CN113131435A

CN113131435A - Security device and method

Info

Publication number: CN113131435A
Application number: CN201911425310.7A
Authority: CN
Inventors: 唐荣道
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2021-07-16

Abstract

The invention provides a security device and a method, wherein the security device comprises: an outside line port configured to be connected to an outside line loop; an internal line port configured to connect to an internal line loop; a control unit including a gas discharge tube; the protection unit comprises an over-current and over-temperature protection device, the over-current and over-temperature protection device is arranged between the outer wire port and the inner wire port, and the over-current and over-temperature protection device is connected with the gas discharge tube through thermal coupling; the protection unit is configured to control the connection between the external line port and the internal line port according to the abnormal current and/or the control heat through the overcurrent over-temperature protection device; the abnormal current is the current caused by the abnormal voltage of the external circuit, and the heat quantity is controlled to be the heat quantity which is generated when the gas discharge tube is broken down by the abnormal voltage and is transferred to the outside in a thermal coupling mode. The invention can solve the problem that the installation device in the related technology can not realize effective safety protection, thereby achieving the effect of effectively protecting the inner wire loop.

Description

Security device and method

Technical Field

The invention relates to the field of communication, in particular to a security device and a security method.

Background

The safety device of the distribution frame plays a role in protecting the communication line from overvoltage and overcurrent and also plays a role in alarming when the voltage is abnormal. Fig. 1 is a schematic circuit diagram of a security device according to the related art, and a circuit configuration of the security device in the related art is shown in fig. 1, specifically, a and b are external line terminals of the security device, a 'and b' are internal line terminals of the security device, S is a warning signal terminal of the security device, and GND is a ground terminal of the security device. Overcurrent protection elements R1 and R2 are Positive Temperature Coefficient thermistor (PTCR), overvoltage protection elements GDT1 and GDT2 are Gas Discharge tubes (Gas Discharge Tube), and K1 and K2 are normally closed external main circuit switches, and are generally formed by overlapping elastic metal sheets and fixed metal sheets. K3 is the alarm switch that normally opens, with K1 and K2 linkage.

In the related art, when overvoltage occurs, the switch is switched to a protective ground, and the light emitting diode H can be lighted and an alarm signal can be output under the condition that a current-limiting power supply is externally applied to the S pin and the GND. When external abnormal voltage causes the voltage at two ends of the electrode of the gas discharge tube to exceed the breakdown voltage of gas, gap discharge is caused, the gas discharge tube is rapidly changed from a high-resistance state to a low-resistance state to form conduction, other circuits connected in parallel with the gas discharge tube are protected, if the overvoltage lasts for a long time, the gas discharge tube generates heat and heats up due to long-time or frequent overcurrent, heat is transferred to low-temperature alloy through a heat transfer sheet, when a certain temperature is reached, the low-temperature alloy is fused to open a spring, so that an elastic metal sheet and a fixed metal sheet are separated, and disconnection of an external line main loop is realized.

In the protection process of the safety device in the related art, the safety device is based on the fact that low-temperature alloy is fused due to heating and temperature rise of the gas discharge tube, and only over-temperature protection can be achieved, and instant rapid protection capability under the condition of overcurrent is lacked. Moreover, under the condition of mass production of the safety device in the related art, due to the consistency difference of production process, devices, assembly and the like, the requirements on heating of the gas discharge tube and the matching of the main circuit of the external line disconnection are often difficult to meet, for example, when instantaneous high voltage and large current occur, the elastic metal sheet and the fixed metal sheet are mutually fused together due to the contact resistance, so that the GDT is subjected to overvoltage breakdown, the heating is generated, the heat is transferred to the low-temperature alloy, and a certain time is required for the spring to be opened. In addition, the structure of the safety device in the related art described above adopts a full mechanical mechanism, fig. 2 is a schematic structural diagram of the safety device provided according to the related art, and as shown in fig. 2, the safety device in the related art is required to be composed of a plurality of components such as a light emitting diode 001, a metal alarm sheet 002, a thermistor 003, a metal sheet 004, an alloy block 005, a movable block 006, a spring 007, a guide groove 008, a heat transfer sheet 009, a gas discharge tube 010, a ground wire end 011, and the like, so that the structure of the safety device in the related art is relatively complicated, the manual assembly workload is large in the actual production process, and the cost of the device is relatively high.

