Channel selection circuit and method and air conditioner

Abstract

The invention discloses a channel selection circuit and method and an air conditioner, and the circuit comprises a first selection circuit which comprises a plurality of first channels used for being connected with a jumper cap circuit; the second selection circuit comprises a plurality of second channels; a switch assembly; the main control chip is electrically connected with the first selection circuit, the second selection circuit and the switch assembly, the main control chip comprises an identification mode and is used for controlling the first selection circuit to connect the multiple first channels so as to access first identification data output by the jumper cap circuit, and when the main control chip is in the identification mode, the main control chip is switched on; 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 main control chip is further used for controlling the switch assembly to be switched on, and the second selection circuit and the jumper cap circuit are switched on. The technical scheme of the invention aims to reduce the condition of unit function failure caused by the abnormal identified jumper cap circuit number.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to a channel selection circuit, method and air conditioner. Background Art

[0002] At present, with the development of air-conditioning technology, load demand continues to increase, and the number of IO 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 IO ports and connect corresponding multiple jumper cap circuits respectively, wherein the identification number of the jumper cap circuit is closely related to the type of air conditioner.

[0003] However, in actual use and experimental tests, it was found that since there were no protective components at the jumper cap circuit interface circuit, the channel selection chip used for the jumper cap circuit was often damaged due to static electricity problems, resulting in abnormal jumper cap circuit numbers recognized by the main control chip, causing malfunctions and affecting the normal use of the unit. Summary of the invention

[0004] The main purpose of the present invention is to provide a channel selection circuit, method and air conditioner, aiming to reduce the situation where the unit function failure is caused by the abnormality of the identified jumper cap circuit number.

[0005] To achieve the above object, the channel selection circuit proposed in the present invention is applied to an air conditioner, and the air conditioner includes a corresponding jumper cap circuit, including:

[0006] A first selection circuit, comprising a plurality of first channels for accessing the jumper cap circuit;

[0007] A second selection circuit including a plurality of second channels;

[0008] A switch component, connected in series between the plurality of the second channels and the jumper cap circuit;

[0009] a main control chip, electrically connected to the first selection circuit, the second selection circuit and the switch component, respectively; the main control chip includes an identification mode, used to control the first selection circuit to connect the plurality of first channels respectively, so as to access the first identification data output by the jumper cap circuit, and when in the identification mode, to judge the state information of the first selection circuit according to the first identification data and preset reference identification data;

[0010] When it is determined that the state information includes an abnormal state, the main control chip is further used to control the switch component to be turned on, so as to connect 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 to 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 respectively;

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

[0013] The first selection circuit is further used to control the first communication terminal to connect the plurality of second communication terminals respectively according to the preset number of channel selection signals, so as to output 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 further used to sequentially access the multiple levels output by the jumper cap circuit through the multiple second communication terminals according to the channel selection signal of the preset number of times, and output them as the corresponding first level group through the first communication terminal;

[0016] When the main control chip is in the identification mode, the main control chip is further used to match the received first level group with the second level group, and determine the state information according to the matching result.

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

[0018] If the multiple levels of the first level group are the same as the multiple levels of the second level group, it is determined that the state information includes a normal state.

[0019] In some embodiments, when the main control chip is in the identification mode and the switch component connects the second selection circuit to the jumper cap circuit, the main control chip is further used 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 state information of the second selection circuit according to the second identification data and the reference identification data; and

[0020] When it is determined that the state information includes 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 connect the first selection circuit to the first identification data output by the jumper cap circuit when in the detection mode, and store it as reference identification data.

