightened; when the input voltage reaches a third breakover voltage V3, the first light string, the second light string and the third light string are lightened;

obtaining the number i = V1/V0 of the first lamp beads, the number j = (V2-V1)/V0 of the second lamp beads, and the number k = (V3-V2)/V0 of the third lamp beads according to the first conduction voltage V1, the second conduction voltage V2, the third conduction voltage V3, and the design voltage V0;

obtaining first conduction time according to the first conduction voltage, second conduction time according to the second conduction voltage and third conduction time according to the third conduction voltage by utilizing a relation function of the conduction time and the conduction voltage;

and arranging i first lamp beads, j second lamp beads and k third lamp beads on the lamp bead vacancy of the LED lamp tube according to the first conduction time, the second conduction time and the third conduction time in a mode of uniform luminous flux.

In the technical scheme, firstly, the total number m of the lamp beads is determined, then, a first breakover voltage V1, a second breakover voltage V2 and a third breakover voltage V3 are determined according to a required power factor value, and the quantity of the lamp beads is calculated according to the breakover voltages; calculating the conduction time according to the conduction voltage by using a relation function of the conduction time and the conduction voltage; and finally, arranging i first lamp beads, j second lamp beads and k third lamp beads on the lamp bead vacancy of the LED lamp tube according to the first conduction time, the second conduction time and the third conduction time in a mode of uniform luminous flux, so that the luminous flux of the LED lamp tube obtained by arrangement is uniform when the LED lamp tube emits light, the problem of light spots is avoided, and the illumination effect is improved.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

Fig. 1 is a schematic circuit connection diagram of a multi-segment linear constant current LED lamp according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram of a relationship between time and voltage in an ac half-wave according to the present embodiment;

fig. 3 is a schematic view of a first arrangement manner provided in this embodiment;

fig. 4 is a schematic diagram of a second arrangement manner provided in this embodiment;

FIG. 5 is a schematic view of a third arrangement provided in this embodiment;

FIG. 6 is a schematic diagram of a fourth arrangement provided in this embodiment;

fig. 7 is a schematic view of a fifth arrangement manner provided in this embodiment;

fig. 8 is a schematic view of a sixth arrangement manner provided in this embodiment;

fig. 9 is a schematic diagram of a possible circuit structure of a multi-segment linear constant current LED lamp according to an embodiment of the present disclosure.

An icon: the LED lamp comprises a rectifier module 1, a first lamp string 2, a first lamp bead 21, a second lamp string 3, a second lamp bead 31, a third lamp string 4, a third lamp bead 41 and a driving module 5.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

Referring to fig. 1, fig. 1 is a schematic circuit connection diagram of a multi-segment linear constant current LED lamp according to an embodiment of the present disclosure, where the multi-segment linear constant current LED lamp includes a rectifier module 1, an LED string and a driving module 5.

The input end of the rectification module 1 is connected with an alternating current power supply, the positive output end of the rectification module 1 is connected with the input end of the LED lamp string, and the negative output end of the rectification module 1 is grounded; the LED lamp string comprises a first lamp string 2, a second lamp string 3 and a third lamp string 4 which are connected in series; the first lamp string 2 comprises i first lamp beads 21, the second lamp string 3 comprises j second lamp beads 31, and the third lamp string 4 comprises k third lamp beads 41; when the LED lamp string is turned on, in an ac half-wave, the luminous flux of the first lamp bead 21 is a first luminous flux, the luminous flux of the second lamp bead 31 is a second luminous flux, and the luminous flux of the third lamp bead 41 is a third luminous flux; the output ends of the first lamp string 2, the second lamp string 3 and the third lamp string 4 are respectively connected with 3 input ends of the driving module 5; the driving module 5 is used for driving the first lamp string 2 to light up; or, the first light string 2 and the second light string 3 are driven to light up simultaneously; or, the first light string 2, the second light string 3 and the third light string 4 are driven to be simultaneously lightened; because the first light string, the second light string and the third light string are sequentially lightened, under the condition of constant current, the light-emitting time of the first light string, the second light string and the third light string is sequentially decreased progressively, so that the first luminous flux is larger than the second luminous flux and larger than the third luminous flux.

