CN117928168A

CN117928168A - Defrosting control device and method for cooling equipment, electronic equipment and storage medium

Info

Publication number: CN117928168A
Application number: CN202211328484.3A
Authority: CN
Inventors: 刘健; 窦本和
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2022-10-26
Filing date: 2022-10-26
Publication date: 2024-04-26

Abstract

The present disclosure relates to a cooling device defrosting control device, a control method, an electronic device, and a storage medium. The cooling apparatus defrost control apparatus includes: a pressure sensor for acquiring a pressure value of an evaporator included in the cooling apparatus and outputting an output signal representing the pressure value; the hysteresis comparison circuit comprises a reverse input end which is connected with the output end of the pressure sensor, wherein the hysteresis comparison circuit is used for outputting a first control signal to switch on the power supply of the defrosting heater of the cooling equipment when the output signal of the pressure sensor is larger than a first threshold value of the hysteresis comparison circuit; and outputting a second control signal to turn off the power of the defrost heater when the output signal of the pressure sensor is less than a second threshold value of the hysteresis comparison circuit. The defrosting start and stop are controlled by detecting the pressure value of the evaporator in the cooling equipment, so that the flexibility is higher.

Description

Defrosting control device and method for cooling equipment, electronic equipment and storage medium

Technical Field

The disclosure relates to the technical field of intelligent control, in particular to a defrosting control device and method for cooling equipment, electronic equipment and a storage medium.

Background

Currently, cooling devices employing an air cooling mechanism are widely used in various fields. The cooling device employing the air cooling mechanism may condense a frost layer on its evaporator, and the frost layer may gradually thicken over time. Because the thermal conductivity of the frost is small, larger thermal resistance can be formed when the frost is covered on the evaporator, and if the frost layer on the evaporator is not removed in time, the cold in the evaporator can not be emitted, so that the refrigerating effect of the cooling equipment is affected.

In the related art, a defrosting operation in the cooling apparatus is mostly performed in a timing control manner. For example, the defrosting is controlled by an electrical signal sent at a timing, or the defrosting is timed by a mechanical timing method and stopped after a preset time for defrosting, so that the fan of the cooling device is restarted.

This timing defrost mode is inefficient and may increase the energy consumption of the cooling device and even present a safety hazard.

Disclosure of Invention

To overcome the problems in the related art, the present disclosure provides a cooling apparatus defrost control apparatus, a control method, an electronic apparatus, and a storage medium.

According to a first aspect of embodiments of the present disclosure, there is provided a cooling apparatus defrost control apparatus, the cooling apparatus defrost control apparatus comprising:

a pressure sensor for acquiring a pressure value of an evaporator included in the cooling apparatus and outputting an output signal representing the pressure value;

the hysteresis comparison circuit comprises a reverse input end which is connected with the output end of the pressure sensor;

The hysteresis comparison circuit is used for outputting a first control signal to switch on a power supply of the defrosting heater of the cooling equipment when the output signal of the pressure sensor is larger than a first threshold value of the hysteresis comparison circuit; and outputting a second control signal to turn off the power of the defrost heater when the output signal of the pressure sensor is less than a second threshold value of the hysteresis comparison circuit.

In an embodiment of the disclosure, the apparatus further comprises:

The first compensation circuit compensates errors generated by output signals of the pressure sensor due to wind speed change when a fan gear of the cooling equipment is switched.

In an embodiment of the disclosure, the first compensation circuit includes N first compensation branches, where N is a natural number;

Each of the N first compensation branches comprises a first switch and a first voltage dividing resistor which are connected in series, one end of the first switch is connected with the reverse input end of the hysteresis comparison circuit, the other end of the first switch is connected with one end of the first voltage dividing resistor, and the other end of the first voltage dividing resistor is grounded.

In an embodiment of the disclosure, each of the N first compensating branches corresponds to one gear of the cooling device fan, and the first compensating branches are connected in parallel;

when the fan gear is switched, the first switches of the first compensation branches corresponding to the switched fan working gears are turned on, and the first switches of the other first compensation branches are turned off.

In an embodiment of the disclosure, the resistance value of the first voltage dividing resistor is proportional to the wind speed corresponding to the working gear of the fan of the cooling device.

In an embodiment of the disclosure, the apparatus further comprises:

and the second compensation circuit compensates errors generated by output signals of the pressure sensor due to air flow change when a cabinet door of the cooling equipment is opened or closed.

In an embodiment of the disclosure, the second compensation circuit includes a second compensation branch and a third compensation branch;

the second compensation branch circuit comprises a second switch and a second voltage dividing resistor which are connected in series, one end of the second switch is connected with the reverse input end of the hysteresis comparison circuit, the other end of the second switch is connected with one end of the second voltage dividing resistor, and the other end of the second voltage dividing resistor is grounded;

the third compensation branch circuit comprises a third switch and a third voltage dividing resistor which are connected in series, one end of the third switch is connected with the reverse input end of the hysteresis comparison circuit, the other end of the third switch is connected with one end of the third voltage dividing resistor, and the other end of the third voltage dividing resistor is grounded.

In an embodiment of the disclosure, when a cabinet door of the cooling device is opened, the second switch is turned on, and the third switch is turned off; and

When the cabinet door of the cooling equipment is closed, the third switch is turned on, and the second switch is turned off.

In an embodiment of the disclosure, a resistance value of the second voltage dividing resistor is greater than a resistance value of the third voltage dividing resistor.

