CN219889732U - Communication fault detection circuit and air conditioner - Google Patents

Abstract

The utility model discloses a communication fault detection circuit and an air conditioner, wherein the communication fault detection circuit comprises an indoor unit communication circuit, an outdoor unit communication circuit, a sampling circuit, an amplifying circuit, a first comparison circuit and a second comparison circuit, wherein the indoor unit communication circuit is electrically connected with a zero line and a fire wire, the communication circuit is used for connecting the indoor unit communication circuit with the outdoor unit communication circuit, the sampling circuit is electrically connected with the zero line and the communication circuit, the amplifying circuit is electrically connected with the sampling circuit, the first comparison circuit and the second comparison circuit are electrically connected with the amplifying circuit, and the data sent by the indoor unit and the outdoor unit are judged through amplification and comparison by collecting indoor and outdoor data sending waveforms between the zero line and the communication circuit, so that the fault occurrence position is eliminated, and the reason for causing the communication fault is accurately judged.

Description

Communication fault detection circuit and air conditioner

Technical Field

The present utility model relates to the field of air conditioners, and in particular, to a communication fault detection circuit and an air conditioner.

Background

In the current air conditioner indoor unit and outdoor unit generally adopt current loop communication, in the fault judging process, when the indoor unit cannot receive the data of the outdoor unit, the outdoor unit communication fault is included, when the outdoor unit cannot receive the data of the indoor unit, the indoor unit fault is reported, but because the indoor unit cannot receive the data of the outdoor unit except the outdoor unit communication fault, the receiving end of the indoor unit is possibly faulty, and similarly, the outdoor unit cannot receive the data of the indoor unit except the indoor unit communication fault, the receiving end of the outdoor unit is also possibly faulty, so the fault position judgment in the current fault detecting method is inaccurate.

In the related art, by detecting data sent by the indoor unit and the outdoor unit, it is determined that a fault occurs in the indoor unit or the outdoor unit, so that maintenance efficiency is improved, and a fault position cannot be intuitively displayed.

In view of this, the present utility model has been proposed.

Disclosure of Invention

The utility model provides a communication fault detection circuit, which is used for judging the data transmitted by an indoor unit and an outdoor unit by sampling the indoor and outdoor data transmission waveforms between a zero line and a communication line, so as to eliminate whether the transmitting end of the indoor unit and the outdoor unit has faults or not and accurately judge the reason of the communication faults.

In a first aspect, the present utility model provides a communication failure detection circuit including:

the indoor unit communication circuit is electrically connected with the zero line and the fire wire;

an outdoor unit communication circuit electrically connected to the zero line;

one end of the communication line is electrically connected with the indoor unit communication circuit, and the other end of the communication line is electrically connected with the outdoor unit communication circuit;

the input end of the sampling circuit is connected with the zero line and the communication line;

the input end of the amplifying circuit is connected with the output end of the sampling circuit;

the input end of the first comparison circuit is electrically connected with the output end of the amplifying circuit, and the first comparison circuit receives the amplified signal output by the amplifying circuit and compares the amplified signal with a first reference voltage so as to output an electric signal of corresponding outdoor data;

the input end of the second comparison circuit is electrically connected with the output end of the amplifying circuit, and the second comparison circuit receives the amplified signal output by the amplifying circuit and compares the amplified signal with a second reference voltage so as to output an electric signal corresponding to indoor data.

In some embodiments, the first comparison circuit comprises:

the first end of the first resistor is electrically connected with the pull-up voltage;

the first end of the second resistor is electrically connected with the second end of the first resistor, the second end of the second resistor is grounded, and the first resistor and the second resistor are used for outputting a first reference voltage;

the first comparator is used for receiving the amplified signal and the first reference voltage output by the amplifying circuit, outputting a high level when the amplified signal is smaller than the first reference voltage, and outputting a low level when the amplified signal is larger than the first reference voltage.

In some embodiments, the second comparison circuit comprises:

the first end of the third resistor is electrically connected with the pull-up voltage;

the first end of the fourth resistor is electrically connected with the second end of the third resistor, the second end of the fourth resistor is grounded, and the third resistor and the fourth resistor are used for outputting a second reference voltage;

the first input end of the second comparator is electrically connected with the output end of the amplifying circuit, the second input end of the second comparator is electrically connected with the second end of the third resistor, the second comparator receives the amplified signal and the second reference voltage output by the amplifying circuit, outputs a high level when the amplified signal is smaller than the second reference voltage, and outputs a low level when the amplified signal is larger than the second reference voltage.

