CN108156690B - LED dimming method and system based on ambient brightness - Google Patents
LED dimming method and system based on ambient brightness Download PDFInfo
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- CN108156690B CN108156690B CN201611109544.7A CN201611109544A CN108156690B CN 108156690 B CN108156690 B CN 108156690B CN 201611109544 A CN201611109544 A CN 201611109544A CN 108156690 B CN108156690 B CN 108156690B
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Abstract
The invention provides an LED dimming method and system based on ambient brightness, which comprises the steps of collecting ambient brightness information through a brightness sensor, generating an ambient brightness signal and transmitting the ambient brightness signal to a PWM signal generator; the PWM signal generator receives the ambient brightness signal and determines the dimming level; the PWM signal generator generates a voltage change signal corresponding to the dimming grade on the LED drive circuit according to the dimming grade; the LED driver collects the voltage change signal through the driving circuit, determines the dimming level according to the collected voltage change signal, and adjusts the output power so as to achieve the dimming purpose. The invention transmits the dimming information through the voltage change signal on the LED driving circuit, and solves the problems of equipment cost, installation cost and electromagnetic compatibility caused by additionally arranging a dimming signal transmission circuit in the prior art.
Description
Technical Field
The invention relates to the technical field of LED driving, in particular to an LED dimming method and system based on ambient brightness.
Background
Due to the advantages of energy conservation and environmental protection, the LED is widely applied as a new generation of lighting source. The LED dimming device can enable the LED lighting system to sense the brightness of the external environment to perform dimming, so that the energy consumption is saved, and more intelligent and comfortable lighting environment is provided.
In the existing dimming control scheme of the LED lighting system according to the ambient brightness, after the ambient brightness is detected by the light sensing device, an ambient brightness signal is transmitted to an MCU (Micro Controller Unit) module, the MCU module converts the ambient brightness signal into a dimming signal and transmits the dimming signal to an LED driver, and the LED driver adjusts the output power according to the received dimming signal to achieve the purpose of dimming.
The disadvantage of this solution is that since the light sensing device is usually installed together with the lighting fixture to sense the ambient brightness, and the light source driver is installed outside the lighting fixture, the process of transmitting and converting the ambient brightness signal into the dimming signal requires additional dimming signal transmission line and MCU processor. Especially in the field of outdoor lighting, when the distance between the light source driver and the LED lamp and the light sensing device is long, a long light sensing signal and dimming signal transmission line are required, the cost of the added line is high, and distortion of the dimming signal caused by the electromagnetic compatibility problem is caused.
Disclosure of Invention
The invention aims to provide a novel LED dimming method and system based on ambient brightness, which can replace the technical scheme of transmitting a dimming signal by additionally arranging a dimming signal line in the prior art so as to reduce the cost caused by additionally arranging the dimming line and simultaneously avoid the problem of electromagnetic compatibility caused by additionally arranging the dimming line.
In order to achieve the above object, the present invention provides an LED dimming method based on ambient brightness, comprising the following steps:
the brightness sensor collects the ambient brightness information, generates an ambient brightness signal and transmits the ambient brightness signal to a PWM (Pulse Width Modulation) signal generator;
the PWM signal generator receives the ambient brightness signal and determines the dimming level;
the PWM signal generator generates a voltage change signal corresponding to the dimming grade according to the dimming grade;
the LED driver collects the voltage change signal through an LED driving circuit;
the LED driver determines the dimming level according to the acquired voltage change signal, and adjusts the output power to achieve the dimming purpose.
As an alternative, the method for generating the voltage variation signal corresponding to the dimming level on the LED driving line by the PWM signal generator according to the dimming level includes: and performing power-on and power-off operation on at least one lamp bead in the LED lamp by using the MOSFET or the triode to generate a voltage change signal corresponding to the dimming level.
As an alternative, the power on/off operation is: in a sampling period of collecting voltage change signals by the LED driver, at least one lamp bead is powered on or powered off, and the voltage change signals are converted into digital signals consisting of high and low level signals. The digitized signal represents the dimming level.
As an alternative, the power on/off operation is: in a sampling period of collecting voltage change signals by the LED driver, at least one lamp bead is switched on and off at a fixed frequency and a signal width, and the voltage change signals are converted into digital signals consisting of high and low level signals. The digitized signal represents the dimming level.
