Braided mesh tube is used in computer power lines, audio and video cables, wire and cable industries, etc., to play a protective role. In almost all electronic circuits, the use of semiconductor wire mesh tube, many of the circuit plays an important role in the birth of one of the earliest semiconductor devices, its application is also very wide.

  The working principle of the wire mesh tube, crystal wire mesh tube for a p-n junction formed by p-type semiconductor and n-type semiconductor, the interface at both sides of the formation of space charge layer, and build a self-built electric field. When there is no applied voltage, the diffusion current caused by the difference in carrier concentration between the two sides of the p-n junction and the drift current caused by the self-built electric field are equal and in electrical equilibrium. When there is an external forward voltage bias, the mutual suppression of the external electric field and the self-built electric field increases the carrier diffusion current and causes the forward current. When there is a reverse voltage bias outside, the external electric field and self-built electric field to further strengthen the formation of reverse saturation current I0 in a certain reverse voltage range independent of the value of the reverse bias voltage when the applied reverse voltage is high to a certain level, the electric field strength in the p-n junction space charge layer reaches a critical value of the carrier multiplication process, a large number of electron-hole pairs, a large value of reverse breakdown current, known as the breakdown of the wire mesh. This is called the breakdown phenomenon of the wire mesh.

  Electronic circuit in the wire mesh tube positive terminal connected to the low potential end, the negative terminal connected to the high potential end, when the wire mesh tube in almost no current flow, the wire mesh tube in the cutoff state, this connection, known as reverse bias. Wire mesh in reverse bias, there will still be a weak reverse current flow through the wire mesh, called leakage current. When the reverse voltage at both ends of the wire mesh increases to a certain value, the reverse current will increase sharply, the wire mesh will lose unidirectional conductive properties, this state is called the wire mesh breakdown.

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