Wherein, the mode of arrangement of first lamp pearl 21, second lamp pearl 31 and third lamp pearl 41 does: i first lamp beads 21 are uniformly arranged, and at least one second lamp bead 31 and/or third lamp bead 41 is inserted between two adjacent first lamp beads 21.

Referring to fig. 2, fig. 2 is a schematic diagram showing a relationship between time and voltage in an ac half-wave after rectification. Along with the continuous rise of the voltage, in the first stage, the voltage reaches a first breakover voltage V1, and the first lamp string 2 is lightened through constant current; in the second stage, the voltage reaches a second breakover voltage V2, and the first lamp string 2 and the second lamp string 3 are lightened together through constant current; in the third stage, the voltage reaches the third on-voltage V3, and the first light string 2, the second light string 3, and the third light string 4 are lit up together by the constant current. As shown in the figure, as the input voltage increases to a decreasing ac half-wave, the first on-time t1 of the first string of lights 2 is longest, the second on-time t2 of the second string of lights 3 is the shortest, and the third on-time t3 of the third string of lights 4 is the shortest. As a specific example, suppose we set 87 lamp beads, the load voltage of each lamp bead is 3v, and the ratio of three lamp beads is 41:34:12, when the voltage reaches 123v, the first string light 2 lights up, when the voltage rises to 225v, the first string light 2 and the second string light 3 lights up, when the voltage rises to 261v, the first string light 2, the second string light 3 and the third string light 4 all lights up. This has the advantage that the start-up voltage of the first string of lights 2 is low, the start-up power of the second string of lights 3 is also reduced, the power factor value is increased, and the total harmonic distortion is reduced.

In the embodiment of the application, the multi-section linear constant-current LED lamp comprises a rectifying module 1, an LED lamp string and a driving module 5, the LED lamp string comprises a first lamp string 2, a second lamp string 3 and a third lamp string 4 which are connected in series, the first lamp string 2 comprises i first lamp beads 21, the second lamp string 3 comprises j second lamp beads 31, the third lamp string 4 comprises k third lamp beads 41, when the LED lamp string is turned on, in an alternating-current half-wave, the luminous flux of the first lamp beads 21 is a first luminous flux, the luminous flux of the second lamp beads 31 is a second luminous flux, and the luminous flux of the third lamp beads 41 is a third luminous flux, according to the first luminous flux, the second luminous flux and the third luminous flux, the i first lamp beads 21, the j second lamp beads 31 and the k third lamp beads 41 are arranged in a lamp bead vacancy of the LED lamp tube in a manner of uniform luminous flux, for example, the second lamp beads 31 or the third lamp beads 41 with lower luminous flux are inserted between the two first lamp beads 21 with stronger luminous flux, so that the luminance is uniform, the problem of the LED lamp tube is avoided, and the light spot is improved.

It should be clear that "LED fluorescent tube luminance is even" in this application a plurality of embodiments, it is as even as possible from the luminance that human eyes' perception reached, because the luminous flux of first lamp pearl 21, second lamp pearl 31 and third lamp pearl 41 is different, it is complete even to accomplish the luminance of every position of LED fluorescent tube, nevertheless, through inserting the lamp pearl that luminous flux is lower between the lamp pearl that luminous flux is stronger, perhaps regard a plurality of lamp pearls as the repetitive unit circulation arrangement, can make the luminance of LED fluorescent tube on the whole even.

