CN210294776U - Camera infrared lamp drive circuit and infrared lamp - Google Patents
Camera infrared lamp drive circuit and infrared lamp Download PDFInfo
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- CN210294776U CN210294776U CN201921545553.XU CN201921545553U CN210294776U CN 210294776 U CN210294776 U CN 210294776U CN 201921545553 U CN201921545553 U CN 201921545553U CN 210294776 U CN210294776 U CN 210294776U
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Abstract
The utility model provides a camera infrared lamp drive circuit, including driver chip U2, diode D1, sampling resistor R7, R8 and R9, power output filter capacitor C1, power input filter capacitor C2, power inductance L1, divider resistance R17 and R18, filter capacitor C5 and LED input; the input end is connected with a first pin of a driving chip U2 through a diode D1; the input end is connected with the LED input end through a diode D1; the second pin of the driving chip U2 is grounded, and the third pin of the driving chip U2 is connected between the ground wire and the second pin of the driving chip U2; the fourth pin of the driving chip U2 is grounded through a voltage dividing resistor R17; one end of the voltage dividing resistor R18 is connected between the fourth pin of the driver chip U2 and the voltage dividing resistor R17, and the other end of the voltage dividing resistor R18 is connected to the PWM. The utility model discloses can solve camera infrared lamp effectively and shine closely the object and appear the problem that the picture excessively explodes.
Description
Technical Field
The utility model relates to an electronic information technical field especially relates to a camera infrared lamp drive circuit and infrared lamp.
Background
The infrared camera is capable of seeing objects clearly at night because the camera is equipped with an infrared lamp source according to different lens millimeters. Infrared lamps typically emit near infrared light with a peak wavelength of 850 nm. Like visible light, infrared light decreases in illumination brightness with increasing distance. The reduction of night vision noise in the visible distance of the infrared camera can be achieved only by increasing the power of an infrared lamp or increasing the aperture of a lens, using a high-quality optical filter and the like. After the camera uses the infrared lamp, the whole night vision effect is greatly improved, and the product with good performance has no difference from the daytime color definition except that the video image is black and white. The infrared lamp technology is continuously improved, and a solid foundation is laid for the wider application of the camera by the development of the infrared lamp technology from the early LED infrared lamp to the mainstream lamp sources, dot matrix lamps and laser lamps in the current market.
At present, camera products in the market cannot fundamentally solve the problem of overexposure when an infrared camera irradiates a high-reflectivity object at a short distance.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a camera infrared lamp drive circuit and infrared lamp can solve camera infrared lamp effectively and shine closely the object and appear the picture problem of exploding.
In order to achieve the above object, in one aspect, the embodiment of the present invention provides a camera infrared lamp driving circuit, which includes a driving chip U2, a diode D1, a sampling resistor R7, R8, R9 and R23, a power output filter capacitor C1, a power input filter capacitor C2, a power inductor L1, voltage dividing resistors R17 and R18, a filter capacitor C5 and an LED input end;
the voltage input end is connected with the first pin of the driving chip U2 through the diode D1; the input end is connected with the LED input end through the diode D1; the second pin of the driving chip U2 is grounded, and the third pin of the driving chip U2 is connected between the ground line and the second pin of the driving chip U2;
the fourth pin of the driving chip U2 is grounded through the divider resistor R17; one end of the voltage dividing resistor R18 is connected between the fourth pin of the driving chip U2 and the voltage dividing resistor R17, and the other end of the voltage dividing resistor R18 is connected with PWM; the filter capacitor C5 is connected in parallel with the voltage dividing resistor R17, and one end of the filter capacitor C5 is connected with the voltage dividing resistor R18;
a fifth pin of the driving chip U2 is connected with a voltage input end; a sixth pin of the driving chip U2 is connected with an LED input end; the sampling resistors R7, R8, R9 and R23 are respectively connected in parallel between the fourth pin and the fifth pin of the driving circuit;
the power output filter capacitor C1 is connected with the LED input end in parallel, one end of the power input filter capacitor C2 is grounded, and the other end of the power input filter capacitor C2 is connected with one end of the sampling resistor R8.
