KR20040027220A - A device for protecting user terminal - Google Patents

Abstract

PURPOSE: A data terminal protector is provided to protect a data communication terminal from an over voltage in a convenient manner. CONSTITUTION: A data terminal protector comprises a lead-in connector(11) connected to a data communication network; a lead-out connector(10) connected to a communication terminal of a subscriber terminal; a printed circuit board(13) for arresting the over voltage applied from the lead-in connector, and electrically connecting the lead-in connector and the lead-out connector; and a plate(12) coupled to a case of a data communication terminal in such a manner that the plate is connected to the case of the data communication terminal through a common grounding.

Description

Data terminal protector {A device for protecting user terminal}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protector that protects the property and the life of a subscriber using data communication. In particular, a modem, a personal computer, etc. of a general subscriber using data communication using data communication media such as ADSL, cable modem, or LAN. The present invention relates to a protector that protects against abnormal overvoltages such as lightning strikes.

Recently, due to the widespread use of high-speed Internet, data terminals are being distributed almost every house, and data terminals mainly called personal computers are widely used.

On the other hand, natural phenomena such as lightning strikes may cause damage to telephones, computers, etc., and in severe cases, there is a great risk of human life.

However, in the prior art, it was completely defenseless against such a lightning strike.

Although there is a telephone line protector applied to the telephone to prevent such a risk, it is designed to fit the ring signal voltage of the telephone to 180V, which is not suitable for data terminals using a voltage as low as 5V. Do.

In addition, since a conventional telephone line protector has to secure a separate ground wire, it is not suitable to be installed and applied in a general home.

The technical problem to be solved by the present invention is to solve such a conventional problem, and to protect the data communication terminal from abnormal overvoltage such as lightning.

1 is a block diagram of a data terminal protector according to an embodiment of the present invention.

FIG. 2 is a detailed configuration diagram of the management server of FIG. 1.

3 is a block diagram of a data terminal protector connected to an internal modem according to an embodiment of the present invention.

4 is a block diagram of a data terminal protector connected to an external modem according to an embodiment of the present invention.

* Description of main parts of drawing *

10: Outlet connector 11: Inlet connector

12: Plate 13: PCB Board

300: overvoltage protection unit

Data terminal protector according to the characteristics of the present invention for solving the technical problem,

A protector that protects a terminal that receives data communication service by connecting to a carrier's data communication network.

An entry connector connected to the data communication network;

An outlet connector connected to the communication terminal of the subscriber station;

A PCB substrate which cuts off an overvoltage input from the inlet connector and electrically connects the inlet connector and the outlet connector;

And a plate coupled to the case of the terminal so as to be connected to the case of the data communication terminal in common ground.

Data terminal protector according to another aspect of the present invention for solving the technical problem,

A protector that protects a terminal that receives data communication service by connecting to a carrier's data communication network.

An entry connector connected to the data communication network;

An outlet connector connected to the communication terminal of the subscriber station;

The overvoltage input from the inlet connector is cut off, and the normal data signal input from the inlet connector includes an overvoltage protection unit for transmitting to the outlet connector.

Then, embodiments of the present invention will be described with reference to the accompanying drawings so that the present invention can be easily implemented by those skilled in the art.

1 is a perspective view of a data terminal protector according to an embodiment of the present invention.

Referring to FIG. 1, a data terminal protector according to an embodiment of the present invention includes an inlet connector 11 and an outlet connector 10, which can be mounted on a PCB substrate 13 and a subscriber computer case. It is composed of a plate 12 coupled to be connected to a common ground. Its external form is a PCI card, but there is no terminal part connected to the computer mainboard, and the appearance can be variously modified as necessary.

2 is a circuit diagram of a terminal protector for data communication according to an embodiment of the present invention.

2, a data terminal protector according to an embodiment of the present invention is a protector that protects a terminal connected to a data communication network of a communication service provider and receives a data communication service, and includes an inlet connector 11 and an outlet connector 10. ) And an overvoltage protection unit 300.

The inlet connector 11 is connected to a data communication network, and the outlet connector 10 is connected to a communication terminal of a subscriber computer. The overvoltage protection unit 300 cuts off the overvoltage input from the inlet connector 11, and transmits the normal data signal input from the inlet connector 11 to the outlet connector 10. The ground of FIG. 2 is connected to the plate 12 of FIG. 1, and the plate 12 is connected to a personal computer case so that the ground and the power supply of the computer, the power supply and the signal line of the modem are in the equipotential region.