As an alternative, converting the voltage variation signal into a digitized signal composed of high and low level signals includes: defining a high level as a digital signal 1 and a low level as a digital signal 0; or, the low level is a digital signal 0, the high level is a digital signal 1, the power-on and power-off operation of the fixed frequency and the signal width is converted into a group of binary digital codes, and the start bit, the end bit and the check code are added to the binary digital codes to obtain the digitized signals.
As an alternative, the power on/off operation is: in a sampling period of collecting voltage change signals by the LED driver, at least one lamp bead is powered on or powered off at a certain frequency to generate voltage change signals at a certain frequency. The dimming level is represented by the frequency.
As an alternative, the power on/off operation is: in a sampling period of collecting voltage change signals by the LED driver, the LED driver conducts power-on and power-off operation on at least one lamp bead at a certain duty ratio to generate voltage change signals with a certain duty ratio. The dimming level is represented by the duty cycle.
As an alternative, the power on/off operation is: in a sampling period of collecting voltage change signals by the LED driver, at least one lamp bead is subjected to power on/off operation for a certain number of times, and voltage change for a certain number of times is generated. The dimming level is represented by the above-mentioned number of voltage changes.
As an alternative, the power on/off operation is: in a sampling period of collecting voltage change signals by the LED driver, carrying out single electrifying or power-off operation on at least one lamp bead for a certain time length to generate voltage change for a certain time length. The dimming level is represented by the voltage change period.
The invention provides an LED dimming system based on ambient brightness, which comprises an LED driver, an LED lamp, a PWM signal generator and a brightness sensor, wherein the LED driver provides working voltage and current for the LED lamp through a driving circuit, and the brightness sensor acquires ambient brightness information, generates an ambient brightness signal and transmits the ambient brightness signal to the PWM signal generator, and is characterized in that:
the PWM signal generator also comprises a brightness signal receiving module, a brightness signal analyzing module and a voltage change generating module, wherein the brightness signal receiving module is used for receiving an environment brightness signal sent by a brightness sensor; the brightness analyzing module is used for analyzing the ambient brightness signal and determining the dimming level; the voltage change generation module is used for controlling the PWM signal generator to generate a voltage change signal corresponding to the dimming level on the LED driving circuit;
the LED driver also comprises a voltage change signal acquisition module, a voltage change signal analysis module and an output power adjustment module, wherein the voltage change signal acquisition module is used for acquiring a voltage change signal on the LED driving circuit; the voltage change signal analysis module is used for analyzing the voltage change signal and determining the dimming grade; the output power adjusting module is used for controlling and adjusting the LED driving output power to realize the dimming operation of the dimming grade.
As an alternative, the PWM signal generator performs power-on and power-off operations on at least one lamp bead in the LED lamp through the MOSFET or the triode to generate a voltage variation signal on the LED driving circuit.
As an alternative, the power on/off operation includes: in a sampling period of collecting voltage change signals by the LED driver, at least one lamp bead is switched on or off at a fixed frequency and a signal width.
As an alternative, the power on/off operation includes: in a sampling period of collecting voltage change signals by the LED driver, at least one lamp bead is powered on or powered off at a certain frequency.
As an alternative, the power on/off operation includes: in a sampling period of collecting voltage change signals by the LED driver, the LED driver performs power-on and power-off operation on at least one lamp bead at a certain duty ratio.
As an alternative, the power on/off operation includes: and in a sampling period of the LED driver for acquiring voltage change signals, carrying out on-off operation on at least one lamp bead for a certain number of times.
As an alternative, the power on/off operation includes: in a sampling period of collecting voltage change signals by the LED driver, at least one lamp bead is subjected to single electrifying or power-off operation for a certain time.
The invention has the advantages that: the LED dimming method and system based on the ambient brightness are based on basic devices in a common LED driving control circuit, the PWM signal generator is used for conducting power-on and power-off operation on at least one lamp bead in an LED lamp to generate voltage change signals on an LED driving circuit, different levels of dimming requirements are carried through the diversity of the voltage change, and an LED driver adjusts output power by detecting and analyzing the voltage change on the LED driving circuit to achieve dimming of the levels.
