CN111953884A - Infrared lamp adjusting circuit, law enforcement recorder and infrared lamp control method - Google Patents

Infrared lamp adjusting circuit, law enforcement recorder and infrared lamp control method Download PDF

Info

Publication number
CN111953884A
CN111953884A CN202010970085.1A CN202010970085A CN111953884A CN 111953884 A CN111953884 A CN 111953884A CN 202010970085 A CN202010970085 A CN 202010970085A CN 111953884 A CN111953884 A CN 111953884A
Authority
CN
China
Prior art keywords
infrared lamp
circuit
lamp assembly
ambient light
resistor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010970085.1A
Other languages
Chinese (zh)
Inventor
宋德周
潘天宇
舒晓明
王文贺
唐颖杰
孙明
杜燊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Jimi Iot Co ltd
Original Assignee
Shenzhen Jimi Iot Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Jimi Iot Co ltd filed Critical Shenzhen Jimi Iot Co ltd
Priority to CN202010970085.1A priority Critical patent/CN111953884A/en
Publication of CN111953884A publication Critical patent/CN111953884A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/56—Cameras or camera modules comprising electronic image sensors; Control thereof provided with illuminating means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H04N23/71—Circuitry for evaluating the brightness variation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/30—Transforming light or analogous information into electric information
    • H04N5/33—Transforming infrared radiation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • 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
    • 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]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/345—Current stabilisation; Maintaining constant current

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The invention discloses an infrared lamp adjusting circuit, a law enforcement recorder and a control method of an infrared lamp, wherein the infrared lamp adjusting circuit comprises an infrared lamp assembly, an ambient light detection circuit, a distance detection circuit and an infrared lamp control circuit, wherein the ambient light detection circuit is used for detecting light intensity in the environment and outputting a light intensity detection signal, the distance detection circuit is used for detecting the distance between a detected object and the infrared lamp assembly and outputting a distance detection signal, the infrared lamp control circuit is respectively connected with the ambient light detection circuit and the distance detection circuit, and the infrared lamp control circuit is used for controlling the infrared lamp assembly to work according to the light intensity detection signal and the distance detection signal output and adjusting the brightness of the infrared lamp assembly. The invention aims to solve the problem that the infrared lamp can not automatically adjust the brightness of the infrared lamp in different scenes (such as cloudy days, night, early morning and evening or indoor and outdoor scenes) and always works with large power consumption.