In some embodiments, the voltage regulator further comprises a voltage reducing circuit, an input end of the voltage reducing circuit is electrically connected with an output end of the sampling circuit, an output end of the voltage reducing circuit is electrically connected with an input end of the amplifying circuit, and the voltage reducing circuit is used for reducing the collected voltage value and outputting the voltage value to the amplifying circuit.

In some embodiments, the step-down circuit includes:

the first end of the fifth resistor is electrically connected with the zero line, and the second end of the fifth resistor is electrically connected with the input end of the amplifying circuit;

and the first end of the sixth resistor is electrically connected with the communication circuit, and the second end of the sixth resistor is electrically connected with the input end of the amplifying circuit.

In some embodiments, the amplifying circuit includes:

the first input end of the amplifier is electrically connected with the fifth resistor, the second input end of the amplifier is electrically connected with the sixth resistor, and the amplifier is used for amplifying the data after voltage reduction and outputting amplified signals to the first comparison circuit and the second comparison circuit;

the first end of the seventh resistor is electrically connected with the first input end of the amplifier, and the second end of the seventh resistor is grounded;

the first end of the eighth resistor is electrically connected with the output end of the amplifier, and the second end of the eighth resistor is electrically connected with the first input end of the amplifier.

In some embodiments, the indoor unit communication circuit includes:

the first optical coupler is electrically connected with the live wire and the zero wire and is used as a communication signal transmitting end of the indoor unit;

the second optical coupler is electrically connected with one end of the communication line and the first optical coupler, and is used as a communication signal receiving end of the indoor unit.

In some embodiments, the system further comprises a controller electrically connected to the output of the first comparator and the output of the second comparator, the controller being configured to receive the high and low levels and output a fault location.

In some embodiments, the communication fault detection circuit further comprises:

the input end of the first protection circuit is electrically connected with the output end of the first comparator, and the output end of the first protection circuit is electrically connected with the controller;

and the input end of the second protection circuit is electrically connected with the output end of the second comparator, and the output end of the second protection circuit is electrically connected with the controller.

In a second aspect, the present utility model also provides an air conditioner, including the communication failure detection circuit of the first aspect.

By arranging the communication fault detection circuit in the air conditioner, when the communication fault occurs, the occurrence position of the communication fault can be accurately judged.

Drawings

FIG. 1 illustrates a circuit schematic of a communication circuit according to some embodiments;

FIG. 2 illustrates a circuit schematic of a communication circuit according to some embodiments;

FIG. 3 illustrates a schematic diagram of a pulsed signal between a neutral line and a communication line, according to some embodiments;

FIG. 4 illustrates a block diagram of a communication fault detection circuit according to some embodiments;

FIG. 5 illustrates yet another block diagram of a communication fault detection circuit according to some embodiments;

FIG. 6 illustrates yet another block diagram of a communication fault detection circuit according to some embodiments;

FIG. 7 illustrates a circuit schematic of a communication fault detection circuit in accordance with some embodiments;

fig. 8 illustrates a schematic structural view of an air conditioner according to some embodiments;

FIG. 9 illustrates a hardware block diagram of an air conditioner having a communication fault detection circuit according to some embodiments;

FIG. 10 illustrates a flow chart of fault detection for an air conditioner according to some embodiments;

in the above figures:

a communication failure detection circuit 1; an indoor unit communication circuit 10; an outdoor unit communication circuit 20; a communication line S1;

a sampling circuit 30; an amplifying circuit 40; a first comparison circuit 50; a second comparison circuit 60;

a step-down circuit 70; a controller 80; an indoor unit 100; an outdoor unit 200; a control device 300;

a first protection circuit 90; a second protection circuit 12.

Detailed Description

For the purposes of making the objects and embodiments of the present utility model more apparent, an exemplary embodiment of the present utility model will be described in detail below with reference to the accompanying drawings in which exemplary embodiments of the present utility model are illustrated, it being apparent that the exemplary embodiments described are only some, but not all, of the embodiments of the present utility model.

It should be noted that the brief description of the terminology in the present utility model is for the purpose of facilitating understanding of the embodiments described below only and is not intended to limit the embodiments of the present utility model. Unless otherwise indicated, these terms should be construed in their ordinary and customary meaning.

The terms "first," second, "" third and the like in the description and in the claims and in the above drawings are used for distinguishing between similar or similar objects or entities and not necessarily for describing a particular sequential or chronological order, unless otherwise indicated. It is to be understood that the terms so used are interchangeable under appropriate circumstances.

The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or apparatus that comprises a list of elements is not necessarily limited to all elements explicitly listed, but may include other elements not expressly listed or inherent to such product or apparatus.

The present embodiment provides a communication failure detection circuit 1 that can be used for determining a failure position when a communication failure occurs between an indoor unit 100 and an outdoor unit 200 of a split type air conditioner. It can be understood that the communication fault detection circuit 1 provided in this embodiment may also be applied to other two terminals that need to communicate, so as to determine the fault location determination when the two communication parties have a communication fault.

Referring to fig. 1-2, which are schematic circuit diagrams of a specific application of the communication fault detection circuit 1 in this embodiment, the communication fault detection circuit 1 includes an indoor unit communication circuit 10, an outdoor unit communication circuit 20, and a communication line Sl. The indoor unit communication circuit 10 is electrically connected with the zero line N and the live line L so as to supply power by using commercial power; the outdoor unit communication circuit 20 is electrically connected with the zero line N; one end of the communication line Sl is electrically connected to the indoor unit communication circuit 10, and the other end of the communication line Sl is electrically connected to the outdoor unit communication circuit 20, so as to realize data transmission between the indoor unit 100 and the outdoor unit 200, so as to satisfy data bases and control instructions required by normal operation of the indoor unit 100 and the outdoor unit 200.

Referring to fig. 2, the circuit principles of the indoor unit communication circuit 10 and the outdoor unit communication circuit 20 are substantially the same, and the indoor unit communication circuit 10 is taken as an example in this embodiment.

The indoor unit communication circuit 10 includes a first optocoupler B1 and a second optocoupler B2, where the first optocoupler B1 is electrically connected to the live wire L and the neutral wire N, the first optocoupler B1 is used as a communication signal transmitting end of the indoor unit 100, the second optocoupler B2 is electrically connected to one end of the communication line and the first optocoupler B1, and the second optocoupler B2 is used as a communication signal receiving end of the indoor unit 100.

Specifically, the live line LL of the power supply is input to the indoor access terminal X1, the neutral line N of the power supply is input to the indoor access terminal X2, the voltage is reduced and the current is limited through the ninth resistor R9, the diode V1 and the tenth resistor R10 form a half-wave rectifying circuit, the input alternating current is rectified into direct current, the capacitor C1 plays a role in smooth filtering and energy storage, the voltage stabilizing diode V2 realizes stable clamping of the voltage, and the voltage stabilizing diode V2 is an exemplary 24V voltage stabilizing diode.

An eleventh resistor R11 is connected between the pin E of the first optocoupler B1 and the pin K of the second optocoupler B2, and the optocoupler is reversely protected through the eleventh resistor R11, because the optocoupler can be reversely conducted when the reverse voltage of the optocoupler reaches a certain value, if the reverse voltage continues to raise the device, the device can be damaged, and meanwhile, the eleventh resistor R11 can also play a role in shunting to a certain extent.

The first optical coupler B1 and the second optical coupler B2 play roles in signal transmission and electrical isolation, wherein the first optical coupler B1 is an indoor communication signal transmitting end, the second optical coupler B2 is an indoor communication signal receiving end, the outdoor unit communication circuit 20 comprises a third optical coupler B3 and a fourth optical coupler B4, the third optical coupler B3 is an outdoor communication signal receiving end, and the fourth optical coupler B4 is an outdoor communication signal transmitting end.

In general, in order to ensure reliable transmission of communication signals, a transmitting end needs to be maintained in a normal-on state after the transmitting end transmits signals, so as to ensure that the whole communication loop is conducted, and thus, a receiving end can reliably receive signals. For example, when the first optical coupler B1 at the indoor communication signal transmitting end transmits a signal, the fourth optical coupler B4 at the indoor communication signal transmitting end is in a normally-on state; and when the fourth optical coupler B4 at the outdoor communication signal transmitting end transmits signals, the first optical coupler B1 at the indoor communication signal transmitting end is in a normally-on state.

The diode V3 plays a role in unidirectional isolation protection, and prevents the communication line from being damaged by abnormal high voltage caused by incorrect wiring in the installation process of the split air conditioner, and by way of example, the live wire LL of the power supply is connected to the communication line on the indoor side by mistake, and current cannot reversely flow through the diode V3 due to the fact that the diode V3 is arranged, so that the second optocoupler B2 is protected from being damaged.

Meanwhile, the diode V6 at the outdoor unit 200 side also plays a role in unidirectional isolation protection, and prevents the communication circuit 4 from being damaged by abnormal high voltage caused by incorrect wiring in the installation process of the split air conditioner.