In an embodiment of the disclosure, the third switch is opened after a cabinet door of the cooling device is closed for a first time threshold.

According to a second aspect of the embodiments of the present disclosure, there is provided a cooling apparatus defrost control method including:

acquiring an output signal of a pressure sensor, wherein the pressure sensor is used for acquiring a pressure value of an evaporator included in the cooling equipment and outputting an output signal representing the pressure value;

inputting an output signal of the pressure sensor to an inverting input end of a hysteresis comparison circuit;

when the output signal of the pressure sensor is larger than a first threshold value of the hysteresis comparison circuit, defrosting is started; and

And stopping defrosting when the output signal of the pressure sensor is smaller than the second threshold value of the hysteresis comparison circuit.

In an embodiment of the disclosure, the inputting the output signal of the pressure sensor to the inverting input terminal of the hysteresis comparison circuit includes:

Based on the first compensation circuit, compensating the output signal of the pressure sensor, and inputting the compensated output signal of the pressure sensor to the reverse input end of the hysteresis comparison circuit;

The first compensation circuit is a fan compensation circuit and is used for compensating errors generated by output signals of the pressure sensor due to wind speed change when the fan gear of the cooling equipment is switched.

In an embodiment of the disclosure, the first compensation circuit includes N first compensation branches, each of the first compensation branches is connected in parallel, and N is a natural number;

Each first compensation branch circuit of the N first compensation branch circuits comprises a first switch and a first voltage dividing resistor which are connected in series, one end of the first switch is connected with the reverse input end of the hysteresis comparison circuit, the other end of the first switch is connected with one end of the first voltage dividing resistor, and the other end of the first voltage dividing resistor is grounded; the compensating the output signal of the pressure sensor based on the first compensating circuit comprises:

when the fan gear is switched, the first switches of the first compensation branches corresponding to the switched fan working gear in the first compensation circuit are controlled to be conducted, and the first switches of the other first compensation branches are controlled to be disconnected.

Based on the second compensation circuit, compensating the output signal of the pressure sensor, and inputting the compensated output signal of the pressure sensor to the reverse input end of the hysteresis comparison circuit;

the second compensation circuit is a door opening and closing compensation circuit and is used for compensating errors generated by output signals of the pressure sensor due to air flow change when a cabinet door of the cooling equipment is opened or closed.

The third compensation branch circuit comprises a third switch and a third voltage dividing resistor which are connected in series, one end of the third switch is connected with the reverse input end of the hysteresis comparison circuit, the other end of the third switch is connected with one end of the third voltage dividing resistor, and the other end of the third voltage dividing resistor is grounded;

the compensating the output signal of the pressure sensor based on the second compensating circuit comprises:

When the cabinet door of the cooling equipment is opened, the second switch is controlled to be turned on, and the third switch is controlled to be turned off; and

And when the cabinet door of the cooling equipment is closed, controlling the third switch to be turned on and the second switch to be turned off.

In an embodiment of the disclosure, the method further comprises: and after the cabinet door of the cooling equipment is closed by a first time threshold, controlling the third switch to be opened.

According to a third aspect of the embodiments of the present disclosure, there is provided a cooling apparatus defrost control apparatus comprising:

the acquisition module is used for acquiring output signals of a pressure sensor, wherein the pressure sensor is used for acquiring pressure values of an evaporator included in the cooling equipment and outputting output signals representing the pressure values;

the input module is used for inputting the output signal of the pressure sensor to the reverse input end of the hysteresis comparison circuit;

The control module is used for starting defrosting when the output signal of the pressure sensor is larger than a first threshold value of the hysteresis comparison circuit; and

According to a fourth aspect of embodiments of the present disclosure, there is provided an electronic device comprising:

A processor;

A memory for storing processor-executable instructions;

wherein the processor is configured to perform the method of any of the second aspects.

According to a fifth aspect of embodiments of the present disclosure, there is provided a storage medium having instructions stored therein, which when executed by a processor of a cooling device, enable the cooling device to perform the method of any one of the second aspects.

The technical scheme provided by the embodiment of the disclosure can comprise the following beneficial effects: the start and stop of defrosting can be controlled by detecting the pressure value of the evaporator in the cooling device, and compared with the scheme of starting and closing defrosting at fixed time in the prior art by a mechanical timing mode, the defrosting control device has higher flexibility.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a schematic diagram of a cooling apparatus shown according to an exemplary embodiment.

Fig. 2 is a block diagram showing a defrosting control device of a cooling apparatus according to an exemplary embodiment

Fig. 3 is a flowchart illustrating a cooling apparatus defrost control method according to an exemplary embodiment.

Fig. 4 is a timing chart illustrating a cooling apparatus defrost control method according to an exemplary embodiment.

Fig. 5 is a block diagram illustrating a cooling apparatus defrost control apparatus according to an exemplary embodiment.

Fig. 6 is a block diagram illustrating an apparatus for controlling defrosting of a cooling device according to an exemplary embodiment.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure.