Further, the diode D1 is a freewheeling diode.
Further, the driving chip is a SY8707 chip.
In another aspect, another embodiment of the present invention provides an infrared lamp including a camera infrared lamp driving circuit.
The embodiment of the utility model provides a camera infrared lamp drive circuit can solve camera infrared lamp effectively and shine closely the object and appear the picture problem of exploding.
Drawings
Fig. 1 is a schematic structural diagram of an infrared lamp driving circuit of a camera according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a driving chip of an infrared lamp driving circuit of a camera according to an embodiment of the present invention.
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.
Referring to fig. 1-2, an embodiment of the present invention provides a camera infrared lamp driving circuit, including a driving chip U2, a diode D1, a sampling resistor R7, R8, R9 and R23, a power output filter capacitor C1, a power input filter capacitor C2, a power inductor L1, a voltage dividing resistor R17 and R18, a filter capacitor C5, and an LED input end;
the voltage input end is connected with a first pin of the driving chip U2 through a diode D1; the input end is connected with the LED input end through a diode D1; the second pin of the driving chip U2 is grounded, and the third pin of the driving chip U2 is connected between the ground wire and the second pin of the driving chip U2;
the fourth pin of the driving chip U2 is grounded through a voltage dividing resistor R17; one end of the voltage dividing resistor R18 is connected between the fourth pin of the driving chip U2 and the voltage dividing resistor R17, and the other end of the voltage dividing resistor R18 is connected with the PWM; the filter capacitor C5 is connected with the voltage dividing resistor R17 in parallel, and one end of the filter capacitor C5 is connected with the voltage dividing resistor R18;
the fifth pin of the driving chip U2 is connected with the voltage input end; a sixth pin of the driving chip U2 is connected with the LED input end; the sampling resistors R7, R8, R9 and R23 are respectively connected in parallel between the fourth pin and the fifth pin of the driving circuit;
the power output filter capacitor C1 is connected in parallel with the LED input end, one end of the power input filter capacitor C2 is grounded, and the other end of the power input filter capacitor C2 is connected with one end of the sampling resistor R8.
The embodiment of the utility model provides an in, driver chip U2 is SY8707 chip, and this chip supports maximum input voltage 30V, and the MOSFET and the internal compensation loop of the low internal resistance of internal integration support maximum output infrared lamp drive current 1.5A, and the output current accessible outside sampling resistance Rsen of infrared lamp sets up, supports the simulation function of adjusting luminance. Referring to fig. 2, the first PIN1 LX is connected to the power inductor; the second PIN PIN2 GND is a power ground; a third PIN PIN3 TM is a test mode PIN, and is grounded in practical application; the fourth PIN PIN4EN/ADIM is a chip enable and analog dimming voltage input PIN, when the PIN voltage is lower than 0.65V, the chip stops working, and when the PIN voltage is adjusted from 0.65V to 1.2V, the chip outputs the driving current of the infrared lamp, and the driving current of the infrared lamp is increased to 100% from 5% of the set current; a fifth PIN PIN5 IN is a power supply input PIN and is connected with the positive terminal of the current sampling resistor Rsen; the sixth PIN PIN6 SEN is connected to the negative terminal of the current sampling resistor Rsen.
Referring to fig. 1, D1 is a freewheeling diode, R7, R8, R9 and R23 are infrared lamp driving current sampling resistors, driving current I is 0.1/(R7IIR8IIR9IIR23), C2 is an input power filter capacitor, C1 is a power output filter capacitor, L1 is a power inductor, R17 and R18 are voltage dividing resistors, and C5 is a filter capacitor. The embodiment of the utility model provides an in, when camera infrared lamp shines closely the object, the duty cycle of controller MCU accessible control PWM signal, the voltage of fourth PIN PIN4EN ADIM of control driver chip U2 to the output current of control infrared lamp realizes the control to infrared lamp luminance, can effectively solve camera infrared lamp and shine closely the object and appear the problem that the picture is too exploded.