The overvoltage protection unit 300, the signal transmission unit 30 for transmitting the signal of the lead-in connector 11 to the lead-out connector 10, when the over-voltage is detected in the lead-in connector 11, the A first voltage limiter 37 for controlling the overvoltage, a second voltage limiter 33 for controlling the overvoltage, and an output signal of the signal transfer unit when an overvoltage is detected at the inlet connector 11 Is a signal blocking unit 32 to block the transfer to the second voltage limiting unit 33 when the normal state.

Here, the overvoltage protection unit 300 is mounted on the PCB substrate 13 of FIG.

Then, the operation of the data terminal protector according to the embodiment of the present invention having such a configuration will be described in detail.

First, FIG. 3 illustrates a case where data communication is performed through an internal modem. The user installs the data terminal protector 21 (hereinafter referred to as 'protector') on the personal computer as shown in FIG. The data communication external line 22 is connected to the inlet connector 11, and the outlet connector 10 is connected to the internal modem 20 by a separate cable 23.

Meanwhile, FIG. 4 shows a case where data communication is performed by an external modem to a computer.

In FIG. 4, when the external modem 24 is installed, the protector 21 is installed in the personal computer, the data communication external line 22 is connected to the inlet connector 11, and the outlet connector 10 is connected. A separate cable 23 is connected to the external modem 24, and another cable 25 connects the external modem 24 and the LAN card of the computer.

This connection scheme can be modified for each data carrier.

In this way, the user is in a data communication with the computer is completed installation of the protector.

When data communication is normal, the data signal input through the inlet connector 11 is sent to the subscriber modem via the outlet connector 10 immediately after passing through the resistors R1 and R2. At this time, the data communication signal is a high frequency signal and does not pass through the inductors L1 and L2 so that there is no loss of the data signal. The inductors L1 and L2 prevent loss of data due to the high capacitance value of the second voltage limiter 33 made of diodes.

On the other hand, when an abnormal transient voltage flows into the inlet connector 11 through a data communication line due to a lightning strike, the resistors R1 and R2 connected in series delay the flow of the transient voltage for a predetermined time, The first voltage limiter 37 made of a raster operates to control the overvoltage by making the connected signal line equal in potential.

However, the first voltage limiting unit 37 is difficult to operate when the voltage limiting voltage is 80 V or less due to the characteristics of the arrester element, and the operation speed is slightly delayed to operate. Therefore, it is insufficient to control overvoltage completely.

Complementary to this is the second voltage limiting section 33 of the rear stage, it is composed of a diode, the operating speed is fast, it operates quickly even at a low voltage of 80V or less. Thus, the overvoltage controlled by the arrester element is dropped to a lower voltage in a safer range. This operation is as follows.

When the overvoltage is applied, the overvoltage is transmitted to the second voltage limiter 33 through the inductors L1 and L2. Since the overvoltage is a relative concept, it is caught by either the inductor L1 or the inductor L2.

First, when an overvoltage is applied to the inductor L1, the diode D2 is turned on because the overvoltage is equal to or higher than the breakdown voltage of the diode D2, and at the same time, the diode D5 is turned on because the diode D5 is forward. Accordingly, the remaining diodes D1, D3, D7, D4, and D6 are also turned on due to the forward or reverse breakdown voltage. Then, the signal line of the inductor L1 side, the signal line of the inductor L2 side and the ground line become equipotential, and the voltage is controlled. The formation of an equipotential surface through such a diode can cope with voltage imbalance for an extremely short time.

On the other hand, when an overvoltage is applied to the signal line of the inductor L2, the diode D1 is turned on because the overvoltage is equal to or higher than the breakdown voltage of the diode D1, and at the same time, the diode D4 is turned forward because the diode D4 is forward. Accordingly, the remaining diodes D2, D3, D7, D5, and D6 are also turned on due to the breakdown voltage in the forward or reverse direction. Then, the signal line of the inductor L1 side, the signal line of the inductor L2 side and the ground line become equipotential, and the voltage is controlled.

Here, only the diodes D1, D2, and D3 may be used, but the diodes D4, D5, D6, and D7 may be used to increase the reliability and increase the current capacity to control overvoltage more quickly. Such second voltage limiting portion 33 of the present invention can be variously modified as necessary.

