Current digital circuit applications in the automotive circuit more and more. Some models in the installation of reversing cameras often run into reverse image jitter, interference, or not to switch reversing screen. The following are the reasons causing these problems and solutions. For your reference. (Currently encountered are: Sike Da Hao Rui, Ming Rui, Sagitar, Magotan, BMW 5 Series, Cadillac, LaCrosse, etc.) First, the failure reasons: U.S. Department of German cars and some models of cars, the engine started, the output voltage interfere with a larger power supply to the reversing light is not pure DC power supply, but a pulse signal superimposed on top of the oscilloscope can be used if the conditional test , you will find is a similar square wave signal. If the reversing camera with no filter (it was also called rectifiers), camera power supply line directly in the reverse light on the working voltage is unstable because the camera is not working properly led, the output of the video signal is also not normal, so the host to see there is a serious interference, jitter, or not to switch reversing screen. Second, the solution: 1, plus relay (relay connected in series in the regular fire and power between the reversing camera, with reversing light power to control the relay switch), plus the relay after the general solve the above problem. Because more then relay connection, if there is vibration, and other interference problems throwing your connection according to the following two points: ① often fire directly access the battery relay ② video camera ground power ground and ride directly to the body iron 99% of the above two connection to solve the problem, such as the small amount of ripple can refer to a way to add the next RC or LC filter circuit. 2, plus filter circuit: (no additional relay) This method is the reverse light power line plus a filter circuit, the pulse power filter, the formation of DC power (the figure above the red line is the filtered waveform), give the camera power supply. So that you can completely eliminate the interference with horizontal stripes on the screen.
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Interference Solution for Rear view camera
Date:2013-7-8 9:55:18