As mentioned above, in the related art, the defrosting operation in the cooling apparatus is mostly performed in a timing control manner. For example, in some cooling devices, defrost control is achieved in the following manner: when the compressor runs for a certain time, the defrosting temperature controller closely attached to the evaporator is conducted at the temperature of minus 14 ℃, at this time, the defrosting timer runs (the inside of the defrosting timer is provided with a large plastic gear cam structure and a plurality of pairs of electrical contacts), when the compressor runs for about 8 hours in a cumulative way, the defrosting timer just walks to the position for turning on defrosting, at this time, the defrosting heater is turned on to heat defrosting, the defrosting layer on the evaporator starts to heat and defrost, when the defrosting temperature controller senses that the defrosting temperature controller is at plus 5 ℃, the contacts of the defrosting temperature controller are disconnected, the defrosting temperature controller stops working, the defrosting timer starts to run, and after about 2 minutes, the defrosting position is skipped due to the action of the cam, the next turn of the compressor loop is conducted.

The method can not better feed back the influence of the heat load and the wet load on the frosting amount in the actual use process, so that the phenomenon that the defrosting process is too late or too early is easy to cut in, the thermal resistance of the surface of the evaporator is increased, the refrigeration power is reduced, and the energy consumption of the cooling equipment is improved. Meanwhile, since defrosting time is fixed, defrosting cannot be stopped in time, the situation that the defrosting heater still works after the frost layer covered on the surface of the evaporator is completely melted can occur, and further the defrosting heater works overtime, so that a fuse is broken, and even refrigerator equipment is damaged.

In view of this, the embodiments of the present disclosure provide a defrosting control device for a cooling apparatus, which controls the start and stop of defrosting by detecting the pressure value of an evaporator in the cooling apparatus, and has higher flexibility than the scheme of turning on and off defrosting at fixed times by means of mechanical timing in the related art.

Fig. 1 is a schematic view of a cooling apparatus according to an exemplary embodiment, and as shown in fig. 1, a defrosting control method provided by an embodiment of the present disclosure may be applied to a cooling apparatus, and the cooling apparatus 1 may include a pressure sensor 2, an evaporator 3, a defrosting heater 4, and a cooling apparatus defrosting control device 5. The pressure sensor 2 may be one or more, and is typically disposed at the bottom of the evaporator, and is configured to collect a pressure value of the evaporator 3 and convert the pressure value into an output signal of the pressure sensor 2. The defrost heater 4 is disposed adjacent to the evaporator 3 for providing heat to the evaporator 3 when turned on to defrost the evaporator 3. The cooling device defrosting control device 5 is connected to the pressure sensor 2 and the defrosting heater 4, and is configured to receive an output signal of the pressure sensor 2, obtain a corresponding control signal according to the output signal of the pressure sensor 2, and output the control signal to the defrosting heater 4, so as to control the defrosting heater 4 to be turned on and off. Further, the cooling device 1 may further comprise a cabinet door and a fan (not shown in the figure), which may be operated in different gear positions to achieve different cooling effects according to the user's needs. The cabinet door can be opened or closed, a signal for opening and closing the cabinet door can be acquired and sent to the defrosting control device 5 of the cooling equipment, and gear information of the fan operation can also be acquired and sent to the defrosting control device 5 of the cooling equipment, so that the defrosting control device 5 of the cooling equipment obtains the control signal based on the information and outputs the control signal to the defrosting heater 4, and the starting and stopping of defrosting of the cooling equipment are controlled.

Fig. 2 is a structural view showing a defrosting control device of a cooling equipment according to an exemplary embodiment, and as shown in fig. 2, the defrosting control device of a cooling equipment includes:

and the pressure sensor is used for acquiring the pressure value of the evaporator included in the cooling equipment and outputting an output signal representing the pressure value.

The hysteresis comparison circuit comprises an inverted input end which is connected with the output end of the pressure sensor.

In the embodiment of the disclosure, the cooling device may be an air-cooled refrigerator, freezer, etc., or other cooling devices, which is not limited herein. The defrosting control device of the cooling equipment can be positioned inside the cooling equipment or outside the cooling equipment and is connected with the cooling equipment in a wired or wireless mode. The defrosting control device of the cooling equipment can be further connected with each information acquisition unit and each processing unit in the cooling equipment, such as a pressure sensor, an information acquisition unit for acquiring information of a switch cabinet door of the cooling equipment, an information acquisition unit for acquiring information of a working gear of a fan of the cooling equipment, and/or a processing unit for preprocessing each acquired information.

In the embodiment of the disclosure, the inverting input end of the hysteresis comparison circuit may be directly connected to the output signal Uin of the pressure sensor, or may be connected to the output signal Uin of the pressure sensor through an inverting input resistor R0, where the output signal Uin of the pressure sensor is a signal corresponding to the pressure value of the evaporator in the cooling device. The positive input end of the hysteresis comparison circuit can be connected with the reference signal Ur through a positive input resistor R1, and a feedback resistor R2 is arranged between the output end and the positive input end.

The working principle of the hysteresis comparator is as follows: when the input signal of the reverse input end is changed from small to large to a first threshold value or the input signal of the reverse input end is changed from large to small to a second threshold value, the output signal of the hysteresis comparison circuit is turned over, and the output signals of the hysteresis comparison circuit in other times are kept unchanged. Assuming that the high level output signal of the hysteresis comparison circuit is Uoh and the low level output signal is Uol, the first threshold value Uh and the second threshold value Ul of the hysteresis comparison circuit can be calculated by the following formula:

When the output signal of the pressure sensor is larger than a first threshold value Uh of the hysteresis comparison circuit, outputting a first control signal to switch on a power supply of a defrosting heater of the cooling equipment so as to start defrosting; and outputting a second control signal to turn off the power of the defrosting heater when the output signal of the pressure sensor is smaller than a second threshold Ul of the hysteresis comparison circuit, so as to stop defrosting.

