CN114071843B - Stroboscopic device capable of automatically adjusting brightness of light source - Google Patents

Stroboscopic device capable of automatically adjusting brightness of light source Download PDF

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Publication number
CN114071843B
CN114071843B CN202210046654.2A CN202210046654A CN114071843B CN 114071843 B CN114071843 B CN 114071843B CN 202210046654 A CN202210046654 A CN 202210046654A CN 114071843 B CN114071843 B CN 114071843B
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waveform
light source
unit
driving
brightness
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CN114071843A (en
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卢勇跃
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Hangzhou Pntoo Electronic Technology Co ltd
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Hangzhou Pntoo Electronic Technology 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/105—Controlling the light source in response to determined parameters
    • H05B47/11—Controlling the light source in response to determined parameters by determining the brightness or colour temperature of ambient 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]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/12—Controlling the intensity of the light using optical feedback
    • 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]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/18—Controlling the intensity of the light using temperature feedback
    • 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
    • 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
    • H05B45/305—Frequency-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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/16—Controlling the light source by timing means
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/165—Controlling the light source following a pre-assigned programmed sequence; Logic control [LC]
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/25—Circuit arrangements for protecting against overcurrent
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

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  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The invention discloses a stroboscopic device for automatically adjusting light source brightness, which comprises: a control module for generating a drive waveform and a voltage threshold; the driving module is used for driving the output light source to emit light; the environment brightness detection module is used for generating an environment illumination intensity value; the acquisition module is used for acquiring the waveform of the driving signal; a waveform generation module comprising: an upper limit filtering unit for obtaining an upper limit filtering waveform; the integration unit is used for generating a filtered integration value; a first waveform generating unit for generating a first compensation wave; the dynamic comparison unit is used for obtaining a waveform peak value; the operation unit is used for calculating to obtain a waveform slope value; a second waveform generating unit for generating a second compensation wave; a subtraction unit for obtaining a compensated total waveform; an addition unit for generating a compensated drive waveform; and the driving module adjusts the brightness of the output light source according to the compensated driving waveform. The invention automatically adjusts the brightness of the output light source according to the ambient brightness.

Description

Stroboscopic device capable of automatically adjusting brightness of light source
Technical Field
The invention relates to the technical field of stroboscopic detection instruments, in particular to a stroboscopic device capable of automatically adjusting the brightness of a light source.
Background
The stroboscope is an optical measuring instrument which controls a light source to emit light and rapidly flashes at a specific frequency. The stroboscope can emit short-time and frequent flashes, and when the flash frequency is close to or synchronous with the rotation or movement speed of the object to be detected, the surface quality or the operation condition of the high-speed moving object can be easily observed by using the persistence of vision or video synchronization of eyes. At present, as shown in fig. 1, an internal circuit of an existing stroboscope mainly includes a control module, a driving module, and an output light source, where the control module is configured to generate a driving waveform, and the driving module outputs a driving signal according to the driving waveform to drive the output light source to perform stroboscopic light emission. However, the output light source of the existing stroboscope has inconsistent stimulation degree to human eyes under different ambient brightness. Under certain ambient brightness, when the brightness of an output light source of the stroboscope is too high, discomfort can be caused to human eyes, and the appearance is influenced.
Disclosure of Invention
In view of the disadvantages of the prior art, an object of the present invention is to provide a strobe device capable of automatically adjusting the brightness of a light source, which is used to automatically adjust the brightness of an output light source according to the ambient brightness, thereby improving the user's appearance.