Through the technical scheme of transmitting the dimming command through the voltage change signal, the problems of equipment cost and installation cost caused by the fact that a dimming signal transmission line needs to be additionally arranged in the prior art are solved, and the problem of electromagnetic compatibility caused by the fact that the dimming signal transmission line is additionally arranged for the whole lighting circuit system is avoided. The dimming scheme provided by the invention is convenient and feasible, and can select the conversion modes between different types of voltage change signals and dimming levels according to the specific dimming level requirements of the LED lighting system, so that the dimming accuracy is high.
Drawings
Fig. 1 is a schematic flowchart of an LED dimming method based on ambient brightness according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a voltage variation waveform signal according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a voltage variation waveform signal according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a voltage variation waveform signal according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a voltage variation waveform signal according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a voltage variation waveform signal according to an embodiment of the present invention;
fig. 7 is a schematic diagram of an LED dimming system based on ambient brightness according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to specific embodiments and with reference to the accompanying drawings.
The invention provides an LED dimming method based on ambient brightness, which comprises the following steps as shown in figure 1:
102, receiving an ambient brightness signal by a PWM signal generator, and determining a dimming level;
103, generating a voltage change signal corresponding to the dimming grade by the PWM signal generator according to the dimming grade;
104, collecting the voltage change signal by the LED driver through an LED driving circuit;
and 105, determining the dimming level by the LED driver according to the acquired voltage change signal, and adjusting the output power to realize the purpose of dimming.
The dimming method provided by the invention solves the problems of equipment cost and installation cost caused by the additional arrangement of the dimming signal transmission line in the prior art, and simultaneously avoids the problem of electromagnetic compatibility caused by the arrangement of the dimming signal transmission line to the whole lighting circuit system.
Optionally, the method for generating the voltage variation signal corresponding to the dimming level on the LED driving line by the PWM signal generator according to the dimming level includes: and performing power-on and power-off operation on at least one lamp bead in the LED lamp by using the MOSFET or the triode to generate a voltage change signal corresponding to the dimming level. The switching on and off operation of at least one lamp bead in the LED lamp by the switching device is a key step of generating a voltage change signal in the technical scheme of the present invention, and of course, except the MOSFET and the triode disclosed in this embodiment, other controllable switching devices commonly used in the art can achieve the same technical effect.
Optionally, the power on/off operation is: in a sampling period of collecting voltage change signals by the LED driver, at least one lamp bead is powered on or powered off, and the voltage change signals are converted into digital signals consisting of high and low level signals. The dimming level is represented by a digitized signal.
Optionally, the power on/off operation is: in a sampling period of collecting voltage change signals by the LED driver, at least one lamp bead is switched on and off at a fixed frequency and a signal width, and the voltage change signals are converted into digital signals consisting of high and low level signals. The dimming level is represented by a digitized signal.
Further, converting the voltage variation signal into a digitized signal composed of high and low level signals includes: defining a high level as a digital signal 1 and a low level as a digital signal 0; or, the low level is a digital signal 0, the high level is a digital signal 1, the power-on and power-off operation of the fixed frequency and the signal width is converted into a group of binary digital codes, and the start bit, the end bit and the check code are added to the binary digital codes to obtain the digitized signals.
The technical scheme of using the fixed frequency and the signal width as the basis and using the standard digital mode to correspond to the dimming level is a scheme which is easier to realize in the embodiment of the invention: the standardized binary codes represent different dimming levels by using a certain number of binary codes, such as 8 bits, wherein the high level is defined as 1, the low level is defined as 0, and the 8-bit binary codes are 00000000-. In addition, a start bit, a stop bit and a check code can be added on the basis of the binary codes, different dimming grade signals can be represented according to a signal mode more suitable for being recognized by the LED dimming system, the alternative scheme of the embodiment has the advantages of simple communication protocol, stable signal transmission, simple and easy switching operation of the MOSFET or the triode, very small influence on light and very high practical application priceThe value is obtained. As shown in fig. 2, when the at least one lamp bead is powered on, the voltage on the LED driving circuit is VonWhen power is off, it is VoffT represents time, the low level is defined as 0, the high level is defined as 1, the binary number is 01010101, and the binary number can be used to correspond to a dimming level.
