KR101013244B1 - Surge voltage preventing system non-grounding pedigree - Google Patents

Abstract

The present invention is installed in parallel in the non-grounding method on the inlet terminals (IN A, IN B) of the input line of the power supply unit of the electronic system, and the surge voltage flowing into the inlet terminals (IN A, IN B) side of the input line is primarily used. A first MOV which is a metal oxide varistor for emitting; An inductor connected to both ends of the first MOV in an ungrounded manner to pass normal signals flowing along the input line and block only a surge voltage; A non-grounding parallel arrangement on the inlets (IN C, IN D) of the signal and communication input lines to discharge the surge voltage flowing into the inlets (IN C, IN D) of the input lines primarily; Provides an ungrounded surge protection system that includes 2 GDTs.

The present invention as described above can completely protect the electronic equipment by completely removing the surge flowing in the ungrounded state, as well as to protect the power system and the signal and communication system at the same time to protect the electronic equipment surge protection Costs can be minimized and integrated management maximizes efficient operation by installing one surge protector in one electronic device.

       Surge voltage, reverse direction, transmission characteristic, transmission equipment, noise, bridge

Description

Surge voltage preventing system non-grounding pedigree

The present invention relates to a surge prevention system of an ungrounded system, and in particular, even when a surge voltage flows into both input lines of a power input terminal or a signal input terminal composed of an ungrounded system, the surge voltage is transmitted through adjacent discharge and blocking elements. The present invention relates to a surge protection system of an ungrounded system that safely discharges in multiple stages.

In general, surge voltages are generally classified into open / close surge, accident surge, and lightning surge. Among these surge voltages, open / close surge is a surge generated when opening / closing a breaker of a high voltage device installed on a transmission line. It refers to surge caused by overvoltage generated when ground is grounded by physical force, and thunder surge voltage (lightning or lightning) refers to the lightning voltage when the thunderstorm charged in the thunderstorm in the upper part of the atmosphere is discharged to the ground. A surge surge is a type of surge surge that enters a communications or electrical device and damages the device.

However, in order to prevent damage to the device from the surge voltage (surge voltage) as described above, electronic or communication systems usually use surge voltage protection devices connected to the inlet or transmission line of the device. Voltage protection devices are mainly applied to various signals, communications, data, video transmission lines, or communication parts of communication devices such as telephones, fax machines, modems, or electric shocks due to surge voltages such as lightning surges and static electricity, such as CRT driving circuits. It is installed in the part which is easy to receive and it prevents the communication or electronic device from being damaged by abnormal voltage by consuming surge energy by gas discharge and discharge when surge voltage is inflowed.

Then, referring to FIG. 1, one example of the conventional surge voltage preventing device as described above is provided on an input line 70, for example, on input terminals IN A and IN B of various signals, communications, data, and image transmission lines. Installed in parallel and flowing to the inlet (IN A, IN B) side of this line

A first GDT (gas discharge tube) 71 for discharging the surge voltage primarily;

Resistors 72A and 72B connected in series on the input line 70 to pass normal signals flowing along the input line 70 and block only the surge voltage;

An arrester 74A connected in parallel between the input line 70 and the input terminal of the electronic or communication system 73 to discharge the surge voltage input via the input line 70 in a second manner through the ground terminal GND; 74B).

On the other hand, referring to the operation of the conventional surge voltage prevention device as described above, when a normal state in which lightning or other high voltage or overvoltage does not flow into the input line 70, an input signal normally input from the outside, for example, an image signal or a communication signal Alternatively, since the data signal is transmitted to the electronic or communication system 73 via the input line 70, the electronic or communication system 73 operates normally. Here, the first GDT 71 or the arresters 74A and 74B connected on the input line 70 do not operate.

