CN112696742B - Air conditioner - Google Patents

Air conditioner Download PDF

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Publication number
CN112696742B
CN112696742B CN202110141525.7A CN202110141525A CN112696742B CN 112696742 B CN112696742 B CN 112696742B CN 202110141525 A CN202110141525 A CN 202110141525A CN 112696742 B CN112696742 B CN 112696742B
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Prior art keywords
substrate
voltage
circuit
signal line
communication
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CN112696742A (en
Inventor
陶淦
何成军
林文涛
刘强
赵晓青
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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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
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
    • F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
    • 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
    • F24F11/88—Electrical aspects, e.g. circuits
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0423—Input/output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • H02M1/092—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices the control signals being transmitted optically

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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)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The present invention relates to an air conditioner, wherein a first indoor unit comprises: a first substrate having a first voltage and a first forward diode; the first communication loop comprises a first driving circuit and a first optical coupling circuit; the second indoor unit includes: a second substrate having a second voltage and a second forward diode, a difference between the first voltage and the second voltage being greater than 2V; a second communication loop, comprising: a second driving circuit driven by the second substrate; the anode of the voltage stabilizing diode is connected with the output end of the second driving circuit, and the voltage stabilizing value is more than or equal to 2.7V; the input end of the second optical coupling circuit is connected with the cathode of the voltage stabilizing diode; when the voltage of the output end of the second optocoupler circuit is more than or equal to 3.5V, the second substrate is switched off to output electric energy to a line controller of the air conditioner, and the output of the second driving circuit is controlled to be switched off. The invention can reliably protect the substrate and the communication loop, and improve the reliability of the power supply of the substrate to the line controller and the reliability of the communication loop.

Description

Air conditioner
Technical Field
The invention relates to the technical field of air conditioner communication, in particular to an air conditioner which can effectively protect a substrate based on interconnection of different substrates of an H-Link communication loop.
Background
At present, H-Link communication is basically adopted among an indoor unit, an outdoor unit and a line controller in a central air-conditioning system, a communication signal and a power supply signal on a communication bus are combined into a whole, and an AB two-wire connection mode is adopted between a line controller substrate and an indoor unit substrate.
A plurality of outdoor units and indoor units can be arranged in an air conditioning system, at most 64 indoor units are possible at present, the connection mode of hand shaking is adopted among different indoor units, and AB power supply voltages of the indoor units on different substrates are different (generally, the AB power supply voltages cannot exceed 2V).
Referring to fig. 1, a schematic diagram of interconnection of, for example, a # 1 indoor unit substrate and a # 2 indoor unit substrate in the prior art is shown, wherein two indoor unit substrates can realize AA/BB interconnection or AB/BA interconnection, wherein a dc impedance exists between a power supply line (communication line) of the # 1 indoor unit substrate and a power supply line (communication line) of the # 2 indoor unit substrate during interconnection. Referring to fig. 2, there is shown an internal circuit diagram of an H-Link communication circuit having a driving circuit and an optical coupler circuit, wherein an output terminal of the driving circuit is connected to an input terminal of the optical coupler circuit.
In the prior art, when the voltage difference between two substrates is less than 2V, the protection of the substrates and the communication loop is as follows.
The voltage at the point C of the optical coupling circuit 22 corresponding to the substrate is greater than or equal to 3.5V (for example, 3.5V-5V), the point D (i.e., the input point of the driving circuit 21) outputs a low level, the MCU of the substrate judges that the substrate is short-circuited, turns off the output of electric energy to the line controller, and turns off Q8 and Q11 in the driving circuit 21, thereby playing a role in protection; and the voltage at the point C is less than or equal to 0.8V (for example, at 0-0.8V), the point D outputs high level, the MCU of the substrate judges that the substrate is normal, and the MCU normally supplies power to the wire controller.
Along with the gradual popularization of intelligent voice line controller and large-screen color line controller, the difference of DC8V exists in the AB end power supply voltage of the indoor unit of different substrates, if the communication loop in fig. 2 is still adopted for communication, the protection of the corresponding substrate is disabled, the triode Q11 in the communication loop is burnt, and the reliability of power supply and communication is reduced.
Disclosure of Invention
The invention aims to provide an air conditioner, which can reliably protect a substrate and a communication loop by changing the circuit structure of the communication loop, improve the reliability of power supply of the substrate to a wire controller and the reliability of the communication loop, and facilitate the use of an intelligent voice wire controller and/or a large-screen color wire controller.
In order to solve the technical problems, the invention provides the following technical scheme for solving the problems:
the application relates to an air conditioner, its characterized in that includes first indoor set and the second indoor set of communication connection at least, first indoor set has:
a first substrate having a first voltage and a first forward diode, the first voltage outputting a first supply voltage through the first forward diode;
a first communication loop comprising:
a first driving circuit driven by the first substrate;
a first optical coupler circuit connected between the first drive circuit and a transmission/reception circuit;
the second indoor unit includes:
a second substrate having a second voltage and a second forward diode, a difference between the first voltage and the second voltage being greater than 2V, the second voltage outputting a second supply voltage through the second forward diode;
a second communication loop, comprising:
a second driving circuit driven by the second substrate;
the anode of the voltage stabilizing diode is connected with the output end of the second driving circuit, and the voltage stabilizing value is more than or equal to 2.7V;
a second optical coupling circuit connected between the cathode of the zener diode and the receiving/transmitting circuit;
when the voltage of the output end of the second optocoupler circuit is greater than or equal to 3.5V, the second substrate is switched off to output electric energy to a line controller of the air conditioner, and the output of the second driving circuit is controlled to be switched off.
In the air conditioner of the embodiment, the indoor unit substrates are in communication connection with the line controller, and the voltage stabilizing diodes connected with the optocoupler circuit and the driving circuit are added in the communication loop in one of the two interconnected indoor unit substrates with lower voltage, so that when the voltage difference of the interconnected indoor unit substrates is more than 2V, the substrates and the communication loop can be protected, the power supply reliability of the indoor unit side is improved, and the communication reliability of the communication loop is protected; the high pressure difference between the interconnected substrates is realized, the side load capacity of the line controller is improved, and the intelligent voice line controller and/or the large-screen color line controller are/is accessed and used.
In some embodiments of the present application, a first direct current resistor is provided between the signal line a of the communication line of the first substrate and the corresponding signal line of the communication line of the second substrate;
and a second direct current resistor is arranged between the signal wire B of the communication wire of the first substrate and the corresponding signal wire of the communication wire of the second substrate.
In some embodiments of the present application, the signal line a of the communication line of the first substrate and the signal line a of the communication line of the second substrate are connected, and the first direct current resistor includes a direct current resistor R1 and a direct current resistor R2 connected in series between the signal line a of the communication line of the first substrate and the signal line a of the communication line of the second substrate.
In some embodiments of the present application, the signal line B of the communication line of the first substrate and the signal line B of the communication line of the second substrate are connected, and the second dc resistance includes a dc resistance R1 'and a dc resistance R2' connected in series between the signal line B of the communication line of the first substrate and the signal line B of the communication line of the second substrate.
In some embodiments of the present application, the signal line a of the communication line of the first substrate and the signal line B of the communication line of the second substrate are connected, and the first direct current resistor includes a direct current resistor R1 and a direct current resistor R2' connected in series between the signal line a of the communication line of the first substrate and the signal line B of the communication line of the second substrate.
In some embodiments of the present application, the signal line B of the communication line of the first substrate is connected to the signal line a of the communication line of the second substrate, and the second dc resistance includes dc resistance R1' and dc resistance R2 connected in series between the signal line B of the communication line of the first substrate and the signal line a of the communication line of the second substrate.
In some embodiments of the present application, the optical coupler circuits of the first optical coupler circuit and the second optical coupler circuit have the same structure.
