CN218648812U - 2-wire mode transceiving communication circuit without independent working power supply - Google Patents
2-wire mode transceiving communication circuit without independent working power supply Download PDFInfo
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- CN218648812U CN218648812U CN202223033002.XU CN202223033002U CN218648812U CN 218648812 U CN218648812 U CN 218648812U CN 202223033002 U CN202223033002 U CN 202223033002U CN 218648812 U CN218648812 U CN 218648812U
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Abstract
The utility model discloses a 2 line mode receiving and dispatching communication circuit that need not independent power supply relates to the communication field, and this 2 line mode receiving and dispatching communication circuit that need not independent power supply includes: the host is used for carrying out information transmission with the extension; the extension sets are used for establishing communication with the host, and the number of the extension sets is multiple; the host computer includes: the constant current source module is used for supplying constant current sources to the extension sets; the pulse detection comparator module is used for receiving the information that the extension set changes the constant current source and sending the information to the sending and control module; the sending and controlling module is used for sending information to the extension set by changing the size of the constant current source; compared with the prior art, the beneficial effects of the utility model are that: the receiving and transmitting part of the extension of the utility model does not need a special chip and an independent working power supply, and only uses a photoelectric coupler to complete the receiving and transmitting task; when the extension set and the host machine receive and send out, the voltage provided by the host machine and 2 photoelectric couplers are utilized to complete the receiving and sending out, so that the isolation characteristic is achieved, the circuit is simple, and the cost is low.
Description
Technical Field
The utility model relates to the field of communication, specifically a 2 line mode receiving and dispatching communication circuit who need not independent work power.
Background
The existing RS485 for 2-wire mode communication is a standard of a serial data interface, is generated for overcoming the defects of short communication distance, low speed and the like of RS232, is a standard established on the basis of RS422, increases the multipoint and bidirectional communication capability, namely allows a plurality of transmitters to be connected to the same bus, uses a pair of twisted-pair wires, adopts 3 photoelectric couplers for isolation, and needs to provide an independent working power supply. For RS485 communication in 2-line mode, dedicated chips such as MAX485E, MAX487E, MAX1487E, and SN75LBC184 are generally used for transmission and reception.
By utilizing the RS485 standard, a relatively economic communication platform with high noise suppression and high transmission rate can be established, but when a system for carrying out bidirectional communication between 1 host and N extensions is constructed, a special chip is used in each extension to provide an independent working power supply, and 3 photoelectric couplers are needed for isolation, so that the cost is high, the circuit is complex, and the improvement is needed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a 2 line mode receiving and dispatching communication circuit who need not independent operating power to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a 2-wire mode transceiver communication circuit without an independent operating power supply, comprising:
the main machine is used for carrying out information transmission with the extension set;
the extension sets are used for establishing communication with the host, and the number of the extension sets is multiple;
the host computer includes:
the constant current source module is used for supplying constant current sources to the extension sets;
the pulse detection comparator module is used for receiving the information of the extension set changing the constant current source and sending the information to the sending and control module;
the sending and controlling module is used for sending information to the extension set by changing the size of the constant current source; and receiving extension information;
the constant current source module is connected with the extension, the extension is connected with the pulse detection comparator module and the sending and control module, and the pulse detection comparator module is connected with the sending and control module.
As a further aspect of the present invention: the constant current source module comprises a resistor R1, a resistor R3, a triode Q1 and a triode Q2, wherein one end of the resistor R1 is connected with a 15V voltage and an emitting electrode of the triode Q1, the other end of the resistor R1 is connected with a base electrode of the triode Q1 and an emitting electrode of the triode Q3, a collecting electrode of the triode Q1 is connected with a base electrode of the triode Q3 and one end of the resistor R3, the other end of the resistor R3 is grounded, and a collecting electrode of the triode Q3 is connected with an extension.
As a further aspect of the present invention: the pulse detection comparator module comprises a resistor R2, a triode Q2 and a resistor R4, the emitting electrode of the triode Q2 is connected with 5V voltage, the base electrode of the triode Q2 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with the extension, the collector electrode of the triode Q2 is connected with one end of the resistor R4, the transmission and control module is connected with the other end of the resistor R4, and the other end of the resistor R4 is grounded.
As the utility model discloses further scheme again: the sending and control module comprises a single chip microcomputer U1, an MOS tube Q4, an MOS tube Q6, a triode Q5, a resistor R6, a resistor R7 and a resistor R8, the model of the single chip microcomputer U1 is MK6A12P, the S pole of the MOS tube Q4 is connected with one end of the resistor R5, the voltage is 15V, the G pole of the MOS tube Q4 is connected with the other end of the resistor R5, the collector electrode of the triode Q5, the D pole of the MOS tube Q4 is connected with an extension, the D pole of the MOS tube Q6 is grounded through the resistor R8, the G pole of the MOS tube Q6 is connected with the emitter electrode of the triode Q5 and the No. 2 pin of the single chip microcomputer U1, the base electrode of the triode Q5 is connected with one end of the resistor R6 and one end of the resistor R7, the other end of the resistor R7 is grounded, the other end of the resistor R6 is connected with the No. 1 pin of the food grade, and the No. 3 pin of the single chip microcomputer U1 is connected with a pulse detection comparator module.