In some optional embodiments, the sum of the i first lamp beads 21, the j second lamp beads 31, and the k third lamp beads 41 is m total number of lamp beads of the LED lamp string, and m lamp beads are arranged in m lamp bead vacant positions uniformly distributed in the LED lamp tube; the total number m of the lamp beads is calculated by the load LED voltage Vled and the design voltage V0 of each lamp bead:

m＝Vled/V0。

the input voltage may have a value different depending on the usage scenario, for example, an ac voltage of 220V, and an ac voltage of 110 to 130V may be used. Taking 220V ac as an example, the rectified peak value is 280V dc voltage because the voltage fluctuates, for example, to 200V ac voltage. Therefore, the LED on-voltage must be lower than 280V, as shown in the shaded portion of the figure, when the voltage is 270V, the LED is turned on for a certain time, if the LED on-voltage is greater than 280V, the LED cannot be turned on, and in order to reserve a certain on-time, the LED on-voltage can be set to be lower than 270V. And because the input total power is not less than 90% of the nominal power when the lowest input 200V alternating voltage is met, the LED generally selects the load LED voltage to be 250-270V. All values mentioned herein are ranges, which are determined by the customer or manufacturer in the actual production campaign. For example, the voltage of the load LED is selected to be 250-270V, the design voltage of each lamp bead is 3V, and in such a conversion way, 83-90 total lamp beads can be selected.

In some optional embodiments, the obtaining manner of the number i of the first lamp beads 21, the number j of the second lamp beads 31, and the number k of the third lamp beads 41 includes:

determining a first breakover voltage V1, a second breakover voltage V2 and a third breakover voltage V3 according to the required power factor value; in each alternating-current half wave, when the input voltage reaches a first breakover voltage V1, the first lamp string 2 is lightened; when the input voltage reaches the second breakover voltage V2, the first lamp string 2 and the second lamp string 3 are lightened; when the input voltage reaches the third on-voltage V3, the first light string 2, the second light string 3 and the third light string 4 are lightened;

the number i of the first lamp beads 21 is determined as V1/V0, the number j of the second lamp beads 31 is determined as (V2-V1)/V0, and the number k of the third lamp beads 41 is determined as (V3-V2)/V0.

In the embodiment of the application, since the power factor value is related to each segment of conduction voltage, the closer the waveform of the conduction time and the voltage is to a half-wave sine waveform, the higher the power factor value is, and therefore, the first conduction voltage V1, the second conduction voltage V2 and the third conduction voltage V3 can be determined according to the power factor value, so that the number of the first lamp beads 21, the second lamp beads 31 and the third lamp beads 41 can be calculated.

In some optional embodiments, when j + k is greater than or equal to i, the arrangement of the first lamp bead 21, the second lamp bead 31, and the third lamp bead 41 includes:

one or two lamp beads are randomly selected from the j second lamp beads and the k third lamp beads at each time, and the lamp beads are inserted between the two adjacent first lamp beads.

As shown in fig. 3, a third lamp bead and a second lamp bead are inserted between the first two first lamp beads 21.

Or, as shown in fig. 4, a second lamp bead is inserted between the first two first lamp beads 21, and two third lamp beads are inserted between the second two first lamp beads 21.

In the embodiment of the application, insert the lamp pearl of the weaker one or two lamp pearls of luminous flux between two first lamp pearls for the luminous flux of LED fluorescent tube is more even, avoids appearing the facula problem, has improved the illumination effect.

In some optional embodiments, when j + k is less than i, the arrangement manner of the first lamp bead 21, the second lamp bead 31, and the third lamp bead 41 includes:

the first lamp beads 21 are uniformly arranged, and a second lamp bead 31 or a third lamp bead 41 is inserted between two adjacent first lamp beads 21.

In the embodiment of the present application, when the number of the first lamp beads 21 is greater than the sum of the numbers of the second lamp beads 31 and the third lamp beads 41, the j first lamp beads 21 are arranged by separating one lamp bead vacancy, and then the second lamp beads 31 or the third lamp beads 41 are inserted into the remaining lamp bead vacancies, that is, the second lamp beads 31 or the third lamp beads 41 with weaker light flux are inserted between the two first lamp beads 21 with the strongest light flux, as shown in fig. 5, the 4 first lamp beads 21 are arranged by separating one lamp bead vacancy for a total of three lamp bead vacancies, then the second lamp beads 31 are inserted into the first lamp bead vacancy, the third lamp beads 41 are inserted into the second lamp bead vacancy, and the third lamp beads 41 are inserted into the third lamp bead vacancy.