In some embodiments of the present application, the first optical coupler circuit includes:
one end of the first current limiting resistor is connected with the output end of the first driving circuit;
a first pin of the first optocoupler is connected with the other end of the first current-limiting resistor, a second pin and a third pin of the first optocoupler are respectively connected with a negative electrode of the first voltage, and a fourth pin of the first optocoupler is connected with a first pull-up resistor;
the second optical coupler circuit includes:
one end of the second current limiting resistor is connected with the cathode of the voltage stabilizing diode;
and a first pin of the second optocoupler is connected with the other end of the second current-limiting resistor, the second pin and the third pin are respectively connected with the negative electrode of the second voltage, and a fourth pin is connected with the second pull-up resistor.
In some embodiments of the present application, when a voltage higher than or equal to 3.5V is detected at a fourth pin of the second optical coupling circuit, the input end of the second driving circuit is controlled to be at a low level, the second substrate is turned off to output electric energy to a line controller of the air conditioner, and the output of the second driving circuit is turned off.
In some embodiments of the present application, when the voltage at the output end of the second optical coupling circuit is greater than or equal to 3.5V, the second substrate turns off the output electric energy to the line controller of the air conditioner, and controls to turn off the output of the second driving circuit, specifically:
when the voltage of the output end of the second optical coupler circuit is larger than or equal to 3.5V, N pulses are continuously received at the input end of the second driving circuit, and when the (N + 1) th pulse is received at least, the input end of the second driving circuit is controlled to be at a low level.
In some embodiments of the present application, N =3.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments of the present invention or the prior art will be briefly described below, and it is obvious that the drawings described below are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram illustrating interconnection of a # 1 indoor unit substrate and a # 2 indoor unit substrate in an air conditioner in the prior art, wherein the two indoor unit substrates are AA/BB interconnected or AB/BA interconnected.
FIG. 2 is a prior art internal circuit diagram of an H-Link communication circuit having a driver circuit and an optocoupler circuit;
FIG. 3 is a simplified circuit diagram of two indoor unit substrates AA/BB interconnected;
FIG. 4 is a simplified circuit diagram of two indoor unit substrates AB/BA when interconnected;
fig. 5 is a simplified circuit diagram of the interconnection of two indoor unit substrates AB/BA in the air conditioner according to the present invention.
Detailed Description
The technical solutions 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 a part of the embodiments of the present invention, and 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. In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
[ basic operation principle of air conditioner ]
A refrigeration cycle of an air conditioner includes a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of an air conditioner refers to a portion including a compressor of a refrigeration cycle and includes an outdoor heat exchanger, the indoor unit of an air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit of an air conditioner.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.
[ air-conditioner ]
In the present application, the air conditioner refers to a central air conditioner/multi-split air conditioner.
The central air-conditioning system comprises at least one indoor unit, at least one outdoor unit and at least one wire controller, wherein when a plurality of indoor units and one wire controller exist, the indoor units are communicated with each other and are communicated with the wire controller, and the wire controller can be powered by the indoor units.
The requirement for which indoor unit outputs power to the line controller is determined by the substrate voltage of the interconnected indoor units.
In the existing central air conditioning system, when the voltage difference between the indoor unit substrates of the interconnected indoor units does not exceed 2V, the substrates can be effectively protected, and the specific protection mechanism is described as follows.
Substrate interconnection
Referring to fig. 1, a schematic diagram of the interconnection of indoor unit substrates in a central air conditioning system is shown, and referring to fig. 2, a circuit diagram of a communication circuit in the central air conditioning system is shown.
In the central air-conditioning system, a communication signal on a communication loop and a power supply signal on a power supply loop are transmitted on the same line and are communicated by adopting an AB two-wire system, and the signals are recorded as a signal line A and a signal line B.
The description will be given taking the example of interconnection of the # 1 indoor unit and the # 2 indoor unit.
Referring to fig. 1, the voltage of the 1# indoor unit substrate of the 1# indoor unit is 15.8V, the voltage of the 2# indoor unit substrate of the 2# indoor unit is 17.2V, and the voltage difference between the two substrates is 1.4V and less than 2V.
The 1# indoor unit base plate of the 1# indoor unit and the 2# indoor unit base plate of the 2# indoor unit can be interconnected in the following manner.
The signal line A of the communication line of the 1# indoor unit is connected with the signal line A of the communication line of the 2# indoor unit, and the signal line B of the communication line of the 1# indoor unit is connected with the signal line B of the communication line of the 2# indoor unit.
The signal line a of the communication line of the 1# indoor unit is connected to the signal line B of the communication line of the 2# indoor unit, and the signal line B of the communication line of the 1# indoor unit can be connected to the signal line a of the communication line of the 2# indoor unit.
Referring to fig. 2, the indoor unit # 1 and the indoor unit # 2 both have communication loops and have the same structure for communication therebetween and with the line controller.
The communication loop comprises a driving circuit and an optical coupling circuit.
The driving circuit is driven by the indoor unit substrate and outputs a driving current (i.e. Ic) at the output end, and the position of the input end of the driving circuit is marked as a test point D.
The input end of the optical coupling circuit is connected with the output end of the driving circuit, wherein the optical coupling circuit comprises a current limiting resistor R91, an optical coupler PC and a pull-up resistor R89.
One end of a current-limiting resistor R91 is connected with the output end of the driving circuit, the other end of the current-limiting resistor R91 is connected with a first pin of the optocoupler PC, a second pin and a third pin are connected with each other and are respectively grounded, a fourth pin is connected with a pull-up resistor R89, and the pull-up resistor R89 is pulled up to a power supply of 5V.
The location where the fourth pin is connected to pull-up resistor R89 is designated test point C.
The optocoupler PC in the optocoupler circuit is two light emitting diodes which are connected end to end and connected in parallel, namely, the cathode of one light emitting diode is connected with the anode of the other light emitting diode to form a first pin of the optocoupler PC, and the anode of the one light emitting diode is connected with the cathode of the other light emitting diode to form a second pin of the optocoupler PC.
In the application, the current transmission ratio CTR of the optocoupler PC ranges from 50% to 150%.
Protection mechanism
The protection mechanism of the substrate interconnection is explained as follows.
The description will be made by taking the interconnection of the 1# indoor unit substrate of the 1# indoor unit and the 2# indoor unit substrate of the 2# indoor unit as an example.
If the voltage of a point C of the optical coupling circuit in the communication loop of the 1# indoor unit is detected to be greater than or equal to 3.5V (the voltage of the point C is 3.5V-5V), a point D (namely the input end of the driving circuit) is controlled to be at a low level by a 1# indoor unit substrate of the 1# indoor unit, and at the moment, the MCU in the 1# indoor unit judges that the 1# indoor unit substrate is in a short circuit, and the output of electric energy to the line controller is cut off.
At this time, corresponding to the communication circuit in the # 1 indoor unit, since the D point is at a low level, the transistor Q8 is turned off, the circuit of the driving current of the Q11 is interrupted, and therefore, the transistor Q11 is also turned off, and the communication circuit of the # 1 indoor unit is protected.
If the voltage of a point C of an optical coupling circuit in a communication loop of the 2# indoor unit is detected to be less than or equal to 0.8V (the voltage of the point C is 0V-0.8V), a point D (namely the input end of a driving circuit) is controlled to be at a high level by a 2# indoor unit substrate of the 2# indoor unit, and at the moment, the MCU in the 2# indoor unit judges that the 2# indoor unit substrate is normal and outputs electric energy to a line controller.
At this time, corresponding to the communication loop in the 2# indoor unit, since the D point is high, the transistor Q8 is turned on, and the loop of the driving current of Q11 is turned on, so the transistor Q11 is normally turned on.
If the voltage of a point C of the optical coupling circuit in the communication loop of the 2# indoor unit is detected to be greater than 3.5V (the voltage of the point C is 3.5V-5V), a point D (namely the input end of the driving circuit) is controlled to be low level by a 2# indoor unit substrate of the 2# indoor unit, at the moment, the MCU in the 2# indoor unit judges that the 2# indoor unit substrate is short-circuited, and the output of electric energy to the line controller is cut off.
And at this time, corresponding to the communication loop in the 2# indoor unit, since the point D is at a low level, the transistor Q8 is turned off, the loop of the driving current of the transistor Q11 is interrupted, and therefore, the transistor Q11 is also turned off, thereby playing a role in protecting the communication loop of the 2# indoor unit.
