Communication detection circuit and test tool

Abstract

The utility model discloses a communication detection circuit and a test tool, and the communication detection circuit comprises an indoor unit simulation circuit, an outdoor unit simulation circuit, and a monitoring circuit. The communication line interface is used for accessing a communication line of a tested device and is electrically connected with the indoor unit analog circuit, the outdoor unit analog circuit and the monitoring circuit respectively; the control chip is electrically connected with the indoor unit analog circuit, the outdoor unit analog circuit and the monitoring circuit, and the control chip is further used for establishing communication connection with the outdoor unit through the indoor unit analog circuit when the detected device comprises the outdoor unit so as to carry out fault detection on the outdoor unit; and when the detected device comprises the indoor unit, establishing communication connection with the indoor unit through the outdoor unit analog circuit so as to perform fault detection on the indoor unit, the control chip is also used for monitoring the communication signal transmitted by the communication line through the monitoring circuit; according to the technical scheme of the utility model, after-sales personnel can conveniently and quickly locate fault reasons and timely maintain and replace fault electric control.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, and particularly relates to a communication detection circuit and a test tooling. Background Art

[0002] At present, during the after-sales service of air conditioners, it often happens that due to communication failures between the indoor and outdoor units, maintenance personnel cannot immediately locate the fault position. At this time, maintenance personnel need to try methods such as replacing the outdoor electrical installation, the indoor main board, and the connection wires to repair, which are backward and very cumbersome. Summary of the Utility Model

[0003] The main purpose of the utility model is to provide a communication detection circuit and a test tooling, aiming to facilitate after-sales personnel to quickly locate the cause of the fault and timely repair and replace the faulty electronic control.

[0004] To achieve the above purpose, the communication detection circuit proposed by the utility model includes:

[0005] An indoor unit simulation circuit, an outdoor unit simulation circuit, and a monitoring circuit;

[0006] A communication line interface for accessing the communication line of the device under test and being electrically connected to the indoor unit simulation circuit, the outdoor unit simulation circuit, and the monitoring circuit respectively;

[0007] A control chip is electrically connected to the indoor unit simulation circuit, the outdoor unit simulation circuit, and the monitoring circuit respectively. When the device under test includes an outdoor unit, the control chip is further configured to establish a communication connection with the outdoor unit through the indoor unit simulation circuit to detect faults of the outdoor unit; and when the device under test includes an indoor unit, establish a communication connection with the indoor unit through the outdoor unit simulation circuit to detect faults of the indoor unit;

[0008] When the device under test includes an indoor unit, establish a communication connection with the indoor unit through the outdoor unit simulation circuit to detect faults of the indoor unit;

[0009] The control chip is further configured to monitor the communication signals transmitted through the communication line through the monitoring circuit.

[0010] In some embodiments, the outdoor unit simulation circuit includes:

[0011] A first control circuit, the controlled end of which is electrically connected to the control chip;

[0012] A first communication circuit having a first communication end, a first sending end, and a first receiving end. The first communication end is electrically connected to the communication line interface through the first control circuit, and the first receiving end and the first sending end are electrically connected to the control chip respectively;

[0013] The first control circuit is used to connect or disconnect the communication line interface of the first communication end under the control of the control chip.

[0014] In some embodiments, the communication detection circuit further includes:

[0015] A first neutral wire interface for accessing the neutral wire;

[0016] The first communication circuit further has a first ground terminal, and the first ground terminal is electrically connected to the first neutral wire interface;

[0017] The first communication circuit is specifically configured to transmit a communication signal between the first neutral wire interface and the communication line interface when the device under test includes an indoor unit.

[0018] In some embodiments, the indoor unit simulation circuit includes:

[0019] A second control circuit, and a controlled end of the second control circuit is electrically connected to the control chip;

[0020] A second communication circuit having a second communication end, a second sending end, and a second receiving end. The second communication end is electrically connected to the communication line interface through the second control circuit, the second receiving end is electrically connected to the control chip through the second control circuit, and the second sending end is electrically connected to the control chip;

[0021] The second control circuit is used to connect or disconnect the second receiving end and the control chip, and to connect or disconnect the second communication end and the communication line interface under the control of the control chip.

