CN115264752A - Error connection preventing circuit, air conditioner and control method of air conditioner - Google Patents

Abstract

The invention discloses an anti-misconnection circuit, an air conditioner and a control method thereof, belonging to the field of circuit wiring; an automatic switching circuit is connected between a first interface and a first relay circuit and a second interface and a second relay circuit; By switching the two working states of the circuit, the first interface can be connected to one of the first relay circuit and the second relay circuit, and the second interface can be connected to the other relay circuit at the same time; in this way, the two operations of the circuit can be automatically switched by switching. The exchange of wiring can be completed in the state, and there is no need to unplug and re-wire. 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 according to the current; if the connection is wrong, the controller switches the working state of the automatic switching circuit to make the connection correct. The solution of the present application can not only detect whether the wiring is wrong, but also can automatically switch to make the wiring correct when the wiring is wrong, so as to ensure the normal operation of the circuit.

Description

Anti-misconnection circuit, air conditioner and control method thereof

technical field

The invention relates to the field of circuit wiring, in particular to an anti-misconnection circuit, an air conditioner and a control method thereof.

Background technique

With the development of air conditioners and the improvement of market demand, the applicable occasions of commercial air conditioners are becoming wider and wider, and the penetration rate is getting higher and higher. The wiring of internal and external units is mostly connected by copper inserts or screwed. However, in the actual wiring process, there will be potential safety hazards of wrong wiring. If the loads on the two wrong wiring lines use relays of different specifications, the relays of different specifications corresponding to the load will be damaged after the wrong wiring is turned on, and the unit cannot normal work.

Contents of the invention

In order to overcome the deficiencies of the prior art, the present invention provides an anti-misconnection circuit, an air conditioner and its control method to solve the problem that if the loads on the two wrongly connected lines use relays of different specifications, the power failure after the wrongly connected The relays of different specifications that cause damage to the corresponding loads, and the problem that the unit cannot work normally.

The technical solution adopted by the present invention to solve its technical problems is:

In the first aspect, an anti-misconnection circuit is provided, including: a first interface and a second interface located at the same terminal; the first interface is connected to the first load through a first relay circuit; the second interface is connected to the first load through a second relay the circuit is connected to the second load;

It also includes: a controller, a sampling circuit and an automatic switching circuit; the controller is connected to the sampling circuit and the automatic switching circuit respectively;

The automatic switching circuit is respectively connected to the first relay circuit and the second relay circuit, and the automatic switching circuit is respectively connected to the first interface and the second interface; the automatic switching circuit includes two working states : during the first working state, the first relay circuit is connected to the first interface through the automatic switching circuit, and the second relay circuit is connected to the second interface through the automatic switching circuit; during the second working state , the first relay circuit is connected to the second interface through the automatic switching circuit, and the second relay circuit is connected to the first interface through the automatic switching circuit;

The sampling circuit is used to detect the current at the first interface or the second interface; the controller switches the working state of the automatic switching circuit according to the current detected by the sampling circuit.

Further, PTC resistors are respectively provided at the first interface and the second interface.

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 includes a current transformer, the primary coil of the current transformer is connected to the first interface or the second interface, and the secondary coil of the current transformer is connected to the controller.

Further, the automatic switching circuit includes: multiple relays;

The multiple relays include:

a coil portion connected to the controller;

A first static contact connected to the first relay circuit and a first movable contact and a second movable contact corresponding to the first static contact, the first movable contact is connected to the first interface connected, the second movable contact is connected to the second interface;

A second static contact connected to the second relay circuit, a third movable contact and a fourth movable contact corresponding to the second static contact, the third movable contact is connected to the second interface connected, the fourth movable contact is connected to 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 specifications of the first relay and the second relay are different.

The second aspect provides an air conditioner, including the anti-wrong connection circuit described in any one of the technical solutions provided by the first aspect.

In a third aspect, an air conditioner control method is provided, which is applied to the air conditioner described in the technical solution provided in the second aspect, and the method includes:

Obtaining the current at the first interface or the second interface through a sampling circuit;

The working state of the automatic switching circuit is controlled according to the current.

Further, it also includes: an air conditioner that requires 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;

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.

Further, it also includes: an air conditioner that does not require 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;

controlling the second relay corresponding to the compressor to close for a first preset duration, obtaining the current at the first interface or the second interface within the first preset duration, and judging whether the connection is wrong according to the current;

If there is no wrong connection, then directly close the first relay; if it is wrong, switch the working state of the automatic switching circuit, and disconnect the second relay, after disconnecting the second relay for a second preset time closing the first relay and the second relay.

Beneficial effect:

The technical solution of the present application provides an anti-misconnection circuit, an air conditioner and a control method thereof, in which an automatic switching circuit is connected between the first interface and the first relay circuit and the second interface and the second relay circuit; In this working state, the first interface can be connected to one relay circuit in the first relay circuit and the second relay circuit, and the second interface can be connected to another relay circuit at the same time; in this way, it can be completed by switching the two working states of the automatic switching circuit Exchange of wiring, no need to unplug and rewire. 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 according to the current; if the connection is wrong, the controller switches the working state of the automatic switching circuit to make the connection correct. The solution of this application can not only detect whether the wiring is wrong, but also automatically switch to make the wiring correct when the wiring is wrong, thereby ensuring the normal operation of the circuit.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present application. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural diagram of an anti-misconnection circuit provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of a specific anti-misconnection circuit structure provided by an embodiment of the present invention;

Fig. 3 is a flowchart of an air conditioner control method provided by an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present invention will be described in detail below in conjunction with the drawings and embodiments. Apparently, the described embodiments are only some of the embodiments of this application, not all of them. Based on the embodiments in the present application, all other implementation manners obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present application.

The first embodiment, with reference to Fig. 1, the embodiment of the present invention provides an anti-wrong connection circuit, comprising: a first interface 11 and a second interface 12 located at the same terminal; the first interface 11 is connected to the second interface through a first relay circuit 13 A load 14; the second interface 12 is connected to the second load 16 through the second relay circuit 15;

Also include: a controller 17, a sampling circuit 18 and an automatic switching circuit 19; the controller 17 is connected to the sampling circuit 18 and the automatic switching circuit 19 respectively;

Automatic switching circuit 19 connects first relay circuit 13 and second relay circuit 15 respectively, and automatic switching circuit 19 connects first interface 11 and second interface 12 respectively; Automatic switching circuit 19 comprises two kinds of work states: during the first work state, The first relay circuit 13 is connected to the first interface 11 by the automatic switching circuit 19, and the second relay circuit 15 is connected to the second interface 12 by the automatic switching circuit 19; Two interfaces 12, the second relay circuit 15 is connected to the first interface 11 through an automatic switching circuit 19;

The sampling circuit 18 is used to detect the current at the first interface 11 and/or the second interface 12 ; the controller 17 switches the working state of the automatic switching circuit 19 according to the current detected by the sampling circuit 18 .

An anti-misconnection circuit provided by an embodiment of the present invention is an automatic switching circuit connected between the first interface and the first relay circuit and the second interface and the second relay circuit; through the two working states of the automatic switching circuit, the The first interface is connected to one relay circuit in the first relay circuit and the second relay circuit, and the second interface is connected to another relay circuit at the same time; in this way, the exchange of wiring can be completed by switching the two working states of the automatic switching circuit without unplugging Rewire after going 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 according to the current; if the connection is wrong, the controller switches the working state of the automatic switching circuit to make the connection correct. The solution of this application can not only detect whether the wiring is wrong, but also automatically switch to make the wiring correct when the wiring is wrong, thereby ensuring the normal operation of the circuit.

The second embodiment, as a supplementary description to the first embodiment, the present invention provides a specific anti-misconnection circuit, as shown in Figure 2, the first PTC resistor PTC1 is provided at the first interface TCP_OFAN, and the second interface TCP_COMP There is a second PTC resistor PTC2, where the first load is a fan, and the second load is a compressor.

The sampling circuit includes a current transformer T1, the primary coil of the current transformer T1 is connected to the first interface TCP_OFAN or the second interface TCP_COMP, and the secondary coil of the current transformer T1 is connected to the controller. In the embodiment of the present invention, the controller is an MCU chip. As shown in FIG. 2 , the sampling circuit includes a supporting circuit in addition to the current transformer T1 to ensure the normal operation of the sampling circuit.

The automatic switching circuit includes: multi-channel relay K3;

Multi-channel relay K3 includes:

The coil part connected with the controller;

The first static contact 8 connected to the first relay circuit and the first movable contact 6 and the second movable contact 7 corresponding to the first static contact 8, the first movable contact 6 is connected to the first interface TCP_OFAN, The second movable contact 7 is connected to the second interface TCP_COMP;

The second static contact 3 connected to the second relay circuit and the third movable contact 5 and the fourth movable contact 4 corresponding to the second static contact 3, the third movable contact 5 is connected to the second interface TCP_COMP, The fourth movable contact 4 is connected to the first interface TCP_OFAN.

As shown in FIG. 2 , in the embodiment of the present invention, the sampling circuit is only arranged between the second interface TCP_COMP and the automatic switching circuit. It can be understood that the sampling circuit can also be only arranged between the first interface TCP_OFAN and the automatic switching circuit. Alternatively, an automatic sampling circuit is provided 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 Figure 2, the first relay circuit includes a first relay K1, and the second relay circuit includes a second relay K2; the specifications of the first relay K1 and the second relay K2 are different, and the specifications include but are not limited to: rated AC load, DC Load, coil voltage and other values.

It should be noted that in Figure 2, D1, D2, D3, and D8 are diodes; D4, D5, D6, and D7 are clamping diodes; Q1, Q2, and Q3 are NPN transistors; R1, R3, R5, and R9 are current limiting Resistors; R2, R4, R6, R10, R11, R7 are voltage dividing resistors; C1, C5, C2 are chip or monolithic capacitors, and C4 is an electrolytic capacitor; the use of various components is a common technical means in this field. Its function will not be described in detail here.

The specific working process of the circuit in Figure 2 is as follows:

1. When the connection is wrong, the second interface TCP_COMP that originally formed a loop with the current transformer T1 becomes the first interface TCP_OFAN; the load compressor connected to the terminal side is reversed with the fan, that is, the connection is reversed; at the same time, it is connected in series to the first The first PTC resistor PTC1 and the second PTC resistor PTC2 of the interface TCP_OFAN and the second interface TCP_COMP can prevent the relay from getting an electric shock and damaging the circuit due to a short circuit caused by wrong wiring;

2. After the reverse connection, the current flowing through the primary of the current transformer T1 changes, because the current required by the compressor and the fan is different. When the reverse connection is made, the current in the line is different from that of the positive connection. Resistor R7 forms a loop to sense the output AC current and generate AC voltage on R7, rectified by diodes D4, D5, D5, D7 and filtered by capacitors C1, C2, C4, C5 to generate voltage signal CURRENT, which is output by MCU chip I/O At the same time, the additional detection lamp and buzzer will work; the detection lamp and buzzer are components connected to the MCU chip, not in the anti-misconnection circuit.

3. The MCU chip recognizes the voltage signal CURRENT, judges that the current has changed (that is, judges that the load is connected incorrectly), and the program outputs a low-level signal MCU_JUDGE according to the actual set value, so that the NPN emitter of the transistor Q3 is cut off, and the relay K3 The coil is partially de-energized;

4. After the coil part of the relay K3 is powered off, the internal contacts are switched (that is, the internal contacts are shifted from the second movable contact 7 to the first movable contact 6, and from the fourth movable contact 4 to the third movable contact 5), The first relay K1 is connected to the second interface TCP_COMP, and the second relay K2 is connected to the first interface TCP_OFAN, so that it can still automatically switch to the normal path after the load is connected incorrectly, and the unit works normally;

5. If the external terminal is connected correctly and there is no reverse connection, the current flowing through the primary of the current transformer will not change, MCU_JUDGE will output high level by default, the self-switching circuit will not work, and the unit will maintain normal operation.

The specific anti-misconnection circuit provided by the embodiment of the present invention will not damage relays of different specifications even if the load is connected incorrectly, and can automatically switch to a circuit with correct wiring, and the unit can still operate normally.

In the third embodiment, the present invention provides an air conditioner, including the anti-misconnection circuit provided in the first embodiment or the second embodiment. Similar to commercial split-type air conditioners, the wiring of the internal and external units is mostly connected by copper inserts or screwed. And the compressor and fan share the live wire and the neutral wire. At present, the general anti-misconnection detection circuit is realized through the potential difference and the conduction detection circuit to make it work. This method is simple, but it is only suitable for the neutral wire When the ground potential difference is obvious, the scope of application is small and the limitations are obvious, and it only plays the role of detection, which can only reduce the probability of equipment damage and cannot effectively protect the circuit.

In the anti-misconnection circuit provided by the embodiment of the present invention, 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; through the two working states of the automatic switching circuit, the first The interface is connected to one of the first relay circuit and the second relay circuit, and at the same time, the second interface is connected to another relay circuit; in this way, the exchange of wiring can be completed by switching the two working states of the automatic switching circuit without pulling out Rewire. 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 according to the current; if the connection is wrong, the controller switches the working state of the automatic switching circuit to make the connection correct. The solution provided by the embodiment of the present invention can not only detect whether the wiring is wrong, but also automatically switch to make the wiring correct when the wiring is wrong, ensuring the normal operation of the circuit. It can not only effectively detect whether the wiring is wrong, but also automatically switch when the wiring is wrong. Ensure the normal operation of the air conditioner.

In the fourth embodiment, the embodiment of the present invention provides an air conditioner control method, which is applied to the air conditioner provided in the third embodiment. As shown in FIG. 3 , the control method includes the following steps:

S11: Obtain the current at the first interface or the second interface through the sampling circuit;

S12: Automatically switch the working state of the circuit according to the current control.

In the air conditioner control method provided by the embodiment of the present invention, after the wiring is completed, the current at the first interface or the second interface can be obtained first through the sampling circuit. When the wiring is correct, the current at the first interface or the second interface should be the same as The preset current is the same; when the wiring is wrong, the current at the first interface or the second interface is different from the preset current; therefore, it can be judged whether the wiring is correct according to the current; when it is correct, there is no need to change the working state of the automatic switching circuit; 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 to the correct load. The control method provided by the embodiment of the present invention can detect whether the wiring is wrong through the current obtained by the sampling circuit, and can also control the automatic switching circuit to change the working state when the wiring is wrong, so as to ensure that the first interface or the second interface is connected to the correct load. There is no need to re-wiring, and the wiring efficiency is improved under the condition of ensuring the operation of the circuit.

The specific control principle has been described in the second embodiment, but what the second embodiment provides is the detection and switching process, which is the situation that the compressor and the blower are turned on and off at the same time; It is the default to turn on the fan first, and then turn on the compressor), the program can be set to detect whether the unit is connected to the wrong line within a period of time after power-on, the method of judging and detecting is to convert the current of the current transformer to the chip for sampling The divided voltage signal, the MCU chip internally judges and compares the signal. After the judgment is completed, decide whether to carry out the corresponding control and turn on the relay of the corresponding load, that is, the detection step must be completed before the next operation can be performed, to avoid switching the relay due to reverse connection, and the relay that originally controlled the fan to be turned on first compressor, causing damage.

For the unit that does not require the load start sequence, the solution for judging the wrong wiring is as follows: the program sets the compressor to be turned on for a short time after power-on (that is, the second relay is turned on first, because if the wiring is correct, the compressor circuit passes through the first relay) The current of the second relay is greater than the current passing through the first relay in the fan circuit, so even if the wiring is wrong, the second relay will turn on the fan that was originally turned on by the first relay, and it will not cause damage to the circuit). The divided voltage signal sampled by the chip is used to judge whether the wiring is wrong, and the circuit switching will be executed if the wiring is wrong; after the switching is completed, the program will turn off the relay that controls the compressor, and stop for three minutes (the specific time is set according to the actual application of the program) and then turn off the circuit. Start up and run according to the default timing.

For air conditioners with a display panel, the program setting or circuit can realize that after the compressor is connected incorrectly, the unit can report a fault display, and the program can use the fault signal as a trigger to enter the self-switching condition.

It can be understood that, the same or similar parts in the above embodiments can be referred to each other, and the content that is not described in detail in some embodiments can be referred to the same or similar content in other embodiments.

It should be noted that in the description of the present application, terms such as "first" and "second" are used for description purposes only, and should not be understood as indicating or implying relative importance. In addition, in the description of the present application, unless otherwise specified, the meaning of "plurality" means at least two.

Any process or method descriptions in flowcharts or otherwise described herein may be understood to represent modules, segments or portions of code comprising one or more executable instructions for implementing specific logical functions or steps of the process , and the scope of preferred embodiments of the present application includes additional implementations in which functions may be performed out of the order shown or discussed, including in substantially simultaneous fashion or in reverse order depending on the functions involved, which shall It should be understood by those skilled in the art to which the embodiments of the present application belong.

It should be understood that each part of the present application may be realized by hardware, software, firmware or a combination thereof. In the embodiments described above, various steps or methods may be implemented by software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or combination of the following techniques known in the art: Discrete logic circuits, ASICs with suitable combinational logic gates, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

Those of ordinary skill in the art can understand that all or part of the steps carried by the methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. During execution, one or a combination of the steps of the method embodiments is included.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing module, each unit may exist separately physically, or two or more units may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software function modules. If the integrated modules are realized in the form of software function modules and sold or used as independent products, they can also be stored in a computer-readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, and the like.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations on the present application, and those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

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.

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