CN114704917A - Zero-live line communication circuit, communication system and air conditioning system - Google Patents

Zero-live line communication circuit, communication system and air conditioning system Download PDF

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Publication number
CN114704917A
CN114704917A CN202210442006.9A CN202210442006A CN114704917A CN 114704917 A CN114704917 A CN 114704917A CN 202210442006 A CN202210442006 A CN 202210442006A CN 114704917 A CN114704917 A CN 114704917A
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China
Prior art keywords
resistor
communication
input end
comparator
voltage
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CN202210442006.9A
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Chinese (zh)
Inventor
于洪涛
郑嘉良
黄银彬
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN202210442006.9A priority Critical patent/CN114704917A/en
Publication of CN114704917A publication Critical patent/CN114704917A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/56—Remote control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Telephonic Communication Services (AREA)

Abstract

The invention discloses a zero-live line communication circuit, a communication system and an air conditioning system. Wherein, above-mentioned zero live wire communication circuit includes: the input end of the logic operation module is connected with the input end of the communication loop, the output end of the logic operation module is connected with the control end of the first switching tube, and the logic operation module is used for outputting a control signal according to the voltage input by the input end of the communication loop; the input end of the first switch tube is connected with the control end of the current adjusting module, and the output end of the first switch tube is grounded and used for changing the on-off state of the first switch tube according to the control signal so as to control two switch branches which are arranged in parallel in the current adjusting module to be switched on and switched off, and further adjust the current of the communication loop; and the current adjusting module is arranged between the input end and the output end of the communication loop. By the aid of the method and the device, when the voltage of the mains supply is greatly reduced, the current of the communication loop is controlled to be increased, and communication quality is guaranteed.

Description

Zero-live line communication circuit, communication system and air conditioning system
Technical Field
The invention relates to the technical field of electronic communication, in particular to a zero-live line communication circuit, a zero-live line communication system and an air conditioning system.
Background
At present, communication between different communication bodies of household electrical appliance systems (such as air conditioning systems) generally adopts a zero-live line communication mode. The communication mode is relatively simple, a special communication chip is not needed, the communication signal forms a signal communication loop through a COM line and a zero line, and the use cost of hardware can be greatly reduced. However, when zero-live line communication is adopted, 220V alternating current is subjected to voltage division and rectification to obtain a voltage signal, a communication signal is loaded on the voltage signal, and the voltage signal is used as a medium between different communication bodies to transmit signals. If the mains voltage is unstable or disturbed, which causes the mains voltage value to be lower than 220V and the deviation to be large, the voltage value of the communication voltage signal is also greatly reduced, and then the current of the communication loop is reduced, thereby affecting the quality of the communication signal between the communication main bodies.
Aiming at the problem that the quality of communication signals is influenced due to the fact that the mains supply voltage is greatly reduced in the prior art, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a zero-live line communication circuit, a communication system and an air conditioning system, which aim to solve the problem that the quality of a communication signal is influenced due to the fact that the mains supply voltage is greatly reduced in the prior art.
In order to solve the above technical problem, the present invention provides a zero-live line communication circuit, wherein the circuit comprises:
the input end of the logic operation module is connected with the input end of the communication loop, the output end of the logic operation module is connected with the control end of the first switching tube, and the logic operation module is used for outputting a control signal according to the voltage input by the input end of the communication loop;
the input end of the first switch tube is connected with the control end of the current adjusting module, the output end of the first switch tube is grounded, and the first switch tube is used for changing the on-off state of the first switch tube according to the control signal so as to control two switch branches which are arranged in parallel in the current adjusting module to be switched on and switched off, and further adjust the current of the communication loop;
the current adjusting module is arranged between the input end and the output end of the communication loop.
Further, the current adjustment module includes:
the first switch branch comprises a second switch tube and a first resistor which are arranged in series;
the second switch branch comprises a third switch tube and a second resistor which are arranged in series;
the resistance value of the first resistor is larger than that of the second resistor, and the types of the second switch tube and the third switch tube are different.