By adopting the technical scheme of the embodiment of the disclosure, the starting and stopping of defrosting can be controlled by detecting the pressure value of the evaporator in the cooling equipment, and compared with the scheme of starting and closing defrosting at fixed time in the prior art by a mechanical timing mode, the defrosting control device has higher flexibility.

When the fan in the cooling equipment changes the working gear, the influence of the fluctuation of the air flow in the cooling equipment on the pressure value acquired by the pressure sensor can be caused, so that the output signal of the pressure sensor generates errors.

The fan is usually located above the evaporator in the cooling device, when the gear of the fan is switched to increase the rotating speed of the fan, the air pressure around the fan is reduced, so that the evaporator receives an upward force, and the pressure value of the evaporator detected by the pressure sensor is reduced. Conversely, when the gear of the fan is switched to reduce the rotating speed of the fan, the air pressure around the fan is increased, so that the evaporator is subjected to a downward force, and the pressure value of the evaporator detected by the pressure sensor is increased.

In view of this, the embodiment of the present disclosure further provides a first compensation circuit for compensating an error generated in an output signal of the pressure sensor due to a change in wind speed when a fan gear of the cooling apparatus is switched.

In an embodiment of the disclosure, the first compensation circuit includes N first compensation branches, where N is a natural number; each of the N first compensation branches comprises a first switch and a first voltage dividing resistor which are connected in series, one end of the first switch is connected with the reverse input end of the hysteresis comparison circuit, the other end of the first switch is connected with one end of the first voltage dividing resistor, and the other end of the first voltage dividing resistor is grounded.

Referring to fig. 2, the case where the first compensation circuit 21 includes three first compensation branches is shown in the cooling apparatus defrost control apparatus shown in fig. 2. In other applications, the number of gear positions in the cooling device where the fan can operate, the number of gear positions to be compensated, etc. is set, and the number of the first compensation circuits is not limited herein.

The three first compensating branches in fig. 2 may be divided into a low-speed first compensating branch, a medium-speed first compensating branch and a high-speed first compensating branch, where the low-speed first compensating branch includes a first switch K1 corresponding to a low-speed gear wind speed and a first voltage dividing resistor R3 corresponding to a low-speed gear wind speed that are connected in series, where the first voltage dividing resistor R3 corresponding to the low-speed gear wind speed may include a single resistor, or may be formed by connecting a plurality of resistors in parallel, so as to further compensate an error of an output signal of the pressure sensor caused by a change when the current gear wind speed of the fan changes. Fig. 2 shows a case where the first voltage dividing resistor R3 corresponding to the low speed gear wind speed is composed of two resistors R3' and R3 "connected in parallel. The first compensation branch of the middle speed gear comprises a first switch K2 corresponding to the wind speed of the middle speed gear and a first divider resistor R4 corresponding to the wind speed of the middle speed gear which are connected in series, the first compensation branch of the high speed gear comprises a first switch K3 corresponding to the wind speed of the high speed gear and a first divider resistor R5 corresponding to the wind speed of the high speed gear which are connected in series, and likewise, the first divider resistor R4 corresponding to the wind speed of the middle speed high speed gear and the first divider resistor R5 corresponding to the wind speed of the high speed gear can also comprise a single resistor or be formed by connecting a plurality of resistors in parallel. Fig. 2 shows a case where the first voltage dividing resistor R4 corresponding to the medium speed gear wind speed is composed of two resistors R4 'and R4 "connected in parallel, and the first voltage dividing resistor R5 corresponding to the high speed gear wind speed is composed of two resistors R5' and R5" connected in parallel.

In this embodiment of the disclosure, each of the N first compensating branches corresponds to one gear of the cooling device fan, and each first compensating branch is connected in parallel, when the gear of the fan is switched, the first switch of the first compensating branch corresponding to the switched fan working gear is turned on, and the first switches of the other first compensating branches are turned off.

Referring to fig. 2, the low-speed first compensating branch, the medium-speed first compensating branch and the high-speed first compensating branch are respectively arranged at a low speed, a medium speed and a high speed corresponding to the operation of the fan of the cooling device. Namely, when the fan works in a low-speed gear, the first switch K1 corresponding to the low-speed gear wind speed in the first compensation branch of the low-speed gear is turned on, and the first switches of other first compensation branches are turned off; when the fan works in a middle speed gear, a first switch K2 corresponding to the middle speed gear wind speed in a first compensation branch of the middle speed gear is turned on, and first switches of other first compensation branches are turned off; when the fan works in a high-speed gear, the first switch K3 corresponding to the high-speed gear wind speed in the first compensation branch circuit of the high-speed gear is turned on, and the first switches of the other first compensation branch circuits are turned off.

As described above, when the fan is shifted from the low gear to the high gear, the wind speed increases, the evaporator receives an upward force, and the pressure value collected by the pressure sensor becomes small, so that the output signal of the pressure sensor becomes small, and at this time, in order to compensate the output signal of the pressure sensor, the signal value of the reverse input end of the hysteresis comparison circuit needs to be increased. Therefore, the resistance value of the first voltage dividing resistor can be set to be in direct proportion to the wind speed corresponding to the working gear of the fan of the cooling equipment. In detail, referring to fig. 2, a first voltage dividing resistor R5 corresponding to the high-speed gear wind speed > a first voltage dividing resistor R4 corresponding to the medium-speed gear wind speed > a first voltage dividing resistor R3 corresponding to the low-speed gear wind speed may be set.