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

[0024] A channel selection chip, comprising a first communication pin, a plurality of second communication pins, a plurality of controlled pins, a power pin and a ground pin, wherein the ground pin is grounded, the power pin is used to connect to a first power supply, and the plurality of second communication pins are connected to the plurality of connection terminals of the jumper cap circuit in a one-to-one correspondence, and are electrically connected to the plurality of second channels of the second selection circuit in a one-to-one correspondence through the switch assembly;

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

[0026] A second resistor, a first end of which is used to connect to the first power supply, and a second end of which is connected to the first communication pin;

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

[0028] In some embodiments, the switch assembly comprises:

[0029] The relay comprises a coil and a plurality of contacts, wherein the plurality of contacts are connected in series one by one between the plurality of second channels and the plurality of connection 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.

[0030] The present invention also provides a channel selection method, which is applied to an air conditioner, wherein the air conditioner comprises a first selection circuit, a second selection circuit, a switch component and a jumper cap circuit, and the method comprises:

[0031] Controlling the first selection circuit to connect the plurality of first channels respectively, so as to access the first identification data output by the jumper cap circuit;

[0032] When in the identification mode, determining the state information of the first selection circuit according to the first identification data and preset reference identification data;

[0033] When the state information includes an abnormal state, the switch component is controlled to be turned on to connect the second selection circuit with the jumper cap circuit.

[0034] The present invention further provides an air conditioner, comprising the above-mentioned channel selection circuit and a jumper cap circuit, wherein the jumper cap circuit is electrically connected to the channel selection circuit.

[0035] The technical solution of the present invention sets reference identification data in the main control chip, and controls the first selection circuit to control multiple first channels to be turned on respectively, and turns on the first identification data, so that the control chip can verify the identification information of the connected jumper cap circuit, and judge the state of the channel selection chip, so as to avoid the chip being unable to normally control each module of the unit through the jumper cap circuit due to abnormal state, and by setting the second selection circuit, it works when the state information of the first selection circuit includes an abnormal state, 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 jumper cap circuit numbers are identified. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

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

[0038] Figure 2 A schematic diagram of a flow chart of an embodiment of a channel selection circuit of the present invention;

[0039] Figure 3 A schematic diagram of a flow chart of another embodiment of a channel selection circuit of the present invention;

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

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

[0042] Description of Figure Numbers:

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

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

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0047] The present invention provides a channel selection circuit.

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

[0049] A first selection circuit 110, comprising a plurality of first channels for accessing the jumper cap circuit;

[0050] The second selection circuit 120 includes a plurality of second channels;

[0051] A switch component 130, connected in series between a plurality of the 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 component 130 respectively. The main control chip 140 includes an identification mode for controlling the first selection circuit 110 to connect the plurality of first channels respectively to access the first identification data output by the jumper cap circuit, and when in the identification mode, judging the state information of the first selection circuit 110 according to the first identification data and the preset reference identification data;

[0053] When it is determined that the state information includes an abnormal state, the main control chip 140 is further used to control the switch component 130 to be turned on, so as to connect the second selection circuit 120 with 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, and on the side electrically connected to the jumper cap circuit, they are electrically connected to multiple connection terminals of the jumper cap circuit through multiple communication ports.

[0055] It is understandable that after the main control board is produced, it can usually be matched with different models of equipment, but the working parameters (such as power and working current) of different models of equipment are also different. Therefore, it is necessary to identify the corresponding model of equipment for appropriate control. Each model of equipment is respectively provided with a corresponding plurality of jumper cap circuits, and the numbers of the plurality of jumper cap circuits are fixedly corresponding to a model of equipment. Therefore, by identifying the number of the jumper cap circuit, the model of the equipment can be determined. Similarly, under the premise of knowing the model of the equipment, the jumper cap circuit number of the equipment model is pre-stored (i.e., the pre-stored reference identification data), and it can be detected by detecting the number returned by the jumper cap circuit (i.e., the first identification data in this application) to detect whether it is working normally.

[0056] Specifically, when the main control board is installed in an air conditioner to control the operation of the air conditioner, the main control chip 140 set in the main control board will pre-store the reference identification data of the jumper cap circuit in the air conditioner, and the reference identification data can be a serial number, a model or a special identifier, etc. When the air conditioner is working, the main control chip 140 needs to identify the jumper cap circuit of the air conditioner to determine the model of the air conditioner. At this time, the main control chip 140 controls the 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 a wiring port of the jumper cap circuit, and the data output by the port is received. After the multiple wiring ports are connected respectively, the received multiple data are collectively used as the first identification data of the jumper cap circuit.