     However, if a lightning strike or high voltage is generated around the input line 70 to flow into the electronic or communication system 73 along the input line 70, the surge voltage is resistors 72A and 72B. Are blocked by the two holes and flow to the first GDT 71 side. At this time, the first GDT 71 is operated by a surge voltage of more than a threshold voltage flowing into the input terminals IN A and IN B of the input line 70 so that the corresponding surge voltage is primarily input and ground terminals GND. Release through. Here, when the surge voltage passes through the resistors 71A and 71B for several reasons, for example, primary discharged surge residual voltage, the surge voltage is between the input line 70 and the input terminal of the electronic or communication system 73. By discharging through the ground terminal GND secondly by the lightning arresters 74A and 74B connected in parallel, the surge voltage is prevented from entering the electronic or communication system 73 to prevent damage to the electronic or communication system 73. Protect.

      However, the conventional surge voltage suppressor as described above, when the ground terminal GND is not grounded, a surge voltage such as a lightning strike or an overvoltage introduced into the lead end of the surge voltage suppressor through the ground terminal GND. Because of the failure to discharge, expensive surges of electronic or communication systems are frequently caused by such surge voltages.

In addition, in order to protect one electronic device, the power protection surge protector and each signal and communication surge protector must be installed at the same time to protect the electronic device or communication system, thereby increasing the system protection cost and making it difficult to integrate management. there was.

Accordingly, the present invention has been invented to solve the problems of the prior art as described above, by constructing a gas discharge tube, an arrester and a blocking means in a multi-stage in a circuit stage in which the power input terminal and the signal input terminal are commonly connected to the ungrounded system, It provides a non-grounding surge protection system that safely discharges the surge voltage in multiple stages through adjacent discharge and blocking elements even when surge voltage flows into both input lines of the power input terminal or signal input terminal composed of the ground system. There is a purpose.

It is still another object of the present invention to integrally protect each input line (power, signal, communication) by disposing the discharge and blocking elements in multiple stages in a circuit stage where the power input terminal and the signal input terminal are commonly connected to the ungrounded system. To provide a non-grounded surge protection system.

The present invention for achieving the above object is installed in parallel of the non-grounding method on the inlet (IN A, IN B) of the input line of the power supply unit of the electronic system, the inlet of the input line (IN A, IN B) A first MOV, which is a metal oxide varistor that primarily discharges a surge voltage flowing into the side;

An inductor connected to both input lines of the first MOV in an ungrounded manner to supply power flowing along the input line as it is and to block only a surge voltage;

A surge voltage is provided between the one input line of the first MOV and the one input line of the signal or communication input line in a non-grounding manner and flows into the input terminal (IN C, IN D) side of the power supply input line or the signal or communication input line. A first GDT for discharging secondly;

A non-grounding parallel arrangement on the inlets (IN C, IN D) of the signal and communication input lines to discharge the surge voltage flowing into the inlets (IN C, IN D) of the input lines primarily; 2 GDT;

It is connected to both ends of the signal and communication input line in series to provide a surge protection system of an ungrounded system comprising a primary resistor for passing the normal signals flowing along the input line as it is and blocking only the surge voltage.

As described above, the present invention eliminates the surge voltage accidentally introduced into both input lines of the power input terminal or the signal input terminal composed of the non-grounded system in multiple stages, thereby reliably protecting the electronic equipment from the surge voltage. Have.

In addition, according to the present invention, it is possible to improve the transmission characteristics of signals and communication lines and to protect each input line (power, signal, and communication) integrally, thereby reducing management costs and efficiently managing a surge prevention system. It has the effect of doing it.

Furthermore, the present invention improves the surge protection method of ungrounded equipment and can be installed in existing poor grounding and ungrounded (UPS, secondary insulation transformer, old buildings without grounding facilities, artificial grounding for system stability). It is also possible to maximize the surge protection of electronic equipment as a non-grounding integrated surge protector that greatly improves the problems that could not be prevented even during installation.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2, the apparatus of the present invention is a non-grounding method (two lines) on an input line 2 of a power supply unit of an electronic system 1, for example, an input terminal IN A or IN B of various power sources such as a modem or a PLC. First MOV 3, which is a metal oxide varistor which is installed in parallel with each other and is not connected to the ground terminal and discharges a surge voltage flowing into the input terminals IN A and IN B side of the input line 2 firstly;

An inductor (4) connected to an input line (2) at both ends of the first MOV (3) in a non-grounding manner to supply power flowing along the input line (2) as it is and to block only a surge voltage;