Optionally, the power on/off operation is: in a sampling period of collecting voltage change signals by the LED driver, at least one lamp bead is powered on or powered off at a certain frequency to generate voltage change signals at a certain frequency. The dimming level is represented by the frequency. The power-on and power-off operation scheme represents different dimming level requirements by using the switching operation frequency of the MOSFET or the triode, and correspondingly, the LED driver detects the frequency of the voltage waveform change so as to determine the dimming level. As shown in fig. 3, when the at least one lamp bead is powered on, the voltage on the LED driving circuit is VonWhen power is off, it is VoffT represents time, T is the duration of one on-off cycle, and different dimming levels are represented by different switching frequencies f (f is 1/T).
Optionally, the power on/off operation is: in a sampling period of collecting voltage change signals by the LED driver, the LED driver conducts power-on and power-off operation on at least one lamp bead at a certain duty ratio to generate voltage change signals with a certain duty ratio. The dimming level is represented by the duty cycle. The power-on and power-off operation scheme represents different dimming level requirements by the duty ratio of the switching operation of the MOSFET or the triode, and correspondingly, the LED driver detects the duty ratio parameter carried by the voltage waveform so as to determine the dimming level. The voltage variation waveform shown in FIG. 4 has a power-on duration T within one power-on and power-off cycleonThe power-off duration is ToffDuty Ratio is Ton/(Ton+Toff) Different dimming levels are represented by different duty cycle parameters.
Optionally, the power on/off operation is: in a sampling period of collecting voltage change signals by the LED driver, at least one lamp bead is subjected to power on/off operation for a certain number of times, and voltage change for a certain number of times is generated. By the above-mentioned voltageThe number of changes represents the dimming level. The power-on and power-off operation scheme represents different dimming grade requirements by the power-on and power-off times of the MOSFET or the triode on the LED lamp bead, and correspondingly, the LED driver detects the change times of the voltage waveform, so that the dimming grade is determined. The voltage on the LED driving circuit is V as shown in the voltage variation waveform diagram of FIG. 5onAnd VoffThe total number of changes between the two is 6, and different dimming levels are represented by different change times of the voltage.
Optionally, the power on/off operation is: in a sampling period of collecting voltage change signals by the LED driver, carrying out single electrifying or power-off operation on at least one lamp bead for a certain time length to generate voltage change for a certain time length. The dimming level is represented by the voltage change period. The power-on and power-off operation scheme represents different dimming grade requirements by using the single power-on or power-off time of the LED lamp bead through the MOSFET or the triode, and correspondingly, the LED driver detects the time of single voltage waveform change so as to determine the dimming grade. The voltage variation waveform shown in FIG. 6 is the original voltage V on the LED driving circuitonUnder the condition, the lamp bead is subjected to power-off operation T for a certain time at a timeoffDifferent dimming levels are represented by different single voltage change durations.
According to the LED dimming method based on the ambient brightness, the dimming command is transmitted through the change of the voltage waveform on the LED driving circuit. The dimming signal transmission line and the device which are additionally arranged in the traditional dimming scheme are omitted, the dimming scheme is convenient and feasible, the dimming level and the voltage waveform control and change mode are various and selectable, and the dimming circuit has very obvious practical application value.
An LED dimming system based on ambient brightness according to an embodiment of the present invention, as shown in fig. 7, includes an LED driver 71, an LED lamp 72, a PWM signal generator 73, and a brightness sensor 74, where the LED driver provides a working voltage and a current for the LED lamp through a driving circuit 75, and the brightness sensor collects ambient brightness information, generates an ambient brightness signal, and transmits the ambient brightness signal to the PWM signal generator;
the PWM signal generator further includes a luminance signal receiving module 731, a luminance signal analyzing module 732, and a voltage change generating module 733, where the luminance signal receiving module is configured to receive an ambient luminance signal sent by the luminance sensor; the brightness analyzing module is used for analyzing the ambient brightness signal and determining the dimming level; the voltage change generation module is used for controlling the PWM signal generator to generate a voltage change signal corresponding to the dimming level on the LED driving circuit;
the LED driver further comprises a voltage change signal acquisition module 711, a voltage change signal analysis module 712 and an output power adjustment module 713, wherein the voltage change signal acquisition module is used for acquiring a voltage change signal on the LED driving circuit; the voltage change signal analysis module is used for analyzing the voltage change signal and determining the dimming grade; the output power adjusting module is used for controlling and adjusting the output power of the LED driver to realize the dimming operation of the dimming level.
Optionally, the PWM signal generator performs power on/off operation on at least one lamp bead in the LED lamp through the MOSFET or the triode, to generate a voltage variation signal on the LED driving circuit.
Optionally, the power on/off operation includes: in a sampling period of collecting voltage change signals by the LED driver, at least one lamp bead is switched on or off at a fixed frequency and a signal width.
Optionally, the power on/off operation includes: in a sampling period of collecting voltage change signals by the LED driver, at least one lamp bead is powered on or powered off at a certain frequency.
Optionally, the power on/off operation includes: in a sampling period of collecting voltage change signals by the LED driver, the LED driver performs power-on and power-off operation on at least one lamp bead at a certain duty ratio.
Optionally, the power on/off operation includes: and in a sampling period of the LED driver for acquiring voltage change signals, carrying out on-off operation on at least one lamp bead for a certain number of times.
Optionally, the power on/off operation includes: in a sampling period of collecting voltage change signals by the LED driver, at least one lamp bead is subjected to single electrifying or power-off operation for a certain time.
Finally, according to the LED dimming method and system based on ambient brightness provided in the embodiments of the present invention, the PWM signal generator is used to receive and analyze the ambient brightness information collected and returned by the brightness sensor, after the dimming level is determined, the on-off operation is performed on at least one lamp bead in the LED lamp to generate a voltage variation waveform corresponding to the dimming level, and the LED driver detects and analyzes the waveform to adjust the output power to implement dimming of the dimming level. The dimming scheme provided by the invention is convenient and feasible, and can select the conversion modes between different types of voltage change signals and dimming levels according to the specific dimming level requirements of the LED lighting system, so that the dimming accuracy is high.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the present invention. It will be understood by those skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for portions or all of the technical features thereof without departing from the scope of the present invention.
Claims (12)
1. An LED dimming method based on ambient brightness is characterized by comprising the following steps:
the brightness sensor collects ambient brightness information, generates an ambient brightness signal and transmits the ambient brightness signal to the PWM signal generator;
the PWM signal generator receives the ambient brightness signal and determines a dimming level;
the PWM signal generator generates a voltage change signal corresponding to the dimming grade according to the dimming grade;
the LED driver collects the voltage change signal through an LED driving circuit;
the LED driver determines the dimming level according to the acquired voltage change signal and adjusts the output power;
the method for generating the voltage change signal corresponding to the dimming level on the LED driving circuit by the PWM signal generator according to the dimming level comprises the following steps: performing power-on and power-off operation on at least one lamp bead in the LED lamp by using an MOSFET or a triode to generate the voltage change signal;
the power on/off operation is as follows: and in a sampling period of the LED driver collecting the voltage change signal, performing power-on and power-off operation on the at least one lamp bead, converting the voltage change signal into a digital signal consisting of high and low level signals, wherein the digital signal represents the dimming level.
2. The dimming method according to claim 1, wherein the at least one lamp bead is powered on or powered off at a fixed frequency and signal width during a sampling period in which the LED driver collects the voltage variation signal, and the voltage variation signal is converted into a digitized signal composed of high and low level signals, and the digitized signal represents the dimming level.
3. The dimming method according to claim 1 or 2, wherein converting the voltage variation signal into a digitized signal composed of high and low level signals comprises: the high level is a digital signal 1, and the low level is a digital signal 0; and converting the power-on and power-off operation into a group of binary digital codes to obtain the digitized signal.
4. The dimming method of claim 1, wherein the power-on and power-off operation is: and in a sampling period of the voltage change signal acquired by the LED driver, performing power-on and power-off operation on the at least one lamp bead at a certain frequency to generate a voltage change signal at a certain frequency, wherein the frequency represents the dimming level.