In view of the above-mentioned problem that the security device cannot achieve effective security protection in the related art, no effective solution has been proposed in the related art.

Disclosure of Invention

The embodiment of the invention provides a security device and a method, which at least solve the problem that effective security protection cannot be realized by the installation device in the related technology.

According to an embodiment of the present invention, there is provided a security device including:

an outside line port configured to be connected to an outside line loop;

an internal line port configured to connect to an internal line loop;

a control unit including a gas discharge tube;

the protection unit comprises an overcurrent and overtemperature protection device, wherein the overcurrent and overtemperature protection device is arranged between the external line port and the internal line port, and the overcurrent and overtemperature protection device is connected with the gas discharge tube through thermal coupling; the protection unit is configured to control the connection between the external line port and the internal line port according to abnormal current and/or control heat through the overcurrent over-temperature protection device;

the abnormal current is a current caused by abnormal voltage of the outer line loop, and the control heat is heat generated when the gas discharge tube is broken down by the abnormal voltage and transferred to the outside in a thermal coupling mode.

According to another embodiment of the present invention, there is also provided a security method applied to the security device in the above embodiment, the security method including:

acquiring abnormal current and controlling heat quantity;

controlling the connection between the external line port and the internal line port by an overcurrent over-temperature protection device according to the abnormal current and/or the control heat;

the abnormal current is current caused by abnormal voltage of an outer line loop, and the control heat is heat which is generated when the gas discharge tube is broken down by the abnormal voltage and is transferred to the outside in a thermal coupling mode; the over-current over-temperature protection device is connected with the gas discharge tube through thermal coupling.

a control unit including a gas discharge tube;

a failure alarm indication unit comprising:

an indicating subunit;

a switch subunit, which is configured to be thermally coupled with the gas discharge tube to open/close according to the control heat; the control heat is the heat which is generated when the gas discharge tube is broken down by abnormal voltage and is transferred to the outside in a thermal coupling mode; the abnormal voltage is the voltage of the external circuit under the abnormal condition;

and the power supply subunit is configured to supply power to the indicating subunit through the switch subunit so that the indicating subunit performs failure alarm indication.

the power supply subunit is controlled to supply power to the indicating subunit through the switch subunit, so that the indicating subunit performs failure alarm indication;

wherein the switch subunit is connected to the gas discharge tube by thermal coupling to be opened/closed according to the control heat; the control heat is the heat which is generated when the gas discharge tube is broken down by abnormal voltage and is transferred to the outside in a thermal coupling mode; the abnormal voltage is the voltage of the external circuit under the abnormal condition.

According to the invention, the protection unit in the protection installation can control the connection between the external wire port and the internal wire port according to abnormal current and/or control heat through the overcurrent and overtemperature protection device arranged between the external wire port and the internal wire port; the abnormal current is the voltage of the external circuit, and the control heat is the heat which is generated when the gas discharge tube in the control unit breaks down due to the abnormal voltage and is transferred to the outside in a thermal coupling mode. Therefore, the invention can solve the problem that the installation device in the related technology can not realize effective safety protection, thereby achieving the effect of effectively protecting the inner wire loop.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a schematic circuit diagram of a security device provided according to the related art;

fig. 2 is a schematic view of a construction of a security device provided according to the related art;

fig. 3 is a schematic diagram of a security device provided in accordance with an embodiment of the present invention;

FIG. 4 is a schematic diagram of a gas discharge tube provided in accordance with an embodiment of the present invention in connection with an over-current over-temperature protection device;

FIG. 5 is a functional diagram of a failure alarm indication unit provided according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of the switch subunit being turned on according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a switch subunit closure provided in accordance with an embodiment of the present invention;

fig. 8 is a top view of a switch subunit according to an embodiment of the present invention;

fig. 9 is a structural side view of a switch subunit provided in accordance with an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a switch subunit provided in accordance with an embodiment of the present invention;

fig. 11 is a flow chart (one) of a security method provided according to an embodiment of the present invention;

fig. 12 is a flowchart (two) of a security method according to an embodiment of the present invention.

