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How to choose the power supply of the video surveillance system in the weak current project

by:Keyable     2021-08-07
How to choose the power supply of the video surveillance system in the weak current project. The choice of power supply is indeed more important in the weak current. Many friends have asked the question of power configuration many times, so today we will understand the choice and configuration of the power supply. 1. Surveillance cameras are marked with DC12V/AC24V universal. What kind of power supply should I choose? Answer: Choose AC24V monitoring power supply, because the same transmission distance, the higher the voltage, the smaller the loss. When the voltage is high, the load can get a sufficient voltage. At the same time, due to the use of AC 24V, power synchronization can be selected when debugging the camera, so that the image field frequencies of different devices in the entire monitoring system can be synchronized. 2. How to reasonably configure the power of the surveillance cameras of the entire surveillance system? Answer: This problem often embarrassed young and inexperienced engineers. When implementing many schemes, it was found that the power capacity originally designed was not enough, and additional equipment was needed, which caused a problem with Party A. In fact, since the camera has a large startup current at the moment of startup, plus the loss of long-distance transmission in engineering, the power supply required by the surveillance camera is not simply the sum of the rated power of all cameras. The correct approach is to add up the rated power of the cameras of the entire surveillance system and multiply by 1.3 times. This is the actual power required by the surveillance cameras, and then add about 30% of the loss; finally add 30% of the margin, Used for future expansion. For example: If a business building has 100 fixed gun cameras, each surveillance camera has a power of 5W (generally 5W cameras, high-end cameras range from 10W to 50W), how do we configure the camera power supply? According to the above calculation method, we calculated that the rated power of the surveillance camera is 5W*100u003d500W. The actual power used by the camera is 500W*1.3u003d650W. After considering the loss, the power required by the surveillance camera is 650W*1.3u003d845W plus Power supply margin, the final power supply that the surveillance camera needs to configure is 845W*1.3u003d1098W (this is a sufficient consideration) summarized as follows: The power supply that the surveillance camera needs to configure u003d the rated power of the camera*1.3*1.3*1.3 (Note: If the monitoring distance is particularly long, you need to appropriately increase the power supply and increase the power supply voltage) 3. What is the most taboo for the configuration of the power supply of the surveillance camera? Answer: The most taboo is that the entire monitoring system shares one power source. The reasons are as follows: ① When the system is repaired, it is often necessary to turn on and turn off the power. All surveillance cameras start at the same time when the power is turned on. The starting current is extremely large, which has a great impact on the power supply, and it will burn the power supply in serious cases. ②All surveillance cameras share a power supply. When the power supply fails, the entire closed-circuit surveillance system is paralyzed. Especially the images of some important entrances and exits cannot be monitored, which may cause unnecessary trouble. So what should be the correct approach? As in the above example, a business building has 100 fixed surveillance cameras, a total of about 1,098W power supply is needed. The correct configuration should be to select 5 power supplies, each with a 200W power supply. In this way, when a certain power supply fails, cameras at important entrances and exits can be connected to other good power supplies without affecting the operation of the entire system. 4. What issues should be paid attention to when choosing the power supply of surveillance cameras? Answer: First, when connecting the camera to the power supply, do not connect the remote camera and the closer surveillance camera to the same power supply. If it is connected to the same power supply, the power supply voltage is high, it will burn the camera at a close distance, the power supply voltage is low, and the camera at a far distance will have no image. You should try to connect the remote surveillance cameras to the same power supply, and connect the closer cameras to the same power supply. Second: If the monitoring distance is too far, you need to configure a higher voltage power supply, such as 30V, 36V, etc., or even directly supply 220V AC power, and then transform the voltage to the front end. Chengdu Weak Current Project--Chengdu Ruiminle Technology Co., Ltd. is a company that integrates Sichuan and Chengdu monitoring system installation and maintenance, monitoring equipment, camera camera installation, home security monitoring, access control system, weak current engineering, integrated wiring, video monitoring, alarm system, anti-theft system , Smart home as a multi-faceted technical service company, to provide you with satisfactory solutions. Welcome to inquire!
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