[0022] In some embodiments, the communication detection circuit further includes:

[0023] A live wire interface for accessing the live wire;

[0024] The second communication circuit further has a power supply terminal, and the power supply terminal is electrically connected to the live wire interface;

[0025] The second communication circuit is specifically configured to transmit a communication signal between the live wire interface and the communication line interface when the device under test includes an outdoor unit.

[0026] In some embodiments, the monitoring circuit includes:

[0027] A sampling circuit, a sampling end of the sampling circuit is electrically connected to the communication line interface, and an output end of the sampling circuit is connected to the control chip;

[0028] A third control circuit, the input end of the third control circuit is connected to the ground end of the sampling circuit, and the controlled end of the third control circuit is connected to the control chip, and is used to turn on or off the current loop where the sampling circuit is located under the control of the control chip;

[0029] The sampling circuit is further configured to output the collected communication signal to the control chip after isolation processing when the current loop where it is located is turned on.

[0030] In some embodiments, the communication detection circuit further includes:

[0031] A second neutral wire interface for accessing the neutral wire;

[0032] The third control circuit further has a second ground end, and the second ground end is electrically connected to the second neutral wire interface;

[0033] The sampling circuit is specifically configured to collect the communication signal between the second neutral wire interface and the communication wire interface when the third control circuit is turned on.

[0034] In some embodiments, the sampling circuit includes:

[0035] A first resistor, the first end of which is electrically connected to the communication wire interface;

[0036] A second resistor and a third resistor, the first end of the second resistor is electrically connected to the control chip, and the third resistor is connected in series between the second end of the second resistor and the ground;

[0037] A first capacitor, connected in series between the second end of the second resistor and the ground;

[0038] A first diode, the anode of which is connected to the second end of the first resistor;

[0039] A first optocoupler, the first end of the receiving side of which is used to access the power supply, the second end of the receiving side of which is connected to the second end of the second resistor, the first end of the emitting side of which is connected to the cathode of the first diode, and the second end of the emitting side of which is electrically connected to the third control circuit.

[0040] In some embodiments, the third control circuit includes:

[0041] A fourth resistor and a fifth resistor, the first end of the fourth resistor is connected to the control chip, and the fifth resistor is connected in series between the second end of the fourth resistor and the ground;

[0042] A second optocoupler, the first end of the emitting side of which is connected to the second end of the fourth resistor, the second end of the emitting side of which is grounded, the first end of the receiving side of which is electrically connected to the sampling circuit, and the second end of the receiving side of which is used to access the neutral wire.

[0043] The present utility model also provides a test tooling, which is applied to an air conditioner and includes an electronic control board and the above-mentioned communication detection circuit. The communication detection circuit is used for electrically connecting with the indoor unit or the outdoor unit of the air conditioner.

[0044] Through the technical solution of the present utility model, by setting up an indoor unit simulation circuit, it jointly simulates the indoor unit with the control chip and communicates with the outdoor unit to be tested, so as to realize the fault detection of the outdoor unit. By setting up an outdoor unit simulation circuit, it jointly simulates the outdoor unit with the control chip and communicates with the indoor unit to be tested, so as to realize the fault detection of the indoor unit. And by monitoring the communication signals transmitted through the communication line by the monitoring circuit, the usage conditions of the receiving and transmitting lines are determined, so as to quickly locate faults in the indoor unit, the outdoor unit and the communication line. Description of the Drawings

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0046] Figure 1 It is a schematic structural diagram of an embodiment of the communication detection circuit of the present utility model;

[0047] Figure 2 It is a schematic structural diagram of an embodiment of the outdoor unit simulation circuit in the present utility model;

[0048] Figure 3 It is a schematic structural diagram of another embodiment of the outdoor unit simulation circuit in the present utility model;

[0049] Figure 4 It is a schematic structural diagram of an embodiment of the indoor unit simulation circuit in the present utility model;

[0050] Figure 5 It is a schematic structural diagram of another embodiment of the indoor unit simulation circuit in the present utility model;

[0051] Figure 6 It is a schematic structural diagram of an embodiment of the monitoring circuit in the present utility model;

[0052] Figure 7 It is a circuit connection diagram of an embodiment of the communication detection circuit of the present utility model;

[0053] Figure 8 It is a circuit connection diagram of an embodiment of the monitoring circuit in the present utility model.