In order to achieve the purpose, the invention provides the following technical scheme: a strobe device for automatically adjusting the brightness of a light source, comprising:
the control module is used for generating a driving waveform;
the driving module is respectively connected with the control module and the at least one output light source and is used for driving the output light source to carry out stroboscopic light emitting according to the driving waveform and outputting a driving signal;
the strobe device further includes:
the environment brightness detection module is connected with the control module and used for detecting the environment illumination intensity in the external environment so as to generate an environment illumination intensity value;
the control module generates a voltage threshold according to the ambient light intensity value;
the acquisition module is connected with the driving module and is used for acquiring the waveform of the driving signal;
the waveform generation module is respectively connected with the acquisition module, the control module and the driving module, and comprises:
the configuration end of the upper limit filtering unit is used for receiving the waveform of the driving signal, the output end of the upper limit filtering unit is used for outputting an upper limit filtering waveform generated according to the waveform of the driving signal, and the upper limit filtering waveform is a waveform of which the amplitude exceeds the voltage threshold value in the waveform of the driving signal;
an input end of the integrating unit is used for receiving the upper limit filtering waveform, and an output end of the integrating unit is used for outputting a filtered area numerical value which is obtained by integrating according to the upper limit filtering waveform and is used for reflecting the effective area of the upper limit filtering waveform;
the first waveform generating unit comprises a first configuration end and a second configuration end, wherein the first configuration end is used for receiving the filtered product value, and the second configuration end is used for outputting a first compensation wave generated according to the filtered product value;
the input end of the dynamic comparison unit is used for receiving the first compensation wave, and the output end of the dynamic comparison unit is used for outputting a difference waveform generated according to the first compensation wave and extracting a waveform peak value obtained from the difference waveform;
the operation unit is configured with a preset operation formula, and the output end of the operation unit is used for outputting a waveform slope value obtained by processing the luminous waveform through the preset operation formula;
the second waveform generating unit comprises a third configuration end and a fourth configuration end, the third configuration end is used for receiving the waveform peak value, the fourth configuration end is used for receiving the waveform slope value, the output end of the second waveform generating unit is used for outputting a second compensation wave which is generated according to the waveform peak value and the waveform slope value and is used for reflecting the change rate of the second compensation wave;
a configuration end of the subtraction unit is used for receiving the first compensation wave and the second compensation wave, and an output end of the subtraction unit is used for outputting a compensation total waveform obtained by subtracting the first compensation wave from the second compensation wave;
the configuration end of the addition unit is used for receiving the compensation total waveform and the driving waveform, and the output end of the addition unit is used for outputting the compensated driving waveform obtained by summing the compensation total waveform and the driving waveform;
and the driving module drives the output light source according to the compensated driving waveform so as to adjust the brightness of the output light source.
Further, the strobe device further includes a light source detection module connected to the output light source, the light source detection module includes:
the output end of the timing unit is used for outputting the light-emitting time accumulated and recorded when the output light source emits light;
a storage unit, an input end of the storage unit is used for receiving the light-emitting time of the accumulated record, and an output end of the storage unit is used for outputting the light-emitting time of the saved accumulated record;
and the control module adjusts the voltage threshold according to the light-emitting time recorded in an accumulated mode and a preset adjusting formula.
Further, the preset adjustment formula is configured to:
U＝dB+et3 2；
wherein U is used to represent a voltage threshold;
d is used for representing a preset environment brightness coefficient;
e is used for representing a preset light-emitting time constant;
b is used for representing the ambient light intensity value;
t3for indicating the emission time cumulatively recorded by the output light source.
Further, the ambient brightness detection module is an ambient light sensor, and the ambient brightness coefficient is in a positive correlation with the external ambient temperature.
Further, the relationship between the ambient brightness coefficient and the external ambient temperature is configured to:
d＝T*t4 2；
wherein d is used for representing the ambient brightness coefficient;
t is used to represent the external ambient temperature;
t4for indicating the illumination time of the external ambient light.
Further, the output light source is an LED lamp set, and the light-emitting time constant is in a negative correlation with the service life of the output light source.
Further, the relationship between the light emission time constant and the lifetime of the output light source is configured to:
e＝t3/L；
wherein e is used for representing the light-emitting time constant;
l is used for representing the service life of the output light source;
t3for indicating the emission time cumulatively recorded by the output light source.
Further, the driving module is internally provided with a triode, the driving module comprises a drain current detection circuit, the input end of the drain current detection circuit is connected to the drain electrode of the triode, the output end of the drain current detection circuit is connected to the control module, the drain current detection circuit is used for detecting the real-time current flowing through the drain electrode of the triode, an alarm signal is generated when the real-time current is greater than a preset current threshold value, and the control module stops driving the driving module according to the alarm signal.
Further, the preset operation formula is configured to:
k1＝(a(t1-b％t2+t2％t1)+ct1)/(aU1+(b-c)U2)；
wherein k is1For representing the waveform slope value;
t1for representing an arbitrary first time;
U1for representing a first drive voltage corresponding to the first time;
t2for representing an arbitrary second time;
U2for representing a second driving voltage corresponding to the second time;
a is used for representing a preset first constant;
b is used for representing a preset second constant;
c is used for representing a preset third constant;
and if the first time is not equal to the second time, the first driving voltage is not equal to the second driving voltage.
Further, the second compensation wave is a step wave, and the second waveform generating unit includes:
a configuration end of the differential subunit is used for receiving the waveform peak value, and an output end of the differential subunit is used for outputting the unit height of each layer of step in the second compensation wave obtained by differential processing according to the waveform peak value;
and the configuration end of the generating subunit is used for receiving the unit height and the waveform slope value, and the output end of the generating subunit is used for outputting the second compensation wave obtained by processing according to the waveform slope value and the unit height.
The invention has the beneficial effects that:
the invention obtains the environmental illumination intensity value of the external environment through the detection of the environmental brightness detection module, generates the voltage threshold value according to the environmental illumination intensity value, sequentially carrying out upper limit filtering and integral operation on the waveform of the driving signal according to the voltage threshold value to generate a first compensation wave, further generating a difference waveform according to the compensation triangular wave, extracting a peak waveform from the difference waveform, generating a second compensation wave according to the waveform slope value and the waveform peak value obtained by operation, sequentially carrying out subtraction operation and addition operation on the second compensation wave to finally obtain a compensated driving waveform, the driving module can adjust the driving signal of the output light source according to the compensated driving waveform, so that the brightness of the output light source can be automatically adjusted, the impression of human eyes on the output light source under different ambient brightness is effectively improved, and the discomfort of the human eyes caused by overhigh output brightness is avoided.
Drawings
FIG. 1 is a schematic diagram of a prior art strobe;
FIG. 2 is a schematic view of a strobe device according to the present invention;
FIG. 3 is a schematic diagram of a waveform generation module according to the present invention;
FIG. 4 is a schematic view of a light source detecting module according to the present invention
FIG. 5 is a schematic structural diagram of a second waveform generating unit according to the present invention;
FIG. 6 is a schematic diagram of the driving waveforms in the present invention;
FIG. 7 is a schematic diagram of a waveform of a driving signal in the present invention;
fig. 8 is a schematic diagram of a compensated drive waveform in the present invention.
Reference numerals: 1. an ambient brightness detection module; 2. a drive module; 21. a triode; 22. a drain current detection circuit; 3. an output light source; 4. an acquisition module; 5. a control module; 6. a waveform generation module; 61. an upper limit filtering unit; 62. an integration unit; 63. a first waveform generating unit; 64. a dynamic comparison unit; 65. an arithmetic unit; 66. a second waveform generating unit; 661. a micro molecular unit; 662. generating a subunit; 67. a subtraction unit; 68. an adding unit; 7. a light source detection module; 71. a timing unit; 72. and a memory unit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "bottom" and "top," "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
As shown in fig. 2 and fig. 3, a strobe device of the present embodiment for automatically adjusting the brightness of a light source includes:
a control module 5 for generating a driving waveform, as shown in fig. 6;
the driving module 2 is respectively connected with the control module 5 and the at least one output light source 3, and is used for driving the output light source 3 to perform stroboscopic light emitting according to the driving waveform and outputting a driving signal;
the strobe device further includes:
the environment brightness detection module 1 is used for detecting the environment illumination intensity in the external environment to generate an environment illumination intensity value;
the control module 5 generates a voltage threshold according to the ambient light intensity value;
the acquisition module 4 is connected with the driving module 2 and used for acquiring the waveform of the driving signal, as shown in fig. 7;
the waveform generation module 6 is respectively connected with the acquisition module 4, the control module 5 and the driving module 2, and comprises:
the configuration end of the upper limit filtering unit 61 is used for receiving the waveform of the driving signal, the output end of the upper limit filtering unit 61 is used for outputting an upper limit filtering waveform generated according to the waveform of the driving signal, and the upper limit filtering waveform is a waveform of which the amplitude exceeds a voltage threshold value in the waveform of the driving signal;
an integrating unit 62, an input end of the integrating unit 62 is configured to receive the upper limit filtering waveform, and an output end of the integrating unit 62 is configured to output a filtered area value obtained by integrating according to the upper limit filtering waveform and used for reflecting an effective area of the upper limit filtering waveform;
a first waveform generating unit 63, including a first configuration end and a second configuration end, where the first configuration end is configured to receive the filtered area value, and the second configuration end is configured to output a first compensation wave generated according to the filtered area value, as shown in fig. 8;
a dynamic comparison unit 64, an input end of the dynamic comparison unit 64 is configured to receive the first compensation wave, and an output end of the dynamic comparison unit 64 is configured to output a difference waveform generated according to the first compensation waveform, and extract a waveform peak value obtained from the difference waveform;
an operation unit 65 configured with a preset operation formula, wherein an output end of the operation unit 65 is configured to output a waveform slope value obtained by processing a waveform of the driving signal through the preset operation formula;
a second waveform generating unit 66, including a third configuration end and a fourth configuration end, where the third configuration end is used to receive a waveform peak value, the fourth configuration end is used to receive a waveform slope value, an output end of the second waveform generating unit 66 is used to output a second compensation wave generated according to the waveform peak value and the waveform slope value and the waveform change value is used to reflect the change rate of the second compensation wave;
a subtracting unit 67, a configuration end of the subtracting unit 67 is configured to receive the first compensation wave and the second compensation wave, and an output end of the subtracting unit 67 is configured to output a compensation total waveform obtained by subtracting the first compensation wave from the second compensation wave;
an adding unit 68, a configuration end of the adding unit 68 is configured to receive the compensated total waveform and the driving waveform, and an output end of the adding unit 68 is configured to output a compensated driving waveform obtained by summing the compensated total waveform and the driving waveform, as shown in fig. 8;
the driving module 2 adjusts and drives the output light source 3 according to the compensated driving waveform to adjust the brightness of the output light source 3.
Specifically, in this embodiment, the control module 5 may be an MCU chip. Further, the model of the MCU chip may be STM32F 103. The chip has the advantages of small size and strong computing capability, and is favorable for being used in a highly integrated stroboscopic device. The MCU chip is preset with a preset program and used for outputting a preset driving waveform to the driving module 2 so as to control the driving module 2 to drive the output light source 3 to carry out stroboscopic light emitting within a preset time period. Further, the preset time period may be 3 seconds.
The ambient brightness detection module 1 sends the ambient illumination intensity to the MCU chip after detecting the ambient illumination intensity, and the MCU chip converts the ambient illumination intensity into a voltage threshold according to a preset conversion formula. Wherein the preset conversion formula is configured as:
U＝dB；
wherein U is used to represent a voltage threshold;
d is used for representing a preset environment brightness coefficient;
b is used to represent the ambient light intensity value.
In this embodiment, the upper limit filtering unit 61 may be an upper limit filter, which is a high-pass filter, and the upper limit filter is configured to perform upper limit filtering on the waveform of the driving signal acquired by the acquisition module 4 according to a voltage threshold, so as to obtain an upper limit filtered waveform after the upper limit filtering.
Further, the integrating unit 62 may be an integrator, and the integrator is configured to integrate the filtered waveform output by the upper limit filter to obtain a filtered area value.
Further, the first waveform generating unit 63 may be a triangle generator, and the first compensation wave is a compensation triangle wave, and the triangle generator is configured to generate the compensation triangle wave according to the filtered product value output by the integrator.
The compensation triangular wave is a symmetrical triangular wave, the starting time of the compensation triangular wave is consistent with the starting time of the driving waveform, the period of the compensation triangular wave is consistent with the period of the driving waveform, and the amplitude of the compensation triangular wave is consistent with the amplitude of the driving waveform.
Further, the dynamic comparing unit 64 may be a dynamic comparator for comparing the difference between the compensated triangle wave and the driving waveform at each moment in time until a complete difference waveform is generated. And then extracting the waveform peak value from the difference waveform.
Further, the arithmetic unit 65 may be an arithmetic unit, and the arithmetic unit is configured to extract characteristic data in the waveform of the driving signal and bring the characteristic data into a preset calculation formula, so as to calculate a waveform slope value.
Further, the second waveform generating unit 66 may be a step wave generator, and the second compensation wave is a compensation step wave. The step wave generator is used for generating a waveform change value used for representing the waveform change rate according to the waveform peak value output by the dynamic comparator and the waveform slope value output by the arithmetic unit, and then generating a compensation step wave according to the waveform change value. The starting time of the compensation step wave is consistent with the starting time of the driving waveform, the period of the compensation step wave is consistent with the period of the driving waveform, the amplitude of the compensation step wave is consistent with the waveform peak value, and the waveform peak value is differentiated to obtain the unit height of each layer of steps. The slope of each step is the waveform slope value. The unit width of each layer of steps is calculated according to the unit height and the waveform slope value.
Further, the subtracting unit 67 may be a subtractor, and the subtractor is configured to perform a difference between the compensated triangular wave output by the triangular wave generator and the compensated stepped wave output by the stepped wave generator to obtain a compensated total waveform.
Further, the adding unit 68 may be an adder, and the adder is configured to sum the compensated total waveform output by the subtractor and the preset square wave to obtain the compensated driving waveform.
In the technical scheme, the ambient light intensity value of the external environment is detected by the ambient brightness detection module 1, the voltage threshold value is generated according to the ambient light intensity value, sequentially carrying out upper limit filtering and integral operation on the waveform of the driving signal according to the voltage threshold value to generate a first compensation wave, further generating a difference waveform according to the compensation triangular wave, extracting a peak waveform from the difference waveform, generating a second compensation wave according to the waveform slope value and the waveform peak value obtained by operation, sequentially carrying out subtraction operation and addition operation on the second compensation wave to finally obtain a compensated driving waveform, the driving module 2 can adjust the driving signal of the output light source according to the compensated driving waveform, so that the brightness of the output light source 3 can be automatically adjusted, the visual perception of human eyes on the output light source 3 under different ambient brightness is effectively improved, and the discomfort of human eyes caused by overhigh output brightness is avoided.
In a preferred embodiment of the present invention, the strobe device further includes a light source detection module 7 connected to the output light source 3, as shown in fig. 4, the light source detection module 7 includes:
a timing unit 71, an output end of the timing unit 71 is used for outputting the accumulated and recorded light emitting time when the output light source 3 emits light;
a storage unit 72, an input end of the storage unit 72 is used for receiving the light-emitting time of the accumulated record, and an output end of the storage unit 72 is used for outputting the light-emitting time of the saved accumulated record;
the control module 5 adjusts the voltage threshold according to the cumulated and recorded light-emitting time and a preset adjustment formula.
Specifically, in this embodiment, the timing unit 71 may be a timer, and a chip type number of the timer may be PCF 8563. The storage unit 72 may be a non-volatile Memory, further, the non-volatile Memory includes an EPROM or a Flash Memory. The timer carries out cumulative record on the light emitting time when the output light source 3 emits light each time, and the cumulative record is stored in the nonvolatile memory, so that the loss is avoided, and the safety of the technical scheme is improved.
In a preferred embodiment of the present invention, the preset adjustment formula is configured as:
U＝dB+et3 2；
wherein U is used to represent a voltage threshold;
d is used for representing a preset environment brightness coefficient;
e is used for representing a preset light-emitting time constant;
b is used for representing the ambient illumination intensity value;
t3for indicating the cumulative recorded lighting time of the output light source.
Specifically, in the present embodiment, the degree of influence of the light emission time of the accumulated record on the voltage threshold is large, and therefore, it is necessary to square the light emission time of the accumulated record. The ambient light intensity is detected by the ambient brightness detection module 1, and the ambient light intensity value may be voltage output or current output of the ambient brightness detection module 1. Furthermore, the data format of the ambient light intensity value is floating point type data, and the value of the ambient light intensity value is four digits after the floating point number. Factors affecting the ambient brightness coefficient include: the external ambient temperature, the intensity of the external illumination light, and the wavelength of the external illumination light. Where the influence of the external ambient temperature is particularly important.
In a preferred embodiment of the present invention, the ambient brightness detection module 1 is an ambient light sensor, and the ambient brightness coefficient is in a positive correlation with the external ambient temperature.
Specifically, in this embodiment, the model of the ambient light sensor is LTR-303 ALS-DR. The ambient light sensor is capable of directly connecting I by converting light intensity2The digital output signal of the C-interface, while the ambient light sensor provides a linear response with a wide dynamic range from 0.01lux to 64K lux, suitable for applications at high ambient brightness.
In a preferred embodiment of the present invention, the relationship between the ambient brightness coefficient and the external ambient temperature is configured as:
d＝T*t4 2；
wherein d is used for representing an ambient brightness coefficient;
t is used to represent the external ambient temperature;
t4for indicating the illumination time of the external ambient light.
Specifically, in the present embodiment, the external ambient temperature and the irradiation time of the ambient light to the ambient light sensor both have a positive correlation with the ambient brightness coefficient. The illumination time of the external ambient light has a large influence on the ambient luminance coefficient, and therefore the illumination time of the external ambient light needs to be squared. When the external environment temperature is higher, the resistance value of the photosensitive resistor in the ambient light sensor is smaller, and the ambient brightness coefficient of the ambient light sensor is higher. Meanwhile, the longer the irradiation time of the ambient light sensor by the external ambient light is, the higher the ambient brightness coefficient of the ambient light sensor is.
In a preferred embodiment of the present invention, the output light source 3 is an LED lamp set, and the light-emitting time constant is inversely related to the service life of the output light source 3.
Specifically, in this embodiment, the LED lamp sets are provided with two sets, and the input ends of the two sets of LED lamp sets are connected to the output end of the driving module 2.
In a preferred embodiment of the present invention, the relationship between the light emission time constant and the lifetime of the output light source 3 is configured as follows:
e＝t3/L；
wherein e is used for representing a light-emitting time constant;
l is used to represent the lifetime of the output light source 3;
t3the/L is used to indicate the light emission time cumulatively recorded by the output light source 3.
Specifically, in the present embodiment, the light emission time constant is inversely proportional to the service life of the output light source 3. The normal service life of the output light source 3 used in this embodiment is 7 ten thousand hours. The product of the light emission time and the service life is the light emission time cumulatively recorded by the output light source 3. Since the internal components of the output light source 3 gradually deteriorate as the light emission time becomes longer, the service life of the output light source 3 is inversely proportional to the light emission time with a fixed light emission time constant.
In a preferred embodiment of the present invention, a triode is disposed inside the driving module 2, the driving module 2 includes a drain current detection circuit 22, an input end of the drain current detection circuit 22 is connected to a drain of the triode, an output end of the drain current detection circuit 22 is connected to the control module 5, the drain current detection circuit 22 is configured to detect a real-time current flowing through the drain of the triode 21, and generate an alarm signal when the real-time current is greater than a preset current threshold, and the control module 5 stops driving the driving module 2 according to the alarm signal.
Specifically, in the present embodiment, the drain current detection circuit 22 includes a current transformer, a differential amplification circuit, and a chebyshev filter. The current transformer is coupled with a drain electrode of the triode, the current transformer is used for detecting real-time current on the drain electrode of the triode, an output end of the current transformer is connected with an input end of the differential amplification circuit, the differential amplification circuit is used for amplifying the real-time current according to a preset proportion, and an output end of the differential amplification circuit is connected with an input end of the Chebyshev filter. The Chebyshev filter is used for filtering the amplified real-time current to obtain the filtered real-time current so as to send the filtered real-time current to the control module 5.
The drain current of transistor 21 reflects the age of transistor 21. The current threshold is stored in advance in a nonvolatile memory inside the control module 5. When the drain current detection circuit 22 detects that the real-time current of the drain of the transistor 21 is greater than the current threshold, it indicates that the real-time current flowing through the drain of the transistor 21 is too large, which may indicate that the aging degree of the transistor 21 is too high. At this time, the control module 5 needs to control the driving module 2 to stop driving the output light source 3, so as to avoid damaging the output light pipe.
In a preferred embodiment of the present invention, the predetermined operation formula is configured as:
k1＝(a(t1-b％t2+t2％t1)+ct1)/(aU1+(b-c)U2)；
wherein k is1For representing the slope value of the waveform;
t1for representing an arbitrary first time;
U1for indicating a first actuation corresponding to a first timeA voltage;
t2for representing an arbitrary second time;
U2for representing a second driving voltage corresponding to a second time;
a is used for representing a preset first constant;
b is used for representing a preset second constant;
c is used for representing a preset third constant;
the first time is not equal to the second time, and the first driving voltage is not equal to the second driving voltage.
Specifically, in this embodiment, the first constant may be 1/2, the second constant may be 7, and the third constant may be 3.
In a preferred embodiment of the present invention, the second compensation wave is a step wave, as shown in fig. 5, and the second waveform generating unit 66 includes:
a differential subunit unit 661, where a configuration end of the differential subunit unit 661 is configured to receive the waveform peak, and an output end of the differential subunit unit 661 is configured to output a unit height of each layer of steps in the second compensation wave obtained by differentiating the waveform peak;
the generating subunit 662, a configuration end of the generating subunit 662 is configured to receive the unit height and the waveform slope value, and an output end of the generating subunit 662 is configured to output a second compensation wave processed according to the waveform slope value and the unit height.
Specifically, in the present embodiment, the differentiating subunit 661 may be a differentiating circuit, and the generating subunit 662 may be an integrating circuit. The input end of the differential circuit is connected with the output end of the dynamic comparator, and the differential circuit performs differential processing on the waveform peak value output by the dynamic comparator to obtain the unit height of each layer of steps. The output end of the differentiating circuit is connected with the configuration end of the integrating circuit. The configuration end of the integrating circuit is also connected with the output end of the arithmetic unit. The integrating circuit performs integration according to the waveform slope value obtained through operation and the unit height of the step obtained through differentiation to obtain a second compensation wave. The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims (7)

1. A strobe device for automatically adjusting the brightness of a light source, comprising:
the control module is used for generating a driving waveform;
the driving module is respectively connected with the control module and the at least one output light source and is used for driving the output light source to carry out stroboscopic light emitting according to the driving waveform and outputting a driving signal;
characterized in that, the stroboscopic device still includes:
the environment brightness detection module is connected with the control module and used for detecting the environment illumination intensity in the external environment so as to generate an environment illumination intensity value;
the control module generates a voltage threshold according to the ambient light intensity value;
the acquisition module is connected with the driving module and is used for acquiring the waveform of the driving signal;
the waveform generation module is respectively connected with the acquisition module, the control module and the driving module, and comprises:
the configuration end of the upper limit filtering unit is used for receiving the waveform of the driving signal, the output end of the upper limit filtering unit is used for outputting an upper limit filtering waveform generated according to the waveform of the driving signal, and the upper limit filtering waveform is a waveform of which the amplitude exceeds the voltage threshold value in the waveform of the driving signal;
an input end of the integrating unit is used for receiving the upper limit filtering waveform, and an output end of the integrating unit is used for outputting a filtered area numerical value which is obtained by integrating according to the upper limit filtering waveform and is used for reflecting the effective area of the upper limit filtering waveform;
the first waveform generating unit comprises a first configuration end and a second configuration end, wherein the first configuration end is used for receiving the filtered product value, and the second configuration end is used for outputting a first compensation wave generated according to the filtered product value;
the input end of the dynamic comparison unit is used for receiving the first compensation wave, and the output end of the dynamic comparison unit is used for outputting a difference waveform generated according to the first compensation wave and extracting a waveform peak value obtained from the difference waveform;
the operation unit is configured with a preset operation formula, and the output end of the operation unit is used for outputting a waveform slope value obtained by processing the waveform of the driving signal through the preset operation formula;
the second waveform generating unit comprises a third configuration end and a fourth configuration end, the third configuration end is used for receiving the waveform peak value, the fourth configuration end is used for receiving the waveform slope value, the output end of the second waveform generating unit is used for outputting a second compensation wave which is generated according to the waveform peak value and the waveform slope value and is used for reflecting the change rate of the second compensation wave;
a configuration end of the subtraction unit is used for receiving the first compensation wave and the second compensation wave, and an output end of the subtraction unit is used for outputting a compensation total waveform obtained by subtracting the first compensation wave from the second compensation wave;
the configuration end of the addition unit is used for receiving the compensation total waveform and the driving waveform, and the output end of the addition unit is used for outputting the compensated driving waveform obtained by summing the compensation total waveform and the driving waveform;
the driving module drives the output light source according to the compensated driving waveform so as to adjust the brightness of the output light source;
the strobe device further includes a light source detection module connected to the output light source, the light source detection module includes:
the output end of the timing unit is used for outputting the light-emitting time accumulated and recorded when the output light source emits light;
a storage unit, an input end of the storage unit is used for receiving the light-emitting time of the accumulated record, and an output end of the storage unit is used for outputting the light-emitting time of the saved accumulated record;
the control module adjusts the voltage threshold according to the light-emitting time recorded in an accumulated mode and a preset adjusting formula;
the preset adjustment formula is configured to:
U＝dB+et3 2；
wherein U is used to represent a voltage threshold;
d is used for representing a preset environment brightness coefficient;
e is used for representing a preset light-emitting time constant;
b is used for representing the ambient light intensity value;
t3for indicating the lighting time recorded cumulatively by the output light source;
the preset operation formula is configured as follows:
k1＝(a(t1-b％t2+t2％t1)+ct1)/(aU1+(b-c)U2)；
wherein k is1For representing the waveform slope value;
t1for representing an arbitrary first time;
U1for representing a first drive voltage corresponding to the first time;
t2for representing an arbitrary second time;
U2for representing a second driving voltage corresponding to the second time;
a is used for representing a preset first constant;
b is used for representing a preset second constant;
c is used for representing a preset third constant;
and if the first time is not equal to the second time, the first driving voltage is not equal to the second driving voltage.
2. The strobe device for automatically adjusting the brightness of a light source according to claim 1, wherein: the ambient brightness detection module is an ambient light sensor, and the ambient brightness coefficient is in positive correlation with the external ambient temperature.
3. The strobe device of claim 2, wherein: the relationship between the ambient brightness coefficient and the external ambient temperature is configured to:
d＝T*t4 2；
wherein d is used for representing the ambient brightness coefficient;
t is used to represent the external ambient temperature;
t4for indicating the illumination time of the external ambient light.
4. The strobe device for automatically adjusting the brightness of a light source according to claim 1, wherein: and if the output light source is an LED lamp group, the luminous time constant and the service life of the output light source are in a negative correlation relationship.
5. The strobe device for automatically adjusting brightness of a light source as claimed in claim 4, wherein: the relationship between the light emission time constant and the useful life of the output light source is configured to:
e＝t3/L；
wherein e is used for representing the light-emitting time constant;
l is used for representing the service life of the output light source;
t3for indicating the emission time cumulatively recorded by the output light source.
6. The strobe device for automatically adjusting the brightness of a light source according to claim 1, wherein:
the driving module is internally provided with a triode, the driving module comprises a drain current detection circuit, the input end of the drain current detection circuit is connected to the drain electrode of the triode, the output end of the drain current detection circuit is connected to the control module, the drain current detection circuit is used for detecting the real-time current flowing through the drain electrode of the triode, an alarm signal is generated when the real-time current is larger than a preset current threshold value, and the control module stops driving according to the alarm signal.
7. The strobe device for automatically adjusting the brightness of a light source according to claim 1, wherein: the second compensation wave is a step wave, and the second waveform generating unit includes:
a configuration end of the differential subunit is used for receiving the waveform peak value, and an output end of the differential subunit is used for outputting the unit height of each layer of step in the second compensation wave obtained by differential processing according to the waveform peak value;
and the configuration end of the generating subunit is used for receiving the unit height and the waveform slope value, and the output end of the generating subunit is used for outputting the second compensation wave obtained by processing according to the waveform slope value and the unit height.
CN202210046654.2A 2022-01-17 2022-01-17 Stroboscopic device capable of automatically adjusting brightness of light source Active CN114071843B (en)

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