If the voltage of a point C of an optical coupling circuit in a communication loop of the indoor unit 1# is detected to be less than or equal to 3.5V (the voltage of the point C is 3.5V-5V), a point D (namely the input end of a driving circuit) is controlled to be at a high level by a base plate of the indoor unit 2#, and at the moment, the MCU in the indoor unit 2# judges that the base plate of the indoor unit 2# is normal and outputs electric energy to a line controller.
At this time, corresponding to the communication loop in the indoor unit # 1, since the D point is high, the transistor Q8 is turned on, and the loop of the driving current of Q11 is turned on, so the transistor Q11 is normally turned on.
The protection mechanism when the voltage difference between the interconnection substrates is greater than 2V will be discussed below.
Since there is an inductance in the power supply line of the 1# indoor unit substrate and an inductance in the power supply line of the 2# indoor unit substrate, each inductance has a dc impedance for dc when the 1# indoor unit substrate and the 2# indoor unit substrate are interconnected.
The dc impedance on the power supply line connected to the positive pole of the power supply voltage of the 1# indoor unit substrate may be referred to as R1, and the dc impedance on the power supply line connected to the negative pole of the power supply voltage of the 1# indoor unit substrate may be referred to as R1'.
In the present application, let R1= R1' =2 Ω.
The dc impedance on the power supply line connected to the positive pole of the supply voltage of the 2# indoor unit substrate is denoted as R2, and the dc impedance on the power supply line connected to the negative pole of the supply voltage of the 2# indoor unit substrate is denoted as R2'.
In the present application, let R2= R2' =5 Ω.
The interconnected substrates are a 1# indoor unit substrate and a 2# indoor unit substrate, wherein the power supply voltage of the 1# indoor unit substrate is 24V, and the power supply voltage of the 2# indoor unit substrate is 16V.
Therefore, when the 1# indoor unit substrate and the 2# indoor unit substrate are connected to each other by AA/BB, they can be simplified as shown in fig. 3.
Fig. 3 shows a simplified circuit diagram of the interconnection of the 1# indoor unit substrate and the 2# indoor unit substrate using AA/BB.
Referring to fig. 3, the 1# indoor unit substrate of the 1# indoor unit has a first forward diode D1, and the 1# indoor unit substrate has a first voltage e1= 24V.
The positive pole of the forward diode D1 is connected to the positive pole of the first voltage e1, and the first voltage e1 provides the first supply voltage through the diode D1 for driving the driving circuit in the indoor unit # 1 to generate the driving current Ic.
The 2# indoor unit substrate of the 2# indoor unit has the second forward diode D2, and the 2# indoor unit substrate has the second voltage e2= 16V.
The positive pole of the forward diode D2 is connected to the positive pole of the second voltage e2, and the second voltage e2 provides the second supply voltage through the diode D2 for driving the driving circuit in the 2# indoor set to generate the driving current Ic.
Referring to the interconnection of the two substrates AA/BB shown in fig. 3, since the voltage e1 of the 1# indoor unit substrate is greater than the voltage e2 of the 2# indoor unit substrate, the diode D2 isolates the e1 and the e2, and the voltage on the signal line AB is supplied from which substrate.
In this case, the 1# indoor unit substrate is protected according to the point C of the optical coupling circuit of the communication loop in the 1# indoor unit.
When the 1# indoor unit substrate and the 2# indoor unit substrate are connected by AB/BA, the connection can be simplified to FIG. 4.
Fig. 4 shows a simplified circuit diagram of the 1# indoor unit substrate and the 2# indoor unit substrate when AB/BA interconnection is adopted.
Referring to fig. 4, the 1# indoor unit substrate of the 1# indoor unit has a first forward diode D1, and the 1# indoor unit substrate has a first voltage e1= 24V.
The positive pole of the forward diode D1 is connected to the positive pole of the first voltage e1, and the first voltage e1 provides the first supply voltage through the diode D1 for driving the driving circuit in the indoor unit # 1 to generate the driving current Ic.
The 2# indoor unit substrate of the 2# indoor unit has the second forward diode D2, and the 2# indoor unit substrate has the second voltage e2= 16V.
The positive pole of the forward diode D2 is connected to the positive pole of the second voltage e2, and the second voltage e2 provides the second supply voltage through the diode D2 for driving the driving circuit in the 2# indoor set to generate the driving current Ic.
The AB/BA interconnection of the two substrates shown in fig. 4 is a superposition of the two power supplies e1 and e 2.
The protection mechanism in the AB/BA interconnection of the interconnection substrate is explained below.
First, the maximum driving current Ic outputted by the driving circuit, i.e. the maximum current that the transistor Q11 can output, is calculated.
See the current path shown in dashed lines in fig. 2.
Control current of transistor Q11: ib = (VCC-Vbesat (Q11) -Vcesat (Q8))/R75 = (24V-1.2V-0.1V)/6.9K Ω =3.3 mA.
Ic=β*Ib=120*3.3mA=0.4A。
It should be noted that (1) R83 has very small resistance, so the voltage drop is negligible here; (2) r75=6.9K Ω; (3) here, the transistor Q11 is a ROHM type 2SA2071 transistor.
For convenience of description, in fig. 4, for the communication loop of the # 1 indoor unit, an optical coupler in the optical coupler circuit is denoted as PC 1; and for the communication loop of the 2# indoor unit, the optical coupler in the spectrum circuit is marked as PC 2.
Referring to fig. 4, an analysis method of a branch node is used for analysis.
When the 1# branch is branched, the 2# branch is opened, and when the 2# branch is branched, I1= (e 1-V)D1-VPC2-Ic*（R1+R1'+R2+R2'））/R91=（24V-0.7V-1.2V-0.4A*14Ω）/10KΩ=1.65mA。
When the 2# branch is branched, the 1# branch is opened, and when the 1# branch is opened, I2= (e 2-V)D2-VPC2)/R91=（16V-0.7V-1.2V）/10KΩ=1.41mA。
The current I = I1-I2=1.65mA-1.41mA =0.24mA flowing through R91 at this time.
The current transmission ratio CTR of the optical coupler PC2 ranges from 50% to 150%.
Thus, the voltage at the fourth pin of PC2 is Vcc-R89I 1.5=5V-5.1K Ω 0.24mA 1.5=3.164V, i.e., the level at point C is 3.164V, greater than 0.8V and less than 3.5V.
And the effective protection signal (i.e. the level at the point C) detected by the MCU in the # 2 indoor unit is high level (i.e. between 3.5V and 5V), and at this time, the MCU cannot effectively protect the unit and will burn out the transistor Q11 in the communication loop.
Therefore, as can be seen from the above description and fig. 4, the voltage difference between the interconnection substrates is greater than 2V (fig. 4 shows a difference of 8V), and the MCU in the indoor unit cannot provide effective short-circuit protection.
Referring to fig. 5, there is shown a simplified circuit diagram of the substrate AB/BA interconnection in the air conditioner proposed by the present invention.
For the 2# indoor set that the indoor set base plate voltage is lower, it includes zener diode DZ.
The anode of the voltage stabilizing diode DZ is connected with the output end of the driving circuit, and the cathode of the voltage stabilizing diode DZ is connected with the input end of the optical coupling circuit of the indoor unit 2 #.
Suppose the regulated voltage value V of the voltage regulator diode DZDZ=2.7V。
For convenience of description, in fig. 5, for the communication loop of the # 1 indoor unit, an optical coupler in the optical coupler circuit is denoted as PC 1; and for the communication loop of the 2# indoor unit, the optical coupler in the spectrum circuit is marked as PC 2.
Referring to fig. 5, the analysis is still performed using the analysis method of the branch node.
When the 1# branch is branched, the 2# branch is opened, and when the 2# branch is branched, I1= (e 1-V)D1-VPC2-Ic*（R1+R1'+R2+R2'）-VDZ）/R91=（24V-0.7V-1.2V-0.4A*14Ω-2.7V）/10KΩ=1.38mA。
When the 2# branch is branched, the 1# branch is opened, and when the 1# branch is opened, I2= (e 2-V)D2-VPC2-V'DZ)/R91=（16V-0.7V-1.2V-0.7V）/10KΩ=1.34mA。
The current I = I1-I2=1.38mA-1.34mA =0.04mA flowing through R91 at this time.
The current transmission ratio CTR of the optical coupler PC2 ranges from 50% to 150%.
Therefore, the voltage at the fourth pin of the PC2 is Vcc-R89I 1.5=5V-5.1K Ω 0.04mA 1.5=4.694V, that is, the level at the point C is 4.694V, which is greater than 3.5V, and the MCU in the 2# indoor unit detects an active protection signal, and can short-circuit the substrate of the 2# indoor unit and turn off the power output to the line controller.
Suppose the regulated voltage value V of the voltage regulator diode DZDZ=3.9V。
Calculated as described above, I1= (24V-0.7V-1.2V-0.4A 14 Ω -3.9V)/10K Ω =1.26 mA.
When the 2# branch is branched, the 1# branch is opened, and in this case, I2= (16V-0.7V-1.2V-0.7V)/10K Ω =1.34 mA.
The current I = I2-I1=1.34mA-1.26mA =0.08mA flowing through R91 at this time.
The current transmission ratio CTR of the optical coupler PC2 ranges from 50% to 150%.
Therefore, the voltage at the fourth pin of the PC2 is Vcc-R89I 1.5=5V-5.1K Ω 0.08mA 1.5=4.388V, that is, the level at the point C is 4.388V, which is greater than 3.5V, and the MCU in the 2# indoor unit detects an active protection signal, and can short-circuit the substrate of the 2# indoor unit and turn off the power output to the line controller.
If the zener diode DZ is added to the communication loop of the corresponding 2# indoor unit in fig. 3, the D2 isolates e1 from e2, so that the power supply of e1 to the line controller and the communication loop is not affected.
According to the invention, the voltage stabilizing diode DZ is added in the communication loop corresponding to the substrate with lower substrate voltage in the interconnected substrate, so that when the substrate voltage difference of the interconnected substrate is more than 2V, the substrate with lower substrate voltage can be effectively subjected to short-circuit protection, reliable power supply is provided for a line controller, the use reliability of the corresponding communication loop can be ensured, and the triode Q11 in the driving loop is prevented from being burnt.
The air conditioner provided by the invention can provide substrate short-circuit protection regardless of AA/BB interconnection or AB/BA interconnection.
The large base plate voltage can realize the large current of a communication loop, the charge capacity of a wire control side is increased, and the on-load voice wire controller and/or the large-screen color wire controller are convenient, so that the use experience of a user is improved.
When the MCU detects an effective protection signal, namely the level of a point C of the optical coupling circuit in the communication loop corresponding to the substrate is more than 3.5V, the MCU can continuously output N high-level pulses to indicate that short-circuit protection action is required.
N is selected to be 3, the first high level is prevented from being an interference level, and three high level pulses are continuously received to ensure the reliability of short circuit judgment.
The longest duration of each of the three high level pulses is designed based on the power saturation resistance of transistor Q11, in this application transistor Q11 is selected to be a ROHM type 2SA2071 transistor, and thus the maximum duration of each of the three high level pulses T1/T3/T5 is 200 ms.
The minimum time of each of the durations T2/T4/T6 of the low-level pulses corresponding to the three high-level pulses is 200 ms.
After the three high levels, if a fourth high level pulse is received, the MCU performs a short-circuit protection action to force the input end (namely, the point D) of the driving circuit to be a low level, at the moment, the triode Q8 is controlled to be turned off, then the triode Q11 is turned off, the driving circuit has no output, the triode Q11 is prevented from being burnt, and the effect of protecting a communication loop is achieved.
Of course, other control conditions (such as JP jumper signals) can be added to set the D point to be low level, so as to ensure the reliability of the control driving circuit without output and the reliability of the protection communication loop.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but 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 (8)

1. An air conditioner, characterized by, include first indoor set and second indoor set that communication connects at least, first indoor set has:
a first substrate having a first voltage and a first forward diode, the first voltage outputting a first supply voltage through the first forward diode;
a first communication loop comprising:
a first driving circuit driven by the first substrate;
a first optical coupler circuit connected between the first drive circuit and a transmission/reception circuit;
the second indoor unit includes:
a second substrate having a second voltage and a second forward diode, a difference between the first voltage and the second voltage being greater than 2V, the second voltage outputting a second supply voltage through the second forward diode;
a second communication loop, comprising:
a second driving circuit driven by the second substrate;
the anode of the voltage stabilizing diode is connected with the output end of the second driving circuit, and the voltage stabilizing value is more than or equal to 2.7V;
a second optical coupling circuit connected between the cathode of the zener diode and the receiving/transmitting circuit;
when the voltage of the output end of the second optocoupler circuit is greater than or equal to 3.5V, the second substrate is switched off to output electric energy to a line controller of the air conditioner, and the output of the second driving circuit is controlled to be switched off.
2. The air conditioner according to claim 1,
a first direct current resistor is arranged between the signal line A of the communication line of the first substrate and the corresponding signal line of the communication line of the second substrate;
and a second direct current resistor is arranged between the signal wire B of the communication wire of the first substrate and the corresponding signal wire of the communication wire of the second substrate.
3. The air conditioner according to claim 2,
the signal line A of the communication line of the first substrate is connected with the signal line A of the communication line of the second substrate, and the first direct current resistor comprises a direct current resistor R1 and a direct current resistor R2 which are connected in series between the signal line A of the communication line of the first substrate and the signal line A of the communication line of the second substrate;
the signal line B of the communication line of the first substrate is connected to the signal line B of the communication line of the second substrate, and the second dc resistor includes a dc resistor R1 'and a dc resistor R2' connected in series between the signal line B of the communication line of the first substrate and the signal line B of the communication line of the second substrate.
4. The air conditioner according to claim 2,
the signal line A of the communication line of the first substrate is connected with the signal line B of the communication line of the second substrate, and the first direct current resistor comprises a direct current resistor R1 and a direct current resistor R2' which are connected in series between the signal line A of the communication line of the first substrate and the signal line B of the communication line of the second substrate;
the signal line B of the communication line of the first substrate is connected with the signal line A of the communication line of the second substrate, and the second direct current resistor comprises a direct current resistor R1' and a direct current resistor R2 which are connected in series between the signal line B of the communication line of the first substrate and the signal line A of the communication line of the second substrate.
5. The air conditioner of claim 1, wherein the first optical coupling circuit comprises:
one end of the first current limiting resistor is connected with the output end of the first driving circuit;
a first pin of the first optocoupler is connected with the other end of the first current-limiting resistor, a second pin and a third pin of the first optocoupler are respectively connected with a negative electrode of the first voltage, and a fourth pin of the first optocoupler is connected with a first pull-up resistor;
the second optical coupler circuit includes:
one end of the second current limiting resistor is connected with the cathode of the voltage stabilizing diode;
and a first pin of the second optocoupler is connected with the other end of the second current-limiting resistor, the second pin and the third pin are respectively connected with the negative electrode of the second voltage, and a fourth pin is connected with the second pull-up resistor.
6. The air conditioner according to claim 5,
when a voltage higher than or equal to 3.5V is detected at a fourth pin of the second optical coupling circuit, the input end of the second driving circuit is controlled to be at a low level, the second substrate is switched off to output electric energy to a wire controller of the air conditioner, and the output of the second driving circuit is controlled to be switched off.
7. The air conditioner according to any one of claims 1 to 6, wherein when the voltage at the output end of the second optical coupling circuit is greater than or equal to 3.5V, the corresponding substrate turns off the output of the electric energy to the line controller of the air conditioner, and controls to turn off the output of the second driving circuit, specifically:
when the voltage of the output end of the second optical coupler circuit is larger than or equal to 3.5V, N pulses are continuously received at the input end of the second driving circuit, and when the (N + 1) th pulse is received at least, the input end of the second driving circuit is controlled to be at a low level.
8. The air conditioner according to claim 7, wherein N =3.
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