CN214504162U - Isolation DIO dry and wet node input circuit - Google Patents
Isolation DIO dry and wet node input circuit Download PDFInfo
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- CN214504162U CN214504162U CN202120324937.XU CN202120324937U CN214504162U CN 214504162 U CN214504162 U CN 214504162U CN 202120324937 U CN202120324937 U CN 202120324937U CN 214504162 U CN214504162 U CN 214504162U
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Abstract
The utility model discloses an keep apart DIO dry and wet node input circuit, including first conduction circuit, second conduction circuit and optoelectronic coupling circuit, first conduction circuit is connected with optoelectronic coupling circuit's input for first conduction circuit is under the condition of inserting wet node and ground connection node, switches on optoelectronic coupling circuit's input; the second conduction circuit is connected with the input end of the photoelectric coupling circuit and used for outputting voltage to the photoelectric coupling circuit to conduct the input end of the photoelectric coupling circuit under the condition that the first conduction circuit is connected with the dry node and the grounding node; the photoelectric coupling circuit is used for connecting the output end of the photoelectric coupling circuit with the grounding end under the condition that the input end of the photoelectric coupling circuit is conducted; the space of bolt head and jump cap can be saved, the number of node input ends is also reduced, the arrangement space is saved for the PCB, and the use by users is convenient.
Description
Technical Field
The utility model relates to an industrial control technical field, very much relate to an keep apart DIO dry and wet node input circuit.
Background
In industrial control, the conduction of a control circuit can be realized by accessing a dry-wet node circuit. In a traditional scheme for realizing dry and wet node input by isolating a DIO, a PIN head (PIN header) is used for short-circuiting different PIN nodes through jumper caps so as to realize signal input of the dry node or the wet node. However, each node of the conventional dry and wet node input circuit needs to input a dry signal or a wet signal respectively, which brings node pressure with the increase of the number of DIOs, and further easily causes the space of a Printed Circuit Board (PCB) to be limited.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an keep apart DIO wet and dry node input circuit, the arrangement of reducible input node to the space of saving the PCB board.
The embodiment of the utility model provides an keep apart DIO wet node input circuit futilely, including first circuit, the second switches on circuit and optoelectronic coupling circuit, wherein:
the first conduction circuit is connected with the input end of the photoelectric coupling circuit and is used for conducting the input end of the photoelectric coupling circuit under the condition that the first conduction circuit is connected with the wet node and the grounding node;
the second conduction circuit is connected with the input end of the photoelectric coupling circuit and used for outputting voltage to the photoelectric coupling circuit to conduct the input end of the photoelectric coupling circuit under the condition that the first conduction circuit is connected with the dry node and the grounding node;
the photoelectric coupling circuit is used for connecting the output end of the photoelectric coupling circuit with the grounding end under the condition that the input end of the photoelectric coupling circuit is conducted.
As an embodiment of the present application, the first conduction circuit includes a first resistor, an input end of the first resistor is connected to the input end of the node, and an output end of the first resistor is connected to an input end of the photoelectric coupling circuit, and is configured to output a voltage input by the wet node to the input end of the photoelectric coupling circuit when the wet node and the ground node are connected; wherein the node input is used for connecting a wet node or a dry node.
As still another embodiment of the present application, the second turn-on circuit includes a first light emitting diode and a second resistor, wherein:
the anode of the first light-emitting diode is connected with a first input voltage, and the cathode of the first light-emitting diode is connected with the input end of the second resistor and used for outputting the first input voltage to the second resistor;
the output end of the second resistor is connected with the output end of the first resistor and the input end of the photoelectric coupling circuit and used for outputting a first input voltage to the input end of the photoelectric coupling circuit.
As still another embodiment of the present application, a photo coupling circuit includes a second light emitting diode and a photo transistor, wherein:
the positive electrode of the second light emitting diode is connected with the first input end of the photoelectric coupling circuit, and the negative electrode of the second light emitting diode is connected with the second input end of the photoelectric coupling circuit and used for outputting optical signals to the photosensitive transistor under the condition that the input end of the photoelectric coupling circuit is conducted; the first input end of the photoelectric coupling circuit is connected with the output end of the first resistor and the output end of the second resistor; the second input end of the photoelectric coupling circuit is connected with the grounding node;
the base electrode of the photosensitive transistor is used for receiving the optical signal of the second light-emitting diode, the collector electrode of the photosensitive transistor is connected with the first output end of the photoelectric coupling circuit, and the emitter electrode of the photosensitive transistor is connected with the second output end of the photoelectric coupling circuit and used for being connected with the grounding end under the condition of receiving the optical signal of the second light-emitting diode; and the second output end of the photoelectric coupling circuit is connected with the ground terminal.
