Channel selection circuit, method and air conditioner

Abstract

The application discloses a channel selection circuit, a method and an air conditioner, wherein the channel selection circuit comprises: a first selection circuit comprising a plurality of first channels for accessing a jumper cap circuit; a second selection circuit comprising a plurality of second channels; a switch assembly; and a master control chip electrically connected with the first selection circuit, the second selection circuit and the switch assembly, respectively. The master control chip comprises an identification mode, which is used for controlling the first selection circuit to connect the plurality of first channels respectively, so as to access first identification data output by the jumper cap circuit, and when in the identification mode, judging state information of the first selection circuit according to the first identification data and preset reference identification data. When it is determined that the state information comprises an abnormal state, the master control chip is further used for controlling the switch assembly to connect, so as to connect the second selection circuit with the jumper cap circuit. The technical scheme of the application aims to reduce the situation that the unit function fails due to the abnormal jumper cap circuit number identified.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, and in particular to a channel selection circuit, method, and air conditioner. Background Technology

[0002] Currently, with the development of air conditioning technology and the continuous increase in load demand, the number of I / O ports of the main control chip on the motherboard often cannot meet the demand. Therefore, channel selection chips are often used on current air conditioning motherboards to expand the I / O ports and connect to multiple corresponding jumper circuits. The identification number of the jumper circuit is closely related to the type of air conditioner.

[0003] However, in actual use and experimental testing, it was found that because there are no protective components at the jumper cap circuit interface circuit, the channel selection chip used for the jumper cap circuit is often damaged due to static electricity, which causes the main control chip to recognize the jumper cap circuit number abnormally, resulting in malfunction and affecting the normal operation of the unit. Summary of the Invention

[0004] The main objective of this invention is to provide a channel selection circuit, method, and air conditioner that aims to reduce unit malfunctions caused by abnormal jumper cap circuit numbers.

[0005] To achieve the above objectives, the channel selection circuit proposed in this invention is applied to an air conditioner, which includes a corresponding jumper cap circuit, comprising:

[0006] The first selection circuit includes a plurality of first channels for accessing the jumper cap circuit;

[0007] The second selection circuit includes multiple second channels;

[0008] A switching assembly is connected in series between multiple second channels and the jumper cap circuit;

[0009] The main control chip is electrically connected to the first selection circuit, the second selection circuit, and the switch assembly, respectively. The main control chip includes an identification mode, which is used to control the first selection circuit to turn on multiple first channels respectively to access the first identification data output by the jumper cap circuit. When in the identification mode, the chip determines the status information of the first selection circuit based on the first identification data and the preset reference identification data.

[0010] When the status information is determined to include an abnormal status, the main control chip is also used to control the switch assembly to turn on, connecting the second selection circuit with the jumper cap circuit.

[0011] In some embodiments, the first selection circuit includes at least one first controlled terminal, a first communication terminal, and a plurality of second communication terminals; wherein the plurality of first channels connect the first communication terminal and the plurality of second communication terminals in a one-to-one correspondence, and the first controlled terminal and the first communication terminal are respectively electrically connected to the main control chip;

[0012] The main control chip is also used to periodically receive the first identification data of the jumper cap circuit at preset time intervals, and to output a preset number of channel selection signals to the first controlled terminal in each cycle.

[0013] The first selection circuit is also used to control the first communication terminal to connect multiple second communication terminals respectively according to the channel selection signal of the preset number of times, so as to output the corresponding first identification data to the main control chip.

[0014] In some embodiments, the first identification data includes a first level group, and the reference identification data includes a second level group;

[0015] The first selection circuit is also used to sequentially connect multiple levels output by the jumper cap circuit through multiple second communication terminals according to the channel selection signal of the preset number of times, and output the corresponding first level group through the first communication terminal;

[0016] When the main control chip is in the recognition mode, it is also used to match the received first level group with the second level group, and determine the status information based on the matching result.

[0017] In some embodiments, when the main control chip is in the identification mode, it is specifically configured to match the received first level group with the second level group; if at least one level in the first level group is different from the second level group, it is determined that the status information includes an abnormal status; and,

[0018] If multiple levels in the first level group are the same as multiple levels in the second level group, then the status information is determined to include a normal state.