Detailed Description

The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

Example 1

This embodiment provides a security device, fig. 3 is a schematic diagram of a security device provided according to an embodiment of the present invention, and as shown in fig. 3, the security device in this embodiment includes:

an outside line port 102 configured to connect to an outside line loop;

an internal wire port 104 configured to connect to an internal wire loop;

a control unit 106 including a gas discharge tube 1062;

the protection unit 108 comprises an overcurrent and overtemperature protection device 1082, wherein the overcurrent and overtemperature protection device 1082 is arranged between the external line port 102 and the internal line port 104, and the overcurrent and overtemperature protection device 1082 is connected with the gas discharge tube 1062 through thermal coupling; the protection unit 108 is configured to control the connection between the external line port 102 and the internal line port 104 according to the abnormal current and/or the control heat through the overcurrent excess temperature protection device 1082;

the abnormal current is the current caused by the abnormal voltage of the external circuit, and the control heat is the heat generated when the gas discharge tube is broken down by the abnormal voltage and transferred to the outside in a thermal coupling mode.

It should be further noted that the external line loop is an outdoor subscriber line, and the internal line loop is an office equipment line. The safety device in the embodiment is used for protecting the inner wire loop when the outer wire loop has abnormal voltage.

It should be further noted that, in the control unit of this embodiment, two independent two-electrode discharge tubes may be adopted to be respectively disposed between the positive electrode and the negative electrode of the outer line loop and the inner line loop, or a three-electrode gas discharge tube may also be adopted, which is not limited in this respect; in the protection unit of this embodiment, two over-current over-temperature protection devices are included to be respectively disposed between the positive and negative electrodes of the outer line loop and the inner line loop, and the gas discharge tube needs to thermally couple heat to the two over-current over-temperature protection devices at the same time.

It should be further described that, in the working process of the safety device in this embodiment, under the condition that the voltage of the external circuit is normal, the over-temperature and over-voltage protection device is in a short-circuit state. When the external circuit has abnormal voltage, on one hand, the over-current over-temperature protection device in the protection unit can rapidly disconnect the circuit between the external circuit port and the internal circuit port under the action of abnormal current caused by the abnormal voltage, so as to prevent the internal circuit from being influenced by the abnormality of the external circuit. On the other hand, when the abnormal voltage exists in the external circuit of the gas discharge tube in the control unit, and the voltage at two ends of the electrode of the gas discharge tube exceeds the breakdown voltage of the gas, the gap discharge of the gas discharge tube is caused, so that the gas discharge tube is rapidly changed from a high-resistance state to a low-resistance state to be conducted, and if the duration of the state is long, the gas discharge tube generates heat and is heated due to long-time or frequent overcurrent, namely, the control heat quantity in the embodiment is formed; the control heat generated by the gas discharge tube is transferred to the over-temperature over-current protection device in a thermal coupling mode, so that the over-temperature over-current protection device is simultaneously acted by abnormal current and the control heat, and the response speed of abnormal disconnection is accelerated.

Meanwhile, when the abnormal current is small and does not reach the protection threshold of the over-temperature and over-current device, the gas discharge tube is still affected by the abnormal voltage to generate control heat, and then the control heat is thermally coupled and transmitted to the over-temperature and over-current protection device, so that the over-temperature and over-current protection device is disconnected under the action of the control heat, and the safety protection of the safety device in the embodiment is realized under the condition that the abnormal voltage of the external circuit is small.

In addition, when surge and impulse current situations occur in the external circuit, due to the fact that the abnormal energy maintaining time is short, the heat generated by instant breakdown of the gas discharge tube is small, the over-temperature over-current protection device can bear abnormal current or heat within a standard requirement range, short circuit of the main circuit is further kept, and the harmful voltage is discharged to a protection ground through the gas discharge tube.

With the safety device in the embodiment, the protection unit in the safety installation can control the connection between the external line port and the internal line port according to abnormal current and/or control heat through the over-current over-temperature protection device arranged between the external line port and the internal line port; the abnormal current is the voltage of the external circuit, and the control heat is the heat which is generated when the gas discharge tube in the control unit breaks down due to the abnormal voltage and is transferred to the outside in a thermal coupling mode. Therefore, the safety device in this embodiment can solve the problem that the installation device in the related art cannot achieve effective safety protection, so as to achieve the effect of effectively protecting the internal circuit.

Specifically, the safety device in this embodiment uses the over-temperature overcurrent device as a circuit switch between the external circuit and the internal circuit, and uses a thermal coupling mode to make the over-temperature overcurrent device be controlled to be turned on and off by the abnormal current of the external circuit and the control heat generated by the gas discharge tube, so that the over-temperature overcurrent device can be turned off and responded rapidly under the overcurrent condition, thereby overcoming the defect that the safety device in the related art cannot rapidly and effectively turn off the external circuit under the conditions of abnormal high voltage and large current, and realizing the protection of circuit breaking under the condition of small abnormal current.

In an optional embodiment, the protection unit 108 is configured to: and under the condition that the abnormal current is greater than or equal to the current threshold value and/or the control heat is greater than or equal to the heat threshold value, the over-current over-temperature protection device is turned off to disconnect the external wire port and the internal wire port.

In an alternative embodiment, the over-current and over-temperature protection device 1082 comprises:

an external connection end 10822 configured to connect with an external port;

an internal wire connection end 10824 configured to connect with an internal wire port;

at least one of the outer line connecting terminal 10822 and the inner line connecting terminal 10824 is thermally coupled to the gas discharge tube 1062.

Fig. 4 is a schematic diagram of a gas discharge tube and an overcurrent and overtemperature protection device provided according to an embodiment of the present invention, wherein the gas discharge tube and the overcurrent and overtemperature protection device are thermally coupled as shown in fig. 4. Through the technical scheme described in the above optional embodiment, at least part of the over-current and over-temperature protection device and the gas discharge tube can be kept in thermal coupling connection.

In an optional embodiment, the security device in this embodiment further includes: a PCB pad 110;

wherein the gas discharge tube 1062 is disposed on the PCB pad 110, in the over-current over-temperature protection device 1082, at least one of the external wire connection terminal 10822 and the internal wire connection terminal 10824 is disposed on the PCB pad 110, and the gas discharge tube 106 is thermally coupled to the external wire connection terminal 10822 and/or the internal wire connection terminal 10824 on the PCB pad 110.

It should be further noted that, in the above alternative embodiment, the gas discharge tube is disposed on the PCB pad in a pin package or a chip package manner; for the pin packaging mode, the gas discharge tube can be directly welded on the PCB bonding pad; for the chip packaging method, the gas discharge tube can be directly soldered on the PCB pad, or can be fixed on the PCB pad by a metal clamp soldered on the PCB pad. Similarly, the outer wire connecting end or the inner wire connecting end of the over-current over-temperature protection device can also be arranged on the PCB pad in the above mode. The gas discharge tube and the over-current over-temperature protection device are thermally coupled through a PCB pad as shown in FIG. 4.

Through the technical scheme described in the optional embodiment, the structure of the safety device is realized by arranging the related device on the PCB bonding pad so as to replace the mechanical structure of the safety device in the related technology; because the electronic elements are pasted on the PCB bonding pad, high-efficiency generation can be realized, and the requirement on the precision of manufacturing or assembling is not high, the corresponding security device can be suitable for large-scale production.

In an optional embodiment, the protection unit includes:

an external wire bonding pad 1084 configured to connect an external wire connection terminal 10822 of the overcurrent and overtemperature protection device;

an internal wire pad 1086 configured to connect the internal wire connection terminal 10824 of the over-current over-temperature protection device; wherein the inner wire pad 1086 is connected above the PCB pad 110.

To be further explained, the connection relationship between the inner wire bonding pad and the PCB bonding pad is shown in fig. 4.

In an optional embodiment, the over-current and over-temperature protection device includes: fusing the alloy.

It should be further explained that the overcurrent and overtemperature protection device in this embodiment needs to select a rated current to meet related standards, such as requirements for surge and inrush current in ITU k.20; specifically, the overcurrent and overtemperature protection device in this embodiment may be composed of a ceramic fuse, and in the above optional embodiment, the fusing alloy included in the overcurrent and overtemperature protection device is the fusing alloy arranged inside the ceramic fuse, and the fusing temperature of the fusing alloy inside the ceramic fuse is about 300 ℃, so that the requirement of reflow soldering is met.

In an optional embodiment, the security device further comprises: a failure alarm indication unit 112; the position of the failure alarm indication unit in the security device is as described above in figure 3. Fig. 5 is a functional diagram of a failure alarm indication unit according to an embodiment of the present invention, and as shown in fig. 5, the failure alarm indication unit 112 includes:

an indication subunit 1122;

a switch subunit 1124 configured to be thermally coupled to the gas discharge tube 1062 to open/close according to the control heat;

a power subunit 1126 configured to power the indication subunit 1122 via the switch subunit 1124 to cause the indication subunit 1122 to perform a failure alarm indication.

It should be further noted that the failure alarm indication unit in the above-mentioned alternative embodiment can be used for performing failure alarm indication when the security unit fails, that is, the gas discharge tube is broken down by abnormal voltage of the external line loop. Specifically, the indicating subunit in the security unit may perform the failure alarm indication when the switch subunit is closed, that is, the power supply subunit supplies power to the indicating subunit; the switch subunit is similar to an over-temperature over-current protection device, and the heat generated when the gas discharge tube is broken down by the abnormal voltage of the external circuit is transferred to the control heat at the switch subunit through thermal coupling to control the opening and closing of the switch subunit. Therefore, the failure alarm indication unit in the above-described alternative embodiment can perform efficient failure alarm processing when the mounting device fails.

It should be further noted that the indicating subunit may perform the failure warning indication in various manners, for example, an LED lamp or a buzzer for performing sound and light indication, and in an alternative embodiment, the indicating subunit may further generate a failure warning signal to indicate the system and the related personnel in the case of being connected to the power supply subunit.

In an optional embodiment, the security device further comprises: a ground port 114;

the switch subunit 1124 includes:

a switch contact 11242 disposed between the ground port 114 and the indication subunit 1122 and configured to control conduction of the switch subunit 1124 through connection with the ground port 114;

a high temperature film 11244 disposed between the switch contact 11242 and the ground port 114 and thermally coupled to the gas discharge tube; the high temperature film 11244 is configured to melt in the case where the control heat is greater than or equal to the heat threshold value, so that the switch contact is connected to the ground port; alternatively, in the case where the control heat is less than the heat threshold, the switch contact is made to be separated from the ground port.

Fig. 6 is a schematic diagram of the switch subunit provided according to the embodiment of the present invention being opened, and fig. 7 is a schematic diagram of the switch subunit provided according to the embodiment of the present invention being closed; in the above-mentioned alternative embodiment, as shown in fig. 6 and 7, the switch subunit is short-circuited between the switch contact and the ground port to supply power from the power supply subunit to the indication subunit. In the switch subunit, the high-temperature film can play a role of isolating the switch contact from the grounding port in a conventional state; when the external circuit has abnormal voltage, the high-temperature film can be melted under the influence of control heat transmitted to the high-temperature film by the thermal coupling when the gas discharge tube breaks down, so that the switch contact is contacted with the grounding port. The heat threshold in the above alternative embodiment is the lowest temperature at which the high temperature film can be melted. In the switch subunit, the specific structures of the switch contact and the high-temperature film may be various, and the following description is given by an alternative embodiment, which is not repeated herein.

In an alternative embodiment, the ground port is connected to the gas discharge tube; the security device also includes PCB pads 110; wherein the gas discharge tube 106 is disposed above the PCB pad 110;

switch contact 10242 is configured to be disposed over PCB pad 110 with high temperature film 10244 disposed between the switch contact and the PCB pad.

Fig. 8 is a structural plan view of a switch sub-unit provided according to an embodiment of the present invention, and fig. 9 is a structural side view of the switch sub-unit provided according to an embodiment of the present invention; the structure of the switch subunit in the above alternative embodiment is shown in fig. 8 and 9. As shown in fig. 8 and 9, an electrode 10622 of the gas discharge tube 1062 connected to a ground port is electrically and thermally connected to one end of a switch subunit in which a high temperature film 11244 is provided at the opposite end to the gas discharge tube through the PCB pad 110. The high temperature film 11244 is provided with a movable contact made of a metal dome, i.e., the switch contact 11242 in the above-described alternative embodiment. One end of the metal spring sheet is in contact with the high temperature film, and the other end is fixed in the PCB pad 110. The housing of the security device of this embodiment may provide a protrusion to the metal dome 11242 during the installation process to apply an external force to the metal dome 11242 as shown by the arrow in fig. 8, so that a certain contact force is provided between the metal dome 11242 and the high temperature film 11244.

Under the normal condition, the high temperature film plays the function of keeping apart the contact of PCB pad and metal shrapnel to guarantee to play insulating effect between the two, realize the function that the warning switch K that became invalid breaks off. Once abnormal harmful voltage causes breakdown heating of the gas discharge tube, the heat is coupled to the contact of the metal elastic sheet through the PCB pad, when the temperature reaches above 280 ℃, the high-temperature film starts to melt and decompose, so that the contact of the metal elastic sheet and the PCB pad are in short circuit, namely the contact of the metal elastic sheet and the protection ground are in electrical short circuit, the closing function of the failure alarm switch K is realized, a loop is formed through an external-48V current-limiting power supply, the LED is lightened, and S outputs a level signal close to the protection ground E to a network management system to indicate that a security unit fails.

In an alternative embodiment, the ground port 114 is connected to the gas discharge tube 106;

the switch contacts 11242 are configured to be disposed over the electrodes of the gas discharge tube 106 with the high temperature membrane disposed between the switch contacts and the gas discharge tube.

Fig. 10 is a schematic structural diagram of a switch subunit provided according to an embodiment of the present invention, and the structure of the switch subunit in the above-mentioned alternative embodiment is shown in fig. 10. As shown in fig. 10, the M-shaped metal dome forms the switch contact, and a high temperature film 11244 is disposed between the electrode 10622 of the gas discharge tube 1062 connected to the protection ground and the M-shaped metal dome 11242. Two end points of the metal dome 11242 are respectively fixed in the PCB pad 110, and a certain force is applied to the metal dome by the structural design of the security device, so that the metal dome 11242 and the high temperature film 11244 have a certain contact force.

Under the normal condition, the high temperature film plays the function of keeping apart the contact of PCB pad and metal shrapnel to guarantee to play insulating effect between the two, realize the function that the warning switch K that became invalid breaks off. Once abnormal harmful voltage causes breakdown heating of the gas discharge tube, the heat is coupled to a contact of the metal elastic sheet through a PCB (printed Circuit Board) bonding pad, when the temperature reaches above 280 ℃, the high-temperature film starts to melt and decompose, so that the metal elastic sheet and an electrode of the gas discharge tube are in short circuit, namely the metal elastic sheet is electrically short-circuited with a protection ground, the closing function of the failure alarm switch K is realized, a loop is formed through an external-48V current-limiting power supply, the LED is lightened, and S outputs a level signal close to the protection ground E to a network management to indicate that a security unit fails. In the above optional embodiment, the metal spring piece also plays a role in fixing the gas discharge tube, so as to prevent the gas discharge tube from shifting or falling off due to the melting of soldering tin of the soldering pad when the gas discharge tube generates heat.

In an alternative embodiment, the high temperature film is a polystyrene film.

In an optional embodiment, the security device further comprises: and a positive temperature coefficient thermistor PTCR116 disposed between the protection unit 108 and the internal wire port 104.

It should be further noted that the PTCR in the above alternative embodiment can limit the external hazard current from flowing into the inner loop when the hazard voltage generated by the outer loop continues to appear, and can also act as a decoupling between the security unit and the protection port secondary protection circuit in case of rapid pulse interference such as surge.

Example 2

This embodiment provides a security method, which is applied to the security device in embodiment 1, and fig. 11 is a flowchart of the security method according to the embodiment of the present invention, as shown in fig. 1, the security method in this embodiment includes:

s202, acquiring abnormal current and controlling heat;

s204, controlling the connection between the external line port and the internal line port by the overcurrent over-temperature protection device according to the abnormal current and/or the control heat;

the abnormal current is current caused by abnormal voltage of the external circuit, and the heat is controlled to be heat generated when the gas discharge tube is broken down by the abnormal voltage and transferred to the outside in a thermal coupling mode; the over-current over-temperature protection device is connected with the gas discharge tube through thermal coupling.