 A second MOV (5) connected non-grounded on the input line (2) at both ends of the inductor (4) to discharge the surge voltage introduced through the inductor (4) through the power line;

The non-grounding method is provided between the one input line 2 of the first MOV 3 and the one input line of the signal or communication input line 6 so that the power supply input line 2 or the signal or communication input line 6 A first GDT (gas discharge tube) 7 for discharging the surge voltage flowing into the inflow terminals IN C and IN D secondary;

The signal and communication input lines 6, for example, modems and PLCs, are installed in parallel in a non-grounding manner on the input terminals IN C and IN D of various communication units and communication units. A second GDT (8) for discharging the surge voltage flowing into IN C, IN D) firstly;

A primary resistor (9A-9B) connected in series to both ends of the signal and communication input line (6) to pass normal signals flowing along the input line (6) as they are and to block only the surge voltage;

 Both ends of the second GDT 8 are connected via primary resistors 9A and 9B, respectively, and the surge voltages introduced through the primary resistors 9A and 9B are secondarily communicated and emitted through a signal line. A third MOV 10;

Secondary resistors connected to both ends of the third MOV 10 in series and passing normal signals flowing along the input line 6 through primary resistors 9A and 9B as they are and blocking only the surge voltage ( 11A, 11B);

Before the flow of the surge voltage introduced through the signal and communication input line 6, the primary resistors 9A and 9B and the secondary resistors 10A and 10B into the electronic system 1, communication and signal lines Noise canceling unit 12 for emitting through;

Is connected between one side of the second MOV 5 and one side of the third MOV 10 and flows into the inductor 4, the second MOV 5 side, or the primary resistor 9A or the third MOV 10. It includes a fourth MOV (13) for communicating the residual surge voltage to be discharged through the signal line.

Here, the noise removing unit 12 may use a noise removing filter or a bridge circuit to improve transmission characteristics.

In addition, the first GDT 7 and the second GDT 8 are two-pole lightning arresters, and at least 800 V and 50/60 Hz of commercial frequency AC voltages are controlled based on a standard brain impulse voltage (1.2 / 50 μs). Protection devices which start in discharge at a minimum of 130 V in the circuit or in adjacent ground faults can be used.

Next, the operation and effects of the present invention having the above configuration will be described.

The apparatus of the present invention, first, when a surge voltage, for example, lightning or other high voltage or overvoltage does not flow through the power supply input line (2) in a normal state, the power source normally input through the input line (2) from the outside, such as AC or DC power Supply to the electronic system (1).

Here, the first MOV (3), the second MOV (5) connected on the input line (2, 6) in the normal state that the surge voltage does not flow into the non-grounded power supply input line (2) as described above , The first GDT 7 and the second GDT 8 do not operate

However, if an unexpected surge voltage, such as a lightning or high voltage, is generated around the power supply input line 2 during the normal operation as described above, and tries to flow into the electronic system 1 along these input lines 2 and 6. For example, when trying to input to the power supply input line 2, first, the surge voltage is blocked by the inductor 4 to flow to the first MOV (3) side. In addition, the first MOV 3 is operated by a surge voltage higher than a reference voltage flowing into the input line 2 side to discharge the surge voltage to the inlets INA and INB of the power supply input line 2 primarily. Let's do it.

When the surge residual voltage also flows to the first GDT 7, the first GDT 7 is controlled by a commercial frequency AC voltage of at least 800 V and 50/60 Hz based on a standard brain impulse voltage (1.2 / 50 μs). Since the device starts to discharge at least 130 V when mixed in the circuit or near ground fault, it is operated by surge voltage higher than the reference voltage flowing into the input terminal (IN B, IN C) of each input line (2, 6). Surge voltage is first emitted through power, signal and communication lines.

However, when a part of the surge voltage discharged primarily due to the surge voltage passes through the inductor 4, the surge residual voltage is blocked by the inductor 4 and then the input line 2 and the electronic system ( It flows to the 2nd MOV (5) connected in parallel between the input stage of 1), and discharges it again to the input stage (IN A, IN B) side.

