A kind of led supplementary light control circuit for rolling shutter exposure camera

Abstract

The invention discloses an LED light supplement control circuit used for a roller-shutter-type shutter exposure camera. The circuit comprises a light supplement lamp source, a power supply circuit portion and a control circuit portion. The power supply circuit portion comprises a rectifier B, a flyback switch conversion circuit K and an output filtering energy storage capacitor C13 which are successively connected. The control circuit portion comprises a flyback switch conversion control circuit DL1, a low voltage conversion direct current circuit DL2, an output voltage control circuit DL3, a power control circuit DL4, a MAX485 conversion circuit DL5, a single chip microcomputer control circuit DL6 and a trigger logic circuit DL7. The circuit has advantages that a trigger response speed is rapid; a constant current effect of a LED light source is good; and constant bright power of an LED light supplement lamp source and high light power during a light supplement process can be set.

Description

technical field [0001] The invention relates to a monitoring camera circuit, in particular to an LED supplementary light control circuit for a rolling shutter exposure camera. Background technique [0002] The rolling shutter exposure camera has become an important camera equipment in the surveillance system and is playing an increasingly important role because it can capture the scene clearly under low illumination conditions. In the process of taking pictures, strong light is needed to shoot the scene clearly. Since the rolling shutter exposure camera adopts progressive sequential exposure, the supplementary light needs to work in a constant current state, and the trigger response time of the supplementary light is very important. Yes, it needs to be turned on and off quickly when the camera is triggered. [0003] In the prior art, the supplementary light of the rolling shutter exposure camera is mainly LED constant light. When the camera sends a trigger command, the LED ...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the supplementary light of the rolling shutter exposure camera is mainly the LED constant light. When the camera sends a trigger command, the LED constant light cannot adjust the brightness of the supplementary light, and it is difficult to obtain clear pictures.

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