Description

Infrared lamp adjusting circuit, law enforcement recorder and infrared lamp control method
Technical Field
The invention relates to the field of law enforcement recorders, in particular to an infrared lamp adjusting circuit, a law enforcement recorder and a control method of an infrared lamp.
Background
Law enforcement record appearance is the law enforcement record of the various indoor and outdoor places of law enforcement personnel of generally being applied to, makes law enforcement record appearance can reach clear video recording effect in order to satisfy the wide-angle camera under dark environment or other operational environment light supplement degree, generally need shine the target with the infrared lamp, and the infrared ray gets into the camera lens formation of image after the object reflection, consequently, the infrared lamp has vital effect in law enforcement record appearance.
At present, law enforcement record appearance has two kinds to open the infrared lamp mode, one kind opens the infrared lamp mode and is for opening through the button is manual, and to some illegal facts that go out to lose in the twinkling of an eye, the mode of manual opening not only delays law enforcement time, but also the risk of forgetting to open the infrared lamp still exists, it is fixed to lead to in time collecting evidence, another kind opens the infrared lamp mode and is detecting external illumination intensity through light sensing element and carries out the mode of opening automatically, this moment, if article such as clothing accessory shelter from light sensing element can cause the malfunction and the problem of opening the infrared lamp automatically, can increase law enforcement record appearance's consumption like this. In addition, the law enforcement recorder can work in cloudy day, night, early morning evening or the environment of sudden darkness and staggered light and shade, but the brightness can not be adjusted along with the environmental change after the infrared lamp is started, so that the infrared lamp is always started with high current and high brightness, and the power consumption is very high with the heating.
Disclosure of Invention
The invention mainly aims to provide an infrared lamp adjusting circuit, and aims to solve the problem that the infrared lamp cannot automatically adjust the brightness of the infrared lamp in different scenes (such as cloudy days, night, early morning and evening or indoor and outdoor scenes) and always works with high power consumption.
In order to achieve the above object, the present invention provides an infrared lamp adjusting circuit, which includes:
an infrared lamp assembly;
the environment light detection circuit is used for detecting the light intensity in the environment and outputting a light intensity detection signal;
the distance detection circuit is used for detecting the distance between a detected target and the infrared lamp assembly and outputting a distance detection signal;
the infrared lamp control circuit is respectively connected with the ambient light detection circuit and the distance detection circuit and is used for outputting and controlling the infrared lamp assembly to work according to the light intensity detection signal and the distance detection signal and adjusting the brightness of the infrared lamp assembly.
In one embodiment, the infrared lamp control circuit comprises:
the main control chip is respectively connected with the ambient light detection circuit and the distance detection circuit and is used for outputting corresponding control signals according to the light intensity detection signals and the distance detection signals;
the input end of the PWM conversion circuit is connected with the main control chip, and the PWM conversion circuit is used for converting the received control signal into a PWM control signal and outputting the PWM control signal;
the input end of the switch circuit is connected with the output end of the PWM conversion circuit, the output end of the switch circuit is connected with the infrared lamp component, and the switch circuit controls the brightness of the infrared lamp component according to the PWM conversion control signal.
In one embodiment, the PWM conversion circuit includes a power input terminal, a switching tube, a first resistor and a second resistor;
the first end of the first resistor is the input end of the PWM conversion circuit, the second end of the first resistor is connected with the controlled end of the switch tube, the output end of the switch tube is connected with the power input end, the input end of the switch tube is grounded, and the common end of the switch tube and the power input end is the output end of the PWM conversion circuit.
In one embodiment, the switch circuit comprises a driving chip, a third resistor, a fourth resistor and a first capacitor;
a PWM dimming control pin of the driving chip is connected with an output end of the PWM conversion circuit, a feedback pin of the driving chip is connected with a first end of a third resistor, a second end of the third resistor is connected with a grounding pin of the driving chip and is grounded, a power supply pin of the driving chip, a first end of a first capacitor and a first end of a fourth resistor are connected with each other, a second end of the first capacitor is grounded, a second end of the fourth resistor is connected with an input end of the infrared lamp assembly, and an output end of the infrared lamp assembly is connected with the driving pin of the driving chip;
the driving chip feedback pin is used for controlling the maximum output current value of the infrared lamp component according to the resistance value of the third resistor;
and the PWM dimming control pin of the driving chip is used for controlling the on-off of the driving pin of the driving chip according to the high level or the low level output by the PWM control signal, and outputting a duty ratio according to the PWM control signal to change the brightness of the infrared lamp assembly when the driving pin of the driving chip is on.
In one embodiment, the infrared lamp assembly includes a first infrared lamp and a second infrared lamp;
the anode of the first infrared lamp is the input end of the infrared lamp assembly, the cathode of the first infrared lamp is connected with the anode of the second infrared lamp, and the cathode of the second infrared lamp is the output end of the infrared lamp assembly.
In an embodiment, the ambient light detection circuit comprises an ambient light detection sensor or an ambient light detection chip.
In an embodiment, the distance detection circuit includes a distance detection sensor or a distance detection chip.
The invention also comprises a law enforcement recorder which comprises the infrared lamp adjusting circuit.
The invention also comprises a control method of the infrared lamp, which is applied to the infrared lamp adjusting circuit or the law enforcement recorder, and the control method of the infrared lamp comprises the following steps:
acquiring an ambient light intensity detection signal and a distance detection signal between a detected target and the infrared lamp assembly;
and outputting a PWM control signal according to the ambient light intensity detection signal and the distance detection signal so as to control the brightness of the infrared lamp assembly.
In one embodiment, the step of outputting a PWM control signal to control the brightness of the infrared lamp assembly according to the received ambient light intensity detection signal and distance detection signal includes:
when the infrared lamp reaches the starting condition according to the ambient light intensity value and the preset ambient light intensity value when the infrared lamp assembly is started, and when no shielding object is determined between the detected target and the infrared lamp assembly according to the distance detection signal, the infrared lamp assembly is controlled to be started; and the number of the first and second groups,
and outputting PWM control signals with corresponding sizes according to the size of the ambient light intensity value so as to control the brightness of the infrared lamp assembly.
In the technical scheme of the invention, the infrared lamp adjusting circuit comprises an infrared lamp assembly, an ambient light detection circuit, a distance detection circuit and an infrared lamp control circuit, wherein the ambient light detection circuit is used for detecting the light intensity in the environment and outputting a light intensity detection signal, the distance detection circuit is used for detecting the distance between a detected object and the infrared lamp assembly and outputting a distance detection signal, the infrared lamp control circuit is respectively connected with the ambient light detection circuit and the distance detection circuit, and the infrared lamp control circuit is used for controlling the infrared lamp assembly to work according to the light intensity detection signal and the distance detection signal output and adjusting the brightness of the infrared lamp assembly. According to the technical scheme, the environment light detection circuit and the distance detection circuit are utilized to judge the use environment of the law enforcement recorder in a cooperative mode, the external environment of the law enforcement recorder is known more truly, the infrared lamp assembly is adjusted accurately, a camera on the law enforcement recorder can have a good shooting effect under different light intensities, and the problem that the infrared lamp on the law enforcement recorder cannot automatically adjust the brightness of the infrared lamp under different scenes (cloudy days, dark night, early morning and evening or indoor and outdoor) and works with large power consumption is solved better.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of an embodiment of an infrared lamp adjusting circuit according to the present invention;
FIG. 2 is a schematic circuit diagram of an infrared lamp control circuit according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of another embodiment of an infrared lamp adjustment circuit of the present invention;
fig. 4 is a first flowchart of an embodiment of a method for controlling an infrared lamp according to the present invention;
fig. 5 is a second flowchart of an embodiment of a method for controlling an infrared lamp according to the present invention.
The reference numbers illustrate:
reference numerals Name (R) Reference numerals Name (R)
100 Infrared lamp assembly 400 Infrared lamp control circuit
200 Ambient light detection circuit 410 PWM conversion circuit
300 Distance detection circuit 420 Switching circuit
The objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides an infrared lamp adjusting circuit which is applied to a law enforcement recorder.
At present, law enforcement record appearance has two kinds to open the infrared lamp mode, one kind opens the infrared lamp mode and is for opening through the button is manual, and to some illegal facts that go out to lose in the twinkling of an eye, the mode of manual opening not only delays law enforcement time, but also the risk of forgetting to open the infrared lamp still exists, it is fixed to lead to in time collecting evidence, another kind opens the infrared lamp mode and is detecting external illumination intensity through light sensing element and carries out the mode of opening automatically, this moment, if article such as clothing accessory shelter from light sensing element can cause the malfunction and the problem of opening the infrared lamp automatically, can increase law enforcement record appearance's consumption like this. In addition, the law enforcement recorder can work in cloudy day, night, early morning evening or the environment of sudden darkness and staggered light and shade, but the brightness can not be adjusted along with the environmental change after the infrared lamp is started, so that the infrared lamp is always started with high current and high brightness, and the power consumption is very high with the heating.
In order to solve the above problem, referring to fig. 1 to 3, in an embodiment of the present invention, an infrared lamp adjusting circuit of the present invention is used for a law enforcement recorder, and the infrared lamp adjusting circuit of the present invention includes:
an infrared lamp assembly 100;
an ambient light detection circuit 200 for detecting light intensity in an environment and outputting a light intensity detection signal;
a distance detection circuit 300 for detecting a distance between a target to be detected and the infrared lamp assembly 100 and outputting a distance detection signal;
and the infrared lamp control circuit 400 is respectively connected with the ambient light detection circuit 200 and the distance detection circuit 300, and the infrared lamp control circuit 400 is used for outputting and controlling the infrared lamp assembly 100 to work according to the light intensity detection signal and the distance detection signal and adjusting the brightness of the infrared lamp assembly 100. The infrared lamp control circuit 400 is a circuit board or a single chip microcomputer with a central control function, and may also be other editable logic devices, which is not limited herein.
It should be noted that, the infrared lamp assembly 100 may be implemented by using one or a combination of LED infrared lamps, array infrared lamps, or laser infrared lamps, and by providing the infrared lamp assembly 100, even in a dark condition, the law enforcement recorder can also shoot objects invisible to the naked eye, so as to improve the practicability of the law enforcement recorder, it should be noted that the infrared lamp assembly 100 may not only operate in a dark environment, but also in some other embodiments, the infrared lamp assembly 100 may operate in dark environments such as cloudy day, night, early morning, or evening, and the like, and the disclosure is not limited specifically herein; the light sensing element arranged on the ambient light detection circuit 200 can automatically detect the light intensity in the environment, and is convenient to use; in addition, in order to prevent the ambient light detection circuit 200 from detecting the intensity of light in the environment reaching the condition that the infrared lamp assembly 100 is turned on due to the light sensing element being blocked by clothing accessories or other objects when in use, so that the infrared lamp assembly 100 is automatically turned on and electric energy is wasted, the distance detection circuit 300 may be configured to detect the distance between the object to be detected and the infrared lamp assembly 100, and output a distance detection signal to determine whether there is a blocking object, and the distance between the object to be detected and the infrared lamp assembly 100 may be set according to requirements, such as the minimum distance between people or the minimum distance between people and objects. For example, when there is no occlusion, the distance detection circuit 300 outputs a signal value indicating the distance between the target under test and the infrared lamp assembly 100, and when there is an occlusion, the distance detection circuit 300 outputs a signal value indicating the distance between the target under test and the infrared lamp assembly 100. The condition for turning on the infrared lamp assembly 100 is set according to the user's requirement, and is not limited herein; for example, when the light intensity detected by the ambient light detection circuit 200 has reached the on condition, but the distance detection circuit 300 detects and outputs the distance detection signal to determine that the photosensitive element is provided with the blocking object, this indicates that the ambient light near the law enforcement recorder is dark due to the blocking of the blocking object, so that the light intensity detected by the ambient light detection circuit 200 has reached the on condition. In order to avoid false start, in this embodiment, the infrared lamp control circuit 400 determines that the law enforcement recorder is shielded at this time according to the light intensity detection signal and the distance detection signal, so as to output a control signal to turn off the infrared lamp assembly 100, and at this time, the infrared lamp assembly 100 does not operate, so that the infrared lamp assembly 100 is not turned on, that is, the waste of electric energy is reduced. When the light intensity detected by the ambient light detection circuit 200 has reached the turn-on condition and the distance detection circuit 300 detects the output distance detection signal to determine that there is no blocking object on the photosensitive element, it indicates that the surrounding environment is at night or the user enters a dark space, and it is necessary to turn on infrared light, the infrared lamp control circuit 400 determines that the ambient light is dark according to the light intensity detection signal and the distance detection signal, and outputs a control signal to turn on the infrared lamp assembly 100, and in addition, the infrared lamp control circuit 400 can also be used to adjust the brightness of the infrared lamp assembly 100 according to the magnitude of the control signal to save electricity; for example, in some environments with flickering or staggered brightness and darkness, the brightness of the infrared lamp assembly 100 after being turned on can be adjusted along with the change of the ambient light intensity, so that the infrared lamp assembly 100 cannot be turned on with high current and high brightness all the time, and the power consumption is saved.
In the technical scheme of the invention, the environment light detection circuit 200 and the distance detection circuit 300 are utilized to cooperatively judge the use environment of the law enforcement recorder, so that the external environment of the law enforcement recorder can be known more truly, the infrared lamp assembly 100 can be adjusted accurately, a camera on the law enforcement recorder can always have a good shooting effect under different light intensities, and the problem that the infrared lamp assembly 100 on the law enforcement recorder cannot automatically adjust the brightness of the infrared lamp and always works with large power consumption under different scenes (cloudy days, dark night, early morning and evening or indoor and outdoor) is solved better.
In an embodiment of the present invention, referring to fig. 1 to 3, the infrared lamp control circuit 400 includes:
a main control chip (not shown in the figure) connected to the ambient light detection circuit 200 and the distance detection circuit 300, respectively, and configured to output a corresponding control signal according to the light intensity detection signal and the distance detection signal;
the input end of the PWM conversion circuit 410 is connected to the main control chip, and the PWM conversion circuit 410 is configured to convert the received control signal into a PWM control signal and output the PWM control signal; the PWM conversion circuit 410 may be implemented by using a conversion chip or by using a switch device and a resistor element, which is not limited herein;
the input end of the switch circuit 420 is connected to the output end of the PWM conversion circuit 410, the output end of the switch circuit 420 is connected to the infrared lamp assembly 100, and the switch circuit 420 converts the control signal according to the PWM to control the brightness of the infrared lamp assembly 100. It should be noted that the switch circuit 420 may be implemented by using a separate switch control chip or a driving chip in combination with a switch element, and is not limited herein. The brightness of the infrared lamp assembly 100 can be intelligently adjusted according to the brightness of the external environment through the infrared lamp control circuit 400, so that manual operation is not needed and electric energy is saved.
Specifically, referring to fig. 1 to 3, in an embodiment, the PWM conversion circuit 410 includes a power input terminal VCC, a switching tube Q1, a first resistor R1, and a second resistor R2; the switching tube Q1 may be a transistor, a MOS transistor, an IGBT, or the like, and is not limited in this respect.