In addition, if the surge residual voltage passes through the second MOV 5 during the process, the surge residual voltage is emitted by the fourth MOV 13 to the power input unit and the input terminal for signal and communication.

At this time, since the resistors 11A and 11B connected to the rear end side of the fourth MOV 13 are connected in series on the input line 6, the overvoltage is blocked from being passed to the rear end of the line so that the fourth MOV 13 Maximizes the operation and prevents the bridge diodes of the noise canceling unit 12 from shorting.

Therefore, the surge voltage is prevented from flowing into the electronic system 1 through the above process to protect the electronic system 1 from damage.

On the other hand, in a normal state in which lightning or other high voltage / overvoltage does not flow through the signal and communication input line 6, for example, an image signal, a communication signal, or a data signal normally input from the outside through the input line 6. Normal signals, such as, for example, are transmitted to an input terminal of an electronic system 1 such as a communication modem or a PLC, so that the electronic system 1 processes the corresponding input signal in a predetermined manner.

In this case, when the surge voltage does not flow as described above, the first GDT 7, the third MOV 10, etc. connected to the input line 6 do not operate.

At this time, in the normal state as described above, the input signal is passed through the noise removing unit 12 before being transmitted to the input terminal of the electronic system 1, and the noise removing unit 12 is, for example, a noise removing filter or a bridge. The circuit filters the noise components included in the input signal to improve the transmission characteristics and transmits the noise components to the input terminal of the electronic system 1.

However, if an unexpected surge voltage, for example, a lightning strike or a high voltage, is generated around the signal and communication input line 6 during the normal operation as described above, it is intended to flow into the electronic system 1 side along the input line 6. First, the surge voltage is blocked by the first resistors 9A and 9B and flows to the second GDT 8 side.

At this time, the second GDT 8 starts discharging at a minimum of 130 V when a commercial frequency AC voltage of at least 800 V and 50/60 hz is mixed in a control circuit based on a standard brain impulse voltage (1.2 / 50 μs). Since the device is operated by a surge voltage higher than the reference voltage flowing into the input terminals IN C and IN D of the input line 6, the surge voltage is primarily emitted through the signal and the communication line.

Here, when the surge voltage passes through the resistors 9A and 9B due to various reasons, for example, the primary residual surge residual voltage, the surge residual voltage passing through the primary resistors 9A and 9B is the secondary resistor. Blocked by (11A, 11B) and then flows to a third MOV (10) connected in parallel between the input line (6) and the input of the electronic system (1), the surge residual voltage of the third MOV (10) Since the minimum dielectric breakdown voltage is, for example, 100 V or more than the reference voltage, the third MOV 10 emits the signal through the communication line.

At this time, since the secondary resistors 11A and 11B connected to the rear end side of the third MOV 10 are connected in series on the input line 6, blocking the overvoltage from passing to the rear end of the line leads to the third MOV. In addition to maximizing the operation, the bridge diodes of the noise canceling unit 12 may be prevented from shorting.

However, if there is a surge residual voltage that has not been removed through the above process, the remaining surge voltage will be higher than the operating voltage of the bridge diode of the noise canceling unit 12, and the surge voltage is transmitted to the signal and communication line through the bridge diode. This prevents the surge voltage from flowing into the electronic system 1 and thus protects the breakage of the electronic system 1.

Here, if the transient voltage of the coin flows simultaneously into the input terminal IN A and the input terminal IN B of the power input line 2 composed of the non-grounding system in parallel to the power input line 2 in parallel. The connected first and second MOVs 3 and 5 may become inoperative, and at the same time, transient voltages on the coin are simultaneously applied to the input terminal IN C and the input terminal IN D of the input line 6 for signal and communication. Even when this flows in, the second GDT 8, the third MOV 10, and the noise canceling unit 12, which are connected in parallel to the signal and communication input lines 6, do not operate, and thus the input lines 2 and 6 do not operate. The connected electronic equipment may be damaged.