As a further aspect of the present invention: the extension includes resistance R9, diode D1, opto-coupler PH2, resistance R10, resistance R11, constant current source module is connected to resistance R9's one end, the pulse detects the comparator module, send and control module, opto-coupler PH 1's third end, opto-coupler PH 1's fourth end, opto-coupler PH 2's second end, diode D1's negative pole is connected to resistance R9's the other end, opto-coupler PH 1's first end is connected to diode D1's positive pole, opto-coupler PH 2's first end, opto-coupler PH 2's third end, opto-coupler PH 1's second end passes through resistance R10 and connects the signal of sending, received signal is connected to opto-coupler PH 2's fourth end, resistance R11's one end, resistance R11's other end ground connection.
Compared with the prior art, the beneficial effects of the utility model are that: the receiving and transmitting part of the extension set of the utility model does not need a special chip and an independent working power supply, and only uses a photoelectric coupler to complete the receiving and transmitting task; when the extension set and the host machine transmit and receive, the voltage provided by the host machine and 2 photoelectric couplers are utilized to complete the transmission, so that the isolation characteristic is achieved, the circuit is simple, and the cost is low.
Drawings
Fig. 1 is a circuit diagram of a 2-wire mode transceiving communication circuit without a separate operating power supply.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention.
Referring to fig. 1, a 2-wire mode transceiving communication circuit without an independent operating power supply includes:
the host is used for carrying out information transmission with the extension;
the extension sets are used for establishing communication with the host, and the number of the extension sets is multiple;
the host computer includes:
the constant current source module is used for supplying constant current sources to the extension sets;
the pulse detection comparator module is used for receiving the information that the extension set changes the constant current source and sending the information to the sending and control module;
the sending and controlling module is used for sending information to the extension set by changing the size of the constant current source; and receiving extension information;
the constant current source module is connected with the extension, the extension is connected with the pulse detection comparator module and the sending and control module, and the pulse detection comparator module is connected with the sending and control module.
In this embodiment: referring to fig. 1, the constant current source module includes a resistor R1, a resistor R3, a triode Q1, and a triode Q2, wherein one end of the resistor R1 is connected to a 15V voltage and an emitter of the triode Q1, the other end of the resistor R1 is connected to a base of the triode Q1 and an emitter of the triode Q3, a collector of the triode Q1 is connected to a base of the triode Q3 and one end of the resistor R3, the other end of the resistor R3 is grounded, and a collector of the triode Q3 is connected to the extension.
The transistor Q3 is conducted to provide an emitter current I 3 When I is 3 The pressure drop U generated at R1 R3 ＝I 3 R 3 At 0.5V or more (0.5V is the turn-on voltage of Q1), Q1 starts to turn on to limit the BE junction voltage of Q3, therefore
This current is supplied to the SL line for use by the extension through the collector of Q3.
In this embodiment: referring to fig. 1, the pulse detection comparator module includes a resistor R2, a transistor Q2, and a resistor R4, wherein an emitter of the transistor Q2 is connected to a voltage of 5V, a base of the transistor Q2 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to the extension, a collector of the transistor Q2 is connected to one end of the resistor R4, the transmission and control module, and the other end of the resistor R4 is grounded.
When the voltage of the SL line is lower than 4.5V, the base electrode of the triode Q2 is provided with current through the resistor R2, so that the triode Q2 is in saturated conduction to generate 5V high level at two ends of the resistor R4 and provide the 5V high level for a pin 3 of the singlechip U1, when the voltage of the SL line is higher than 4.5V, the triode Q2 is cut off, 0V low level is generated at two ends of the resistor R4 and provided for a pin 3 of the singlechip U1, and the singlechip U1 analyzes a string of high level and low level to obtain information sent by the extension. The pulse detection comparator module outputs the information sent by the extension set to the sending and control module.
In this embodiment: referring to fig. 1, the sending and controlling module includes a single chip microcomputer U1, an MOS transistor Q4, an MOS transistor Q6, a triode Q5, a resistor R6, a resistor R7, and a resistor R8, where the model of the single chip microcomputer U1 is MK6a12P, the S pole of the MOS transistor Q4 is connected to one end of the resistor R5, and a voltage of 15V, the other end of the resistor R5 is connected to the G pole of the MOS transistor Q4 and the collector of the triode Q5, the D pole of the MOS transistor Q4 is connected to the extension, and the D pole of the MOS transistor Q6 is grounded through the resistor R8, the G pole of the MOS transistor Q6 is connected to the emitter of the triode Q5 and the pin No. 2 of the single chip microcomputer U1, the base of the triode Q5 is connected to one end of the resistor R6 and one end of the resistor R7, the other end of the resistor R7 is grounded, the other end of the resistor R6 is connected to the pin No. 1 of the food-grade U1, and the pin No. 3 of the single chip microcomputer U1 is connected to the pulse detection comparator module.
When the host sends information, pin 1 of the singlechip U1 outputs 5V high level, the high level is divided by the resistor R6 and the resistor R7 and then provides 2.5V voltage at the base electrode of the triode Q5, the host sends signals through pin 2 of the singlechip U1, when the high level of 5V is sent, the triode Q6 is conducted to the triode Q5 and is cut off, no voltage exists at the two ends of the resistor R5, the triode Q4 is cut off, the voltage of the SL wire is low level 0V, when the low level of 0V is sent, the triode Q6 is cut off, the triode Q5 is conducted in saturation, the two ends of the resistor R5 have 5V voltage, therefore, the triode Q4 is conducted in saturation, the voltage of the SL wire is high level 15V, after the host sends the information, in order to receive the information of the extension, pin 1 and pin 2 of the singlechip U1 output low level, therefore, the triodes Q6, Q5 and Q4 are all cut off, the SL wire is pulled up to 15V through the constant current source, and the resistor R8 is used for absorbing narrow pulses generated when the triodes Q4 and Q6 are conducted in turn.
In this embodiment: please refer to fig. 1, the extension includes resistance R9, diode D1, opto-coupler PH2, resistance R10, resistance R11, constant current source module is connected to resistance R9's one end, the pulse detects comparator module, send and control module, opto-coupler PH 1's third end, opto-coupler PH 1's fourth end, opto-coupler PH 2's second end, diode D1's negative pole is connected to resistance R9's the other end, diode D1's first end is connected to diode D1's positive pole, opto-coupler PH 2's first end, opto-coupler PH 2's third end, opto-coupler PH 1's second end is connected the signal transmission through resistance R10, received signal is connected to opto-coupler PH 2's fourth end, resistance R11's one end, resistance R11's other end ground connection.
The SL line is pulled up to 15V by a constant current source, a receiving part of each extension consists of a diode D1, a resistor R9, a resistor R11 and an optical coupler PH2 (the optical coupler internally comprises a light emitting diode and a phototriode), and the current I provided by the constant current source 3 After being shunted by N extension receiving part circuits, U is generated in each extension through a resistor R9, a diode D1 and an input end diode branch of an optocoupler PH2 SL1 ＝R 9 I 3 /N+U D1 +U D Pressure drop of > 11V (U) D Input end diode drop U with PH2 as 1V D1 =10V is the regulated value of the voltage regulator tube D1), since D1 always satisfies U regardless of how many extension sets are connected in parallel SL1 >Under the condition of 11V, the transmitting part of the slave unit transmits information of the slave unit by using the voltage, so that the slave unit does not need an independent operating power supply.
When the host sends information, the high level voltage is 15V and far larger than 11V, so that the current generated by the current limiting resistor R9 enables the output end of the optocoupler PH2 to be in saturated conduction, high levels are generated at two ends of the resistor R11 and provided for the receiving ends of the extension sets, and when the host sends voltage of 0V, the high level voltage is far smaller than 11V, so that the diode D1 and the optocoupler PH2 are cut off, and 0V low levels are generated at two ends of the resistor R11 and provided for the receiving ends of the extension sets; the transmitting part of each extension consists of a resistor R10 and an optocoupler PH1, and the triodes Q4 and Q6 are actively disconnected after the host transmits information each time, so that a SL line is made to provide U SL >11V voltage is supplied to the extension set, when the extension set sends low level, the diode at the input end of the optical coupler PH1 generates current through the current limiting resistor R10, so that the current I of the constant current source is conducted by saturation of the output end of the optical coupler PH1 3 And the bypass provides a low level of 0.5V on the SL line, and when the extension sends a high level of 5V, the diode at the input end of the optical coupler PH1 is cut off, so that the output end of the optical coupler PH1 is also cut off to provide a high level of more than 11V on the SL line for the host to receive information.
The receiving and transmitting part of the extension does not need a special chip and an independent working power supply (power supply is realized through an SL line), only two optocouplers are used for completing the receiving and transmitting tasks, and the extension has a simple circuit and low cost.
The utility model discloses a theory of operation is: host computer and extension carry out information transmission, extension and host computer construction communication, and the extension is equipped with a plurality ofly, and the host computer includes: the constant current source module supplies a constant current source for the extension set; the pulse detection comparator module receives the information that the extension set changes the constant current source and sends the information to the sending and control module; the sending and control module sends information to the extension set by changing the size of the constant current source; and receiving extension information.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments may be combined as appropriate by one of ordinary skill in the art to form other embodiments as will be apparent to those of skill in the art from the description herein.
Claims (5)
1. A2-wire mode transceiving communication circuit without an independent working power supply is characterized in that:
this 2 line mode receiving and dispatching communication circuit that need not independent operating power supply includes:
the host is used for carrying out information transmission with the extension;
the extension sets are used for establishing communication with the host, and the number of the extension sets is multiple;
the host computer includes:
the constant current source module is used for supplying constant current sources to the extension sets;
the pulse detection comparator module is used for receiving the information of the extension set changing the constant current source and sending the information to the sending and control module;
the sending and controlling module is used for sending information to the extension set by changing the size of the constant current source; and receiving extension information;
the constant current source module is connected with the extension, the extension is connected with the pulse detection comparator module and the sending and control module, and the pulse detection comparator module is connected with the sending and control module.
2. The 2-wire mode transceiving communication circuit without an independent operating power supply according to claim 1, wherein the constant current source module comprises a resistor R1, a resistor R3, a transistor Q1 and a transistor Q2, wherein one end of the resistor R1 is connected with a 15V voltage and an emitter of the transistor Q1, the other end of the resistor R1 is connected with a base of the transistor Q1 and an emitter of the transistor Q3, a collector of the transistor Q1 is connected with a base of the transistor Q3 and one end of the resistor R3, the other end of the resistor R3 is grounded, and the collector of the transistor Q3 is connected with an extension set.
3. The 2-wire mode transceiving communication circuit without an independent operating power supply of claim 1, wherein the pulse detection comparator module comprises a resistor R2, a transistor Q2 and a resistor R4, wherein an emitter of the transistor Q2 is connected with a voltage of 5V, a base of the transistor Q2 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with the extension, a collector of the transistor Q2 is connected with one end of the resistor R4 and the transmission and control module, and the other end of the resistor R4 is grounded.
4. The 2-wire mode transceiving communication circuit without an independent operating power supply according to claim 1, wherein the transmitting and controlling module comprises a single chip microcomputer U1, an MOS transistor Q4, an MOS transistor Q6, a triode Q5, a resistor R6, a resistor R7 and a resistor R8, the model of the single chip microcomputer U1 is MK6A12P, the S pole of the MOS transistor Q4 is connected with one end of the resistor R5 and 15V voltage, the other end of the resistor R5 is connected with the G pole of the MOS transistor Q4 and the collector of the triode Q5, the D pole of the MOS transistor Q4 is connected with the extension and the D pole of the MOS transistor Q6, the S pole of the MOS transistor Q6 is grounded through the resistor R8, the G pole of the MOS transistor Q6 is connected with the emitter of the triode Q5 and the No. 2 pin of the single chip microcomputer U1, the base of the triode Q5 is connected with one end of the resistor R6 and one end of the resistor R7, the other end of the resistor R7 is grounded, the other end of the resistor R6 is connected with the No. 1 pin of the food-grade U1, and the No. 3 pin of the single chip microcomputer U1 is connected with the pulse detection comparator module.
5. The 2-wire mode transceiving communication circuit without an independent working power supply according to any one of claims 1 to 4, wherein the extension comprises a resistor R9, a diode D1, an optical coupler PH2, a resistor R10 and a resistor R11, a constant current source module is connected to one end of the resistor R9, a pulse detection comparator module, a sending and control module, a third end of the optical coupler PH1, a fourth end of the optical coupler PH1 and a second end of the optical coupler PH2, the other end of the resistor R9 is connected with a negative electrode of the diode D1, a first end of the optical coupler PH1 is connected to a positive electrode of the diode D1, a first end of the optical coupler PH2 and a third end of the optical coupler PH2, the second end of the optical coupler PH1 is connected with a sending signal through the resistor R10, a fourth end of the optical coupler PH2 is connected with a receiving signal, one end of the resistor R11, and the other end of the resistor R11 is grounded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223033002.XU CN218648812U (en) | 2022-11-14 | 2022-11-14 | 2-wire mode transceiving communication circuit without independent working power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223033002.XU CN218648812U (en) | 2022-11-14 | 2022-11-14 | 2-wire mode transceiving communication circuit without independent working power supply |
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| CN218648812U true CN218648812U (en) | 2023-03-17 |
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| CN202223033002.XU Active CN218648812U (en) | 2022-11-14 | 2022-11-14 | 2-wire mode transceiving communication circuit without independent working power supply |
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