Automatic aperture driving circuit and electronic device

A technology of automatic aperture and driving circuit, which is applied in the direction of TV, electrical components, color TV, etc., can solve the problems of not controlling the aperture adjustment speed and unsatisfactory adjustment effect, and achieve good adjustment effect

Active Publication Date: 2017-07-14
BEIJING KUANGSHI TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this solution can control the aperture size, it does not control the aperture adjustment speed. When the ambient light changes drastically, the adjustment effect is not ideal.

Method used

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  • Automatic aperture driving circuit and electronic device
  • Automatic aperture driving circuit and electronic device
  • Automatic aperture driving circuit and electronic device

Examples

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Embodiment Construction

[0050] In the following description, numerous specific details are given in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without one or more of these details. In other examples, some technical features known in the art are not described in order to avoid confusion with the present invention.

[0051] It should be understood that the invention can be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0052] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the / the" are intended to include...

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PUM

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Abstract

The invention provides an automatic aperture driving circuit and an electronic device. The automatic aperture driving circuit comprises a front-end processor, a first digital-to-analog conversion module, a first comparison module, a second digital-to-analog conversion module and a second comparison module, the first digital-to-analog conversion module receives the first digital code from the front-end processor and generates a first analog voltage, the non-inverting input end of the first comparison module receives the first analog voltage output by the first digital-to-analog conversion module, the inverting input end of the first comparison module receives the reference voltage value, the first comparison module compares the first analog voltage with the reference voltage value to control the aperture change speed, the second digital-to-analog conversion module receives the second digital code from the front-end processor and generates a second analog voltage, and the second comparison module compares the second analog voltage with the feedback voltage fed back by the second comparison module to control the opening size of the aperture. The circuit of the present invention can precisely control the opening size of the aperture and the aperture rotation speed.

Description

technical field [0001] The invention relates to the technical field of security monitoring, in particular to an automatic aperture driving circuit and an electronic device. Background technique [0002] Cameras are widely used in major shopping malls, hotels, schools, traffic intersections, residential quarters, office places and other places to monitor these places daily and play a role in security. [0003] Security cameras usually use automatic aperture lenses. As the light changes, the camera automatically adjusts the aperture size according to the light changes, so that the image brightness remains basically the same. DC drive aperture (DC-iris) is a special type of aperture, which is controlled by the camera and can automatically adjust the amount of incoming light. It belongs to the current mainstream aperture drive circuit. Generally, there are four signals on the DC drive automatic aperture connector: damping positive (damping +), damping negative (damping -), driv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/238
CPCH04N23/75
Inventor 冯宝库
Owner BEIJING KUANGSHI TECH
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