Therefore, when the transient voltage on the coin flows into the power input line 2, the input terminal IN B of the power supply input line 2 and the input terminal IN C of the signal and communication input line 6 are introduced. Since the first GDTs 7 are provided in parallel, the surge voltage flowing into the inlets IN A and IN B of the input line 2 is discharged primarily. In addition, the inductor 4 connected in series with the input terminal IN B blocks the surge residual voltage passing through the first MOV 3 due to various causes. In addition, if the surge residual voltage passes through the inductor 4 during the process, the second MOV 5 flows back into the input terminals IN A and IN B and receives the residual surge voltage through the inductor 4. Let it out.

Similarly, the surge voltage flowing into the input terminals IN C and IN D of the input line 6 is also discharged by the second GDT 8. In the process, if the surge voltage passes through the second GDT 8, the surge residual voltage is formed by the primary resistor 9A connected in series with the input terminal IN C at the rear end of the second GDT 8. Is blocked.

Furthermore, if the surge voltage flowing into the input terminals IN C and IN D passes through the primary resistor 9A by various causes, the passed MODU 13 may convert the surge residual voltage to both input terminals ( By discharge through 2, 6, it is possible to suppress the equipotential transient voltage flowing into the input line (2) or the input line (6).

      As described above, the present invention can reliably protect the electronic equipment from the surge voltage by removing the surge voltage in which the surge accidentally flows into the non-grounded system or the grounded electronic equipment, as well as along the line. Since the noise component included in the flowing communication signal can be effectively removed, it can be very useful when installed in all electronic and communication systems where surge voltage is concerned.

1 is an explanatory diagram illustrating an example of a conventional surge voltage preventing device.

2 is an explanatory diagram illustrating a surge prevention system of an ungrounded system of the present invention.

<Detailed Description of Codes>

1: Electronic system 2: Power input line

3: first MOV 4: inductor

5: second MOV 6: input line for signal or communication

7: first GDT 8: second GDT

9A-B: Primary Resistor 10: Third MOV

11A-B: Secondary Resistor 12: Noise Canceling Section

13: 4th MOV

Claims (7)

It is installed in parallel of the non-grounding method on the inlets (IN A, IN B) of the power supply input line (2) of the electronic system (1) and flows into the inlets (IN A, IN B) side of the input line (2). A first MOV (3) which is a metal oxide varistor which primarily emits a surge voltage to be discharged; An inductor (4) connected to an input line at both ends of the first MOV (3) in a non-grounding manner to supply power flowing along the input line (2) as it is and to block only a surge voltage; A second MOV (5) connected non-grounded on the input lines at both ends of the inductor (4) to discharge the surge voltage introduced via the inductor (4) through the power input line (2); It is installed in a non-grounding manner between one input line of the first MOV (3) and one input line of the signal or communication input line (6), the leading end of the power supply input line (2) or the signal or communication input line (6) A first GDT 7 for discharging the surge voltage flowing into the (IN C, IN D) side secondly; The surge voltage is provided in parallel with the non-grounding method on the input terminals IN C and IN D of the signal or communication input line 6 and flows into the input terminals IN C and IN D of the input line 6. A second GDT (8) for discharging primarily; Primary resistors 9A and 9B connected in series to both ends of the signal or communication input line 6 so as to pass normal signals flowing along the input line 6 and block only the surge voltage; Both ends of the second GDT 8 are connected via primary resistors 9A and 9B, respectively, to connect the surge voltages introduced through the primary resistors 9A and 9B to signal or communication input lines 6. And a third MOV (10) emitting through the non-grounded surge prevention system, characterized in that comprises a. delete delete       2. The secondary resistors 11A and 11B are connected in series to both ends of the third MOV 10, respectively, and flow along the input line 6 through the primary resistors 9A and 9B. Non-grounding surge prevention system, characterized in that the normal signals pass as it is and only the surge voltage is blocked.       The surge suppression system of claim 1, wherein a noise removing unit (12) configured as a bridge circuit end is connected to both ends of the third MOV (10).      The inductor (4) or the second MOV (5) side or primary is connected between one side of the second MOV (5) and one side of the third MOV (10). The surge suppression system of the ungrounded system, characterized in that the residual surge voltage flowing into the resistor (9A, 9B) or the third MOV (10) is discharged through the power supply input line (2) or signal or communication input line (6). . delete

Images