Further, the second switching tube is a PNP switching tube, and the third switching tube is an NPN switching tube.
Further, the logic operation module comprises:
the first end of the first voltage division unit is connected with the input end of the communication loop, the second end of the first voltage division unit is grounded, and the third end of the first voltage division unit is connected with the non-inverting input end of the first comparator;
and the inverting input end of the first comparator inputs a first reference voltage, and the output end of the first comparator is connected with the control end of the first switching tube.
Further, the first voltage division unit includes:
the circuit comprises a third resistor and a fourth resistor which are arranged in series, wherein the third resistor is connected with the input end of the communication loop, the fourth resistor is grounded, and a line between the third resistor and the fourth resistor is connected with the non-inverting input end of the first comparator.
Further, the logic operation module further includes:
the first input end of the AND gate arithmetic unit is connected with the output end of the first comparator, the second input end of the AND gate arithmetic unit is connected with the output end of the second comparator, and the output end of the AND gate arithmetic unit is connected with the control end of the first switch tube;
the first end of the second voltage division unit is connected with a voltage source, the second end of the second voltage division unit is grounded, and the third end of the second voltage division unit is connected with the inverted input end of the second comparator;
and the non-inverting input end of the second comparator inputs a second reference voltage.
Further, the second voltage division unit includes:
the fifth resistor and the sixth resistor are connected in series, the fifth resistor is connected with the voltage source, the sixth resistor is grounded, a line between the fifth resistor and the sixth resistor is connected with the inverting input end of the second comparator, the fifth resistor is a constant value resistor, and the sixth resistor is the total resistor of the communication loop.
Further, the circuit further comprises:
the circuit comprises a seventh resistor and an eighth resistor which are connected in series, wherein the seventh resistor is connected with the output end of the logic operation module, the eighth resistor is grounded, and a line between the seventh resistor and the eighth resistor is connected with the control end of the first switching tube.
The invention also provides another zero-live wire communication circuit, which comprises:
the circuit comprises a ninth resistor and a tenth resistor which are arranged in series, wherein the ninth resistor is connected with the voltage source, the tenth resistor is grounded, a line between the ninth resistor and the tenth resistor is connected with the inverting input end of the comparator, the ninth resistor is a constant value resistor, and the tenth resistor is the total resistor of the communication loop;
the non-inverting input end of the comparator inputs reference voltage, and the output end of the comparator is connected with the switching tube;
the input end of the switching tube is connected with the control end of the current adjusting module, and the output end of the switching tube is grounded and used for changing the on-off state of the switching tube according to the control signal so as to control two switching branches which are arranged in parallel in the current adjusting module to be switched on and switched off and further adjust the current of the communication loop;
and the current adjusting module is arranged between the input end and the output end of the communication loop.
The invention also provides a communication system which comprises a first communication main body and a second communication main body and is characterized by also comprising the first zero-live line communication circuit, wherein the first communication main body is connected with the input end of the communication loop, and the second communication main body is connected with the output end of the communication loop.
The invention also provides another communication system which comprises a first communication main body and a second communication main body and is characterized by further comprising the second type of zero-live line communication circuit, wherein the first communication main body is connected with the input end of the communication loop, and the second communication main body is connected with the output end of the communication loop.
Further, the communication system is an air conditioning system, the first communication main body is an air conditioner internal unit, and the second communication main body is an air conditioner external unit.
By applying the technical scheme of the invention, the control signal is output through the logic operation module according to the voltage carried by the carrier signal input at the input end of the communication loop, and the switching conduction of two switch branches which are arranged in parallel in the current control module is controlled through the control signal, so that the current of the communication loop is adjusted, the current of the communication loop is controlled to be increased when the voltage of the mains supply is greatly reduced, and the communication quality is ensured.