By adopting the mode, when the fan gear is switched, the first compensation branch corresponding to the switched gear in the first compensation circuit is controlled to be conducted, and other compensation branches are controlled to be disconnected, so that errors generated by output signals of the pressure sensor due to wind speed change are compensated when the fan gear of the cooling equipment is switched, the precision of defrosting control is further improved, and the energy consumption is reduced.

When the cabinet door of the cooling equipment is opened and closed, the influence of the fluctuation of the air flow in the cooling equipment on the pressure value acquired by the pressure sensor can be caused, and the output signal of the pressure sensor is error.

Specifically, when the cabinet door of the cooling device is opened, an outward air flow disturbance may be generated, so that the evaporator is subjected to an upward force, and the pressure value of the evaporator detected by the pressure sensor becomes smaller; conversely, when the cabinet door of the cooling device is closed, an inward air flow disturbance may be generated, which causes the evaporator to receive a downward force, and thus causes the pressure value of the evaporator detected by the pressure sensor to become large. If these fan gear switching and/or door opening/closing operations occur when the first input signal derived from the output signal of the sensor is just near the first threshold value or the second threshold value, false start of the defrosting operation may be triggered, the defrosting operation is started in advance when defrosting is not needed, power consumption is increased, or the defrosting operation is still performed when defrosting can be stopped, so that the defrosting heater is overtime, and potential safety hazards may be brought about while the power consumption is increased, for example, a fuse may be short-circuited or refrigerator equipment may be damaged.

In view of this, the embodiment of the present disclosure further provides a second compensation circuit for compensating an error generated in an output signal of the pressure sensor due to a change in air flow when a cabinet door of the cooling apparatus is opened or closed.

In an embodiment of the disclosure, the second compensation circuit includes a second compensation branch and a third compensation branch; the second compensation branch circuit comprises a second switch and a second voltage dividing resistor which are connected in series, one end of the second switch is connected with the reverse input end of the hysteresis comparison circuit, the other end of the second switch is connected with one end of the second voltage dividing resistor, and the other end of the second voltage dividing resistor is grounded; the third compensation branch circuit comprises a third switch and a third voltage dividing resistor which are connected in series, one end of the third switch is connected with the reverse input end of the hysteresis comparison circuit, the other end of the third switch is connected with one end of the third voltage dividing resistor, and the other end of the third voltage dividing resistor is grounded. The second switch and the third switch can be two independent switches or a single-pole double-throw switch.

Referring to fig. 2, the cooling apparatus defrost control illustrated in fig. 2 shows a case where the second compensation circuit 22 includes a second compensation branch and a third compensation branch, the second and third switches being one single pole double throw switch K4. One end of the single-pole double-throw switch K4 is connected to the reverse input end of the hysteresis comparison circuit, and the other end of the single-pole double-throw switch K is connected to the second voltage dividing resistor R6 and the third voltage dividing resistor R7 respectively.

In the embodiment of the disclosure, when the cabinet door of the cooling device is opened, the second switch is turned on, and the third switch is turned off; when the cabinet door of the cooling equipment is closed, the third switch is turned on, and the second switch is turned off. In the circuit shown in fig. 2, when the cabinet door of the cooling device is opened, the single-pole double-throw switch K4 is connected to the second compensation branch, and the connection between the third compensation branch and the inverting input end of the hysteresis comparison circuit is disconnected, so as to compensate the error of the output signal of the pressure sensor caused by air flow disturbance when the door is opened; when the cabinet door of the cooling equipment is closed, the single-pole double-throw switch K4 is connected to the third compensation branch, and the connection between the second compensation branch and the reverse input end of the hysteresis comparison circuit is disconnected so as to compensate the error of the output signal of the pressure sensor caused by air flow disturbance when the door is closed.

As mentioned above, when the cabinet door of the cooling device is opened, an outward air flow disturbance may be generated, resulting in a smaller output signal of the pressure sensor, and in this case, in order to compensate the output signal of the pressure sensor, the signal value of the inverting input end of the hysteresis comparison circuit needs to be increased; when the cabinet door of the cooling device is closed, an inward air flow disturbance may be generated, which causes the output signal of the pressure sensor to change, and in this case, in order to compensate the output signal of the pressure sensor, the signal value of the inverting input end of the hysteresis comparison circuit needs to be reduced. Therefore, the resistance value of the second voltage dividing resistor may be set to be larger than the resistance value of the third voltage dividing resistor.

By adopting the mode, when the cabinet door of the cooling equipment is opened or closed, the error generated by the output signal of the pressure sensor caused by air flow disturbance caused by opening and closing the door can be compensated through the second compensation branch circuit and the third compensation branch circuit, so that the defrosting control precision is further improved, and the energy consumption is reduced.

In the embodiment of the disclosure, when the cabinet door is closed for a period of time, the disturbance of the air flow is stopped, the air flow is restored to be stable, and the output signal of the pressure sensor does not need to be compensated through the third compensation branch. Therefore, the third switch can be controlled to be closed after the cabinet door of the cooling device is closed by a first time threshold, so that the output signal of the pressure sensor is prevented from being compensated by the third compensation branch after the air flow is stabilized, and a new error is caused. In practical use, the first time threshold may be determined according to the time for which the airflow is restored to be stable after the door is closed, which is not limited herein. In the circuit shown in fig. 2, when the second compensating branch and the third compensating branch share a single-pole double-throw switch K4, the single-pole double-throw switch K4 can be controlled to be turned off after the cabinet door of the cooling device is turned off by a first time threshold, so as to avoid generating a new error.