In some optional embodiments, the arrangement of the first lamp bead 21, the second lamp bead 31 and the third lamp bead 41 includes:

according to the first conduction time, the second conduction time and the third conduction time, i first lamp beads 21, j second lamp beads 31 and k third lamp beads 41 are arranged on the lamp bead vacant positions of the LED lamp tube in a uniform luminous flux mode;

obtaining first conduction time according to the first conduction voltage, second conduction time according to the second conduction voltage and third conduction time according to the third conduction voltage by utilizing a relation function of the conduction time and the conduction voltage; and a ratio of the first on-time, the second on-time, and the third on-time is equal to a ratio of the first luminous flux, the second luminous flux, and the third luminous flux.

In the embodiment of the application, because the current that every lamp pearl passes through is invariable, and the factor that influences the luminous flux size of every lamp pearl is the on-time of this lamp pearl promptly, consequently, first on-time, second on-time and third on-time arrange i first lamp pearl 21, j second lamp pearl 31 and k third lamp pearl 41 on the lamp pearl vacancy of LED fluorescent tube according to the even mode of luminous flux.

In some optional embodiments, when the ratio of the second on-time to the third on-time is n, n is greater than 1, and the arrangement manner of the first lamp bead 21, the second lamp bead 31, and the third lamp bead 41 includes:

the first lamp beads 21 are uniformly arranged, and a second lamp bead 31 or a second lamp bead 21 is inserted between the two first lamp beads 21

A third light bead 41, wherein,

is n downThe rounded value is taken.

For example: in one embodiment of the method of manufacturing the optical fiber,

when the value of (2) is 2, as shown in fig. 6, one second lamp bead 31 is inserted between the first two first lamp beads 21, and 2 third lamp beads 41 are inserted between the second two first lamp beads 21.

In another embodiment of the method, the first and second embodiments,

when the value of (3) is 3, as shown in fig. 7, one second lamp bead 31 is inserted between the first two first lamp beads 21, and 3 third lamp beads 41 are inserted between the second two first lamp beads 21.

In the embodiment of the present application, when the ratio of the second on-time to the third on-time is n, it can be regarded that the luminous flux of the second lamp bead 31 is approximately equal to

A third lamp bead 41, therefore, the first lamp beads 21 are uniformly arranged, and a second lamp bead 31 or a third lamp bead is inserted between the two first lamp beads 21

And the third lamp beads 41 enable the luminous flux of the LED lamp tube to be uniform, the problem of facula is avoided, and the illumination effect is improved.

In some optional embodiments, when the first conduction time is equal to the sum of the second conduction time and the third conduction time, the arrangement modes of the first lamp bead 21, the second lamp bead 31 and the third lamp bead 41 include:

one second lamp bead 31 and one third lamp bead 41 are used as a repeating unit, the first lamp beads 21 are uniformly arranged, the repeating unit is inserted between two adjacent first lamp beads 21, and the rest second lamp beads 31 or third lamp beads 41 are inserted between two adjacent first lamp beads 21. For example: as shown in fig. 8, three first beads 21 are uniformly arranged at two bead spaces, and the first two bead spaces are inserted into the repeating unit (i.e. the first second bead 31 and the first third bead 41) occupying the two bead spaces. The latter two bead vacancies insert the repeat units (i.e., second bead 31 and second third bead 41) that occupy the two bead vacancies.

In the embodiment of the application, when the first on-time is approximately equal to the sum of the second on-time and the third on-time, the luminous flux of one first lamp bead 21 can be seen to be approximately equal to the sum of the luminous fluxes of one second lamp bead 31 and one third lamp bead 41, one second lamp bead 31 and one third lamp bead 41 are taken as a repeating unit, the first lamp beads 21 are uniformly arranged, the repeating unit is inserted between two adjacent first lamp beads 21, the remaining second lamp beads 31 or third lamp beads 41 are inserted between two adjacent first lamp beads 21, so that the luminous flux of the LED lamp tube is uniform, the problem of light spots is avoided, and the illumination effect is improved.