[0057] Thus, 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, and when the status information of the jumper cap circuit includes an abnormal state, the second selection circuit 120 is controlled to operate so as to receive the data of the jumper cap circuit through the second selection circuit 120, thereby avoiding the situation where the selection circuit is damaged due to static electricity, resulting in an abnormal jumper cap circuit number identified by the main control chip 140, causing a malfunction and affecting the normal use of the unit.

[0058] The technical solution of the present invention sets reference identification data in the main control chip 140, and controls the first selection circuit 110 to control multiple first channels to be turned on respectively, and turns on the first identification data, so that the control chip can verify the identification information of the connected jumper cap circuit, and judge the state of the channel selection chip IC1, so as to avoid the chip being unable to control each module of the unit through the jumper cap circuit normally due to abnormal state, and by setting the second selection circuit 120, it works when the state information of the first selection circuit 110 includes an abnormal state, 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 jumper cap circuit numbers are identified.

[0059] Alternatively, if Figure 4 As shown, the switch assembly 130 includes:

[0060] Relay RY1 includes a coil and multiple contacts. The multiple contacts are connected in series one by one between multiple second channels and multiple connection 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 to 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 intervals of a preset period, and output a preset number of channel selection signals to the first controlled terminal in each period;

[0063] The first selection circuit 110 is further configured to control the first communication terminal to connect the plurality of second communication terminals respectively according to the preset number of channel selection signals, so as to output corresponding first identification data to the main control chip 140 .

[0064] In this embodiment, the number of the controlled terminals is determined by the number of the second communication terminals connected to the jumper cap circuit, and the controlled terminals are used to output signals representing specific second communication terminals, for example, using binary signals to determine which second communication terminals are turned on. If the main control chip 140 is in the 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 the identification mode, after judging the state information according to the first identification data within a cycle, the preset time period is delayed to re-receive the first identification data of the jumper cap circuit. When receiving, the main control chip 140 outputs a preset number of channel selection signals according to the number of wiring terminals electrically connected to the jumper cap circuit, so as to connect with each wiring terminal of the jumper cap circuit. Therefore, the preset number is the same as the number of wiring terminals electrically connected to the jumper cap circuit.

[0066] Therefore, after the connection terminals of the jumper cap circuit are connected one by one, 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 comprises a first level group, and the reference identification data comprises a second level group;

[0068] The first selection circuit 110 is further used to sequentially access the multiple levels output by the jumper cap circuit through the multiple second communication terminals according to the preset number of channel selection signals, and output them as corresponding first level groups through the first communication terminals;

[0069] When the main control chip 140 is in the identification mode, it is further configured to match the received first level group with the second level group, and determine the state information according to the matching result.

[0070] In the embodiment of the present invention, the first level group is a set of specific level sequences. Figure 4 For example, when multiple channels of the first selection circuit 110 are connected respectively, that is, X is connected to X0~X4 in sequence, the obtained level sequence is 01001, and the level sequence is the first level group, so the first level group is 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 specifically used to match the received first level group with the second level group, and if there is only at least one level in the first level group that is different from the second level group, determine that the state information includes an abnormal state; and,

[0072] If the multiple levels of the first level group are the same as the multiple levels of the second level group, it is determined that the state information includes a normal state.

[0073] In this embodiment, taking the second level group as 01001 as an example, if the first level group is 01001, that is, multiple levels in the first level group are equal to the second level group, then it is determined that the state information includes a normal state, and the main control chip 140 can determine that the first selection circuit 110 can normally connect the corresponding first channel. If the first level group is a level sequence of 01000, 10110, 01110, etc., then there is at least one level in the first level group that is not equal to the second level group, then it is determined that the state information includes 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 used to control the second selection circuit 120 to connect multiple second channels respectively after the control switch component 130 connects the second selection circuit 120 and the jumper cap circuit, so as to access the second identification data output by the jumper cap circuit, and determine the state information of the second selection circuit 120 according to the second identification data and the reference identification data; and

[0075] When it is determined that the state information includes 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 includes an abnormal state, that is, the first selection circuit 110 fails, the control switch component 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 in the identification mode and periodically controls the reception of the second identification data of the second switch circuit.

[0077] If the state information includes an abnormal state according to the second identification data and the reference identification data, it means that the second selection circuit 120 is also unable to normally connect the corresponding second channel, and the main control chip 140 is unable to output different data to the corresponding module through the corresponding channel. In order to avoid affecting the normal use 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 uses the interactive components of the air conditioner (such as a display screen, a wireless module, etc.) to output corresponding alarm information.

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

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

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

[0081] Specifically, after the main control board is connected to the air conditioner, the main control chip 140 is set to the 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 the multiple connection 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 comprises a first communication pin, a plurality of second communication pins, a plurality of controlled pins, a power pin and a ground pin, wherein the ground pin is grounded, the power pin is used to connect to a first power supply, and the plurality of second communication pins are connected to the plurality of connection terminals of the jumper cap circuit in a one-to-one correspondence, and are electrically connected to the plurality of second channels of the second selection circuit 120 in a one-to-one correspondence through the switch assembly 130;

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

[0085] A second resistor R2, a first end of which is used to connect to the first power supply, and a second end of which is connected to the first communication pin;

[0086] The first capacitor C1 is connected in series between the first end of the first resistor R1 and the 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, the second resistor R2 is a pull-up resistor, and the first capacitor C1 is a filter capacitor in the first selection circuit 110. The main control chip 140 turns on different second communication pins X0 to X7 by controlling multiple controlled pins (A, B, and C pins) of the channel selection chip IC1.

[0088] The main control chip 140 memorizes the correct reference identification data in advance.

[0089] At the beginning, the main control chip 140 uses the port jump1 to obtain the first identification data and controls the switch component 130 to be turned off. At this time, the channel selection chip IC1 is connected to the circuit, and the second selection circuit 120 is not connected to the circuit. After receiving the first identification data, the main control chip 140 determines whether the first identification data is the reference identification data memorized in advance. If so, it is considered that the channel selection chip IC1 is in a normal state, and the current control state is maintained. At intervals of a preset period, it is periodically determined whether the first identification data is correct.

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

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

[0092] S210, controlling the first selection circuit to connect the plurality of first channels respectively to access the first identification data output by the jumper cap circuit;

[0093] S220, determining state information of the first selection circuit according to the first identification data and preset reference identification data;

[0094] S230. When the state information includes an abnormal state, control the switch component to be turned on, so as to connect the second selection circuit to the jumper cap circuit.

[0095] In this embodiment, when the main control board is installed in an air conditioner to control the operation of the air conditioner, the main control chip set in the main control board will pre-store the reference identification data of the jumper cap circuit in the air conditioner. When the air conditioner is working, the main control chip needs to identify the jumper cap circuit of the air conditioner to determine the model of the air conditioner. At this time, the main control chip controls multiple channels of the first selection circuit to be turned on respectively. When each channel is turned on, the port of the main control chip is connected to a wiring port of the jumper cap circuit, and the data output by the port is received. After the multiple wiring ports are connected respectively, the received multiple data are collectively used as the first identification data of the jumper cap circuit.

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

[0097] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A channel selection circuit, applied to an air conditioner, the air conditioner comprising a corresponding jumper cap circuit, characterized in that: The channel selection circuit comprises: A first selection circuit, comprising a plurality of first channels for accessing the jumper cap circuit; A second selection circuit including a plurality of second channels; A switch component, connected in series between the plurality of the second channels and the jumper cap circuit; a main control chip, electrically connected to the first selection circuit, the second selection circuit and the switch component, respectively; the main control chip includes an identification mode, used to control the first selection circuit to connect the plurality of first channels respectively, so as to access the first identification data output by the jumper cap circuit, and when in the identification mode, to judge the 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 includes an abnormal state, the main control chip is further used to control the switch component to be turned on, so as to connect the second selection circuit with the jumper cap circuit.

2. The channel selection circuit according to claim 1, characterized in that: 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 to 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 respectively; The main control chip is also used to periodically receive the first identification data of the jumper cap circuit at intervals of a preset period, and output a preset number of channel selection signals to the first controlled terminal in each period; The first selection circuit is further used to control the first communication terminal to connect the plurality of second communication terminals respectively according to the preset number of channel selection signals, so as to output corresponding first identification data to the main control chip.

3. The channel selection circuit according to claim 2, characterized in that: The first identification data includes a first level group, and the reference identification data includes a second level group; The first selection circuit is further used to sequentially access the multiple levels output by the jumper cap circuit through the multiple second communication terminals according to the channel selection signal of the preset number of times, and output them as the corresponding first level group through the first communication terminal; When the main control chip is in the identification mode, the main control chip is further used to match the received first level group with the second level group, and determine the state information according to the matching result.

4. The channel selection circuit according to claim 3, characterized in that: When the main control chip is in the identification mode, the main control chip is specifically used to match the received first level group with the second level group, and if there is only at least one level in the first level group that is different from the second level group, determine that the state information includes an abnormal state; as well as, If the multiple levels of the first level group are the same as the multiple levels of the second level group, it is determined that the state information includes a normal state.

5. The channel selection circuit according to claim 1, characterized in that: When the main control chip is in the identification mode and the switch component connects the second selection circuit to the jumper cap circuit, the main control chip is further used 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 state information of the second selection circuit according to the second identification data and the reference identification data; and When it is determined that the state information includes an abnormal state, the air conditioner is controlled to stop working and corresponding alarm information is output.

6. The channel selection circuit according to claim 1, characterized in that: The main control chip also includes a detection mode; The main control chip is also used to connect the first selection circuit to the first identification data output by the jumper cap circuit when in the detection mode, and store it as reference identification data.

7. The channel selection circuit according to claim 1, characterized in that: The first selection circuit comprises: A channel selection chip, comprising a first communication pin, a plurality of second communication pins, a plurality of controlled pins, a power pin and a ground pin, wherein the ground pin is grounded, the power pin is used to connect to a first power supply, and the plurality of second communication pins are connected to the plurality of connection terminals of the jumper cap circuit in a one-to-one correspondence, and are electrically connected to the plurality of second channels of the second selection circuit in a one-to-one correspondence through the switch assembly; A first resistor is connected in series between the main control chip and the first communication pin; A second resistor, a first end of which is used to connect to the first power supply, and a second end of which is connected to the first communication pin; A first capacitor is connected in series between the first end of the first resistor and the ground.

8. The channel selection circuit according to claim 1, characterized in that: The switch assembly comprises: The relay comprises a coil and a plurality of contacts, wherein the plurality of contacts are connected in series one by one between the plurality of second channels and the plurality of connection 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.

9. A channel selection method, applied to an air conditioner, characterized in that: The air conditioner comprises a first selection circuit, a second selection circuit, a switch component and a jumper cap circuit, and the method comprises: Controlling the first selection circuit to connect the plurality of first channels respectively, so as to access the first identification data output by the jumper cap circuit; When in the identification mode, determining the state information of the first selection circuit according to the first identification data and preset reference identification data; When the state information includes an abnormal state, the switch component is controlled to be turned on to connect the second selection circuit with the jumper cap circuit.

10. An air conditioner, characterized in that: It comprises the channel selection circuit and jumper cap circuit as described in any one of claims 1 to 8, and the jumper cap circuit is electrically connected to the channel selection circuit.

Images