CN115264752A - Error connection preventing circuit, air conditioner and control method of air conditioner - Google Patents
Error connection preventing circuit, air conditioner and control method of air conditioner Download PDFInfo
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- CN115264752A CN115264752A CN202210878454.3A CN202210878454A CN115264752A CN 115264752 A CN115264752 A CN 115264752A CN 202210878454 A CN202210878454 A CN 202210878454A CN 115264752 A CN115264752 A CN 115264752A
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- 238000005070 sampling Methods 0.000 claims abstract description 33
- 230000002265 prevention Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 description 7
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- 230000008569 process Effects 0.000 description 4
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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
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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
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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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
- F24F11/88—Electrical aspects, e.g. circuits
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Abstract
The invention discloses a wrong connection preventing circuit, an air conditioner and a control method of the air conditioner, and belongs to the field of circuit wiring; an automatic switching circuit is connected between the first interface and the first relay circuit and between the second interface and the second relay circuit; the first interface can be connected with one relay circuit in the first relay circuit and the second relay circuit through automatically switching two working states of the circuit, and the second interface is connected with the other relay circuit; therefore, the exchange of the wiring can be completed by switching the two working states of the automatic switching circuit without rewiring after being pulled out. In addition, the current of the first interface and/or the second interface can be obtained through the sampling circuit, and the controller judges whether the connection is wrong or not according to the current; if the connection is wrong, the controller switches the working state of the automatic switching circuit to ensure that the connection is correct. According to the scheme, whether wiring is wrong or not can be detected, wiring can be enabled to be correct through automatic switching when the wiring is wrong, and normal operation of a circuit is guaranteed.
Description
Technical Field
The invention relates to the field of circuit wiring, in particular to a wrong connection preventing circuit, an air conditioner and a control method of the wrong connection preventing circuit and the air conditioner.
Background
With the development of air conditioners and the improvement of market demands, the applicable occasions of commercial air conditioners are wider and wider, and the popularization rate is higher and higher. The wiring of the internal and external units is mostly in a mode of copper insert butt joint or screw connection. However, in the actual wiring process, the potential safety hazard of wrong wiring connection exists, if the relays with different specifications are used for the loads on the two lines of the wrong wiring connection, the relays with different specifications of corresponding loads can be damaged due to the fact that the relays with different specifications are electrified after the wrong wiring connection, and the unit cannot work normally.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a wrong connection preventing circuit, an air conditioner and a control method thereof, and aims to solve the problems that if relays with different specifications are respectively used for loads on two lines of a wrong connection line, the relays with different specifications of corresponding loads are damaged due to the fact that power is supplied after the wrong connection line is connected, and a unit cannot work normally.
The technical scheme adopted by the invention for solving the technical problems is as follows:
in a first aspect, a misconnection prevention circuit is provided, including: the first interface and the second interface are positioned at the same terminal; the first interface is connected with a first load through a first relay circuit; the second interface is connected with a second load through a second relay circuit;
further comprising: the device comprises a controller, a sampling circuit and an automatic switching circuit; the controller is respectively connected with the sampling circuit and the automatic switching circuit;
the automatic switching circuit is respectively connected with the first relay circuit and the second relay circuit, and the automatic switching circuit is respectively connected with the first interface and the second interface; the automatic switching circuit comprises two working states: in a first working state, the first relay circuit is connected with the first interface through the automatic switching circuit, and the second relay circuit is connected with the second interface through the automatic switching circuit; in a second working state, the first relay circuit is connected with the second interface through the automatic switching circuit, and the second relay circuit is connected with the first interface through the automatic switching circuit;
the sampling circuit is used for detecting the current at the first interface or the second interface; and the controller switches the working state of the automatic switching circuit according to the current detected by the sampling circuit.
Further, the first interface and the second interface are respectively provided with a PTC resistor.
Further, the sampling circuit is arranged between the first interface and the automatic switching circuit; or, the sampling circuit is arranged between the second interface and the automatic switching circuit.
Further, the sampling circuit comprises a current transformer, a primary coil of the current transformer is connected with the first interface or the second interface, and a secondary coil of the current transformer is connected with the controller.
Further, the automatic switching circuit includes: a multi-path relay;
the multi-way relay includes:
a coil part connected with the controller;
the first movable contact is connected with the first interface, and the second movable contact is connected with the second interface;
the third movable contact is connected with the second interface, and the fourth movable contact is connected with the first interface.
Further, the first load is a fan, and the second load is a compressor.
Further, the first relay circuit includes a first relay, and the second relay circuit includes a second relay; the first relay and the second relay have different specifications.
In a second aspect, an air conditioner is provided, which includes the error-connection-preventing circuit according to any one of the technical solutions provided in the first aspect.
In a third aspect, there is provided an air conditioner control method applied to the air conditioner in the technical solution provided in the second aspect, the method including:
acquiring current at the first interface or the second interface through a sampling circuit;
and controlling the working state of the automatic switching circuit according to the current.
Further, still include: for the air conditioner with the requirements on the starting sequence of the fan and the compressor, after the air conditioner is powered on, controlling a first relay and a second relay to be disconnected;
and after the working state of the automatic switching circuit is controlled according to the current, controlling the first relay and the second relay to be closed according to the opening sequence.
Further, the method also comprises the following steps: for an air conditioner with no requirement on the starting sequence of a fan and a compressor, after the air conditioner is powered on, controlling a first relay and a second relay to be disconnected;
controlling a second relay corresponding to the compressor to close for a first preset time period, acquiring current at the first interface or the second interface within the first preset time period, and judging whether the connection is wrong or not according to the current;
if the connection is not wrong, the first relay is directly closed; and if the connection is wrong, switching the working state of the automatic switching circuit, disconnecting the second relay, and closing the first relay and the second relay after disconnecting the second relay for a second preset time.
Has the advantages that:
the technical scheme of the application provides a wrong connection preventing circuit, an air conditioner and a control method of the air conditioner, wherein an automatic switching circuit is connected between a first interface and a first relay circuit and between a second interface and a second relay circuit; the first interface can be connected with one relay circuit in the first relay circuit and the second relay circuit through automatically switching two working states of the circuit, and the second interface is connected with the other relay circuit; therefore, the exchange of the wiring can be completed by switching the two working states of the automatic switching circuit without rewiring after being pulled out. In addition, the current of the first interface and/or the second interface can be obtained through the sampling circuit, and the controller judges whether the connection is wrong or not according to the current; if the connection is wrong, the controller switches the working state of the automatic switching circuit to ensure that the connection is correct. According to the scheme, whether wiring is wrong or not can be detected, and when the wiring is wrong, automatic switching can be performed to enable the wiring to be correct, so that the normal operation of a circuit is guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a fault-tolerant circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a specific configuration of a fault-tolerant circuit according to an embodiment of the present invention;
fig. 3 is a flowchart of an air conditioner control method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following detailed description of the technical solutions of the present invention is provided with reference to the accompanying drawings and examples. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
First embodiment, referring to fig. 1, an embodiment of the present invention provides an error-connection-preventing circuit, including: a first interface 11 and a second interface 12 located at the same terminal; the first interface 11 is connected to a first load 14 through a first relay circuit 13; the second interface 12 is connected to a second load 16 through a second relay circuit 15;
further comprising: a controller 17, a sampling circuit 18 and an automatic switching circuit 19; the controller 17 is respectively connected with the sampling circuit 18 and the automatic switching circuit 19;
the automatic switching circuit 19 is respectively connected with the first relay circuit 13 and the second relay circuit 15, and the automatic switching circuit 19 is respectively connected with the first interface 11 and the second interface 12; the automatic switching circuit 19 includes two operating states: in the first working state, the first relay circuit 13 is connected with the first interface 11 through the automatic switching circuit 19, and the second relay circuit 15 is connected with the second interface 12 through the automatic switching circuit 19; in the second working state, the first relay circuit 13 is connected with the second interface 12 through the automatic switching circuit 19, and the second relay circuit 15 is connected with the first interface 11 through the automatic switching circuit 19;
the sampling circuit 18 is used for detecting the current at the first interface 11 and/or the second interface 12; the controller 17 switches the operating state of the automatic switching circuit 19 in accordance with the current detected by the sampling circuit 18.
According to the wrong connection preventing circuit provided by the embodiment of the invention, the automatic switching circuit is connected between the first interface and the first relay circuit and between the second interface and the second relay circuit; by automatically switching two working states of the circuit, the first interface can be connected with one relay circuit in the first relay circuit and the second relay circuit, and the second interface is connected with the other relay circuit; therefore, the exchange of the wiring can be completed by switching the two working states of the automatic switching circuit without rewiring after being pulled out. In addition, the current of the first interface and/or the second interface can be obtained through the sampling circuit, and the controller judges whether the connection is wrong or not according to the current; if the connection is wrong, the controller switches the working state of the automatic switching circuit to ensure that the connection is correct. According to the scheme, whether wiring is wrong or not can be detected, and when the wiring is wrong, automatic switching can be performed to enable the wiring to be correct, so that the normal operation of a circuit is guaranteed.
A second embodiment, as a supplementary description to the first embodiment, the present invention provides a specific false connection preventing circuit, as shown in fig. 2, a first PTC resistor PTC1 is disposed at a first interface TCP _ OFAN, and a second PTC resistor PTC2 is disposed at a second interface TCP _ COMP, where the first load is a fan and the second load is a compressor.
The sampling circuit comprises a current transformer T1, a primary coil of the current transformer T1 is connected with a first interface TCP _ OFAN or a second interface TCP _ COMP, and a secondary coil of the current transformer T1 is connected with the controller. In the embodiment of the present invention, the controller is an MCU chip, and as shown in fig. 2, the sampling circuit includes a circuit matched with the current transformer T1 to ensure the normal operation of the sampling circuit.
The automatic switching circuit includes: a multi-path relay K3;
the multiplex relay K3 includes:
a coil part connected with the controller;
the first movable contact 6 is connected with a first interface TCP _ OFAN, and the second movable contact 7 is connected with a second interface TCP _ COMP;
and the second fixed contact 3 is connected with the second relay circuit, and the third movable contact 5 and the fourth movable contact 4 correspond to the second fixed contact 3, the third movable contact 5 is connected with the second interface TCP _ COMP, and the fourth movable contact 4 is connected with the first interface TCP _ OFAN.
As shown in fig. 2, in the embodiment of the present invention, the sampling circuit is only disposed between the second interface TCP _ COMP and the automatic switching circuit. It is to be understood that the sampling circuit may also be provided only between the first interface TCP _ OFAN and the automatic switching circuit. Or an automatic sampling circuit is arranged between the second interface TCP _ COMP and the automatic switching circuit and between the first interface TCP _ OFAN and the automatic switching circuit.
As shown in fig. 2, the first relay circuit includes a first relay K1, and the second relay circuit includes a second relay K2; the first relay K1 and the second relay K2 have different specifications including, but not limited to: rated ac load, dc load, coil voltage, etc.
In fig. 2, D1, D2, D3, and D8 are diodes; d4, D5, D6 and D7 are clamping diodes; q1, Q2 and Q3 are NPN triodes; r1, R3, R5 and R9 are current limiting resistors; r2, R4, R6, R10, R11 and R7 are divider resistors; c1, C5 and C2 are sheet or monolithic capacitors, and C4 is an electrolytic capacitor; the use of components is a common technical approach in the field and the function thereof will not be described in detail.
The circuit of fig. 2 specifically works as follows:
1. when the connection is wrong, a second interface TCP _ COMP which originally forms a loop with the current transformer T1 becomes a first interface TCP _ OFAN; the load compressor connected to the terminal side is exchanged with the fan, namely, the connection is reversed; meanwhile, the first PTC resistor PTC1 and the second PTC resistor PTC2 which are connected in series to the first interface TCP _ OFAN and the second interface TCP _ COMP can prevent the relay from electric shock faults and damaging circuits due to the fact that a wrong connection wire is in a short-circuit state;
2. after reverse connection, the CURRENT flowing through the primary side of the CURRENT transformer T1 changes, because the CURRENT required by the compressor and the fan is different, when the reverse connection is carried out, the CURRENT in the circuit is different from that in the forward connection, the secondary side of the CURRENT transformer T1 and the resistor R7 form a loop to induct and output alternating CURRENT and generate alternating voltage on the R7, and the voltage signal RRCUNT is generated through rectification of the diodes D4, D5 and D7 and filtering of the capacitors C1, C2, C4 and C5 and is sampled by an I/O port AD of the MCU chip; meanwhile, the additionally arranged detection lamp and the buzzer work; the detection lamp and the buzzer are components connected with the MCU chip and are not in the wrong connection prevention circuit.
3. The MCU chip identifies the voltage signal CURRENT, JUDGEs that the CURRENT changes (namely JUDGEs that the load is connected in a wrong way), and outputs a low-level signal MCU _ JUDGE according to an actual set value by a program to cut off an NPN emitter of the triode Q3 and cut off a coil part of the relay K3;
4. after the coil part of the relay K3 is powered off, the internal contacts are switched (namely the inside is shifted to a first movable contact 6 by a second movable contact 7 and is shifted to a third movable contact 5 by a fourth movable contact 4), the first relay K1 is connected with a second interface TCP _ COMP, and the second relay K2 is connected with a first interface TCP _ OFAN, so that the normal passage can be automatically switched after the load is connected in a wrong way, and the unit works normally;
5. if the external terminal is correctly connected without reverse connection, the primary current flowing through the current transformer does not change, the MCU _ JUDGE outputs high level by default, the self-switching circuit does not work, and the unit maintains normal operation.
According to the specific wrong connection preventing circuit provided by the embodiment of the invention, even if the load is connected in a wrong way, relays with different specifications cannot be damaged, the circuit with correct wiring can be automatically switched, and the unit can still normally operate.
In a third embodiment, the present invention provides an air conditioner including the error connection preventing circuit provided in the first or second embodiment. Similar to commercial split air conditioners, the wiring of the internal and external units is mostly in a mode of copper insert butt joint or screw connection. And its compressor and fan share live wire and zero line, and present general mistake proofing detection circuitry that connects makes its work realize through the potential difference, switch on detection circuitry, and this kind of mode is simple, but only is applicable to like the obvious condition to the earth potential difference of zero live wire, and application scope is little, and the limitation is obvious, and only plays the effect that detects, can only reduce equipment damage probability, can't effective protection circuit.
According to the wrong connection preventing circuit provided by the embodiment of the invention, the automatic switching circuit is connected between the first interface and the first relay circuit and between the second interface and the second relay circuit; by automatically switching two working states of the circuit, the first interface can be connected with one relay circuit in the first relay circuit and the second relay circuit, and the second interface is connected with the other relay circuit; therefore, the exchange of the wiring can be completed by switching the two working states of the automatic switching circuit without rewiring after being pulled out. In addition, the current of the first interface or the second interface can be obtained through the sampling circuit, and the controller judges whether the connection is wrong or not according to the current; if the connection is wrong, the controller switches the working state of the automatic switching circuit to ensure that the connection is correct. The scheme provided by the embodiment of the invention can detect whether the wiring is wrong or not, can automatically switch to ensure that the wiring is correct when the wiring is wrong, ensures the normal operation of the circuit, can effectively detect whether the wiring is wrong or not, and can automatically switch when the wiring is wrong, thereby ensuring the normal operation of the air conditioner.
In a fourth embodiment, an embodiment of the present invention provides an air conditioner control method, which is applied to the air conditioner provided in the third embodiment, and as shown in fig. 3, the control method includes the following steps:
s11: acquiring current at the first interface or the second interface through a sampling circuit;
s12: and controlling the working state of the automatic switching circuit according to the current.
According to the air conditioner control method provided by the embodiment of the invention, after wiring is finished, the current at the first interface or the second interface can be obtained through the sampling circuit, and when the wiring is correct, the current at the first interface or the second interface is the same as the preset current; when the wiring is wrong, the current at the first interface or the second interface is different from the preset current; therefore, whether the wiring is correct or not can be judged according to the current; when the circuit is correct, the working state of the automatic switching circuit does not need to be changed; when the wiring is wrong, the working state of the automatic switching circuit is changed, so that the first interface or the second interface is connected with a correct load. The control method provided by the embodiment of the invention can detect whether the wiring is wrong or not through the current acquired by the sampling circuit, and can also control the automatic switching circuit to change the working state when the wiring is wrong, so that the first interface or the second interface is ensured to be connected with a correct load. The wiring is not required to be reconnected, and the wiring efficiency is improved under the condition that the circuit operation is ensured.
The specific control principle has been described in the second embodiment, but the second embodiment provides a detection and switching process, which is a case where the compressor is turned on and off simultaneously with the fan; for most of unit starting sequences (the fan is firstly started and then the compressor is started according to the program setting), the program can be set to detect and judge whether the unit is connected with a wrong line within a period of time after being electrified, the judgment and detection method is that a voltage division signal sampled by a chip is transmitted according to the current of a current transformer, and an MCU chip judges and compares the interior of the signal. Whether the corresponding control is executed to open the relay of the corresponding load is determined after the judgment is finished, namely, the detection step must be finished to carry out the next operation, and the problem that the compressor is firstly opened by the original relay for controlling the fan to be opened to cause damage because the relay is not switched due to reverse connection is avoided.
For the unit without the requirement on the load starting sequence, the scheme for judging the line connection fault is as follows: firstly, a program is set to electrify, a compressor is started in a short time (namely, a second relay is started firstly, under the condition that wiring is correct, the current passing through the second relay in a compressor circuit is larger than the current passing through a first relay in a fan circuit, so that wiring is wrong, the second relay starts the fan which is originally started by the first relay, the circuit cannot be damaged), whether the wiring is wrong is judged according to a voltage division signal which is converted by the current of a current transformer and is sampled by a chip, and circuit switching is executed if the wiring is wrong; and after the switching is finished, the program closes the relay for controlling the compressor, and the compressor is started to operate according to a default time sequence after the compressor is stopped for three minutes (the specific time length is set according to the practical program application condition).
For the air conditioner with a display panel, after the fault line connection of the compressor can be realized by program setting or a circuit, the unit can report the fault display condition, and the program can take the fault signal as a trigger to enter the self-switching condition.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps in the process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following technologies, which are well known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (11)
1. A misconnection prevention circuit comprising: the first interface and the second interface are positioned at the same terminal; the first interface is connected with a first load through a first relay circuit; the second interface is connected with a second load through a second relay circuit;
it is characterized by also comprising: the device comprises a controller, a sampling circuit and an automatic switching circuit; the controller is respectively connected with the sampling circuit and the automatic switching circuit;
the automatic switching circuit is respectively connected with the first relay circuit and the second relay circuit, and the automatic switching circuit is respectively connected with the first interface and the second interface; the automatic switching circuit comprises two working states: in a first working state, the first relay circuit is connected with the first interface through the automatic switching circuit, and the second relay circuit is connected with the second interface through the automatic switching circuit; in a second working state, the first relay circuit is connected with the second interface through the automatic switching circuit, and the second relay circuit is connected with the first interface through the automatic switching circuit;
the sampling circuit is used for detecting the current at the first interface and/or the second interface; and the controller switches the working state of the automatic switching circuit according to the current detected by the sampling circuit.
2. The misconnection prevention circuit of claim 1, wherein: and PTC resistors are respectively arranged at the first interface and the second interface.
3. The misconnection prevention circuit of claim 1, wherein: the sampling circuit is arranged between the first interface and the automatic switching circuit; or, the sampling circuit is arranged between the second interface and the automatic switching circuit.
4. The misconnection prevention circuit of claim 1, wherein: the sampling circuit comprises a current transformer, a primary coil of the current transformer is connected with the first interface or the second interface, and a secondary coil of the current transformer is connected with the controller.
5. The misconnection prevention circuit of claim 1, wherein: the automatic switching circuit includes: a multi-path relay;
the multi-way relay includes:
a coil part connected with the controller;
the first movable contact is connected with the first interface, and the second movable contact is connected with the second interface;
and the third movable contact is connected with the second interface, and the fourth movable contact is connected with the first interface.
6. The misconnection prevention circuit of claim 1, wherein: the first load is a fan, and the second load is a compressor.
7. The misconnection prevention circuit of claim 1, wherein: the first relay circuit comprises a first relay and the second relay circuit comprises a second relay; the first relay and the second relay have different specifications.
8. An air conditioner, characterized in that: comprising the fault-connect protection circuit of any one of claims 1-7.
9. An air conditioner control method applied to the air conditioner of claim 8, the method comprising:
acquiring current at the first interface or the second interface through a sampling circuit;
and controlling the working state of the automatic switching circuit according to the current.
10. The method of claim 9, further comprising: for the air conditioner with the requirements on the starting sequence of the fan and the compressor, after the air conditioner is powered on, the first relay and the second relay are controlled to be disconnected;
and after the working state of the automatic switching circuit is controlled according to the current, the first relay and the second relay are controlled to be closed according to the opening sequence.
11. The method of claim 9, further comprising: for an air conditioner with no requirement on the starting sequence of a fan and a compressor, after the air conditioner is powered on, controlling a first relay and a second relay to be disconnected;
controlling a second relay corresponding to the compressor to be closed for a first preset time period, acquiring the current of the first interface or the second interface within the first preset time period, and judging whether the connection is wrong or not according to the current;
if the connection is not wrong, the first relay is directly closed; and if the connection is wrong, switching the working state of the automatic switching circuit, disconnecting the second relay, and closing the first relay and the second relay after disconnecting the second relay for a second preset time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210878454.3A CN115264752A (en) | 2022-07-25 | 2022-07-25 | Error connection preventing circuit, air conditioner and control method of air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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