CN200979987Y

CN200979987Y - A protective unit using an over-current and over-voltage protection TBU unit

Info

Publication number: CN200979987Y
Application number: CN 200620165057
Authority: CN
Inventors: 吴仲彬; 汤红军
Original assignee: Nanjing Putian Telecommunications Co Ltd
Current assignee: Nanjing Putian Telecommunications Co Ltd
Priority date: 2006-12-13
Filing date: 2006-12-13
Publication date: 2007-11-21
Anticipated expiration: 2016-12-13

Abstract

The utility model relates to a security unit using an excess current and an excess voltage protection element TBU, comprising two groups of excess current and excess voltage protection circuits and alarm circuits symmetrically equipped, wherein the two groups of excess current and excess voltage protection circuits comprises an excess current and excess voltage protection element, a gas-discharge tube, and a semi-conductor discharge tube, and the gas-discharge tube and the semi-conductor discharge tube are parallel connected with two ends of the excess current and excess voltage protection element, while a plurality of current-limiting resistances in the two groups of the excess current and excess voltage protection circuits are separately connected with two optical coupling input ends which are connected together and parallel connected with a control electrode of a silicon controlled SC, wherein the anode of the silicon controlled SC is connected with a diode. The utility model has the advantages of a full-electronic structure, combining excess current and excess voltage protection and alarm together, high reliability, timely protection, and can achieve effectively protecting a second protective system in an exchange and self-resetting the excess current and excess voltage protection completely, not only has a line current in a TBU protection-mode almost down to zero, but also can do not produce heat, prevent damages of devices and cables, and have good transmitting capacity.

Description

A kind of Security Unit that uses overcurrent, overvoltage protection elements T BU

Technical field

The utility model is a kind of outside line safeguard that is used for main frame (main distribution frame) a---Security Unit (protective unit); be inserted in the socket of safety wire connection row; can prevent the injury that the person in the telephone office and equipment suffer the overvoltage overcurrent, belong to the once protection equipment technical field of switch front end.

Background technology

The device that is used for overvoltage, overcurrent protection in the existing Security Unit is all discharge tube and thermistor (PTC), structural design wherein then has very big difference, though through constantly development for a long time, the barrier propterty of Security Unit is existing to improve, but still have weak point, and along with the continuous development of communicating by letter, protection, the transmission performance of above-mentioned traditional Security Unit have had new requirement, so present Security Unit faces following problem: the various and complicated structural member of number assembles loaded down with trivial details, has reduced the complete machine performance reliability; The overcurrent responsiveness is slow, and the PTC in the switch second protection is often fast than the PTC action response in the protector, makes the overcurrent protection of protector inoperative; The alarm output of Security Unit and abating protection device need cause in the Security Unit mechanical structure action just can finish by the accumulation of heat, and the time is longer, and heat is bigger during big electric current, and fail safe reduces; Abating protection device in the Security Unit is in case the action back is irrecoverable.

Summary of the invention

The purpose of this utility model is exactly in order to solve above-mentioned a series of problem; design a kind of Security Unit that uses overcurrent, overvoltage protection elements T BU; employing has the self-resetting type Security Unit of overcurrent, over-voltage protection function chip (this chip is that FULTEC semiconductor company model is the chip of C850-180 or the chip that the overcurrent-overvoltage safeguard function is equal to it)

Technical solution of the present utility model: the Security Unit of overvoltage protection elements T BU (Transient BlockingUnit), its structure is to comprise symmetrically arranged two groups of overcurrents, overvoltage protection circuit and warning circuit, wherein first group of overcurrent, overvoltage protection circuit are made up of first overcurrent, overvoltage protection element and first gas discharge tube and first semiconductor discharge tube, and described first gas discharge tube and first semiconductor discharge tube are attempted by two ends of first overcurrent, overvoltage protection element; Second group of overcurrent, overvoltage protection circuit are made up of second overcurrent, overvoltage protection element and second gas discharge tube and second semiconductor discharge tube, and described second gas discharge tube and second semiconductor discharge tube are attempted by two ends of second overcurrent, overvoltage protection element; First resistance, second resistance in two groups of overcurrents, the overvoltage protection circuit connect first optocoupler in the warning circuit, the input of second optocoupler respectively; First optocoupler in the warning circuit, the output of second optocoupler join, and connect the control utmost point of controllable silicon SC, the anode sending and receiving optical diode of controllable silicon SC by the 3rd resistance.