As another embodiment of the present application, the photocoupling circuit further includes a third light emitting diode, an anode of the third light emitting diode is connected to a cathode of the second light emitting diode, and a cathode of the third light emitting diode is connected to an anode of the second light emitting diode, for outputting an optical signal to the phototransistor when the node input terminal is reversely connected to the ground node.
As another embodiment of this application, still include detection circuitry, detection circuitry is connected with optoelectronic coupling circuit's first output for whether detect optoelectronic coupling circuit's input switches on.
As still another embodiment of the present application, the detection circuit includes a third resistor, a fourth light emitting diode, and a fourth resistor, wherein:
the input end of the third resistor is connected with the second input voltage, and the output end of the third resistor is connected with the anode of the fourth light emitting diode and used for outputting the second input voltage to the fourth light emitting diode;
the negative electrode of the fourth light emitting diode is connected with the first output end of the photoelectric coupling circuit and the input end of the fourth resistor and used for displaying the conduction state of the input end of the photoelectric coupling circuit;
the fourth resistor is used for outputting the voltage output to the fourth resistor from the negative pole of the fourth light-emitting diode.
As another embodiment of the present application, the first conduction circuit further includes a fifth resistor, an input end of the fifth resistor is connected to the output end of the first resistor, the output end of the second resistor, and the first input end of the photoelectric coupling circuit, and an output end of the fifth resistor is connected to the second input end of the photoelectric coupling circuit, so that the input end of the photoelectric coupling circuit is conducted by using the first input voltage output by the second conduction circuit when the node input end is shorted with the ground node.
As another embodiment of the present application, the first conduction circuit further includes a capacitor, a positive electrode of the capacitor is connected to the first input terminal of the photoelectric coupling circuit, and a negative electrode of the capacitor is connected to the second input terminal of the photoelectric coupling circuit.
As another embodiment of the present application, when the wet node and the ground node are connected to the first conduction circuit, the voltage input to the input terminal of the photoelectric coupling circuit by the first conduction circuit is greater than the voltage input to the input terminal of the photoelectric coupling circuit by the second conduction circuit.
In the embodiment of the application, the first conduction circuit is connected with the input end of the photoelectric coupling circuit and is used for conducting the input end of the photoelectric coupling circuit under the condition that the first conduction circuit is connected with the wet node and the grounding node; the second conduction circuit is connected with the input end of the photoelectric coupling circuit and used for outputting voltage to the photoelectric coupling circuit to conduct the input end of the photoelectric coupling circuit under the condition that the first conduction circuit is connected with the dry node and the grounding node; the photoelectric coupling circuit is used for connecting the output end of the photoelectric coupling circuit with the grounding end under the condition that the input end of the photoelectric coupling circuit is conducted; the space of bolt head and jump cap can be saved, the number of node input ends is also reduced, the arrangement space is saved for the PCB, and the use by users is convenient.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without any inventive work.
FIG. 1 is a schematic diagram of a prior art circuit configuration for isolating DIO dry and wet node inputs;
fig. 2 is a schematic structural diagram of an isolated DIO wet-dry node input circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another isolated DIO wet and dry node input circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another isolated DIO wet and dry node input circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another isolated DIO wet and dry node input circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another isolated DIO wet and dry node input circuit according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another isolated DIO wet and dry node input circuit according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The terms "first," "second," "third," and the like in the description and in the claims, and in the drawings described above, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating a circuit structure for isolating a DIO wet/dry node input in the prior art.
