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An infrared night vision camera system

A camera system and night vision technology, which is applied in the field of infrared night vision camera system, can solve problems such as misoperation of LED lights, and achieve the effects of avoiding environmental interference, high integration, and good noise tolerance

Active Publication Date: 2018-01-23
深圳市纽艾迪电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the present invention proposes a light-controlled LED drive circuit, which uses a photosensitive hysteresis comparison module to compare the surrounding visual conditions detected by the thermistor with two critical thresholds, It solves the problem that the existing light-controlled LED drive circuit is easily affected by the environment and causes LED lights to malfunction

Method used

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  • An infrared night vision camera system
  • An infrared night vision camera system
  • An infrared night vision camera system

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Embodiment Construction

[0025] Below in conjunction with accompanying drawing and embodiment, further elaborate the present invention.

[0026] Such as figure 1 As shown, a light-controlled LED drive circuit includes a light-sensitive hysteresis comparison module 1 and an LED constant current drive module 2 .

[0027] The photosensitive hysteresis comparison module 1 and the LED constant current drive module 2 are connected in sequence. The photosensitive hysteresis comparison module 1 is used to control the LED constant current drive module 2 according to the sensed brightness. The LED constant current driving module 2 is used for driving LED lamps.

[0028] The photosensitive hysteresis comparison module 1 senses the surrounding brightness, converts the brightness signal into a voltage signal, and then compares the voltage signal with the reference voltage; 2 Provide the working voltage for the LED lamp, and the LED lamp lights up. If it is determined that it is daytime, the photosensitive hyst...

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Abstract

The invention discloses a light-controlled LED drive circuit, which comprises a photosensitive hysteresis comparison module and an LED constant current drive module. The photosensitive hysteresis comparison module includes a photosensitive unit, an operational amplifier unit, a reference voltage unit, and a voltage dividing unit. The photosensitive unit is connected with the inverting input end of the operational amplifier unit; the output end of the operational amplifier unit is connected with the non-inverted input end of the operational amplifier unit through a voltage dividing unit. The voltage dividing unit is connected with the reference voltage. The output end of the operational amplification unit is connected with the LED constant current drive module. The LED constant current drive module is used to drive LED lamps. The circuit uses the photosensitive hysteresis comparison module to use the hysteresis comparison circuit to compare the surrounding visual conditions detected by the thermistor with two critical thresholds, which can obtain better noise tolerance to avoid environmental interference, so that the light control of the LED more reliable.

Description

technical field [0001] The invention relates to the technical field of LED driving, in particular to an infrared night vision camera system. Background technique [0002] The light-controlled LED drive circuit uses the characteristic of the photoresistor that the resistance value of the photoresistor is larger when there is no light and smaller when there is light, to judge the surrounding visual situation, and automatically drive the LED light at night or when the visibility is low It has the advantages of intelligence, convenience and low cost. [0003] Infrared night vision camera systems often use light-controlled LED drive circuits to control infrared LED lights to automatically light up at night to achieve infrared night vision cameras. [0004] However, the existing light-controlled LED driving circuit or infrared night vision camera system is easily disturbed by the surrounding environment when sensing the surrounding visual situation, causing the LED lights to malf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00
Inventor 何冠军
Owner 深圳市纽艾迪电子科技有限公司