Protective device of direct current power supple for communication equipment
A technology of DC power supply and communication equipment, which is applied in the direction of emergency protection circuit device, circuit device, emergency protection circuit device, etc. for limiting overcurrent/overvoltage, and can solve the problem of poor lightning protection ability and poor resistance to various electromagnetic interferences and other problems, to achieve the effects of low lightning strike current, solve high and low frequency interference, and prevent input voltage jumps
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[0014] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0015] Such as figure 1 , figure 2 As shown, the DC power supply for communication equipment has three output terminals of 0V, -48V and PE (grounding wire). This protective device is connected to the output terminal of the DC power supply for comprehensive protection of the DC power supply. The protective device Including lightning strike protection module, overvoltage and undervoltage protection module, filtering module and DC / DC module.
[0016] The lightning strike protection module includes a primary protection unit, a display unit, a secondary protection unit and a fuse FU2. The primary unit is used to discharge current and discharge large-capacity lightning strike current. The first, second and third three piezoresistors MOV 1 , MOV 2 , MOV 3 constituted where the first varistor MOV 1 After being connected in series with the fuse FU2, it is connected to t...
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