Referring to fig. 9, fig. 9 is a schematic diagram of a possible circuit structure of a multi-segment linear constant current LED lamp according to an embodiment of the present disclosure, in which a driving chip is adopted in a driving module in this embodiment, where the driving chip is a chip MT7605B, output ends of the first light string 2, the second light string 3, and the third light string 4 are respectively connected to a first input end D1, a second input end D2, and a third input end D3 of the driving chip, and the third input end D3 of the driving chip is further connected to a first resistor R _LN The LN terminal of the driving chip is connected to the GND terminal of the driving chip, and the CS terminal of the driving chip passes through the second resistor R _CS And then grounded.

The design method of the multi-segment linear constant-current LED lamp provided by the embodiment of the application comprises the following steps:

calculating to obtain the total number m of the lamp beads according to the load LED voltage Vled and the design voltage V0 of each lamp bead; after the total number of the designed lamp beads is obtained, m uniform lamp bead vacant positions can be designed according to the length of the lamp tube, and each lamp bead vacant position is used for placing one lamp bead.

Determining a first conduction voltage V1, a second conduction voltage V2 and a third conduction voltage V3 according to the required power factor value; in each alternating-current half wave, when the input voltage reaches a first breakover voltage V1, the first lamp string 2 is lightened; when the input voltage reaches the second breakover voltage V2, the first lamp string 2 and the second lamp string 3 are lightened; when the input voltage reaches the third on-voltage V3, the first light string 2, the second light string 3, and the third light string 4 are lighted;

obtaining the number i = V1/V0 of the first lamp beads 21, the number j = (V2-V1)/V0 of the second lamp beads 31, and the number k = (V3-V2)/V0 of the third lamp beads 41 according to the first conduction voltage V1, the second conduction voltage V2, the third conduction voltage V3, and the design voltage V0;

obtaining first conduction time according to the first conduction voltage, obtaining second conduction time according to the second conduction voltage, and obtaining third conduction time according to the third conduction voltage by using a relation function y = Asin (ω x) of the conduction time and the conduction voltage, wherein x represents abscissa time and y represents ordinate voltage;

and arranging i first lamp beads 21, j second lamp beads 31 and k third lamp beads 41 on the lamp bead vacancy of the LED lamp tube according to the first conduction time, the second conduction time and the third conduction time in a mode of uniform luminous flux.

In the embodiment of the application, firstly, the total number m of the lamp beads is determined, then, a first breakover voltage V1, a second breakover voltage V2 and a third breakover voltage V3 are determined according to a required power factor value, and the number of the lamp beads is calculated according to the breakover voltages; calculating the conduction time according to the conduction voltage by using a relation function of the conduction time and the conduction voltage; finally, according to the first conduction time, the second conduction time and the third conduction time, i first lamp beads 21, j second lamp beads 31 and k third lamp beads 41 are arranged on the vacant positions of the lamp beads of the LED lamp tube in a mode that luminous flux is uniform, so that the luminous flux of the LED lamp tube obtained by arrangement is uniform when the LED lamp tube emits light, the problem of facula is avoided, and the illumination effect is improved.

In some alternative embodiments, the design method comprises:

1. and determining the value range of the load voltage according to the input voltage, namely the total voltage of the series-connected LED lamp beads.

2. And determining the value range of the first conduction voltage and the number of the first lamp beads 21 according to the requirements of the PF value and the THD value.

3. The ratio of the second luminous flux of the second lamp beads 31 to the third luminous flux of the third lamp beads 41 is set. Since the current through the LEDs is the same and the luminous flux is proportional to the on-time, the second on-time and the third on-time are determined, the ratio of the second on-time to the third on-time being the ratio of the second luminous flux to the third luminous flux.

4. Determining the value ranges of the second breakover voltage and the third breakover voltage:

according to the period formula of the sine function, y = Asin (ω x), wherein x represents abscissa time, and y represents ordinate voltage, the second on-time and the third on-time can be determined through the previous step, and therefore the value ranges of the second on-voltage and the third on-voltage are obtained. Further, the quantity ranges of the second lamp beads 31 and the third lamp beads 41 are determined according to the second conduction voltage and the third conduction voltage.