It can be understood that when night vision is performed, the filter IRCUT in the camera is switched to the full-transmission lens, the infrared lamp is lightened, and when the detected picture is lower than the preset brightness, the power of the infrared lamp is improved through the infrared lamp driving circuit of the camera, so that the purpose of far irradiation is achieved; when the fact that the picture is higher than the set brightness (namely, an object is close to or an external light source is used for supplementing light) is detected, the infrared power is reduced through the camera infrared lamp driving circuit, the effect that the object at a close place can be clearly visible is achieved, and the problem that the picture is over-exploded when the camera infrared lamp irradiates the object at a close place can be effectively solved.
As a specific implementation manner of the embodiment of the present invention, the diode D1 is a freewheeling diode.
As a specific implementation manner of the embodiment of the present invention, the driving chip is a SY8707 chip.
Implement the embodiment of the utility model provides a, following beneficial effect has:
the embodiment of the utility model provides a through MCU control PWM signal's duty cycle, the voltage of fourth PIN PIN4EN ADIM of control driver chip U2 to control infrared lamp's output current, realize the control to infrared lamp luminance, can effectively solve the camera infrared lamp and shine closely the object and appear the problem that the picture was crossed explosively.
Another embodiment of the present invention provides an infrared lamp, including the infrared lamp driving circuit of the above-mentioned camera.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (4)
1. A camera infrared lamp driving circuit is characterized by comprising a driving chip U2, a diode D1, sampling resistors R7, R8 and R9, a power output filter capacitor C1, a power input filter capacitor C2, a power inductor L1, voltage dividing resistors R17 and R18, a filter capacitor C5 and an LED input end;
the voltage input end is connected with the first pin of the driving chip U2 through the diode D1; the voltage input end is connected with the LED input end through the diode D1; the second pin of the driving chip U2 is grounded, and the third pin of the driving chip U2 is connected between the ground line and the second pin of the driving chip U2;
the fourth pin of the driving chip U2 is grounded through the divider resistor R17; one end of the voltage dividing resistor R18 is connected between the fourth pin of the driving chip U2 and the voltage dividing resistor R17, and the other end of the voltage dividing resistor R18 is connected with PWM; the filter capacitor C5 is connected in parallel with the voltage dividing resistor R17, and one end of the filter capacitor C5 is connected with the voltage dividing resistor R18;
a fifth pin of the driving chip U2 is connected with the voltage input end; a sixth pin of the driving chip U2 is connected with an LED input end; the sampling resistors R7, R8, R9 and R23 are respectively connected in parallel between the fourth pin and the fifth pin of the driving circuit;
the power output filter capacitor C1 is connected with the LED input end in parallel, one end of the power input filter capacitor C2 is grounded, and the other end of the power input filter capacitor C2 is connected with one end of the sampling resistor R8.
2. The camera infrared lamp driving circuit according to claim 1, wherein the diode D1 is a freewheeling diode.
3. The camera infrared lamp driving circuit according to claim 2, characterized in that the driving chip is a SY8707 chip.
4. An infrared lamp comprising the camera infrared lamp driving circuit according to any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921545553.XU CN210294776U (en) | 2019-09-17 | 2019-09-17 | Camera infrared lamp drive circuit and infrared lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921545553.XU CN210294776U (en) | 2019-09-17 | 2019-09-17 | Camera infrared lamp drive circuit and infrared lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210294776U true CN210294776U (en) | 2020-04-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921545553.XU Active CN210294776U (en) | 2019-09-17 | 2019-09-17 | Camera infrared lamp drive circuit and infrared lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210294776U (en) |
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2019
- 2019-09-17 CN CN201921545553.XU patent/CN210294776U/en active Active
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