[0054] Explanation of the Reference Numerals in the Drawings:

[0055] Label Name Label Name 100 Communication line interface 500 Control chip 200 External unit simulation circuit 600 First neutral wire interface 210 First control circuit 700 Live wire interface 220 First communication circuit 800 Second neutral wire interface 300 Internal unit simulation circuit U1 - U8 First optocoupler - Eighth optocoupler 310 Second control circuit Q1 - Q6 First switching transistor - Sixth switching transistor 320 Second communication circuit TZ1 - TZ5 First voltage regulator diode - Fifth voltage regulator diode 400 Monitoring circuit D1 - D5 First diode - Fifth diode 410 Sampling circuit C1 - C12 First capacitor - Twelfth capacitor 420 Third control circuit R1 - R33 First resistor - Thirty-third resistor

[0056] The realization, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0057] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0058] In addition, in the present utility model, descriptions such as "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0059] The present utility model provides a communication detection circuit.

[0060] Referring to Figure 1 , in an embodiment, the communication detection circuit includes:

[0061] An indoor unit simulation circuit 300, an outdoor unit simulation circuit 200, and a monitoring circuit 400;

[0062] A communication line interface 100, which is used to access the communication line of the device under test and is electrically connected to the indoor unit simulation circuit 300, the outdoor unit simulation circuit 200, and the monitoring circuit 400 respectively;

[0063] A control chip 500, which is electrically connected to the indoor unit simulation circuit 300, the outdoor unit simulation circuit 200, and the monitoring circuit 400 respectively. The control chip 500 is further used to establish a communication connection with the outdoor unit through the indoor unit simulation circuit 300 to detect faults of the outdoor unit when the device under test includes an outdoor unit; and,

[0064] Establish a communication connection with the indoor unit through the outdoor unit simulation circuit 200 to detect faults of the indoor unit when the device under test includes an indoor unit;

[0065] The control chip 500 is further used to monitor the communication signals transmitted through the communication line through the monitoring circuit 400.

[0066] In this embodiment, when a user faces an air conditioner that requires after-sales maintenance, in order to detect the indoor unit, outdoor unit, and communication line of the air conditioner one by one, the communication line interface 100 needs to be connected to the communication port of the outdoor unit and the communication port of the indoor unit in sequence, so as to output corresponding control signals through the control chip 500 to control the corresponding circuit to work.

[0067] Specifically, when the user detects the outdoor unit to be tested, the communication line interface 100 is connected to the communication port of the outdoor unit to be tested, and corresponding outdoor unit detection instructions are output to the control chip 500 through an external interaction component, such as a host computer, a computer, a touch screen, etc. At this time, the control chip 500 outputs an enable signal to the indoor unit simulation circuit 300 according to the outdoor unit detection instructions to control the indoor unit simulation circuit 300 to be turned on. Thus, the control chip 500 and the indoor unit simulation circuit 300 jointly form an analog indoor unit, and a data transmission closed-loop is formed with the communication circuit inside the outdoor unit to be tested through the communication line interface 100. Therefore, the control chip 500 can detect whether the outdoor unit is faulty or the location of the fault by transmitting communication signals with the outdoor unit to be tested.

[0068] When the user detects the indoor unit to be tested, the communication line interface 100 is connected to the communication port of the indoor unit to be tested, and corresponding indoor unit detection instructions are output to the control chip 500 through the external interaction component. At this time, the control chip 500 outputs an enable signal to the outdoor unit simulation circuit 200 according to the indoor unit detection instructions to control the outdoor unit simulation circuit 200 to be turned on. Thus, the control chip 500 and the outdoor unit simulation circuit 200 jointly form an analog outdoor unit, and a data transmission closed-loop is formed with the indoor unit to be tested through the communication line interface 100 to detect whether the indoor unit is faulty or the location of the fault.

[0069] When the user detects the communication line of the air conditioner to be tested, the communication line interface 100 is connected to the communication port of the indoor unit or the outdoor unit, and corresponding communication line detection instructions are output to the control chip 500 through the external interaction component. At this time, the control chip 500 outputs an enable signal to the monitoring circuit 400 according to the communication line detection instructions to control the monitoring circuit 400 to be turned on. Therefore, the control chip 500 collects the communication signals between the indoor unit and the outdoor unit through the monitoring circuit 400, and thus detects a communication line fault when no communication signal is collected.