As can be seen from the above, the communication circuit of the indoor unit 100, the communication circuit of the outdoor unit 200, and the communication circuit play a very important role in the operation of the split air conditioner, and the indoor/outdoor unit can ensure that the split air conditioner operates normally in a set mode corresponding to the operation command only by exchanging information during the operation through the above components.

In this embodiment, whether indoor data or outdoor data is received is determined according to a communication waveform collected between the zero line N and the communication line Sl, and whether the collected communication waveform is a signal (outdoor data) sent by the outdoor unit 200 to the indoor unit 100 or a signal (indoor data) sent by the indoor unit 100 to the outdoor unit 200 can be determined according to a pulse amplitude and a pulse width of the waveform, specifically, referring to fig. 3, whether the collected pulse signal is indoor data or outdoor data is sent according to different pulse amplitude values in the fig. to realize sampling monitoring on the indoor data and the outdoor data.

Referring to fig. 4, the communication fault detection circuit 1 further includes a sampling circuit 30, an amplifying circuit 40, a first comparing circuit 50 and a second comparing circuit 60, wherein an input end of the sampling circuit 30 is connected to the zero line N and the communication circuit, an input end of the amplifying circuit 40 is electrically connected to an output end of the sampling circuit 30, an input end of the first comparing circuit 50 is electrically connected to an output end of the amplifying circuit 40, and an input end of the second comparing circuit 60 is electrically connected to an output end of the amplifying circuit 40, so as to sample, amplify and compare pulse signals between the zero line N and the communication circuit Sl, and realize judgment of a fault position.

Wherein, the first comparing circuit 50 is used for judging whether the outdoor data is normally transmitted. In the communication fault detection circuit 1, the sampling circuit 30 is configured to collect a pulse signal between the zero line N and the communication line Sl; the amplifying circuit 40 is used for amplifying the collected pulse signals; the first comparing circuit 50 is configured to receive the amplified signal output from the amplifying circuit 40 and compare the amplified signal with a first reference voltage to output a corresponding electrical signal of outdoor data, which may be used to determine whether a problem occurs at a receiving end or a transmitting end of the outdoor data.

It will be understood that, when the communication failure detection circuit 1 detects the corresponding outdoor data, but the indoor unit 100 does not receive the data from the outdoor unit 200, it may be determined that the communication signal transmitting end of the outdoor unit 200 is normal, and the receiving circuit of the communication signal of the indoor unit 100 is failed.

When the communication signal transmitted from the outdoor unit 200 is known, but the first comparison circuit 50 does not receive the corresponding outdoor data, it may be determined that the outdoor unit 200 fails to transmit the signal, and the transmission circuit of the communication signal from the outdoor unit 200 is faulty.

It should be noted that, the setting of the first reference voltage may be set according to the amplitude of the pulse signal carrying the outdoor data, so as to determine the pulse signal.

Similarly, the second comparing circuit 60 is used to determine whether the indoor data is normally transmitted. The second comparing circuit 60 receives the amplified signal outputted from the amplifying circuit 40 and compares it with the set second reference voltage to output an electric signal of the corresponding indoor data, which can be used as a means for judging whether a problem occurs at the receiving end or the transmitting end of the indoor data.

It will be understood that when the communication failure detection circuit 1 detects corresponding indoor data, but the outdoor unit 200 does not receive data from the indoor unit 100, it may be determined that the communication signal transmitting end of the indoor unit 100 is normal, and the receiving circuit of the communication signal of the outdoor unit 200 is abnormal, that is, fails.

When the indoor unit 100 is known to transmit a communication signal, but the second comparator circuit 60 does not receive corresponding indoor data, it can be determined that the indoor unit 100 fails to transmit data, and the transmission circuit of the communication signal of the indoor unit 100 fails.

It should be noted that, the setting of the second reference voltage may be set according to the amplitude of the pulse signal of the carried indoor data, so as to determine the pulse signal.

In some implementations of the present embodiment, referring to fig. 5, the communication fault detection circuit 1 further includes a controller 80, where the controller 80 is electrically connected to the output end of the first comparison circuit 50 and the output end of the second comparison circuit 60, and the controller 80 outputs the fault location according to the received high and low levels.

It is understood that the controller 80 may include an indoor controller disposed in the indoor unit 100 and an outdoor controller disposed in the outdoor unit 200, and the indoor controller or the outdoor controller may be used to perform signal reception of the first comparison circuit 50 and the second comparison circuit 60 and determine a fault location according to the received signals.