It should be further noted that other optional embodiments and technical features of the security method in this embodiment correspond to those of the security device described in embodiment 1, and therefore, no further description is provided herein.

In an optional embodiment, the controlling the connection between the external line port and the internal line port by the over-current and over-temperature protection device according to the abnormal current and/or the control heat includes:

and under the condition that the abnormal current is greater than or equal to the current threshold value and/or the control heat is greater than or equal to the heat threshold value, the over-current over-temperature protection device is turned off to disconnect the external wire port and the internal wire port.

In an optional embodiment, the security method in this embodiment further includes:

the switch subunit is connected with the gas discharge tube through thermal coupling so as to be opened/closed according to the control heat.

Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.

Example 3

The present embodiment provides a security device including:

a control unit including a gas discharge tube;

a failure alarm indication unit comprising:

an indicating subunit;

a switch subunit, which is configured to be thermally coupled with the gas discharge tube to open/close according to the control heat; controlling the heat generated when the gas discharge tube is broken down by abnormal voltage and transferred to the outside in a thermal coupling mode; the abnormal voltage is the voltage of the external circuit under the abnormal condition;

and the power supply subunit is configured to supply power to the indicating subunit through the switch subunit so as to enable the indicating subunit to carry out failure alarm indication.

It should be further noted that the security device in this embodiment corresponds to the failure alarm indication unit in the security device described in embodiment 1, that is, other optional embodiments and technical effects of the security device in this embodiment correspond to those of the failure alarm indication unit described in embodiment 1, and therefore, no further description is given here.

In an optional embodiment, the security device further comprises: a ground port;

the switch subunit includes:

the switch contact is arranged between the grounding port and the indicating subunit and is configured to control the conduction of the switch subunit through the connection with the grounding port;

the high-temperature film is arranged between the switch contact and the grounding port and is connected with the gas discharge tube through thermal coupling; the high temperature membrane is configured to melt when the control heat is greater than or equal to the heat threshold, such that the switch contact is connected with the ground port; alternatively, in the case where the control heat is less than the heat threshold, the switch contact is made to be separated from the ground port.

In an alternative embodiment, the ground port is connected to the gas discharge tube; the security device also comprises a PCB pad; wherein, the gas discharge tube is arranged on the PCB bonding pad;

the switch contact is configured to be disposed over a PCB pad with the high temperature membrane disposed between the switch contact and the PCB pad.

It should be further noted that the above-mentioned alternative embodiment is an implementation manner of the switch subunit described in fig. 8 and fig. 9.

In an alternative embodiment, the ground port is connected to the gas discharge tube;

the switch contact is configured to be disposed over an electrode of the gas discharge tube, and the high temperature film is disposed between the switch contact and the gas discharge tube.

It should be further noted that the above-mentioned alternative embodiment is an implementation of the switch subunit described in fig. 10.

In an alternative embodiment, the high temperature film is a polystyrene film.

In an alternative embodiment, the indication subunit is configured to generate the failure warning signal in case of a connection to the power supply subunit.

Example 4

The present embodiment provides a security method applied to the security device described in embodiment 3 above, and fig. 12 is a flowchart (ii) of the security method provided according to the embodiment of the present invention, and as shown in fig. 2, the security method in the present embodiment includes:

s402, the power supply subunit is controlled to supply power to the indicating subunit through the switch subunit, so that the indicating subunit performs failure alarm indication;

wherein the switch subunit is connected to the gas discharge tube by thermal coupling to be opened/closed according to the control heat; controlling the heat generated when the gas discharge tube is broken down by abnormal voltage and transferred to the outside in a thermal coupling mode; the abnormal voltage is the voltage of the external circuit under the abnormal condition.

It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A security device, comprising:

an outside line port configured to be connected to an outside line loop;

an internal line port configured to connect to an internal line loop;

a control unit including a gas discharge tube;

2. The apparatus of claim 1, wherein the protection unit is configured to: and under the condition that the abnormal current is greater than or equal to a current threshold value and/or the control heat is greater than or equal to a heat threshold value, the over-current over-temperature protection device is turned off so as to disconnect the connection between the external line port and the internal line port.