[0070] The technical solution of the present utility model realizes the fault detection of the external machine by setting up an internal machine simulation circuit 300, which jointly simulates the internal machine with the control chip 500 and communicates with the external machine to be tested. By setting up an external machine simulation circuit 200, which jointly simulates the external machine with the control chip 500 and communicates with the internal machine to be tested, the fault detection of the internal machine is realized. And by monitoring the communication signals transmitted through the communication line by the monitoring circuit 400, the usage of the sending and receiving lines is determined, so as to quickly locate the faults in the internal and external machines and the communication line.

[0071] Referring to Figure 1 and Figure 2 , in an embodiment, the external machine simulation circuit 200 includes:

[0072] A first control circuit 210, the controlled end of the first control circuit 210 is electrically connected to the control chip 500;

[0073] A first communication circuit 220, having a first communication end, a first sending end and a first receiving end, the first communication end is electrically connected to the communication line interface 100 through the first control circuit 210, and the first receiving end and the first sending end are respectively electrically connected to the control chip 500;

[0074] The first control circuit 210 is used to connect or disconnect the first communication end communication line interface 100 under the control of the control chip 500.

[0075] In this embodiment, the first control circuit 210 is controlled by the control chip 500, that is, it conducts when receiving the above-mentioned enable signal, connects the first communication circuit 220 to the communication line interface 100, so that the control chip 500 can communicate and transmit with the internal machine to be tested through the first communication circuit 220.

[0076] Referring to Figures 1 to 3 , in an embodiment, the communication detection circuit further includes:

[0077] A first neutral wire interface 600, used to access the neutral wire;

[0078] The first communication circuit 220 further has a first ground end, and the first ground end is electrically connected to the first neutral wire interface 600;

[0079] The first communication circuit 220 is specifically used to transmit the communication signal between the first neutral wire interface 600 and the communication line interface 100 when the device to be tested includes an internal machine.

[0080] In this embodiment, the devices to be tested all use zero-fire wire communication. Therefore, when the device to be tested is an internal machine, the signal received through the communication line interface 100 needs to return to the first neutral wire interface 600 to form a closed loop.

[0081] Specifically, the first control circuit 210 includes:

[0082] The first switching transistor Q1 has a first input terminal, a first controlled terminal, and a first output terminal;

[0083] The sixth resistor R6 has its first end connected to a power supply and its second end connected to the first input terminal;

[0084] The seventh resistor R7 is connected in series between the control chip 500 and the first controlled terminal;

[0085] The eighth resistor R8 is connected in series between the first output terminal and the ground;

[0086] The third optocoupler U3 has its light-emitting side connected in series between the first output terminal and the ground, its receiving side's first end connected to the communication line interface 100, and its receiving side's second end connected to the first communication terminal of the first communication circuit 220.

[0087] The first communication circuit 220 includes:

[0088] The second switching transistor Q2 has a second controlled terminal, a second input terminal, and a second output terminal;

[0089] The third switching transistor Q3 has a third controlled terminal, a second input terminal, and a third output terminal, and its third input terminal is grounded;

[0090] The ninth resistor R9 is connected in series between the main control chip and the second controlled terminal;

[0091] The tenth resistor R10 has its first end connected to a power supply and its second end connected to the second input terminal;

[0092] The eleventh resistor R11 is connected in series between the second output terminal and the ground;

[0093] The fourth optocoupler U4 has its light-emitting side connected in series between the second output terminal and the ground;

[0094] The thirteenth resistor R13 and the fourteenth resistor R14, the first end of the thirteenth resistor R13 is connected to the control chip 500, the first end of the fourteenth resistor R14 is connected to a power supply, and the second end of the fourteenth resistor R14 is respectively connected to the second end of the thirteenth resistor R13 and the third input terminal;

[0095] The fifteenth resistor R15 and the sixteenth resistor R16, the first end of the sixteenth resistor R16 is connected to a power supply, and the fifteenth resistor R15 is connected in series between the third controlled terminal and the second end of the sixteenth resistor R16;

[0096] The fourth capacitor C4 is connected in series between the first end of the thirteenth resistor R13 and the ground;

[0097] The fifth capacitor C5 is connected in series between the third controlled terminal and the ground;

[0098] The fifth optocoupler U5, whose receiving side is connected in series between the second end of the sixteenth resistor R16 and the ground, and the second end of whose emitting side is connected to the first neutral wire interface 600;

[0099] The first voltage stabilizing diode TZ1 and the second voltage stabilizing diode TZ2 are connected in series in turn between the first end of the receiving side of the fourth optocoupler U4 and the first neutral wire interface 600;

[0100] The second diode D2, whose anode is electrically connected to the first control circuit 210;

[0101] The second capacitor C2 is connected in series between the first end of the receiving side of the fourth optocoupler U4 and the ground;

[0102] The third capacitor C3 is connected in series between the anode of the second diode D2 and the first neutral wire interface 600;

[0103] The sixth capacitor C6 is connected in series across both ends of the emitting side of the fifth optocoupler U5;

[0104] The twelfth resistor R12 is connected in series between the first end of the receiving side of the fourth optocoupler U4 and the cathode of the second diode D2.

[0105] The seventeenth resistor R17 is connected in series across both ends of the emitting side of the fifth optocoupler U5;

[0106] Refer to Figure 1 and Figure 4 , in an embodiment, the indoor unit simulation circuit 300 includes:

[0107] The second control circuit 310, the input end of the second control circuit 310 is electrically connected to the control chip 500;

[0108] The second communication circuit 320 has a second communication end, a second sending end and a second receiving end. The second communication end is electrically connected to the communication line interface 100 through the second control circuit 310. The second receiving end is electrically connected to the control chip 500 through the second control circuit 310. The second sending end is electrically connected to the control chip 500;

[0109] The second control circuit 310 is configured to connect or disconnect the second receiving end and the control chip 500, and connect or disconnect the second communication end and the communication line interface 100 under the control of the control chip 500.

[0110] In this embodiment, the first control circuit 210 is controlled by the control chip 500, that is, it conducts when receiving the above-mentioned enable signal, connects the first communication circuit 220 and the communication line interface 100, so that the control chip 500 can communicate and transmit with the measured indoor unit through the first communication circuit 220.

[0111] Refer to Figure 1 , Figure 4 andFigure 5 , in one embodiment, the communication detection circuit further includes:

[0112] A live wire interface 700 for accessing the live wire;

[0113] The second communication circuit 320 further has a power supply terminal, and the power supply terminal is electrically connected to the live wire interface 700;

[0114] The second communication circuit 320 is specifically configured to transmit communication signals between the live wire interface 700 and the communication line interface 100 when the device under test includes an outdoor unit.

[0115] In this embodiment, the devices under test all perform zero - live - wire communication. Therefore, when the device under test is an outdoor unit, the live wire interface 700 and the communication line interface 100 form a closed loop to achieve signal transmission.

[0116] Specifically, the second control circuit 310 includes:

[0117] A fourth switching transistor Q4 having a fourth input pin, a fourth controlled pin, and a fourth output pin;

[0118] An eighteenth resistor R18, whose first end is used to access the power supply, and whose second end is connected to the fourth input pin;

[0119] A nineteenth resistor R19 is connected in series between the control chip 500 and the fourth controlled pin;

[0120] A twentieth resistor R20 is connected in series between the fourth output pin and the ground;

[0121] A fifth optocoupler U5, whose light - emitting side is connected in parallel across both ends of the twentieth resistor R20, and whose second end of the receiving side is connected to the control chip 500;

[0122] A thirty - second resistor R32 is connected in series between the fourth output pin and the ground;

[0123] A sixth optocoupler U6, whose light - emitting side is connected in parallel across both ends of the thirty - second resistor R32, and whose second end of the receiving side is electrically connected to the communication line interface 100;

[0124] The second communication circuit 320 includes:

[0125] A fifth switching transistor Q5 having a fifth input pin, a fifth controlled pin, and a fifth output pin;

[0126] A sixth switching transistor Q6 having a sixth input pin, a sixth controlled pin, and a sixth output pin, and the sixth controlled pin is grounded;

[0127] A twenty - first resistor R21 is connected in series between the first end of the receiving side of the fifth optocoupler U5 and the fifth input pin;

[0128] The twenty-second resistor R22, whose first end is used to connect to a power supply and whose second end is connected to the fifth input pin of the ground;

[0129] The twenty-third resistor R23 is connected in series between the fifth controlled pin and the second end of the twenty-fourth resistor R24;

[0130] The seventh capacitor C7 is connected in series between the first end of the receiving side of the fifth optocoupler U5 and the ground;

[0131] The eighth capacitor C8 is connected in series between the fifth controlled pin and the ground;

[0132] The seventh optocoupler U7, whose receiving side is connected in series between the second end of the twenty-fourth resistor R24 and the ground;

[0133] The twenty-eighth resistor R28 and the twenty-ninth resistor R29. The twenty-eighth resistor R28 is connected in series between the control chip 500 and the sixth controlled pin, and the twenty-ninth resistor R29 is connected in series between the sixth controlled pin and the ground;

[0134] The thirtieth resistor R30 and the thirty-first resistor R31. The first end of the thirtieth resistor R30 is used to connect to a power supply, and the thirty-first resistor R31 is connected in series between the second end of the thirtieth resistor R30 and the sixth input pin;

[0135] The eighth optocoupler U8, whose light-emitting side is connected in parallel across both ends of the thirty-first resistor R31;

[0136] The third voltage regulator diode TZ3 and the fourth voltage regulator diode TZ4 are connected in series in sequence between the first end of the light-emitting side of the seventh optocoupler U7 and the second end of the receiving side of the eighth optocoupler U8;

[0137] The fifth voltage regulator diode TZ5, whose cathode is connected to the first end of the light-emitting side of the seventh optocoupler U7 and whose anode is connected to the first zero-line interface 600;

[0138] The third diode D3, whose cathode is connected to the first end of the light-emitting side of the seventh optocoupler U7;

[0139] The fourth diode D4, whose anode is connected to the first end of the light-emitting side of the seventh optocoupler U7;

[0140] The fifth diode D5, whose anode is connected to the second end of the receiving side of the eighth optocoupler U8;

[0141] The ninth capacitor C9 is connected in parallel across the light-emitting side of the seventh optocoupler U7;

[0142] The tenth capacitor C10 is connected in parallel between the first end of the light-emitting side of the seventh optocoupler U7 and the second end of the receiving side of the eighth optocoupler U8;

[0143] The eleventh capacitor C11 and the twelfth capacitor C12 are respectively connected in parallel across both ends of the fifth voltage regulator diode TZ5;

[0144] The twenty-fifth resistor R25 is connected in parallel to the light-emitting side of the seventh optocoupler U7.

[0145] For the twenty-sixth resistor R26 and the twenty-seventh resistor R27, the first end of the twenty-seventh resistor R27 is used to connect to the live wire interface 700, and the twenty-sixth resistor R26 is connected in series between the anode of the third diode D3 and the second end of the twenty-seventh resistor R27.

[0146] For the thirty-third resistor R33, its first end is connected to the first end of the receiving side of the sixth optocoupler U6, and its second end is respectively connected to the cathode of the fifth diode D5 and the cathode of the fourth diode D4.

[0147] Refer to Figure 1 and Figure 6 , in an embodiment, the monitoring circuit 400 includes:

[0148] A sampling circuit 410, the sampling end of the sampling circuit 410 is electrically connected to the communication line interface 100, and the output end of the sampling circuit 410 is connected to the control chip 500;

[0149] A third control circuit 420, the input end of the third control circuit 420 is connected to the ground end of the sampling circuit 410, and the controlled end of the third control circuit 420 is connected to the control chip 500, and is used to turn on or off the current loop where the sampling circuit 410 is located under the control of the control chip 500;

[0150] The sampling circuit 410 is further used to, when the current loop where it is located is turned on, isolate the collected communication signal and then output it to the control chip 500.

[0151] The communication detection circuit further includes:

[0152] A second neutral wire interface 800, which is used to connect to the neutral wire;

[0153] The third control circuit 420 further has a second ground end, and the second ground end is electrically connected to the second neutral wire interface 800;

[0154] Specifically, the sampling circuit 410 is used to collect the communication signal between the second neutral wire interface 800 and the communication line interface 100 when the third control circuit 420 is turned on.

