CN112283875A - Air conditioner, communication circuit of air conditioner internal and external machines and fault detection method of communication circuit - Google Patents
Air conditioner, communication circuit of air conditioner internal and external machines and fault detection method of communication circuit Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 59
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- 101100294408 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) MOT2 gene Proteins 0.000 description 7
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
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Abstract
The invention discloses an air conditioner, an air conditioner indoor and outdoor unit communication circuit and a fault detection method thereof, wherein the air conditioner indoor and outdoor unit communication circuit comprises a first communication module, a second communication module, a detection module, a control module, a power supply module and a communication circuit; the power supply module comprises a first power supply and a second power supply which are connected in parallel, and the communication circuit comprises a first communication path and a second communication path which are connected in parallel; the detection module is used for detecting the loop current of the communication loop and outputting the loop current to the control module; the control module is used for controlling the first power supply to be disconnected and the second power supply to be connected when the communication loop fails and the loop current is determined to be smaller than the preset current; the control module is also used for controlling the first communication path to be disconnected and the second communication path to be connected when the loop current is determined to be smaller than the preset threshold value after the first power supply is disconnected and the second power supply is connected, so that the communication line can be automatically switched when the internal and external machine connecting line fails, and the maintenance cost is saved.
Description
Technical Field
The invention relates to the technical field of air conditioning equipment, in particular to an air conditioner, an air conditioner internal and external machine communication circuit and a fault detection method thereof.
Background
At present, the indoor and outdoor units of the household variable frequency air conditioner are communicated in a zero-live line communication mode, a zero-live line communication circuit is composed of common devices such as a resistor, a capacitor, a diode, a triode, an optocoupler and the like, an additional chip is not needed, and hardware is low in cost, so that the household variable frequency air conditioner is widely applied to the field of household variable frequency air conditioners.
As shown in fig. 1, the zero-live line communication is a current loop communication mode, and the on and off of the optical coupler in the circuit is determined by the loop current value. The current is greatly influenced by the resistance value in the communication loop, when the resistance value is increased, the loop current is reduced, so that the optical coupler cannot be conducted, the internal machine and the external machine cannot normally communicate, the communication fault is reported, and the normal use of a user is influenced; usually when the communication trouble of interior external machine appears, the maintenance personal can be through changing automatically controlled or outer automatically controlled problem of solving of interior external machine, often neglected the fact that interior external machine connecting wire might lead to interior external machine communication trouble equally, if interior external machine communication trouble leads to because of interior external machine connecting wire trouble this moment, the problem that interior external machine communication trouble influences air conditioner normal operating is not solved so through changing interior external machine automatically controlled or outer automatically controlled.
Thus, the prior art has yet to be improved and enhanced.
Disclosure of Invention
The invention provides an air conditioner, an air conditioner indoor and outdoor unit communication circuit and a fault detection method thereof, which can effectively solve the problem that the normal operation of the air conditioner is influenced by the indoor and outdoor unit communication fault caused by the fault of an indoor and outdoor unit connecting line.
In order to achieve the purpose, the invention adopts the following technical scheme:
a communication circuit of an indoor unit and an outdoor unit of an air conditioner comprises a first communication module, a second communication module, a detection module, a control module, a power supply module and a communication circuit; the first communication module is connected with the detection module, the detection module is connected with the second communication module through the communication line, and the second communication module is also connected with the first communication module through the power supply module to form a communication loop; the control module is respectively connected with the power supply module, the detection module, the first communication module, the communication line and the second communication module; the power supply module comprises a first power supply and a second power supply which are connected in parallel, and the communication circuit comprises a first communication path and a second communication path which are connected in parallel;
the detection module is used for detecting the loop current of the communication loop and outputting the loop current to the control module; the control module is used for controlling the first power supply to be switched off and the second power supply to be switched on when the communication loop fails and the loop current is determined to be smaller than the preset current; the control module is further configured to control the first communication path to be disconnected and the second communication path to be connected when it is determined that the loop current is smaller than a preset threshold value after the first power supply is disconnected and the second power supply is connected.
