CN111486570A

CN111486570A - Control circuit, indoor unit, air conditioner and control method

Info

Publication number: CN111486570A
Application number: CN202010318539.7A
Authority: CN
Inventors: 牟宗娥; 陈建兵; 牛建勇; 王勇
Original assignee: Hisense Shandong Air Conditioning Co Ltd
Current assignee: Hisense Shandong Air Conditioning Co Ltd
Priority date: 2020-04-21
Filing date: 2020-04-21
Publication date: 2020-08-04

Abstract

The application provides a control circuit, an indoor unit, an air conditioner and a control method, and relates to the technical field of air conditioner control. The control circuit includes: the switching device, the zero-crossing detection sub-circuit, the first fan and the main control board can solve the problem that refrigerant cannot circulate in the compressor due to the failure of the switching device, so that the compressor is damaged. The first port of the main control board is connected with the first port of the switch device, the third port is connected with the first fan, and the fourth port is connected with the second fan. And a second port of the switching device is respectively connected with a first port of the zero-crossing detection sub-circuit and the compressor, and a second port of the zero-crossing detection sub-circuit is connected with a second port of the main control board. The master control board is configured to: and sending a first level signal for indicating the switching-off of the switching device to the switching device, and controlling the first fan and the second fan to start and operate if receiving a first feedback signal sent by the zero-crossing detection sub-circuit within a first preset time period.

Description

Control circuit, indoor unit, air conditioner and control method

Technical Field

The application relates to the technical field of air conditioner control, in particular to a control circuit, an indoor unit, an air conditioner and a control method.

Background

The constant speed air conditioner can adopt a relay switch to control the operation of the compressor. After the air conditioner starts to operate, the main control board controls the relay switch to be closed, so that the compressor starts to operate, and meanwhile, an indoor fan and an outdoor fan of the air conditioner are both started to operate. When the ambient temperature reaches the temperature set by the user, the main control board controls the relay switch to be switched off, so that the compressor stops running, and meanwhile, the indoor fan and the outdoor fan of the air conditioner also stop running.

Because the power of the compressor is large, at the moment that the compressor starts or stops running, the current of two contact ends of the relay switch is increased instantly, and the contact adhesion phenomenon may occur. Under the condition of the contact adhesion of the relay switch, after the ambient temperature reaches the temperature set by the user, the main control board controls the indoor fan and the outdoor fan to stop running, but the contact adhesion of the relay switch still enables the compressor to run. Therefore, the refrigerant in the compressor cannot circulate through the condenser of the fan, and the high pressure in the compressor cannot be unloaded, so that the compressor is damaged.

Disclosure of Invention

The application provides a control circuit, an indoor unit, an air conditioner and a control method, and solves the problems that a refrigerant in a compressor cannot circulate and high pressure in the compressor cannot be unloaded due to the fact that relay switch contacts are adhered, and the compressor is damaged.

In order to achieve the purpose, the technical scheme is as follows:

in a first aspect, the present application provides a control circuit, which may be applied to an indoor unit of an air conditioner, and the control circuit includes a switching device, a zero-crossing detection sub-circuit, a first fan, and a main control board. The first port of the main control board is connected with the first port of the switch device, the second port of the switch device is connected with the first port of the zero-crossing detection sub-circuit, the second port of the zero-crossing detection sub-circuit is connected with the second port of the main control board, and the third port of the main control board is connected with the first fan. In addition, a second port of the switching device is also connected with a compressor of the outdoor unit, and a fourth port of the main control board is connected with a second fan of the outdoor unit. The main control board can control the running state of the compressor through the switching device, and when the switching device is in a closed state, the compressor runs; when the switching device is in an off state, the compressor stops operating. The main control board may send a first level signal to the switching device to indicate that the switching device is turned off, and after the first level signal is sent to the switching device, if a first feedback signal sent by the zero-crossing detection sub-circuit to indicate that the switching device is in a closed state is received within a first preset time period, the main control board controls the first fan and the second fan to start operation.