A first end of the first resistor R1 is an input end of the PWM conversion circuit 410, a second end of the first resistor R1 is connected to a controlled end of the switching tube Q1, an output end of the switching tube Q1 is connected to a power input end VCC, an input end of the switching tube Q1 is grounded, and a common end of the switching tube Q1 and the power input end VCC is an output end of the PWM conversion circuit 410, in this embodiment, the switching tube Q1 is implemented by an NPN triode; the voltage of the power input terminal VCC is 3.3V, and since the high level output by the signal output terminal IR _ SW _ EN controlled by the infrared lamp control circuit 400 is 1.8V, and the high level required to be input by the input terminal of the switch circuit 420 is above 3V, the PWM conversion circuit 410 can be set as required to adjust the brightness of the infrared lamp assembly 100 by controlling the signal output terminal IR _ SW _ EN controlled by the infrared lamp control circuit 400 to output the high level or the low level; for example, when the IR _ SW _ EN outputs a high level, the switch Q1 is turned on, the output end of the PWM switching circuit 410 outputs a low voltage, and when the IR _ SW _ EN outputs a low level, the switch Q1 is turned off, the output end of the PWM switching circuit 410 outputs a high voltage.
Further, in an embodiment, the switch circuit 420 described with reference to fig. 1 to 3 includes a driving chip U1000, a third resistor R3, a fourth resistor R4, and a first capacitor C1; in this embodiment, the driving chip U1000 is a low-dropout adjustable LED constant current driving chip U1000, and the specific model is IC _ THD5T50, which supports PWM dimming with a maximum frequency of 200KHz, so that the dimming range is wider.
A PWM dimming control pin DIM of the driver chip U1000 is connected to an output terminal of the PWM conversion circuit 410, a feedback pin VFB of the driver chip U1000 is connected to a first end of the third resistor R3, a second end of the third resistor R3 is connected to a ground pin GND of the driver chip U1000 and is grounded, a power supply pin VCC of the driver chip U1000, a first end of the first capacitor C1 and a first end of the fourth resistor R4 are connected to each other, a second end of the first capacitor C1 is grounded, a second end of the fourth resistor R4 is connected to an input terminal of the infrared lamp assembly 100, and an output terminal of the infrared lamp assembly 100 is connected to a drive pin DRV of the driver chip U1000;
the driving chip U1000 feedback pin VFB is configured to control a maximum output current value of the infrared lamp assembly 100 according to a resistance value of the third resistor R3; for example, in the present embodiment, formula I is calculated according toLEDThe output voltage of the feedback pin VFB of the driving chip U1000 is 300mV/R3, and when the resistance of the third resistor R3 is 1 ohm, the current flowing through the infrared lamp assembly 100 is 300mA, in other embodiments, the third resistor R3 may have other resistance values according to different requirements of users, which is not specifically limited herein.
The PWM dimming control pin DIM of the driving chip U1000 is configured to control the on/off of the driving pin DRV of the driving chip U1000 according to the high level or the low level output by the PWM control signal, and output the duty ratio according to the PWM control signal to change the brightness of the infrared lamp assembly 100 when the driving pin of the driving chip U1000 is on. For example, when the intensity of the external ambient light is dim and is not dim due to a shelter, the output duty ratio of the PWM control signal is increased to increase the brightness of the infrared lamp, and conversely, when the intensity of the external ambient light becomes bright, the output duty ratio of the PWM control signal is decreased to decrease the brightness of the infrared lamp assembly 100, that is, the current of the infrared lamp can be changed by adjusting the output duty ratio of the PWM control signal, so as to achieve the purpose of adjusting the brightness, and thus, the infrared lamp assembly 100 does not waste electric energy due to the fact that the infrared lamp assembly 100 is always operated under high power.
In the present embodiment, referring to fig. 3, the infrared lamp assembly 100 includes a first infrared lamp LED1 and a second infrared lamp LED 2;
the anode of the first infrared lamp LED1 is the input end of the infrared lamp assembly 100, the cathode of the first infrared lamp LED1 is connected with the anode of the second infrared lamp LED2, and the cathode of the second infrared lamp LED2 is the output end of the infrared lamp assembly 100. In other embodiments, the infrared lamp assembly 100 may also be configured as one infrared lamp, three infrared lamps or more infrared lamps, which is not limited herein.
In an embodiment, the ambient light detection circuit 200 includes an ambient light detection sensor or an ambient light detection chip, which is specifically set according to a user requirement, and is not limited herein.
In an embodiment, the distance detection circuit 300 includes a distance detection sensor or a distance detection chip, which is set according to a user requirement, and is not limited herein.
In addition, in an embodiment, referring to fig. 2, in order to reduce the use of devices and simplify the circuit wiring and the device arrangement of the circuit board, the ambient light detection circuit 200 and the distance detection circuit 300 may be implemented by using a common circuit, that is, the distance detection circuit 300 and the ambient light detection circuit 200 are integrated in the same integrated chip, which is beneficial to improving the integration level of the law enforcement recorder circuit and reducing the volume of the circuit board. Moreover, when the distance detection circuit 300 and the ambient light detection circuit 200 are integrated on the same integrated chip, the number of peripheral circuits of the integrated chip is small, the number of devices can be reduced, the size of a circuit board of the law enforcement recorder can be further reduced, the law enforcement recorder can be developed to be light and miniaturized, and the cost of the law enforcement recorder can be reduced. The common circuit comprises an ambient light sensor, a short-distance detection sensor U1103, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a second capacitor C2 and a third capacitor C3, wherein the ambient light sensor and the short-distance detection sensor U1103 can not only detect the intensity of ambient light, but also detect the distance between a detected object and the infrared lamp assembly 100, the model of the ambient light sensor and the short-distance detection sensor U1103 is STK3311-X, specifically, the power supply terminal VDD of the ambient light sensor and the short-distance detection sensor U1103, the first terminal of the second capacitor C2 and the first terminal of the sixth resistor R6 are interconnected, the second terminal of the sixth resistor R6 is connected with the first power supply terminal VIO28_ PMU of the infrared lamp control circuit 400, the first power supply terminal VIO28_ PMU is connected with 2.8V to supply power, and the IIC communication pin and the short-distance detection sensor U are respectively connected with the infrared lamp control circuit 400 through the SDA 400 The signal pins are connected, the ambient light sensor and the short-distance detection sensor U1103 communicate the collected data with the infrared lamp control