A power backup solution for NVR/DVR systems

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A power backup solution for NVR/DVR systems [Copy link]

 Figure 1 is a simple security system block diagram, which is mainly divided into front-end products and back-end products. The back-end product NVR (Network Video Record) is connected to the front-end IP camera. Generally, one NVR can connect to 4, 8, or 16 IPCs. In certain specific cases, the NVR system needs a short-term power-off backup to ensure that data is not lost. Therefore, the battery backup system of the NVR has become a research direction in the security industry. The DVR (Digital Video Recorder) is connected to the CVI/TVI/AHD analog camera. Although the transmission signal is an analog signal, the demand for the backup system is the same as that of the NVR. 85)]

Security system block diagram

[color=rgb(85, 85, Based on the above demand analysis, this paper proposes a simple backup power solution as follows: configure the battery as two cells in series and multiple cells in parallel, set the output voltage of the boost circuit to slightly lower than 12V, when the adapter is present, the input voltage is 12V, the input will be directly transmitted to the output end through the oring chip, and the battery will be charged through the charger to store energy in the battery, when the adapter is removed, the battery can power the system through the boost circuit to provide 12V. The specific chip solution is as follows. The commonly used oring chip is LM5050-1, which can improve the transmission efficiency. The charging chip can consider using BQ24610, which can support up to 6 batteries in series. The external mosfet can achieve high current charging and overall thermal performance improvement. The boost circuit can use LM5122 and TPS40210 commonly used in the security industry. LM5122 is a boost chip with synchronous rectification function, which can achieve higher efficiency, but the cost is slightly higher. TPS40210 is a commonly used asynchronous boost chip. The corresponding mosfet can be selected from CSD17510.

Backup power plan[/color ]

In fact, the above circuit can also be adjusted according to the actual needs of customers. For example, if the customer has very high requirements for the accuracy of the output 12V voltage during the entire change process, you can consider removing the oring circuit and only using the charger and boost circuits, so that the output voltage will always remain at 12V generated by the boost circuit. The disadvantage of this design is that the boost is always working with load, and the efficiency is lower than the previous solution, but the overall solution cost will be improved, and the output voltage will not change.

Adjust power backup plan

This battery backup solution is not limited to NVR/DVR systems, but can also be transplanted to other similar application systems. In addition, Ti has a variety of battery management chips and boost chips. For small currents, you can consider using a converter, and for large currents, you can consider using a controller, providing customers with flexible battery backup solutions.

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Thanks for sharing!