In the communication circuit of the indoor unit and the outdoor unit of the air conditioner, the control module comprises a control unit, a driving unit and a switch unit; the control unit is respectively connected with the driving unit and the switch unit, the driving unit is respectively connected with the first communication path and the second communication path, and the switch unit is respectively connected with the first power supply and the second power supply;
the control unit is used for outputting a first control signal to the switch unit when the communication loop fails and the loop current is determined to be smaller than a preset current; the switch unit controls the first power supply to be switched off and the second power supply to be switched on according to the first control signal; the control unit is further configured to output a second control signal to the driving unit when it is determined that the loop current is smaller than a preset threshold value after the first power supply is turned off and the second power supply is turned on; the driving unit drives the first communication path to be disconnected and the second communication path to be connected according to the second control signal.
In the communication circuit of the indoor unit and the outdoor unit of the air conditioner, the switch unit comprises a first switch tube, a second switch tube, a third switch tube and a fourth switch tube; the first end of the first switching tube, the first end of the second switching tube, the first end of the third switching tube and the first end of the fourth switching tube are connected with the control module; the second end of the first switch tube is connected with the detection module and the first communication module, the second end of the second switch tube is connected with the third end of the first switch tube, the second end of the third switch tube is connected with the third end of the first switch tube, and the second end of the fourth switch tube is connected with the second communication module, the negative electrode of the first power supply and the negative electrode of the second power supply; the third end of the second switch tube is connected with the anode of the second power supply, the third end of the third switch tube is connected with the anode of the first power supply, and the third end of the fourth switch tube is connected with the second communication module, the first communication path and the second communication path.
In the communication circuit of the indoor unit and the outdoor unit of the air conditioner, the driving unit comprises a first driving chip and a second driving chip, the first driving chip is respectively connected with the control module, the first communication path and the second communication path, and the second driving chip is respectively connected with the control module, the first communication path and the second communication path.
In the communication circuit of the indoor unit and the outdoor unit of the air conditioner, the first communication path comprises a first relay, a second relay and a first communication line; the 1 st foot of first relay is connected first driver chip, the 2 nd foot of first relay connects the electricity, the 3 rd foot of first relay passes through first communication line connects the 4 th foot of second relay, the 4 th foot of first relay is connected detection module, the 1 st foot of second relay is connected second driver chip, the 2 nd foot of second relay connects the electricity, the 3 rd foot of second relay is connected second communication module.
In the communication circuit of the indoor unit and the outdoor unit of the air conditioner, the second communication path comprises a third relay, a fourth relay and a second communication line; the 1 st pin of the third relay is connected with the first driving chip, the 2 nd pin of the third relay is connected with the power supply, the 4 th pin of the third relay is connected with the 3 rd pin of the fourth relay through the second communication line, the 1 st pin of the fourth relay is connected with the second driving chip, the 2 nd pin of the fourth relay is connected with the power supply, and the 4 th pin of the fourth relay is connected with the second communication module.
In the communication circuit of the indoor unit and the outdoor unit of the air conditioner, the detection module comprises a sampling resistor and an operational amplifier; one end of the sampling voltage is connected with a positive phase input end of the operational amplifier, a 4 th pin of the first relay and a 3 rd pin of the third relay, the other end of the sampling resistor is connected with an inverted phase input end of the operational amplifier and the operational amplifier, and an output end of the operational amplifier is connected with the control module.
In the communication circuit of the indoor unit and the outdoor unit of the air conditioner, the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are all triodes.
A fault detection method based on the communication circuit of the indoor unit and the outdoor unit of the air conditioner comprises the following steps:
the detection module detects the loop current of the communication loop and outputs the loop current to the control module;
the control module determines that the communication loop is in fault, and controls the first power supply to be disconnected and the second power supply to be connected when the loop current is determined to be smaller than the preset current;
the detection module detects the loop current of the communication loop again and outputs the loop current to the control module;
and when the control module determines that the loop current is smaller than the preset threshold value, the first communication path is controlled to be disconnected and the second communication path is controlled to be connected.
An air conditioner comprises the communication circuit of the indoor unit and the outdoor unit of the air conditioner.
Compared with the prior art, the invention provides an air conditioner, an air conditioner indoor and outdoor machine communication circuit and a fault detection method thereof, wherein the air conditioner indoor and outdoor machine communication circuit comprises a first communication module, a second communication module, a detection module, a control module, a power supply module and a communication line; the power supply module comprises a first power supply and a second power supply which are connected in parallel, and the communication circuit comprises a first communication path and a second communication path which are connected in parallel; the detection module is used for detecting the loop current of the communication loop and outputting the loop current to the control module; the control module is used for controlling the first power supply to be switched off and the second power supply to be switched on when the communication loop fails and the loop current is determined to be smaller than the preset current; the control module is further configured to control the first communication path to be disconnected and the second communication path to be connected when the loop current is determined to be smaller than a preset threshold value after the first power supply is disconnected and the second power supply is connected; the invention can effectively solve the problem that the communication fault of the internal machine and the external machine caused by the fault of the connecting line of the internal machine and the external machine affects the normal operation of the air conditioner, and avoids the electric control of the internal machine and the external machine from being replaced blindly by maintenance personnel, thereby reducing unnecessary maintenance and saving the maintenance cost.
Drawings
Fig. 1 is a schematic diagram of a communication circuit of an internal and external unit of an existing air conditioner;
fig. 2 is a block diagram of a communication circuit of an air conditioner indoor unit and an air conditioner outdoor unit according to the present invention;
fig. 3 is a schematic circuit diagram of a communication circuit of an air conditioner indoor unit and an air conditioner outdoor unit according to the present invention;
fig. 4 is a flowchart of a fault detection method for a communication circuit of an air conditioner indoor unit and an air conditioner outdoor unit according to the present invention.
Detailed Description
The invention aims to provide an air conditioner, an air conditioner indoor and outdoor unit communication circuit and a fault detection method thereof, which can effectively solve the problem that the normal operation of the air conditioner is influenced by the indoor and outdoor unit communication fault caused by the fault of an indoor and outdoor unit connecting line.
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 2, the communication circuit of the air conditioner indoor and outdoor unit according to the present invention includes a first communication module 100, a second communication module 200, a detection module 300, a control module 400, a power supply module 500, and a communication line 600, where the first communication module 100 is connected to the detection module 300, the detection module 300 is connected to the second communication module 200 through the communication line 600, and the second communication module 200 is further connected to the first communication module 100 through the power supply module 500 to form a communication loop, which is equivalent to the communication loop in this embodiment including the detection module 300, the communication line 600, the second communication module 200, the power supply module 500, and the first communication module 100; the control module 400 is respectively connected with the power supply module 500, the detection module 300, the first communication module 100, the communication line 600 and the second communication module 200; in this embodiment, the first communication module 100 is an external machine communication module, and the second communication module 200 is an internal machine communication module, at this time, the detection module 300 is disposed on an external machine side, but in other embodiments, the detection module 300 may also be disposed on an internal machine side, which is not limited in this disclosure.
In this embodiment, the second power source 520 is a standby power source, the second communication path 620 is a standby communication path, and the communication loop is powered by the first power source 510 by default during normal communication, and the first communication module 100 and the second communication module 200 are connected through the first communication path 610 to implement communication between the internal unit and the external unit.
In specific implementation, the detection module 300 is configured to detect a loop current of a communication loop, and output the loop current to the control module 400; the control module 400 is configured to control the first power supply 510 to be turned off and the second power supply 520 to be turned on when the communication loop fails and the loop current is determined to be smaller than the preset current; the control module 400 is further configured to control the first communication path 610 to be disconnected and the second communication path 620 to be connected when the loop current is determined to be smaller than the preset threshold after the first power supply 510 is disconnected and the second power supply 520 is connected, and the second communication path 620 is connected to the indoor and outdoor unit communication module, so that when the first communication path 610 fails, communication can be performed through a standby communication path, and further, normal operation of the air conditioner is prevented from being affected due to communication failure of the indoor and outdoor units of the air conditioner.
Specifically, when a communication fault occurs in the communication loop, the control module 400 first determines whether the loop current detected by the detection module 300 is smaller than a preset current, where the preset current in this embodiment is a minimum current when the communication loop normally works, and if the loop current is smaller than the preset current, the control module 400 controls the first power supply 510 to be turned off and starts the second power supply 520; at this time, the detection module 300 is still remained in the communication loop, the detection module 300 continues to detect the loop current at this time, and if the power supply U is unchanged, the loop current I is inversely proportional to the equivalent resistance in the loop according to the loop current I being equal to U/R; therefore, when the loop current is smaller than the preset threshold, the control module 400 may determine that the resistance value is increased due to an aging fault of the connection line between the internal and external devices when the communication loop fails, and then the control module 400 controls the first communication path 610 to be disconnected and starts the spare connection line between the internal and external devices, i.e., the second communication path 620, thereby implementing replacement of the communication line 600; in the process, the communication fault of the communication loop is quickly detected, the normal communication between the inner machine and the outer machine is ensured when the connecting line of the inner machine and the outer machine is in fault, the air conditioner operates normally, and the condition that maintenance personnel replace the inner machine and the outer machine electrically and blindly is avoided, so that unnecessary maintenance is reduced, and the maintenance cost is reduced.
Further, referring to fig. 3, the control module 400 includes a control unit 410, a driving unit 420, and a switch unit 430; the control unit 410 is respectively connected with the driving unit 420 and the switch unit 430, the driving unit 420 is respectively connected with the first communication path 610 and the second communication path 620, and the switch unit 430 is respectively connected with the first power supply U1 and the second power supply U2.
The control unit 410 is configured to output a first control signal to the switch unit 430 when the communication loop fails and the loop current is determined to be smaller than the preset current; the switch unit 430 controls the first power supply U1 to be switched off and the second power supply U2 to be switched on according to the first control signal; the control unit 410 is further configured to output a second control signal to the driving unit 420 when the loop current is determined to be smaller than the preset threshold after the first power source U1 is turned off and the second power source U2 is turned on; the driving unit 420 drives the first communication path 610 to be disconnected and the second communication path 620 to be connected according to the second control signal, thereby implementing effective control of the first power supply U1 and the second power supply U2 and the first communication path 610 and the second communication path 620.
When a communication fault occurs in the communication loop, the control unit 410 detects whether the loop circuit is smaller than a preset current through the detection module 300, if so, the control unit 410 outputs a first control signal to the switch unit 430, the switch unit 430 controls the first power supply U1 to be disconnected, the second power supply U2 is connected, then the loop current in the communication loop is detected again through the detection module 300, if the loop current is smaller than a preset threshold value, the control unit 410 outputs a second control signal to the driving unit 420, the driving unit 420 drives the first communication path 610 to be disconnected according to the second control signal, the standby communication path, namely the second communication path 620 is started to be connected to the circuit, and further effective control over the first power supply U1 and the second power supply U2 as well as the first communication path 610 and the second communication path is realized, thereby ensuring that when the connection line of the internal and external machines fails to cause the communication fault of the internal and external machines, the communication loop can automatically switch the power supply and the communication line 600 so that the air conditioner operates normally.
Further, the switching unit 430 includes a first switching tube Q1, a second switching tube Q2, a third switching tube Q3 and a fourth switching tube Q4; the first end of the first switching tube Q1, the first end of the second switching tube Q2, the first end of the third switching tube Q3 and the first end of the fourth switching tube Q4 are all connected with the control module 400; a second end of the first switching tube Q1 is connected to the detection module 300 and the first communication module 100, a second end of the second switching tube Q2 is connected to a third end of the first switching tube Q1, a second end of the third switching tube Q3 is connected to a third end of the first switching tube Q1, and a second end of the fourth switching tube Q4 is connected to the second communication module 200, a negative electrode of the first power supply U1 and a negative electrode of the second power supply U2; a third terminal of the second switching tube Q2 is connected to the positive electrode of the second power supply U2, a third terminal of the third switching tube Q3 is connected to the positive electrode of the first power supply U1, and a third terminal of the fourth switching tube Q4 is connected to the second communication module 200, the first communication path 610 and the second communication path 620.
When the communication loop normally works, the first switch tube Q1, the second switch tube Q2 and the fourth switch tube Q4 are all in an off state, the third switch tube Q3 is in an on state, and at the moment, the first power supply U1 and the first communication path 610 in the communication loop are connected into the circuit; when the communication loop fails, the control unit 410 detects that the loop current in the communication loop is smaller than the preset current through the detection module 300, and then controls the first switch tube Q1, the second switch tube Q2 and the fourth switch tube Q4 to be turned on, the third switch tube Q3 to be turned off, at this time, the second power supply U2 is connected to the circuit, the first switch tube Q1 short-circuits the first communication module 100, the fourth switch tube Q4 short-circuits the second communication module 200, and the communication loop only includes the second power supply U2, the first communication path 610 and the detection module 300; then, the detection module 300 detects the loop current in the communication loop again, when the loop current is smaller than the preset threshold, it is determined that the resistance value is increased due to the abnormal aging of the connection line between the internal and external devices, the control unit 410 controls the driving unit 420 to drive the first communication path 610 to be disconnected, and the second communication path 620 is connected to the access circuit, so that the communication line is replaced. The preset threshold is a loop current when only the detection module 300, the second power source U2 and the communication line 600 remain in the communication loop.
Further, please continue to refer to fig. 3, the driving unit 420 includes a first driving chip IC1 and a second driving chip IC2, the first driving chip IC1 is respectively connected to the control module 400, the first communication path 610 and the second communication path 620, the second driving chip IC2 is respectively connected to the control module 400, the first communication path 610 and the second communication path 620, in this embodiment, the first driving chip IC1 and the second driving chip IC2 are both large current driving chips that can be used for directly driving the relay, the types of the first driving chip IC1 and the second driving chip IC2 are ULN2003, of course, in other embodiments, driving chips with the same function may be selected, which is not limited in the present invention; the first driver chip IC1 is disposed on the outer side, and the first driver chip IC1 is disposed on the inner side.
Further, the first communication path 610 includes a first relay K1, a second relay K2, and a first communication line SIG 1; a pin 1 of the first relay K1 is connected with a first driving chip IC1, a pin 2 of the first relay K1 is connected with power, a pin 3 of the first relay K1 is connected with a pin 4 of the second relay K2 through a first communication line SIG1, a pin 4 of the first relay K1 is connected with the detection module 300, a pin 1 of the second relay K2 is connected with a second driving chip IC2, a pin 2 of the second relay K2 is connected with power, and a pin 3 of the second relay K2 is connected with the second communication module 200; specifically, when the communication loop performs normal communication, the control unit 410 controls the first driver chip IC1 to drive the first relay K1 to be turned on, the second driver chip IC2 to drive the second relay K2 to be turned on, and the corresponding first communication line SIG1 is connected to the circuit, so that normal communication is realized; when the first driver IC1 receives the second control signal, the first relay K1 and the second relay K2 are driven and controlled to be turned off, and the corresponding first communication line SIG1 is not connected to the circuit, so as to start the second communication path 620.
Further, the second communication path 620 includes a third relay K3, a fourth relay K4, and a second communication line SIG 2; a pin 1 of the third relay K3 is connected with the first driving chip IC1, a pin 2 of the third relay K3 is connected with electricity, a pin 4 of the third relay K3 is connected with a pin 3 of the fourth relay K4 through a second communication line SIG2, a pin 1 of the fourth relay K4 is connected with the second driving chip IC2, a pin 2 of the fourth relay K4 is connected with electricity, and a pin 4 of the fourth relay K4 is connected with the second communication module 200; when the communication loop normally communicates, the control unit 410 controls the first driving chip IC1 to drive the first relay K1 to be switched on and the third relay K3 to be switched off; the corresponding control unit 410 controls the second driving chip IC2 to drive the second relay K2 to be turned on and the fourth relay K4 to be turned off, which is equivalent to that the first communication line SIG1 is connected to the circuit at this time, and the second communication line SIG2 circuit 600 is not connected to the circuit; when the first driver chip IC1 receives the second control signal, the first relay K1 is driven to be disconnected, the third relay K3 is driven to be connected, so that the first communication line SIG1 is disconnected, at this time, when the second driver chip IC2 receives the second control signal, the second relay K2 is driven to be opened, the fourth relay K4 is driven to be connected, so that the second communication line SIG2 is connected into a circuit, effective switching between the first communication line SIG1 and the second communication line SIG2 is realized, and when the first communication line SIG1 is damaged, the communication can be automatically switched to the second communication line SIG2 for communication.
Further, the detection module 300 includes a sampling resistor RS1 and an operational amplifier OP 1; one end of the sampling voltage is connected with a non-inverting input end of an operational amplifier OP1, a 4 th pin of a first relay K1 and a 3 rd pin of a third relay K3, the other end of a sampling resistor RS1 is connected with an inverting input end of an operational amplifier OP1 and an operational amplifier OP1, an output end of the operational amplifier OP1 is connected with a unit, the sampling resistor RS1 converts loop current in a communication loop into a voltage signal and outputs the voltage signal to the operational amplifier OP1, the voltage signal is amplified by the operational amplifier OP1 and then output to the control unit 410, so that the control unit 410 can effectively detect whether a fault of an internal and external machine connecting line exists in the communication loop according to the magnitude of the voltage signal, and when the fault of the internal and external machine connecting line is detected, a switching standby communication line is started, maintenance personnel can be prevented from replacing the internal and external machine connecting lines blind.
Further, the control unit 410 comprises a first control chip MCU1 and a second control chip MCU2, the first control chip MCU1 is respectively connected to the first driving chip IC1, the first end of the first switch tube Q1, the first end of the second switch tube Q2, the first end of the third switch tube Q3 and the output end of the operational amplifier OP1, the second control chip MCU2 is respectively connected to the first ends of the second driving chip IC2 and the fourth switch tube Q4, the corresponding first control chip MCU1 is disposed on the external machine side for controlling the connection status of the first communication module 100, the connection status of the first power supply U1 and the second power supply U2, and the working status of the first driver chip IC1, respectively, the second control chip MCU2 is disposed on the internal machine side, the controller is used for respectively controlling the connection state of the second communication module 200 and the working state of the first driving chip IC1, and ensuring that the standby communication line can be automatically switched when the failure of the internal and external machine connecting line is determined; in this embodiment, the model of the first control chip is TMS320F28335, the second control chip may be RL78/G13, and in other embodiments, control chips having the same function may also be selected, which is not limited in the present invention.
Further, the present invention also provides a fault detection method based on the communication circuit between the indoor unit and the outdoor unit of the air conditioner, referring to fig. 4, the fault detection method of the communication circuit between the indoor unit and the outdoor unit of the air conditioner includes the following steps:
s100, a detection module detects loop current of a communication loop and outputs the loop current to a control module;
s200, the control module determines that the communication loop is in fault, and controls the first power supply to be disconnected and the second power supply to be connected when the loop current is determined to be smaller than the preset current;
s300, the control module determines that the communication loop is in fault, and controls the first power supply to be disconnected and the second power supply to be connected when the loop current is determined to be smaller than the preset current;
s400, when the control module determines that the loop current is smaller than the preset threshold value, the first communication path is controlled to be disconnected, and the second communication path is controlled to be connected.
The invention further provides an air conditioner which comprises the air conditioner internal and external machine communication circuit, the communication circuit of the air conditioner internal and external machines is arranged, whether the communication fault between the air conditioner internal and external machines is caused by the fault of the internal and external machine connecting line can be effectively detected, and after the communication fault of the internal and external machines caused by the fault of the internal and external machine connecting line is determined, the standby communication line can be automatically switched, so that the communication loop can still normally communicate, the normal operation of the air conditioner is ensured, meanwhile, the electric control of the internal and external machines is prevented from being blindly replaced by maintenance personnel, unnecessary maintenance is reduced, and the maintenance cost is saved; since the communication circuit of the indoor unit and the outdoor unit of the air conditioner is described in detail above, the detailed description is omitted here.
In summary, according to the air conditioner, the communication circuit of the air conditioner indoor unit and outdoor unit and the fault detection method thereof, the communication circuit of the air conditioner indoor unit and outdoor unit comprises a first communication module, a second communication module, a detection module, a control module, a power supply module and a communication line; the power supply module comprises a first power supply and a second power supply which are connected in parallel, and the communication circuit comprises a first communication path and a second communication path which are connected in parallel; the detection module is used for detecting the loop current of the communication loop and outputting the loop current to the control module; the control module is used for controlling the first power supply to be switched off and the second power supply to be switched on when the communication loop fails and the loop current is determined to be smaller than the preset current; the control module is further configured to control the first communication path to be disconnected and the second communication path to be connected when the loop current is determined to be smaller than a preset threshold value after the first power supply is disconnected and the second power supply is connected; the invention can effectively solve the problem that the communication fault of the internal machine and the external machine caused by the fault of the connecting line of the internal machine and the external machine affects the normal operation of the air conditioner, and avoids the electric control of the internal machine and the external machine from being replaced blindly by maintenance personnel, thereby reducing unnecessary maintenance and saving the maintenance cost.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (10)
1. A communication circuit of an indoor unit and an outdoor unit of an air conditioner is characterized by comprising a first communication module, a second communication module, a detection module, a control module, a power supply module and a communication circuit; the first communication module is connected with the detection module, the detection module is connected with the second communication module through the communication line, and the second communication module is also connected with the first communication module through the power supply module to form a communication loop; the control module is respectively connected with the power supply module, the detection module, the first communication module, the communication line and the second communication module; the power supply module comprises a first power supply and a second power supply which are connected in parallel, and the communication circuit comprises a first communication path and a second communication path which are connected in parallel;
the detection module is used for detecting the loop current of the communication loop and outputting the loop current to the control module; the control module is used for controlling the first power supply to be switched off and the second power supply to be switched on when the communication loop fails and the loop current is determined to be smaller than the preset current; the control module is further configured to control the first communication path to be disconnected and the second communication path to be connected when it is determined that the loop current is smaller than a preset threshold value after the first power supply is disconnected and the second power supply is connected.
2. The communication circuit of the indoor and outdoor units of the air conditioner as claimed in claim 1, wherein the control module comprises a control unit, a driving unit and a switch unit; the control unit is respectively connected with the driving unit and the switch unit, the driving unit is respectively connected with the first communication path and the second communication path, and the switch unit is respectively connected with the first power supply and the second power supply;
the control unit is used for outputting a first control signal to the switch unit when the communication loop fails and the loop current is determined to be smaller than a preset current; the switch unit controls the first power supply to be switched off and the second power supply to be switched on according to the first control signal; the control unit is further configured to output a second control signal to the driving unit when it is determined that the loop current is smaller than a preset threshold value after the first power supply is turned off and the second power supply is turned on; the driving unit drives the first communication path to be disconnected and the second communication path to be connected according to the second control signal.
3. An air conditioner indoor and outdoor unit communication circuit according to claim 2, wherein the switching unit includes a first switching tube, a second switching tube, a third switching tube and a fourth switching tube; the first end of the first switching tube, the first end of the second switching tube, the first end of the third switching tube and the first end of the fourth switching tube are connected with the control module; the second end of the first switch tube is connected with the detection module and the first communication module, the second end of the second switch tube is connected with the third end of the first switch tube, the second end of the third switch tube is connected with the third end of the first switch tube, and the second end of the fourth switch tube is connected with the second communication module, the negative electrode of the first power supply and the negative electrode of the second power supply; the third end of the second switch tube is connected with the anode of the second power supply, the third end of the third switch tube is connected with the anode of the first power supply, and the third end of the fourth switch tube is connected with the second communication module, the first communication path and the second communication path.
4. The air conditioner indoor and outdoor unit communication circuit as claimed in claim 2, wherein the driving unit includes a first driving chip and a second driving chip, the first driving chip is connected to the control module, the first communication path and the second communication path, respectively, and the second driving chip is connected to the control module, the first communication path and the second communication path, respectively.
5. An air conditioner outdoor and indoor unit communication circuit according to claim 4, wherein the first communication path includes a first relay, a second relay and a first communication line; the 1 st foot of first relay is connected first driver chip, the 2 nd foot of first relay connects the electricity, the 3 rd foot of first relay passes through first communication line connects the 4 th foot of second relay, the 4 th foot of first relay is connected detection module, the 1 st foot of second relay is connected second driver chip, the 2 nd foot of second relay connects the electricity, the 3 rd foot of second relay is connected second communication module.
6. An air conditioner indoor and outdoor unit communication circuit as claimed in claim 5, wherein the second communication path includes a third relay, a fourth relay and a second communication line; the 1 st pin of the third relay is connected with the first driving chip, the 2 nd pin of the third relay is connected with the power supply, the 4 th pin of the third relay is connected with the 3 rd pin of the fourth relay through the second communication line, the 1 st pin of the fourth relay is connected with the second driving chip, the 2 nd pin of the fourth relay is connected with the power supply, and the 4 th pin of the fourth relay is connected with the second communication module.
7. The communication circuit of the air conditioner indoor and outdoor unit as claimed in claim 6, wherein the detection module comprises a sampling resistor and an operational amplifier; one end of the sampling voltage is connected with a positive phase input end of the operational amplifier, a 4 th pin of the first relay and a 3 rd pin of the third relay, the other end of the sampling resistor is connected with an inverted phase input end of the operational amplifier and the operational amplifier, and an output end of the operational amplifier is connected with the control module.
8. An air conditioner indoor and outdoor unit communication circuit as claimed in claim 3, wherein the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are all triodes.
9. A method for detecting a fault of a communication circuit of an indoor unit and an outdoor unit of an air conditioner according to any one of claims 1 to 8, comprising the steps of:
the detection module detects the loop current of the communication loop and outputs the loop current to the control module;
the control module determines that the communication loop is in fault, and controls the first power supply to be disconnected and the second power supply to be connected when the loop current is determined to be smaller than the preset current;
the detection module detects the loop current of the communication loop again and outputs the loop current to the control module;
and when the control module determines that the loop current is smaller than the preset threshold value, the first communication path is controlled to be disconnected and the second communication path is controlled to be connected.
10. An air conditioner characterized by comprising the communication circuit of the indoor and outdoor units of the air conditioner as claimed in any one of claims 1 to 8.
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