CN218041387U - Ammeter current loop communication circuit - Google Patents
Ammeter current loop communication circuit Download PDFInfo
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- CN218041387U CN218041387U CN202222105070.6U CN202222105070U CN218041387U CN 218041387 U CN218041387 U CN 218041387U CN 202222105070 U CN202222105070 U CN 202222105070U CN 218041387 U CN218041387 U CN 218041387U
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Abstract
The utility model relates to a current loop communication technical field just discloses an ammeter current loop communication circuit, and it includes that second photoelectricity occasionally holds ware OP10, the first pin of second photoelectricity occasionally ware OP10 is connected with power VCC1; a second pin of the second opto-electronic isolator OP10 is connected to one end of a resistor R51, the other end of the resistor R51 is connected to one end of a transmitting terminal TXD and one end of a capacitor C22, and the other end of the capacitor C22 is grounded; the third pin of the second photovoltaic generator OP10 is connected to one end of a resistor R57, a resistor R58 and a capacitor C9, respectively, and the E-pole of the transistor Q7 and the other end of the resistor R58 are grounded simultaneously. The utility model discloses the circuit is simple, stable, with low costs, and through the change of sending end TXD and binding post J12's second pin level, binding post J12's first pin and receiving terminal RXD also change thereupon, can accomplish the transmission switching and the communication of equidimension signal not.
Description
Technical Field
The utility model relates to an ammeter technical field specifically is an ammeter electric current loop communication circuit.
Background
The current loop communication circuit has the advantages of convenience in installation and low cost, and is widely applied to communication of indoor units and outdoor units of variable frequency air conditioners at present. Under the normal condition, the interior external machine communication logic of variable frequency air conditioner is after power input through partial pressure, rectification and steady voltage with exchanging high voltage conversion and exchanging direct current low voltage output to keeping apart the opto-coupler, then through keeping apart the opto-coupler, becomes current loop communication circuit with interior external machine owner chip, and this just causes the circuit complicacy, and is with high costs, is difficult to switch according to not equidimension signal.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an ammeter electric current loop communication circuit to solve the problem that exists among the prior art.
In order to achieve the purpose, the utility model adopts the technical proposal that: an ammeter current loop communication circuit is provided, which comprises a second photoelectric isolator OP10, wherein a first pin of the second photoelectric isolator OP10 is connected with a power supply VCC1;
a second pin of the second optical isolator OP10 is connected to one end of a resistor R51, the other end of the resistor R51 is connected to one end of a transmitting terminal TXD and one end of a capacitor C22, and the other end of the capacitor C22 is grounded;
a third pin of the second photovoltaic generator OP10 is respectively connected with one end of a resistor R57, one end of a resistor R58 and one end of a capacitor C9, the other end of the resistor R58 is grounded, the other ends of the resistor R57 and the capacitor C9 are both connected with a terminal B of a triode Q7, and a terminal E of the triode Q7 and the other end of the resistor R58 are simultaneously grounded;
a fourth pin of the second optical power isolator OP10 is connected with one end of a resistor R50, and a power supply VCC2 is connected between the fourth pin of the second optical power isolator OP10 and the resistor R50;
the other end of the resistor R50 is connected with a C pole of a triode Q7 and a B pole of a triode Q200 respectively, an E pole of the triode Q200 is grounded, a C pole of the triode Q200 is connected with one end of a resistor R200, and the resistor R200 is connected with a B pole of a triode Q201;
the E pole of the triode Q201 is connected with +12V voltage, the C pole of the triode Q201 is connected with the cathode of the transient suppression diode TVS200 and one end of the thermistor PTC200, and the other end of the thermistor PTC200 is connected with the first pin of the connecting terminal J12;
a second pin of the connection terminal J12 is connected to a cathode of the transient suppression diode TVS201, an end of the resistor R205, an end of the resistor R204, and an anode of the transient suppression diode TVS200 in sequence, and then connected to an end of the resistor R203;
the anode of the transient suppression diode TVS201, the other end of the resistor R205, and the other end of the resistor R204 are simultaneously grounded;
the other end of the resistor R203 is connected with the pole B of the triode Q202, the pole E of the triode Q202 is grounded, the pole C of the triode Q202 is connected with one end of the resistor R202, and the other end of the resistor R202 is connected with a first pin of a first photoelectric coupler OP 1;
a second pin of the first photoelectric coupler OP1 is connected with a power supply VCC2;
a third pin of the first photoelectric coupler OP1 is connected with one end of a resistor R16, and a power supply VCC1 is connected between the third pin of the first photoelectric coupler OP1 and one end of the resistor R16; the other end of the resistor R16, the C pole of the triode Q6 and one end of the capacitor C8 are connected with a receiving end RXD;
a fourth pin of the first photoelectric coupler OP1 is respectively connected with one end of a resistor R46, one end of a resistor R45 and one end of a capacitor C7, and the other end of the resistor R45 and the other end of the capacitor C7 are simultaneously connected with a pole B of the triode Q6; the other end of the resistor R46 is connected with the E pole of the triode Q6 and then is grounded.
