The communication power source is the energy library of the server and the base station communication, and provides power for various transmission devices to ensure the normal operation of the communication system. The communication power system accounts for a relatively small proportion in the entire communication industry, but it is the key infrastructure of the entire communication network. It is a complete and irreplaceable key component of the communication network. There are many types of communication power products, which are generally concentrated in the equipment room, as shown in Figure 1.
Figure 1: Communication power room
At present, the mainstream communication power supply has the following parameters:
• Input voltage AC: 90-264V 50/60Hz
• Output power: 2kw
• Output: maximum voltage 12V/164.2A
• Power density: 26.14w/Cu.Inch.
• Efficiency: 93%
Shiqiang Marketing Manager said: "In the communication power supply requires high efficiency, high power density, small size, light weight, low cost, some engineers use a variety of power segments and level into high power, communication power supply is mainly controlled by rectification PFC, reverse Variable and rectified three large block components, to improve efficiency and power density must reduce losses, there are several topologies in the front-end controllable rectification PFC part, ZVT PFC, bridgeless PFC, interleaved parallel PFC and SiC hard switch PFC. In so many topologies, in addition to SiC hard-switching PFC, several other control methods are very complicated, so engineers are more interested in SiC hard-switching PFC in the new generation of mainstream design." Hard-switching circuit composed of SiC devices As shown in Figure 2 below:
Figure 2: Hard-switching boost circuit for SIC tubes
Because of the nature of SiC devices, the reverse recovery time of SiC diodes is close to zero, so switching losses are low. The benefits of using SiC in PFCs are: high frequency, low switching losses at higher switching frequencies, reduced inductor size, and increased power density.
In a six-pipe PFC with a three-phase VIENNA topology, a full 6-tube SiC MOSFET can be used to eliminate the fast recovery diode, as shown in Figure 3 below:
Figure 3: PFC circuit consisting of 6 SIC MOSFETs
The 6-tube PFC in the above figure, if you choose 6 900V 65 milliohm SiC MOSFET or 1200V 160 milliohm / 80 milliohm SiC MOSFET, the target switching frequency is 100Khz, the maximum can be 20KW power.
Figure 4: Waveforms for SIC MOSFET turn-on and turn-off
It can be seen from the simulation model in Fig. 4 that the crossover area between turn-on and turn-off is very small, so the loss is very small. The CREE SiC products of Shiqiang agent can realize high efficiency, low cost and small volume on the communication power supply. And high reliability requirements.
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