CN213990760U - Infrared lamp regulating circuit and law enforcement record appearance - Google Patents
Infrared lamp regulating circuit and law enforcement record appearance Download PDFInfo
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- CN213990760U CN213990760U CN202022020065.6U CN202022020065U CN213990760U CN 213990760 U CN213990760 U CN 213990760U CN 202022020065 U CN202022020065 U CN 202022020065U CN 213990760 U CN213990760 U CN 213990760U
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Abstract
The utility model discloses an infrared lamp regulating circuit and law enforcement record appearance, this infrared lamp regulating circuit includes infrared lamp subassembly, environment light detection circuitry, distance detection circuit and infrared lamp control circuit, wherein, environment light detection circuitry is arranged in the luminous intensity of check out test environment, and output light intensity detected signal, distance detection circuit is used for detecting the distance between surveyed target and the infrared lamp subassembly, and output distance detected signal, infrared lamp control circuit is connected with environment light detection circuitry and distance detection circuit respectively, infrared lamp control circuit is used for according to luminous intensity detected signal and the work of distance detection signal output control infrared lamp subassembly, and adjust the luminance of infrared lamp subassembly. The utility model aims to solve the problem that the infrared lamp can not automatically adjust the brightness of the infrared lamp under different scenes (such as cloudy days, night, early morning and evening or indoor and outdoor), and always works with large power consumption.
Description
Technical Field
The utility model relates to a law enforcement record appearance field, in particular to infrared lamp regulating circuit and law enforcement record appearance.
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.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an infrared lamp regulating circuit, the utility model discloses aim at solving the problem that infrared lamp can not automatically regulated infrared lamp luminance and big consumption work always under different scenes.
In order to achieve the above object, the utility model provides an infrared lamp regulating circuit, this infrared lamp regulating circuit 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.
In one embodiment, the integrated chip is STK 3311.
The utility model discloses still include a law enforcement record appearance, including foretell infrared lamp regulating circuit.
The utility model discloses among the technical scheme, infrared lamp regulating circuit includes infrared banks spare, ambient light detection circuitry, distance detection circuit and infrared lamp control circuit, wherein, ambient light detection circuitry is arranged in the luminous intensity of check out test environment to output light intensity detected signal, distance detection circuit be used for detecting by the measuring target with distance between the infrared lamp subassembly, and output distance detected signal, infrared lamp control circuit respectively with ambient light detection circuitry and distance detection circuit connect, infrared lamp control circuit is used for according to luminous intensity detected signal and distance detected signal output control infrared lamp subassembly work, and adjust the luminance of infrared banks spare. The technical scheme of the utility model, utilize environment light detection circuitry and distance detection circuitry to judge the service environment of law enforcement record appearance in coordination, learn law enforcement record appearance external environment more truthfully, the accurate regulation that carries out infrared lamp subassembly can make the camera on the law enforcement record appearance have good shooting effect under different light intensity always, the problem of the work of big consumption always that infrared lamp luminance can not automatically regulated under different scenes (for example: cloudy day, night, early morning evening or indoor outdoor) on the better solution law enforcement record appearance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be 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 schematic diagram of functional modules of an embodiment of an infrared lamp adjusting circuit according to the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of the infrared lamp control circuit of the present invention;
fig. 3 is a schematic circuit diagram of another embodiment of the infrared lamp adjusting circuit of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | |
400 | Infrared |
| 200 | Ambient |
410 | |
| 300 | |
420 | Switching circuit |
The purpose of the present invention is to provide a novel and improved method and apparatus for operating a computer.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, 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 motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; 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 meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to 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, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides an infrared lamp regulating circuit is applied to in the 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.
In order to solve the above problem, refer to fig. 1 to 3, in an embodiment of the present invention, the utility model discloses an infrared lamp regulating circuit for law enforcement record appearance, the utility model discloses an infrared lamp regulating circuit 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.
The technical scheme of the utility model, utilize environment light detection circuitry 200 and distance detection circuitry 300 to judge the service environment of law enforcement record appearance in coordination, learn law enforcement record appearance external environment more really, the accurate regulation that carries out infrared lamp subassembly 100, can make the camera on the law enforcement record appearance have good shooting effect under different light intensities always, better solution law enforcement record appearance goes up infrared lamp subassembly 100 and can not automatically regulated infrared lamp luminance and the problem of big consumption work always under different scenes (cloudy day, night, early morning evening or indoor outdoor).
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 feedback pin VFB of the driving chip U1000 is used for controlling the maximum of the infrared lamp assembly 100 according to the resistance of the third resistor R3Outputting a current value; 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. 1 to 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. 1 to 3, 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 utility model also provides a law enforcement record appearance (not shown in the figure), this law enforcement record appearance include the infrared lamp regulating circuit of above-mentioned embodiment, and the concrete structure of this law enforcement record appearance refers to above-mentioned embodiment, because this law enforcement record appearance has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the perk is no longer repeated here.
The above is only the optional embodiment of the present invention, and not the scope of the present invention is limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, or the direct/indirect application in other related technical fields is included in the patent protection 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 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. The infrared lamp adjustment circuit of claim 1, wherein the distance detection circuit is integrated with the ambient light detection circuit in the same integrated chip.
9. The infrared lamp adjusting circuit according to claim 8, wherein the integrated chip is model number STK 3311.
10. A law enforcement recorder comprising an infrared lamp conditioning circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022020065.6U CN213990760U (en) | 2020-09-15 | 2020-09-15 | Infrared lamp regulating circuit and law enforcement record appearance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022020065.6U CN213990760U (en) | 2020-09-15 | 2020-09-15 | Infrared lamp regulating circuit and law enforcement record appearance |
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| Publication Number | Publication Date |
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| CN213990760U true CN213990760U (en) | 2021-08-17 |
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| CN202022020065.6U Active CN213990760U (en) | 2020-09-15 | 2020-09-15 | Infrared lamp regulating circuit and law enforcement record appearance |
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2020
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