Liquid cooled cooling solution for 5G base stations


With the development of mobile Internet, many people with low head begin to hold mobile phones and indulge in games, videos, shopping, chat and other entertainment activities. When people enjoy the convenience brought by mobile Internet, they are familiar with the development of communication networks.

What is 5G?

 

                                                                  

 

The development of 2G communication networks has given birth to WAP web browsers such as UC; The development of 3G communication networks has enriched people's communication and led to the rise of instant messaging software such as WeChat; With the development of 4G communication network, the spread of short videos and online videos has emerged, creating super APPs such as Tiktok, and making talented people become popular webmasters; So what surprises will the upcoming 5G communication network bring to people?

As the fifth generation mobile communication system, 5G's main advantages lie in large transmission bandwidth and low latency: the maximum bandwidth can reach 10Gbit/s, and the amount of data transmitted is 100 times that of 4G; The network latency is less than 1 millisecond, while 4G is 30-70 milliseconds. With greater data transmission, 5G networks will not only serve mobile phones, but also connect more intelligent devices such as shared bicycles, smart cars, smart cameras, smart door locks, smart lighting fixtures, etc., and society will enter the IoT era. The low latency characteristics of 5G make intelligent manufacturing factories, unmanned driving, remote high-definition medical surgeries, and more possible.

5G? Introduction to base stations

At present, there are 26 5G networks worldwide, which may increase to 60 by 2020. China alone will have 1 million 5G base stations by 2020. There are two main types of 5G base stations, one is macro base station and the other is micro base station.

 

                                                                              

 

BBU includes control unit, transmission unit, and baseband processing unit, mainly responsible for signal filtering, OFDM, modulation and demodulation, frequency domain processing (symbol mapping/de mapping and MIMO equalization, etc.), CPRI, DPD (digital pre distortion processing) and other functions.

AAU is actually the RRU+antenna in the 4G era. Its main function is to convert baseband digital signals into analog signals, then modulate them into high-frequency RF signals, and then amplify the power through the power amplifier unit and transmit them through the antenna.

 

                                                          

 

        

With the continuous development of mobile communication services, massive amounts of data need to be processed, and transmission rates need to be doubled. The power consumption of BBU and AUU in 5G base stations will gradually increase. The power consumption of 5G base stations has reached 2.5-3.5 times that of 4G base stations, and the increase in AUU power consumption is the main reason for the increase in 5G power consumption. At present, the full load power of a single station is nearly 3700W.

5G? Base Station Cooling Challenge

The increase in power consumption of 5G base stations will mean an increase in heat generation, which will lead to an increase in chip temperature.

Traditional cooling solutions

1. Reduce the temperature difference between the chip and the casing by using high thermal conductivity interface materials and thermal bridging thermal blocks or heat pipes;

2. Reduce the surface temperature of the casing, increase the volume of the equipment casing, optimize the design of the cooling blades, and increase the surface area;

3. Improve the uniformity of shell temperature by using cast aluminum thickened shell;

In actual products, the improvement effect of Scheme 1 is limited. When the shell is exposed to sunlight, its surface temperature can reach as high as 60 ℃ to 90 ℃. However, many chips require Tc to be within 90 ℃, which will not meet the heat dissipation requirements; For options 2 and 3, there are usually certain limitations on the appearance size and weight of the product, and it cannot be increased arbitrarily. Therefore, 5G cooling will be a great challenge.

5G base station liquid cooling solution

In order to better solve the heat dissipation problems of 5G base stations and supercomputing centers, the Xiangbo R&D team strives for excellence and ingenuity, breaking the traditional thinking of heat dissipation solutions. They have innovatively developed liquid cooled heat dissipation modules specifically for 5G base stations and supercomputing centers. Through structural design, thermal simulation analysis, experimental verification, and continuous optimization and improvement of the flow channel and temperature field, a successful product was ultimately developed.

technical parameter

A single CPU has a heat dissipation power of 100W-300W, an inlet and outlet temperature difference of 1-5 ℃, and a pressure drop of 5-20kPa.

Technical advantages

1. The temperature difference between CPUs is small;

2. The temperature difference between CPU and heat sink is small;

3. The temperature distribution of the radiator is uniform, and the surface temperature difference is small;

4. Multiple primary and secondary heating devices for one-stop liquid cooling and heat dissipation;

5G base station cooling case

 

                              

 

For the improvement of the temperature uniformity performance of the 5G base station casing, an aluminum temperature equalization plate has been developed, which achieves temperature equalization function through internal phase change working fluid. The cost is much lower than that of copper temperature equalization plates, and it can also achieve large-area temperature equalization effect.

In addition to the research and development of liquid cooled cooling modules for 5G base stations and supercomputing centers, the Xiangbo R&D team is also conducting continuous technical research and exploration in the field of new energy vehicle cooling technology. At the same time, we also delve into the micro world to solve the surface corrosion problem of radiators from the source.

Xiangbo Heat Transfer is an innovation driven thermal management solution provider with a complete R&D process, professional R&D team, and strong technical strength. It has first-class welding technology and international certification qualifications. From traditional radiator components to the latest cutting-edge technologies such as 5G and hydrogen energy vehicle thermal management, Xiangbo people have always been the most active.