CN216851778U - Intrinsic safety protection circuit for mining Ethernet electric port - Google Patents
Intrinsic safety protection circuit for mining Ethernet electric port Download PDFInfo
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- CN216851778U CN216851778U CN202122254056.8U CN202122254056U CN216851778U CN 216851778 U CN216851778 U CN 216851778U CN 202122254056 U CN202122254056 U CN 202122254056U CN 216851778 U CN216851778 U CN 216851778U
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Abstract
The utility model relates to a colliery safety equipment field especially relates to a mining ethernet electric port intrinsic safety protection circuit, include: the safety barrier comprises a first electric port, a second electric port, a first fuse F1, a second fuse F2, a first safety barrier circuit, a second safety barrier circuit, a third safety barrier circuit, a fourth safety barrier circuit, a first current-limiting resistor R1, a second current-limiting resistor R2, a third current-limiting resistor R3 and a fourth current-limiting resistor R4, wherein the first safety barrier circuit, the second safety barrier circuit, the third safety barrier circuit and the fourth safety barrier circuit are all composed of a full-bridge rectifier circuit and a Zener diode, and the full-bridge rectifier circuit is electrically connected with the corresponding Zener diode. The safety barrier circuit is added on the receiving and sending ports of the Ethernet electric port, so that the voltage stabilization intrinsic safety effect is achieved, the influence of overvoltage of the electric port on an Ethernet intrinsic safety loop can be effectively inhibited, the intrinsic safety performance of the Ethernet electric port is guaranteed, and safety guarantee is provided for near-distance Ethernet electric port transmission of mine information data.
Description
Technical Field
The utility model relates to a colliery safety device field especially relates to a mining ethernet electric port intrinsic safety protection circuit.
Background
The coal mine comprehensive automation is the guarantee of high yield, high efficiency and safe production of a coal mine, and a coal mine underground network platform is the foundation for realizing the coal mine comprehensive automation. At present, industrial Ethernet is established in many coal mines in China and is used for monitoring underground coal mining equipment and underground environmental parameters; but mainly adopts a mixed network mode of hundred mega and giga (hundred mega downlink and giga uplink group ring). For long-distance information transmission, the Ethernet optical signal interface is mostly used for access, and for short-distance information transmission within 100m, the Ethernet electrical signal interface is mostly used for access. The coal mine underground Ethernet electric signals need to ensure intrinsic safety, so the underground switch needs to be subjected to intrinsic safety processing on the Ethernet electric port externally output, and the intrinsically safe signals are ensured to be externally output.
At present, a diode safety grid component is mostly adopted for intrinsically safe processing of a signal interface in an Ethernet switch and used between an intrinsically safe circuit and a non-intrinsically safe circuit as interface equipment, the diode safety grid component (shown as a figure I) is composed of a Zener diode, a current limiting resistor and a fuse, the diode is used for limiting voltage applied to the intrinsically safe circuit, the current limiting resistor is used for limiting current flowing into the intrinsically safe circuit, and in the application of a hundred-mega or giga-mega Ethernet electric port, a hundred-mega high-frequency signal is absorbed due to the parasitic capacitance of the Zener diode and the like, so that the data transmission in a short distance is influenced. Therefore, data transmission is not affected after the intrinsic safety processing, and the intrinsic safety protection of the power port of the industrial Ethernet ring network switch for the coal mine needs to be solved urgently.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: influence data transmission's technical problem after the protection in order to solve industrial ethernet ring network switch electric port for the colliery originally, the utility model provides a mining ethernet electric port this ampere of protection circuit through increase the guard grating circuit on the receipt of ethernet electric port and send the port, has played steady voltage this ampere of effect.
The utility model provides a technical scheme that its technical problem adopted is: a mining Ethernet electric port intrinsic safety protection circuit comprises: the circuit comprises a first electric port, a second electric port, a first fuse F1, a second fuse F2, a first safety barrier circuit, a second safety barrier circuit, a third safety barrier circuit, a fourth safety barrier circuit, a first current-limiting resistor R1, a second current-limiting resistor R2, a third current-limiting resistor R3 and a fourth current-limiting resistor R4; the RX1+ end of the first electric port is connected with the input a1 pin of the first safety barrier circuit, the pin a1 of the first safety barrier circuit is connected with the pin a2 of the second safety barrier circuit, the pin a2 of the second safety barrier circuit is connected with one end of a first current-limiting resistor R1 in series, and the other end of the first current-limiting resistor R1 is connected with the RX2+ end of the second electric port; the terminal of the first electrical port RX1 is connected in series with one terminal of the first fuse F1, the other terminal of the first fuse is connected to the pin b1 of the first barrier circuit, the pin b1 of the first barrier circuit is connected to the pin b2 of the second barrier circuit, the pin b2 of the second barrier circuit is connected in series with one terminal of the second current-limiting resistor R2, and the other terminal of the second current-limiting resistor R2 is connected to the terminal RX2 of the second electrical port; the terminal of the first electrical port TX1+ is connected to the pin a3 of the third safety barrier circuit, the pin a3 of the third safety barrier circuit is connected to the pin a4 of the fourth safety barrier circuit, the pin a4 of the fourth safety barrier circuit is connected in series to one terminal of a third current-limiting resistor R3, and the other terminal of the third current-limiting resistor R3 is connected to the terminal of the second electrical port TX2 +; the terminal of the first electrical port TX1 is connected in series with one terminal of a second fuse F2, the other terminal of the second fuse is connected with a pin b3 of the third safety barrier circuit, a pin b3 of the third safety barrier circuit is connected with a pin b4 of the fourth safety barrier circuit, a pin b4 of the fourth safety barrier circuit is connected in series with one terminal of a fourth current-limiting resistor R4, and the other terminal of the fourth current-limiting resistor R4 is connected with a terminal of a second electrical port TX 2; the first guard gate circuit, the second guard gate circuit, the third guard gate circuit and the fourth guard gate circuit are all composed of full-bridge rectifier circuits and Zener diodes, and the full-bridge rectifier circuits are electrically connected with the corresponding Zener diodes.
Further, specifically, the first safing gate circuit includes a first full-bridge rectifier circuit including a first diode D1, a second diode D2, a third diode D6 and a fourth diode D5, the cathode of the first diode D1 is connected to the cathode of the second diode D2, the anode of the third diode D6 is connected to the anode of the fourth diode D5, the anode of the first diode D1 is connected to the cathode of the fourth diode D5, the anode of the second diode D2 is connected to the cathode of the third diode D6, the connection point of the first diode D1 and the second diode D2 and the connection point of the fourth diode D5 and the third diode D6 serve as the output terminal and the output terminal of the first full-bridge rectifier circuit, respectively, the connection point of the first diode D1 and the fourth diode D5 is electrically connected to the first safing gate a1, the second diode D2 with the tie point of third diode D6 with first safety gate circuit b1 foot electricity is connected, the positive end of output and the negative pole electricity of first zener diode VD1 of first full-bridge rectifier circuit are connected, the negative end of output and the anodal electricity of first zener diode VD1 of first full-bridge rectifier circuit are connected.
Further, specifically, the second safing gate circuit includes a second full-bridge rectifier circuit, the second full-bridge rectifier circuit includes a fifth diode D3, a sixth diode D4, a seventh diode D8 and an eighth diode D7, the cathode of the fifth diode D3 is connected to the cathode of the sixth diode D4, the anode of the seventh diode D8 is connected to the anode of the eighth diode D7, the anode of the fifth diode D3 is connected to the cathode of the eighth diode D7, the anode of the sixth diode D4 is connected to the cathode of the seventh diode D8, the connection point of the fifth diode D3 and the sixth diode D4 and the connection point of the eighth diode D7 and the seventh diode D8 serve as the output terminal and the output terminal of the second full-bridge rectifier circuit, respectively, the connection point of the fifth diode D3 and the eighth diode D7 is electrically connected to the second safing gate pin 2, the sixth diode D4 with the connecting point of seventh diode D8 with second safety gate circuit b2 foot is connected electrically, the positive end of output and the second zener diode VD 2's negative pole of second full-bridge rectifier circuit are connected electrically, the negative end of output and the positive pole electricity of second zener diode VD2 of second full-bridge rectifier circuit are connected.
Further, specifically, the third safing gate circuit includes a third full-bridge rectifier circuit, the third full-bridge rectifier circuit includes a ninth diode D9, a twelfth diode D10, an eleventh diode D14 and a twelfth diode D13, the anode of the ninth diode D9 is connected to the anode of the twelfth diode D10, the cathode of the eleventh diode D14 is connected to the cathode of the twelfth diode D13, the cathode of the ninth diode D9 is connected to the anode of the twelfth diode D13, the cathode of the twelfth diode D10 is connected to the anode of the eleventh diode D14, the connection point of the ninth diode D9 and the twelfth diode D10 and the connection point of the twelfth diode D13 and the eleventh diode D14 serve as the output negative terminal and the output positive terminal of the third full-bridge rectifier circuit, respectively, the connection point of the ninth diode D9 and the twelfth diode D13 is electrically connected to the third safing gate circuit a3, the connection point of the twelfth diode D10 and the eleventh diode D14 is electrically connected to the pin of the third safety gate circuit b3, the positive output terminal of the third full-bridge rectifier circuit is electrically connected to the negative electrode of the third zener diode VD3, and the negative output terminal of the third full-bridge rectifier circuit is electrically connected to the positive electrode of the third zener diode VD 3.
Further, specifically, the fourth safety gate circuit includes a fourth full-bridge rectifier circuit, the fourth full-bridge rectifier circuit includes a thirteenth diode D11, a fourteenth diode D12, a fifteenth diode D16 and a sixteenth diode D15, the thirteenth diode D11 has an anode connected to the fourteenth diode D12, the fifteenth diode D16 has a cathode connected to the sixteenth diode D15, the thirteenth diode D11 has a cathode connected to the sixteenth diode D15, the fourteenth diode D12 has a cathode connected to the fifteenth diode D16, a connection point between the thirteenth diode D11 and the fourteenth diode D12 and a connection point between the sixteenth diode D15 and the fifteenth diode D16 are respectively used as an output negative terminal and an output positive terminal of the fourth full-bridge rectifier circuit, and a connection point between the thirteenth diode D11 and the sixteenth diode D15 and the fourth safety gate 4 is electrically connected to the pin The fourth diode D12 and the fifteenth diode D16 are electrically connected to pin b4, the positive output terminal of the fourth full-bridge rectifier circuit is electrically connected to the negative electrode of the fourth zener diode VD4, and the negative output terminal of the fourth full-bridge rectifier circuit is electrically connected to the positive electrode of the fourth zener diode VD 4.
Further, specifically, in order to impedance-match the differential signal lines of the protection circuit, it further includes: third fuse F3 and fourth fuse F4, first electric port RX1+ end with third fuse one end series connection is to first guard gate circuit a1 foot, first electric port TX1+ end with fourth fuse one end series connection is to third guard gate circuit a3 foot.
Further, specifically, the first fuse F1, the second fuse F2, the third fuse F3, and the fourth fuse F4 are all unrecoverable fuses.
The beneficial effects of the utility model are that, the utility model discloses a mining ethernet electric mouth this ampere of protection circuit through increase the guard grating circuit on the receipt of ethernet electric mouth and the transmission port, when overvoltage signal appears on the difference signal line of ethernet electric mouth, through guard grating circuit clamp, voltage on the difference signal line can be stabilized in clamp voltage department, has played the steady voltage this ampere of effect. Through the intrinsic safety processing of the Ethernet electric port, the influence of overvoltage of the electric port on an intrinsic safety loop of the Ethernet can be effectively restrained, the intrinsic safety performance of the Ethernet electric port is guaranteed, safety guarantee is provided for the short-distance Ethernet electric port transmission of mine information data, the requirements of national standard GB 3836.4 are met, and the method is applied to normal communication under the flammable and explosive environment of a coal mine.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a circuit diagram of a protection circuit of the prior art.
Fig. 2 is a preferred circuit diagram of the ethernet gigabit port protection circuit according to the present invention.
Fig. 3 is another preferred circuit diagram of the ethernet gigabit port protection circuit of the present invention.
Fig. 4 is a preferred circuit diagram of the ethernet gigabit port protection circuit of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic drawings, which illustrate the basic structure of the present invention in a schematic manner, and thus show only the components related to the present invention.
Example 1
As shown in fig. 2, it is the best embodiment of the present invention, a mining ethernet electric port intrinsic safety protection circuit, includes: the circuit comprises a first electric port, a second electric port, a first fuse F1, a second fuse F2, a first safety barrier circuit, a second safety barrier circuit, a third safety barrier circuit, a fourth safety barrier circuit, a first current-limiting resistor R1, a second current-limiting resistor R2, a third current-limiting resistor R3 and a fourth current-limiting resistor R4; the first electric port and the second electric port are Ethernet electric ports, which can be RJ-45 Ethernet electric ports and also can be Ethernet electric ports of other types. The first electric port and the second electric port respectively comprise a data receiving port and a data transmitting port, wherein the data receiving port of the first electric port consists of a data receiving positive terminal RX1+ terminal and a data receiving negative terminal RX 1-terminal, and the data transmitting port consists of a data transmitting positive terminal TX1+ terminal and a data transmitting negative terminal TX 1-terminal; the data receiving port of the second electric port consists of a data receiving positive terminal RX2+ terminal and a data receiving negative terminal RX 2-terminal, and the data transmitting port consists of a data transmitting positive terminal TX2+ terminal and a data transmitting negative terminal TX 2-terminal.
An RX1+ end of the first electric port is connected with an input a1 pin of the first safety barrier circuit, a1 pin of the first safety barrier circuit is connected with an input a2 pin of the second safety barrier circuit, a2 pin of the second safety barrier circuit is connected with one end of a first current-limiting resistor R1 in series, and the other end of the first current-limiting resistor R1 is connected with an R2X + end of the second electric port; the end of a first electric port RX 1-is connected with one end of a first fuse wire F1 in series, the other end of the first fuse wire is connected with a pin b1 of a first safety gate circuit, a pin b1 of the first safety gate circuit is connected with a pin b2 of a second safety gate circuit, a pin b2 of the second safety gate circuit is connected with one end of a second current-limiting resistor R2 in series, and the other end of the second current-limiting resistor R2 is connected with the end of a second electric port RX 2-in series; the terminal of a first electric port TX1+ is connected with a pin a3 of a third safety barrier circuit input, a pin a3 of the third safety barrier circuit is connected with a pin a4 of a fourth safety barrier circuit input, a pin 4 of the fourth safety barrier circuit is connected with one end of a third current-limiting resistor R3 in series, and the other end of the third current-limiting resistor R3 is connected with the terminal of a second electric port TX2 +; the end of a first electric port TX1 is connected with one end of a second fuse F2 in series, the other end of the second fuse is connected with a pin b3 of a third safety barrier circuit, a pin b3 of the third safety barrier circuit is connected with a pin b4 of a fourth safety barrier circuit, a pin b4 of the fourth safety barrier circuit is connected with one end of a fourth current-limiting resistor R4 in series, and the other end of the fourth current-limiting resistor R4 is connected with the end of a second electric port TX2 in series; the first guard gate circuit, the second guard gate circuit, the third guard gate circuit and the fourth guard gate circuit are all composed of a full-bridge rectifier circuit and a Zener diode, and the full-bridge rectifier circuit is electrically connected with the corresponding Zener diode.
The first safety gate circuit comprises a first full-bridge rectification circuit, the first full-bridge rectification circuit comprises a first diode D1, a second diode D2, a third diode D6 and a fourth diode D5, the cathode of the first diode D1 is connected with the cathode of a second diode D2, the anode of the third diode D6 is connected with the anode of a fourth diode D5, the anode of the first diode D1 is connected with the cathode of the fourth diode D5, the anode of the second diode D2 is connected with the cathode of a third diode D6, the connection point of the first diode D1 and the second diode D2 and the connection point of the fourth diode D5 and the third diode D6 are respectively used as the output positive terminal and the output negative terminal of the first full-bridge rectification circuit, the connection point of the first diode D1 and the fourth diode D5 is electrically connected with a pin 1 of the first safety gate circuit, the connection point of the second diode D2 and the third diode D6 is electrically connected with a pin 1 of the first safety gate circuit, the positive output end of the first full-bridge rectification circuit is electrically connected with the negative electrode of the first zener diode VD1, and the negative output end of the first full-bridge rectification circuit is electrically connected with the positive electrode of the first zener diode VD 1.
The second safety gate circuit comprises a second full-bridge rectification circuit, the second full-bridge rectification circuit comprises a fifth diode D3, a sixth diode D4, a seventh diode D8 and an eighth diode D7, the cathode of the fifth diode D3 is connected with the cathode of a sixth diode D4, the anode of the seventh diode D8 is connected with the anode of an eighth diode D7, the anode of the fifth diode D3 is connected with the cathode of the eighth diode D7, the anode of the sixth diode D4 is connected with the cathode of a seventh diode D8, the connection point of the fifth diode D3 and the sixth diode D4 and the connection point of the eighth diode D7 and the seventh diode D8 are respectively used as the output positive terminal and the output negative terminal of the second full-bridge rectification circuit, the connection point of the fifth diode D3 and the eighth diode D7 is electrically connected with a pin 2 of the second safety gate circuit, the connection point of the sixth diode D4 and the seventh diode D8 is electrically connected with a pin 2 of the second safety gate circuit, the positive output end of the second full-bridge rectification circuit is electrically connected with the negative electrode of a second Zener diode VD2, and the negative output end of the second full-bridge rectification circuit is electrically connected with the positive electrode of a second Zener diode VD 2.
The third safety gate circuit comprises a third full-bridge rectification circuit, the third full-bridge rectification circuit comprises a ninth diode D9, a twelfth diode D10, an eleventh diode D14 and a twelfth diode D13, the anode of the ninth diode D9 is connected with the anode of the twelfth diode D10, the cathode of the eleventh diode D14 is connected with the cathode of the twelfth diode D13, the cathode of the ninth diode D9 is connected with the anode of the twelfth diode D13, the cathode of the twelfth diode D10 is connected with the anode of the eleventh diode D14, the connection point of the ninth diode D9 and the twelfth diode D10 and the connection point of the twelfth diode D13 and the eleventh diode D14 are respectively used as the output negative terminal and the output positive terminal of the third full-bridge rectification circuit, the connection point of the ninth diode D9 and the twelfth diode D13 is electrically connected with the third safety gate circuit a3 pin, the connection point of the twelfth diode D10 and the eleventh diode D14 is electrically connected with the third safety gate circuit b3 pin, the positive output end of the third full-bridge rectification circuit is electrically connected with the negative electrode of a third Zener diode VD3, and the negative output end of the third full-bridge rectification circuit is electrically connected with the positive electrode of a third Zener diode VD 3.
The fourth safety gate circuit comprises a fourth full-bridge rectification circuit, the fourth full-bridge rectification circuit comprises a thirteenth diode D11, a fourteenth diode D12, a fifteenth diode D16 and a sixteenth diode D15, the anode of the thirteenth diode D11 is connected with the anode of the fourteenth diode D12, the cathode of the fifteenth diode D16 is connected with the cathode of the sixteenth diode D15, the cathode of the thirteenth diode D11 is connected with the anode of the sixteenth diode D15, the cathode of the fourteenth diode D12 is connected with the anode of the fifteenth diode D16, the connection point of the thirteenth diode D11 and the fourteenth diode D12 and the connection point of the sixteenth diode D15 and the fifteenth diode D16 are respectively used as the output negative terminal and the output positive terminal of the fourth full-bridge rectification circuit, the connection point of the thirteenth diode D11 and the sixteenth diode D15 is electrically connected with the fourth safety gate circuit a4 pin, the connection point of the fourteenth diode D12 and the fifteenth diode 16 is electrically connected with the fourth safety gate circuit b4 pin, the positive output end of the fourth full-bridge rectification circuit is electrically connected with the negative electrode of a fourth Zener diode VD4, and the negative output end of the fourth full-bridge rectification circuit is electrically connected with the positive electrode of a fourth Zener diode VD 4.
In an embodiment of the present invention, the first fuse F1 and the second fuse F2 used are both non-recoverable fuses.
The embodiment of the utility model provides an in, 2 grades of safety barrier circuit (first safety barrier circuit and second safety barrier circuit) have been connected between the receiving port of first electric mouth receiving port and second electric mouth, have connected 2 grades of safety barrier circuit (third safety barrier circuit and fourth safety barrier circuit) between the sending port of first electric mouth sending port and second electric mouth, when one of them grade of safety barrier circuit trouble or when out of work, another safety barrier circuit can continue to work, has improved protection circuit's security. The Ethernet port data receiving port and the data sending port transmit differential signals, and when overvoltage signals on the differential signal line approach a clamping voltage (the clamping voltage is the sum of voltage drops of a Zener diode and a full-bridge rectifier circuit), the safety gate circuit works, so that the voltage on the differential signal line is always kept below a safe clamping voltage value, and a voltage stabilizing effect is achieved; the current limiting resistor is used for limiting current, and limiting the current on the differential signal line below a safe current limiting value, so that a current limiting effect is achieved; when overvoltage signals on the differential signal lines are increased, currents reserved on the safety grids are correspondingly increased, and when the currents reach fusing currents of the fuse wire, the fusing currents are broken, and the intrinsic safety protection effect is achieved.
Example 2
As shown in fig. 3, in order to match impedances on differential signal lines of the protection circuit, on the basis of embodiment 1, the ethernet port intrinsic safety protection circuit for mining further includes a third fuse F3 and a fourth fuse F4, a first port RX1+ terminal and a third fuse terminal are connected in series to a pin of a first safety gate circuit a1, and a first port TX1+ terminal and a fourth fuse terminal are connected in series to a pin of a third safety gate circuit a 3.
In an embodiment of the present invention, the first fuse F1, the second fuse F2, the third fuse F3 and the fourth fuse F4 used are non-recoverable fuses.
Example 3
According to the used environment difference of mining ethernet electric port intrinsic safety protection circuit, if use on hundred megateriums ethernet switch or on the ethernet switch of giga level, choose for use the utility model discloses a mining ethernet electric port intrinsic safety protection circuit's quantity is different, for the use on the ethernet switch of giga level in embodiment 3, adopts two the utility model discloses a mining ethernet electric port intrinsic safety protection circuit specifically as shown in fig. 4.
The embodiment of the utility model provides an in, ethernet port data reception port and data transmission port transmission difference signal, overvoltage signal appears when this difference signal line is transmitted, through the guard grating circuit clamp, voltage on the difference signal line can be stabilized in clamp voltage department, wherein clamp voltage is the sum of zener diode steady voltage and full bridge type diode voltage drop, along with the increase of overvoltage signal on the difference signal line, the electric current that flows through the guard grating circuit is also big more, when the difference signal line electric current reaches unrecoverable fuse fusing current, the fuse breaks, the effect of intrinsic safety protection has been played. When an overvoltage signal appears on the differential signal line to reach the overvoltage range of the overvoltage value required by fusing of the fuse wire, the voltage difference on the differential signal line can be stabilized at the position of the clamping voltage, and the voltage stabilizing effect is achieved. The current limiting resistor is used for limiting current, and limiting the current on the differential signal wire below a safe current limiting value, so that a current limiting effect is achieved. The mining Ethernet electric port intrinsic safety protection circuit provided by the embodiment of the invention can effectively inhibit the influence of electric port overvoltage on an Ethernet intrinsic safety loop through intrinsic safety processing on the Ethernet electric port, ensures the intrinsic safety performance of the Ethernet electric port, provides safety guarantee for near-distance Ethernet electric port transmission of mine information data, meets the requirements of national standard GB 3836.4, and is applied to normal communication in an underground coal mine flammable and explosive environment.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the description, and must be determined according to the scope of the claims.
Claims (7)
1. The utility model provides a mining ethernet electric port intrinsic safety protection circuit which characterized in that: the method comprises the following steps: the circuit comprises a first electric port, a second electric port, a first fuse F1, a second fuse F2, a first safety barrier circuit, a second safety barrier circuit, a third safety barrier circuit, a fourth safety barrier circuit, a first current-limiting resistor R1, a second current-limiting resistor R2, a third current-limiting resistor R3 and a fourth current-limiting resistor R4;
the RX1+ end of the first electric port is connected with the input a1 pin of the first safety barrier circuit, the pin a1 of the first safety barrier circuit is connected with the pin a2 of the second safety barrier circuit, the pin a2 of the second safety barrier circuit is connected with one end of a first current-limiting resistor R1 in series, and the other end of the first current-limiting resistor R1 is connected with the RX2+ end of the second electric port;
the terminal of the first electrical port RX1 is connected in series with one terminal of the first fuse F1, the other terminal of the first fuse is connected to the pin b1 of the first barrier circuit, the pin b1 of the first barrier circuit is connected to the pin b2 of the second barrier circuit, the pin b2 of the second barrier circuit is connected in series with one terminal of the second current-limiting resistor R2, and the other terminal of the second current-limiting resistor R2 is connected to the terminal RX2 of the second electrical port;
the terminal of the first electrical port TX1+ is connected to the pin a3 of the third safety barrier circuit, the pin a3 of the third safety barrier circuit is connected to the pin a4 of the fourth safety barrier circuit, the pin a4 of the fourth safety barrier circuit is connected in series to one terminal of a third current-limiting resistor R3, and the other terminal of the third current-limiting resistor R3 is connected to the terminal of the second electrical port TX2 +;
the terminal of the first electrical port TX1 is connected in series with one terminal of a second fuse F2, the other terminal of the second fuse is connected with a pin b3 of the third safety barrier circuit, a pin b3 of the third safety barrier circuit is connected with a pin b4 of the fourth safety barrier circuit, a pin b4 of the fourth safety barrier circuit is connected in series with one terminal of a fourth current-limiting resistor R4, and the other terminal of the fourth current-limiting resistor R4 is connected with a terminal of a second electrical port TX 2;
the first guard gate circuit, the second guard gate circuit, the third guard gate circuit and the fourth guard gate circuit are all composed of full-bridge rectifier circuits and Zener diodes, and the full-bridge rectifier circuits are electrically connected with the corresponding Zener diodes.
2. The mining ethernet port intrinsic safety protection circuit of claim 1, wherein: the first safety gate circuit comprises a first full-bridge rectification circuit, the first full-bridge rectification circuit comprises a first diode D1, a second diode D2, a third diode D6 and a fourth diode D5, the cathode of the first diode D1 is connected with the cathode of the second diode D2, the anode of the third diode D6 is connected with the anode of the fourth diode D5, the anode of the first diode D1 is connected with the cathode of the fourth diode D5, the anode of the second diode D2 is connected with the cathode of the third diode D6, the connection point of the first diode D1 and the second diode D2 and the connection point of the fourth diode D5 and the third diode D6 are respectively used as the positive output terminal and the negative output terminal of the first full-bridge rectification circuit, the gate connection point of the first diode D1 and the fourth diode D5 is electrically connected with the pin of the first safety gate a1, the second diode D2 with the tie point of third diode D6 with first safety gate circuit b1 foot electricity is connected, the positive end of output and the negative pole electricity of first zener diode VD1 of first full-bridge rectifier circuit are connected, the negative end of output and the anodal electricity of first zener diode VD1 of first full-bridge rectifier circuit are connected.
3. The mining ethernet port intrinsic safety protection circuit of claim 1, wherein: the second safety gate circuit comprises a second full-bridge rectification circuit, the second full-bridge rectification circuit comprises a fifth diode D3, a sixth diode D4, a seventh diode D8 and an eighth diode D7, the cathode of the fifth diode D3 is connected with the cathode of the sixth diode D4, the anode of the seventh diode D8 is connected with the anode of the eighth diode D7, the anode of the fifth diode D3 is connected with the cathode of the eighth diode D7, the anode of the sixth diode D4 is connected with the cathode of the seventh diode D8, the connection point of the fifth diode D3 and the sixth diode D4 and the connection point of the eighth diode D7 and the seventh diode D8 are respectively used as the positive output terminal and the negative output terminal of the second full-bridge rectification circuit, the gate connection point of the fifth diode D3 and the eighth diode D7 is electrically connected with the pin of the second safety gate a2, the sixth diode D4 with the connecting point of seventh diode D8 with second safety gate circuit b2 foot is connected electrically, the positive end of output and the second zener diode VD 2's negative pole of second full-bridge rectifier circuit are connected electrically, the negative end of output and the positive pole electricity of second zener diode VD2 of second full-bridge rectifier circuit are connected.
4. The mining ethernet port intrinsic safety protection circuit of claim 1, wherein: the third safety gate circuit comprises a third full-bridge rectification circuit, the third full-bridge rectification circuit comprises a ninth diode D9, a twelfth diode D10, an eleventh diode D14 and a twelfth diode D13, the anode of the ninth diode D9 is connected with the anode of the twelfth diode D10, the cathode of the eleventh diode D14 is connected with the cathode of the twelfth diode D13, the cathode of the ninth diode D9 is connected with the anode of the twelfth diode D13, the cathode of the twelfth diode D10 is connected with the anode of the eleventh diode D14, the connection point of the ninth diode D9 and the twelfth diode D10 and the connection point of the twelfth diode D13 and the eleventh diode D14 are respectively used as the output negative terminal and the output positive terminal of the third full-bridge rectification circuit, and the connection point of the ninth diode D9 and the twelfth diode D13 is electrically connected with the third safety gate a3, the connection point of the twelfth diode D10 and the eleventh diode D14 is electrically connected to the pin of the third safety gate circuit b3, the positive output terminal of the third full-bridge rectifier circuit is electrically connected to the negative electrode of the third zener diode VD3, and the negative output terminal of the third full-bridge rectifier circuit is electrically connected to the positive electrode of the third zener diode VD 3.
5. The mining ethernet port intrinsic safety protection circuit of claim 1, wherein: the fourth safety gate circuit comprises a fourth full-bridge rectification circuit, the fourth full-bridge rectification circuit comprises a thirteenth diode D11, a fourteenth diode D12, a fifteenth diode D16 and a sixteenth diode D15, the anode of the thirteenth diode D11 is connected with the anode of the fourteenth diode D12, the cathode of the fifteenth diode D16 is connected with the cathode of the sixteenth diode D15, the cathode of the thirteenth diode D11 is connected with the anode of the sixteenth diode D15, the cathode of the fourteenth diode D12 is connected with the anode of the fifteenth diode D16, the connection point of the thirteenth diode D11 and the fourteenth diode D12 and the connection point of the sixteenth diode D15 and the fifteenth diode D16 serve as the negative output terminal and the positive output terminal of the fourth full-bridge rectification circuit respectively, and the connection point of the thirteenth diode D11 and the sixteenth diode D15 is electrically connected with the pin of the fourth safety gate circuit a4 and the fourteenth diode D12 is electrically connected with the pin of the fourth safety gate circuit a4 The connection point of the fifteenth diode D16 is electrically connected with the pin of a fourth safety gate circuit b4, the positive output terminal of the fourth full-bridge rectification circuit is electrically connected with the negative electrode of a fourth zener diode VD4, and the negative output terminal of the fourth full-bridge rectification circuit is electrically connected with the positive electrode of the fourth zener diode VD 4.
6. The mining ethernet port intrinsic safety protection circuit of claim 1, wherein: further comprising: a third fuse F3 and a fourth fuse F4, the first electrical port RX1+ end and one end of the third fuse are connected in series to a pin of a first safety barrier circuit a1, and the first electrical port TX1+ end and one end of the fourth fuse are connected in series to a pin of a third safety barrier circuit a 3.
7. The Ethernet for mining electric port intrinsic safety protection circuit of claim 1 or 6, wherein: the first fuse wire F1, the second fuse wire F2, the third fuse wire F3 and the fourth fuse wire F4 are all non-recoverable fuse wires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122254056.8U CN216851778U (en) | 2021-09-17 | 2021-09-17 | Intrinsic safety protection circuit for mining Ethernet electric port |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122254056.8U CN216851778U (en) | 2021-09-17 | 2021-09-17 | Intrinsic safety protection circuit for mining Ethernet electric port |
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| Publication Number | Publication Date |
|---|---|
| CN216851778U true CN216851778U (en) | 2022-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122254056.8U Active CN216851778U (en) | 2021-09-17 | 2021-09-17 | Intrinsic safety protection circuit for mining Ethernet electric port |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216851778U (en) |
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2021
- 2021-09-17 CN CN202122254056.8U patent/CN216851778U/en active Active
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