CN108513396B - Control method for constant-power constant-current time-sharing multiplexing of LED lamp - Google Patents

Control method for constant-power constant-current time-sharing multiplexing of LED lamp Download PDF

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CN108513396B
CN108513396B CN201810259752.8A CN201810259752A CN108513396B CN 108513396 B CN108513396 B CN 108513396B CN 201810259752 A CN201810259752 A CN 201810259752A CN 108513396 B CN108513396 B CN 108513396B
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led lamp
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CN108513396A (en
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蒋伟楷
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Guangzhou Haoyang Electronic Co Ltd
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/345—Current stabilisation; Maintaining constant current
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines

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Abstract

The invention disclosesA control method for constant-power constant-current time-sharing multiplexing of an LED lamp comprises a switching power supply, N paths of LED drivers and N colors of LED lamps, wherein each color of LED lamp correspondingly provides a light color; the implementation steps for controlling the LED lamp constant-power constant-current time-sharing multiplexing comprise: determining the color type Y of the LED lamp needing to be driven to be lighted; determining the total output current peak value I of the LED lamps of Y colors in the step S11And total output power P1(ii) a Increasing the peak value of the total output current of the LED lamps with the Y colors in the step S2 to be I2(ii) a The peak value of the current output by the LED lamp of each color is I2Y, the output power of each color of LED lamp is (X multiplied by P)1) Y; controlling the PWM duty ratio of each color of the LED lamp in the step S3 to be 1/Y; the on times of the LED lamps of each color in step S4 are staggered. The LED lamp has the beneficial effect that the power of the LED lamp is constant and close to the total output power and the constant current when the LED lamp is used in a mixed mode in various color modes.