In this embodiment of the disclosure, the second compensation circuit may further include a third compensation branch, where the third compensation branch includes a fifth switch K5 and a dc source U1 connected in series, one end of the fifth switch K5 is connected to the inverting input end of the hysteresis comparison circuit, the other end is connected to the positive electrode of the dc source U1, and the negative electrode of the dc source U1 is grounded and used for compensating the offset voltage of the hysteresis comparison circuit.

Fig. 3 is a flowchart illustrating a cooling apparatus defrost control method according to an exemplary embodiment, as shown in fig. 3, comprising the steps of:

In step S31, an output signal of a pressure sensor for acquiring a pressure value of an evaporator included in the cooling apparatus is acquired, and an output signal representing the pressure value is output.

In step S32, the output signal of the pressure sensor is input to the inverting input terminal of the hysteresis comparison circuit.

In step S33, when the output signal of the pressure sensor is greater than the first threshold value of the hysteresis comparison circuit, defrosting is started; and stopping defrosting when the output signal of the pressure sensor is smaller than the second threshold value of the hysteresis comparison circuit.

In an embodiment of the present disclosure, first, an output signal of a pressure sensor for acquiring a pressure value of an evaporator in the cooling apparatus and outputting an output signal representing the pressure value may be acquired.

In the embodiment of the disclosure, after the output signal of the pressure sensor is obtained, the output signal of the pressure sensor may be input to the inverting input terminal of the hysteresis comparison circuit. In some embodiments of the disclosure, the output signal may be directly input to the inverting input terminal of the hysteresis comparison circuit, or the output signal may be converted by the inverting input resistor and then input to the inverting input terminal of the hysteresis comparison circuit, or the output circuit may be compensated based on the compensation circuit first, and then the compensated signal is directly input to the inverting input terminal of the hysteresis comparison circuit or input to the inverting input terminal of the hysteresis comparison circuit through the inverting input resistor.

In an embodiment of the present disclosure, the inputting the output signal of the pressure sensor to the inverting input terminal of the hysteresis comparison circuit may include: based on the first compensation circuit, compensating the output signal of the pressure sensor, and inputting the compensated output signal of the pressure sensor to the reverse input end of the hysteresis comparison circuit; the first compensation circuit is a fan compensation circuit and is used for compensating errors generated by output signals of the pressure sensor due to wind speed change when the fan gear of the cooling equipment is switched.

In the embodiment of the disclosure, the first compensation circuit includes N first compensation branches, each of the first compensation branches is connected in parallel, and N is a natural number; each of the N first compensation branches comprises a first switch and a first voltage dividing resistor which are connected in series, one end of the first switch is connected with the reverse input end of the hysteresis comparison circuit, the other end of the first switch is connected with one end of the first voltage dividing resistor, and the other end of the first voltage dividing resistor is grounded. The compensating the output signal based on the first compensation circuit includes: when the fan gear is switched, the first switches of the first compensation branches corresponding to the switched fan working gear in the first compensation circuit are controlled to be conducted, and the first switches of the other first compensation branches are controlled to be disconnected.

In an embodiment of the present disclosure, the inputting the output signal of the pressure sensor to the inverting input terminal of the hysteresis comparison circuit may include: based on the second compensation circuit, compensating the output signal of the pressure sensor, and inputting the compensated output signal of the pressure sensor to the reverse input end of the hysteresis comparison circuit; the second compensation circuit is a door opening and closing compensation circuit and is used for compensating errors generated by output signals of the pressure sensor due to air flow change when a cabinet door of the cooling equipment is opened or closed.

In an embodiment of the disclosure, the second compensation circuit includes a second compensation branch and a third compensation branch; the second compensation branch circuit comprises a second switch and a second voltage dividing resistor which are connected in series, one end of the second switch is connected with the reverse input end of the hysteresis comparison circuit, the other end of the second switch is connected with one end of the second voltage dividing resistor, and the other end of the second voltage dividing resistor is grounded; the third compensation branch circuit comprises a third switch and a third voltage dividing resistor which are connected in series, one end of the third switch is connected with the reverse input end of the hysteresis comparison circuit, the other end of the third switch is connected with one end of the third voltage dividing resistor, and the other end of the third voltage dividing resistor is grounded. The compensating the output signal of the pressure sensor based on the second compensating circuit comprises: when the cabinet door of the cooling equipment is opened, the second switch is controlled to be turned on, and the third switch is controlled to be turned off; and when the cabinet door of the cooling equipment is closed, controlling the third switch to be turned on and the second switch to be turned off.

According to the technical scheme of the embodiment of the disclosure, the starting and stopping of defrosting can be controlled by detecting the pressure value of the evaporator in the cooling equipment, and compared with the scheme of starting and closing defrosting at fixed time in the prior art by a mechanical timing mode, the defrosting control device has higher flexibility. Meanwhile, the first compensation circuit and the second compensation circuit compensate the gear change of the fan and the output signal error of the pressure sensor caused by the switch cabinet door, so that the defrosting precision is further improved, misoperation is avoided, energy consumption is reduced, and the service life of the cooling equipment is prolonged.

Fig. 4 shows a timing chart of a cooling apparatus defrost control method according to an embodiment of the present disclosure, as shown in fig. 4, and ideally, the output signal of the pressure sensor is shown as curve 41: at time t0-t1, the hysteresis comparator outputs a low level signal Uol, the defrosting heater works, and the compressor does not work; at time t1, the hysteresis comparator outputs a high level signal Uoh; at the time t1-t2, water vapor is frosted on the evaporator when encountering cold, the thickness of a frost layer is accumulated slowly, the pressure sensor collects the weight of the whole evaporator, an output signal Uin of the pressure sensor is increased slowly, when the input value of the reverse input end of the hysteresis comparator is larger than a first threshold value Uh, the hysteresis comparator turns over to output a low-level signal Ul, the compressor stops working, and the defrosting heater is powered on; at time t2-t3, the defrosting heater starts heating and defrosting, the mass of the frost layer is slowly reduced, the weight of the evaporator is slowly reduced, the output signal value Uin of the pressure sensor is slowly reduced, when the input value of the reverse input end of the hysteresis comparator is smaller than the second threshold Ul, the hysteresis comparator turns over to output a high-level signal Ulh, the power supply of the defrosting heater is disconnected, the defrosting is finished, and the compressor starts refrigerating again, so that the circulation work is realized.

However, at time t2, when the output signal Uin of the pressure sensor approaches the first threshold value Uh, the gear of the fan is changed to increase the wind speed, or a door opening/closing event occurs in the door of the cooling device, the output signal of the pressure sensor may be reduced due to the airflow disturbance, and the actual waveform at this time is shown as a curve 42 in the figure, at which time the initiated defrosting operation may be delayed. By the first compensation circuit and the second compensation provided by the embodiment of the disclosure, the compensation branch circuit can be switched to compensate the output signal of the pressure sensor, so that the misoperation is avoided.

Likewise, at time t3, when the output signal Uin of the pressure sensor approaches the second threshold value Ul, the gear of the fan is changed to reduce the wind speed, or the door of the cooling device is opened or closed, the output signal of the pressure sensor may be increased due to the airflow disturbance, and the actual waveform is shown as a curve 42, at this time, and the stopped defrosting operation may be delayed. By the first compensation circuit and the second compensation provided by the embodiment of the disclosure, the compensation branch circuit can be switched to compensate the output signal of the pressure sensor, so that the misoperation is avoided.

Fig. 4 shows a timing chart when the output signal of the pressure sensor is kept horizontal, corresponding to the time when the cooling apparatus is at a standstill for cold insulation. At this time, the fan of the cooling device stops working, the evaporator does not emit cool air, so no new frost layer is formed in the evaporator, and the output signal of the pressure sensor is kept unchanged.

Based on the same conception, the embodiment of the disclosure also provides a defrosting control device of the cooling equipment.

It will be appreciated that, in order to achieve the above-described functions, the defrosting control device for a cooling device provided in the embodiments of the present disclosure includes a hardware structure and/or a software module that perform the respective functions. The disclosed embodiments may be implemented in hardware or a combination of hardware and computer software, in combination with the various example elements and algorithm steps disclosed in the embodiments of the disclosure. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Those skilled in the art may implement the described functionality using different approaches for each particular application, but such implementation is not to be considered as beyond the scope of the embodiments of the present disclosure.

Fig. 5 is a block diagram illustrating a cooling apparatus defrost control apparatus according to an exemplary embodiment, as shown in fig. 5, comprising:

An acquisition module 51 for acquiring an output signal of a pressure sensor for acquiring a pressure value of an evaporator included in the cooling apparatus and outputting an output signal representing the pressure value.

And an input module 52, configured to input an output signal of the pressure sensor to an inverting input terminal of the hysteresis comparison circuit.

The control module 53 is configured to start defrosting when an output signal of the pressure sensor is greater than a first threshold value of the hysteresis comparison circuit; and stopping defrosting when the output signal of the pressure sensor is smaller than the second threshold value of the hysteresis comparison circuit.

Fig. 6 is a block diagram illustrating an apparatus 300 for controlling defrosting of a cooling device according to an exemplary embodiment. For example, the apparatus 300 may be a cooling device, such as a refrigerator, freezer, or the like.

Referring to fig. 6, the apparatus 300 may include one or more of the following components: a processing component 302, a memory 304, a power component 306, a multimedia component 308, an audio component 310, an input/output (I/O) interface 312, a sensor component 314, and a communication component 316.

The processing component 302 generally controls overall operation of the apparatus 300, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing component 302 may include one or more processors 320 to execute instructions to perform all or part of the steps of the methods described above. Further, the processing component 302 can include one or more modules that facilitate interactions between the processing component 302 and other components. For example, the processing component 302 may include a multimedia module to facilitate interaction between the multimedia component 308 and the processing component 302.

Memory 304 is configured to store various types of data to support operations at apparatus 300. Examples of such data include instructions for any application or method operating on the device 300, contact data, phonebook data, messages, pictures, videos, and the like. The memory 304 may be implemented by any type or combination of volatile or nonvolatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk.

The power component 306 provides power to the various components of the device 300. The power components 306 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for the device 300.

The multimedia component 308 includes a screen between the device 300 and the user that provides an output interface. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from a user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensor may sense not only the boundary of a touch or slide action, but also the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 308 includes a front-facing camera and/or a rear-facing camera. The front-facing camera and/or the rear-facing camera may receive external multimedia data when the apparatus 300 is in an operational mode, such as a photographing mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have focal length and optical zoom capabilities.

The audio component 310 is configured to output and/or input audio signals. For example, the audio component 310 includes a Microphone (MIC) configured to receive external audio signals when the device 300 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may be further stored in the memory 304 or transmitted via the communication component 316. In some embodiments, audio component 310 further comprises a speaker for outputting audio signals.

The I/O interface 312 provides an interface between the processing component 302 and peripheral interface modules, which may be a keyboard, click wheel, buttons, etc. These buttons may include, but are not limited to: homepage button, volume button, start button, and lock button.

The sensor assembly 314 includes one or more sensors for providing status assessment of various aspects of the apparatus 300. For example, the sensor assembly 314 may detect the on/off state of the device 300, the relative positioning of the components, such as the display and keypad of the device 300, the sensor assembly 314 may also detect a change in position of the device 300 or a component of the device 300, the presence or absence of user contact with the device 300, the orientation or acceleration/deceleration of the device 300, and a change in temperature of the device 300. The sensor assembly 314 may include a proximity sensor configured to detect the presence of nearby objects in the absence of any physical contact. The sensor assembly 314 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 314 may also include an acceleration sensor, a gyroscopic sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

The communication component 316 is configured to facilitate communication between the apparatus 300 and other devices, either wired or wireless. The device 300 may access a wireless network based on a communication standard, such as WiFi,2G or 3G, or a combination thereof. In one exemplary embodiment, the communication component 316 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 316 further includes a Near Field Communication (NFC) module to facilitate short range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, ultra Wideband (UWB) technology, bluetooth (BT) technology, and other technologies.

In an exemplary embodiment, the apparatus 300 may be implemented by one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital Signal Processing Devices (DSPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic elements for executing the methods described above.

In an exemplary embodiment, a non-transitory computer readable storage medium is also provided, such as memory 304, including instructions executable by processor 320 of apparatus 300 to perform the above-described method. For example, the non-transitory computer readable storage medium may be ROM, random Access Memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, etc.

It is understood that the term "plurality" in this disclosure means two or more, and other adjectives are similar thereto. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship. The singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It is further understood that the terms "first," "second," and the like are used to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish one type of information from another and do not denote a particular order or importance. Indeed, the expressions "first", "second", etc. may be used entirely interchangeably. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure.

It will be further understood that although operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains.

It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims

1.A cooling apparatus defrost control apparatus, comprising:

2. The apparatus of claim 1, wherein the apparatus further comprises:

and the first compensation circuit is used for compensating errors generated by output signals of the pressure sensor due to wind speed change when the fan gear of the cooling equipment is switched.

3. The apparatus of claim 2, wherein the device comprises a plurality of sensors,

The first compensation circuit comprises N first compensation branches, wherein N is a natural number;

4. The apparatus of claim 3, wherein the device comprises a plurality of sensors,

Each first compensation branch of the N first compensation branches corresponds to one gear of the cooling equipment fan, and the first compensation branches are connected in parallel;

5. The apparatus of claim 4, wherein the device comprises a plurality of sensors,

The resistance of the first voltage dividing resistor is in direct proportion to the wind speed corresponding to the working gear of the fan of the cooling equipment.

6. The apparatus according to any one of claims 1-5, wherein the apparatus further comprises:

7. The apparatus of claim 6, wherein the device comprises a plurality of sensors,

The second compensation circuit comprises a second compensation branch circuit and a third compensation branch circuit;

8. The apparatus of claim 7, wherein the device comprises a plurality of sensors,

When the cabinet door of the cooling equipment is opened, the second switch is turned on, and the third switch is turned off; and

9. The apparatus of claim 8, wherein the device comprises a plurality of sensors,

The resistance value of the second voltage dividing resistor is larger than that of the third voltage dividing resistor.

10. The apparatus of claim 8, wherein the device comprises a plurality of sensors,

After the cabinet door of the cooling device is closed by a first time threshold, the third switch is opened.

11. A defrosting control method of a cooling device, characterized by comprising:

12. The method of claim 11, wherein said inputting the output signal of the pressure sensor to the inverting input of the hysteresis comparison circuit comprises:

13. The method of claim 12, wherein the step of determining the position of the probe is performed,

The first compensation circuit comprises N first compensation branches, each first compensation branch is connected in parallel, and N is a natural number;

14. The method of any one of claims 11-13, wherein said inputting the output signal of the pressure sensor to the inverting input of a hysteresis comparison circuit comprises:

15. The method of claim 14, wherein the step of providing the first information comprises,

16. The method as recited in claim 15, further comprising:

And after the cabinet door of the cooling equipment is closed by a first time threshold, controlling the third switch to be opened.

17. A cooling apparatus defrost control apparatus, comprising:

18. The apparatus of claim 17, wherein said inputting the output signal of the pressure sensor to the inverting input of the hysteresis comparison circuit comprises:

19. The apparatus of claim 18, wherein the device comprises a plurality of sensors,

20. The apparatus of any one of claims 17-19, wherein the inputting the output signal of the pressure sensor to the inverting input of the hysteresis comparison circuit comprises:

21. The apparatus of claim 20, wherein the device comprises a plurality of sensors,

22. The apparatus as recited in claim 21, further comprising:

23. An electronic device, comprising:

A processor;

A memory for storing processor-executable instructions;

wherein the processor is configured to perform the method of any of claims 11-16.

24. A storage medium having instructions stored therein that, when executed by a processor of a cooling device, enable the cooling device to perform the method of any one of claims 11-16.