CN102421230B - A kind of LED color adjustment driver - Google Patents
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Abstract
The invention discloses a kind of LED color adjustment driver, by time division multiplexing control module, light source module control signal corresponding for three colors was split in the time, make them in any one moment, one is had to be in high level at the most, power output module is road outputting drive voltage or an electric current at the most, drive corresponding light source module luminous, the electric energy provided by power supply changeover device is like this distributed to different branch roads in different time sections successively and is used, the problem of the power supply changeover device overload brought is superposed with regard to there is not power peak, thus power supply changeover device power configuration can be reduced to 1/3rd of prior art.The reduction of power supply changeover device power, means that its volume and weight all reduces, thus saves the cost of LED.
Description
Technical Field
The invention belongs to the technical field of LED lamp control, and particularly relates to an LED lamp color adjusting driver.
Background
As a new light source with high benefit, the LED lamp is widely used in the fields of business, industry, roads, advertising lamp boxes, etc. due to its advantages of long service life, low energy consumption, energy saving and environmental protection.
With the wide application of LED lamps, people have higher and higher requirements on LED lamps, and multiple control modes from single brightness adjustment to color adjustment are formed. The control modes adopted for color adjustment mainly include linear dimming in an analog mode and PWM (Pulse Width Modulation) dimming in a digital mode.
The driving aspect of the color adjustment of the LED lamp is not particularly limited, and the LED lamp mainly aims at realizing the function, and generally adopts a common anode or common cathode structure, and uses a constant voltage mode to supply power, and uses a PWM signal to control the color change. However, for the application occasions with fixed light source structures, the color change of the light source is mainly controlled by PWM in a driving mode of independent constant current of each group.
For the LED lamp with color modulation controlled by PWM signal, in order to avoid the problem of overload of the power converter caused by the superposition of power peak values, the sum of the maximum powers of the LED light source modules with three colors when they work alone is usually used as the power of the power converter of the LED lamp. However, the maximum value of the actual power consumption of the LED lamp is only about one third of the power converter, so that the power of the power converter is configured based on the sum of the powers of the three color light source modules when operating alone, which results in the waste of the power converter, and at the same time, the power converter has a large volume, a heavy weight, and a relatively high cost. Moreover, in general, the power converter is installed in the lamp housing, and the power converter occupies most space of the lamp, so that the whole LED lamp has large volume, weight and cost. Especially for outdoor LED lamps (such as street lamps), the increase of the volume and weight of the lamp has a great influence on the cost of the product. Because, not only is more material and human resources spent in the manufacturing process, but also the associated products involved in the later installation process, such as lamp posts used as support fixtures, are extremely demanding in terms of their strength properties, otherwise LED fixtures of such weight and volume cannot be supported. In addition, in coastal areas where typhoons frequently occur, the LED lamp has great potential safety hazards due to overlarge volume and weight. Therefore, how to obtain a power converter with small size, light weight and low cost and how to utilize the power converter to achieve the purpose of dimming an LED lamp is a problem to be solved. Chinese patent CN 101196276a discloses a program-controlled color-mixing LED projector, which aims to solve the technical problem of how to adjust the output of specific color and brightness of LED lamp set by PWM pulse width modulation signal. Chinese patent CN 201515523U discloses a driving device for light emitting diode LED, and discloses that the problems of excessive instantaneous current and significant electromagnetic interference in the circuit caused by the traditional LED driving method are reduced by a "sectional lighting" method, so as to reduce the instantaneous current in the circuit and reduce the output power of the power supply. Chinese patent CN 102087834a discloses an LED driving circuit, which solves the technical problems: the method can reduce the structural cost and size of the scanning display. None of the above-mentioned references relate to the problem and related technical means of how to obtain a compact, lightweight, low-cost power converter and how to use the compact power converter to achieve dimming of LED lamps.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an LED lamp color adjusting driver which enables the power of a power converter to be equivalent to the maximum value of the actual power consumption of an LED lamp.
In order to achieve the above object, the present invention provides a color adjustment driver for an LED lamp, comprising:
the time division multiplexing control module is provided with three registers and a communication interface, the three registers are respectively used for storing the turn-on time of the red, green and blue light source modules, the communication interface is connected with the color modulation control circuit, receives the turn-on time data of the red, green and blue light source modules from the color modulation control circuit, and is used for adjusting and updating the turn-on time of the red, green and blue light source modules stored by the three registers to realize the color adjustment of the LED lamp; three paths of light source module control signals are output and respectively correspond to the control of three colors of red, green and blue;
in the control period, firstly changing the control signal of the light source module corresponding to the first color from low level to high level and maintaining the corresponding on-time, then changing the control signal of the light source module corresponding to the second color from low level to high level and maintaining the corresponding on-time after the control signal of the light source module corresponding to the first color is changed to low level, and finally changing the control signal of the light source module corresponding to the third color from low level to high level and maintaining the corresponding on-time after the control signal of the light source module corresponding to the second color is changed to low level;
the power output module outputs driving voltage or current to drive the corresponding light source module to emit light when the control signal of the light source module corresponding to a certain color is at a high level;
the time division multiplexing control module and the power output module are connected with a power converter, and the power converter provides a direct current power supply for the time division multiplexing control module and the power output module.
The purpose of the invention is realized as follows:
the LED lamp color adjusting driver divides the light source module control signals corresponding to three colors in time through the time division multiplexing control module, so that at most one of the light source module control signals is in a high level at any moment, the power output module outputs driving voltage or current at most one path to drive the corresponding light source module to emit light, and thus, the electric energy provided by the power converter is sequentially distributed to different branches for use at different time periods, the problem of power converter overload caused by power peak value superposition does not exist, and the power configuration of the power converter can be reduced to one third of the prior art. The reduction in power of the power converter means that both its volume and weight are reduced, thus saving the cost of the LED lamp.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a color adjusting driver of an LED lamp according to the present invention;
FIG. 2 is a schematic diagram of one embodiment of the time division multiplexing control module shown in FIG. 1;
FIG. 3 is a functional block diagram of one embodiment of the power output module shown in FIG. 1;
FIG. 4 is a functional block diagram of another embodiment of the power output module shown in FIG. 1;
FIG. 5 is a timing diagram of an embodiment of light source module control signals in different color states.
Detailed Description
The following description of the embodiments of the present invention is provided in order to better understand the present invention for those skilled in the art with reference to the accompanying drawings. It is to be expressly noted that in the following description, a detailed description of known functions and designs will be omitted when it may obscure the subject matter of the present invention.
Fig. 1 is a schematic diagram of an embodiment of a color adjusting driver of an LED lamp according to the present invention.
In the present embodiment, as shown in fig. 1, the LED lamp color adjusting driver 2 includes a time division multiplexing control module 201 and a power output module 202.
The time division multiplexing control module 201 has three light source module control signals PMW1, PMW2, and PMW3 output, which correspond to the control of three colors of red, green, and blue, respectively.
The power output module 202 outputs a driving voltage or current to drive the corresponding light source module to emit light when the control signal of the light source module corresponding to a certain color is at a high level. When the light source module control signal PMW1 is at a high level, it outputs a driving voltage or current to drive the red light source module to emit light; when the light source module control signal PMW2 is at a high level, it outputs a driving voltage or current to drive the green light source module to emit light; when the light source module control signal PMW3 is at a high level, it outputs a driving voltage or current to drive the blue light source module to emit light.
The time division multiplexing control module 201 and the power output module 202 are both connected to the power converter 1, and the power converter 1 provides a direct current power supply for the time division multiplexing control module 201 and the power output module 202. In the present embodiment, the power converter 1 includes an AC-DC converter 101 and a plug 102; the plug 102 is a single-phase three-terminal plug, includes a live wire terminal L, a ground terminal E, and a zero line terminal N, and is connected to a power grid through a plug power converter 1 to obtain an ac power supply. The AC-DC converter 101 converts AC power obtained from the power grid into DC power, and supplies the DC power to the time division multiplexing control module 201 and the power output module 202. The structure and principle of the power converter belong to the prior art, and are not described in detail herein.
Fig. 2 is a schematic diagram of an embodiment of the time division multiplexing control module shown in fig. 1.
In the embodiment, as shown in fig. 2, the time division multiplexing control module 201 includes a micro processing unit (MCU)2011 and a DC-DC converter 2012; the micro-processing unit 2011 has three registers R1-R3 and a communication Interface, and in this embodiment, the communication Interface is a DALI Interface (Digital addressable lighting Interface).
The three registers R1-R3 are respectively used for storing the turn-on time of the red, green and blue light source modules, the communication interface is connected with the color modulation control circuit, receives the turn-on time DATA DATA of the red, green and blue light source modules from the color modulation control circuit, and is used for adjusting and updating the turn-on time of the red, green and blue light source modules stored in the three registers R1-R3 to realize the color adjustment of the LED lamp.
In this embodiment, the power converter 1 only outputs one power Vdd, and since it needs to provide power for the power output module at the same time, and the voltage value of the power Vdd is high, it needs to be stepped down to meet the requirement of the power needed by the micro-processing unit 2011, and the DC-DC converter 2012 steps down the power Vdd and then outputs the power Vdd as the power of the micro-processing unit 2011.
Fig. 3 is a functional block diagram of one embodiment of the power output module shown in fig. 1.
In this embodiment, as shown in fig. 3, the power output module 202 includes three constant current drivers Q1 to Q3, each of the constant current drivers Q1 to Q3 has a PWM dimming interface, and when a certain light source module control signal is at a high level, the connected constant current driver outputs a driving current and drives the corresponding light source module to emit light. In addition, the constant current driver is a constant current power supply with open circuit protection.
In the control period T, the light source module control signal PWM1 corresponding to the first color, red in this embodiment, is first changed from low level to high level and maintained for the corresponding on-time T1, then, after the light source module control signal PWM1 corresponding to the first color, red, is changed to low level, the light source module control signal PWM2 corresponding to the second color, green in this embodiment, is changed from low level to high level and maintained for the corresponding on-time T2, and finally, after the light source module control signal corresponding to the second color, green, is changed to low level, the light source module control signal PWM3 corresponding to the third color, blue is changed from low level to high level and maintained for the corresponding on-time T3.
As shown in fig. 1, the time division multiplexing control module 201 outputs three non-overlapping high-level light source module control signals PWM 1-PWM 3, and when the light source module control signal PWM1 is at a high level, the constant current driver Q1 outputs a driving current to drive the red light source module to emit light; when the light source module control signal PWM2 is at a high level, the constant current driver Q2 outputs a driving current to drive the green light source module to emit light; when the light source module control signal PWM3 is at a high level, the constant current driver Q3 outputs a driving current to drive the blue light source module to emit light, so that the power output of the power supply is distributed to the red light source module via the constant current driver Q1, the green light source module via the constant current driver Q2, and the blue light source module via the constant current driver Q3 at different time periods within the control period T.
The LED lamp color is adjusted by setting the on-time t 1-t 3 of the red, green and blue light source modules and controlling the high level time of the light source module control signals PWM1, PWM2 and PWM 3.
In this embodiment, the LED lamp is a color-tunable flat lamp with a power rating of 20W, the light source portion is composed of 14 strings of 24 red light source modules each composed of 0.06W single particles, 14 strings of 24 green light source modules each composed of 0.06W single particles, and 14 strings of 24 blue light source modules each composed of 0.06W single particles, and the three color light source modules are connected by independent loops.
Fig. 4 is a functional block diagram of another embodiment of the power output module shown in fig. 1.
In this embodiment, as shown in fig. 3, the power output module 202 includes a constant current driver 2021 and three switching tubes K1-K3, the constant current driver 202 is a constant current power supply with open circuit protection, the three switching tubes K1-K3 are respectively connected in series with the light source modules D1-D3 of the corresponding colors, and then are all connected to the output end of the constant current driver 2021, three light source module control signals PWM1, PWM2, and PWM3 are respectively connected to the control ends of the switching tubes K1-K3 of the corresponding colors, when a certain light source module control signal is at a high level, the switching tube connected to the certain light source module is turned on, and the output of the constant current driver drives the corresponding light source module to emit light through the switching tube. In this way, compared with the power output module shown in fig. 3, only one constant current driver is needed, so that the cost is greatly reduced.
FIG. 5 is a timing diagram of an embodiment of light source module control signals in different color states.
In the present embodiment, as shown in fig. 5, (a) to (f) are signal timing diagrams of light source module control signals PWM1, PWM2 and PWM3 outputted by the light source module time division multiplexing control module under different color states, i.e., white highlight, white half-bright, purple highlight, purple half-bright, red highlight and red half-bright. The on-time T1 corresponds to the high level time of the light source module control signal PWM1, the on-time T2 corresponds to the high level time of the light source module control signal PWM2, the on-time T3 is corresponding to the high level time of the PWM3, wherein T ═ 4ms is the PWM period.
Fig. 5(a) shows a timing chart of the time division multiplexing module in a white and high light state, where T1 is 4/3ms, T2 is 4/3ms, T3 is 4/3ms, and T1+ T2+ T3 is T, the sum of the output powers of the constant current drivers Q1 to Q3 is about 20W, the red light source module, the green light source module, and the blue light source module all operate at 1/3 power, and the power consumption of the light source module for each color is 6.67W.
Fig. 5(b) shows a timing diagram of the time division multiplexing module in a white half-bright state, where T1 is 2/3ms, T2 is 2/3ms, T3 is 2/3ms, and T1+ T2+ T3 is T/2, the sum of the output powers of the constant current drivers Q1 to Q3 is about 10W, the red light source module, the green light source module, and the blue light source module all operate at 1/6 power, and the power consumption of the light source module in each color is 3.33W. In addition, in the control time T, the high levels of the control signals PWM 1-PWM 3 of the light source modules are uniformly spaced, so that the stability of the output power of the power converter 1 can be further maintained.
Fig. 5(c) shows a timing chart of the time division multiplexing module in the purple highlight state, where T1 is 2ms, T2 is 0ms, T3 is 2ms, and T1+ T2+ T3 is T, the sum of the output powers of the constant current drivers Q1 and Q3 is about 20W, the red light source module and the blue light source module both operate at half power, that is, the power consumption is 10W, and the green light source module does not operate.
Fig. 5(d) shows a timing diagram of the time division multiplexing module in the purple half-bright state, where T1 is 1ms, T2 is 0ms, T3 is 1ms, and T1+ T2+ T3 is T/2, the sum of the output powers of the constant current drivers Q1 and Q3 is about 10W, the red light source module and the blue light source module both operate at 1/4 power, that is, the power consumption is 5W, and the green light source module does not operate.
Fig. 5(e) shows a timing chart of the red highlight time division multiplexing module, where T1 is 4ms, T2 is 0ms, T3 is 0ms, and T1+ T2+ T3 is T, the output power of the constant current driver Q1 is about 20W, the red light source module operates at full power, that is, the power consumption is 20W, and the green light source module and the blue light source module do not operate.
Fig. 5(f) shows a red half-bright time division multiplexing timing chart, where T1 is 2ms, T2 is 0ms, T3 is 0ms, and T1+ T2+ T3 is T/2, the output power of the constant current driver Q1 is about 10W, the red light source module operates at half power, that is, the power consumption is 10W, and the green light source module and the blue light source module do not operate.
Given the example of 6 color adjustments above, other color states can be adjusted by adjusting the high time of the light source module control signals PWM1, PWM2, and PWM3, i.e.: and changing the on-time t1, t2 and t3 to control the light emitting power of the red light source module, the green light source module and the blue light source module, so that the color is mixed into different color states. For a color adjustment, the on-times t1, t2, and t3 are changed while maintaining the brightness, but the sum of t1, t2, and t3 is maintained at a constant value.
Meanwhile, as can be seen from fig. 5, as long as the maximum power of the LED lamp is determined, the maximum power of each light source module is also determined, and the maximum power of the LED lamp is the same, because the maximum brightness during monochromatic light emission should be the same as the maximum brightness during three-color light emission, and no matter the color is adjusted, brightness conversion occurs.
In this embodiment, if the conventional driving method is adopted, the light source module control signals PWM1, PWM2 and PWM3 are all high level, and the power peaks are superimposed, and a 60W power converter is required. With the scheme of the invention, the power of the power converter is one third of that of the traditional scheme. In addition, the situation of power peak value superposition can not occur, and the output power is stable.
In the present embodiment, as shown in fig. 5, the high levels of the light source module control signals PWM 1-PWM 3 are uniformly spaced during the control time T, so as to further maintain the stability of the output power of the power converter 1.
The light source module control signal PWM signal adopts positive logic, takes high level as effective, controls the output of the power output module, and drives the light source modules of three colors to emit light.
Although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, and various changes may be made apparent to those skilled in the art as long as they are within the spirit and scope of the present invention as defined and defined by the appended claims, and all matters of the invention which utilize the inventive concepts are protected.
Claims (2)
1. A color adjusting driver of an LED lamp is characterized by comprising a time division multiplexing control module and a power output module,
wherein,
the time division multiplexing control module is provided with three registers and a communication interface, the three registers are respectively used for storing the turn-on time of the red, green and blue light source modules, and the communication interface is connected with the color modulation control circuit, receives the turn-on time data of the red, green and blue light source modules from the color modulation control circuit, and is used for adjusting and updating the turn-on time of the red, green and blue light source modules stored by the three registers to realize the color adjustment of the LED lamp; the time division multiplexing control module is provided with three paths of light source module control signals (PWM1, PWM2 and PWM3) for output, and comprises a first light source module control signal (PWM1), a second light source module control signal (PWM2) and a third light source module control signal (PWM3), which respectively correspond to the control of three colors of red, green and blue, so that the on-time of the red, green and blue light source modules can be changed when the color is adjusted, but the sum of the on-time of the red, green and blue light source modules maintains a constant value; the on-time T1 corresponds to the high-level time of the first light source module control signal (PWM1), the on-time T2 corresponds to the high-level time of the second light source module control signal (PWM2), the on-time T3 corresponds to the high-level time of the third light source module control signal (PWM3), T-4 ms is the PWM period,
t1 ═ 4/3ms, T2 ═ 4/3ms, T3 ═ 4/3ms, and T1+ T2+ T3 ═ T, this time is a white highlight state, the red light source module, green light source module, and blue light source module all operate at 1/3 power, or T1 ═ 2ms, T2 ═ 0ms, T3 ═ 2ms, and T1+ T2+ T3 ═ T, this time is a purple highlight state, the red light source module and blue light source module all operate at half power, green light source module does not operate, or T1 ═ 4ms, T2 ═ 0ms, T3 ═ 0ms, and T1+ T2+ T3 ═ T, this time is a red highlight state, the red light source module operates at full power, and the green light source module and blue light source module do not operate; or T1 ═ 2/3ms, T2 ═ 2/3ms, T3 ═ 2/3ms, and T1+ T2+ T3 ═ T/2, in this case, in a white semi-bright state, the red light source module, the green light source module, and the blue light source module all operate at 1/6 power, or T1 ═ 1ms, T2 ═ 0, T3 ═ 1ms, and T1+ T2+ T3 ═ T/2, in this case, in a purple semi-bright state, the red light source module and the blue light source module all operate at 1/4 power, the green light source module does not operate, or T1 ═ 2ms, T2 ═ 0, T3 ═ 0, and T1+ T2+ T3 ═ T/2, in this case, in a red semi-bright state, the red light source module operates at half power, and the green light source module does not operate at half power;
wherein,
in the control period, the high levels of the first light source module control signal (PWM1), the second light source module control signal (PWM2) and the third light source module control signal (PWM3) which respectively correspond to three colors are uniformly spaced, so that the stability of the output power of the power converter is kept; in the control period, firstly changing the light source module control signal corresponding to the first color from low level to high level and maintaining the corresponding on-time, then changing the light source module control signal corresponding to the second color from low level to high level and maintaining the corresponding on-time after the light source module control signal corresponding to the first color is changed to low level, and finally changing the light source module control signal corresponding to the third color from low level to high level and maintaining the corresponding on-time after the light source module control signal corresponding to the second color is changed to low level;
wherein,
the power output module comprises three constant current drivers, each constant current driver is a constant current power supply with open circuit protection, and when a control signal of a certain light source module is at a high level, the constant current driver connected with the power output module outputs a driving current and drives the corresponding light source module to emit light; in addition, the light source module control signals (PWM1, PWM2 and PWM3) corresponding to the three colors are divided in time, so that at most one of the light source module control signals is at a high level at any moment, and the power output module outputs at most one path of driving voltage or current to drive the corresponding light source module to emit light; when the first light source module control signal (PWM1) is at a high level, the first constant current driver outputs a driving current to drive the red light source module to emit light, when the second light source module control signal (PWM2) is at a high level, the second constant current driver outputs a driving current to drive the green light source module to emit light, and when the third light source module control signal (PWM3) is at a high level, the third constant current driver outputs a driving current to drive the blue light source module to emit light, so that the voltage output power is distributed to the red light source module, the green light source module and the blue light source module through the first constant current driver, the second constant current driver and the third constant current driver at different time periods in a control cycle;
wherein,
the time division multiplexing control module and the power output module are connected with the power converter, and the power converter provides a direct current power supply for the time division multiplexing control module and the power output module, so that the maximum power of the LED lamps is determined and the same, the maximum power of the red, green and blue light source modules is the same, and the maximum brightness of monochromatic light emission is ensured to be consistent with the maximum brightness of three-color light emission during color adjustment.
2. The LED lamp color adjustment driver of claim 1, wherein said communication interface is a digitally addressable lighting interface.
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| CN201110272764.2A CN102421230B (en) | 2011-09-15 | 2011-09-15 | A kind of LED color adjustment driver |
| CN201510353103.0A CN104936350B (en) | 2011-09-15 | 2011-09-15 | A kind of light-dimming method of LED light emission device |
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| CN201515523U (en) * | 2009-05-27 | 2010-06-23 | 彩虹集团公司 | Driving device of light-emitting diode LED |
| CN102087834A (en) * | 2009-12-08 | 2011-06-08 | Nxp股份有限公司 | Method and apparatus for LED driver color-sequential scan |
Also Published As
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| CN104936350A (en) | 2015-09-23 |
| CN102421230A (en) | 2012-04-18 |
| CN104936350B (en) | 2017-12-12 |
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