As shown in fig. 1, the schematic circuit structure includes a node input terminal, a skip cap, and a photoelectric coupling circuit, wherein:
the node input terminals include a wet node input terminal (which may be a node 3 in the IO CONN in fig. 1), a dry node input terminal (which may be a node 2 in the IO CONN in fig. 1), and a ground node input terminal (which may be a node 1 in the IO CONN in fig. 1); the jump cap may have three nodes, a node 1 is connected to the wet node input terminal and a first resistor (which may be R1 in fig. 1) may be connected between the node 1 and the wet node input terminal, a node 2 is connected to the dry node input terminal and is connected to the first input terminal of the photoelectric coupling circuit (which may be a 1 terminal on the left side of the photoelectric coupling circuit in fig. 1), a node 3 is connected to the first input voltage terminal and a second resistor (which may be R2 in fig. 1) may be connected between the node 3 and the first input voltage terminal; the photoelectric coupling circuit is internally provided with a light emitting diode and a phototriode corresponding to the light emitting diode, the anode of the light emitting diode is communicated with the first input end of the photoelectric coupling circuit, the cathode of the light emitting diode is communicated with the second input end (which can be the left end 2 of the photoelectric coupling circuit in figure 1), the second input end of the photoelectric coupling circuit is connected with a grounding node and is connected with a first grounding end, the base of the phototriode is used for receiving the optical signal of the light emitting diode, the collector of the phototriode is communicated with the first output end (which can be the right end 1 of the photoelectric coupling circuit in figure 1) of the photoelectric coupling circuit, the emitter of the phototriode is communicated with the second output end (which can be the right end 2 of the photoelectric coupling circuit in figure 1) of the photoelectric coupling circuit, the first output end of the photoelectric coupling circuit is connected with a second input voltage end, and a third resistor (which can be the right end 2 of the photoelectric coupling circuit in figure 1) is connected between the first output end and the second input voltage end R3) connected to the other components, and a fourth resistor (which may be R4 in fig. 1) connected between the second output end of the photoelectric coupling circuit and the second ground end; the second input end and the second output end of the photoelectric coupling circuit are further connected with a first capacitor (which may be C1 in fig. 1) for blocking the second input voltage of the second input voltage end from being output to the second input end of the photoelectric coupling circuit; a second capacitor (may be C2 in fig. 1) is further connected between the first ground terminal and the second ground terminal, and is configured to block the second input voltage of the second input voltage terminal from being output to the first ground terminal.
It should be noted that the wet node provided by the present invention may be, but is not limited to, a relay (i.e., a component with its own power supply), and the dry node may be, but is not limited to, a switch (i.e., a component without its own power supply).
Specifically, under the condition that the node input end is connected with a wet node and a ground node, a pin head (pin header) is used for short-circuiting a node 1 and a node 2 of the jump cap, so that a voltage signal connected with the wet node is output to the node 1 of the jump cap through a first resistor, the voltage signal connected with the wet node is output to a first input end of a photoelectric coupling circuit through the node 2 of the jump cap, and further the voltage signal is output to a first ground end through a second input end of the photoelectric coupling circuit, and the input end of the photoelectric coupling circuit is conducted. Under the condition that the input end of the photoelectric coupling circuit is conducted, the light emitting diode arranged in the photoelectric coupling circuit emits light, so that the phototriode collects light signals of the light emitting diode, the second input voltage of the second input voltage end is input to the first output end of the photoelectric coupling circuit, and the second output end of the photoelectric coupling circuit outputs the light signals to other parts which can be used for detecting whether the photoelectric coupling circuit is conducted or not, for example but not limited to inputting the second input voltage to a single chip microcomputer connected with the second output end of the photoelectric coupling circuit, and whether the voltage is connected or not is judged through the single chip microcomputer so as to determine whether the photoelectric coupling circuit is conducted or not. The second input voltage of the second input voltage end can be set to 5 volts, and the model of the photoelectric coupling circuit can be U6316 TLP785 (GB).
Specifically, under the condition that the node input end is connected with a dry node and a grounding node, because the dry node cannot be provided with a power supply, the node 2 and the node 3 of the jump cap can be in short circuit through the plug pin, so that the first input voltage of the first input voltage end is input to the node 3 of the jump cap (namely, the power supply is provided for the dry node), the first input voltage is input to the first input end of the photoelectric coupling circuit through the node 2 of the jump cap, and further the second input end of the photoelectric coupling circuit is output to the first grounding end, and the input end of the photoelectric coupling circuit is conducted. Under the condition that the input end of the photoelectric coupling circuit is conducted, the light emitting diode arranged in the photoelectric coupling circuit emits light, so that the phototriode collects light signals of the light emitting diode, the second input voltage of the second input voltage end is input to the first output end of the photoelectric coupling circuit, and the second input voltage is output to other parts which can be used for detecting whether the photoelectric coupling circuit is conducted or not through the second output end of the photoelectric coupling circuit, for example but not limited to a single chip microcomputer which inputs the second input voltage to the second output end of the photoelectric coupling circuit. Wherein the first input voltage of the first input voltage terminal may be set to 5 volts.
Be provided with the input node that is used for inserting dry node and wet node respectively among the prior art, and also correspond the difference to the connected mode of different node bolt heads to jumping the cap, can lead to the node quantity of access and the quantity of jumping the cap to increase when DIO quantity is more, and then increase the occupation space of PCB board, influence user's demand. Secondly, when the input node is reversely connected with the grounding node, the light emitting diode of the photoelectric coupling circuit cannot be caused to emit light, and the photoelectric coupling circuit cannot be conducted, so that the judgment of a user is influenced.
To the above prior art, fig. 2 shows a schematic structural diagram of an isolated DIO wet-dry node input circuit provided by an embodiment of the present invention.
As shown in fig. 2, the isolated DIO wet and dry node input circuit includes a first conduction circuit 201, a second conduction circuit 202 and a photo coupling circuit 203, wherein:
the first conduction circuit 201 is connected with the input end of the photoelectric coupling circuit 202, and is used for conducting the input end of the photoelectric coupling circuit 203 under the condition that the first conduction circuit 201 is connected with a wet node and a ground node;
the second conduction circuit 202 is connected to the input terminal of the photoelectric coupling circuit 203, and is used for outputting a voltage to the photoelectric coupling circuit 203 to conduct the input terminal of the photoelectric coupling circuit 203 when the first conduction circuit 201 is connected to the dry node and the ground node;
the photocoupling circuit 203 is used for connecting the output end of the photocoupling circuit 203 to the ground end under the condition that the input end of the photocoupling circuit 203 is conducted.
Specifically, a dry node or a wet node to which the first conduction circuit 201 is connected may be input from one node input terminal, and in the case of connecting the wet node and the ground node, the first conduction circuit 201 is connected to the photo coupling circuit 203, and a signal input from the wet node is input to the photo coupling circuit 203 and output from the photo coupling circuit 203 to the ground node, so that the photo coupling circuit 203 is turned on. When the dry node and the ground node are connected, a signal input from the dry node and a voltage input from the second conduction circuit are input to the photo coupling circuit 203 and output from the photo coupling circuit 203 to the ground node, so that the photo coupling circuit 203 is turned on.
The embodiment of the utility model provides an in, can save the space of bolt head and jump the cap, also reduce the quantity of node input end simultaneously, saved the arrangement space for the PCB board, the user of being convenient for uses.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another isolated DIO wet and dry node input circuit according to an embodiment of the present invention.
As an embodiment of the present invention, as shown in fig. 3, the first conduction circuit includes a first resistor 301, an input end of the first resistor 301 is connected to the node input end 302, and an output end of the first resistor 301 is connected to an input end of the photoelectric coupling circuit, and is configured to output a voltage input from the wet node to the input end of the photoelectric coupling circuit when the wet node and the ground node 303 are connected; wherein the node input 302 is used to connect to a wet node or a dry node.
Specifically, the first conduction circuit is connected to the node input terminal 302 and the ground node 303, wherein one end of the first conduction circuit connected to the node input terminal 302 may be connected to an input terminal of the photoelectric coupling circuit, and a first resistor 301 is connected between the node input terminal 302 and the input terminal of the photoelectric coupling circuit, and one end of the first conduction circuit connected to the ground node may be connected to another input terminal of the photoelectric coupling circuit.
Specifically, when the first conduction circuit is connected to the wet node and the ground node 303, the power signal input from the wet node is input to the input terminal of the photoelectric coupling circuit through the first resistor 301, and the power signal is output to the ground node through the other input terminal of the photoelectric coupling circuit, so as to form a loop to realize conduction of the input terminal of the photoelectric coupling circuit.
The first resistor 301 may be used to limit the current of the power signal input from the wet node, and the resistance may be set to 4.7 kohm, but not limited to this.
As another embodiment of the present invention, as shown in fig. 3, the second conducting circuit includes a first light emitting diode 304 and a second resistor 305, wherein:
the anode of the first light emitting diode 304 is connected to the first input voltage 306, and the cathode of the first light emitting diode 304 is connected to the input terminal of the second resistor 305, for outputting the first input voltage 306 to the second resistor 305;
an output terminal of the second resistor 305 is connected to an output terminal of the first resistor 301 and an input terminal of the photoelectric coupling circuit, and is configured to output a first input voltage 306 to the input terminal of the photoelectric coupling circuit.
Specifically, the second conduction circuit may be connected to the first input voltage terminal, and is configured to receive the first input voltage 306 input by the first input voltage terminal as a power source when the first conduction circuit is connected to the dry node signal, and input the first input voltage 306 to an input terminal of the photocoupling circuit connected to the node input terminal 302.
Specifically, when the first conductive circuit is connected to the trunk node and the ground node 303, a signal inputted from the trunk node and a first input voltage sequentially flowing through the first light emitting diode 304 and the second resistor 305 are inputted to the first light emitting diode 304 and the second resistor 305.
The second resistor 305 may be used to limit the current input from the first input voltage terminal, and the resistance may be set to 4.7 kohms, but not limited thereto.
It should be noted that, no matter the first conduction circuit is connected to the wet node or the dry node, the first input voltage terminal can input the first input voltage to the second conduction circuit, and when the first conduction circuit is connected to the wet node, the power signal input by the wet node cannot flow into the first input voltage terminal due to the unidirectional conductivity of the first light emitting diode, so that the power signal input by the wet node can be prevented from flowing back to the first input voltage terminal.
As another embodiment of the present invention, the first conduction circuit is connected to the wet node and the ground node, and the first conduction circuit is connected to the input of the photoelectric coupling circuit.
Specifically, the power signal of the first conduction circuit connected to the wet node is determined according to the type of the wet node, the value of the power signal is relatively fixed, in order to reduce the input cost on the PCB, the value of the first input voltage 306 input by the first input voltage end can be controlled, and the condition that the first input voltage 306 can normally conduct the photoelectric coupling circuit under the condition that the first conduction circuit is connected to the dry node is met. The first input voltage 306 input by the first input voltage terminal may be, but is not limited to, set to be between 5 volts and 30 volts.
As another embodiment of the present invention, as shown in fig. 3, the photoelectric coupling circuit includes a second light emitting diode 307 and a phototransistor 308, wherein:
the anode of the second light emitting diode 307 is connected to a first input terminal (which may be 1 terminal of the left input terminal of the photoelectric coupling circuit in fig. 3) of the photoelectric coupling circuit, and the cathode of the second light emitting diode 307 is connected to a second input terminal (which may be 2 terminal of the left input terminal of the photoelectric coupling circuit in fig. 3) of the photoelectric coupling circuit, and is configured to output an optical signal to the phototransistor 308 when the input terminal of the photoelectric coupling circuit is turned on; a first input end of the photoelectric coupling circuit is connected with an output end of the first resistor 301 and an output end of the second resistor 305; a second input end of the photoelectric coupling circuit is connected with the ground node 303;
the base of the phototransistor 308 is used to receive the optical signal of the second light emitting diode 307, the collector of the phototransistor 308 is connected to the first output terminal (which may be 1 terminal of the right output terminal of the optoelectronic coupling circuit in fig. 3) of the optoelectronic coupling circuit, the emitter of the phototransistor 308 is connected to the second output terminal (which may be 2 terminal of the right output terminal of the optoelectronic coupling circuit in fig. 3) of the optoelectronic coupling circuit, and the phototransistor 308 is used to turn on the ground terminal 309 when receiving the optical signal of the second light emitting diode 307; a second output terminal of the photoelectric coupling circuit is connected to the ground terminal 309.
Specifically, when the first conduction circuit is connected to the wet node and the ground node 303, the power signal input from the wet node is input to the first input terminal of the photoelectric coupling circuit through the first resistor 301 (the first input voltage 306 output from the second conduction circuit may be input to the input terminal of the photoelectric coupling circuit without being limited to the power signal input from the wet node), and the power signal is output to the ground node 303 through the second input terminal of the photoelectric coupling circuit, so as to form a loop to realize conduction of the input terminal of the photoelectric coupling circuit. When the input terminal of the photoelectric coupling circuit is turned on, the second light emitting diode 307 emits a light signal, the light signal is received by the phototransistor 308, and the signal inputted to the first output terminal of the photoelectric coupling circuit is outputted to the ground terminal 309 through the second output terminal of the photoelectric coupling circuit, so as to form a loop to realize the turn-on of the output terminal of the photoelectric coupling circuit.
Specifically, when the first conduction circuit is connected to the dry node and the ground node 303, the second conduction circuit inputs the first input voltage 306 to the first input terminal of the photoelectric coupling circuit, and the second input terminal of the photoelectric coupling circuit outputs the first input voltage 306 to the ground node 303, so as to form a loop to realize conduction of the input terminal of the photoelectric coupling circuit. When the input terminal of the photoelectric coupling circuit is turned on, the second light emitting diode 307 emits a light signal, the light signal is received by the phototransistor 308, and the signal inputted to the first output terminal of the photoelectric coupling circuit is outputted to the ground terminal 309 through the second output terminal of the photoelectric coupling circuit, so as to form a loop to realize the turn-on of the output terminal of the photoelectric coupling circuit.
As another embodiment of the present invention, refer to fig. 4 which shows a schematic structural diagram of another isolated DIO wet-dry node input circuit provided by the present invention.
As shown in fig. 4, in order to prevent the first conduction circuit from connecting the reverse node input terminal 302 and the ground node 303, which results in that the photoelectric coupling circuit cannot conduct, the photoelectric coupling circuit further includes a third light emitting diode 401, an anode of the third light emitting diode 401 is connected to a cathode of the second light emitting diode 307, and a cathode of the third light emitting diode 401 is connected to an anode of the second light emitting diode 307, for outputting an optical signal to the phototransistor when the node input terminal is connected to the ground node in a reverse manner.
Specifically, when the first conduction circuit is connected to the anti-wet node and the ground node 303, the first conduction circuit inputs the power signal input from the wet node to the second input terminal of the photoelectric coupling circuit, and the power signal is output from the first input terminal of the photoelectric coupling circuit to the node input terminal through the third light emitting diode 401, so as to form a loop to realize conduction of the input terminal of the photoelectric coupling circuit. When the input terminal of the photoelectric coupling circuit is turned on, the second light emitting diode 307 emits a light signal, the light signal is received by the phototransistor 308, and the signal inputted to the first output terminal of the photoelectric coupling circuit is outputted to the ground terminal 309 through the second output terminal of the photoelectric coupling circuit, so as to form a loop to realize the turn-on of the output terminal of the photoelectric coupling circuit. The first input voltage 306 inputted by the second conducting circuit may be smaller than the power signal inputted by the wet node, and is outputted to the node input terminal, and the reverse flow of the power signal inputted by the wet node can be prevented by utilizing the unidirectional conductivity of the first light emitting diode 304 in the second conducting circuit.
In the case where the first conduction circuit is connected to the anti-dry node and the ground node 303, since the dry node and the ground node 303 have the same function (i.e., cannot be powered), the first input voltage 306 is input to the first input terminal of the photoelectric coupling circuit by the second conduction circuit, and the first input voltage 306 is output to the ground node 303 by the second input terminal of the photoelectric coupling circuit, so that a loop is formed to realize conduction of the input terminal of the photoelectric coupling circuit. When the input terminal of the photoelectric coupling circuit is turned on, the second light emitting diode 307 emits a light signal, the light signal is received by the phototransistor 308, and the signal inputted to the first output terminal of the photoelectric coupling circuit is outputted to the ground terminal 309 through the second output terminal of the photoelectric coupling circuit, so as to form a loop to realize the turn-on of the output terminal of the photoelectric coupling circuit.
As another embodiment of the present invention, refer to fig. 5, which shows a schematic structural diagram of another isolated DIO wet-dry node input circuit provided by the present invention.
As shown in fig. 5, the isolated DIO dry-wet node input circuit further includes a detection circuit, and the detection circuit is connected to the first output terminal of the photoelectric coupling circuit and is configured to detect whether the input terminal of the photoelectric coupling circuit is turned on.
Specifically, the detection circuit includes a third resistor 501, a fourth light emitting diode 502, and a fourth resistor 503, where:
the input end of the third resistor 501 is connected to the second input voltage 504, and the output end of the third resistor 501 is connected to the anode of the fourth led 502, so as to output the second input voltage 504 to the fourth led 502;
the cathode of the fourth light emitting diode 502 is connected with the first output end of the photoelectric coupling circuit and the input end of the fourth resistor 503, and is used for displaying the conduction state of the input end of the photoelectric coupling circuit;
the fourth resistor 503 is used to output a voltage output from the cathode of the fourth light emitting diode 502 to the fourth resistor 503.
Specifically, the second input voltage 504 can be continuously output to the detection circuit from the second input voltage terminal, and the second input voltage 504 sequentially flowing through the third resistor 501 and the fourth light emitting diode 502 can be output to the other component connected to the fourth resistor 503 when the photocoupler circuit is not turned on. The other components may be, but are not limited to, a single chip microcomputer, and receive the second input voltage 504 output from the output terminal of the fourth resistor 503.
When the photocoupler circuit is turned on, a second input voltage 504 sequentially flowing through the third resistor 501 and the fourth led 502 generates two branches, one branch is used for outputting to other components connected to the fourth resistor 503, and the other branch is used for flowing into the first output terminal of the photocoupler circuit and outputting from the second output terminal of the photocoupler circuit to the ground terminal 309. The other components may be, but are not limited to, a single chip microcomputer, and receive the voltage output from the output terminal of the fourth resistor 503.
In the case where the other component connected to the fourth resistor 503 is a single chip microcomputer, for example, when the photocoupler circuit is turned from the non-conductive state to the conductive state, the voltage signal received by the single chip microcomputer is changed from the high voltage to the low voltage. It can be understood that whether the voltage received by the single chip microcomputer changes or not can be judged to be used for detecting whether the photoelectric coupling circuit is conducted or not. Wherein, when the singlechip detects that the received voltage changes, still can demonstrate for the user through fourth emitting diode 502's colour change, for example when photoelectric coupling circuit is in not conducting state, fourth emitting diode 502 is conducting state and pilot lamp colour is the red light, and when photoelectric coupling circuit changed into conducting state, the pilot lamp colour of the steerable fourth emitting diode 502 of singlechip was the green light.
The third resistor 501 may be used to limit the current input from the second input voltage terminal, and the resistance may be set to 4.7 kohms, but is not limited thereto. The fourth resistor 503 may be used to limit the current output to other components, and the resistance may be set to 100 ohms, but is not limited thereto.
As another embodiment of the present invention, refer to fig. 6, which shows a schematic structural diagram of another isolated DIO wet-dry node input circuit provided by the present invention.
As shown in fig. 6, the first conduction circuit further includes a fifth resistor 601, an input terminal of the fifth resistor 601 is connected to the output terminal of the first resistor 301, the output terminal of the second resistor 305, and the first input terminal of the photoelectric coupling circuit, and an output terminal of the fifth resistor 601 is connected to the second input terminal of the photoelectric coupling circuit, so that the input terminal of the photoelectric coupling circuit is conducted by using the first input voltage 306 output by the second conduction circuit when the node input terminal is shorted with the ground node.
Specifically, in the case where the node input terminal is short-circuited with the ground node 303, the first input voltage 306, which is input from the first input voltage terminal and sequentially flows through the first light emitting diode 304 and the second resistor 305, flows into three branches, one branch is used for outputting a voltage to the node input terminal, one branch is used for outputting a voltage to the first input terminal of the photoelectric coupling circuit, and one branch is used for outputting a voltage to the fifth resistor 601, so that the first input voltage 306 can be output to the first input terminal of the photoelectric coupling circuit, thereby achieving conduction of the input terminal of the photoelectric coupling circuit.
As another embodiment of the present invention, refer to fig. 7, which shows a schematic structural diagram of another isolated DIO wet-dry node input circuit provided by the present invention.
As shown in fig. 7, the first conduction circuit further includes a capacitor 701, a positive electrode of the capacitor 701 is connected to a first input terminal of the photocoupling circuit, and a negative electrode of the capacitor 701 is connected to a second input terminal of the photocoupling circuit, for preventing parasitic oscillation of the circuit caused by a positive feedback path formed by the power supply when the node input terminal is disconnected from the ground node 701.
It should be noted that the isolated DIO wet and dry node input circuit shown in fig. 7 may not be limited to include the fifth resistor 601, and may also be an isolated DIO wet and dry node input circuit that does not include the fifth resistor 601, and will not be described herein again.
It will be understood by those skilled in the art that all or part of the processes of the above embodiments may be implemented, and that the above embodiments are only preferred embodiments of the present application, and certainly, the scope of the present application is not limited by the above embodiments, and therefore all equivalent changes and modifications which can be made to the claims of the present application are intended to be covered by the present application.
Claims (10)
1. The utility model provides an keep apart DIO wet and dry node input circuit which characterized in that, includes first switch-on circuit, second switch-on circuit and optoelectronic coupling circuit, wherein:
the first conduction circuit is connected with the input end of the photoelectric coupling circuit and is used for conducting the input end of the photoelectric coupling circuit under the condition that the first conduction circuit is connected with a wet node and a grounding node;
the second conduction circuit is connected with the input end of the photoelectric coupling circuit and used for outputting voltage to the photoelectric coupling circuit to conduct the input end of the photoelectric coupling circuit under the condition that the first conduction circuit is connected with the dry node and the grounding node;
the photoelectric coupling circuit is used for connecting the output end of the photoelectric coupling circuit with the ground end under the condition that the input end of the photoelectric coupling circuit is conducted.
2. The circuit of claim 1, wherein the first conducting circuit comprises a first resistor, an input terminal of the first resistor is connected to a node input terminal, and an output terminal of the first resistor is connected to an input terminal of the optoelectronic coupling circuit, for outputting a voltage input from the wet node to the input terminal of the optoelectronic coupling circuit when the wet node and a ground node are connected; wherein the node input is for connecting the wet node or the dry node.
3. The circuit of claim 2, wherein the second turn-on circuit comprises a first light emitting diode and a second resistor, wherein:
the anode of the first light emitting diode is connected with a first input voltage, and the cathode of the first light emitting diode is connected with the input end of the second resistor and used for outputting the first input voltage to the second resistor;
the output end of the second resistor is connected with the output end of the first resistor and the input end of the photoelectric coupling circuit, and is used for outputting the first input voltage to the input end of the photoelectric coupling circuit.
4. The circuit of claim 3, wherein the opto-electronic coupling circuit comprises a second light emitting diode and a phototransistor, wherein:
the anode of the second light emitting diode is connected with the first input end of the photoelectric coupling circuit, and the cathode of the second light emitting diode is connected with the second input end of the photoelectric coupling circuit and used for outputting optical signals to the photosensitive transistor under the condition that the input end of the photoelectric coupling circuit is conducted; a first input end of the photoelectric coupling circuit is connected with an output end of the first resistor and an output end of the second resistor; a second input end of the photoelectric coupling circuit is connected with the grounding node;
the base electrode of the photosensitive transistor is used for receiving the optical signal of the second light-emitting diode, the collector electrode of the photosensitive transistor is connected with the first output end of the photoelectric coupling circuit, and the emitter electrode of the photosensitive transistor is connected with the second output end of the photoelectric coupling circuit and used for being connected with the grounding end under the condition of receiving the optical signal of the second light-emitting diode; and the second output end of the photoelectric coupling circuit is connected with the grounding end.
5. The circuit of claim 4, wherein the optocoupler circuit further comprises a third light emitting diode, an anode of the third light emitting diode being coupled to a cathode of the second light emitting diode, and a cathode of the third light emitting diode being coupled to an anode of the second light emitting diode, for outputting an optical signal to the phototransistor when the node input is coupled in reverse to the ground node.
6. The circuit of claim 4, further comprising a detection circuit, wherein the detection circuit is connected to the first output terminal of the photoelectric coupling circuit, and is configured to detect whether the input terminal of the photoelectric coupling circuit is turned on.
7. The circuit of claim 6, wherein the detection circuit comprises a third resistor, a fourth light emitting diode, and a fourth resistor, wherein:
the input end of the third resistor is connected with a second input voltage, and the output end of the third resistor is connected with the anode of the fourth light emitting diode and used for outputting the second input voltage to the fourth light emitting diode;
the negative electrode of the fourth light emitting diode is connected with the first output end of the photoelectric coupling circuit and the input end of the fourth resistor and is used for displaying the conduction state of the input end of the photoelectric coupling circuit;
the fourth resistor is used for outputting the voltage output to the fourth resistor from the cathode of the fourth light emitting diode.
8. The circuit of claim 4, wherein the first conduction circuit further comprises a fifth resistor, an input terminal of the fifth resistor is connected to the output terminal of the first resistor, the output terminal of the second resistor, and the first input terminal of the optoelectronic coupling circuit, and an output terminal of the fifth resistor is connected to the second input terminal of the optoelectronic coupling circuit, so as to conduct the input terminal of the optoelectronic coupling circuit by using the first input voltage output by the second conduction circuit when the node input terminal is shorted with the ground node.
9. The circuit of claim 7, wherein the first conducting circuit further comprises a capacitor, an anode of the capacitor is connected to the first input terminal of the photoelectric coupling circuit, and a cathode of the capacitor is connected to the second input terminal of the photoelectric coupling circuit.
10. The circuit of claim 1, wherein when the first conduction circuit is connected to the wet node and the ground node, the voltage input to the input terminal of the optoelectronic coupling circuit by the first conduction circuit is greater than the voltage input to the input terminal of the optoelectronic coupling circuit by the second conduction circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120324937.XU CN214504162U (en) | 2021-02-04 | 2021-02-04 | Isolation DIO dry and wet node input circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120324937.XU CN214504162U (en) | 2021-02-04 | 2021-02-04 | Isolation DIO dry and wet node input circuit |
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| Publication Number | Publication Date |
|---|---|
| CN214504162U true CN214504162U (en) | 2021-10-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120324937.XU Active CN214504162U (en) | 2021-02-04 | 2021-02-04 | Isolation DIO dry and wet node input circuit |
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| Country | Link |
|---|---|
| CN (1) | CN214504162U (en) |
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2021
- 2021-02-04 CN CN202120324937.XU patent/CN214504162U/en active Active
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