Description

Control method for constant-power constant-current time-sharing multiplexing of LED lamp
Technical Field
The invention relates to the field of control of power and current of an LED lamp, in particular to a constant-power constant-current time-sharing multiplexing control method of the LED lamp.
Background
Full-color LED lamps generally generate light of different colors by LED lamp beads of multiple colors through controlling the output brightness of the lamp beads of different colors. For example, the familiar tricolor LEDs (R/G/B) produce white light when their luminance ratio is 1:1: 1.
LED lamps are generally driven by a constant current, and the average LED current is changed by controlling the duty ratio of the LED current, so as to change the brightness of the LED, which is also called a digital dimming method. Duty cycle refers to the fraction of the time that is energized relative to the total time within a pulse cycle. However, there are some disadvantages in the actual use of the digital dimming method for LED lamps.
Fig. 1 is a circuit block diagram of a conventional LED lamp, which includes a switching power supply, a control chip, N LED drivers, and N LED lamps of corresponding colors. The switching power supply is responsible for converting alternating current into direct current for LED drive, and control chip is responsible for outputting PWM signal of different duty ratios for LED drive as the control signal that adjusts luminance, and LED drive produces the peak value and invariable and duty ratio adjustable current and transmits to the LED lamp, and the LED lamp is according to the light of different colors and different luminance of requirement output.
A PWM signal is a method of digitally encoding the level of an analog signal. Assuming that the time switch is on for 0.5 second and off for 0.5 second within 1 second, the lamp is on for 0.5 second and off for 0.5 second, and so on, the lamp will flash. If the frequency is adjusted higher, for example 1 ms, 0.5 s on, 0.5 s off, the frequency of lamp blinking is high. When the frequency of the light flicker exceeds a certain value, human eyes cannot feel the light flicker. Therefore, when the frequency is increased, human eyes cannot see the flicker of the lamp, and only see half of the original brightness of the lamp. Similarly, if the lamp is turned on for 0.1 ms and turned off for 0.9 ms within 1 ms, the brightness of the lamp is only one tenth of the original brightness. Keeping a certain voltage or current constant, but changing the on and off time within a certain period is equivalent to keeping on but changing the magnitude of the voltage or current.
Duty cycle refers to the proportion of the time that power is applied to the total time in a pulse cycle.
In the digital dimming method of the traditional LED lamp, the power of each path of LED is equal to about one N of the total output power. The digital dimming method requires that the peak current is not variable, and the output power corresponding to different color dimming can only be the percentage of the corresponding color to the total color number no matter one color dimming, two color dimming or multi-color dimming. For example, four colors are used for dimming, when the four colors are fully bright, the total output power is 100W, and the output power of each path is 25W; when one color is on, the maximum output power can only be 25W; when two colors are mixed for use, the maximum output power can only be 50W; the maximum output power can only be 75W when the three colors are mixed for use; only in the full bright mode, 100W full power output can be achieved. In this mode, it is impossible to use the mixed mode with an output power close to that of the full brightness of all colors.
Disclosure of Invention
In order to overcome the technical defects in the prior art, the invention provides a constant-power constant-current time-sharing multiplexing control method for an LED lamp, so that the power of the LED lamp is constant and close to the total output power and the constant current when the LED lamp is used in a mixed mode in various color modes.
In order to realize the purpose of the invention, the following technical scheme is adopted for realizing the purpose:
a control method for constant-power constant-current time-sharing multiplexing of an LED lamp comprises a switching power supply, N paths of LED drives and N colors of LED lamps which are connected with the N paths of LED drives in sequence in a one-to-one corresponding mode, wherein each color of LED lamp provides a light color correspondingly; wherein N is a natural number greater than 1; the implementation steps for controlling the LED lamp constant-power constant-current time-sharing multiplexing comprise:
s1: determining the color type Y of an LED lamp needing to be driven to be lighted, wherein Y is less than or equal to N;
s2: determining the total output current peak value I of the LED lamps of Y colors in the step S11And total output power P1(ii) a The peak value of the current output by the LED lamp of each color is I1Y, the output power of each color of LED lamp is P1/Y；
S3: increasing the peak value of the total output current of the LED lamps with the Y colors in the step S2 to be I2Wherein, I2=X×I1X is more than Y and less than or equal to N and is a natural number; the peak value of the current output by the LED lamp of each color is I2Y, the output power of each color of LED lamp is (X multiplied by P)1）/Y；
S4: controlling the PWM duty ratio of each color of the LED lamp in the step S3 to be 1/Y;
s5: the on times of the LED lamps of each color in step S4 are staggered.
In the invention, when the PWM of all colors reaches 100%, the luminous flux of the lamp is maximum and the power is maximum. However, in addition to controlling such a mode simultaneously for all colors, there are various control demands for full-color LEDs, such as single color, two colors, and three colors. Due to the constant current circuit, for the output of a single-color 100% duty ratio, the power and the brightness of the single-color LED can only be fully bright with all the color LEDs at the same time, and the power and the brightness of the single-color LED lamp occupying all the color LEDs are not greatly different. Similarly, for a 100% duty cycle output of multiple colors (not all colors), the power and brightness of the output of the multiple colors can only be a percentage of the output of all colors, and the output power of the power supply is still largely unused. If a lamp is required to control any color, the output power of the switching power supply is ensured to be constant when the duty ratio is maximum, and the traditional LED control method cannot be realized. In the invention, the constant-power constant-current time-sharing multiplexing of the LED lamp is controlled, the output power of the LED lamp of each color is improved and the output power is kept constant by improving the total peak current and the total output power output by the LED lamp, correspondingly reducing the PWM duty ratio of the driven LED lamp to be lightened and staggering the conduction time of the LED lamp of each color.
Further, the control method for staggering the on-time of the LED lamp of each color in step S5 includes: determining the turn-on time T of each of the Y colored LED lamps1、T2、T3……TYSaid T is1、T2、T3……TYThe two are staggered with each other.
Furthermore, the LED driving circuit further comprises a control chip, wherein the N paths of LED drivers are respectively connected with the control chip and are controlled by the control chip.
Further, the N paths of LED drives are respectively communicated with the switching power supply in parallel.
Furthermore, each of the N LED drivers is correspondingly connected to an LED lamp of one color, and each LED lamp of each color includes a plurality of LED lamp beads connected in series in sequence.
Compared with the prior art, the LED lamp constant-power constant-current time-sharing multiplexing control method has the beneficial effects of effectively controlling the LED lamp constant-power constant-current time-sharing multiplexing, effectively improving the output power when the LED lamp of each color is lightened and keeping the output power constant.
Drawings
Fig. 1 is a circuit block diagram of a conventional LED lamp.
Fig. 2 is a waveform diagram of current output when the conventional LED lamp outputs and drives 1-3 color LEDs to light.
Fig. 3 is a current variation diagram of the current peak value a of the driving circuit in the whole period T when the LED of one color is turned on.
Fig. 4 shows the PWM duty cycle variation and the on-time variation of each color LED when the two color LEDs are lit.
Fig. 5 shows the PWM duty ratio variation and the on-time variation of each color LED when the three color LEDs are lit.
Fig. 6 shows the PWM duty ratio variation and the on-time variation of each color LED when the N color LEDs are turned on.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
Examples
As shown in fig. 1, a control method for constant-power constant-current time-sharing multiplexing of an LED lamp includes a switching power supply, N-way LED drivers, which are connected in sequence, and are LED driver 1, LED driver 2, and LED driver 3 … …, respectively; the LED lamps with N colors are respectively connected with the N paths of LED drivers in a one-to-one correspondence mode and respectively provide a light color for the first color LED, the second color LED and the third color LED … … with the Nth color LED, and the LED lamp with each color is correspondingly provided with one light color;
wherein N is a natural number greater than 1;
the N paths of LED drivers are respectively connected with the control chip and are controlled by the control chip;
the N paths of LED drives are respectively communicated with the switching power supply in parallel;
each LED drive in the N LED drives is correspondingly connected with an LED lamp with one color, and each LED lamp with one color comprises a plurality of LED lamp beads which are sequentially connected in series;
the implementation steps for controlling the LED lamp constant-power constant-current time-sharing multiplexing comprise:
s1: determining the color type Y of an LED lamp needing to be driven to be lighted, wherein Y is less than or equal to N;
s2: determining the total output current peak value I of the LED lamps of Y colors in the step S11And total output power P1(ii) a The peak value of the current output by the LED lamp of each color is I1Y, the output power of each color of LED lamp is P1/Y；
S3: increasing the peak value of the total output current of the LED lamps with the Y colors in the step S2 to be I2Wherein, I2=X×I1X is more than Y and less than or equal to N and is a natural number; the peak value of the current output by the LED lamp of each color is I2Y, the output power of each color of LED lamp is (X multiplied by P)1）/Y；
S4: controlling the PWM duty ratio of each color of the LED lamp in the step S3 to be 1/Y;
s5: the on times of the LED lamps of each color in step S4 are staggered.
The control method for staggering the on-time of the LED lamp of each color in step S5 includes: determining the turn-on time T of each of the Y colored LED lamps1、T2、T3……TYSaid T is1、T2、T3……TYThe two are staggered with each other.
In step S4, for example: firstly, when the LED lamp of one color is controlled to be turned on, that is, Y =1, the PWM duty cycle of the LED lamp of one color is 1/Y =1/1=1, that is, the PWM duty cycle is 100%, because the output power of the LED lamp is increased to the original X times in step S3, that is, the output power of the LED lamp is (X × P) at this time1）/Y=（X×P1）/1=X×P1。
Secondly, when the LED lamps of two colors are only required to be controlled to be turned on, that is, Y =2, the PWM duty cycle of the LED lamp of each color is 1/Y =1/2=0.5, that is, the PWM duty cycle is 50%, since the output power of the LED lamp is increased to the original X times in step S3, that is, the output power of the LED lamp is (X × P) at this time1）/Y=（X×P1) And 2, namely the output power of the LED lamps of the two colors is X/2 times of that of the LED lamps without increasing the output peak current.
③ when we need to control the LED lamps of three colors to light, i.e. Y =3, the PWM duty cycle of the LED lamp of each color is 1/Y =1/3=033, i.e. the PWM duty ratio is 33%, since the output power of the LED lamp is increased to X times in step S3, i.e. the output power of the LED is (X × P) at this time1）/Y=（X×P1) And 3, namely the output power of the LED lamps of the two colors is X/3 times of that of the LED lamps without increasing the output peak current.
Fourthly, when the LED lamps with Y colors need to be controlled to be turned on, the PWM duty ratio of the LED lamp with each color is 1/Y, and the output power of the LED lamp is increased to the original X times in the step S3, namely the output power of the LED lamp is (X multiplied by P) at the moment1) and/Y, namely the output power of the LED lamps of the two colors is X/Y times of that of the LED lamps without increasing the output peak current.
Therefore, if we control X to be larger than Y, we can ensure that the output power and brightness of the LED lamp of each color combination are larger than the original output power and brightness.
Meanwhile, in order to avoid the technical problem that the instantaneous current of the switching power supply is too large when the output power and the peak current are increased, in step S5, the on-time of the LED lamp of each color in step S4 is staggered.
As shown in fig. 2, for example: when the LED lamps of 1-3 colors are controlled to be turned on, namely Y =1 and N =3, the output current of each color is set to be 1A when the peak current is not increased originally, and then the total output current I is obtained1=3 × 1=3A, the total peak current is increased by 3 times as much as the original peak current, that is, X =3, and the increased peak current I2=X×I1=3 × 3= 9A. When the conduction time of the LED lamp of each color is not staggered, the variation range of the peak current output by the switching power supply is 0-9A, and the peak current output by the switching power supply is 3 times larger than the original peak current output by the switching power supply, so that the problem that the instantaneous current of the switching power supply is too large is easily caused.
According to the invention, the technical problem of excessive instantaneous current of the switching power supply is solved by staggering the conduction time of the LED lamps of each color.
As shown in fig. 3, when the LED lamp of one color is controlled to be lit, the peak value of the current of the driving circuit is 1A, and the PWM duty ratio of the LED lamp of one color is 1/Y =1/1=1, that is, the duty ratio of the output current is 100% output during the whole period T.
As shown in fig. 4, when it is necessary to control the lighting of the LED lamps of two colors, the PWM duty ratio of each color is specified to be 1/Y =1/2=0.5, that is, the PWM duty ratio of each color output power is 50% in the entire period T, and the on times of each color are staggered. As shown, the LED lamp of the first color has a turn-on time T1Is 0-T/2 and T-3T/2, and the conduction time of the LED lamp with the second color is T2T/2-T and 3T/2-2T, and the current waveform after the two colors are mixed is also 100 percent output.
As shown in fig. 5, when it is necessary to control the lighting of the LED lamps of 3 colors, the PWM duty ratio of each color is specified to be 1/Y =1/3=0.33, that is, the PWM duty ratio of each color output power is 33% in the entire period T, and the on time of each color is shifted. As shown, the LED lamp of the first color has a turn-on time T1Is 0-T/3 and T-4T/3, and the conduction time of the LED lamp with the second color is T2Is T/3-2T/3 and 4T/3-5T/3, and the conduction time of the LED lamp with the third color is T 32T/3-T and 5T/3-2T, and the current waveform after the three colors are mixed is also 100 percent output.
As shown in fig. 6, when it is necessary to control the lighting of the LED lamps of n colors, the PWM duty ratio of each color is specified to be 1/Y =1/n, that is, the PWM duty ratio of each color output power is specified to be 1/n throughout the period T, and the on times of each color are staggered. As shown, the LED lamp of the first color has a turn-on time T1Is 0-T/n and T- (1 + 1/n) T, and the conduction time of the LED lamp with the second color is T2Is T/n-2T/n and (1 + 1/n) T- (1 + 2/n) T, and the conduction time of the LED lamp with the third color is T3Is 2T/n-3T/n and (1 + 2/n) T- (1 + 3/n) T, the conduction time T of the LED lamp with the nth colorNThe current waveforms of the mixed (1-1/n) T-T and (2-1/n) T-2T, n colors are also 100% output.
In summary, the invention improves the output power of the LED lamp of each color by improving the output peak current of the LED lamp, controlling the PWM duty ratio of the LED lamp of each color, and staggering the on-time of the LED lamp of each color, and has the beneficial effect of effectively improving the on-brightness of the LED lamp.

Claims (4)

1. A control method for constant-power constant-current time-sharing multiplexing of an LED lamp is characterized by comprising a switching power supply, N paths of LED drives and N colors of LED lamps which are connected with the N paths of LED drives in sequence in a one-to-one correspondence mode, wherein each color of LED lamp provides a light color correspondingly; wherein N is a natural number greater than 1; the implementation steps for controlling the LED lamp constant-power constant-current time-sharing multiplexing comprise:
s1: determining the color type Y of an LED lamp needing to be driven to be lighted, wherein Y is less than or equal to N;
s2: determining the total output current peak value I1 and the total output power P1 of the LED lamps of the Y colors in the step S1; at the moment, the peak value of the current output by the LED lamp of each color is I1/Y, and the output power of the LED lamp of each color is P1/Y;
s3: increasing the peak value of the total output current of the LED lamps with the Y colors in the step S2 to be I2, wherein I2 is X × I1, Y is more than X and is less than or equal to N, and X is a natural number; at the moment, the current peak value output by the LED lamp of each color is I2/Y, and the output power of the LED lamp of each color is (X multiplied by P1)/Y;
s4: controlling the PWM duty ratio of each color of the LED lamp in the step S3 to be 1/Y;
s5: staggering the on-time of the LED lamp of each color in step S4;
the control method for staggering the on-time of the LED lamp of each color in step S5 includes: determining the conduction time T1, T2 and T3 … … TY of each color of LED lamps of Y colors, wherein the conduction time T1, the conduction time T2 and the conduction time T3 … … TY of each color of LED lamps of Y colors are staggered with each other; the constant-power constant-current time-sharing multiplexing of the LED lamp is controlled by improving the total peak current and the total output power output by the LED lamp, correspondingly reducing the PWM duty ratio of the driven LED lamp to be lighted and staggering the conduction time of the LED lamp of each color, and the output power and the constant holding power of the LED lamp of each color when the LED lamp of each color is lighted are improved.
2. The method according to claim 1, further comprising a control chip, wherein the N LED drivers are respectively connected to the control chip and controlled by the control chip.
3. The method according to claim 1, wherein the N LED drivers are respectively connected in parallel to a switching power supply.
4. The method according to claim 1, wherein each of the N LED drivers is connected to a corresponding LED lamp of one color, and each LED lamp of each color comprises a plurality of LED lamp beads connected in series in sequence.
CN201810259752.8A 2018-03-27 2018-03-27 Control method for constant-power constant-current time-sharing multiplexing of LED lamp Active CN108513396B (en)

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PCT/CN2019/072689 WO2019184567A1 (en) 2018-03-27 2019-01-22 Method for controlling led lamp constant-power constant-current time division multiplexing

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CN108513396B (en) * 2018-03-27 2020-10-23 广州市浩洋电子股份有限公司 Control method for constant-power constant-current time-sharing multiplexing of LED lamp
CN109712560A (en) * 2019-02-20 2019-05-03 深圳市富满电子集团股份有限公司 A kind of driving control system of LED display module
CN112969261A (en) * 2021-02-06 2021-06-15 上海福宇龙汽车科技有限公司 Time-sharing driving circuit and method for multiple paths of LED lamps
CN113692088A (en) * 2021-08-13 2021-11-23 广州腾龙健康实业股份有限公司 LED lamp system and LED lamp control method for reducing instantaneous power
CN116647956B (en) * 2023-06-12 2024-05-03 钰泰半导体股份有限公司 Parallel time-sharing multiplexing brightness control system based on series switch

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