circuit 400 through the IIC protocol, the GND terminals of the ambient light sensor and the short-distance detection sensor U1103 are grounded, the interrupt terminal INT of the ambient light sensor and the short-distance detection sensor U1103 is connected with the VIO18_ PMU terminal of the infrared lamp control circuit 400 through a fifth resistor R5, wherein the fifth resistor R5 is an interrupt pull-up pin, and the ambient light sensor and the short-distance detection sensor U1103 can be controlled to collect the light intensity in the detection environment or detect the distance between the detected object and the infrared lamp assembly 100 at regular intervals by combining some software programs, wherein the specific time is set according to the user requirements, and no limitation is made here, and in addition, the third pin and the fourth pin of the ambient light sensor and the short-distance detection sensor U1103 are connected, the fifth pin of the ambient light sensor and the short-distance detection sensor U1103 is connected to the first end of the seventh resistor R7, the second end of the seventh resistor R7 and the first end of the third capacitor C3 are connected to the VBAT end of the infrared lamp control circuit 400, the second end of the third capacitor C3 is grounded, it should be noted that the sixth resistor R6 and the seventh resistor R7 are current-limiting resistors, and the second capacitor C2 and the third capacitor C3 are filter capacitors.
The invention further provides a law enforcement recorder (not shown in the figure), which comprises the infrared lamp adjusting circuit of the embodiment, and the specific structure of the law enforcement recorder refers to the embodiment.
In an embodiment, referring to fig. 1 to 5, the infrared lamp adjusting circuit includes an infrared lamp assembly 100, an ambient light detection circuit 200, a distance detection circuit 300, and an infrared lamp control circuit 400, and the infrared lamp control method includes the following steps:
step S10, acquiring an ambient light intensity detection signal and a distance detection signal between a detected target and the infrared lamp assembly 100;
in step S20, a PWM control signal is outputted according to the ambient light intensity detection signal and the distance detection signal to control the brightness of the infrared lamp assembly 100.
In the present scheme, the ambient light intensity detection signal can be obtained by the ambient light detection circuit 200, then the distance detection signal between the detected target and the infrared lamp assembly 100 can be obtained by the distance detection circuit 300, so that it is prevented that when in use, the clothing accessories or other objects block the photosensitive elements to cause the light intensity in the environment detected by the ambient light detection circuit 200 to reach the condition of opening the infrared lamp assembly 100, so that the infrared lamp assembly 100 is automatically opened and the electric energy is wasted, finally, the infrared lamp control circuit 400 outputs the PWM control signal according to the ambient light intensity detection signal and the distance detection signal, so as to control the brightness of the infrared lamp assembly 100, that is, even in a dim or staggered environment, the brightness of the infrared lamp assembly 100 after being opened can be adjusted along with the change of the ambient light intensity, and a brightness is not always maintained, therefore, the infrared lamp assembly 100 cannot be turned on with high current and high brightness all the time, which saves power consumption, and it should be noted that the infrared lamp assembly 100 can not only work in dim or staggered environment, but also work in dark environment such as cloudy day, dark night, early morning or evening, or even no light environment in some other embodiments, and the present disclosure is not limited specifically; the environment light detection circuit 200 and the distance detection circuit 300 are utilized to judge the service environment of the law enforcement recorder in a cooperative manner, so that the external environment of the law enforcement recorder is known more truly, the infrared lamp assembly 100 is adjusted accurately, a camera on the law enforcement recorder can have a good shooting effect under different light intensities, and the problem that the infrared lamp assembly 100 on the law enforcement recorder cannot automatically adjust the brightness of the infrared lamp under different scenes (cloudy days, dark night, early morning and evening or indoor and outdoor) and works with large power consumption is solved better.
In an embodiment, referring to fig. 5, the step of outputting a PWM control signal according to the received ambient light intensity detection signal and distance detection signal to control the brightness of the infrared lamp assembly 100 includes:
step S21, when the infrared lamp reaches the starting condition according to the ambient light intensity value and the preset ambient light intensity value when the infrared lamp assembly 100 is started, and when it is determined that no shielding object exists between the detected object and the infrared lamp assembly 100 according to the distance detection signal, the infrared lamp assembly 100 is controlled to be started;
step S22, outputting a PWM control signal with a corresponding magnitude according to the magnitude of the ambient light intensity value, so as to control the brightness of the infrared lamp assembly 100.
Firstly, the infrared lamp control circuit 400 determines that the infrared lamp reaches the starting condition according to the ambient light intensity value and the preset ambient light intensity value when the infrared lamp assembly 100 is started, and controls the infrared lamp assembly 100 to be started when it is determined that no shielding object exists between the target to be detected and the infrared lamp assembly 100 according to the distance detection signal; when the infrared lamp assembly 100 is turned on, the preset ambient light intensity value is determined according to the user requirement, and is not limited herein, and then the infrared lamp control circuit 400 outputs a PWM control signal with a corresponding magnitude according to the magnitude of the ambient light intensity value to control the brightness of the infrared lamp assembly 100; that is to say, when the external environment is darker and not because the environment that the object sheltered from and arouses is dark, infrared lamp subassembly 100 reaches the condition of opening infrared, infrared lamp subassembly 100 can detect the ambient light intensity value always, when detecting external environment and darkening gradually, the duty cycle of the PWM of infrared lamp control circuit 400 control PWM control signal output crescent in order to increase infrared lamp subassembly 100's luminance, when detecting external environment and brightening gradually, the duty cycle of the PWM of infrared lamp control circuit 400 control PWM control signal output reduces gradually in order to avoid extravagant electric energy, furthermore, can close infrared lamp subassembly 100 when infrared lamp control circuit 400 detects the ambient light intensity value and does not satisfy the condition of opening of infrared lamp, so, can realize automated control, practice thrift the electric energy.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. An infrared lamp adjustment circuit for a law enforcement recorder, comprising:
an infrared lamp assembly;
the environment light detection circuit is used for detecting the light intensity in the environment and outputting a light intensity detection signal;
the distance detection circuit is used for detecting the distance between a detected target and the infrared lamp assembly and outputting a distance detection signal;
the infrared lamp control circuit is respectively connected with the ambient light detection circuit and the distance detection circuit and is used for outputting and controlling the infrared lamp assembly to work according to the light intensity detection signal and the distance detection signal and adjusting the brightness of the infrared lamp assembly.
2. An infrared lamp adjustment circuit according to claim 1, characterized in that the infrared lamp control circuit comprises:
the main control chip is respectively connected with the ambient light detection circuit and the distance detection circuit and is used for outputting corresponding control signals according to the light intensity detection signals and the distance detection signals;
the input end of the PWM conversion circuit is connected with the main control chip, and the PWM conversion circuit is used for converting the received control signal into a PWM control signal and outputting the PWM control signal;
the input end of the switch circuit is connected with the output end of the PWM conversion circuit, the output end of the switch circuit is connected with the infrared lamp component, and the switch circuit controls the brightness of the infrared lamp component according to the PWM conversion control signal.
3. The infrared lamp adjusting circuit according to claim 2, wherein the PWM conversion circuit includes a power input terminal, a switching tube, a first resistor and a second resistor;
the first end of the first resistor is the input end of the PWM conversion circuit, the second end of the first resistor is connected with the controlled end of the switch tube, the output end of the switch tube is connected with the power input end, the input end of the switch tube is grounded, and the common end of the switch tube and the power input end is the output end of the PWM conversion circuit.
4. The infrared lamp adjusting circuit according to claim 2, wherein the switching circuit includes a driving chip, a third resistor, a fourth resistor, and a first capacitor;
a PWM dimming control pin of the driving chip is connected with an output end of the PWM conversion circuit, a feedback pin of the driving chip is connected with a first end of a third resistor, a second end of the third resistor is connected with a grounding pin of the driving chip and is grounded, a power supply pin of the driving chip, a first end of a first capacitor and a first end of a fourth resistor are connected with each other, a second end of the first capacitor is grounded, a second end of the fourth resistor is connected with an input end of the infrared lamp assembly, and an output end of the infrared lamp assembly is connected with the driving pin of the driving chip;
the driving chip feedback pin is used for controlling the maximum output current value of the infrared lamp component according to the resistance value of the third resistor;
and the PWM dimming control pin of the driving chip is used for controlling the on-off of the driving pin of the driving chip according to the high level or the low level output by the PWM control signal, and outputting a duty ratio according to the PWM control signal to change the brightness of the infrared lamp assembly when the driving pin of the driving chip is on.
5. The infrared lamp adjustment circuit of claim 4, wherein the infrared lamp assembly comprises a first infrared lamp and a second infrared lamp;
the anode of the first infrared lamp is the input end of the infrared lamp assembly, the cathode of the first infrared lamp is connected with the anode of the second infrared lamp, and the cathode of the second infrared lamp is the output end of the infrared lamp assembly.
6. The infrared lamp adjustment circuit of claim 1, wherein the ambient light detection circuit comprises an ambient light detection sensor or an ambient light detection chip.
7. The infrared lamp adjusting circuit according to claim 1, wherein the distance detecting circuit includes a distance detecting sensor or a distance detecting chip.
8. A law enforcement recorder comprising an infrared lamp conditioning circuit as claimed in any one of claims 1 to 7.
9. A method for controlling an infrared lamp, applied to an infrared lamp adjusting circuit according to any one of claims 1 to 7 or a law enforcement recorder according to claim 8, characterized in that the method for controlling an infrared lamp comprises the following steps:
acquiring an ambient light intensity detection signal and a distance detection signal between a detected target and the infrared lamp assembly;
and outputting a PWM control signal according to the ambient light intensity detection signal and the distance detection signal so as to control the brightness of the infrared lamp assembly.
10. The infrared lamp control method of claim 9, wherein the step of outputting a PWM control signal to control the brightness of the infrared lamp assembly according to the received ambient light intensity detection signal and distance detection signal comprises:
when the infrared lamp reaches the starting condition according to the ambient light intensity value and the preset ambient light intensity value when the infrared lamp assembly is started, and when no shielding object is determined between the detected target and the infrared lamp assembly according to the distance detection signal, the infrared lamp assembly is controlled to be started; and the number of the first and second groups,
and outputting PWM control signals with corresponding sizes according to the size of the ambient light intensity value so as to control the brightness of the infrared lamp assembly.
CN202010970085.1A 2020-09-15 2020-09-15 Infrared lamp adjusting circuit, law enforcement recorder and infrared lamp control method Pending CN111953884A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010970085.1A CN111953884A (en) 2020-09-15 2020-09-15 Infrared lamp adjusting circuit, law enforcement recorder and infrared lamp control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010970085.1A CN111953884A (en) 2020-09-15 2020-09-15 Infrared lamp adjusting circuit, law enforcement recorder and infrared lamp control method

Publications (1)

Publication Number Publication Date
CN111953884A true CN111953884A (en) 2020-11-17

Family

ID=73356215

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010970085.1A Pending CN111953884A (en) 2020-09-15 2020-09-15 Infrared lamp adjusting circuit, law enforcement recorder and infrared lamp control method

Country Status (1)

Country Link
CN (1) CN111953884A (en)

Similar Documents

Publication Publication Date Title
US6820998B2 (en) Energy saving type of light emitting diode lamp
JP5937328B2 (en) Dimmable LED lighting fixture
CN108040387B (en) Light detection device and illumination device
CN216626113U (en) Illumination circuit and illumination equipment capable of self-adapting to environment adjustment
CN111712009A (en) LED lamp with dimming function
CN108966410A (en) A kind of LED light controller, LED light and its control method
CN213990760U (en) Infrared lamp regulating circuit and law enforcement record appearance
CN111953884A (en) Infrared lamp adjusting circuit, law enforcement recorder and infrared lamp control method
JP2013084519A (en) Dimming controlled led lighting fixture
CN207298454U (en) Induction type light bulb
CN216531870U (en) Light sensing switch circuit and light sensing system
CN107461622A (en) induction type bulb
CN212183778U (en) LED lamp strip
CN220108256U (en) Induction lamp strip and lighting equipment
CN216752150U (en) Anti-light interference lighting circuit and lighting system
CN211378307U (en) Backlight automatic regulating circuit and remote controller
CN212367576U (en) LED lamp with dimming function
CN218416727U (en) Learning environment monitoring circuit based on photochromic resolution
CN218603674U (en) Human body induction lighting circuit and lighting equipment
CN216357391U (en) Human body induction lighting circuit and lighting equipment
CN216391484U (en) Human body induction night lamp
CN216357394U (en) Drive control device and lighting apparatus bloies
CN220629613U (en) Multifunctional table lamp control circuit
CN108566701A (en) The LED controller integrated circuit of self-induction self-regulated
CN210274605U (en) Dimming control system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination