CN220440697U - Non-safety intrinsic safety signal switching equipment and system - Google Patents
Non-safety intrinsic safety signal switching equipment and system Download PDFInfo
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- CN220440697U CN220440697U CN202322102075.8U CN202322102075U CN220440697U CN 220440697 U CN220440697 U CN 220440697U CN 202322102075 U CN202322102075 U CN 202322102075U CN 220440697 U CN220440697 U CN 220440697U
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- 238000002955 isolation Methods 0.000 claims abstract description 53
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- 239000003990 capacitor Substances 0.000 claims description 25
- 230000002457 bidirectional effect Effects 0.000 claims description 22
- 238000012546 transfer Methods 0.000 claims description 9
- 239000000872 buffer Substances 0.000 description 15
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Abstract
The utility model discloses a non-safety intrinsic safety signal switching device and a system, wherein the non-An Benan signal switching device comprises a controller; the signal output port of the controller is connected with the first driving circuit through the isolation circuit; the signal input port of the controller is connected with the second driving circuit; the reset port of the controller is connected with the peripheral control circuit; the first driving circuit comprises a first driving chip, an output port of the first driving chip is connected with a first wiring terminal, an input port of the first driving chip is connected with the isolation circuit, and the first wiring terminal is used for being connected with the local equipment; the second driving circuit comprises a second driving chip, an input port of the second driving chip is connected with a signal input port of the controller, an output port of the second driving chip is connected with a second wiring terminal, and the second wiring terminal is used for being connected with non-installation equipment. CAN convert the CAN signal that non-installation equipment output into the CAN signal that satisfies the requirement of this safety equipment.
Description
Technical Field
The utility model relates to the technical field of intrinsic safety conversion, in particular to non-intrinsic safety signal switching equipment and system.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The CAN bus protocol is born in the automobile industry in the 80 th century of 20, and is widely applied to various fields due to the factors of high reliability, stability and the like. As a serial communication network for distributed control, the method has wider application in the coal industry.
The electric equipment is limited by the underground application environment of the coal mine, and the electric equipment must meet the related requirements of explosion prevention or intrinsic safety and acquire related qualification to be applied to the underground coal mine. Meanwhile, signals of communication, control and the like in different explosion-proof forms cannot be directly connected. The CAN signal is used as one of control signals which are widely applied in underground coal mines, and most of equipment with CAN signal interfaces is intrinsic safety equipment or interfaces which meet the intrinsic safety design requirements. Therefore, non-installation devices like PLCs, conventional industrial switches, etc. want to connect the CAN signal of the mine down-hole intrinsic safety device down-hole, and must convert the CAN signal that does not meet the intrinsic safety requirement into a CAN signal that meets the intrinsic safety requirement.
Disclosure of Invention
In order to solve the problems, the utility model provides non-safety signal switching equipment and a system, which CAN convert CAN signals output by the non-safety equipment into CAN signals meeting the requirement of safety.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
in a first aspect, a non-intrinsic safety signal switching device is provided, including a controller; the signal output port of the controller is connected with the first driving circuit through the isolation circuit; the signal input port of the controller is connected with the second driving circuit; the reset port of the controller is connected with the peripheral control circuit;
the first driving circuit comprises a first driving chip, an output port of the first driving chip is connected with a first wiring terminal, an input port of the first driving chip is connected with the isolation circuit, and the first wiring terminal is used for being connected with the local equipment;
the second driving circuit comprises a second driving chip, an input port of the second driving chip is connected with a signal input port of the controller, an output port of the second driving chip is connected with a second wiring terminal, and the second wiring terminal is used for being connected with non-installation equipment.
Further, a bidirectional clamping tube is connected between the two output ports of the second driving chip and a connecting circuit of the second wiring terminal.
Further, the controller is also connected with a dial switch.
Further, a first output port of the first driving chip is connected with the first wiring terminal through a first circuit, a second output port of the first driving chip is connected with the first wiring terminal through a second circuit, and fuses are connected in series on the first circuit and the second circuit; a dial switch and a bidirectional clamping tube are connected between the first circuit and the second circuit, and the dial switch and the bidirectional clamping tube are connected in parallel; the two input ports of the first driving chip are respectively connected with the controller through the isolating circuit.
Further, two bidirectional clamping tubes are connected between the first circuit and the second circuit of the first driving chip; the two bidirectional clamping pipes are connected in parallel and are connected in parallel with the dial switch.
Further, the isolation circuit comprises a first isolation circuit and a second isolation circuit; the first isolation circuit and the second isolation circuit both comprise signal isolators, the input port of the signal isolators of the first isolation circuit is connected with the controller, the output port of the signal isolators of the first isolation circuit is connected with the first driving circuit, the output port of the signal isolators of the second isolation circuit is connected with the controller, and the input port of the signal isolators of the second isolation circuit is connected with the first driving circuit.
Further, a second resistor is connected in series between the input port of the signal isolator of the first isolation circuit and the connection circuit of the controller, and between the input port of the signal isolator of the second isolation circuit and the connection circuit of the first driving circuit.
Further, the output ports of the signal isolators of the first isolation circuit and the second isolation circuit are connected with the cathode of the first diode and the first end of the second capacitor, and the anode of the first diode and the second end of the second capacitor are grounded.
Further, enabling ends of signal isolators of the first isolation circuit and the second isolation circuit are connected with a first end of a third resistor, and a second end of the third resistor is connected with a first end of a fourth resistor and a first end of a first capacitor; the second end of the fourth resistor is connected with the first end of the second capacitor, and the second end of the first capacitor is grounded.
In a second aspect, a non-intrinsic safety signal switching system is provided, which includes a non-intrinsic safety signal switching device provided in the first aspect.
Compared with the prior art, the utility model has the beneficial effects that:
1. according to the utility model, the CAN signal output by the non-installation equipment CAN be input to the controller by arranging the second driving circuit, the peripheral control circuit CAN enable the controller to work normally, the controller is also connected with the first driving circuit through the isolating circuit, and data output by the controller CAN enter the first driving circuit through the isolating circuit, so that the CAN signal meeting the requirement of the intrinsic safety equipment is output through the first driving circuit, and the conversion of the CAN signal between the non-installation equipment and the intrinsic installation equipment is realized.
Additional aspects of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application.
FIG. 1 is an overall circuit diagram of the apparatus disclosed in example 1;
FIG. 2 is an electrical block diagram of the apparatus disclosed in example 1;
FIG. 3 is a circuit diagram of the controller connections of the apparatus disclosed in example 1;
fig. 4 is a diagram showing an isolation circuit and a first driving circuit of the apparatus disclosed in embodiment 1.
The specific embodiment is as follows:
the utility model will be further described with reference to the drawings and examples.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
Example 1
In this embodiment, a non-intrinsic safety signal transfer device is disclosed, as shown in fig. 1 to 4, including a controller N3; the signal output port of the controller is connected with the first driving circuit through the isolation circuit; the signal input port of the controller is connected with the second driving circuit; the reset port of the controller is connected with the peripheral control circuit;
the first driving circuit comprises a first driving chip, an output port of the first driving chip is connected with a first wiring terminal, an input port of the first driving chip is connected with the isolation circuit, and the first wiring terminal is used for being connected with the local equipment;
the second driving circuit comprises a second driving chip N2, an input port of the second driving chip is connected with a signal input port of the controller, an output port of the second driving chip is connected with a second wiring terminal XS1, and the second wiring terminal is used for being connected with non-installation equipment.
In a specific implementation, the controller N3 selects a microcontroller with a model number of LPC2119FBD64, and as shown in fig. 3, the pin 3 and the pin 5 of the controller are a signal input port RD2 and a signal input port TD2 respectively; the pin 9 and the pin 10 of the controller are a signal output port RD1 and a signal output port TD1 respectively; the pins 58 and 21 of the controller are the reset port REST and the reset port TRST, respectively.
The second driving circuit comprises a second driving chip, an input port of the second driving chip is connected with a signal input port of the controller, an output port of the second driving chip is connected with a second wiring terminal, the second wiring terminal is used for being connected with non-installation equipment, and through the second driving circuit, differential signals output by the non-installation equipment can be converted into TTL level signals, and then the TTL level signals are connected into the controller.
And a bidirectional clamping tube is connected between the two output ports of the second driving chip and a connecting circuit of the second wiring terminal.
Preferably, the second connection terminal is a KF2EDGR-2P connection terminal, the second driving chip is a MCP2551 chip, a pin 1 and a pin 4 of the MCP2551 chip are respectively an input port TXD and an input port RXD, and a pin 6 and a pin 7 of the MCP2551 chip are respectively an output port CANL and an output port CANH.
The input port TXD of the second driving chip is connected to the signal input port TD2 of the controller, and the input port RXD of the second driving chip is connected to the signal input port RD2 of the controller.
The output port CANL of the second driving chip is connected with the second port of the second wiring terminal through a first wire, the output port CANH of the second driving chip is connected with the first port of the second wiring terminal through a second wire, and a bidirectional clamping tube V1 is connected between the first wire and the second wire.
The peripheral control circuit is used for controlling the controller to work normally, the peripheral control circuit comprises a peripheral control chip N1, the signal output end of the peripheral control chip is connected with a first buffer N8.1 and a second buffer N9.2, the first buffer N8.1 is connected with a reset port REST, and the second buffer N9.2 is connected with the reset port TRST.
Preferably, the external control chip selects a MAX708S chip, and a pin 7 of the MAX708S chip is a signal output end REST. The first buffer and the second buffer are 74HC125D buffers.
The signal output end REST is connected with the output permission control terminal of the first buffer 8.1, the output permission control end of the second buffer N9.2 and the first end of the resistor R3, the second end of the resistor R3 is connected with the data input end of the second buffer N9.2, the data output end of the first buffer 8.1 is respectively connected with the first end of the resistor R2 and the reset port REST, the data output end of the second buffer N9.2 is respectively connected with the first end of the resistor R6 and the reset port TRST, and the second end of the resistor R2 and the second end of the resistor R6 are both connected with a power supply. The second terminal of the resistor R3 is connected to the data input of the second buffer N9.2, and the data input of the first buffer 8.1 and the data input of the second buffer N9.2 are both grounded.
In order to adjust the baud rate of the CAN signal received by the controller, the present embodiment also connects the controller to the dial switch.
Preferably, the dial switch is a DSIC04XXGET dial switch, and pins 1, 2, 3 and 4 of the DSIC04XXGET dial switch are respectively connected with pins 37, 35, 34 and 33 of the controller through connecting wires. Pins 5, 6, 7 and 8 of the dip switch are all connected to ground.
Pins 37, 35, 34 and 33 of the controller are CAP1.1 port, CAP1.0 port, EINT3 port and PWM4 port, respectively. The four ports are used here as signal inputs for detecting the status of the dip switch.
Each connecting wire is also connected with a resistor, and the other end of the resistor is connected with a power supply.
As shown in fig. 4, the first driving circuit includes a first driving chip N4, an output port of the first driving chip N4 is connected with a first connection terminal XS3, an input port of the first driving chip is connected with the isolation circuit, and the first connection terminal is used for being connected with the local device.
The first output port of the first driving chip is connected with the first input port of the first wiring terminal through a first circuit, the second output port of the first driving chip is connected with the second input port of the first wiring terminal through a second circuit, and fuses are connected in series on the first circuit and the second circuit; a dial switch and a bidirectional clamping tube are connected between the first circuit and the second circuit, and the dial switch and the bidirectional clamping tube are connected in parallel; the two input ports of the first driving chip are respectively connected with the controller through the isolating circuit.
The isolation circuit comprises a first isolation circuit and a second isolation circuit; the first isolation circuit and the second isolation circuit both comprise signal isolators, the input port of the signal isolators of the first isolation circuit is connected with the controller, the output port of the signal isolators of the first isolation circuit is connected with the first driving circuit, the output port of the signal isolators of the second isolation circuit is connected with the controller, and the input port of the signal isolators of the second isolation circuit is connected with the first driving circuit.
The input port of the signal isolator of the first isolation circuit is connected with the connecting circuit of the controller in series with the second resistor.
The output ports of the signal isolators of the first isolation circuit and the second isolation circuit are connected with the cathode of the first diode and the first end of the second capacitor, and the anode of the first diode and the second end of the second capacitor are grounded.
The enabling ends of the signal isolators of the first isolation circuit and the second isolation circuit are connected with the first end of the third resistor, and the second end of the third resistor is connected with the first end of the fourth resistor and the first end of the first capacitor; the second end of the fourth resistor is connected with the first end of the second capacitor, and the second end of the first capacitor is grounded.
Preferably, the first driving chip N4 selects MCP2551, the first wiring terminal XS3 selects KF2EDGR-2P wiring terminal, the signal isolator selects EL6N137 optocoupler isolator, the highest speed of the EL6N137 can reach 10Mbit/s, and the maximum transient isolation voltage Viso between input and output is 5000V rms. Pins 6 and 7 of the first driving chip are a first output port CANL and a second output port CANH of the chip, respectively, and pins 1 and 4 are an input port TXD and an input port RXD of the chip, respectively.
The KF2EDGR-2P wiring terminal comprises a first input port 2 and a second input port 1.
Pin 6 of the EL6N137 optocoupler isolator is the output port VO of the isolator; pin 7 is the enable port EN of the isolator; pins 2 and 3 are the input port V + and input port V-of the isolator, respectively.
The first output port CANL is connected to the first input port 2 of the first connection terminal via the first circuit, and the second output port CANH of the first driving chip is connected to the second input port 1 of the first connection terminal via the second circuit.
The first circuit is connected with a fuse F1 in series, the second circuit is connected with a fuse F2 in series, a dial switch S2 and a bidirectional clamping tube V6 are connected between the first circuit and the second circuit, and the dial switch S2 and the bidirectional clamping tube V6 are connected in parallel; the dial switch S2 is also connected with a resistor R22 in series, one end of the dial switch S2 is connected with the first circuit after being connected with the resistor R22 in series, and the other end of the dial switch S2 is connected with the second circuit. In order to realize bidirectional protection, a bidirectional clamping tube V7 is also connected between the first circuit and the second circuit, one ends of the bidirectional clamping tube V7 and the bidirectional clamping tube V6 are connected with the first circuit, and the other ends are connected with the second circuit; namely, the bidirectional clamping tube V7, the bidirectional clamping tube V6 and the dial switch S2 are connected in parallel.
The input port V-of the signal isolator N6 is connected to the output port TD1 of the controller N3, and a second resistor R16 is connected in series to the connection circuit.
The output port VO of the signal isolator N6 is connected to the input port TXD of the first driving chip, in addition, the output port VO of the signal isolator N6 is further connected to the cathode of the first diode V10 and the first end of the second capacitor C17, both the anode of the first diode V10 and the second end of the second capacitor C17 are grounded, the enable port EN of the signal isolator N6 is connected to the first end of the third resistor R18, the second end of the third resistor R18 is connected to the first end of the fourth resistor R20 and the first end of the first capacitor C16, the second end of the fourth resistor R20 is connected to the first end of the second capacitor C17, and the second end of the first capacitor C16 is grounded.
The input port v+ of the signal isolator N6 is connected to the cathodes of the second diode V4 and the third diode V5 and the first end of the fifth resistor R15, the anodes of the second diode V4 and the third diode V5 are grounded, and the second end of the fifth resistor R15 is connected to the power supply.
The input port V-of the signal isolator N7 is connected to the input port RXD of the first driver chip, and a second resistor R19 is connected in series to the connection circuit.
The output port VO of the signal isolator N7 is connected to the output port RD1 of the controller N3, in addition, the output port VO of the signal isolator N7 is further connected to the cathode of the first diode V3 and the first end of the second capacitor C13, both the anode of the first diode V3 and the second end of the second capacitor C13 are grounded, the enable port EN of the signal isolator N7 is connected to the first end of the third resistor R17, the second end of the third resistor R17 is connected to the first end of the fourth resistor R13 and the first end of the first capacitor C15, the second end of the fourth resistor R13 is connected to the first end of the second capacitor C13, and the second end of the first capacitor C15 is grounded.
The input port V+ of the signal isolator N7 is connected with the cathodes of the second diode V8 and the third diode V9 and the first end of the fifth resistor R21, the anodes of the second diode V8 and the third diode V9 are grounded, and the second end of the fifth resistor R21 is connected with the power supply voltage VDD-B.
Preferably, the power supply is 3.3V, the first diode is a 6.2V zener diode, and the second diode is a 4.7V zener diode.
Taking the signal isolator N6 as an example, the input port V+ of the optocoupler isolator is limited by two 4.7V voltage stabilizing diodes V4 and V5, when the voltage of a 3.3V power supply suddenly rises due to faults, the two voltage stabilizing diodes can clamp the voltage to be not more than 4.89V (considering the parameter offset of the diodes and calculated according to 5 percent), and the voltage is not more than the supply voltage VDD-B of the coupler 5V, thereby meeting the requirement that the starting voltage of the optocoupler isolator is not more than 500 mV. When the power supply fails and rises, the voltage of 3.3V is up to 4.89V, the input end VF of the optocoupler isolator is=1.4V, and the current IF= (4.89V-VF)/(R15+R16) =5.54 mA flowing through the optocoupler isolator is far lower than 50mA required by the optocoupler isolator. Therefore, by the arrangement of the second diode, the optocoupler isolator can work normally when the power supply voltage jumps.
The energy limiting end and the output end of the optocoupler isolator are used for limiting the output current and voltage by a third resistor R18 and a first diode V10 so as to protect the optocoupler isolator from being damaged during normal use or foreseeable faults, and the isolation is invalid. The data analysis is the same as the input end analysis, the nominal voltage stabilizing value of the voltage stabilizing diode V10 is 6.2V, the voltage stabilizing value is 5.89V-6.45V in consideration of parameter deviation, even if the power supply has a rise fault, the maximum output voltage is 6.45V, and the maximum output voltage is lower than the maximum rated voltage of 7V. When the voltage rises to 7V, v10 will output a voltage clamp value of 5.89V, the output current IO max= (7V-5.89V)/r18=0.1 mA; when normally working, VDD-B is 5V, at which time V10 is in a breakdown state, and the output current io=vdd-B/r18=0.5 mA. The output current of both states is far below 50mA, which is required by the specification of the opto-isolator. Thereby ensuring the normal operation of the optical coupler isolator.
According to the non-An Benan signal switching equipment disclosed by the embodiment, CAN signals output by the non-installation equipment CAN be input to the controller by arranging the second driving circuit, the controller CAN work normally by the peripheral control circuit, and data output by the controller CAN enter the first driving circuit through the isolating circuit, so that CAN signals meeting the requirements of the intrinsic safety equipment are output through the first driving circuit, and the conversion of the CAN signals between the non-installation equipment and the intrinsic safety equipment is realized.
Example 2
In this embodiment, a non-safety signal transfer system is disclosed, including a non-safety signal transfer device disclosed in embodiment 1.
The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
While the foregoing description of the embodiments of the present utility model has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the utility model, but rather, it is intended to cover all modifications or variations within the scope of the utility model as defined by the claims of the present utility model.
Claims (10)
1. The non-safety intrinsic safety signal switching device is characterized by comprising a controller; the signal output port of the controller is connected with the first driving circuit through the isolation circuit; the signal input port of the controller is connected with the second driving circuit; the reset port of the controller is connected with the peripheral control circuit;
the first driving circuit comprises a first driving chip, an output port of the first driving chip is connected with a first wiring terminal, an input port of the first driving chip is connected with the isolation circuit, and the first wiring terminal is used for being connected with the local equipment; the second driving circuit comprises a second driving chip, an input port of the second driving chip is connected with a signal input port of the controller, an output port of the second driving chip is connected with a second wiring terminal, and the second wiring terminal is used for being connected with non-installation equipment.
2. The non-intrinsic safety signal switching device as claimed in claim 1, wherein a bidirectional clamping tube is connected between the two output ports of the second driving chip and the connection circuit of the second connection terminal.
3. A non-intrinsic safety signal transfer device as in claim 1, wherein the controller is further coupled to a dip switch.
4. The non-intrinsically safe signal switching apparatus of claim 1, wherein the first output port of the first driver chip is coupled to the first terminal via a first circuit and the second output port of the first driver chip is coupled to the first terminal via a second circuit, the first circuit and the second circuit each having a fuse coupled in series; a dial switch and a bidirectional clamping tube are connected between the first circuit and the second circuit, and the dial switch and the bidirectional clamping tube are connected in parallel; the two input ports of the first driving chip are respectively connected with the controller through the isolating circuit.
5. The non-intrinsic safety signal switching device as claimed in claim 4, wherein two bidirectional clamping tubes are connected between the first circuit and the second circuit of the first driving chip; the two bidirectional clamping pipes are connected in parallel and are connected in parallel with the dial switch.
6. The non-intrinsically-safe signal transit of claim 4, wherein the isolation circuitry includes first and second isolation circuitry; the first isolation circuit and the second isolation circuit both comprise signal isolators, the input port of the signal isolators of the first isolation circuit is connected with the controller, the output port of the signal isolators of the first isolation circuit is connected with the first driving circuit, the output port of the signal isolators of the second isolation circuit is connected with the controller, and the input port of the signal isolators of the second isolation circuit is connected with the first driving circuit.
7. The non-intrinsically-safe signal transfer device of claim 6, wherein a second resistor is coupled in series between the input port of the signal isolator of the first isolation circuit and the connection circuit of the controller and between the input port of the signal isolator of the second isolation circuit and the connection circuit of the first drive circuit.
8. The non-intrinsically-safe signal transfer device of claim 6, wherein the output ports of the signal isolators of the first and second isolation circuits are coupled to the cathode of the first diode and to the first end of the second capacitor, and the anode of the first diode and the second end of the second capacitor are coupled to ground.
9. The non-intrinsically safe signal transfer device of claim 6, wherein the enable terminals of the signal isolators of the first and second isolation circuits are coupled to the first terminal of the third resistor, and the second terminal of the third resistor is coupled to the first terminal of the fourth resistor and the first terminal of the first capacitor; the second end of the fourth resistor is connected with the first end of the second capacitor, and the second end of the first capacitor is grounded.
10. A non-intrinsically safe signal transfer system comprising a non-intrinsically safe signal transfer apparatus as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322102075.8U CN220440697U (en) | 2023-08-04 | 2023-08-04 | Non-safety intrinsic safety signal switching equipment and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322102075.8U CN220440697U (en) | 2023-08-04 | 2023-08-04 | Non-safety intrinsic safety signal switching equipment and system |
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| CN220440697U true CN220440697U (en) | 2024-02-02 |
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| CN202322102075.8U Active CN220440697U (en) | 2023-08-04 | 2023-08-04 | Non-safety intrinsic safety signal switching equipment and system |
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