Advantage of the present utility model: Security Unit is that all electronic structure does not need any tradition to rely on the mechanical structure of heat action to realize protection and alarm, integrates overcurrent protection, overvoltage protection, alarms, and has reduced the installation of structural member, the reliability height; Only several microseconds of the overcurrent protection response time of Security Unit, fast more a lot of than PTC, realize protection immediately, the secondary protection system of effectively protecting switch inside to form by PTC and fuse; The complete runback of overcurrent protection and overvoltage protection, and TBU protected mode line current is almost nil, does not produce heat, prevents equipment and cable bad; Good transmission performance, frequency be its Insertion Loss 0.3～0.6dB under 10MHz, return loss 23～16dB, the transmission requirement of suitable XDSL (ADSL (Asymmetric Digital Subscriber Line)).

Description of drawings

Accompanying drawing 1 is an electrical schematic diagram of the present utility model.

D1 among the figure, D2 are first, second optocoupler (models: 4N25), D3, D4 are first, second overcurrent, overvoltage protection element, and Z1, Z3 are first, second gas discharge tubes, and Z2, Z4 are first, second semiconductor discharge tubes, R4 is first resistance, R2 is second resistance, and R3 is the 3rd resistance, and R1 is the 4th resistance, R5 is the 5th resistance, SC is that (model: MCR100-6), V1-V3 is that diode, V3 are light-emitting diodes to controllable silicon, and C1, C2 are electric capacity.A, b are outside lines, and a ', b ' are the interior lines after outside line a, b pass through first, second overcurrent, overvoltage protection element D3, D4.

Embodiment

The contrast accompanying drawing, the Security Unit of overvoltage protection elements T BU (Transient Blocking Unit), its structure is to comprise symmetrically arranged two groups of overcurrents, overvoltage protection circuit and warning circuit, wherein first group of overcurrent, overvoltage protection circuit are made up of first overcurrent, overvoltage protection element D3 and the first gas discharge tube Z1 and the first semiconductor discharge tube Z2, and the described first gas discharge tube Z1 and the first semiconductor discharge tube Z2 are attempted by two ends of first overcurrent, overvoltage protection element D3; Second group of overcurrent, overvoltage protection circuit are made up of second overcurrent, overvoltage protection element D4 and the second gas discharge tube Z3 and the second semiconductor discharge tube Z4, and the described second gas discharge tube Z3 and the second semiconductor discharge tube Z4 are attempted by two ends of second overcurrent, overvoltage protection element D4; First resistance R 4, second resistance R 2 in two groups of overcurrents, the overvoltage protection circuit connect the first optocoupler D1 in the warning circuit, the input of the second optocoupler D2 respectively; The first optocoupler D1 in the warning circuit, the output of the second optocoupler D2 join, and connect the control utmost point of controllable silicon SC, the anode sending and receiving optical diode V4 of controllable silicon SC by the 3rd resistance R 3.

Two groups of protection circuits respectively are made up of TBU and gas discharge tube, semiconductor discharge tube, and warning circuit comprises two optocouplers and controllable silicon, diode, resistance, electric capacity and light-emitting diode.When outside line a or b suffered overcurrent, overvoltage invasion, TBU moment became high-impedance state, stops harm electric current inflow rear end, thus protection equipment and personnel's safety; Simultaneously, after TBU became high resistant, the invasion electric current impelled optocoupler to drive the rear end warning circuit after first resistance (current limliting) R4 or second resistance (current limliting) R2 shunting, causes light-emitting diode V3 luminous, the outputting alarm signal; When outside line a or b suffered the thunderbolt invasion, the gas discharge tube snap action imported ground wire with thunder-strike current, the safety of protection rear end equipment.

Claims

1, a kind of Security Unit that uses overcurrent, overvoltage protection elements T BU, it is characterized in that comprising symmetrically arranged two groups of overcurrents, overvoltage protection circuit and warning circuit, wherein first group of overcurrent, overvoltage protection circuit are made up of first overcurrent, overvoltage protection element and first gas discharge tube and first semiconductor discharge tube, and described first gas discharge tube and first semiconductor discharge tube are attempted by two ends of first overcurrent, overvoltage protection element; Second group of overcurrent, overvoltage protection circuit are made up of second overcurrent, overvoltage protection element and second gas discharge tube and second semiconductor discharge tube, and described second gas discharge tube and second semiconductor discharge tube are attempted by two ends of second overcurrent, overvoltage protection element; First resistance, second resistance in two groups of overcurrents, the overvoltage protection circuit connect first optocoupler in the warning circuit, the input of second optocoupler respectively; First optocoupler in the warning circuit, the output of second optocoupler join, and connect the control utmost point of controllable silicon SC, the anode sending and receiving optical diode of controllable silicon SC by the 3rd resistance.