[0155] In this embodiment, since the air conditioner detected in this application uses zero-line and live-line communication, the communication signal collected by the communication line interface 100 is a high-voltage signal. However, the control chip 500 is a weak electrical device with a low withstand voltage value for its pins and cannot directly receive the high-voltage signal. Therefore, a sampling circuit 410 is provided. When the user needs to detect the communication line of the air conditioner under test, the control chip 500 outputs an enable signal to the third control circuit 420 to control the third control circuit 420 to conduct, so that a current loop can be formed from the communication line interface 100 through the sampling circuit 410 to the second neutral line interface 800 as a signal transmission branch. At this time, when the indoor unit and the outdoor unit are transmitting data, the communication signal will be collected through this signal transmission branch, and the collected communication signal will be processed by the sampling signal for voltage conversion and isolation processing, so that when the control chip 500 receives the weak-current communication signal, it will not be interfered due to being grounded together with the high-voltage part of the circuit.

[0156] Refer to Figure 1 、 Figure 6 and Figure 8 , in one embodiment, the sampling circuit 410 includes:

[0157] A first resistor R1, whose first end is electrically connected to the communication line interface 100;

[0158] A second resistor R2 and a third resistor R3. The first end of the second resistor R2 is electrically connected to the control chip 500, and the third resistor R3 is connected in series between the second end of the second resistor R2 and the ground;

[0159] A first capacitor C1, connected in series between the second end of the second resistor R2 and the ground;

[0160] A first diode D1, whose anode is connected to the second end of the first resistor R1;

[0161] A first optocoupler U1. The first end of its receiving side is used to connect to the power supply, the second end of its receiving side is connected to the second end of the second resistor R2, the first end of its emitting side is connected to the cathode of the first diode D1, and the second end of its emitting side is electrically connected to the third control circuit 420.

[0162] In this embodiment, the first optocoupler U1 is used to isolate the communication line interface 100 from the main control chip. When communication data is transmitted in the communication line interface 100, the emitting side of the first optocoupler U1 will work or not work according to the level of the communication data. The receiving side of the first optocoupler U1 will connect or disconnect the power supply according to the lighting situation of the emitting side, so as to process the power supply into weak-current voltages of different levels. The second resistor R2 and the third resistor R3 shunt the weak-current voltage output by the receiving end of the first optocoupler U1, and are combined with the first capacitor C1 into an RC filter circuit to further protect the control chip 500.

[0163] Reference Figure 1 、 Figure 6 and Figure 8 , in one embodiment, the third control circuit 420 includes:

[0164] A fourth resistor R4 and a fifth resistor R5. The first end of the fourth resistor R4 is connected to the control chip 500, and the fifth resistor R5 is connected in series between the second end of the fourth resistor R4 and the ground;

[0165] A second optocoupler U2. The first end of its light-emitting side is connected to the second end of the fourth resistor R4, the second end of its light-emitting side is grounded, the first end of its receiving side is electrically connected to the sampling circuit 410, and the second end of its receiving side is used to connect to the neutral line.

[0166] In this embodiment, the communication line interface 100, the first resistor R1, the first diode D1, the light-emitting side of the first optocoupler U1, the receiving side of the second optocoupler U2, and the second neutral line interface 800 form a current loop. When the control chip 500 outputs an enabling signal with a high level to the light-emitting side of the second optocoupler U2, the receiving side is photosensitive and conducts, so that the current loop is connected, and thus the acquisition circuit can acquire communication data. When the control chip 500 stops outputting an enabling signal with a high level to the light-emitting side of the second optocoupler U2, the receiving side is turned off, so that the current loop is disconnected, and thus the acquisition circuit cannot acquire communication data.

[0167] The present invention also provides a test tooling, which includes an electronic control board and a communication detection circuit. The specific structure of the communication detection circuit refers to the above embodiment. Since this test tooling adopts all the technical solutions of the above all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated here one by one.

[0168] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A communication detection circuit, characterized in that, It includes: An indoor unit simulation circuit, an outdoor unit simulation circuit, and a monitoring circuit; A communication line interface for accessing the communication line of the device under test and electrically connected to the indoor unit simulation circuit, the outdoor unit simulation circuit, and the monitoring circuit respectively; A control chip electrically connected to the indoor unit simulation circuit, the outdoor unit simulation circuit, and the monitoring circuit respectively. When the device under test includes an outdoor unit, the control chip is further configured to establish a communication connection with the outdoor unit through the indoor unit simulation circuit to detect faults of the outdoor unit; and when The device under test includes an indoor unit, establish a communication connection with the indoor unit through the outdoor unit simulation circuit to detect faults of the indoor unit; The control chip is further configured to monitor the communication signals transmitted through the communication line through the monitoring circuit.