3. The apparatus of claim 1, wherein the over-current over-temperature protection device comprises:

an external connection end configured to be connected to the external port;

an internal wire connection end configured to connect with the internal wire port;

at least one of the outer wire connecting end and the inner wire connecting end is connected with the gas discharge tube through thermal coupling.

4. The device of claim 3, wherein the security device further comprises: a PCB pad;

the gas discharge tube is arranged on the PCB bonding pad, at least one of the outer line connecting end and the inner line connecting end is arranged on the PCB bonding pad in the over-current over-temperature protection device, and the gas discharge tube is connected with the outer line connecting end and/or the inner line connecting end on the PCB bonding pad through thermal coupling.

5. The apparatus of claim 4, wherein the protection unit comprises:

the outer wire bonding pad is configured to be connected with the outer wire connecting end of the over-current over-temperature protection device;

an internal wire bonding pad configured to connect the internal wire connection end of the overcurrent over-temperature protection device; wherein the inner wire pad is connected over the PCB pad.

6. The apparatus of claim 5, wherein the over-current over-temperature protection device comprises: fusing the alloy.

7. The device of claim 1, wherein the security device further comprises: a failure alarm indication unit; the failure alarm indication unit includes:

an indicating subunit;

a switch subunit, configured to be thermally coupled to the gas discharge tube to open/close according to the control heat;

8. The device of claim 7, wherein the security device further comprises: a ground port;

the switch subunit includes:

the switch contact is arranged between the grounding port and the indicating subunit and is configured to be connected with the grounding port to control the conduction of the switch subunit;

the high-temperature film is arranged between the switch contact and the grounding port and is connected with the gas discharge tube through thermal coupling; the high temperature membrane is configured to melt if the control heat is greater than or equal to a heat threshold such that the switch contact is connected to the ground port; alternatively, the switch contact is caused to disengage from the ground port in the event that the control heat is less than a heat threshold.

9. The apparatus of claim 8, wherein the ground port is connected to the gas discharge tube; the security device further comprises a PCB pad; wherein the gas discharge tube is disposed over the PCB pad;

the switch contact is configured to be disposed over the PCB pad, and the high temperature membrane is disposed between the switch contact and the PCB pad.

10. The apparatus of claim 8, wherein the ground port is connected to the gas discharge tube;

11. The apparatus of claim 8, wherein the high temperature film is a polystyrene film.

12. The apparatus of claim 7, wherein the indication subunit is configured to generate a failure warning signal in the event of a connection with the power supply subunit.

13. The device of claim 1, wherein the security device further comprises: a positive temperature coefficient thermistor PTCR disposed between the protection unit and the internal wire port.

14. A security method applied to the security device described in any one of claims 1 to 13, the security method comprising:

acquiring abnormal current and controlling heat quantity;

15. The method of claim 14, wherein controlling the connection between the external wire port and the internal wire port by the over-current over-temperature protection device according to the abnormal current and/or the control heat comprises:

and under the condition that the abnormal current is greater than or equal to a current threshold value and/or the control heat is greater than or equal to a heat threshold value, the over-current over-temperature protection device is turned off so as to disconnect the connection between the external line port and the internal line port.

16. The method of claim 14, further comprising:

17. A security device, comprising:

a control unit including a gas discharge tube;

a failure alarm indication unit comprising:

an indicating subunit;

18. The device of claim 17, wherein the security device further comprises: a ground port;

the switch subunit includes:

19. The apparatus of claim 18, wherein the ground port is connected to the gas discharge tube; the security device further comprises a PCB pad; wherein the gas discharge tube is disposed over the PCB pad;

20. The apparatus of claim 18, wherein the ground port is connected to the gas discharge tube;

21. The apparatus of claim 18, wherein the high temperature film is a polystyrene film.

22. The apparatus of claim 17, wherein the indication subunit is configured to generate a failure warning signal in the event of a connection to the power supply subunit.

23. A security method applied to the security device of any one of claims 17 to 22, the security method comprising: