The Importance of Proper Power Supply for Signal Jammers in Prisons

With the continuous development of technology, we have entered the era of informationization. Mobile phones, as a symbol of informationization, have become an indispensable tool in our daily lives and work. However, there are certain places where the use of mobile phones is prohibited. To prevent the use of mobile phones in these specific locations, full-band signal jammers have been developed. These devices can block mobile phone signals, preventing them from connecting to base stations and rendering them unable to receive service. For example, prisons install signal jammers to prevent inmates from using mobile phones to communicate with the outside world and to avoid information leakage and collusion. However, with the large number of signal jammers required in prisons, the issue of power supply needs to be addressed.

Power Consumption of Signal Jammers:

Most of the full-band signal jammers used in prisons are low-power devices. The RF transmission power of each frequency band is usually around 2-3W, and the total RF transmission power of the entire device is approximately 30W. The power consumption of a single full-band signal jammer is generally within the range of 120-200W. These signal jammers are equipped with a switch power supply (or power adapter) that converts the AC power of 220V into DC power of 5V or 12V to provide energy for the device.

Power Supply Challenges in Prisons:

In order to centrally control the power on/off of a large number of full-band signal jammers, the simplest solution is to connect the power supply of all signal jammers in each building to a single AC power line. However, the existing power supply in prisons is provided by DC power. This raises the question of how to solve the power supply issue for signal jammers in prisons.

The Infeasibility of Using Existing DC Power Lines:

Some customers have suggested using the existing DC power lines to supply power to the full-band signal jammers, in order to save costs on switch power supplies and power line arrangements. However, this approach is not feasible due to the high power consumption of each signal jammer. When powered by AC 220V, the current in the power line is close to 1A. When multiple signal jammers are connected in parallel on a single power line, the total current will gradually accumulate. If the power supply is changed to DC, based on the power consumption and the conversion between current and voltage, the current consumed by a single full-band signal jammer will reach 10-20A. When multiple signal jammers are connected in parallel on a DC power line, the total current will reach several hundred amperes, which clearly violates the proper use of electrical circuits.


In conclusion, the power supply for signal jammers in prisons is a crucial aspect that needs to be carefully considered. While it may seem convenient to use existing DC power lines, the high power consumption of signal jammers makes it infeasible. It is essential to ensure that the power supply for these devices is provided by a dedicated AC power line to meet safety standards and prevent any potential electrical hazards. By addressing the power supply challenges, prisons can effectively utilize full-band signal jammers to maintain security and prevent unauthorized mobile phone usage.