5. The dimming method of claim 1, wherein the power-on and power-off operation is: and in a sampling period of the voltage change signal acquired by the LED driver, the at least one lamp bead is switched on and off at a certain duty ratio to generate a voltage change signal with a certain duty ratio, and the duty ratio represents the dimming level.
6. The dimming method of claim 1, wherein the power-on and power-off operation is: and in a sampling period of the voltage change signal acquired by the LED driver, performing power on/off operation on the at least one lamp bead for a certain number of times to generate voltage change for a certain number of times, wherein the number of times represents the dimming level.
7. The dimming method of claim 1, wherein the power-on and power-off operation is: and in a sampling period of the voltage change signal acquired by the LED driver, carrying out single power-on or power-off operation on the at least one lamp bead for a certain time length to generate voltage change for a certain time length, wherein the voltage change time length represents the dimming grade.
8. The utility model provides a LED dimming system based on ambient brightness, includes LED driver, LED lamps and lanterns, PWM signal generator and luminance sensor, the LED driver passes through the drive line and provides operating voltage and electric current for LED lamps and lanterns, luminance sensor gathers ambient brightness information, generates ambient brightness signal and transmits to PWM signal generator, its characterized in that:
the PWM signal generator also comprises a brightness signal receiving module, a brightness signal analyzing module and a voltage change generating module, wherein the brightness signal receiving module is used for receiving an environment brightness signal sent by the brightness sensor; the brightness signal analysis module is used for analyzing the environment brightness signal and determining the dimming level; the voltage change generation module is used for controlling the PWM signal generator to generate a voltage change signal corresponding to the dimming level on the LED driving circuit;
the LED driver also comprises a voltage change signal acquisition module, a voltage change signal analysis module and an output power adjustment module, wherein the voltage change signal acquisition module is used for acquiring a voltage change signal on the LED driving circuit; the voltage change signal analysis module is used for analyzing the voltage change signal and determining the dimming level; the output power adjusting module is used for controlling the output power of the LED driver and realizing the dimming operation of the dimming level;
the PWM signal generator conducts power-on and power-off operation on at least one lamp bead in the LED lamp through an MOSFET or a triode to generate the voltage change signal;
the power on/off operation includes: and in a sampling period of the voltage change signal collected by the LED driver, the at least one lamp bead is switched on and off at a fixed frequency and a signal width.
9. The dimming system of claim 8, wherein the power-on and power-off operation comprises: and in a sampling period of the voltage change signal acquired by the LED driver, the at least one lamp bead is switched on or off at a certain frequency.
10. The dimming system of claim 8, wherein the power-on and power-off operation comprises: and in a sampling period that the LED driver collects the voltage change signal, carrying out power-on and power-off operation on the at least one lamp bead at a certain duty ratio.
11. The dimming system of claim 8, wherein the power-on and power-off operation comprises: and in a sampling period of the voltage change signal acquired by the LED driver, carrying out on-off operation on the at least one lamp bead for a certain number of times.
12. The dimming system of claim 8, wherein the power-on and power-off operation comprises: and in a sampling period of the voltage change signal acquired by the LED driver, carrying out single power-on or power-off operation on the at least one lamp bead for a certain time.
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| CN201611109544.7A CN108156690B (en) | 2016-12-06 | 2016-12-06 | LED dimming method and system based on ambient brightness |
| PCT/CN2017/114164 WO2018103591A1 (en) | 2016-12-06 | 2017-12-01 | Ambient brightness-based led adjustment method and system |
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| CN112351552A (en) * | 2019-08-07 | 2021-02-09 | 调调（北京）科技有限公司 | Lamp and control method and device thereof |
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| CN114025448B (en) * | 2021-12-02 | 2023-10-20 | 深圳市源立信照明科技有限公司 | Flat lamp circuit and control method thereof |
| CN114071843B (en) * | 2022-01-17 | 2022-05-13 | 杭州品拓电子技术有限公司 | Stroboscopic device capable of automatically adjusting brightness of light source |
| CN116156696B (en) * | 2023-04-23 | 2023-07-04 | 永林电子股份有限公司 | LED lamp brightness control device |
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| CN108156690A (en) | 2018-06-12 |
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