Drawings
FIG. 1 is a block diagram of a zero-live line communication circuit according to an embodiment of the present invention;
FIG. 2 is a block diagram of a hot and cold wire communication circuit according to another embodiment of the present invention;
FIG. 3 is a block diagram of a hot and cold wire communication circuit according to yet another embodiment of the present invention;
fig. 4 is a block diagram of a hot and cold wire communication circuit according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the description of the invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "the plural" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe the resistors in the embodiments of the present invention, the resistors should not be limited to these terms. These terms are only used to distinguish between different resistances. For example, a first resistance may also be referred to as a second resistance, and similarly, a second resistance may also be referred to as a first resistance, without departing from the scope of embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an 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 article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
The present embodiment provides a hot and zero line communication circuit, and fig. 1 is a block diagram of a hot and zero line communication circuit according to an embodiment of the present invention, as shown in fig. 1, the hot and zero line communication circuit includes:
the input end of the logic operation module 10 is connected to the input end of the communication loop, the carrier signal formed by voltage division and rectification of 220V mains supply is input to the input end of the communication loop, the output end of the logic operation module 10 is connected to the control end (base) of the first switch tube Q1, and the logic operation module 10 is used for outputting a control signal according to the voltage Vt carried by the carrier signal input to the input end of the communication loop.
The input end (collector) of the first switching tube Q1 is connected to the control end of the current adjustment module 20, and the output end thereof is grounded, so as to change the on-off state thereof according to the control signal, and further control two parallel switching branches in the current adjustment module to be switched on, and further adjust the current of the communication loop; the current adjusting module 20 is disposed between the input end and the output end COM of the communication loop.
The zero-live line communication circuit of the embodiment is provided with the logic operation module 10, outputs a control signal according to the voltage Vt carried by a carrier signal input at the input end of the communication loop, controls the switching and conduction of two parallel switch branches in the current control module 20 through the control signal, and further adjusts the current of the communication loop, so that the current of the communication loop can be controlled to be increased when the voltage of the mains supply is greatly reduced, and the communication quality is ensured.
Example 2
In this embodiment, another live-wire communication circuit is provided, and fig. 2 is a structural diagram of a live-wire communication circuit according to another embodiment of the present invention, in order to implement switching conduction of two switch branches, as shown in fig. 2, the current adjustment module 20 includes: the first switching branch comprises a second switching tube Q2 and a first resistor R1 which are arranged in series; the second switching branch comprises a third switching tube Q3 and a second resistor R2 which are arranged in series; the resistance of the first resistor R1 is greater than that of the second resistor R2, the types of the second switch Q2 and the third switch Q3 are different, in an embodiment of the present invention, the first switch Q1 is a PNP switch, the second switch Q2 is a PNP switch, and the third switch Q3 is an NPN switch.
In order to output different control signals according to the magnitude of the voltage Vt carried by the carrier signal input at the input end of the communication loop, the logic operation module 10 includes: a first voltage division unit, a first end of which is connected with the input end of the communication loop, a second end of which is grounded, and a third end of which is connected with the non-inverting input end of a first comparator U1; the inverting input terminal of the first comparator U1 inputs the first reference voltage V01, and the output terminal thereof is connected to the control terminal of the first switch tube Q1.
Since the input voltage of the comparator cannot be too high, it is necessary to divide the voltage Vt carried by the carrier signal, and in order to implement the voltage division, the first voltage division unit includes: the circuit comprises a third resistor R3 and a fourth resistor R4 which are arranged in series, wherein the third resistor R3 is connected with the input end of the communication loop, the fourth resistor R4 is grounded, and a line between the third resistor R3 and the fourth resistor R4 is connected with the non-inverting input end of the first comparator U1.
In order to avoid the voltage inputted to the control terminal of the first switching tube Q1 being too large, the above-mentioned zero live wire communication circuit further includes: the circuit comprises a seventh resistor R7 and an eighth resistor R8 which are arranged in series, wherein the seventh resistor R7 is connected with the output end of the logic operation module 10, the eighth resistor R8 is grounded, a line between the seventh resistor R7 and the eighth resistor R8 is connected with the control end of the first switching tube Q1, and the seventh resistor R7 and the eighth resistor R8 are used for dividing the voltage output by the logic operation module 10.
The working principle of the above-mentioned zero line and live wire communication circuit is: when the voltage of the mains supply is about 220V, the voltage Vt carried by the carrier signal is within a normal range, and the voltage Vt is divided by the third resistor R3 and the fourth resistor R4 to obtain a voltage V1. The non-inverting input terminal of the first comparator U1 inputs a preset first reference voltage V01, and when the non-inverting input terminal is default, V1 is higher than V01, and the first comparator U1 outputs a high level "1" to drive the first switching tube Q1 to be turned on, so that the second switching tube Q2 is turned on, and the third switching tube Q3 is turned off. The second switch tube Q2 and the first resistor R1 are connected into the communication loop, and the resistance value of the first resistor R1 is large, so that the current of the communication loop in the communication circuit can be effectively reduced, and the device is prevented from being damaged by large current passing through the communication circuit.
When the voltage of the utility power is lower than 220V and the deviation is large, which causes the voltage Vt carried by the carrier signal to be greatly reduced, the voltage Vt carried by the carrier signal is divided by the third resistor R3 and the fourth resistor R4 to obtain a fluctuating voltage V1, at this time, V1 is lower than V01, U1 outputs a low level "0" to drive the first switch tube Q1 to be turned off, so that the second switch tube Q2 is turned off, and the third switch tube Q3 is turned on. The third switch tube Q3 and the second resistor R2 are connected into the communication loop, and the resistance value of the second resistor R2 is small, so that the situation that the current of the communication loop is too small due to too low working voltage can be effectively avoided, the reduction of the communication quality due to the reduction of the current of the communication loop is avoided, and the communication quality is improved.
Example 3
In this embodiment, another communication circuit for a hot and neutral line is provided, fig. 3 is a structural diagram of a communication circuit for a hot and neutral line according to another embodiment of the present invention, where, in the above, when the voltage of the utility power is greatly reduced, the current of the communication loop is reduced, and the communication quality is affected, and in practical applications, if the communication line is too long, the total resistance of the communication loop is increased, and the current of the communication loop is also reduced, and the communication quality is affected, so as to further ensure the communication quality, as shown in fig. 3, the logic operation module 10 further includes: an and gate operator U3, a first input terminal of which is connected to the output terminal of the first comparator U1, a second input terminal of which is connected to the output terminal of the second comparator U2, and an output terminal of which is connected to the control terminal of the first switch tube Q1; a first end of the second voltage division unit is connected with a voltage source (which can be 3.3V), a second end of the second voltage division unit is grounded, and a third end of the second voltage division unit is connected with an inverting input end of the second comparator U2; and a non-inverting input terminal of the second comparator U2 inputs a second reference voltage V02. The second voltage division unit includes: the circuit comprises a fifth resistor R5 and a sixth resistor R6 which are arranged in series, wherein the fifth resistor R5 is connected with a voltage source, the sixth resistor R6 is grounded, a line between the fifth resistor R5 and the sixth resistor R6 is connected with the inverting input end of the second comparator U2, the fifth resistor R5 is a fixed resistor, and the sixth resistor R6 is the total resistor of the communication loop.
The operation logic of the and gate operator is simply "0, that is, 0", that is, if any one of the first comparator U1 and the second comparator U2 outputs "0", the and gate operator U3 outputs "0", and if both the first comparator U1 and the second comparator U2 output "1", the and gate operator U3 outputs "1", based on the above, the operation principle of the zero fire line communication circuit of the present embodiment is as follows:
when the voltage of the mains supply is about 220V and the voltage Vt carried by the carrier signal is within the normal range, the voltage Vt carried by the carrier signal is divided by the third resistor R3 and the fourth resistor R4 to obtain a voltage V1. The non-inverting input terminal of the first comparator U1 inputs a preset first reference voltage V01, and by default, V1 is higher than V01, and the first comparator U1 outputs a high level "1", and in this case, in combination with the variation of the total resistance R6 of the communication loop, there are two cases:
the first method comprises the following steps: if the communication loop resistor R6 is normal at this time, the inverting input terminal of the second comparator U2 inputs the preset second reference voltage V02, the voltage of the voltage source is divided by the fifth resistor R5 and the sixth resistor R6 to obtain the voltage V2, the voltage V02 is higher than the voltage V2 in default, the second comparator U2 outputs a high level "1", the and gate operator U3 outputs a high level "1" to drive the first switching tube Q1 to be turned on, the second switching tube Q2 is turned on, and the third switching tube Q3 is turned off. The second switch tube Q2 and the first resistor R1 are connected into the communication loop, and the resistance of the first resistor R1 is large, so that the current of the communication loop in the communication circuit can be effectively reduced, and the device is prevented from being damaged by large current passing through the communication circuit.
And the second method comprises the following steps: if the total resistance R6 of the communication loop increases greatly (the total resistance of the communication loop increases with the increase of the length of the communication line), the voltage of the voltage source is divided by the fifth resistor R5 and the sixth resistor R6 to obtain a voltage V2, at this time, V2 is higher than V02, the second comparator U2 outputs a low level "0", the and gate operator U3 outputs a low level "0" to drive the first switch tube Q1 to be turned off, so that the second switch tube Q2 is turned off, and the third switch tube Q3 is turned on. The third switch tube Q3 and the second resistor R2 are connected into the communication loop, and the resistance value of the second resistor R2 is small, so that the situation that the current of the communication loop is too small due to the increase of the total resistance of the communication loop can be effectively avoided, the reduction of the communication quality due to the reduction of the current of the communication loop is avoided, and the communication quality is improved.
When the voltage Vt carried by the carrier signal is greatly reduced due to larger deviation and the voltage of the utility power is lower than 220V, the voltage Vt carried by the carrier signal is divided by the third resistor R3 and the fourth resistor R4 to obtain a fluctuated voltage V1, at this time, V1 is lower than V01, U1 outputs a low level "0", at this time, no matter the second comparator U2 outputs a low level "0" or a high level "1", the and gate operator U3 outputs a low level "0", the first switching tube Q1 is driven to be turned off, so that the second switching tube Q2 is turned off, the third switching tube Q3 is turned on, the third switching tube Q3 and the second resistor R2 are connected into the communication loop, the resistance of the second resistor R2 is smaller, the situation that the current of the communication loop is too small can be effectively avoided, the situation that the communication quality is reduced due to the reduction of the current of the communication loop is avoided, and the communication quality is improved.
Example 4
In this embodiment, another live wire and zero wire communication circuit is provided, and fig. 4 is a structural diagram of a live wire and zero wire communication circuit according to another embodiment of the present invention, as shown in fig. 4, the live wire and zero wire communication circuit includes:
a ninth resistor R9 and a tenth resistor R10 which are arranged in series, wherein the ninth resistor R9 is connected with a voltage source, the tenth resistor R10 is grounded, a line between the ninth resistor R9 and the tenth resistor R10 is connected with the inverting input end of the comparator, the ninth resistor R9 is a constant value resistor, and the tenth resistor R10 is the total resistor of the communication loop; a comparator U, the non-inverting input end of which inputs the reference voltage V0, and the output end of which is connected with the first switch tube Q1; the input end of the first switching tube Q1 is connected with the control end of the current adjusting module, and the output end of the first switching tube Q1 is grounded and is used for changing the on-off state of the first switching tube according to a control signal so as to control two switching branches which are arranged in parallel in the current adjusting module to be switched on and switched off, and further adjust the current of the communication loop; and the current adjusting module is arranged between the input end and the output end of the communication loop. The specific structure of the current adjustment module is the same as that of the embodiment, and includes: the first switching branch comprises a second switching tube Q2 and a first resistor R1 which are arranged in series; the second switching branch comprises a third switching tube Q3 and a second resistor R2 which are arranged in series; the resistance value of the first resistor R1 is greater than that of the second resistor R2, and the types of the second switching tube Q2 and the third switching tube Q3 are different, specifically, the first switching tube Q1 is a PNP type switching tube, the second switching tube Q2 is a PNP type switching tube, and the third switching tube Q3 is an NPN type switching tube.
The working principle of the zero-live line communication circuit of the embodiment is as follows:
when the total resistance R10 of the communication loop is a normal value, a preset reference voltage V0 is input to the inverting input terminal of the comparator U, the voltage of the voltage source is divided by the ninth resistor R9 and the tenth resistor R10 to obtain a voltage V, V0 is higher than V in default, the comparator U outputs a high level "1" to drive the first switch tube Q1 to be turned on, so that the second switch tube Q2 is turned on, and the third switch tube Q3 is turned off. The second switch tube Q2 and the first resistor R1 are connected into the communication loop, and the resistance of the first resistor R1 is large, so that the current of the communication loop in the communication circuit can be effectively reduced, and the device is prevented from being damaged by large current passing through the communication circuit.
When the total resistance R10 of the communication loop increases to a larger extent, the voltage of the voltage source is divided by the ninth resistor R9 and the tenth resistor R10 to obtain the voltage V, at this time, V is higher than V0, the comparator U outputs a low level "0" to drive the first switching tube Q1 to be turned off, so that the second switching tube Q2 is turned off, and the third switching tube Q3 is turned on. The third switch tube Q3 and the second resistor R2 are connected into the communication loop, and the resistance value of the second resistor R2 is small, so that the situation that the current of the communication loop is too small due to the increase of the total resistance of the communication loop can be effectively avoided, the reduction of the communication quality due to the reduction of the current of the communication loop is avoided, and the communication quality is improved.
Example 5
This embodiment provides a communication system, which includes a first communication main body and a second communication main body, and is characterized by further including any one of the firewire and null line communication circuits in embodiments 1 to 4 above, for improving the communication quality between the first communication main body and the second communication main body. The first communication main body is connected with the input end of the communication loop, and the second communication main body is connected with the output end of the communication loop. In this embodiment, the communication system is an air conditioning system, the first communication main body is an air conditioner internal unit, and the second communication main body is an air conditioner external unit.
The above-described embodiments of the apparatus are merely illustrative, wherein the modules described as separate parts may or may not be physically separate, and the parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (12)

1. A hot and cold wire communication circuit, said circuit comprising:
the input end of the logic operation module is connected with the input end of the communication loop, the output end of the logic operation module is connected with the control end of the first switching tube, and the logic operation module is used for outputting a control signal according to the voltage input by the input end of the communication loop;
the input end of the first switch tube is connected with the control end of the current adjusting module, and the output end of the first switch tube is grounded and used for changing the on-off state of the first switch tube according to the control signal so as to control two switch branches which are arranged in parallel in the current adjusting module to be switched on and switched off, and further adjust the current of the communication loop;
the current adjusting module is arranged between the input end and the output end of the communication loop.
2. The zero live line communication circuit according to claim 1, wherein the current regulation module comprises:
the first switch branch comprises a second switch tube and a first resistor which are arranged in series;
the second switch branch comprises a third switch tube and a second resistor which are arranged in series;
the resistance value of the first resistor is larger than that of the second resistor, and the types of the second switch tube and the third switch tube are different.
3. The zero-live line communication circuit according to claim 2, wherein the second switching tube is a PNP switching tube, and the third switching tube is an NPN switching tube.
4. The zero-live line communication circuit according to claim 1, wherein the logic operation module comprises:
the first end of the first voltage division unit is connected with the input end of the communication loop, the second end of the first voltage division unit is grounded, and the third end of the first voltage division unit is connected with the non-inverting input end of the first comparator;
and the inverting input end of the first comparator inputs a first reference voltage, and the output end of the first comparator is connected with the control end of the first switching tube.
5. The zero live line communication circuit according to claim 4, wherein the first voltage division unit comprises:
the circuit comprises a third resistor and a fourth resistor which are connected in series, wherein the third resistor is connected with the input end of the communication loop, the fourth resistor is grounded, and a line between the third resistor and the fourth resistor is connected with the non-inverting input end of the first comparator.
6. The zero live wire communication circuit according to claim 4, wherein the logic operation module further comprises:
the first input end of the AND gate arithmetic unit is connected with the output end of the first comparator, the second input end of the AND gate arithmetic unit is connected with the output end of the second comparator, and the output end of the AND gate arithmetic unit is connected with the control end of the first switch tube;
a first end of the second voltage division unit is connected with a voltage source, a second end of the second voltage division unit is grounded, and a third end of the second voltage division unit is connected with an inverted input end of the second comparator;
and the non-inverting input end of the second comparator inputs a second reference voltage.
7. The zero live line communication circuit according to claim 6, wherein the second voltage division unit comprises:
the fifth resistor and the sixth resistor are connected in series, the fifth resistor is connected with the voltage source, the sixth resistor is grounded, a line between the fifth resistor and the sixth resistor is connected with the inverting input end of the second comparator, the fifth resistor is a constant value resistor, and the sixth resistor is the total resistor of the communication loop.
8. The zero-live line communication circuit according to claim 1, further comprising:
the circuit comprises a seventh resistor and an eighth resistor which are connected in series, wherein the seventh resistor is connected with the output end of the logic operation module, the eighth resistor is grounded, and a line between the seventh resistor and the eighth resistor is connected with the control end of the first switching tube.
9. A hot and zero line communication circuit, the circuit comprising:
the circuit comprises a ninth resistor and a tenth resistor which are arranged in series, wherein the ninth resistor is connected with the voltage source, the tenth resistor is grounded, a line between the ninth resistor and the tenth resistor is connected with the inverting input end of the comparator, the ninth resistor is a constant value resistor, and the tenth resistor is the total resistor of the communication loop;
the non-inverting input end of the comparator inputs reference voltage, and the output end of the comparator is connected with the switching tube;
the input end of the switching tube is connected with the control end of the current adjusting module, and the output end of the switching tube is grounded and used for changing the on-off state of the switching tube according to the control signal so as to control two switching branches which are arranged in parallel in the current adjusting module to be switched on and switched off and further adjust the current of the communication loop;
the current adjusting module is arranged between the input end and the output end of the communication loop.
10. A communication system comprising a first communication body and a second communication body, further comprising the hot wire communication circuit of claim 9, wherein the first communication body is connected to an input of the communication loop, and the second communication body is connected to an output of the communication loop.
11. A communication system comprising a first communication body and a second communication body, and further comprising the hot and cold wire communication circuit of any one of claims 1 to 8, wherein the first communication body is connected to an input of the communication loop, and the second communication body is connected to an output of the communication loop.
12. The communication system according to claim 9 or 10, wherein the communication system is an air conditioning system, the first communication main body is an air conditioner indoor unit, and the second communication main body is an air conditioner outdoor unit.
CN202210442006.9A 2022-04-25 2022-04-25 Zero-live line communication circuit, communication system and air conditioning system Pending CN114704917A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210442006.9A CN114704917A (en) 2022-04-25 2022-04-25 Zero-live line communication circuit, communication system and air conditioning system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210442006.9A CN114704917A (en) 2022-04-25 2022-04-25 Zero-live line communication circuit, communication system and air conditioning system

Publications (1)

Publication Number Publication Date
CN114704917A true CN114704917A (en) 2022-07-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210442006.9A Pending CN114704917A (en) 2022-04-25 2022-04-25 Zero-live line communication circuit, communication system and air conditioning system

Country Status (1)

Country Link
CN (1) CN114704917A (en)

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