In some implementations of the present embodiment, the controller 80 may be mounted on top of the air conditioner, and it is understood that the controller 80 may be placed at other locations of the air conditioner according to functional requirements or layout requirements.

The controller 80 may control various operations of the air conditioner through various software control programs on the memory and respond to the operation of the user, the controller 80 adjusts the overall operation of the air conditioner, and in this embodiment, the controller 80 receives the high-low level signal and acquires the position of the communication abnormality accordingly.

In some embodiments, an early warning component may be further disposed, where the early warning component is electrically connected to the controller 80, and after receiving the high-low level signal, the controller 80 sends the position of the communication abnormality to the early warning component in an electrical signal manner, and the early warning component informs the user in such manners as whistling, flashing lights, etc. that are not provided, so as to intuitively remind the user of the position of the fault in the communication process.

In some implementations of the present embodiment, referring to fig. 6, the communication fault detection circuit 1 further includes a voltage step-down circuit 70, an input end of the voltage step-down circuit 70 is electrically connected to an output end of the sampling circuit 30, an output end of the voltage step-down circuit 70 is electrically connected to an input end of the amplifying circuit 40, and the voltage step-down circuit 70 is configured to reduce the collected voltage value and output the voltage value to the amplifying circuit 40.

In some implementations of the present embodiment, referring to fig. 7, the voltage step-down circuit 70 includes a fifth resistor R5 and a sixth resistor R6, where a first end of the fifth resistor R5 is electrically connected to the zero line N, and a second end of the fifth resistor R5 is electrically connected to the input end of the amplifying circuit 40; the first end of the sixth resistor R6 is electrically connected to the communication line Sl, and the second end of the sixth resistor R6 is electrically connected to the input end of the amplifying circuit 40. The voltage-reducing circuit 70 is configured by the fifth resistor R5 and the sixth resistor R6 to reduce the voltage value of the detected pulse to a voltage that can be received by the amplifying circuit 40, and it is known that different values of the fifth resistor R5 and the sixth resistor R6 can be selected for different voltage values of the zero line N and the communication line Sl. In some implementations of the present embodiment, the amplifying circuit 40 is configured to amplify the pulse signal after the step-down. Referring to fig. 7, the amplifying circuit 40 further includes an amplifier, a seventh resistor R7 and an eighth resistor R8, wherein a first input end of the amplifier is electrically connected to the fifth resistor R5, a second input end of the amplifier is electrically connected to the sixth resistor R6, and the amplifier is used for amplifying the data after voltage reduction and outputting amplified signals to the first comparing circuit 50 and the second comparing circuit 60; the first end of the seventh resistor R7 is electrically connected with the first input end of the amplifier, and the second end of the seventh resistor R7 is grounded; the first end of the eighth resistor R8 is electrically connected with the output end of the amplifier, and the second end of the eighth resistor R8 is electrically connected with the first input end of the amplifier. It is known that the amplification circuit 40 can amplify different multiples by the resistance matching setting of the seventh resistor R7 and the eighth resistor R8. In some implementations of this embodiment, referring to fig. 7, the first comparing circuit 50 includes a first resistor R1, a second resistor R2, and a first comparator, where the first resistor R1 and the second resistor R2 are used for outputting a first reference voltage, and different first reference voltages can be obtained according to values of the first resistor R1, the second resistor R2, and a pull-up voltage, and a connection manner of the first resistor R1 and the second resistor R2 is: the first end of the first resistor R1 is electrically connected to the pull-up voltage, the second end of the first resistor R1 is electrically connected to the first end of the second resistor R2, and the second end of the second resistor R2 is grounded. By way of example, the pull-up voltage may be set to 5V. The first input end of the first comparator is electrically connected with the output end of the amplifying circuit 40, the second input end of the first comparator is electrically connected with the second end of the first resistor R1, so that the first comparator is connected with the first reference voltage through the second input end, the output end of the first comparator is connected with the controller 80, the first comparator receives an amplified signal of the amplifying circuit 40 and compares the amplified signal with the input first reference voltage, outdoor data are extracted, a high level is output to the controller 80 when the amplified signal is smaller than the first reference voltage, a low level is output to the controller 80 when the amplified signal is larger than the first reference voltage, and the controller 80 can judge the communication fault position according to the high level and the low level. In some implementations of the present embodiment, referring to fig. 7, the second comparing circuit 60 includes a third resistor R3, a fourth resistor R4, and a second comparator, wherein the third resistor R3 and the fourth resistor R4 are configured to output a second reference voltage, and different second reference voltages may be obtained according to values of the third resistor R3, the fourth resistor R4, and the pull-up voltage. The third resistor R3 and the fourth resistor R4 are connected in the following manner: the first end of the third resistor R3 is electrically connected to the pull-up voltage, the second end of the third resistor R3 is electrically connected to the first end of the fourth resistor R4, and the second end of the second resistor R2 is grounded. The first input end of the second comparator is electrically connected with the output end of the amplifying circuit 40, the second input end of the second comparator is electrically connected with the second end of the third resistor R3, so that the second comparator is connected with a second reference voltage through the second input end, the output end of the second comparator is connected with the controller 80, the second comparator receives an amplified signal of the amplifying circuit 40 and compares the amplified signal with the input second reference voltage, indoor data are extracted, a high level is output to the controller 80 when the amplified signal is smaller than the second reference voltage, a low level is output to the controller 80 when the amplified signal is larger than the second reference voltage, and the controller 80 can judge the communication fault position according to the high level and the low level.

Through the above, the indoor data and the outdoor data are sampled and extracted, and the obtained indoor data and outdoor data are respectively input to different pins of the controller 80, and the data are judged and processed through the controller 80.

In some implementations of the present embodiment, the communication fault detection circuit 1 further includes a first protection circuit 90 and a second protection circuit 12, wherein an input end of the first protection circuit 90 is electrically connected to an output end of the first comparator, an output end of the first protection circuit 90 is electrically connected to the controller 80, an input end of the second protection circuit 12 is electrically connected to an output end of the second comparator, and an output end of the second protection circuit 12 is electrically connected to the controller 80. The current amount of the flow path can be increased by providing the protection circuit, the arrangement principle of the first protection circuit 90 and the second protection circuit 12 is the same, taking the first protection circuit 90 as an example, the first protection circuit 90 includes a twelfth resistor R12 and a thirteenth resistor R13, wherein a first end of the twelfth resistor R12 is connected to the pull-up voltage, a second end of the twelfth resistor R12 is connected to the output end of the first comparator, a first end of the thirteenth resistor R13 is connected to the output end of the first comparator, and a second end of the thirteenth resistor R13 is connected to the controller 80.

In addition to the above-described communication failure detection circuit 1, the present utility model also proposes an air conditioner, which is specifically configured as a split type air conditioner including a control device 300, an indoor unit 100, and an outdoor unit 200, referring to fig. 8. The control device 300 is used for a user to issue an operation instruction to control the operation of the indoor unit 100 and the outdoor unit 200. It is rational that the control device 300 is provided as a remote control.

The split type air conditioner is an air conditioner in which the indoor unit 100 is installed in the indoor space, the outdoor unit 200 is installed in the outdoor space, and the indoor unit 100 and the outdoor unit 200 of the split type air conditioner can be arranged one by one through pipelines and wire connection cards, and of course, one by one can be arranged as required.

Referring to fig. 9, the air conditioner includes an indoor unit 100, an outdoor unit 200, and the communication failure detection circuit 1, and when communication between the indoor unit 100 and the outdoor unit 200 fails, the communication failure detection circuit 1 can determine the failure occurrence position. It is to be understood that, when there are a plurality of indoor units 100, a corresponding number of communication fault detection circuits 1 may be provided according to the number of specific communication lines Sl to detect the data transmission condition of each communication line Sl.

If one or a combination of the communication circuit of the indoor unit 100 and the communication circuit of the outdoor unit 200 fails, the indoor unit 200 or the outdoor unit 200 cannot normally receive and transmit the communication command, and the air conditioner enters a protection state and cannot normally operate. For example, the outdoor unit 200 cannot know whether the current operation command is cooling or heating, and thus cannot correctly control the switching of the four-way valve. However, the components having the communication function are composed of a plurality of electronic parts, and if one of the components fails, the split air conditioner may not work normally, and thus the split air conditioner may not work due to the failure of the communication circuit of the indoor unit 100, the communication circuit of the outdoor unit 200, and the communication line.

The air conditioner completes normal data communication through the indoor unit 100 and the outdoor unit 200 to maintain the cooling and heating cycle of the air conditioner itself, so as to control the compressor and the expansion valve of the air conditioner to operate according to a preset program. The air conditioner performs a cooling and heating cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigerating cycle and the heating cycle comprise a compression process, a condensation process, an expansion process and an evaporation process, and cold or heat is provided for the indoor space through the heat absorption and release processes of the refrigerant, so that the temperature of the indoor space is regulated.

Specifically, the compressor compresses 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 high-temperature high-pressure gaseous refrigerant into liquid refrigerant, and heat is released to the surrounding environment through the condensation process.

The liquid refrigerant flowing out of the condenser enters an expansion valve, and the expansion valve expands the liquid refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid refrigerant. The low-pressure liquid refrigerant flowing out of the expansion valve enters the evaporator, absorbs heat when the liquid refrigerant flows through the evaporator, evaporates into low-temperature low-pressure refrigerant gas, and returns the refrigerant gas in a low-temperature low-pressure state to the compressor. The evaporator may achieve a cooling effect by exchanging heat with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner may adjust the temperature of the indoor space throughout the cycle.

It can be understood that the indoor unit 100 or the outdoor unit 200 can also control the working states of the fan, the air deflector motor, etc. according to the communication data, so as to realize the component actions in the modes of refrigeration, heating, self-cleaning, formaldehyde removal, etc.

By adopting the communication fault detection circuit 1, the air conditioner can rapidly and accurately judge the sounding position of the communication fault when the communication fault occurs, and further maintain the normal operation of the air conditioner.

Referring to fig. 10, a failure detection step of the air conditioner will be described.

Firstly, the outdoor unit 200 is made to transmit test data (step S1), and it is determined whether the communication failure detection circuit 1 detects outdoor data between the neutral line N and the communication line Sl (step S2);

in step S2, the communication failure detection circuit 1 detects outdoor data, determines that there is no failure at the transmitting end of the outdoor unit 200, and then performs step S3 to determine whether the indoor unit 100 receives the test data;

in step S3, if the indoor unit 100 receives the test data, it is determined that there is no fault at the receiving end of the indoor unit 100, then step S5 is performed to enable the indoor unit 100 to send the test data, and then step S7 is performed to determine whether the communication fault detection circuit 1 detects the indoor data between the zero line N and the communication line Sl;

in step S7, the communication failure detection circuit 1 detects indoor data, and step S8 is executed to determine that there is no failure at the transmitting end of the indoor unit 100 at this time, and to determine whether the outdoor unit 200 receives the test data;

in step S8, if the outdoor unit 200 receives the test data, it is determined that the receiving end of the outdoor unit 200 is not faulty at this time, step S1 is performed;

in step S8, if the outdoor unit 200 does not receive the test data, step S10 is performed to determine that the receiving end of the outdoor unit 200 is faulty at this time;

in step S7, the communication failure detection circuit 1 does not detect indoor data, and step S9 is executed to determine that the transmitting end of the indoor unit 100 is failed at this time;

in step S3, if the indoor unit 100 does not receive the test data, step S6 is executed to determine that the receiving end of the indoor unit 100 cannot receive the information at this time, and the receiving end of the communication signal of the indoor unit 100 fails;

in step S2, the communication failure detection circuit 1 does not detect outdoor data, and step S4 is executed to determine that the transmitting end of the outdoor unit 200 cannot normally transmit at this time, and the transmitting end of the communication information of the outdoor unit 200 fails;

it should be noted that, when a communication failure is detected and normal communication is disabled, the above-mentioned cycle is continued.

In the above embodiment, the communication fault detection circuit 1 is provided first, the sampling circuit 30 detects the pulse signal between the zero line N and the communication line Sl, and performs the step-down processing on the collected signal, so that the data after the step-down is used by using the subsequent device enters the amplifying circuit 40 to perform the amplifying processing, then the amplified signal is input into the first comparing circuit 50 and the second comparing circuit 60 respectively, and the first reference voltage is set to determine whether the outdoor data is detected, so as to determine whether the transmitting end or the receiving end related to the outdoor data has a fault, and the second reference voltage is set to determine whether the indoor data is detected, so as to determine whether the transmitting end or the receiving end related to the indoor data has a fault, thereby achieving the purpose of accurately determining the fault position, assisting the maintenance personnel to confirm the fault position as soon as possible, and improving the maintenance efficiency.

Meanwhile, an air conditioner using the communication fault detection circuit 1 is also provided, and the air conditioner judges the fault position when the indoor unit 100 and the outdoor unit 200 are in fault through the communication fault detection circuit 1, so that the maintenance efficiency of the air conditioner is improved, and the normal operation of the air conditioner is ensured.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model 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 scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

The foregoing description, for purposes of explanation, has been presented in conjunction with specific embodiments. However, the illustrative discussions above are not intended to be exhaustive or to limit the embodiments to the precise forms disclosed above. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles and the practical application, to thereby enable others skilled in the art to best utilize the embodiments and various embodiments with various modifications as are suited to the particular use contemplated.

Claims (10)

1. A communication failure detection circuit, comprising:

the indoor unit communication circuit is electrically connected with the zero line and the fire wire;

an outdoor unit communication circuit electrically connected to the zero line;

one end of the communication circuit is electrically connected with the indoor unit communication circuit, and the other end of the communication circuit is electrically connected with the outdoor unit communication circuit;

the input end of the sampling circuit is connected with the zero line and the communication line;

the input end of the amplifying circuit is connected with the output end of the sampling circuit;

the input end of the first comparison circuit is electrically connected with the output end of the amplifying circuit, and the first comparison circuit compares the received amplified signal output by the amplifying circuit with a first reference voltage and outputs an electric signal of corresponding outdoor data;

the input end of the second comparison circuit is electrically connected with the output end of the amplifying circuit, and the second comparison circuit compares the received amplified signal output by the amplifying circuit with a second reference voltage and outputs an electric signal corresponding to indoor data.

2. The communication failure detection circuit of claim 1, wherein the first comparison circuit comprises:

the first end of the first resistor is electrically connected with the pull-up voltage;

the first end of the second resistor is electrically connected with the second end of the first resistor, the second end of the second resistor is grounded, and the first resistor and the second resistor are used for outputting a first reference voltage;

the first input end of the first comparator is electrically connected with the output end of the amplifying circuit, the second input end of the first comparator is electrically connected with the second end of the first resistor, the first comparator receives the amplifying signal output by the amplifying circuit and the first reference voltage, outputs a high level when the amplifying signal is smaller than the first reference voltage, and outputs a low level when the amplifying signal is larger than the first reference voltage.

3. The communication failure detection circuit according to claim 2, wherein the second comparison circuit includes:

the first end of the third resistor is electrically connected with the pull-up voltage;

the first end of the fourth resistor is electrically connected with the second end of the third resistor, the second end of the fourth resistor is grounded, and the third resistor and the fourth resistor are used for outputting a second reference voltage;

the first input end of the second comparator is electrically connected with the output end of the amplifying circuit, the second input end of the second comparator is electrically connected with the second end of the third resistor, the second comparator receives the amplifying signal output by the amplifying circuit and the second reference voltage, outputs a high level when the amplifying signal is smaller than the second reference voltage, and outputs a low level when the amplifying signal is larger than the second reference voltage.

4. The communication fault detection circuit according to any one of claims 1 to 3, further comprising a step-down circuit, wherein an input end of the step-down circuit is electrically connected to an output end of the sampling circuit, an output end of the step-down circuit is electrically connected to an input end of the amplifying circuit, and the step-down circuit is configured to reduce the collected voltage value and output the reduced voltage value to the amplifying circuit.

5. The communication failure detection circuit according to claim 4, wherein the step-down circuit includes:

the first end of the fifth resistor is electrically connected with the zero line, and the second end of the fifth resistor is electrically connected with the input end of the amplifying circuit;

and the first end of the sixth resistor is electrically connected with the communication circuit, and the second end of the sixth resistor is electrically connected with the input end of the amplifying circuit.

6. The communication failure detection circuit according to claim 5, wherein the amplification circuit includes:

the first input end of the amplifier is electrically connected with the fifth resistor, the second input end of the amplifier is electrically connected with the sixth resistor, and the amplifier is used for amplifying the data after voltage reduction and outputting amplified signals to the first comparison circuit and the second comparison circuit;

a seventh resistor, wherein a first end of the seventh resistor is electrically connected with the first input end of the amplifier, and a second end of the seventh resistor is grounded;

and the first end of the eighth resistor is electrically connected with the output end of the amplifier, and the second end of the eighth resistor is electrically connected with the first input end of the amplifier.

7. The communication failure detection circuit of claim 1, wherein the indoor unit communication circuit comprises:

the first optical coupler is electrically connected with the live wire and the null wire and is used as an indoor unit communication signal transmitting end;

the second optical coupler is electrically connected with one end of the communication line and the first optical coupler, and is used as a communication signal receiving end of the indoor unit.

8. The communication fault detection circuit of claim 3, further comprising a controller electrically coupled to the output of the first comparator and the output of the second comparator, the controller configured to receive the high and low levels and output a fault location.

9. The communication fault detection circuit of claim 8, further comprising:

the input end of the first protection circuit is electrically connected with the output end of the first comparator, and the output end of the first protection circuit is electrically connected with the controller;

and the input end of the second protection circuit is electrically connected with the output end of the second comparator, and the output end of the second protection circuit is electrically connected with the controller.

10. An air conditioner comprising the communication failure detection circuit according to any one of claims 1 to 9.