As described above, in the embodiment of the present invention, the data communication terminal and the personal computer which are exposed in a defenseless state can be easily protected from overvoltage without additional construction, and further, to secure important information stored in the personal computer, It is possible to provide a data terminal protector with the advantage of saving lives in natural disasters such as lightning strikes.

In addition, since the embodiment of the present invention has a structure that can be mounted on a personal computer, it is possible to provide an efficient protection function without installing a separate enclosure or an individual ground wire. In addition, by applying the voltage limiting element to the primary and secondary, it is possible to more quickly and precisely control the voltage.

Claims (15)

A protector that protects a terminal that receives data communication service by connecting to a carrier's data communication network. An entry connector connected to the data communication network; An outlet connector connected to the communication terminal of the subscriber station; A PCB substrate which cuts off an overvoltage input from the inlet connector and electrically connects the inlet connector and the outlet connector; And a plate coupled to the case of the terminal so as to be connected to the case of the data communication terminal in common ground. The method of claim 1, And the plate is coupled to the case of the terminal like a PCI card. The method according to claim 1 or 2, An overvoltage blocking circuit for blocking an overvoltage is mounted on the PCB board, and the overvoltage blocking circuit includes: A signal transmission unit for transmitting a signal of the inlet connector to the outlet connector; A first voltage limiter configured to control the overvoltage to be lowered when an overvoltage is detected at the lead-in connector; A second voltage limiter configured to control the overvoltage to be lowered when an overvoltage is detected at the lead-in connector; And a signal blocking unit to block the second voltage limiting unit from being output when the output signal of the signal transmitting unit is in a normal state. The method of claim 3, The signal transmission unit, A first resistor connected in series to one end of the inlet connector; And a second resistor connected in series with the other end of the inlet connector. The method of claim 4, wherein The first voltage limiting unit The upper and lower terminals are connected to both ends of the lead-in connector, the middle terminal is grounded, the protector, characterized in that the arrester to make three terminals equipotential in the event of an overvoltage. The method of claim 5, The signal blocking unit, A first inductor connected in series with one end of the first resistor; And a second inductor coupled to one end of the second resistor. The method of claim 6, The second voltage limiting unit, First, second and third diodes connected in a reverse direction to the first inductor, the ground and the second inductor, and the other end of which is commonly connected; Fourth, fifth and sixth diodes connected in a forward direction to the first inductor, the ground and the second inductor, and the other end of which is commonly connected; And a seventh diode connecting the common connected contact of the first, second and third diodes with the common connected contact of the fourth, fifth and sixth diodes. A protector that protects a terminal that receives data communication service by connecting to a carrier's data communication network. An entry connector connected to the data communication network; An outlet connector connected to the communication terminal of the subscriber station; And an overvoltage protection unit for blocking an overvoltage input from the lead-in connector and transmitting a normal data signal input from the lead-in connector to the lead-out connector. The method of claim 8, The overvoltage prevention unit, A signal transmission unit for transmitting a signal of the inlet connector to the outlet connector; And a first voltage limiter configured to control the overvoltage to be lowered when an overvoltage is detected at the lead-in connector. The method of claim 9, The overvoltage prevention unit, A second voltage limiter configured to control the overvoltage to be lowered when an overvoltage is detected at the lead-in connector; And a signal blocking unit for blocking the signal transmission unit from being transmitted to the second voltage limiting unit when the output signal is in a normal state. The method of claim 10, The signal transmission unit, A first resistor connected in series to one end of the inlet connector; And a second resistor connected in series with the other end of the inlet connector. The method of claim 11, The first voltage limiting unit A protector, characterized in that the upper and lower terminals are connected to both ends of the inlet connector, and the middle terminal is grounded so that the three terminals are equipotential when overvoltage occurs. The method of claim 12, The signal blocking unit, A first inductor connected in series with one end of the first resistor; And a second inductor coupled to one end of the second resistor. The method of claim 13, The second voltage limiting unit, First, second and third diodes connected in a reverse direction to the first inductor, the ground and the second inductor, and the other end of which is commonly connected; Fourth, fifth and sixth diodes connected in a forward direction to the first inductor, the ground and the second inductor, and the other end of which is commonly connected; And a seventh diode connecting the common connected contact of the first, second and third diodes with the common connected contact of the fourth, fifth and sixth diodes. The method of claim 13, The second voltage limiting unit, The first inductor, the ground and the second inductor, the protector, characterized in that the other end is composed of the first, second, third diodes commonly connected.