5. And selecting the final lamp bead proportion according to the parameters.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.

In addition, units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist alone, or two or more modules may be integrated to form an independent part.

In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (8)

1. A multi-section linear constant current LED lamp is characterized by comprising an LED lamp string and a driving module;

the input end of the LED lamp string is connected with a power supply rectified by an alternating current power supply;

the LED lamp string comprises a first lamp string, a second lamp string and a third lamp string which are connected in series; the first lamp string comprises i first lamp beads, the second lamp string comprises j second lamp beads, and the third lamp string comprises k third lamp beads; when the LED lamp string is lighted, in an alternating-current half-wave, the luminous flux of the first lamp bead is a first luminous flux, the luminous flux of the second lamp bead is a second luminous flux, the luminous flux of the third lamp bead is a third luminous flux, and the first luminous flux is greater than the second luminous flux and greater than the third luminous flux;

the output ends of the first light string, the second light string and the third light string are respectively connected with the first input end, the second input end and the third input end of the driving module, and the output end of the driving module is grounded;

the driving module is used for sequentially driving the first light string, the second light string and the third light string to light;

wherein, the arrangement mode of first lamp pearl, second lamp pearl and third lamp pearl does: i first lamp pearls are evenly arranged, and at least one second lamp pearl and/or third lamp pearl are used for being inserted between two adjacent first lamp pearls.

2. The multi-segment linear constant current LED lamp of claim 1, further comprising a rectifying module;

the input end of the rectifying module is connected with an alternating current power supply, the output positive end of the rectifying module is connected with the input end of the LED lamp string, and the output negative end of the rectifying module is grounded.

3. The multi-segment linear constant current LED lamp of claim 1, wherein the driving module comprises a driving chip;

the output end of first lamp cluster, second lamp cluster and third lamp cluster is connected respectively driver chip's first input end, second input end and third input end, driver chip's third input end still is connected to through first resistance driver chip's LN end, driver chip's GND end ground connection, driver chip's CS end ground connection behind through the second resistance.

4. The multi-segment linear constant current LED lamp of claim 1, wherein the sum of the i first lamp beads, the j second lamp beads and the k third lamp beads is m total number of lamp beads of the LED lamp string, and the m lamp beads are arranged on m lamp bead vacant positions uniformly distributed in the LED lamp tube;

the total number m of the lamp beads is obtained by calculating the load LED voltage Vled and the design voltage V0 of each lamp bead:

m＝Vled/V0。

5. the multi-segment linear constant current LED lamp of claim 1, wherein when j + k is greater than or equal to i, the arrangement of the first lamp bead, the second lamp bead and the third lamp bead comprises:

one or two lamp beads are randomly selected from the j second lamp beads and the k third lamp beads at each time, and the lamp beads are inserted between the two adjacent first lamp beads.

6. The multi-segment linear constant current LED lamp of claim 1, wherein when j + k is smaller than i, the arrangement of the first lamp bead, the second lamp bead and the third lamp bead comprises:

the first lamp beads are uniformly arranged, and a second lamp bead or a third lamp bead is inserted between every two adjacent first lamp beads.

7. The multi-segment linear constant current LED lamp of claim 1, wherein when the ratio of the second luminous flux to the third luminous flux is n, n is greater than 1, and the arrangement of the first lamp bead, the second lamp bead and the third lamp bead comprises:

the first lamp beads are uniformly arranged, and a second lamp bead is inserted between the two first lamp beads or

A third light bead, wherein,

is a rounded down value for n.

8. The multi-segment linear constant current LED lamp of claim 1, wherein when the first luminous flux is equal to the sum of the second luminous flux and the third luminous flux, the arrangement of the first lamp bead, the second lamp bead and the third lamp bead comprises:

and taking one second lamp bead and one third lamp bead as a repeating unit, wherein the first lamp beads are uniformly arranged, the repeating unit is inserted between two adjacent first lamp beads, and the rest second lamp beads or third lamp beads are inserted between two adjacent first lamp beads.

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