In the control circuit provided by the application, after the main control board sends the first level signal (that is, a signal indicating that the compressor stops operating) for indicating the switching device to be turned off to the switching device, the main control board may receive the feedback signal corresponding to the first level signal through the zero-crossing detection sub-circuit. If the main control board receives a first feedback signal for indicating that the switching device is in a closed state, it can be determined that the switching device fails, and the compressor cannot be stopped according to the indication of the first level signal. At this time, in order to enable the refrigerant in the compressor to circulate through the condensers of the first fan and the second fan, the main control board may control the first fan and the second fan to start and operate.

The main control board can determine whether the switching device for controlling the running state of the compressor fails or not through the signal fed back by the zero-crossing detection sub-circuit, so that when the switching device fails and the compressor cannot stop running, the main control board can control the first fan and the second fan to start running. Therefore, the refrigerant in the compressor can circulate through the condensers of the first fan and the second fan, and the problem that the compressor is damaged due to the fact that the refrigerant in the compressor cannot circulate is solved.

In a second aspect, the present application provides an indoor unit comprising the control circuit as provided in the first aspect.

In a third aspect, the present application provides an air conditioner, comprising an outdoor unit and the indoor unit as provided in the second aspect, wherein the outdoor unit comprises a compressor and a second fan.

In a fourth aspect, the present application provides a control method, which can be applied to the indoor unit provided in the second aspect, and the control method includes: the main control board sends a first level signal to the switching device, and the first level signal is used for indicating the switching device to be disconnected. The switching device is used for controlling the running state of the compressor, and when the switching device is in the closed state, the compressor runs; when the switching device is in an off state, the compressor stops operating. And if the main control board receives a first feedback signal sent by the zero-crossing detection sub-circuit within a first preset time, controlling the first fan and the second fan to start running. The first feedback signal is used to indicate that the switching device is in a closed state.

In a fifth aspect, the present application provides a control device, including a processor, which is configured to be coupled with a memory, read and execute instructions in the memory, so as to implement the control method provided in the fourth aspect.

Optionally, the control device may further comprise a memory for storing program instructions and data for the control device. Further optionally, the control device may further comprise a transceiver for performing the steps of transceiving data, signaling or information, e.g. transmitting the first level signal, under the control of the processor of the control device.

Optionally, the control device may be a main control board in the control circuit provided in the first aspect, or may be a part of a device in the main control board, for example, a chip system in the main control board. The system-on-chip is adapted to support the control device to implement the functions referred to in the fourth aspect, e.g. to receive, transmit or process data and/or information referred to in the above-mentioned control method. The chip system includes a chip and may also include other discrete devices or circuit structures.

In a sixth aspect, the present application provides a computer-readable storage medium having instructions stored therein, which when executed by a computer, implement the control method as provided in the fourth aspect.

In a seventh aspect, the present application provides a computer program product comprising computer instructions which, when run on a computer, cause the computer to perform the control method according to the fourth aspect.

It should be noted that all or part of the computer instructions may be stored on the computer readable storage medium. The computer readable storage medium may be packaged with the processor of the control device or packaged separately from the processor of the control device, which is not limited in this application.

For the description of the second, third, fourth, fifth, sixth and seventh aspects in this application, reference may be made to the detailed description of the first aspect; in addition, for the beneficial effects described in the second aspect, the third aspect, the fourth aspect, the fifth aspect, the sixth aspect, and the seventh aspect, reference may be made to the beneficial effect analysis of the first aspect, and details are not repeated here.

In the present application, the names of the above-mentioned control means do not limit the devices or functional modules themselves, which may appear by other names in actual implementations. Insofar as the functions of the respective devices or functional blocks are similar to those of the present invention, they are within the scope of the claims of the present application and their equivalents.

These and other aspects of the present application will be more readily apparent from the following description.

Drawings

Fig. 1 is a schematic structural diagram of a control circuit according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of another control circuit provided in the embodiment of the present application;

fig. 3 is a schematic structural diagram of another control circuit provided in the embodiment of the present application;

fig. 4 is a schematic structural diagram of another control circuit provided in the embodiment of the present application;

fig. 5 is a waveform diagram of input and output of a zero-crossing detection sub-circuit provided in an embodiment of the present application;

fig. 6 is a schematic flowchart of a control method according to an embodiment of the present application;

fig. 7 is a schematic flowchart of another control method provided in the embodiment of the present application;

fig. 8 is a schematic flowchart of another control method provided in the embodiment of the present application;

fig. 9 is a schematic flowchart of another control method provided in the embodiment of the present application;

fig. 10 is a schematic flowchart of another control method provided in the embodiment of the present application;

fig. 11 is a schematic structural diagram of a control device according to an embodiment of the present application.

Detailed Description

A control circuit, an indoor unit, an air conditioner, and a control method according to embodiments of the present application are described in detail below with reference to the accompanying drawings.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone.

The terms "first" and "second" and the like in the description and drawings of the present application are used for distinguishing different objects or for distinguishing different processes for the same object, and are not used for describing a specific order of the objects.

Furthermore, the terms "including" and "having," and any variations thereof, as referred to in the description of the present application, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It should be noted that in the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as examples, illustrations or descriptions. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

In the description of the present application, the meaning of "a plurality" means two or more unless otherwise specified.

At present, for a single-phase electric constant-speed air conditioner, a single-board control scheme is generally adopted, that is, a main control board is arranged in an indoor unit, the main control board in the indoor unit is not arranged in the outdoor unit, and the main control board in the indoor unit can control the operation of a compressor in the outdoor unit, referring to fig. 1, a control circuit in the existing single-phase electric constant-speed air conditioner is provided.

After the air conditioner is started and operated, the main control board controls the relay switch K to be closed, the compressor is started and operated, and meanwhile, the indoor fan M1 and the outdoor fan M2 are both started and operated. When the ambient temperature reaches the temperature set by the user, the main control board controls the relay switch K to be switched off, so that the compressor stops running, and meanwhile, the indoor fan and the outdoor fan of the air conditioner also stop running.

However, because the power of the compressor is large, at the moment that the compressor starts or stops operating, the current at the two contact ends of the relay switch K is increased instantaneously, and a contact adhesion phenomenon may occur (that is, the relay switch K maintains a normally closed state, and the compressor cannot be normally controlled to stop operating). Under the condition, after the ambient temperature reaches the temperature set by the user, the main control board controls the indoor fan and the outdoor fan to stop running, but the contacts of the relay switch K are adhered, and the compressor still runs. Therefore, the refrigerant in the compressor cannot circulate through the condenser of the fan, and the compressor is damaged.

To solve the problems in the prior art, an embodiment of the present application provides a control circuit, which includes a switching device, a zero-crossing detection sub-circuit, a first fan and a main control board. The main control board can control the running state of the compressor through the switching device and can receive a first feedback signal sent by the zero-crossing detection sub-circuit, so that the first fan and the second fan can be controlled to start and run according to the first feedback signal, and a refrigerant in the compressor can circulate through condensers of the first fan and the second fan. Therefore, the control circuit can effectively prolong the service life of the compressor.

The control circuit provided by the embodiment of the application can be applied to an indoor unit of an air conditioner, and a main control panel of the control circuit can be connected with an outdoor fan (namely, a second fan in the embodiment of the application) and a compressor in an outdoor unit of the air conditioner.

Fig. 2 shows a schematic structural diagram of a control circuit provided in an embodiment of the present application. As shown in fig. 2, the control circuit includes: the device comprises a switching device, a zero-crossing detection sub-circuit, a first fan and a main control board. The first port (a) of the main control board is connected with the first port (b) of the switch device; the second port (c) of the switching device is respectively connected with the first port (d) of the zero-crossing detection sub-circuit and the compressor; a second port (e) of the zero-crossing detection sub-circuit is connected with a second port (f) of the main control board; a third port (g) of the main control board is connected with the first fan; and a fourth port (h) of the main control board is connected with the second fan.

Wherein, the switching device is used for controlling the running state of the compressor. When the switching device is in a closed state, the compressor operates; when the switching device is in an off state, the compressor stops operating.

Illustratively, the switching device may be a relay switch. Of course, in practical applications, the switching device may be other types of switching devices that can control the operation state of the compressor.

Additionally, the master control board is configured to: transmitting a first level signal to the switching device; and if the first feedback signal sent by the zero-crossing detection sub-circuit is received within a first preset time, controlling the first fan and the second fan to start running.

Wherein the first level signal is used for indicating that the switching device is turned off, namely for indicating that the compressor stops running. The first feedback signal is used to indicate that the switching device is in a closed state. Illustratively, the first feedback signal may be a high-low level signal.

In this embodiment, the first fan may be an indoor fan of an air conditioner, and the second fan may be an outdoor fan of the air conditioner.

Since the second port (c) of the switching device is connected with the first port (d) of the zero-crossing detection sub-circuit, the zero-crossing detection sub-circuit can detect the voltages of the port c and the port d and feed back the measured voltage to the main control board through the port e.

For example, when the switching device is closed, the voltage between the c port and the d port is a sine wave signal, and the output voltage of the sine wave signal after passing through the zero-crossing detection sub-circuit is a high-low level signal. And when the switching device is not in fault, the switching device is disconnected after receiving the first level signal, and the compressor is controlled to stop running. At this time, since the switching device is turned off, the voltages at the c port and the d port are 0, and the measured voltage fed back to the main control board by the zero-cross detection sub-circuit through the e port is the power supply voltage in the zero-cross detection sub-circuit, that is, a high level signal. When the switching device is in fault, the switching device is still in a closed state after receiving the first level signal, and the compressor is still in operation. At this time, the voltages of the port c and the port d are sine wave signals, and the measurement voltage fed back to the main control board by the zero-crossing detection sub-circuit through the port e is a high-low level signal. Therefore, the main control board can determine that the switching device is still in a closed state according to the high-low level signal fed back by the zero-crossing detection sub-circuit, and meanwhile, the compressor is not stopped, namely, the switching device is in failure, so that the operation of the compressor cannot be normally controlled.

In addition, when the switching device fails (the contact is stuck and cannot be disconnected), the first feedback signal can be a high-low level signal, and when the switching device does not fail (the contact is stuck and cannot be disconnected), the zero-crossing detection sub-circuit feeds back a high-level signal to the main control board. Therefore, the main control board cannot judge whether the first feedback signal is the first feedback signal only by judging the output voltage of the zero-crossing detection sub-circuit at a certain moment, but needs to judge whether the first feedback signal sent by the zero-crossing detection sub-circuit is received within a first preset time length. The first preset time period may be a time period determined in advance by human.

It should be noted that, in practical applications, the second port (f), the third port (g), and the fourth port (h) of the main control board may be the same port, that is, the main control board may send a shutdown signal or a start operation signal to the first fan, the second fan, and the compressor through the same port. Of course, the second port (f), the third port (g), and the fourth port (h) of the main control board may also be different ports, that is, the main control board may send a shutdown signal or a start operation signal to the first fan, the second fan, and the compressor through different ports.

At present, the operation modes of a first fan and a second fan of an air conditioner comprise a refrigeration mode and a heating mode, wherein the refrigeration mode is used for reducing the ambient temperature, and the heating mode is used for increasing the ambient temperature. Therefore, after the main control board receives the first feedback signal sent by the zero-crossing detection sub-circuit within the first preset time, the operation modes of the first fan and the second fan can be determined according to the ambient temperature.

Therefore, optionally, as shown in fig. 3, the control circuit provided by the present application may further include a temperature sensor. Wherein, the temperature sensor can be connected with the fifth port (i) of the main control board. And the master control board is further configured to: and if a first feedback signal sent by the zero-crossing detection sub-circuit is received within a first preset time, acquiring the detection temperature of the temperature sensor, and controlling the operation modes of the first fan and the second fan according to the detection temperature.

Optionally, the main control board body is configured to: when the detected temperature is lower than the preset temperature, controlling the first fan and the second fan to start a heating mode; and when the detected temperature is higher than the preset temperature, controlling the first fan and the second fan to start the refrigeration mode.

The preset temperature may be a temperature determined in advance by a person.

Optionally, the main control board is further configured to: transmitting a second level signal to the switching device; and if a second feedback signal sent by the zero-crossing detection sub-circuit is received within a second preset time, controlling the first fan and the second fan to stop running.

The second level signal is used for indicating that the switching device is closed, and the second feedback signal is used for indicating that the switching device is in an open state. Illustratively, the second feedback signal may be a high level signal.

The application provides a control circuit, not only can detect out the condition that the contact adhesion appears in switching element, can also detect out the switching element because the unable actuation's of trouble contact condition. For example, when the switching device is still closed, the voltage between the c port and the d port is a sine wave signal, and the output voltage of the sine wave signal after passing through the zero-crossing detection sub-circuit is a high-low level signal. And when the switching device is not in fault, the switching device is closed after receiving the second level signal, and the compressor is controlled to start to operate. At this time, the voltages of the port c and the port d are sine wave signals, and the measurement voltage fed back to the main control board by the zero-crossing detection sub-circuit through the port e is a high-low level signal. When the switching device is in fault, the switching device is still in a disconnected state after receiving the second level signal, and the compressor is not started to operate. At this time, since the switching device is turned off, the voltages at the c port and the d port are 0, and the measured voltage fed back to the main control board by the zero-cross detection sub-circuit through the e port is the power supply voltage in the zero-cross detection sub-circuit, that is, a high level signal. Therefore, the main control board can determine that the switching device is still in the off state according to the high level signal fed back by the zero-crossing detection sub-circuit, and meanwhile, the compressor is not started to operate, namely, the switching device has a fault.

In addition, when the switching device fails (the contact cannot be attracted), the second feedback signal can be a high level signal, and when the switching device fails (the contact cannot be attracted), the zero-crossing detection sub-circuit feeds back a high level signal and a low level signal to the main control board. Therefore, the main control board cannot judge whether the second feedback signal is the second feedback signal only by judging the output voltage of the zero-crossing detection sub-circuit at a certain moment, and needs to judge whether the second feedback signal sent by the zero-crossing detection sub-circuit is received within a second preset time length. The second preset time period may be a time period determined in advance by human.

When the main control board determines that the switching device has a fault, an early warning signal can be sent out to remind a user of timely overhauling so as to ensure safety. Therefore, optionally, the main control board is further configured to: and after receiving the first feedback signal or the second feedback signal sent by the zero-crossing detection sub-circuit, sending out an early warning signal.

In the control circuit provided in the embodiment of the application, after the main control board sends the first level signal (that is, a signal indicating that the compressor stops operating) for indicating the switching device to turn off to the switching device, the main control board may receive the feedback signal corresponding to the first level signal through the zero-crossing detection sub-circuit. If the main control board receives a first feedback signal for indicating that the switching device is in a closed state, it can be determined that the switching device fails, and the compressor cannot be stopped according to the indication of the first level signal. At this time, in order to enable the refrigerant in the compressor to circulate through the condensers of the first fan and the second fan, the main control board may control the first fan and the second fan to start and operate. The main control board can determine whether the switching device for controlling the running state of the compressor fails or not through the signal fed back by the zero-crossing detection sub-circuit, so that when the switching device fails and the compressor cannot stop running, the main control board can control the first fan and the second fan to start running. Therefore, the refrigerant in the compressor can circulate through the condensers of the first fan and the second fan, and the problem that the compressor is damaged due to the fact that the refrigerant in the compressor cannot circulate is solved.

In order to more clearly illustrate the control circuit provided in the embodiments of the present application, an embodiment will be described in detail below.

As shown in fig. 4, the present embodiment provides a control circuit, and it can be seen that, compared with the control circuit shown in fig. 1 (i.e., the control circuit in the prior art), the control circuit connects a zero-crossing detection sub-circuit between the main control board and the relay switch K. The zero-crossing detection sub-circuit comprises a photoelectric coupler (the photoelectric coupler is arranged between A, B, C, E ports). The C port of the photoelectric coupler is connected with a power supply VCC2 through a resistor R3, the C port is connected with a main control board through a resistor R4, the E port is grounded, the A port is connected with a zero line inlet Nin through a resistor R1, and the B port is connected with a relay switch K.

Illustratively, when the relay switch K is closed, the voltage at the L out port and the voltage at the Nin port are sine wave signals, as shown in fig. 5, an input-output waveform diagram of the zero-crossing detection sub-circuit is provided.

At this time, the voltage of the L out port and the Nin port is 0, because the relay switch K is off, the photoelectric coupler is not on, that is, the port C and the port E are off, the signal fed back to the main control board by the zero-crossing detection sub-circuit is a signal of VCC2 obtained through a pull-up resistor R3, that is, a high level signal as shown in fig. 5.

Therefore, after the main control board sends the first level signal to the relay switch K, if the high-low level signal is received within the first preset time period, it can be determined that the relay switch K has a fault, and the compressor cannot be controlled to stop running. And because the main control board has already controlled the first fan M1 and the second fan M2 to stop operating, the refrigerant of the compressor can not circulate, so if the main control board receives the high-low level signal sent by the zero-crossing detection sub-circuit within the first preset time period, the main control board can control the first fan M1 and the second fan M2 to start operating, so as to ensure that the refrigerant of the compressor can circulate.

At this time, the voltage of the L out port and the Nin port is a sine wave signal, and the relay switch K is closed, so when the voltage between the L out port and the Nin port reaches a certain value, the photocoupler is turned on, and the voltage of the L out port and the Nin port is isolated and amplified by the photocoupler, and a high-low level signal as shown in fig. 5 is output, because the relay switch K is closed, the relay switch K fails, and the relay switch K cannot be closed after receiving the second level signal sent by the main control board, the voltage of the L out port and the Nin port is 0, and because the relay switch K is disconnected, the photocoupler is not turned on, i.e., the C port and the E port are disconnected, the signal fed back to the main control board by the zero-crossing detection sub-circuit is a signal of VCC2 obtained through a pull-up resistor R3, and the high level signal is shown in fig. 5.

Therefore, after the main control board sends the second level signal to the relay switch K, if the high level signal is received within the second preset time period, it can be determined that the relay switch K has a fault, and the compressor cannot be controlled to start and operate. At the moment, the main control board can send out an early warning signal to remind a user of timely overhauling.

In addition, as shown in fig. 4, a diode VD may be connected between the port a and the port B of the zero-cross detection sub-circuit to protect the freewheeling between the port a and the port B. In addition, a resistor R2 can be connected between the port A and the port B, and the resistor R2 is used for shunting to prevent the diode VD from being broken down.

The embodiment of the application also provides an indoor unit, and the indoor unit comprises the control circuit provided in the embodiment. In addition, this application embodiment still provides an air conditioner, including off-premises station and indoor set, wherein, the off-premises station includes compressor and second fan, and compressor and second fan can be connected with the main control board in the indoor set.

As shown in fig. 6, an embodiment of the present application further provides a control method, which may be applied to the control circuit, and includes S101 to S102:

s101, the main control board sends a first level signal to the switching device.

Wherein the first level signal is used for indicating that the switching device is turned off. The switching device is used for controlling the running state of the compressor, and when the switching device is in a closed state, the compressor runs; when the switching device is in an off state, the compressor stops operating.

S102, if the main control board receives a first feedback signal sent by the zero-crossing detection sub-circuit within a first preset time, the main control board controls the first fan and the second fan to start to operate.

The first feedback signal is used to indicate that the switching device is in a closed state.

Optionally, as shown in fig. 7, the control method may further include S103-S104:

and S103, the main control board sends a second level signal to the switching device.

The second level signal is used to indicate that the switching device is closed.

And S104, if the main control board receives a second feedback signal sent by the zero-crossing detection sub-circuit within a second preset time, controlling the first fan and the second fan to stop running.

The second feedback signal is used to indicate that the switching device is in an open state.

It is understood that, in practical applications, steps S103-S104 may precede steps S101-S102, and steps S103-S104 may follow steps S101-S102. That is, the sequence of steps S103 to S104 and steps S101 to S102 is not limited in this embodiment of the application.

Alternatively, as shown in fig. 8, step S102 may include S1021-S1022:

and S1021, if the main control board receives the first feedback signal sent by the zero-crossing detection sub-circuit within a first preset time period, acquiring the detection temperature of the temperature sensor.

And S1022, the main control board controls the operation modes of the first fan and the second fan according to the detected temperature.

The operation mode may be a cooling mode or a heating mode.

Alternatively, as shown in fig. 9, step S1022 may include S10221-S10222:

s10221, when the detected temperature is lower than the preset temperature, the main control board controls the first fan and the second fan to start a heating mode.

S10222, when the detected temperature is higher than the preset temperature, the main control board controls the first fan and the second fan to start the refrigeration mode.

Alternatively, as shown in fig. 10, after step S102, step S105 is also performed.

And S105, the main control board sends out an early warning signal.

It is understood that, after receiving the second feedback signal sent by the zero-crossing detection sub-circuit, the main control board may also send out an early warning signal, and also immediately after step S104, step S105 may also be executed.

As shown in fig. 11, an embodiment of the present application further provides a control device, which includes a memory 41, a processor 42, a bus 43, and a communication interface 44; the memory 41 is used for storing computer execution instructions, and the processor 42 is connected with the memory 41 through a bus 43; when the control device is operating, the processor 42 executes computer-executable instructions stored by the memory 41 to cause the control device to perform the control method provided in the above-described embodiments.

In particular implementations, processor 42(42-1 and 42-2) may include one or more Central Processing Units (CPUs), such as CPU0 and CPU1 shown in FIG. 11, as one example. And, as an example, the control device may include a plurality of processors 42, such as processor 42-1 and processor 42-2 shown in fig. 11. Each of the processors 42 may be a single-Core Processor (CPU) or a multi-Core Processor (CPU). Processor 42 may refer herein to one or more devices, circuits, and/or processing cores that process data (e.g., computer program instructions).

The memory 41 may be, but is not limited to, a read-only memory 41 (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), a magnetic disc storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory 41 may be self-contained and coupled to the processor 42 via a bus 43. The memory 41 may also be integrated with the processor 42.

In a specific implementation, the memory 41 is used for storing data in the present application and computer-executable instructions corresponding to software programs for executing the present application. The processor 42 may control various functions of the device by running or executing software programs stored in the memory 41, as well as invoking data stored in the memory 41.

Communication interface 44, using any transceiver or the like, is configured to communicate with other devices or communication networks, such as a control system, a Radio Access Network (RAN), a wireless local area network (W L AN), etc. communication interface 44 may include a receiving unit to implement a receiving function and a transmitting unit to implement a transmitting function.

The bus 43 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an extended ISA (enhanced industry standard architecture) bus, or the like. The bus 43 may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 11, but this is not intended to represent only one bus or type of bus.

For the explanation of the related contents in this embodiment, reference may be made to the above method embodiments, which are not described herein again.

Through the above description of the embodiments, it is clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the above described functions. For the specific working processes of the system, the apparatus and the unit described above, reference may be made to the corresponding processes in the foregoing method embodiments, and details are not described here again.

The embodiment of the present application further provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed by a computer, the computer is enabled to execute the control method provided by the foregoing embodiment.

The computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a RAM, a ROM, an erasable programmable read-only memory (EPROM), a register, a hard disk, an optical fiber, a CD-ROM, an optical storage device, a magnetic storage device, any suitable combination of the foregoing, or any other form of computer readable storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an Application Specific Integrated Circuit (ASIC). In embodiments of the present application, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.

The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A control circuit, comprising: the system comprises a switching device, a zero-crossing detection sub-circuit, a first fan and a main control board; the first port of the main control board is connected with the first port of the switch device; the second port of the switching device is respectively connected with the first port of the zero-crossing detection sub-circuit and the compressor; a second port of the zero-crossing detection sub-circuit is connected with a second port of the main control board; a third port of the main control board is connected with the first fan; a fourth port of the main control board is connected with a second fan;

the switching device is used for controlling the running state of the compressor; when the switching device is in a closed state, the compressor operates; when the switching device is in an off state, the compressor stops running;

the master control board is configured to:

transmitting a first level signal to the switching device; the first level signal is used for indicating that the switching device is opened;

if a first feedback signal sent by the zero-crossing detection sub-circuit is received within a first preset time length, controlling the first fan and the second fan to start to operate; the first feedback signal is used for indicating that the switching device is in a closed state.

2. The control circuit of claim 1, wherein the master control board is further configured to:

sending a second level signal to the switching device; the second level signal is used for indicating that the switching device is closed;

if a second feedback signal sent by the zero-crossing detection sub-circuit is received within a second preset time length, controlling the first fan and the second fan to stop running; the second feedback signal is used for indicating that the switching device is in an open state.

3. The control circuit of claim 1, further comprising a temperature sensor connected to a fifth port of the master control board, the master control board further configured to:

acquiring the detection temperature of the temperature sensor, and controlling the operation modes of the first fan and the second fan according to the detection temperature; the operation mode includes a cooling mode or a heating mode.

4. The control circuit of claim 3, wherein the master board body is configured to:

when the detected temperature is lower than a preset temperature, controlling the first fan and the second fan to start a heating mode;

and when the detected temperature is higher than the preset temperature, controlling the first fan and the second fan to start a refrigeration mode.

5. The control circuit of claim 2, wherein the master control board is further configured to:

and sending out an early warning signal after receiving the first feedback signal or the second feedback signal sent by the zero-crossing detection sub-circuit.

6. An indoor unit comprising a control circuit as claimed in any one of claims 1 to 5.

7. An air conditioner comprising an outdoor unit and the indoor unit of claim 6, wherein the outdoor unit comprises a compressor and a second fan.

8. A control method applied to the indoor unit according to claim 6, comprising:

transmitting a first level signal to the switching device; the first level signal is used for indicating that the switching device is opened; the switching device is used for controlling the running state of the compressor; when the switching device is in a closed state, the compressor operates; when the switching device is in an off state, the compressor stops running;

if a first feedback signal sent by the zero-crossing detection sub-circuit is received within a first preset time length, controlling a first fan and a second fan to start running; the first feedback signal is used for indicating that the switching device is in a closed state.

9. The control method according to claim 8, characterized by further comprising:

10. The control method according to claim 8, characterized by further comprising:

acquiring the detection temperature of a temperature sensor, and controlling the operation modes of the first fan and the second fan according to the detection temperature; the operation mode includes a cooling mode or a heating mode.

11. The control method according to claim 10, wherein the controlling the operation modes of the first fan and the second fan according to the detected temperature specifically comprises:

12. The control method according to claim 9, characterized by further comprising: