A terminal camera network extension device supporting a bypass function for mining and a method thereof

Abstract

The application provides a terminal camera network extension device supporting a bypass function for mining and a method thereof.The device comprises a camera, an Ethernet exchange module, a bypass circuit, a DSL communication module, an intrinsic safety protection module and a twisted pair interface.A bypass circuit is arranged between the Ethernet exchange module and the DSL communication module, so that the DSL communication module can play a relay role, and even if power is cut off, the bypass circuit can make the DSL communication module directly connected, so that the twisted pair interface can still perform signal amplification through the DSL communication module, and the communication distance of the DSL port is not affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of network communication technology, in particular to a terminal camera network extension device supporting bypass function for mine and a method thereof. BACKGROUND

[0002] With more and more attention to personnel safety in the coal industry, real-time monitoring of the environment for mine during personnel construction is particularly important, so in the mining industry, the monitoring system is an essential important system. Although optical fiber can be used in mobile monitoring equipment for long-distance transmission, optical fiber cannot be arbitrarily rotated with movement, which may cause optical fiber breakage problem, and the already laid twisted pair telephone line on the old mine can be reasonably utilized for long-distance transmission through a bandwidth of about 10M, so the device supporting long-distance transmission of Ethernet through twisted pair line is generated.

[0003] For example, Chinese patent CN101710870B discloses a mine long-distance Ethernet access and data transmission method, which fully utilizes the high bandwidth, low cost, scalability and easy deployment of Ethernet technology, and the characteristics of xDSL, such as bidirectional high-speed variable bit rate link, maximum transmission distance of more than 1km on 0.4mm twisted pair line and simple and convenient deployment, etc. However, when the power supply is abnormal, the twisted pair interface cannot amplify the signal, resulting in an affected communication distance. SUMMARY

[0004] Therefore, the present application provides a terminal camera network extension device supporting bypass function for mine and a method thereof to solve the problem that the existing twisted pair interface cannot amplify the signal when the power supply is abnormal, resulting in an affected communication distance.

[0005] The technical scheme of the present application is implemented as follows: on the one hand, the present application provides a terminal camera network extension device supporting bypass function for mine, wherein the device comprises:

[0006] a camera, an Ethernet exchange module, a bypass circuit, a DSL communication module, an intrinsic safety protection module and a twisted pair interface;

[0007] The camera is electrically connected with the Ethernet exchange module, and is used for converting image signals into Ethernet signals and transmitting the Ethernet signals to the Ethernet exchange module.

[0008] The Ethernet exchange module is electrically connected with the bypass circuit, and is used for exchanging and processing Ethernet signals from the camera and the DSL communication module.

[0009] The Bypass circuit is electrically connected with the DSL communication module, and is used for physically connecting the DSL communication module with signals after power failure.

[0010] The DSL communication module is electrically connected with the intrinsic safety protection module, and is used for converting a DSL signal into an Ethernet signal and transmitting the Ethernet signal to the Ethernet switching module.

[0011] The intrinsic safety protection module is electrically connected with the twisted-pair line interface, and is used for making the input and output of a DSL port meet intrinsic safety requirements.

[0012] The twisted-pair line interface is used for providing a DSL physical interface.

[0013] On the basis of the above technical scheme, preferably, the DSL communication module comprises a DSL communication module one and a DSL communication module two.

[0014] The intrinsic safety protection module comprises an intrinsic safety protection module one and an intrinsic safety protection module two.

[0015] The twisted-pair line interface comprises a twisted-pair line interface one and a twisted-pair line interface two.

[0016] The Bypass circuit is electrically connected with the DSL communication module one, the intrinsic safety protection module one and the twisted-pair line interface one in sequence.

[0017] The Bypass circuit is electrically connected with the DSL communication module two, the intrinsic safety protection module two and the twisted-pair line interface two in sequence.

[0018] On the basis of the above technical scheme, preferably, the technical scheme further comprises:

[0019] A power conversion circuit.

[0020] The power conversion circuit is electrically connected with the camera and the Ethernet switching module, and is externally connected with a power supply, and is used for supplying power to the camera and the Ethernet switching module.

[0021] On the basis of the above technical scheme, preferably, the technical scheme further comprises:

[0022] A charging circuit, a storage battery and an intrinsic safety protection circuit.

[0023] The power conversion circuit is electrically connected with the charging circuit and the storage battery in sequence, is externally connected with a power supply, and is used for charging the storage battery.

[0024] The storage battery is electrically connected with the intrinsic safety protection circuit, and is used for supplying power to the DSL communication module one and the DSL communication module two.

[0025] On the basis of the above technical scheme, preferably, the specific circuit of the intrinsic safety protection circuit comprises:

[0026] Fuse F0, voltage stabilizing tube D0 and resistor R0;

[0027] The front end of the fuse F0 is connected with the output end of the battery, the rear end of the fuse F0 is connected with the negative pole of the voltage stabilizing tube D0 and the front end of the resistor R0, the rear end of the resistor R0 is connected with the power input end of the load, the positive pole of the voltage stabilizing tube D0 is connected with the output end of the battery and the power input end of the load.

[0028] On the basis of the above technical scheme, preferably, further comprising:

[0029] Bypass control module and alarm output module;

[0030] The Bypass control module is electrically connected with the Bypass circuit and the alarm output module respectively, and is used for controlling the Bypass circuit to start the Bypass function and controlling the alarm output module to alarm the maintenance personnel when the power conversion circuit is powered off or fails.

[0031] The intrinsic safety protection circuit is also electrically connected with the Bypass control module and the alarm output module respectively.

[0032] On the basis of the above technical scheme, preferably, the specific circuit of the Bypass circuit comprises:

[0033] Relay K1, K2 and diode D1, D2;

[0034] The common contact of the relay K1 is connected with the DSL communication module one, the upper contact of the relay K1 is connected with the upper contact of the relay K2, the lower contact of the relay K1 is connected with the Ethernet exchange module, the upper end of the coil of the relay K1 is connected with the negative pole of the diode D1 and VDD, the lower end of the coil of the relay K1 is connected with the positive pole of the diode D1, the lower end of the coil of the relay K2 and the positive pole of the diode D2, the upper end of the coil of the relay K2 is connected with the negative pole of the diode D2 and VDD, the common contact of the relay K2 is connected with the DSL communication module two, and the lower contact of the relay K2 is connected with the Ethernet exchange module.

[0035] On the basis of the above technical scheme, preferably, the specific circuit of the Bypass control module comprises:

[0036] MCU, triode Q1 and resistors R1, R2, R3;

[0037] The collector of the triode Q1 is connected with the positive poles of the diodes D1, D2, the emitter of the triode Q1 is connected with the rear ends of the resistors R2, R3 and the ground, the base of the triode is connected with the front ends of the resistors R1, R3, the rear end of the resistor R1 is connected with the front end of the resistor R2 and the MCU, and the MCU is connected with the Ethernet exchange module and BT_VDD.

[0038] In another aspect, the present application provides a method for using a terminal camera network extension device supporting a bypass function in a mine, which uses the terminal camera network extension device supporting a bypass function in a mine as described above, and the method comprises the following steps:

[0039] S1. When the device power supply is abnormal or the power conversion circuit fails, VDD has no output, the common contact and the upper contact of the relays K1 and K2 are in contact, the DSL communication module one and the DSL communication module two are directly communicated without passing through the Ethernet exchange module, the twisted pair interface performs signal amplification through the DSL communication module, the Ethernet exchange module informs the MCU unit that the Ethernet is abnormal, and then the MCU controls the relay to output an alarm;

[0040] S2. When the Ethernet exchange module packet loss is serious and the VDD output is normal, the Ethernet exchange module informs the MCU in the Bypass control module that the Ethernet exchange module communication is abnormal, then the MCU unit controls the triode Q1 to be closed, the signal ground of the relays K1 and K2 is disconnected, the relays K1 and K2 are not in a working state, the common contact and the upper contact of the relays K1 and K2 are in contact, the DSL communication module one and the DSL communication module two are directly communicated without passing through the Ethernet exchange module, the twisted pair interface performs signal amplification through the DSL communication module, the Ethernet exchange module informs the MCU unit that the Ethernet is abnormal, and then the MCU controls the relay to output an alarm.

[0041] The terminal camera network extension device supporting a bypass function in a mine and the method of the present application have the following beneficial effects compared with the prior art:

[0042] (1) By setting the Bypass circuit between the Ethernet exchange module and the DSL communication module, the DSL communication module can play a relay role, even if the power is off, the Bypass circuit can make the DSL communication module directly communicate, so that the twisted pair interface can still perform signal amplification through the DSL communication module, and the DSL port communication distance will not be affected;

[0043] (2) The power conversion circuit and the battery only supply power to part of the modules, so that the device is greatly reduced in size and cost;

[0044] (3) The intrinsic safety protection circuit is set, so that the battery output (BT_VDD) meets the intrinsic safety requirements. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0046] Figure 1 Module diagram of the terminal camera network extension device supporting the bypass function for mining of the present application;

[0047] Figure 2 Connection relationship diagram of the power conversion circuit of the present application;

[0048] Figure 3 Safety protection circuit diagram of the present application;

[0049] Figure 4 Bypass function principle diagram of the present application. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the embodiments of the present application. Obviously, the described embodiments only constitute some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0051] Embodiment one

[0052] As shown in Figure 1 , a terminal camera network extension device supporting the bypass function for mining of the present application, wherein the device comprises:

[0053] a camera, an Ethernet exchange module, a bypass circuit, a DSL communication module, a safety protection module, and a twisted pair interface;

[0054] The camera is electrically connected with the Ethernet exchange module, and is used to convert image signals into Ethernet signals and transmit the Ethernet signals to the Ethernet exchange module. The camera is prior art;

[0055] The Ethernet exchange module is electrically connected with the bypass circuit, and is used to exchange and process Ethernet signals from the camera and the DSL communication module;

[0056] The bypass circuit is electrically connected with the DSL communication module, and is used to physically connect signals of the DSL communication module after power failure;

[0057] The DSL communication module is electrically connected with the intrinsic safety protection module, and is used for converting a DSL signal into an Ethernet signal and transmitting the Ethernet signal to the Ethernet switching module.

[0058] The intrinsic safety protection module is electrically connected with the twisted-pair line interface, and is used for making the input and output of the DSL port meet the intrinsic safety requirement.

[0059] The twisted-pair line interface is used for providing a DSL physical interface.

[0060] The device sets a Bypass circuit between the Ethernet switching module and the DSL communication module, so that the DSL communication module can play a relay role, and even if power is cut off, the Bypass circuit can make the DSL communication module directly connected, so that the twisted-pair line interface can still perform signal amplification through the DSL communication module, and the communication distance of the DSL port is not affected.

[0061] The DSL communication module includes a DSL communication module one and a DSL communication module two.

[0062] The intrinsic safety protection module includes an intrinsic safety protection module one and an intrinsic safety protection module two.

[0063] The twisted-pair line interface includes a twisted-pair line interface one and a twisted-pair line interface two.

[0064] The Bypass circuit is electrically connected with the DSL communication module one, the intrinsic safety protection module one and the twisted-pair line interface one in sequence.

[0065] The Bypass circuit is electrically connected with the DSL communication module two, the intrinsic safety protection module two and the twisted-pair line interface two in sequence.

[0066] When power is cut off, the Bypass circuit can make the DSL communication module one and the DSL communication module two directly connected without passing through the Ethernet switching module, so that the twisted-pair line interface can still perform signal amplification through the DSL communication module, and the communication distance of the DSL port is not affected.

[0067] The device further includes a power conversion circuit.

[0068] The power conversion circuit is electrically connected with the camera and the Ethernet switching module, and is externally connected with a power supply, and is used for supplying power to the camera and the Ethernet switching module.

[0069] As shown in the figure, the product power input is input to the power conversion circuit, and the power conversion circuit converts the input voltage into a relatively low voltage VDD, and the VDD supplies power to the Ethernet switching module and the camera which have relatively large power consumption.

[0070] As shown in the figure, the product power input is input to the power conversion circuit, and the power conversion circuit converts the input voltage into a relatively low voltage VDD, and the VDD supplies power to the Ethernet switching module and the camera which have relatively large power consumption. Figure 2 ​

[0071] This also includes:

[0072] Charging circuit, battery, and intrinsically safe protection circuit;

[0073] The power conversion circuit is electrically connected in sequence to the charging circuit and the storage battery, and is connected to an external power source for charging the storage battery.

[0074] The battery is electrically connected to the intrinsically safe protection circuit and is used to supply power to DSL communication module one and DSL communication module two.

[0075] like Figure 2 As shown, after the product's power input is supplied to the power conversion circuit, the power conversion circuit transforms the input voltage into a relatively low voltage VDD. The VDD voltage charges the battery through the overcurrent and overvoltage protection circuit. The battery then supplies power to the DSL communication modules 1 and 2, which have lower power consumption, through the intrinsically safe protection circuit, enabling them to operate normally. Due to the intrinsically safe protection circuit, the battery output (BT_VDD) meets intrinsically safe requirements. Ordinary energy storage modules need to power all modules, including the camera and Ethernet switching module, requiring a large amount of energy, which limits their size and weight. This device's power conversion circuit and battery only power a portion of the modules, thus significantly reducing the device's size and cost.

[0076] Among them, such as Figure 3 As shown, the specific circuit of the intrinsically safe protection circuit includes:

[0077] Fuse F0, Zener diode D0, and resistor R0;

[0078] The front end of fuse F0 is connected to the output terminal of the battery, the rear end of fuse F0 is connected to the negative terminal of Zener diode D0 and the front end of resistor R0, the rear end of resistor R0 is connected to the power input terminal of the load, and the positive terminal of Zener diode D0 is connected to both the output terminal of the battery and the power input terminal of the load.

[0079] Resistor R0 is a current-limiting resistor; when the specified current is exceeded, fuse F0 blows. Zener diode D0 is a voltage regulator; when the specified voltage is exceeded, Zener diode D0 short-circuits, causing fuse F0 to blow. Fuse F0 is a full-blow fuse; it blows when the specified voltage or current in the circuit exceeds the specified limit, thus protecting intrinsically safe output devices. The selection of these device parameters must comply with the intrinsically safe standard GB3836: the maximum power of Zener diode D0 must be greater than the rated current of fuse F0 * 1.7 * intrinsically safe factor (1.5) * the maximum voltage of Zener diode D0; the power requirement of resistor R0 must be greater than (the rated current of fuse F0 * 1.7). 2 *Intrinsic safety factor (1.5)* Maximum resistance value of resistor R0 (positive resistance tolerance value).

[0080] Further comprising:

[0081] Bypass control module and alarm output module;

[0082] The Bypass control module is electrically connected with the Bypass circuit and the alarm output module respectively, and is used for controlling the Bypass circuit to start the Bypass function and controlling the alarm output module to alarm the maintenance personnel when the power conversion circuit is powered off or fails.

[0083] The intrinsic protection circuit is also electrically connected with the Bypass control module and the alarm output module respectively.

[0084] After the product power supply is input to the power conversion circuit, the power conversion circuit converts the input voltage into a relatively low voltage VDD, the VDD voltage charges the storage battery through the overcurrent and overvoltage protection circuit, and the storage battery supplies power to the Bypass control module and the alarm output module with small power consumption through the intrinsic protection circuit, so that they work normally. Since the intrinsic protection circuit is arranged, the output (BT_VDD) of the storage battery meets the intrinsic safety requirements.

[0085] As shown in the specific circuit of the Bypass circuit, Figure 4

[0086] Relay K1, K2 and diode D1, D2;

[0087] The common contact of the relay K1 is connected with the DSL communication module one, the upper contact of the relay K1 is connected with the upper contact of the relay K2, the lower contact of the relay K1 is connected with the Ethernet exchange module, the upper end of the coil of the relay K1 is connected with the negative electrode of the diode D1 and VDD, the lower end of the coil of the relay K1 is connected with the positive electrode of the diode D1, the lower end of the coil of the relay K2 and the positive electrode of the diode D2, the upper end of the coil of the relay K2 is connected with the negative electrode of the diode D2 and VDD, the common contact of the relay K2 is connected with the DSL communication module two, and the lower contact of the relay K2 is connected with the Ethernet exchange module.

[0088] ​The bypass circuit realizes the physical signal communication between the two DSL communication modules after power failure, which is generally realized by a relay: when the power supply of the device is abnormal or the power conversion circuit fails, VDD has no output, so that the common contact and the upper contact of the relays K1 and K2 are in contact, thereby directly connecting the DSL communication module one and the DSL communication module two without passing through the Ethernet switching module. Since VDD has no output, but the battery still has a certain amount of electricity, and the intrinsically safe protection circuit can continue to supply power to the DSL communication module one, the DSL communication module two, the bypass control module, the alarm output module and the like (the power consumption of these modules is relatively small, and the battery can last for a long time). In this way, the twisted pair interface can still perform signal amplification through the DSL communication module (DSL as a relay), so that the communication distance of the DSL port is not affected; at the same time, since VDD has no output, the Ethernet switching module is in a non-working state, and the Ethernet switching module informs the MCU unit that the Ethernet is working abnormally, and then the MCU controls the relay to output an alarm.

[0089] As shown in Figure 4 , the specific circuit of the bypass control module comprises:

[0090] MCU, triode Q1 and resistors R1, R2 and R3.

[0091] The collector of the triode Q1 is connected to the anode of the diodes D1 and D2, the emitter of the triode Q1 is connected to the back end of the resistors R2 and R3 and the ground, the base of the triode is connected to the front end of the resistors R1 and R3, the back end of the resistor R1 is connected to the front end of the resistor R2 and the MCU, and the MCU is connected to the Ethernet switching module and BT_VDD.

[0092] When the Ethernet switching module has a serious packet loss and VDD output is normal, the Ethernet switching module will inform the MCU in the bypass control module that the Ethernet switching module communication is abnormal, and then the MCU unit controls the triode Q1 to be closed, so that the signal GND (ground) of the relays K1 and K2 is disconnected, and the relays K1 and K2 are not in a working state, thereby making the common contact and the upper contact of the relays K1 and K2 in contact, and finally making the DSL communication module one and the DSL communication module two directly connected without passing through the Ethernet switching module. In this way, the twisted pair interface can still perform signal amplification through the DSL communication module (DSL as a relay), so that the communication distance of the DSL port is not affected; at the same time, since VDD has no output, the Ethernet switching module is in a non-working state, and the Ethernet switching module informs the MCU unit that the Ethernet is working abnormally, and then the MCU controls the relay to output an alarm.

[0093] The device in the embodiment sets a bypass circuit between the Ethernet switching module and the DSL communication module, so that the DSL communication module can play a relay role, and even if power is cut off, the bypass circuit can make the DSL communication module directly communicate, so that the twisted pair interface can still perform signal amplification through the DSL communication module, and the communication distance of the DSL port is not affected.

[0094] Embodiment two

[0095] A use method of a terminal camera network extension device supporting a bypass function in a mine is provided, which adopts the terminal camera network extension device supporting the bypass function in the mine as described in embodiment one, and comprises the following steps.

[0096] S1. When the device power supply is abnormal or the power conversion circuit fails, VDD has no output, the common contact and the upper contact of the relays K1 and K2 are in contact, the DSL communication module one and the DSL communication module two are directly connected and do not pass through the Ethernet switching module, the twisted pair interface performs signal amplification through the DSL communication module, the Ethernet switching module informs the MCU unit that the Ethernet works abnormally, and then the MCU controls the relay output to alarm;

[0097] Since VDD has no output, but the storage battery has a certain amount of electricity, and the intrinsically safe protection circuit can continue to supply power to the DSL communication module one, the DSL communication module two, the bypass control module, the alarm output module and the like (the power consumption of these modules is small, and the storage battery can last for a long time). Thus, the twisted pair interface can still perform signal amplification through the DSL communication module (DSL as a relay), so that the communication distance of the DSL port is not affected; at the same time, since VDD has no output, the Ethernet switching module is in a non-working state, the Ethernet switching module informs the MCU unit that the Ethernet works abnormally, and then the MCU controls the relay output to alarm.

[0098] S2. When the Ethernet switching module packet loss is relatively serious and VDD output is normal, the Ethernet switching module informs the MCU in the bypass control module that the Ethernet switching module communication is abnormal, and then the MCU unit controls the triode Q1 to be closed, so that the signal GND (ground) of the relays K1 and K2 is disconnected, the relays K1 and K2 are not in a working state, the common contact and the upper contact of the relays K1 and K2 are in contact, the DSL communication module one and the DSL communication module two are directly connected and do not pass through the Ethernet switching module, the twisted pair interface performs signal amplification through the DSL communication module, the Ethernet switching module informs the MCU unit that the Ethernet works abnormally, and then the MCU controls the relay output to alarm;

[0099] Thus the twisted pair interface can still be signal amplified through the DSL communication module (DSL as a relay), so that the communication distance of the DSL port is not affected; meanwhile, since the VDD has no output, the Ethernet exchange module is in an inoperative state, the Ethernet exchange module informs the MCU unit that the Ethernet is in an abnormal working state, and then the MCU controls the relay output to alarm.

[0100] The method in the embodiment sets a bypass circuit between the Ethernet exchange module and the DSL communication module, so that the DSL communication module can play a relay role, and even if power is cut off, the bypass circuit can make the DSL communication module directly connected, so that the twisted pair interface can still be signal amplified through the DSL communication module, so that the communication distance of the DSL port is not affected.

[0101] The above merely describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A terminal camera network extension device supporting a bypass function for mining, characterized by: The device comprises: a camera, an Ethernet switching module, a bypass circuit, a DSL communication module, an intrinsic safety protection module, and a twisted pair interface; the camera is electrically connected with the Ethernet switching module, and is configured to convert image signals into Ethernet signals and transmit the Ethernet signals to the Ethernet switching module; the Ethernet switching module is electrically connected with the bypass circuit, and is configured to exchange and process Ethernet signals from the camera and the DSL communication module; the bypass circuit is electrically connected with the DSL communication module, and is configured to physically connect the DSL communication module with signals after power failure; the DSL communication module is electrically connected with the intrinsic safety protection module, and is configured to convert DSL signals into Ethernet signals and transmit the Ethernet signals to the Ethernet switching module; the intrinsic safety protection module is electrically connected with the twisted pair interface, and is configured to make DSL port input and output meet intrinsic safety requirements; the twisted pair interface is configured to provide a DSL physical interface.

2. The terminal camera network extension device for mine supporting bypass function according to claim 1, characterized in that: the DSL communication module comprises a DSL communication module one and a DSL communication module two; the intrinsic safety protection module comprises an intrinsic safety protection module one and an intrinsic safety protection module two; the twisted pair interface comprises a twisted pair interface one and a twisted pair interface two; the bypass circuit is electrically connected with the DSL communication module one, the intrinsic safety protection module one, and the twisted pair interface one in sequence; the bypass circuit is electrically connected with the DSL communication module two, the intrinsic safety protection module two, and the twisted pair interface two in sequence.

3. The terminal camera network extension device for mine supporting bypass function according to claim 2, characterized in that: Further comprising: a power conversion circuit; the power conversion circuit is electrically connected with the camera and the Ethernet switching module, and is externally connected with a power supply, and is configured to supply power to the camera and the Ethernet switching module.

4. The terminal camera network extension device for mine supporting bypass function of claim 3, characterized in that: Further comprising: a charging circuit, a storage battery, and an intrinsic safety protection circuit; the power conversion circuit is electrically connected with the charging circuit and the storage battery in sequence, and is externally connected with a power supply, and is configured to charge the storage battery; the storage battery is electrically connected with the intrinsic safety protection circuit, and is configured to supply power to the DSL communication module one and the DSL communication module two.

5. The terminal camera network extension device for mine supporting bypass function of claim 4, wherein: The specific circuit of the intrinsic safety protection circuit comprises: a fuse (F0), a voltage stabilizing tube (D0), and a resistor (R0); the front end of the fuse (F0) is connected with the output end of the storage battery, the rear end of the fuse (F0) is connected with the negative electrode of the voltage stabilizing tube (D0) and the front end of the resistor (R0), the rear end of the resistor (R0) is connected with the power input end of a load, the positive electrode of the voltage stabilizing tube (D0) is connected with the output end of the storage battery and the power input end of the load.

6. The terminal camera network extension device for mine supporting bypass function of claim 4, wherein: Further comprising: a bypass control module and an alarm output module; the bypass control module is electrically connected with the bypass circuit and the alarm output module respectively, and is configured to control the bypass circuit to start the bypass function and control the alarm output module to alarm maintenance personnel when the power conversion circuit is powered off or fails; the intrinsic safety protection circuit is also electrically connected with the bypass control module and the alarm output module respectively.

7. The terminal camera network extension device for mine supporting bypass function of claim 6, wherein: The specific circuit of the bypass circuit comprises: Relay (K1), (K2) and diode (D1), (D2); The common contact of the relay (K1) is connected with the DSL communication module one, the upper contact of the relay (K1) is connected with the upper contact of the relay (K2), the lower contact of the relay (K1) is connected with the Ethernet switch module, the upper end of the coil of the relay (K1) is connected with the negative pole of the diode (D1) and VDD, the lower end of the coil of the relay (K1) is connected with the positive pole of the diode (D1), the lower end of the coil of the relay (K2) and the positive pole of the diode (D2), the upper end of the coil of the relay (K2) is connected with the negative pole of the diode (D2) and VDD, the common contact of the relay (K2) is connected with the DSL communication module two, and the lower contact of the relay (K2) is connected with the Ethernet switch module.

8. The terminal camera network extension device for mine supporting bypass function of claim 7, wherein: The specific circuit of the Bypass control module comprises: MCU, triode (Q1) and resistors (R1), (R2) and (R3); The collector of the triode (Q1) is connected with the positive poles of the diodes (D1) and (D2), the emitter of the triode (Q1) is connected with the rear end of the resistor (R2) and the ground, the base of the triode is connected with the front end of the resistor (R1) and (R3), the rear end of the resistor (R1) is connected with the front end of the resistor (R2) and the MCU, and the MCU is connected with the Ethernet switch module and BT_VDD.

9. A method of using a terminal camera network extension device for mining with a bypass function as claimed in claim 8, characterized in that: The method comprises the following steps: S1. When the device power supply is abnormal or the power conversion circuit fails, VDD has no output, the common contact and the upper contact of the relays K1 and K2 are in contact, the DSL communication module one and the DSL communication module two are directly communicated without passing through the Ethernet switch module, the twisted pair interface performs signal amplification through the DSL communication module, the Ethernet switch module informs the MCU unit that the Ethernet works abnormally, and then the MCU controls the relay to output an alarm; S2. When the Ethernet switch module has a serious packet loss and VDD has a normal output, the Ethernet switch module informs the MCU in the Bypass control module that the Ethernet switch module communication is abnormal, then the MCU unit controls the triode (Q1) to be closed, the signal ground of the relays (K1) and (K2) is disconnected, the relays (K1) and (K2) are not in the working state, the common contact and the upper contact of the relays (K1) and (K2) are in contact, the DSL communication module one and the DSL communication module two are directly communicated without passing through the Ethernet switch module, the twisted pair interface performs signal amplification through the DSL communication module, the Ethernet switch module informs the MCU unit that the Ethernet works abnormally, and then the MCU controls the relay to output an alarm.

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