Preferably, in the present technical solution, the transient suppression diode TVS201, the resistor R205, and the resistor R204 are parallel circuits;
preferably, in the present technical solution, the resistor R45 and the capacitor C7 belong to a parallel connection circuit.
Compared with the prior art, the utility model discloses possess following beneficial effect:
the utility model discloses the circuit is simple, stable, with low costs, and through the change of sending end TXD and binding post J12's second pin level, binding post J12's first pin and receiving terminal RXD also change thereupon, can accomplish the transmission switching and the communication of equidimension signal not.
Drawings
Fig. 1 is a schematic diagram of the current loop communication circuit of the utility model.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely 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, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, a current loop communication circuit of an electric meter includes a second photo interrupter OP10, a first pin of the second photo interrupter OP10 is connected to a power source VCC1;
a second pin of the second optical-electrical isolator OP10 is connected to one end of a resistor R51, the other end of the resistor R51 is connected to one end of a transmitting terminal TXD and one end of a capacitor C22, and the other end of the capacitor C22 is grounded;
a third pin of the second photovoltaic generator OP10 is respectively connected with one end of a resistor R57, one end of a resistor R58 and one end of a capacitor C9, the other end of the resistor R58 is grounded, the other ends of the resistor R57 and the capacitor C9 are both connected with the node B of the triode Q7, and the pole E of the triode Q7 and the other end of the resistor R58 are grounded at the same time;
the fourth pin of the second optical isolator OP10 is connected to one end of a resistor R50, and a power supply VCC2 is connected between the fourth pin of the second optical isolator OP10 and the resistor R50;
the other end of the resistor R50 is connected with the C pole of the triode Q7 and the B pole of the triode Q200 respectively, the E pole of the triode Q200 is grounded, the C pole of the triode Q200 is connected with one end of the resistor R200, and the resistor R200 is connected with the B pole of the triode Q201;
the E pole of the triode Q201 is connected with +12V voltage, the C pole of the triode Q201 is connected with the cathode of the transient suppression diode TVS200 and one end of the thermistor PTC200, the other end of the thermistor PTC200 is connected with the first pin of the connecting terminal J12, and the second pin of the connecting terminal J12 is connected with the cathode of the transient suppression diode TVS201, one end of the resistor R205, one end of the resistor R204 and the anode of the transient suppression diode TVS200 in sequence and then connected with one end of the resistor R203; the anode of the transient suppression diode TVS201, the other end of the resistor R205, and the other end of the resistor R204 are simultaneously grounded; the transient suppression diode TVS201, the resistor R205 and the resistor R204 are distributed in a parallel circuit;
the other end of the resistor R203 is connected with the pole B of the triode Q202, the pole E of the triode Q202 is grounded, the pole C of the triode Q202 is connected with one end of the resistor R202, and the other end of the resistor R202 is connected with a first pin of a first photoelectric coupler OP 1;
a second pin of the first photoelectric coupler OP1 is connected with a power supply VCC2;
a third pin of the first photoelectric coupler OP1 is connected with one end of a resistor R16, and a power supply VCC1 is connected between the third pin of the first photoelectric coupler OP1 and one end of the resistor R16; the other end of the resistor R16, the C pole of the triode Q6 and one end of the capacitor C8 are connected with a receiving end RXD together;
a fourth pin of the first photoelectric coupler OP1 is respectively connected with one end of a resistor R46, one end of a resistor R45 and one end of a capacitor C7, and the other end of the resistor R45 and the other end of the capacitor C7 are simultaneously connected with a pole B of the triode Q6; the resistor R45 and the capacitor C7 belong to a parallel connection circuit; the other end of the resistor R46 is connected to the E-pole of the transistor Q6 and then grounded.
In the present embodiment, the thermistor PTC200 is preferably selected from the specification model of SPMZ9 (30-60).
In this embodiment, preferably, the resistance of the resistor R51 is 1k Ω, the resistance of the resistor 50 is 5.1k Ω, the resistance of the resistor R57 is 2.2k Ω, the resistance of the resistor R58 is 1k Ω, the resistance of the resistor R200 is 18k Ω, the resistance of the resistor R205 is 30 Ω, the resistance of the resistor R204 is 30 Ω, the resistance of the resistor R203 is 1.5k Ω, the resistance of the chinese medical bone setting of the resistor R202 is 510 Ω, the resistance of the resistor R16 is 2.2k Ω, the resistance of the resistor R45D is 2.2k Ω, and the resistance of the resistor R46 is 510 Ω.
In the present embodiment, it is preferable that the capacitor C22 is selected to have a specification of 100pF/50V, the capacitor C9 is selected to have a specification of 10nF/50V, and the capacitor C7 is selected to have a specification of 10nF/50V.
In this embodiment, the specification and model of the first photo coupler OP1 and the second photo coupler OP10 are preferably LTV-816S-TA1-D3-TX.
In this embodiment, preferably, the specification model of the transient suppression diode TVS200 is SMBJ20CA; the specification model of the transient suppression diode TVS201 is SMBJ6.5CA.
In this embodiment, preferably, the specification models of the transistor Q6, the transistor Q7, the transistor Q200, and the transistor Q203 are all L8050; the specification model of the triode Q201 is L8550.
In the present embodiment, power supply VCC1 is preferably 3 to 5V, and VCC2 is preferably 10 to 15V.
The working principle of the ammeter current loop communication circuit of the embodiment is as follows: when the transmitting end TXD is at a low level, the second photoelectric coupler OP10 is turned on, the triode Q7 is turned on, the triode Q200 is cut off, the triode Q201 is cut off, and the first pin a of the connecting terminal J12 outputs a low level; when the transmitting end TXD is at a high level, the second photocoupler OP10 is not conducted, the triode Q7 is cut off, the triode Q200 is conducted, the triode Q201 is conducted, and the first pin a of the connecting terminal J12 outputs a high level; in the above, as the TXD changes in high/low level, the first pin a of the output terminal J12 follows the output high/low level accordingly, i.e. the signal transmission is completed.
When the second pin B of the connection terminal J12 is at a low level, the triode Q202 is turned off, the first photoelectric coupler OP1 is not turned on, the triode Q6 is turned off, and the receiving terminal RXD outputs a high level;
when the second pin of the connection terminal J12 is at a high level, the transistor Q202 is turned on, the first photoelectric coupler OP1 is turned on, the transistor Q6 is turned on, and the receiving terminal RXD outputs a low level.
In the above, as the high/low level of RXD changes, the second pin B of the output terminal J12 correspondingly follows the output low/high level, i.e. the signal reception is completed.
Therefore, with the level change of the transmitting terminal TXD and the second pin of the connecting terminal J12, the first pin of the connecting terminal J12 and the receiving terminal RXD change accordingly, and the signal transmission can be completed.
To sum up, the utility model discloses the circuit is simple, the cost is first, stable, and through the change of sending terminal TXD and binding post J12's second pin level, binding post J12's first pin and receiving terminal RXD also change thereupon, can accomplish not transmission switching and communication of equidimension signal.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. The utility model provides an ammeter current loop communication circuit which characterized in that: the photoelectric converter comprises a second photoelectric converter OP10, wherein a first pin of the second photoelectric converter OP10 is connected with a power supply VCC1;
a second pin of the second opto-electronic isolator OP10 is connected to one end of a resistor R51, the other end of the resistor R51 is connected to one end of a transmitting terminal TXD and one end of a capacitor C22, and the other end of the capacitor C22 is grounded;
a third pin of the second opto-electronic isolator OP10 is connected to one end of a resistor R57, one end of a resistor R58 and one end of a capacitor C9, the other end of the resistor R58 is grounded, the other ends of the resistor R57 and the capacitor C9 are both connected to the node B of a triode Q7, and the pole E of the triode Q7 and the other end of the resistor R58 are grounded at the same time;
a fourth pin of the second optical power isolator OP10 is connected with one end of a resistor R50, and a power supply VCC2 is connected between the fourth pin of the second optical power isolator OP10 and the resistor R50;
the other end of the resistor R50 is connected with a C pole of a triode Q7 and a B pole of a triode Q200 respectively, an E pole of the triode Q200 is grounded, a C pole of the triode Q200 is connected with one end of a resistor R200, and the resistor R200 is connected with a B pole of a triode Q201;
the E pole of the triode Q201 is connected with +12V voltage, the C pole of the triode Q201 is connected with the cathode of the transient suppression diode TVS200 and one end of the thermistor PTC200, and the other end of the thermistor PTC200 is connected with the first pin of the connecting terminal J12;
a second pin of the connection terminal J12 is connected to a cathode of the transient suppression diode TVS201, an end of the resistor R205, an end of the resistor R204, and an anode of the transient suppression diode TVS200 in sequence, and then connected to an end of the resistor R203;
the anode of the transient suppression diode TVS201, the other end of the resistor R205, and the other end of the resistor R204 are simultaneously grounded;
the other end of the resistor R203 is connected with the pole B of the triode Q202, the pole E of the triode Q202 is grounded, the pole C of the triode Q202 is connected with one end of the resistor R202, and the other end of the resistor R202 is connected with a first pin of a first photoelectric coupler OP 1;
a second pin of the first photoelectric coupler OP1 is connected with a power supply VCC2;
a third pin of the first photoelectric coupler OP1 is connected with one end of a resistor R16, and a power supply VCC1 is connected between the third pin of the first photoelectric coupler OP1 and one end of the resistor R16; the other end of the resistor R16, the C pole of the triode Q6 and one end of the capacitor C8 are connected with a receiving end RXD;
a fourth pin of the first photoelectric coupler OP1 is respectively connected with one end of a resistor R46, one end of a resistor R45 and one end of a capacitor C7, and the other end of the resistor R45 and the other end of the capacitor C7 are simultaneously connected with a pole B of the triode Q6; the other end of the resistor R46 is connected with the E pole of the triode Q6 and then is grounded.
2. An ammeter current loop communication circuit as defined in claim 1, wherein: the transient suppression diode TVS201, the resistor R205, and the resistor R204 are parallel circuits.
3. An ammeter current loop communication circuit as defined in claim 2, wherein: the resistor R45 and the capacitor C7 belong to a parallel connection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222105070.6U CN218041387U (en) | 2022-08-10 | 2022-08-10 | Ammeter current loop communication circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222105070.6U CN218041387U (en) | 2022-08-10 | 2022-08-10 | Ammeter current loop communication circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218041387U true CN218041387U (en) | 2022-12-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222105070.6U Active CN218041387U (en) | 2022-08-10 | 2022-08-10 | Ammeter current loop communication circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218041387U (en) |
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2022
- 2022-08-10 CN CN202222105070.6U patent/CN218041387U/en active Active
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