2. The communication detection circuit according to claim 1, wherein The outdoor unit simulation circuit includes: A first control circuit, the controlled end of which is electrically connected to the control chip; A first communication circuit having a first communication end, a first sending end, and a first receiving end. The first communication end is electrically connected to the communication line interface through the first control circuit, and the first receiving end and the first sending end are electrically connected to the control chip respectively; The first control circuit is configured to connect or disconnect the first communication end and the communication line interface under the control of the control chip.

3. The communication detection circuit according to claim 2, wherein The communication detection circuit further includes: A first neutral line interface for accessing the neutral line; The first communication circuit further has a first ground terminal, which is electrically connected to the first neutral line interface; Specifically, when the device under test includes an indoor unit, the first communication circuit is configured to transmit the communication signals between the first neutral line interface and the communication line interface.

4. The communication detection circuit according to claim 1, wherein The indoor unit simulation circuit includes: A second control circuit, the controlled end of which is electrically connected to the control chip; A second communication circuit having a second communication end, a second sending end, and a second receiving end. The second communication end is electrically connected to the communication line interface through the second control circuit, the second receiving end is electrically connected to the control chip through the second control circuit, and the second sending end is electrically connected to the control chip; The second control circuit is configured to connect or disconnect the second receiving end and the control chip, and connect or disconnect the second communication end and the communication line interface under the control of the control chip.

5. The communication detection circuit according to claim 4, wherein The communication detection circuit further includes: A live wire interface for accessing the live wire; The second communication circuit further has a power supply terminal, which is electrically connected to the live wire interface; Specifically, when the device under test includes an outdoor unit, the second communication circuit is configured to transmit the communication signals between the live wire interface and the communication line interface.

6. The communication detection circuit according to claim 1, wherein The monitoring circuit includes: A sampling circuit, the sampling end of which is electrically connected to the communication line interface, and the output end of which is connected to the control chip; A third control circuit, the input end of which is connected to the ground terminal of the sampling circuit, and the controlled end of which is connected to the control chip, and is configured to connect or disconnect the current loop where the sampling circuit is located under the control of the control chip; The sampling circuit is further configured to isolate the collected communication signal and output it to the control chip when the current loop where it is located is turned on.

7. The communication detection circuit according to claim 6, wherein The communication detection circuit further includes: A second neutral wire interface for connecting to the neutral wire; The third control circuit further has a second ground terminal, and the second ground terminal is electrically connected to the second neutral wire interface; The sampling circuit is specifically configured to collect the communication signal between the second neutral wire interface and the communication line interface when the third control circuit is turned on.

8. The communication detection circuit according to claim 7, wherein The sampling circuit includes: A first resistor, whose first end is electrically connected to the communication line interface; A second resistor and a third resistor, the first end of the second resistor is electrically connected to the control chip, and the third resistor is connected in series between the second end of the second resistor and the ground; A first capacitor, connected in series between the second end of the second resistor and the ground; A first diode, whose anode is connected to the second end of the first resistor; A first optocoupler, the first end of its receiving side is used to connect to the power supply, the second end of its receiving side is connected to the second end of the second resistor, the first end of its emitting side is connected to the cathode of the first diode, and the second end of its emitting side is electrically connected to the third control circuit.

9. The communication detection circuit according to claim 7, wherein The third control circuit includes: A fourth resistor and a fifth resistor, the first end of the fourth resistor is connected to the control chip, and the fifth resistor is connected in series between the second end of the fourth resistor and the ground; A second optocoupler, the first end of its emitting side is connected to the second end of the fourth resistor, the second end of its emitting side is grounded, the first end of its receiving side is electrically connected to the sampling circuit, and the second end of its receiving side is used to connect to the neutral wire.

10. A test tooling, applied to an air conditioner, characterized in that It includes an electronic control board and the communication detection circuit according to any one of claims 1-9, and the communication detection circuit is used to be electrically connected to the indoor unit or the outdoor unit of the air conditioner.

Images