[0019] In some embodiments, when the main control chip is in the identification mode and the switching component connects the second selection circuit and the jumper cap circuit, it is further configured to control the second selection circuit to connect multiple second channels respectively to access the second identification data output by the jumper cap circuit, and determine the status information of the second selection circuit based on the second identification data and the reference identification data; and,

[0020] When the status information is determined to include an abnormal state, the air conditioner is controlled to stop working and corresponding alarm information is output.

[0021] In some embodiments, the main control chip further includes a detection mode;

[0022] The main control chip is also used to store the first identification data output by the jumper cap circuit into the first selection circuit as reference identification data when the detection mode is in operation.

[0023] In some embodiments, the first selection circuit includes:

[0024] The channel selection chip includes a first communication pin, multiple second communication pins, multiple controlled pins, a power supply pin, and a ground pin. The ground pin is grounded, the power supply pin is used to connect to a first power supply, the multiple second communication pins are connected one-to-one to multiple terminals of the jumper cap circuit, and are electrically connected one-to-one to multiple second channels of the second selection circuit via the switch assembly.

[0025] The first resistor is connected in series between the main control chip and the first communication pin;

[0026] The second resistor has a first end connected to the first power supply and a second end connected to the first communication pin.

[0027] The first capacitor is connected in series between the first terminal of the first resistor and ground.

[0028] In some embodiments, the switching assembly includes:

[0029] The relay includes a coil and multiple contacts, which are connected in series one-to-one between multiple second channels and multiple terminals of the jumper cap circuit. The first end of the coil is used to connect to a second power supply, and the second end of the coil is electrically connected to the main control chip.

[0030] This invention also proposes a channel selection method applied to an air conditioner, the air conditioner including a first selection circuit, a second selection circuit, a switching assembly, and a jumper cap circuit, the method comprising:

[0031] The first selection circuit is controlled to turn on multiple first channels respectively, so as to access the first identification data output by the jumper cap circuit;

[0032] When in the recognition mode, the state information of the first selection circuit is determined based on the first recognition data and the preset reference recognition data;

[0033] When the status information includes an abnormal status, the switch assembly is turned on to connect the second selection circuit and the jumper cap circuit.

[0034] The present invention also proposes an air conditioner, including the channel selection circuit and jumper cap circuit described above, wherein the jumper cap circuit is electrically connected to the channel selection circuit.

[0035] The technical solution of this invention sets reference identification data in the main control chip and controls the first selection circuit to control multiple first channels to conduct respectively, so that the first identification data is conducted. This enables the control chip to verify the identification information of the access jumper cap circuit and judge the status of the channel selection chip. This avoids the chip being unable to control the various modules of the unit normally through the jumper cap circuit due to abnormal status. Furthermore, by setting a second selection circuit, it works when the status information of the first selection circuit includes abnormal status, thereby maintaining the normal operation of the unit, improving the reliability of the air conditioner, and reducing the situation where the unit malfunctions due to abnormal identification of the jumper cap circuit number. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the structure of an embodiment of the channel selection circuit of the present invention;

[0038] Figure 2 This is a schematic flowchart of an embodiment of the channel selection circuit of the present invention;

[0039] Figure 3 This is a schematic flowchart of another embodiment of the channel selection circuit of the present invention;

[0040] Figure 4 This is a circuit connection diagram of an embodiment of the channel selection circuit of the present invention;

[0041] Figure 5 This is a circuit connection diagram of an embodiment of the main control chip of the present invention.

[0042] Explanation of icon numbers:

[0043] label name label name 110 First selection circuit IC1 Channel selection chip 120 Second selection circuit RY1 relay 130 Switching components C1 First capacitor 140 Main control chip R1~R2 First resistor ~ Second resistor

[0044] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0046] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0047] This invention proposes a channel selection circuit.

[0048] Reference Figure 1 In one embodiment, the circuit is applied to an air conditioner, which includes a corresponding jumper cap circuit, comprising:

[0049] The first selection circuit 110 includes a plurality of first channels for accessing the jumper cap circuit;

[0050] The second selection circuit 120 includes multiple second channels;

[0051] Switch assembly 130 is connected in series between the plurality of second channels and the jumper cap circuit;

[0052] The main control chip 140 is electrically connected to the first selection circuit 110, the second selection circuit 120 and the switch assembly 130 respectively. The main control chip 140 includes an identification mode, which is used to control the first selection circuit 110 to turn on multiple first channels respectively to access the first identification data output by the jumper cap circuit. When in the identification mode, the chip determines the status information of the first selection circuit 110 based on the first identification data and the preset reference identification data.

[0053] When the status information is determined to include an abnormal status, the main control chip 140 is also used to control the switch assembly 130 to turn on, connecting the second selection circuit 120 to the jumper cap circuit.

[0054] In this embodiment, in the first selection circuit 110, multiple first channels share a communication port and are electrically connected to the main control chip 140. On the side electrically connected to the jumper cap circuit, multiple communication ports are respectively electrically connected to multiple terminals of the jumper cap circuit.

[0055] Understandably, since the main control board can usually be matched with different models of equipment after production, but the operating parameters (such as power and operating current) of different models of equipment are also different, it is necessary to identify the corresponding model of equipment for appropriate control. Each model of equipment is equipped with a number of corresponding jumper cap circuits, and the numbers of the multiple jumper cap circuits are fixed to a model of equipment. Therefore, by identifying the number of the jumper cap circuit, the model of the equipment can be determined. Similarly, given that the model of the equipment is known, the jumper cap circuit numbers of the equipment model are pre-stored (i.e., pre-stored reference identification data). By detecting the number returned by the jumper cap circuit (i.e., the first identification data in this application), it is possible to detect whether it is working properly.

[0056] Specifically, when the main control board is installed in an air conditioner to control its operation, the main control chip 140 on the main control board pre-stores reference identification data for the jumper cap circuit in the air conditioner. This reference identification data can be a serial number, model number, or special identifier. When the air conditioner is operating, the main control chip 140 needs to identify the jumper cap circuit to determine the air conditioner's model. At this time, the main control chip 140 controls multiple channels of the first selection circuit 110 to be turned on. When each channel is turned on, it connects a port of the main control chip 140 to a connection port of the jumper cap circuit, receiving data output from that port. After multiple connection ports are turned on, the received data is used together as the first identification data for the jumper cap circuit.

[0057] Therefore, based on the received first identification data and the pre-stored reference identification data, the status information of the jumper cap circuit can be determined. When the status information of the jumper cap circuit includes an abnormal state, the second selection circuit 120 is controlled to work so as to receive the data of the jumper cap circuit through the second selection circuit 120. This avoids the jumper cap circuit number identified by the main control chip 140 from being abnormal due to damage to the selection circuit caused by static electricity, which would cause a malfunction and affect the normal operation of the unit.

[0058] The technical solution of this invention sets reference identification data in the main control chip 140 and controls the first selection circuit 110 to control multiple first channels to conduct respectively, so that the first identification data is conducted. This enables the control chip to verify the identification information of the access jumper cap circuit and judge the status of the channel selection chip IC1. This avoids the chip from being unable to control each module of the unit normally through the jumper cap circuit due to abnormal status. Furthermore, by setting a second selection circuit 120, which works when the status information of the first selection circuit 110 includes abnormal status, the normal operation of the unit is maintained, the reliability of the air conditioner is improved, and the situation of unit malfunction caused by abnormal identification of jumper cap circuit numbers is reduced.

[0059] Optionally, such as Figure 4 As shown, the switch assembly 130 includes:

[0060] The relay RY1 includes a coil and multiple contacts. The multiple contacts are connected in series one-to-one between the multiple second channels and the multiple terminals of the jumper cap circuit. The first end of the coil is used to connect to the second power supply, and the second end of the coil is electrically connected to the main control chip 140.

[0061] Reference Figure 1 In one embodiment, the first selection circuit 110 includes at least one first controlled terminal, a first communication terminal, and a plurality of second communication terminals; wherein, the plurality of first channels connect the first communication terminal and the plurality of second communication terminals in a one-to-one correspondence, and the first controlled terminal and the first communication terminal are electrically connected to the main control chip 140 respectively;

[0062] The main control chip 140 is also used to periodically receive the first identification data of the jumper cap circuit at preset time intervals, and to output a preset number of channel selection signals to the first controlled terminal in each cycle.

[0063] The first selection circuit 110 is also used to control the first communication terminal to connect multiple second communication terminals respectively according to the channel selection signal of the preset number of times, so as to output the corresponding first identification data to the main control chip 140.

[0064] In this embodiment, the number of controlled terminals is determined by the number of second communication terminals connected to the jumper cap circuit. The controlled terminals are used to output signals characterizing a specific second communication terminal, for example, using binary signals to determine which second communication terminal is activated. If the main control chip 140 is in identification mode, in order to ensure the accuracy of the connection channel between the first selection circuit 110 and the jumper cap circuit, it is necessary to periodically receive the first identification data of the jumper cap circuit to continuously detect its status information.

[0065] Specifically, the preset time period T is set by the R&D personnel according to actual needs, and can be 30 seconds, 15 seconds, etc. When the main control chip 140 is in recognition mode, after judging the status information based on the first recognition data within one cycle, the preset time period is delayed, and the first recognition data of the jumper cap circuit is received again. During reception, the main control chip 140 outputs a preset number of channel selection signals according to the number of terminals electrically connected to the jumper cap circuit, so as to connect with each terminal of the jumper cap circuit. Therefore, the preset number of times is the same as the number of terminals electrically connected to the jumper cap circuit.

[0066] Therefore, after connecting each terminal of the jumper cap circuit, the first identification data in the current cycle can be obtained, and the status information of the current cycle can be judged.

[0067] Reference Figure 1 In one embodiment, the first identification data includes a first level group, and the reference identification data includes a second level group;

[0068] The first selection circuit 110 is also used to sequentially connect multiple levels output by the jumper cap circuit through multiple second communication terminals according to the channel selection signal of the preset number of times, and output the corresponding first level group through the first communication terminal;

[0069] When the main control chip 140 is in the recognition mode, it is also used to match the received first level group with the second level group and determine the status information based on the matching result.

[0070] In this embodiment of the invention, the first level group is a specific level sequence, so as to... Figure 4 Taking this example, when multiple channels of the first selection circuit 110 are turned on respectively, that is, X is turned on sequentially with X0 to X4, the resulting level sequence is 01001. This level sequence is the first level group. The first level group is then matched with the preset second level group to determine the current state information of the jumper cap circuit.

[0071] Specifically, the main control chip 140 is used to match the received first level group with the second level group. If at least one level in the first level group is different from the second level group, the status information is determined to include an abnormal status; and,

[0072] If multiple levels in the first level group are the same as multiple levels in the second level group, then the status information is determined to include a normal state.

[0073] In this embodiment, taking 01001 as an example for the second level group, if the first level group is 01001, that is, multiple levels in the first level group are equal to the second level group, then the status information is determined to include a normal state, and the main control chip 140 can determine that the first selection circuit 110 can normally connect the corresponding first channel. However, if the first level group is a level sequence such as 01000, 10110, 01110, etc., then at least one level in the first level group is not equal to the second level group, and the status information is determined to include an abnormal state, and the main control chip 140 cannot control the first selection circuit 110 to connect the corresponding first channel.

[0074] Reference Figure 1 and Figure 3 In one embodiment, the main control chip 140 is further configured to, after the control switch assembly 130 connects the second selection circuit 120 to the jumper cap circuit, control the second selection circuit 120 to connect multiple second channels respectively to access the second identification data output by the jumper cap circuit, and determine the status information of the second selection circuit 120 based on the second identification data and the reference identification data; and,

[0075] When the status information is determined to include an abnormal state, the air conditioner is controlled to stop working and corresponding alarm information is output.

[0076] In this embodiment, after the main control chip 140 determines that the first selection circuit 110 is in an abnormal state, that is, the first selection circuit 110 is faulty, the control switch assembly 130 connects the second selection circuit 120 and the jumper cap circuit, and switches to the port connected to the second selection circuit for signal transmission. At this time, the control switch continues to work according to the identification mode, and periodically controls the reception of the second identification data of the second switch circuit.

[0077] If the status information, determined based on the second identification data and the reference identification data, includes an abnormal status, it indicates that the second selection circuit 120 also fails to properly connect the corresponding second channel. In this case, the main control chip 140 cannot output different data to the corresponding module through the corresponding channel. To avoid affecting the normal operation of the unit due to the failure of the second selection channel, the main control chip 140 controls the air conditioner to stop working and outputs corresponding alarm information using the air conditioner's interactive components (such as a display screen, wireless module, etc.).

[0078] Reference Figure 1 and Figure 3 In one embodiment, the main control chip 140 further includes a detection mode;

[0079] The main control chip 140 is also used to, when in the detection mode, connect the first selection circuit 110 to the first identification data output by the jumper cap circuit and store it as reference identification data.

[0080] In this embodiment, since the main control board can be applied to different models of air conditioning units, when controlling a specific air conditioner, it is necessary to first acquire and store the reference identification data corresponding to the jumper cap circuit of the air conditioner to provide a basis for judging the status information in subsequent work.

[0081] Specifically, after connecting the main control board to the air conditioner, the main control chip 140 is set to detection mode. At this time, the main control chip 140 controls multiple channels of the first selection circuit 110 to be turned on respectively. When each channel is turned on, the port of the main control chip 140 is connected to multiple wiring ports of the jumper cap circuit one by one, and the received first identification data is stored as reference identification data.

[0082] Reference Figures 1 to 5 In one embodiment, the first selection circuit 110 includes:

[0083] The channel selection chip IC1 includes a first communication pin, multiple second communication pins, multiple controlled pins, a power supply pin, and a ground pin. The ground pin is grounded, the power supply pin is used to connect to a first power supply, the multiple second communication pins are connected one-to-one to multiple terminals of the jumper cap circuit, and are electrically connected one-to-one to multiple second channels of the second selection circuit 120 via the switch assembly 130.

[0084] The first resistor R1 is connected in series between the main control chip 140 and the first communication pin;

[0085] The second resistor R2 has its first end connected to the first power supply and its second end connected to the first communication pin.

[0086] The first capacitor C1 is connected in series between the first terminal of the first resistor R1 and ground.

[0087] In this embodiment, the channel selection chip IC1 includes, but is not limited to, a 4051 chip. The first resistor R1 is a current-limiting resistor. In the first selection circuit 110, the second resistor R2 is a pull-up resistor, and the first capacitor C1 is a filter capacitor. The main control chip 140 controls multiple controlled pins (A, B, C pins) of the channel selection chip IC1 to enable different second communication pins X0 to X7.

[0088] The main control chip 140 pre-memorizes the correct reference identification data.

[0089] Initially, the main control chip 140 uses port jump1 to acquire the first identification data and controls the switch assembly 130 to turn off. At this time, the channel selection chip IC1 is connected to the circuit, while the second selection circuit 120 is not connected. After receiving the first identification data, the main control chip 140 determines whether the first identification data is the pre-memorized reference identification data. If so, it considers the channel selection chip IC1 to be in a normal state and maintains the current control state. It then periodically checks whether the first identification data is correct at preset time intervals.

[0090] If the first identification data is incorrect, the channel selection chip IC1 is considered to be in an abnormal state and needs to be replaced with the second selection circuit 120 connected to the jumper cap circuit. At this time, the control switch assembly 130 is turned on, and the second selection circuit 120 is connected to the circuit.

[0091] Reference Figure 2 In one embodiment, the air conditioner includes a first selection circuit, a second selection circuit, a switch assembly, and a jumper cap circuit; the method includes:

[0092] S210. Control the first selection circuit to turn on multiple first channels respectively, so as to access the first identification data output by the jumper cap circuit;

[0093] S220. Determine the state information of the first selection circuit based on the first identification data and the preset reference identification data;

[0094] S230. When the status information includes an abnormal status, control the switch assembly to turn on, and connect the second selection circuit to the jumper cap circuit.

[0095] In this embodiment, when the main control board is installed on an air conditioner to control its operation, the main control chip on the main control board pre-stores reference identification data for the jumper cap circuit in the air conditioner. When the air conditioner is operating, the main control chip needs to identify the jumper cap circuit to determine the air conditioner's model. At this time, the main control chip controls multiple channels of the first selection circuit to be turned on. When each channel is turned on, it connects a port of the main control chip to a connection port of the jumper cap circuit, receiving data output from that port. After multiple connection ports are turned on, the received data is used together as the first identification data for the jumper cap circuit.

[0096] The present invention also proposes an air conditioner, which includes a channel selection circuit and a jumper cap circuit. The jumper cap circuit is electrically connected to the channel selection circuit. The specific structure of the channel selection circuit is as described in the above embodiments. Since the air conditioner adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0097] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A channel selection circuit, applied to an air conditioner, the air conditioner including a corresponding jumper cap circuit, characterized in that, The channel selection circuit includes: The first selection circuit includes a plurality of first channels for accessing the jumper cap circuit; The second selection circuit includes multiple second channels; A switching assembly is connected in series between multiple second channels and the jumper cap circuit; The main control chip is electrically connected to the first selection circuit, the second selection circuit, and the switch assembly, respectively. The main control chip includes an identification mode, which is used to control the first selection circuit to turn on multiple first channels respectively to access the first identification data output by the jumper cap circuit. When in the identification mode, the chip determines the status information of the first selection circuit based on the first identification data and the preset reference identification data. When the status information is determined to include an abnormal status, the main control chip is also used to control the switch assembly to turn on, connecting the second selection circuit to the jumper cap circuit; When the main control chip is in the recognition mode and the switching component connects the second selection circuit and the jumper cap circuit, it is further configured to control the second selection circuit to connect multiple second channels respectively to receive the second recognition data output by the jumper cap circuit, and to determine the status information of the second selection circuit based on the second recognition data and the reference recognition data; and, When the status information is determined to include an abnormal status, the air conditioner is controlled to stop working and corresponding alarm information is output; The first selection circuit includes at least one first controlled terminal, a first communication terminal, and a plurality of second communication terminals; wherein, the plurality of first channels connect the first communication terminal and the plurality of second communication terminals in a one-to-one correspondence, and the first controlled terminal and the first communication terminal are respectively electrically connected to the main control chip; The main control chip is also used to periodically receive the first identification data of the jumper cap circuit at preset time intervals, and to output a preset number of channel selection signals to the first controlled terminal in each cycle. The first selection circuit is also used to control the first communication terminal to connect multiple second communication terminals respectively according to the channel selection signal of the preset number of times, so as to output the corresponding first identification data to the main control chip; The first identification data includes a first level group, and the reference identification data includes a second level group; The first selection circuit is also used to sequentially connect multiple levels output by the jumper cap circuit through multiple second communication terminals according to the channel selection signal of the preset number of times, and output the corresponding first level group through the first communication terminal; When the main control chip is in the recognition mode, it is also used to match the received first level group with the second level group and determine the status information based on the matching result.

2. The channel selection circuit as described in claim 1, characterized in that, When the main control chip is in the recognition mode, it is specifically used to match the received first level group with the second level group. If there is at least one level in the first level group that is different from the second level group, it is determined that the status information includes an abnormal status. as well as, If multiple levels in the first level group are the same as multiple levels in the second level group, then the status information is determined to include a normal state.

3. The channel selection circuit as described in claim 1, characterized in that, The main control chip also includes a detection mode; The main control chip is also used to store the first identification data output by the jumper cap circuit into the first selection circuit as reference identification data when the detection mode is in operation.

4. The channel selection circuit as described in claim 1, characterized in that, The first selection circuit includes: The channel selection chip includes a first communication pin, multiple second communication pins, multiple controlled pins, a power supply pin, and a ground pin. The ground pin is grounded, the power supply pin is used to connect to a first power supply, the multiple second communication pins are connected one-to-one to multiple terminals of the jumper cap circuit, and are electrically connected one-to-one to multiple second channels of the second selection circuit via the switch assembly. The first resistor is connected in series between the main control chip and the first communication pin; The second resistor has a first end connected to the first power supply and a second end connected to the first communication pin. The first capacitor is connected in series between the first terminal of the first resistor and ground.

5. The channel selection circuit as described in claim 1, characterized in that, The switching assembly includes: The relay includes a coil and multiple contacts, which are connected in series one-to-one between multiple second channels and multiple terminals of the jumper cap circuit. The first end of the coil is used to connect to a second power supply, and the second end of the coil is electrically connected to the main control chip.

6. A channel selection method, applied to an air conditioner, characterized in that, Using the channel selection circuit as described in claim 1, based on the included first selection circuit, second selection circuit, switch assembly, and jumper cap circuit, the method includes: The first selection circuit is controlled to turn on multiple first channels respectively, so as to access the first identification data output by the jumper cap circuit; When in recognition mode, the state information of the first selection circuit is determined based on the first recognition data and the preset reference recognition data; When the status information includes an abnormal status, the switch assembly is turned on to connect the second selection circuit and the jumper cap circuit.

7. An air conditioner, characterized in that, It includes the channel selection circuit and jumper cap circuit as described in any one of claims 1-5, wherein the jumper cap circuit is electrically connected to the channel selection circuit.

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