A control method and device of an air conditioning system, the air conditioning system and a storage medium

Abstract

This invention discloses a control method, device, air conditioning system, and storage medium for an air conditioning system. The method includes: after the air conditioning system is started, and upon determining that an electric auxiliary heating device needs to be activated, controlling two or more PTC heating elements to start in stages according to the voltage range of the driving voltage unit and the Curie temperatures of the two or more PTC heating elements, thereby achieving graded power control of the PTC unit. This solution, by using PTC heating elements with different Curie temperatures in the PTC auxiliary electric heater and performing graded power control on the PTC heating elements with different Curie temperatures, reduces the inrush current when the PTC unit starts, improves the safety of the PTC auxiliary electric heater, and is beneficial for energy saving.

Description

Technical Field

[0001] This invention belongs to the field of air conditioning system technology, specifically relating to a control method, device, air conditioning system and storage medium for an air conditioning system, and particularly to a graded power control device, air conditioning system and storage medium for a PTC unit in an electric auxiliary heating device of an air conditioning system. Background Technology

[0002] To improve user comfort, air conditioning systems can use a PTC (positive temperature coefficient thermistor) auxiliary electric heater after the system is turned on for heating. This helps to quickly adjust the indoor temperature to the user's set temperature.

[0003] The PTC auxiliary electric heater in an air conditioning system uses PTC material as its heating element. When the PTC auxiliary electric heater is turned on, there is an inrush current. If the PTC auxiliary electric heater contains multiple PTC heating elements (e.g., two or more), and these elements turn on simultaneously, the inrush current can become excessive, potentially affecting the safety of the PTC auxiliary electric heater and even the entire air conditioning system.

[0004] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a control method, device, air conditioning system, and storage medium for an air conditioning system. This addresses the problem that when multiple PTC heating elements in an air conditioning system's PTC auxiliary electric heater are simultaneously activated, the inrush current during PTC auxiliary electric heater activation can be excessive, affecting the safety of the PTC auxiliary electric heater and even the air conditioning system. The invention achieves this by using PTC heating elements with different Curie temperatures in the PTC auxiliary electric heater, implementing graded power control for these elements, reducing the inrush current during PTC unit activation, improving the safety of the PTC auxiliary electric heater, and contributing to energy savings.

[0006] This invention provides a control method for an air conditioning system, wherein the air conditioning system has an electric auxiliary heating device; the electric auxiliary heating device includes: a PTC unit and a driving voltage unit; the driving voltage unit is used to output a driving voltage to drive the PTC unit to work; the PTC unit includes: a PTC heating element, wherein the number of PTC heating elements is two or more, and the Curie temperatures of the two or more PTC heating elements are all different; the driving voltage has a voltage range, wherein the number of voltage ranges is two or more; the control method for the air conditioning system includes: after the air conditioning system is started, acquiring the target temperature of the air conditioning system; and acquiring the indoor ambient temperature of the room where the air conditioning system is located. The indoor ambient temperature of the air conditioning system is denoted as . It is determined whether the air conditioning system is operating in heating mode, defrosting mode, or has received a user's command to activate the electric auxiliary heating function. If not, the electric auxiliary heating device remains off. If so, it is determined whether the electric auxiliary heating device needs to be activated based on the indoor ambient temperature of the air conditioning system. If it is determined that the electric auxiliary heating device needs to be activated, the two or more PTC heating elements are controlled to start in stages according to the voltage range of the driving voltage unit and the Curie temperatures of the two or more PTC heating elements, thereby achieving graded power control of the PTC unit.

[0007] In some embodiments, determining whether the electric auxiliary heating device needs to be turned on based on the indoor ambient temperature of the air conditioning system includes: determining whether the indoor ambient temperature of the air conditioning system is less than or equal to the difference between the target temperature of the air conditioning system and a set temperature threshold; if the indoor ambient temperature of the air conditioning system is greater than the difference between the target temperature of the air conditioning system and the set temperature threshold, then it is determined that the electric auxiliary heating device does not need to be turned on, and the electric auxiliary heating device remains off; if the indoor ambient temperature of the air conditioning system is less than or equal to the difference between the target temperature of the air conditioning system and the set temperature threshold, then it is determined that the electric auxiliary heating device needs to be turned on.

[0008] In some embodiments, the two or more voltage ranges include: a first voltage range, a second voltage range to an nth voltage range, where n is a positive integer greater than or equal to 2, and the driving voltage of the nth voltage range increases as the value of n increases; the two or more PTC heating elements include: a first-stage PTC heating element, a second-stage PTC heating element to an mth-stage PTC heating element, where m is a positive integer greater than or equal to 2, and the Curie temperature of the mth-stage PTC heating element increases as the value of m increases; based on the voltage range to which the driving voltage of the driving voltage unit belongs and the Curie temperatures of the two or more PTC heating elements, the two or more PTC heating elements are controlled to start in stages to achieve graded power control of the PTC unit, including: controlling the driving voltage unit to start, controlling the driving voltage of the driving voltage unit to increase linearly in the first voltage range; and controlling the driving voltage of the driving voltage unit to start in stages. When the voltage increases linearly in the first voltage range, the first-stage PTC heating element, the second-stage PTC heating element, and the m-th stage PTC heating element are simultaneously activated. These first-stage, second-stage, and m-th stage PTC heating elements are referred to as the first group of PTC heating elements. During the linear increase of the driving voltage of the driving voltage unit in the first voltage range, the first group of PTC heating elements operates. Once the driving voltage of the driving voltage unit reaches the upper limit of the first voltage range, the driving voltage of the driving voltage unit is stabilized at the upper limit of the first voltage range. At this time, the PTC heating elements in the first group whose Curie temperature corresponds to a voltage value less than or equal to the upper limit of the first voltage range are controlled to be in a high-resistance state to stop operating, while the PTC heating elements in the first group whose Curie temperature corresponds to a voltage value greater than the upper limit of the first voltage range continue to operate.

[0009] In some embodiments, based on the voltage range to which the driving voltage of the driving voltage unit belongs and the Curie temperatures of the two or more PTC heating elements, the PTC heating elements are controlled to start in stages to achieve graded power control of the PTC unit. This further includes: after the driving voltage of the driving voltage unit stabilizes at the upper limit of the first voltage range for a first set time, controlling the driving voltage of the driving voltage unit to increase linearly in the second voltage range; designating the PTC heating elements in the first group whose Curie temperature corresponds to a voltage value greater than the upper limit of the first voltage range as the second group of PTC heating elements; controlling the second group of PTC heating elements to continue operating while controlling the driving voltage of the driving voltage unit to increase linearly in the second voltage range; after the driving voltage of the driving voltage unit increases to the upper limit of the second voltage range, controlling the driving voltage of the driving voltage unit to stabilize at the upper limit of the second voltage range; at this time, controlling the PTC heating elements in the second group whose Curie temperature corresponds to a voltage value less than or equal to the upper limit of the second voltage range to be in a high-resistance state to stop operating, and controlling the PTC heating elements in the second group whose Curie temperature corresponds to a voltage value greater than the upper limit of the second voltage range to continue operating.

[0010] In some embodiments, based on the voltage range to which the driving voltage of the driving voltage unit belongs and the Curie temperatures of the two or more PTC heating elements, the PTC heating elements are controlled to start in stages to achieve graded power control of the PTC unit. This further includes: after the driving voltage of the driving voltage unit stabilizes at the upper limit of the second voltage range for a second set time, controlling the driving voltage of the driving voltage unit to increase linearly in the third voltage range; designating the PTC heating elements in the second group whose Curie temperature-corresponding voltage value is greater than the upper limit of the second voltage range as the third group of PTC heating elements; controlling the third group of PTC heating elements to continue operating while controlling the driving voltage of the driving voltage unit to increase linearly in the third voltage range; and waiting for the driving voltage unit to start in stages. After the driving voltage increases to the upper limit of the third voltage range, the driving voltage of the driving voltage unit is stabilized at the upper limit of the third voltage range. At this time, the PTC heating elements in the third group of PTC heating elements whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the third voltage range are controlled to be in a high resistance state to stop working, and the PTC heating elements in the third group of PTC heating elements whose voltage value corresponding to the Curie temperature is greater than the upper limit of the third voltage range continue to work. This process continues until the driving voltage of the driving voltage unit increases to the upper limit of the nth voltage range, at which point the PTC heating elements whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the nth voltage range are controlled to be in a high resistance state to stop working, and the PTC heating elements whose voltage value corresponding to the Curie temperature is greater than the upper limit of the nth voltage range continue to work.

[0011] In some embodiments, based on the voltage range to which the driving voltage of the driving voltage unit belongs and the Curie temperatures of the two or more PTC heating elements, the PTC heating elements are controlled to start in stages to achieve graded power control of the PTC unit. This further includes: after the driving voltage of the driving voltage unit increases to the upper limit of the nth voltage range, controlling the driving voltage of the driving voltage unit to decrease linearly in the nth voltage range; designating the PTC heating elements whose voltage values ​​corresponding to their Curie temperatures are greater than the upper limit of the nth voltage range as the nth group of PTC heating elements; while controlling the driving voltage of the driving voltage unit to decrease linearly in the nth voltage range, controlling the PTC heating elements whose voltage values ​​corresponding to their Curie temperatures are greater than the upper limit of the nth voltage range to continue operating; and after the driving voltage of the driving voltage unit decreases to the upper limit of the (n-1)th voltage range, controlling the driving voltage of the driving voltage unit to stabilize at the upper limit of the (n-1)th voltage range.

[0012] In some embodiments, based on the voltage range to which the driving voltage of the driving voltage unit belongs and the Curie temperatures of the two or more PTC heating elements, the two or more PTC heating elements are controlled to start in stages to achieve staged power control of the PTC unit. This further includes: after the driving voltage of the driving voltage unit stabilizes at the upper limit of the (n-1)th voltage range for a third predetermined time, controlling the driving voltage of the driving voltage unit to decrease linearly in the (n-1)th voltage range; and after controlling the driving voltage of the driving voltage unit to begin decreasing linearly in the (n-1)th voltage range, controlling the voltage value corresponding to the Curie temperature to be less than or equal to the [previous setting]. PTC heating elements whose upper limit of voltage range n-1 and higher than the upper limit of voltage range n-2 recover from high resistance state; PTC heating elements whose Curie temperature-corresponding voltage value is higher than the upper limit of voltage range n-2 are denoted as the (n-1)th group of PTC heating elements; after the driving voltage of the control unit begins to decrease linearly in voltage range n-1, and the PTC heating elements whose Curie temperature-corresponding voltage value is less than or equal to the upper limit of voltage range n-1 and higher than the upper limit of voltage range n-2 recover from high resistance state, the (n-1)th group of PTC heating elements continues to operate; wait for the driving voltage... After the driving voltage of the pressure unit decreases to the upper limit of the (n-2)th voltage range, the driving voltage of the driving voltage unit is controlled to stabilize at the upper limit of the (n-2)th voltage range; after the driving voltage of the driving voltage unit stabilizes at the upper limit of the (n-2)th voltage range for a fourth set time, the driving voltage of the driving voltage unit is controlled to decrease linearly in the (n-2)th voltage range; after the driving voltage of the driving voltage unit begins to decrease linearly in the (n-2)th voltage range, the PTC heating element whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the (n-2)th voltage range and greater than the upper limit of the (n-3)th voltage range resumes operation from the high resistance state; PTC heating elements whose Curie temperature corresponds to a voltage value greater than the upper limit of the (n-3)th voltage range are designated as the (n-2)th group of PTC heating elements. After the driving voltage of the control unit begins to decrease linearly in the (n-2)th voltage range, PTC heating elements whose Curie temperature corresponds to a voltage value less than or equal to the upper limit of the (n-2)th voltage range and greater than the upper limit of the (n-3)th voltage range resume operation from a high-resistance state. The (n-2)th group of PTC heating elements continues to operate. This process continues until the driving voltage of the control unit decreases to the lower limit of the first voltage range, at which point all PTC heating elements are turned off.

[0013] In accordance with the above method, another aspect of the present invention provides a control device for an air conditioning system, wherein the air conditioning system has an electric auxiliary heating device; the electric auxiliary heating device includes: a PTC unit and a driving voltage unit; the driving voltage unit is used to output a driving voltage to drive the PTC unit to work; the PTC unit includes: a PTC heating element, wherein the number of PTC heating elements is two or more, and the Curie temperatures of the two or more PTC heating elements are all different; the driving voltage has a voltage range, wherein the number of voltage ranges is two or more; the control device for the air conditioning system includes: an acquisition unit configured to acquire the target temperature of the air conditioning system after the air conditioning system is started; and to acquire the indoor ambient temperature of the room where the air conditioning system is located, denoted as the room temperature of the air conditioning system. The control unit is configured to determine whether the air conditioning system is operating in heating mode, defrosting mode, or receiving a user's command to activate the electric auxiliary heating function. The control unit is further configured to keep the electric auxiliary heating device off if the conditions are not met. The control unit is also configured to determine whether the electric auxiliary heating device needs to be activated based on the indoor ambient temperature of the air conditioning system if the conditions are met. Furthermore, the control unit is configured to, when it is determined that the electric auxiliary heating device needs to be activated, control the staged activation of two or more PTC heating elements based on the voltage range of the driving voltage unit and the Curie temperatures of the two or more PTC heating elements, thereby achieving staged power control of the PTC unit.

[0014] In some embodiments, the control unit determines whether the electric auxiliary heating device needs to be turned on based on the indoor ambient temperature of the air conditioning system, including: determining whether the indoor ambient temperature of the air conditioning system is less than or equal to the difference between the target temperature of the air conditioning system and a set temperature threshold; if the indoor ambient temperature of the air conditioning system is greater than the difference between the target temperature of the air conditioning system and the set temperature threshold, then it is determined that the electric auxiliary heating device does not need to be turned on, and the electric auxiliary heating device remains off; if the indoor ambient temperature of the air conditioning system is less than or equal to the difference between the target temperature of the air conditioning system and the set temperature threshold, then it is determined that the electric auxiliary heating device needs to be turned on.

[0015] In some embodiments, the two or more voltage ranges include: a first voltage range, a second voltage range to an nth voltage range, where n is a positive integer greater than or equal to 2, and the driving voltage of the nth voltage range increases as the value of n increases; the two or more PTC heating elements include: a first-stage PTC heating element, a second-stage PTC heating element to an mth-stage PTC heating element, where m is a positive integer greater than or equal to 2, and the Curie temperature of the mth-stage PTC heating element increases as the value of m increases; the control unit controls the two or more PTC heating elements to start in stages according to the voltage range to which the driving voltage of the driving voltage unit belongs and the Curie temperatures of the two or more PTC heating elements, so as to achieve graded power control of the PTC unit, including: controlling the driving voltage unit to start, controlling the driving voltage of the driving voltage unit to increase linearly in the first voltage range; and controlling the driving voltage unit to start in stages. When the driving voltage of the driving voltage unit increases linearly in the first voltage range, the first-stage PTC heating element, the second-stage PTC heating element, and the m-th stage PTC heating element are simultaneously activated. The first-stage PTC heating element, the second-stage PTC heating element, and the m-th stage PTC heating element are referred to as the first group of PTC heating elements. During the process of the driving voltage of the driving voltage unit increasing linearly in the first voltage range, the first group of PTC heating elements operates. After the driving voltage of the driving voltage unit increases to the upper limit of the first voltage range, the driving voltage of the driving voltage unit is stabilized at the upper limit of the first voltage range. At this time, the PTC heating elements in the first group whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the first voltage range are controlled to be in a high-resistance state to stop working, while the PTC heating elements in the first group whose voltage value corresponding to the Curie temperature is greater than the upper limit of the first voltage range continue to work.

[0016] In some embodiments, the control unit controls two or more PTC heating elements to start in stages according to the voltage range to which the driving voltage of the driving voltage unit belongs and the Curie temperatures of the two or more PTC heating elements, so as to achieve graded power control of the PTC unit. The control unit further includes: after the driving voltage of the driving voltage unit stabilizes at the upper limit of the first voltage range for a first set time, controlling the driving voltage of the driving voltage unit to increase linearly in the second voltage range; and designating the PTC heating elements in the first group whose Curie temperature corresponds to a voltage value greater than the upper limit of the first voltage range as the second group of PTC heating elements. The system controls the second group of PTC heating elements to continue operating when the driving voltage of the driving voltage unit increases linearly in the second voltage range. After the driving voltage of the driving voltage unit increases to the upper limit of the second voltage range, the driving voltage of the driving voltage unit is stabilized at the upper limit of the second voltage range. At this time, the PTC heating elements in the second group of PTC heating elements whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the second voltage range are controlled to be in a high-resistance state to stop operating, and the PTC heating elements in the second group of PTC heating elements whose voltage value corresponding to the Curie temperature is greater than the upper limit of the second voltage range are controlled to continue operating.

[0017] In some embodiments, the control unit, based on the voltage range to which the driving voltage of the driving voltage unit belongs and the Curie temperatures of the two or more PTC heating elements, controls the staged activation of two or more PTC heating elements to achieve staged power control of the PTC unit. This further includes: after the driving voltage of the driving voltage unit stabilizes at the upper limit of the second voltage range for a second set time, controlling the driving voltage of the driving voltage unit to linearly increase in the third voltage range; designating PTC heating elements in the second group whose Curie temperature-corresponding voltage value is greater than the upper limit of the second voltage range as the third group of PTC heating elements; and controlling the third group of PTC heating elements to continue operating while controlling the driving voltage of the driving voltage unit to linearly increase in the third voltage range; waiting for the driving voltage to... After the driving voltage of the voltage unit increases to the upper limit of the third voltage range, the driving voltage of the driving voltage unit is stabilized at the upper limit of the third voltage range. At this time, the PTC heating elements in the third group of PTC heating elements whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the third voltage range are controlled to be in a high resistance state to stop working, and the PTC heating elements in the third group of PTC heating elements whose voltage value corresponding to the Curie temperature is greater than the upper limit of the third voltage range continue to work. This process continues until the driving voltage of the driving voltage unit increases to the upper limit of the nth voltage range, at which point the PTC heating elements whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the nth voltage range are controlled to be in a high resistance state to stop working, and the PTC heating elements whose voltage value corresponding to the Curie temperature is greater than the upper limit of the nth voltage range continue to work.

[0018] In some embodiments, the control unit controls two or more PTC heating elements to start in stages according to the voltage range to which the driving voltage of the driving voltage unit belongs and the Curie temperature of the two or more PTC heating elements, so as to realize the staged power control of the PTC unit. The control unit further includes: after the driving voltage of the driving voltage unit increases to the upper limit of the nth voltage range, controlling the driving voltage of the driving voltage unit to decrease linearly in the nth voltage range; designating PTC heating elements whose voltage value corresponding to the Curie temperature is greater than the upper limit of the nth voltage range as the nth group of PTC heating elements; while controlling the driving voltage of the driving voltage unit to decrease linearly in the nth voltage range, controlling the PTC heating elements whose voltage value corresponding to the Curie temperature is greater than the upper limit of the nth voltage range to continue working; and after the driving voltage of the driving voltage unit decreases to the upper limit of the (n-1)th voltage range, controlling the driving voltage of the driving voltage unit to stabilize at the upper limit of the (n-1)th voltage range.

[0019] In some embodiments, the control unit controls the staged activation of two or more PTC heating elements based on the voltage range to which the driving voltage of the driving voltage unit belongs and the Curie temperatures of the two or more PTC heating elements to achieve staged power control of the PTC unit. This further includes: after the driving voltage of the driving voltage unit stabilizes at the upper limit of the (n-1)th voltage range for a third predetermined time, controlling the driving voltage of the driving voltage unit to linearly decrease in the (n-1)th voltage range; and after controlling the driving voltage of the driving voltage unit to begin linearly decreasing in the (n-1)th voltage range, controlling the voltage value corresponding to the Curie temperature to be smaller. PTC heating elements whose voltage is equal to or greater than the upper limit of the (n-1)th voltage range and greater than the upper limit of the (n-2)th voltage range resume operation from a high-resistance state; PTC heating elements whose Curie temperature-corresponding voltage is greater than the upper limit of the (n-2)th voltage range are denoted as the (n-1)th group of PTC heating elements; after the driving voltage of the control unit begins to decrease linearly in the (n-1)th voltage range, and the PTC heating elements whose Curie temperature-corresponding voltage is less than or equal to the upper limit of the (n-1)th voltage range and greater than the upper limit of the (n-2)th voltage range resume operation from a high-resistance state, the (n-1)th group of PTC heating elements continues to operate; until the... After the driving voltage of the driving voltage unit decreases to the upper limit of the (n-2)th voltage range, the driving voltage of the driving voltage unit is stabilized at the upper limit of the (n-2)th voltage range. After the driving voltage of the driving voltage unit stabilizes at the upper limit of the (n-2)th voltage range for a fourth set time, the driving voltage of the driving voltage unit is linearly decreased in the (n-2)th voltage range. After the driving voltage of the driving voltage unit begins to linearly decrease in the (n-2)th voltage range, the PTC heating element whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the (n-2)th voltage range and greater than the upper limit of the (n-3)th voltage range is controlled to recover from the high resistance state. The process involves: designating PTC heating elements whose Curie temperature corresponds to a voltage value greater than the upper limit of the (n-3)th voltage range as the (n-2)th group of PTC heating elements; after the driving voltage of the control unit begins to decrease linearly in the (n-2)th voltage range, and the PTC heating elements whose Curie temperature corresponds to a voltage value less than or equal to the upper limit of the (n-2)th voltage range and greater than the upper limit of the (n-3)th voltage range resume operation from a high-resistance state, the (n-2)th group of PTC heating elements continues to operate; this process continues until the driving voltage of the control unit decreases to the lower limit of the first voltage range, at which point all PTC heating elements are turned off.

[0020] In conjunction with the above-described device, the present invention further provides an air conditioning system, comprising: the control device for the air conditioning system described above.

[0021] In conjunction with the above method, the present invention further provides a storage medium comprising a stored program, wherein, when the program is executed, the device on which the storage medium is located controls the execution of the control method of the air conditioning system described above.

[0022] Therefore, the solution of the present invention, for the electric auxiliary heating device of the air conditioning system, sets up a PTC unit and a driving voltage unit in the electric auxiliary heating device; sets up two or more PTC heating elements in the PTC unit, and the Curie temperatures of the two or more PTC heating elements are all different; after the air conditioning system is started and the electric auxiliary heating device of the air conditioning system is started, according to the voltage range of the driving voltage unit, the PTC heating elements in the PTC unit are controlled to work at the voltage values ​​corresponding to the Curie temperatures of the two or more PTC heating elements in the corresponding voltage range, and the corresponding PTC heating elements stop working when the voltage value corresponding to the Curie temperature of the PTC heating element is higher than the corresponding voltage range, thereby realizing graded power control of PTC heating elements with different Curie temperatures in the PTC unit; thus, by using PTC heating elements with different Curie temperatures in the PTC auxiliary electric heater, graded power control of PTC heating elements with different Curie temperatures is achieved, reducing the inrush current when the PTC unit is turned on, improving the safety of the PTC auxiliary electric heater, and contributing to energy saving.

[0023] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention.

[0024] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0025] Figure 1 This is a flowchart illustrating an embodiment of the control method for an air conditioning system according to the present invention;

[0026] Figure 2 This is a flowchart illustrating an embodiment of the method of the present invention for determining whether the electric auxiliary heating device needs to be turned on based on the indoor ambient temperature.

[0027] Figure 3 This is a flowchart illustrating an embodiment of the method of the present invention for controlling the graded activation of the first group of PTC heating elements;

[0028] Figure 4 This is a flowchart illustrating an embodiment of the method of the present invention for controlling the graded activation of the second group of PTC heating elements;

[0029] Figure 5 This is a flowchart illustrating an embodiment of the method of the present invention for controlling the graded activation of the nth group of PTC heating elements;

[0030] Figure 6 This is a flowchart illustrating an embodiment of the method of the present invention for controlling the restart of the nth group of PTC heating elements;

[0031] Figure 7 This is a flowchart illustrating an embodiment of the method of the present invention for controlling the restart of the (n-1)th group of PTC heating elements;

[0032] Figure 8 This is a schematic diagram of the structure of an embodiment of the control device for the air conditioning system of the present invention;

[0033] Figure 9 This is a schematic diagram of a structure of a PTC unit in an electric auxiliary heating device of an air conditioning system;

[0034] Figure 10 for Figure 9 A magnified schematic diagram of the local structure at point I;

[0035] Figure 11 This is a schematic diagram of another embodiment of the PTC unit in the electric auxiliary heating device of an air conditioning system;

[0036] Figure 12 for Figure 11 A partially enlarged schematic diagram;

[0037] Figure 13 for Figure 11 A magnified view of another part of the diagram;

[0038] Figure 14 A schematic flowchart of an embodiment of a graded power control method for a PTC unit in an electric auxiliary heating device of an air conditioning system;

[0039] Figure 15 This is a schematic diagram showing the curve of the driving voltage of the driving voltage unit in the electric auxiliary heating device of the air conditioning system changing over time.

[0040] Referring to the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0041] 3-Aluminum tube; 4-PTC heating element; 5-Ceramic plate; 6-Silicone; 7-Insulating film; 8-Electrode plate; 102-Acquisition unit; 104-Control unit. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0043] Considering that the PTC auxiliary electric heater in the air conditioning system uses PTC material as the heating element, i.e., the PTC heating element, it only needs to be turned on when the air conditioning system is heating and defrosting. It will not be turned on during other operating scenarios of the air conditioning system.

[0044] In PTC auxiliary electric heaters, PTC material is a temperature-sensitive conductive material. When the temperature of PTC material remains within a certain range, its resistivity remains essentially constant or changes only slightly. However, when the temperature of PTC material reaches its specific transition point temperature, its resistivity undergoes a sudden change within a narrow temperature range of a few or tens of degrees, causing the resistivity of PTC material to increase rapidly. 3 ~10 9 The specific transformation temperature of PTC material is called the Curie temperature.

[0045] The time taken for the dynamic characteristic current of a PTC heating element to change from the unstable stage to the stable stage is determined by the heat capacity, heat dissipation coefficient, and input voltage of the PTC heating element. The larger the heat capacity, heat dissipation coefficient, and input voltage of the PTC heating element, the shorter the time taken for the dynamic characteristic current of the PTC heating element to change from the unstable stage to the stable stage.

[0046] When the PTC auxiliary electric heater in an air conditioning system is turned on, there is an inrush current. If multiple PTC heating elements in the auxiliary electric heater are turned on simultaneously, the inrush current can become excessive, affecting the safety of the auxiliary electric heater and even the air conditioning system. This can impact the lifespan of other switching components and electrical safety within the system. For example, the control of the PTC heating elements in the auxiliary electric heater is achieved through relay control. If the inrush current is too large, it can cause the relay contacts to stick together. Relays used to control the PTC heating elements are typically electromagnetic relays. They control the magnetic flux by switching the relay coil on and off (the energized coil produces a magnetic effect), and then use electromagnetic force to attract the armature, thus opening and closing the relay contacts. If the relay contacts stick together, the relay's control over the PTC heating elements will fail, affecting the reliability of the PTC heating element control and consequently the safety of the PTC heating element and even the air conditioning system.

[0047] Furthermore, because PTC heating elements contain temperature control components such as temperature limiters and fuses, prolonged high-power operation can cause these components to fail, for example, due to aging, thus affecting the reliability of the PTC heating element. Therefore, PTC heating elements experience power attenuation during long-term operation. Frequent start-stop cycles and prolonged high-power operation can easily reduce the reliability of the PTC heating element, failing to achieve energy-saving effects and impacting heating comfort.

[0048] Therefore, the present invention provides a control method for an air conditioning system, specifically a graded power control of a PTC unit in an electric auxiliary heating device of an air conditioning system. The electric auxiliary heating device of the air conditioning system employs a PTC unit; within the PTC unit, two or more PTC heating elements are provided, each with a different Curie temperature; for the PTC heating elements with different Curie temperatures, graded power control is performed through different voltage drive ranges, which can reduce the inrush current when the PTC unit is turned on, improve the safety of the PTC auxiliary electric heater, and is beneficial for energy saving.

[0049] According to embodiments of the present invention, a control method for an air conditioning system is provided, such as... Figure 1The diagram shows a flowchart of an embodiment of the method of the present invention. The air conditioning system has an electric auxiliary heating device; the electric auxiliary heating device includes: a PTC unit and a driving voltage unit; the driving voltage unit is used to output a driving voltage to drive the PTC unit to work, such as driving at least one of two or more PTC heating elements to work; the PTC unit includes: a PTC heating element, the number of which is two or more, and the Curie temperatures of the two or more PTC heating elements are all different; the driving voltage has voltage ranges, the number of which is two or more; the operating voltage corresponding to the Curie temperature of each of the two or more PTC heating elements is less than or equal to the maximum upper limit of the two or more voltage ranges. Specifically, in the solution of the present invention, the electric auxiliary heating device of the air conditioning system mainly includes a PTC unit and a driving voltage unit, wherein the PTC unit is mainly composed of PTC heating elements, and PTC heating elements with different Curie temperatures are arranged on the PTC unit. Figure 9 This is a schematic diagram of the structure of a PTC unit in an electric auxiliary heating device of an air conditioning system. Figure 10 for Figure 9 A magnified schematic diagram of the structure at point I in the middle. Figure 9 and Figure 10 As shown in the example, the PTC unit includes a voltage input terminal and a PTC heating element.

[0050] in, Figure 9 A, B, C, D, and E represent PTC heating elements with different Curie temperatures, ranging from low to high. The PTC heating elements operate by applying a driving voltage input from the voltage input terminal via a driving voltage unit. The higher the driving voltage output from the driving voltage unit, the higher the heating power of the PTC heating element, and under the same conditions, the higher its temperature. As the operating time increases, the PTC heating element heats up and enters the positive temperature coefficient characteristic region. The resistance of the PTC heating element increases sharply, and the current decreases significantly, eventually reaching a steady state where the PTC heating element is in thermal equilibrium and its temperature remains stable.

[0051] Figure 11 This is a schematic diagram of another embodiment of the PTC unit in the electric auxiliary heating device of an air conditioning system. Figure 12 for Figure 11 A partially enlarged schematic diagram. Figure 13 for Figure 11 A magnified view of another part of the diagram. Figure 9 , Figure 10 , Figure 11 , Figure 12 and Figure 13 The PTC unit shown includes: an aluminum tube 3, a PTC heating element 4, a ceramic plate 5, a silicone rubber 6, an insulating film 7, and an electrode plate 8. The ceramic plate 5 is positioned close to the voltage input terminal. The aluminum tube 3, PTC heating element 4, silicone rubber 6, insulating film 7, and electrode plate 8 are positioned away from the voltage input terminal. The aluminum tube 3, insulating film 7, electrode plate 8, PTC heating element 4, and silicone rubber 6 are arranged in sequence.

[0052] Among them, aluminum tube 3 has a heat dissipation function; PTC heating element 4 has a heating function; ceramic plate 5 has the opposite function to PTC heating element 4, that is, ceramic plate 5 does not have a heating function, but ceramic plate 5 can transfer heat. After the PTC heating elements 4 with different Curie temperatures are arranged, a certain number of ceramic plates 5 are arranged at the tail of PTC heating element 4 to conduct the heat generated by PTC heating element 4 to the temperature limiter or fuse of PTC heating element 4; the temperature limiter and fuse of PTC heating element 4 are temperature protection devices, which are switching devices. When the temperature of PTC heating element 4 is higher than a certain value, the temperature limiter will open. When the temperature of PTC heating element 4 drops to a certain value, the temperature limiter will close again, which is a resettable device; when the temperature of PTC heating element 4 reaches an even higher value, the fuse will open. At this time, the fuse opening is irreversible and cannot be closed again. Generally, the temperature limiter and fuse are located near the voltage input terminal and are fixed near the voltage input terminal by certain fasteners. Silicone 6 is placed at the spot welding surface of the voltage input terminal. Silicone 6 serves as a seal to prevent moisture and other contaminants from affecting the interior of the PTC heating element 4. An insulating film 7 provides insulation, primarily located between the aluminum tube 3 and the electrode plate 8. The electrode plate 8 mainly serves to provide a certain voltage value to both sides of the PTC heating element 4. Figure 1 As shown, the control method of the air conditioning system includes steps S110 to S150.

[0053] In step S110, the electric auxiliary heating device is turned off before the air conditioning system is started; the electric auxiliary heating device is turned off by default after the air conditioning system is started; the target temperature of the air conditioning system is obtained; and the indoor ambient temperature of the room where the air conditioning system is located is obtained and recorded as the indoor ambient temperature of the air conditioning system. The target temperature of the air conditioning system is the user-set temperature.

[0054] In step S120, it is determined whether the air conditioning system is operating in heating mode, or in defrosting mode, or the air conditioning system receives a user's command to activate the electric auxiliary heating function.

[0055] If the condition is not met at step S130, the electric auxiliary heating device remains off.

[0056] In step S140, if the condition is met, it is determined whether the electric auxiliary heating device needs to be turned on based on the indoor ambient temperature of the air conditioning system.

[0057] In some embodiments, the specific process of determining whether the electric auxiliary heating device needs to be turned on based on the indoor ambient temperature of the air conditioning system in step S140 is illustrated in the following exemplary description.

[0058] The following is combined Figure 2 The schematic diagram shown is a flowchart of an embodiment of the method of the present invention for determining whether the electric auxiliary heating device needs to be turned on based on the indoor ambient temperature. It further illustrates the specific process of determining whether the electric auxiliary heating device needs to be turned on based on the indoor ambient temperature in step S140, including steps S210 to S230.

[0059] Step S210: Determine whether the indoor ambient temperature of the air conditioning system is less than or equal to the difference between the target temperature of the air conditioning system and a set temperature threshold. The set temperature threshold is, for example, temperature ΔT.

[0060] Step S220: If it is determined that the indoor ambient temperature of the air conditioning system is greater than the difference between the target temperature of the air conditioning system and the set temperature threshold, then it is determined that the electric auxiliary heating device does not need to be turned on, and the electric auxiliary heating device continues to be kept off.

[0061] Step S230: If it is determined that the indoor ambient temperature of the air conditioning system is less than or equal to the difference between the target temperature of the air conditioning system and the set temperature threshold, then it is determined that the electric auxiliary heating device needs to be turned on.

[0062] Specifically, Figure 14 This is a flowchart illustrating an embodiment of a graded power control method for a PTC unit in an electric auxiliary heating device of an air conditioning system. Figure 14 As shown, the graded power control method for the PTC unit in the electric auxiliary heating device of the air conditioning system includes:

[0063] Step 1: The PTC unit in the electric auxiliary heating device of the air conditioning system is off by default. After the air conditioning system is started, it is determined whether the air conditioning system receives the corresponding signal: if yes, proceed to Step 2; otherwise, keep the PTC unit in the electric auxiliary heating device off. This signal includes whether the air conditioning system is in heating mode or whether the user has activated the electric auxiliary heating function of the air conditioning system via remote control. That is, the determination of whether to activate the electric auxiliary heating function is only made when the air conditioning system is in heating mode or defrost mode.

[0064] Step 2: When the air conditioning system is in heating mode or the user has activated the electric auxiliary heating function of the air conditioning system via remote control, determine whether the indoor ambient temperature T of the air conditioning system is met. 室内环境温度 ≤User-set temperature T 设定温度 -Temperature ΔT: If yes, proceed to step 3; otherwise, keep the PTC unit in the electric auxiliary heating device of the air conditioning system off.

[0065] There are two main types of heating methods in air conditioning systems. One method primarily achieves heating capacity through heat exchange with the refrigerant, while the other utilizes a PTC heating element. However, heating with a PTC heating element is relatively inefficient and is used as an auxiliary heating method. The indoor unit of the air conditioning system is equipped with an ambient temperature sensor to detect the ambient temperature of the room where the air conditioning system is located, which serves as the indoor ambient temperature T. 室内环境温度 User-set temperature T 设定温度 This is the target ambient temperature set by the user after the air conditioning system is turned on. The temperature ΔT can be set to 3℃~4℃.

[0066] Step 3: If the indoor ambient temperature T of the air conditioning system is satisfied... 室内环境温度 ≤User-set temperature T 设定温度 If the temperature ΔT is reached, the PTC unit needs to be turned on and put into operation.

[0067] In step S150, when it is determined that the electric auxiliary heating device needs to be turned on, the two or more PTC heating elements are controlled to start in stages according to the voltage range to which the driving voltage of the driving voltage unit belongs and the Curie temperature of the two or more PTC heating elements, so as to realize the staged power control of the PTC unit.

[0068] This invention proposes a graded power control method for a PTC unit in an electric auxiliary heating device of an air conditioning system. The PTC unit comprises two or more PTC heating elements, arranged at intervals. These heating elements have different Curie temperatures. By using different voltage drive ranges, graded power control is implemented for the PTC heating elements at different Curie temperatures. This reduces the inrush current when the PTC unit starts up and when the heating elements are working, preventing damage to the PTC heating elements and related components due to excessive inrush current when two or more PTC heating elements start up simultaneously. This improves the safety of the PTC auxiliary electric heater. Furthermore, by allowing the PTC heating elements at different Curie temperatures to operate in a graded manner, the operating power of the PTC unit can be adjusted, which not only improves the heating efficiency of the PTC unit to enhance user comfort but also contributes to energy conservation. If the PTC unit cannot dissipate heat in time, the heating effect of the PTC unit will be poor. By adjusting the stage, the heat conduction of the PTC unit in working condition can be improved, so the heat can be conducted away and the heating efficiency of the PTC unit will be improved accordingly.

[0069] In some embodiments, the two or more voltage ranges include: a first voltage range, a second voltage range to an nth voltage range, that is, the first voltage range to the nth voltage range with the driving voltage increasing sequentially, where n is a positive integer greater than or equal to 2, and the driving voltage of the nth voltage range also increases as the value of n increases; the two or more PTC heating elements include: a first-stage PTC heating element, a second-stage PTC heating element to an mth-stage PTC heating element, that is, the first-stage PTC heating element, the second-stage PTC heating element to the mth-stage PTC heating element with the Curie temperature increasing sequentially, where m is a positive integer greater than or equal to 2, and the Curie temperature of the mth-stage PTC heating element also increases as the value of m increases.

[0070] Specifically, Figure 15 This is a schematic diagram showing the curve of the driving voltage of the driving voltage unit in the electric auxiliary heating device of an air conditioning system changing over time. Figure 15 As shown in the example, within a certain time region [0, t10], the driving voltage unit applies a linear voltage of a different voltage region under different time regions. Corresponding to the time region [0, t10], a voltage region [0, U3] is set.

[0071] For example, within the time region [0, t10], the following time regions are set sequentially as time progresses: [0, t1], [t1, t2], [t2, t3], [t3, t4], [t4, t5], [t5, t6], [t6, t7], [t7, t8], [t8, t9], and [t9, t10]. The endpoint values ​​of two adjacent time regions can belong to either the previous or the next time region.

[0072] Correspondingly, within the voltage region [0, U3], as the linear voltage increases, voltage regions [0, U1], [U1, U2], and [U2, U3] are set sequentially; wherein, the endpoint values ​​of two adjacent voltage regions in each voltage region can belong to the previous voltage region or the next voltage region. Figure 15 In the example shown, the slanted lines in each voltage range mainly represent the slope of linear power regulation, which can reduce the impact of inrush current and stabilize power regulation, while the horizontal lines mainly maintain stable power.

[0073] In the time region [0, t1], the driving voltage of the driving voltage unit changes from low to high within the voltage region [0, U1]. In the time region [t1, t2], the driving voltage of the driving voltage unit has risen to the upper limit of the voltage region [0, U1], i.e., voltage U1, and stabilizes at voltage U1. In the time region [t2, t3], the driving voltage of the driving voltage unit changes from low to high within the voltage region [U1, U2]. In the time region [t3, t4], the driving voltage of the driving voltage unit has risen to the upper limit of the voltage region [U1, U2], i.e., voltage U2, and stabilizes at voltage U2. In the time region [t4, t5], the driving voltage of the driving voltage unit changes from low to high within the voltage region [U2, U3]. In the time region [t5, t6], the driving voltage of the driving voltage unit changes from high to low within the voltage region [U3, U2]. In the time region [t6, t7], the driving voltage of the driving voltage unit has decreased to the lower limit of the voltage region [U3, U2], i.e., voltage U2, and stabilizes at voltage U2. In the time region [t7, t8], the driving voltage of the driving voltage unit changes from high to low within the voltage region [U2, U1]. In the time region [t8, t9], the driving voltage of the driving voltage unit has decreased to the lower limit of the voltage region [U2, U1], i.e., voltage U1, and stabilizes at voltage U1. In the time region [t9, t10], the driving voltage of the driving voltage unit changes from high to low within the voltage region [U1, 0].

[0074] In step S150, when it is determined that the electric auxiliary heating device needs to be turned on, the two or more PTC heating elements are controlled to start in stages according to the voltage range to which the driving voltage of the driving voltage unit belongs and the Curie temperature of the two or more PTC heating elements, so as to realize the staged power control of the PTC unit, including: the process of controlling the first group of PTC heating elements to start in stages.

[0075] The following is combined Figure 3 The flowchart shown is a schematic diagram of an embodiment of the method of the present invention for controlling the graded start-up of the first group of PTC heating elements. It further illustrates the specific process of controlling the graded start-up of the first group of PTC heating elements in step S150, including steps S310 to S340.

[0076] Step S310: When it is determined that the electric auxiliary heating device needs to be turned on, the driving voltage unit is started, and the driving voltage of the driving voltage unit is linearly increased in a first voltage range. The first voltage range is, for example, the voltage region [0, U1].

[0077] Step S320: When the driving voltage of the driving voltage unit is linearly increased in the first voltage range, the first-stage PTC heating element, the second-stage PTC heating element, and the m-th stage PTC heating element are simultaneously activated.

[0078] Step S330: The first-stage PTC heating element, the second-stage PTC heating element to the m-th stage PTC heating element are referred to as the first group of PTC heating elements; after the first group of PTC heating elements are started simultaneously, the first group of PTC heating elements work as the driving voltage of the driving voltage unit is linearly increased in the first voltage range.

[0079] Step S340: When the first group of PTC heating elements is working, after the driving voltage of the driving voltage unit increases to the upper limit of the first voltage range, the driving voltage of the driving voltage unit is controlled to stabilize at the upper limit of the first voltage range. At this time, the PTC heating elements in the first group of PTC heating elements whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the first voltage range are controlled to be in a high resistance state to stop working, and the PTC heating elements in the first group of PTC heating elements whose voltage value corresponding to the Curie temperature is greater than the upper limit of the first voltage range are controlled to continue working.

[0080] Specifically, such as Figure 14 As shown, the graded power control method for the PTC unit in the electric auxiliary heating device of the air conditioning system further includes: in step 3, if the indoor ambient temperature T of the air conditioning system is satisfied... 室内环境温度 ≤User-set temperature T 设定温度When the temperature reaches ΔT, the air conditioning system begins to adjust the drive voltage unit, such as adjusting the voltage value from 0 to U3, to control the PTC unit to turn on and operate. The drive voltage unit, based on the voltage division principle of resistors in the circuit and the Zener diode, enables the high-power transistor (or MOSFET) connected in series between the magnetic field coil and the power supply to turn on and off in a timely manner, achieving the purpose of automatically adjusting the output voltage. The voltage uses single-phase electrical control, generally household AC 220V.

[0081] The adjustment method of the air conditioning system's regulating drive voltage unit mainly involves controlling different voltage ranges. (See also...) Figure 15 In the example shown, the voltage values ​​U1, U2, and U3 are related to the Curie temperature of the PTC heating element. These voltage values ​​are primarily determined by the operating characteristic curves of the PTC heating element under certain conditions. These operating characteristic curves are mainly voltage versus temperature operating characteristic curves, obtained from experimental data. Furthermore, the voltage values ​​U1, U2, and U3 correspond to the Curie temperatures of different PTC heating elements. Figure 15 In the curve shown, assuming the time interval [0, t1], the voltage value starts to adjust linearly from [0, U1]. At this time, the PTC heating elements with different Curie temperatures represented by A, B, and C start to work. Because the voltage is low at this time and has not yet reached the voltage value corresponding to the Curie temperature of the PTC heating elements represented by A, B, and C, the PTC heating elements with different Curie temperatures represented by A, B, and C will start simultaneously. However, the heating power of the PTC heating elements with different Curie temperatures represented by A, B, and C is low, and the inrush current of the PTC heating elements with different Curie temperatures represented by A, B, and C is also relatively small.

[0082] See Figure 15 In the example shown, since the PTC heating elements with different Curie temperatures represented by A, B, and C have lower voltages when they start working, and the Curie temperatures of the PTC heating elements represented by B and C are higher than those represented by A, the inrush current of the PTC heating elements represented by B and C is relatively smaller. When the PTC heating elements with different Curie temperatures represented by A, B, and C start working, and the voltage of the driving voltage unit exceeds voltage U1 (i.e., enters the voltage range [U1, U2]), since the voltage value of U1 reaches the voltage value corresponding to the Curie temperature of the PTC heating element represented by A, the PTC heating element represented by A is in a high-resistance state and stops working. The PTC heating elements represented by B and C are in a high-power operating state, and the current of the PTC heating elements represented by B and C increases.

[0083] In some embodiments, in step S150, when it is determined that the electric auxiliary heating device needs to be turned on, the two or more PTC heating elements are controlled to start in stages according to the voltage range to which the driving voltage of the driving voltage unit belongs and the Curie temperature of the two or more PTC heating elements, so as to realize the staged power control of the PTC unit. It also includes the process of controlling the second group of PTC heating elements to start in stages as the driving voltage of the driving voltage unit increases.

[0084] The following is combined Figure 4 The flowchart shown is a schematic diagram of an embodiment of the method of the present invention for controlling the graded start-up of the second group of PTC heating elements. It further illustrates the specific process of controlling the graded start-up of the second group of PTC heating elements in step S150, including steps S410 to S430.

[0085] Step S410: After the driving voltage of the driving voltage unit stabilizes at the upper limit of the first voltage range for a first set time, the driving voltage of the driving voltage unit is controlled to increase linearly in the second voltage range.

[0086] Step S420: The PTC heating elements in the first group of PTC heating elements whose voltage value corresponding to the Curie temperature is greater than the upper limit of the first voltage range are recorded as the second group of PTC heating elements; while controlling the driving voltage of the driving voltage unit to increase linearly in the second voltage range, the second group of PTC heating elements is controlled to continue to work.

[0087] Step S430: While controlling the second group of PTC heating elements to continue working, after the driving voltage of the driving voltage unit increases to the upper limit of the second voltage range, the driving voltage of the driving voltage unit is controlled to stabilize at the upper limit of the second voltage range. At this time, the PTC heating elements in the second group of PTC heating elements whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the second voltage range are controlled to be in a high resistance state to stop working, and the PTC heating elements in the second group of PTC heating elements whose voltage value corresponding to the Curie temperature is greater than the upper limit of the second voltage range are controlled to continue working.

[0088] See Figure 15In the example shown, since the PTC heating elements with different Curie temperatures represented by A, B, and C have lower voltages when they start working, and the Curie temperatures of the PTC heating elements represented by B and C are higher than those represented by A, the inrush current of the PTC heating elements represented by B and C is relatively smaller. When the PTC heating elements with different Curie temperatures represented by A, B, and C start working, and the voltage of the driving voltage unit exceeds voltage U1 (i.e., enters the voltage range [U1, U2]), since the voltage value of U1 reaches the voltage value corresponding to the Curie temperature of the PTC heating element represented by A, the PTC heating element represented by A is in a high-resistance state and stops working. The PTC heating elements represented by B and C are in a high-power operating state, and the current of the PTC heating elements represented by B and C increases. When the current of the PTC heating elements with different Curie temperatures represented by B and C increases, and the voltage of the driving voltage unit reaches the voltage range [U2, U3], the PTC heating elements with different Curie temperatures represented by B are in a high-resistance state and stop working, while the PTC heating elements with different Curie temperatures represented by C are in a high-power operation state, thereby realizing graded power control.

[0089] In some embodiments, in step S150, when it is determined that the electric auxiliary heating device needs to be turned on, the two or more PTC heating elements are controlled to start in stages according to the voltage range to which the driving voltage of the driving voltage unit belongs and the Curie temperature of the two or more PTC heating elements, so as to realize the staged power control of the PTC unit. It also includes the process of controlling the nth group of PTC heating elements to start in stages as the driving voltage of the driving voltage unit increases.

[0090] The following is combined Figure 5 The flowchart shown is a schematic diagram of an embodiment of the method of the present invention for controlling the graded start-up of the nth group of PTC heating elements. It further illustrates the specific process of controlling the graded start-up of the nth group of PTC heating elements in step S150, including steps S510 to S540.

[0091] Step S510: After the driving voltage of the driving voltage unit stabilizes at the upper limit of the second voltage range for a second set time, the driving voltage of the driving voltage unit is controlled to increase linearly in the third voltage range.

[0092] In step S520, the PTC heating elements in the second group whose Curie temperature-corresponding voltage value is greater than the upper limit of the second voltage range are designated as the third group of PTC heating elements; while controlling the driving voltage of the driving voltage unit to increase linearly in the third voltage range, the third group of PTC heating elements is controlled to continue working.

[0093] Step S530: While controlling the third group of PTC heating elements to continue working, after the driving voltage of the driving voltage unit increases to the upper limit of the third voltage range, the driving voltage of the driving voltage unit is controlled to stabilize at the upper limit of the third voltage range. At this time, the PTC heating elements in the third group of PTC heating elements whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the third voltage range are controlled to be in a high resistance state to stop working, and the PTC heating elements in the third group of PTC heating elements whose voltage value corresponding to the Curie temperature is greater than the upper limit of the third voltage range are controlled to continue working.

[0094] Step S540, and so on, until the driving voltage of the driving voltage unit increases to the upper limit of the nth voltage range, the PTC heating element whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the nth voltage range is controlled to be in a high resistance state to stop working, and the PTC heating element whose voltage value corresponding to the Curie temperature is greater than the upper limit of the nth voltage range continues to work.

[0095] See Figure 15 In the example shown, since the PTC heating elements with different Curie temperatures represented by A, B, and C have lower voltages when they start working, and the Curie temperatures of the PTC heating elements represented by B and C are higher than those represented by A, the inrush current of the PTC heating elements represented by B and C is relatively smaller. When the PTC heating elements with different Curie temperatures represented by A, B, and C start working, and the voltage of the driving voltage unit exceeds voltage U1 (i.e., enters the voltage range [U1, U2]), since the voltage value of U1 reaches the voltage value corresponding to the Curie temperature of the PTC heating element represented by A, the PTC heating element represented by A is in a high-resistance state and stops working. The PTC heating elements represented by B and C are in a high-power operating state, and the current of the PTC heating elements represented by B and C increases. When the current of the PTC heating elements with different Curie temperatures, represented by B and C, increases, and the voltage of the driving voltage unit reaches the voltage range [U2, U3], the PTC heating element with different Curie temperatures represented by B is in a high-resistance state and stops working, while the PTC heating element with different Curie temperatures represented by C is in a high-power operating state, thus achieving graded power control. Similarly, when the voltage of the driving voltage unit is higher, it is necessary to activate PTC heating elements with higher Curie temperatures, such as those represented by D and E, while the PTC heating element with different Curie temperatures represented by C is in a high-resistance state and stops working.

[0096] When the PTC unit first starts working, the voltage of the driving voltage unit is relatively low. Therefore, it's impossible for only the PTC heating elements at different Curie temperatures (represented by A) to operate. The PTC heating elements at the corresponding Curie temperatures will only stop operating when the voltage of the driving voltage unit is higher than the voltage value corresponding to that Curie temperature. Furthermore, if only the PTC heating elements at different Curie temperatures (represented by A) operate at high power while other PTC heating elements (represented by B and C) shut down, the voltage of the PTC heating elements at the corresponding Curie temperatures (represented by A) will suddenly become high. This will cause a large inrush current in the PTC unit, damaging the other PTC heating elements (represented by B and C).

[0097] In some embodiments, in step S150, when it is determined that the electric auxiliary heating device needs to be turned on, the two or more PTC heating elements are controlled to start in stages according to the voltage range to which the driving voltage of the driving voltage unit belongs and the Curie temperature of the two or more PTC heating elements, so as to realize the staged power control of the PTC unit. It also includes the process of controlling the nth group of PTC heating elements to resume starting during the process of the driving voltage of the driving voltage unit decreasing.

[0098] The following is combined Figure 6 The flowchart shown is a schematic diagram of an embodiment of the method of the present invention for controlling the restart of the nth group of PTC heating elements. It further illustrates the specific process of controlling the restart of the nth group of PTC heating elements in step S150, including steps S610 to S630.

[0099] In step S610, after the driving voltage of the driving voltage unit increases to the upper limit of the nth voltage range, the PTC heating element whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the nth voltage range is controlled to be in a high resistance state to stop working, and the PTC heating element whose voltage value corresponding to the Curie temperature is greater than the upper limit of the nth voltage range continues to work, the driving voltage of the driving voltage unit is controlled to decrease linearly in the nth voltage range. Specifically, the driving voltage of the driving voltage unit is controlled to decrease linearly from the nth voltage range in the opposite way to the increase.

[0100] Step S620: PTC heating elements whose voltage value corresponding to the Curie temperature is greater than the upper limit of the nth voltage range are denoted as the nth group of PTC heating elements; while controlling the driving voltage of the driving voltage unit to decrease linearly in the nth voltage range, the PTC heating elements whose voltage value corresponding to the Curie temperature is greater than the upper limit of the nth voltage range continue to work.

[0101] Step S630: While controlling the nth group of PTC heating elements to continue working, after the driving voltage of the driving voltage unit is reduced to the upper limit of the (n-1)th voltage range, the driving voltage of the driving voltage unit is controlled to stabilize at the upper limit of the (n-1)th voltage range.

[0102] See Figure 15 In the example shown, the driving voltage of the control driving voltage unit is decreased in the opposite direction to the increase of the driving voltage of the control driving voltage unit. During the linear decrease of the driving voltage of the control driving voltage unit within the corresponding voltage range, after the driving voltage of the control driving voltage unit decreases to the upper limit of the corresponding voltage range, the driving voltage of the control driving voltage unit is stabilized at the upper limit of the corresponding voltage range. At this time, the PTC heating element, whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the corresponding voltage range, resumes operation from the high-resistivity state.

[0103] In some embodiments, in step S150, when it is determined that the electric auxiliary heating device needs to be turned on, the two or more PTC heating elements are controlled to start in stages according to the voltage range to which the driving voltage of the driving voltage unit belongs and the Curie temperature of the two or more PTC heating elements, so as to realize the staged power control of the PTC unit. It also includes the process of controlling the (n-1)th group of PTC heating elements to resume starting during the process of the driving voltage of the driving voltage unit decreasing.

[0104] The following is combined Figure 7 The flowchart shown is a schematic diagram of an embodiment of the method of the present invention for controlling the restart of the (n-1)th group of PTC heating elements. It further illustrates the specific process of controlling the restart of the (n-1)th group of PTC heating elements in step S150, including steps S710 to S760.

[0105] Step S710: After the driving voltage of the driving voltage unit stabilizes at the upper limit of the (n-1)th voltage range for a third set time, the driving voltage of the driving voltage unit is controlled to decrease linearly in the (n-1)th voltage range; after the driving voltage of the driving voltage unit starts to decrease linearly in the (n-1)th voltage range, the PTC heating element whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the (n-1)th voltage range and greater than the upper limit of the (n-2)th voltage range is controlled to resume operation from the high resistance state.

[0106] Step S720: PTC heating elements whose voltage value corresponding to Curie temperature is greater than the upper limit of the (n-2)th voltage range are denoted as the (n-1)th group of PTC heating elements; after the driving voltage of the control driving voltage unit starts to decrease linearly in the (n-1)th voltage range, and the PTC heating elements whose voltage value corresponding to Curie temperature is less than or equal to the upper limit of the (n-1)th voltage range and greater than the upper limit of the (n-2)th voltage range recover from the high resistance state, the (n-1)th group of PTC heating elements is controlled to continue working.

[0107] Step S730: While controlling the (n-1)th group of PTC heating elements to continue working, after the driving voltage of the driving voltage unit is reduced to the upper limit of the (n-2)th voltage range, the driving voltage of the driving voltage unit is controlled to stabilize at the upper limit of the (n-2)th voltage range.

[0108] Step S740: After the driving voltage of the driving voltage unit stabilizes at the upper limit of the (n-2)th voltage range for a fourth set time, the driving voltage of the driving voltage unit is controlled to decrease linearly in the (n-2)th voltage range; after the driving voltage of the driving voltage unit starts to decrease linearly in the (n-2)th voltage range, the PTC heating element whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the (n-2)th voltage range and greater than the upper limit of the (n-3)th voltage range resumes operation from the high resistance state.

[0109] Step S750: PTC heating elements whose voltage value corresponding to Curie temperature is greater than the upper limit of the (n-3)th voltage range are denoted as the (n-2)th group of PTC heating elements; after the driving voltage of the control driving voltage unit starts to decrease linearly in the (n-2)th voltage range, and the PTC heating elements whose voltage value corresponding to Curie temperature is less than or equal to the upper limit of the (n-2)th voltage range and greater than the upper limit of the (n-3)th voltage range recover from the high resistance state, the (n-2)th group of PTC heating elements continues to work.

[0110] Step S760, and so on, until the driving voltage of the driving voltage unit is reduced to the upper limit of the first voltage range, the PTC heating element whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the first voltage range is controlled to resume operation from the high resistance state; until the driving voltage of the driving voltage unit is reduced to the lower limit of the first voltage range, all PTC heating elements are controlled to turn off.

[0111] See Figure 15 In the example shown, during the process of decreasing the drive voltage of the control drive voltage unit in the opposite direction to the direction of increasing the drive voltage of the control drive voltage unit, when the drive voltage of the control drive voltage unit decreases to 0, all PTC heating elements are controlled to turn off.

[0112] In this way, within different voltage ranges, some PTC heating elements operate while others cease operation. This is primarily achieved through graded power control based on the driving voltage and Curie temperature. Simultaneously, the magnitude of the inrush current is controlled to prevent excessive inrush current from damaging the PTC heating elements themselves, as well as control components such as relays. This reduces inrush current, improves safety, and also contributes to enhanced energy efficiency.

[0113] The technical solution of this embodiment involves setting up a PTC unit and a driving voltage unit in the electric auxiliary heating device of an air conditioning system. The PTC unit contains two or more PTC heating elements, each with a different Curie temperature. When the air conditioning system and its electric auxiliary heating device are started, the driving voltage unit controls the PTC heating elements within the corresponding voltage range based on the voltage value corresponding to their Curie temperature. The PTC heating elements stop working when the voltage value corresponding to their Curie temperature exceeds the corresponding voltage range, thus achieving graded power control of the PTC heating elements with different Curie temperatures within the PTC unit. Therefore, by using PTC heating elements with different Curie temperatures in the PTC auxiliary electric heater, graded power control is achieved, reducing the inrush current when the PTC unit starts, improving the safety of the PTC auxiliary electric heater, and contributing to energy saving.

[0114] According to an embodiment of the present invention, a control device for an air conditioning system corresponding to a control method for an air conditioning system is also provided. See also Figure 8 The diagram shows a structural schematic of an embodiment of the device of the present invention. The air conditioning system has an electric auxiliary heating device; the electric auxiliary heating device includes: a PTC unit and a driving voltage unit; the driving voltage unit is used to output a driving voltage to drive the PTC unit to work, such as driving at least one of two or more PTC heating elements to work; the PTC unit includes: a PTC heating element, the number of PTC heating elements is two or more, and the Curie temperatures of the two or more PTC heating elements are all different; the driving voltage has voltage ranges, the number of voltage ranges is two or more; the operating voltage corresponding to the Curie temperature of each of the two or more PTC heating elements is less than or equal to the maximum upper limit of the two or more voltage ranges; specifically, in the solution of the present invention, the electric auxiliary heating device of the air conditioning system mainly includes a PTC unit and a driving voltage unit, wherein the PTC unit is mainly composed of PTC heating elements, and PTC heating elements with different Curie temperatures are arranged on the PTC unit. Figure 9 This is a schematic diagram of the structure of a PTC unit in an electric auxiliary heating device of an air conditioning system. Figure 10 for Figure 9 A magnified schematic diagram of the structure at point I in the middle. Figure 9 and Figure 10 As shown in the example, the PTC unit includes a voltage input terminal and a PTC heating element.

[0115] in, Figure 9 A, B, C, D, and E represent PTC heating elements with different Curie temperatures, ranging from low to high. The PTC heating elements operate by applying a driving voltage input from the voltage input terminal via a driving voltage unit. The higher the driving voltage output from the driving voltage unit, the higher the heating power of the PTC heating element, and under the same conditions, the higher its temperature. As the operating time increases, the PTC heating element heats up and enters the positive temperature coefficient characteristic region. The resistance of the PTC heating element increases sharply, and the current decreases significantly, eventually reaching a steady state where the PTC heating element is in thermal equilibrium and its temperature remains stable.

[0116] Figure 9 and Figure 10 The PTC unit shown includes: aluminum tube 3, PTC heating element 4, ceramic plate 5, silicone 6, insulating film 7, and electrode plate 8.

[0117] Among them, aluminum tube 3 has a heat dissipation function; PTC heating element 4 has a heating function; ceramic plate 5 has the opposite function to PTC heating element 4, that is, ceramic plate 5 does not have a heating function, but ceramic plate 5 can transfer heat. After the PTC heating elements 4 with different Curie temperatures are arranged, a certain number of ceramic plates 5 are arranged at the tail of PTC heating element 4 to conduct the heat generated by PTC heating element 4 to the temperature limiter or fuse of PTC heating element 4; the temperature limiter and fuse of PTC heating element 4 are temperature protection devices, which are switching devices. When the temperature of PTC heating element 4 is higher than a certain value, the temperature limiter will open. When the temperature of PTC heating element 4 drops to a certain value, the temperature limiter will close again, which is a resettable device; when the temperature of PTC heating element 4 reaches an even higher value, the fuse will open. At this time, the fuse opening is irreversible and cannot be closed again. Generally, the temperature limiter and fuse are located near the voltage input terminal and are fixed near the voltage input terminal by certain fasteners. Silicone 6 is placed at the spot welding surface of the voltage input terminal. Silicone 6 serves as a seal to prevent moisture and other contaminants from affecting the interior of the PTC heating element 4. An insulating film 7 provides insulation, primarily located between the aluminum tube 3 and the electrode plate 8. The electrode plate 8 mainly serves to provide a certain voltage value to both sides of the PTC heating element 4. Figure 8 As shown, the control device of the air conditioning system includes: an acquisition unit 102 and a control unit 104.

[0118] The acquisition unit 102 is configured to: turn off the electric auxiliary heating device before the air conditioning system is started; turn off the electric auxiliary heating device by default after the air conditioning system is started; acquire the target temperature of the air conditioning system; and acquire the indoor ambient temperature of the room where the air conditioning system is located, denoted as the indoor ambient temperature of the air conditioning system. The target temperature of the air conditioning system is the user-set temperature. For the specific functions and processing of the acquisition unit 102, please refer to step S110.

[0119] The control unit 104 is configured to determine whether the air conditioning system is operating in heating mode, defrosting mode, or whether the air conditioning system has received a user's command to activate the electric auxiliary heating function. The specific functions and processing of the control unit 104 are described in step S120.

[0120] The control unit 104 is also configured to keep the electric auxiliary heating device off if the condition is not met. The specific functions and processing of the control unit 104 are further described in step S130.

[0121] The control unit 104 is further configured to determine whether the electric auxiliary heating device needs to be activated based on the indoor ambient temperature of the air conditioning system if the condition is met. The specific functions and processing of the control unit 104 are further described in step S140.

[0122] In some embodiments, the control unit 104 determines whether the electric auxiliary heating device needs to be turned on based on the indoor ambient temperature of the air conditioning system, including:

[0123] The control unit 104 is further configured to determine whether the indoor ambient temperature of the air conditioning system is less than or equal to the difference between the target temperature of the air conditioning system and a set temperature threshold. The set temperature threshold is, for example, temperature ΔT. The specific functions and processing of the control unit 104 are further described in step S210.

[0124] The control unit 104 is further configured to, if it is determined that the indoor ambient temperature of the air conditioning system is greater than the difference between the target temperature and the set temperature threshold of the air conditioning system, then determine that the electric auxiliary heating device does not need to be turned on, and continue to keep the electric auxiliary heating device off. The specific functions and processing of this control unit 104 are further described in step S220.

[0125] The control unit 104 is further configured to determine that the electric auxiliary heating device needs to be activated if the indoor ambient temperature of the air conditioning system is determined to be less than or equal to the difference between the target temperature of the air conditioning system and a set temperature threshold. The specific functions and processing of the control unit 104 are further described in step S230.

[0126] Specifically, Figure 14 This is a flowchart illustrating an embodiment of a graded power control method for a PTC unit in an electric auxiliary heating device of an air conditioning system. Figure 14 As shown, the graded power control method for the PTC unit in the electric auxiliary heating device of the air conditioning system includes:

[0127] Step 1: The PTC unit in the electric auxiliary heating device of the air conditioning system is off by default. After the air conditioning system is started, it is determined whether the air conditioning system receives the corresponding signal: if yes, proceed to Step 2; otherwise, keep the PTC unit in the electric auxiliary heating device off. This signal includes whether the air conditioning system is in heating mode or whether the user has activated the electric auxiliary heating function of the air conditioning system via remote control. That is, the determination of whether to activate the electric auxiliary heating function is only made when the air conditioning system is in heating mode or defrost mode.

[0128] Step 2: When the air conditioning system is in heating mode or the user has activated the electric auxiliary heating function of the air conditioning system via remote control, determine whether the indoor ambient temperature T of the air conditioning system is met. 室内环境温度 ≤User-set temperature T设定温度 -Temperature ΔT: If yes, proceed to step 3; otherwise, keep the PTC unit in the electric auxiliary heating device of the air conditioning system off.

[0129] There are two main types of heating methods in air conditioning systems. One method primarily achieves heating capacity through heat exchange with the refrigerant, while the other utilizes a PTC heating element. However, heating with a PTC heating element is relatively inefficient and is used as an auxiliary heating method. The indoor unit of the air conditioning system is equipped with an ambient temperature sensor to detect the ambient temperature of the room where the air conditioning system is located, which serves as the indoor ambient temperature T. 室内环境温度 User-set temperature T 设定温度 This is the target ambient temperature set by the user after the air conditioning system is turned on. The temperature ΔT can be set to 3℃~4℃.

[0130] Step 3: If the indoor ambient temperature T of the air conditioning system is satisfied... 室内环境温度 ≤User-set temperature T 设定温度 If the temperature ΔT is reached, the PTC unit needs to be turned on and put into operation.

[0131] The control unit 104 is further configured to, when it is determined that the electric auxiliary heating device needs to be activated, control the staged activation of two or more PTC heating elements based on the voltage range of the driving voltage unit and the Curie temperature of the two or more PTC heating elements, so as to achieve staged power control of the PTC unit. The specific functions and processing of this control unit 104 are further described in step S150.

[0132] This invention proposes a graded power control method for a PTC unit in an electric auxiliary heating device of an air conditioning system. The PTC unit comprises two or more PTC heating elements, arranged at intervals. These heating elements have different Curie temperatures. By using different voltage drive ranges, graded power control is implemented for the PTC heating elements at different Curie temperatures. This reduces the inrush current when the PTC unit starts up and when the heating elements are working, preventing damage to the PTC heating elements and related components due to excessive inrush current when two or more PTC heating elements start up simultaneously. This improves the safety of the PTC auxiliary electric heater. Furthermore, by allowing the PTC heating elements at different Curie temperatures to operate in a graded manner, the operating power of the PTC unit can be adjusted, which not only improves the heating efficiency of the PTC unit to enhance user comfort but also contributes to energy conservation.

[0133] In some embodiments, the two or more voltage ranges include: a first voltage range, a second voltage range to an nth voltage range, that is, the first voltage range to the nth voltage range with the driving voltage increasing sequentially, where n is a positive integer greater than or equal to 2, and the driving voltage of the nth voltage range also increases as the value of n increases; the two or more PTC heating elements include: a first-stage PTC heating element, a second-stage PTC heating element to an mth-stage PTC heating element, that is, the first-stage PTC heating element, the second-stage PTC heating element to the mth-stage PTC heating element with the Curie temperature increasing sequentially, where m is a positive integer greater than or equal to 2, and the Curie temperature of the mth-stage PTC heating element also increases as the value of m increases.

[0134] Specifically, Figure 15 This is a schematic diagram showing the curve of the driving voltage of the driving voltage unit in the electric auxiliary heating device of an air conditioning system changing over time. Figure 15 As shown in the example, within a certain time region [0, t10], the driving voltage unit applies a linear voltage of a different voltage region under different time regions. Corresponding to the time region [0, t10], a voltage region [0, U3] is set.

[0135] For example, within the time region [0, t10], the following time regions are set sequentially as time progresses: [0, t1], [t1, t2], [t2, t3], [t3, t4], [t4, t5], [t5, t6], [t6, t7], [t7, t8], [t8, t9], and [t9, t10]. The endpoint values ​​of two adjacent time regions can belong to either the previous or the next time region.

[0136] Correspondingly, within the voltage region [0, U3], as the linear voltage increases, voltage regions [0, U1], [U1, U2], and [U2, U3] are set sequentially; wherein, the endpoint values ​​of two adjacent voltage regions in each voltage region can belong to the previous voltage region or the next voltage region. Figure 15 In the example shown, the slanted lines in each voltage range mainly represent the slope of linear power regulation, which can reduce the impact of inrush current and stabilize power regulation, while the horizontal lines mainly maintain stable power.

[0137] In the time region [0, t1], the driving voltage of the driving voltage unit changes from low to high within the voltage region [0, U1]. In the time region [t1, t2], the driving voltage of the driving voltage unit has risen to the upper limit of the voltage region [0, U1], i.e., voltage U1, and stabilizes at voltage U1. In the time region [t2, t3], the driving voltage of the driving voltage unit changes from low to high within the voltage region [U1, U2]. In the time region [t3, t4], the driving voltage of the driving voltage unit has risen to the upper limit of the voltage region [U1, U2], i.e., voltage U2, and stabilizes at voltage U2. In the time region [t4, t5], the driving voltage of the driving voltage unit changes from low to high within the voltage region [U2, U3]. In the time region [t5, t6], the driving voltage of the driving voltage unit changes from high to low within the voltage region [U3, U2]. In the time region [t6, t7], the driving voltage of the driving voltage unit has decreased to the lower limit of the voltage region [U3, U2], i.e., voltage U2, and stabilizes at voltage U2. In the time region [t7, t8], the driving voltage of the driving voltage unit changes from high to low within the voltage region [U2, U1]. In the time region [t8, t9], the driving voltage of the driving voltage unit has decreased to the lower limit of the voltage region [U2, U1], i.e., voltage U1, and stabilizes at voltage U1. In the time region [t9, t10], the driving voltage of the driving voltage unit changes from high to low within the voltage region [U1, 0].

[0138] When the control unit 104 determines that the electric auxiliary heating device needs to be activated, it controls two or more PTC heating elements to start in stages according to the voltage range of the driving voltage unit and the Curie temperature of the two or more PTC heating elements, so as to realize the staged power control of the PTC unit. This includes the process of controlling the staged activation of the first group of PTC heating elements, as follows:

[0139] The control unit 104 is further configured to, when it is determined that the electric auxiliary heating device needs to be activated, control the drive voltage unit to start, and control the drive voltage of the drive voltage unit to increase linearly in a first voltage range. The first voltage range is, for example, the voltage region [0, U1]. The specific functions and processing of the control unit 104 are further described in step S310.

[0140] The control unit 104 is further configured to simultaneously activate the first-stage PTC heating element, the second-stage PTC heating element, and the m-th stage PTC heating element when the driving voltage of the control driving voltage unit increases linearly in the first voltage range. The specific functions and processing of this control unit 104 are further described in step S320.

[0141] The control unit 104 is further configured to refer to the first-stage PTC heating element, the second-stage PTC heating element, and the m-th stage PTC heating element as a first group of PTC heating elements; after the first group of PTC heating elements are started simultaneously, the first group of PTC heating elements operates as the driving voltage of the driving voltage unit increases linearly in the first voltage range. The specific functions and processing of the control unit 104 are further described in step S330.

[0142] Specifically, the control unit 104 is further configured to, when the first group of PTC heating elements is operating, after the driving voltage of the driving voltage unit increases to the upper limit of the first voltage range, control the driving voltage of the driving voltage unit to stabilize at the upper limit of the first voltage range; at this time, control the PTC heating elements in the first group whose Curie temperature-corresponding voltage value is less than or equal to the upper limit of the first voltage range to be in a high-resistance state to stop operating, and control the PTC heating elements in the first group whose Curie temperature-corresponding voltage value is greater than the upper limit of the first voltage range to continue operating. The specific functions and processing of this control unit 104 are further described in step S340.

[0143] Specifically, such as Figure 14 As shown, the graded power control method for the PTC unit in the electric auxiliary heating device of the air conditioning system further includes: in step 3, if the indoor ambient temperature T of the air conditioning system is satisfied... 室内环境温度 ≤User-set temperature T 设定温度 When the temperature reaches ΔT, the air conditioning system begins to adjust the drive voltage unit to control the PTC unit to turn on and operate.

[0144] The adjustment method of the air conditioning system's regulating drive voltage unit mainly involves controlling different voltage ranges. (See also...) Figure 15 In the example shown, the voltage values ​​U1, U2, and U3 are related to the Curie temperature of the PTC heating element. These voltage values ​​are primarily determined by the operating characteristic curves of the PTC heating element under certain conditions. These operating characteristic curves are mainly voltage versus temperature operating characteristic curves, obtained from experimental data. Furthermore, the voltage values ​​U1, U2, and U3 correspond to the Curie temperatures of different PTC heating elements. Figure 15In the curve shown, assuming the time interval [0, t1], the voltage value starts to adjust linearly from [0, U1]. At this time, the PTC heating elements with different Curie temperatures represented by A, B, and C start to work. Because the voltage is low at this time and has not yet reached the voltage value corresponding to the Curie temperature of the PTC heating elements represented by A, B, and C, the PTC heating elements with different Curie temperatures represented by A, B, and C will start simultaneously. However, the heating power of the PTC heating elements with different Curie temperatures represented by A, B, and C is low, and the inrush current of the PTC heating elements with different Curie temperatures represented by A, B, and C is also relatively small.

[0145] See Figure 15 In the example shown, since the PTC heating elements with different Curie temperatures represented by A, B, and C have lower voltages when they start working, and the Curie temperatures of the PTC heating elements represented by B and C are higher than those represented by A, the inrush current of the PTC heating elements represented by B and C is relatively smaller. When the PTC heating elements with different Curie temperatures represented by A, B, and C start working, and the voltage of the driving voltage unit exceeds voltage U1 (i.e., enters the voltage range [U1, U2]), since the voltage value of U1 reaches the voltage value corresponding to the Curie temperature of the PTC heating element represented by A, the PTC heating element represented by A is in a high-resistance state and stops working. The PTC heating elements represented by B and C are in a high-power operating state, and the current of the PTC heating elements represented by B and C increases.

[0146] In some embodiments, when the control unit 104 determines that the electric auxiliary heating device needs to be activated, it controls two or more PTC heating elements to start in stages according to the voltage range of the driving voltage unit and the Curie temperature of the two or more PTC heating elements, so as to achieve staged power control of the PTC unit. The control unit also includes controlling the staged activation of a second group of PTC heating elements as the driving voltage of the driving voltage unit increases, as detailed below:

[0147] The control unit 104 is further configured to control the driving voltage of the driving voltage unit to increase linearly in the second voltage range after the driving voltage of the driving voltage unit stabilizes at the upper limit of the first voltage range for a first set time. The specific functions and processing of the control unit 104 are further described in step S410.

[0148] The control unit 104 is further configured to designate PTC heating elements in the first group whose Curie temperature-corresponding voltage value is greater than the upper limit of the first voltage range as the second group of PTC heating elements; and to control the second group of PTC heating elements to continue working when the driving voltage of the control driving voltage unit increases linearly in the second voltage range. The specific functions and processing of this control unit 104 are further described in step S420.

[0149] The control unit 104 is further configured to, while controlling the second group of PTC heating elements to continue operating, after the driving voltage of the driving voltage unit increases to the upper limit of the second voltage range, stabilize the driving voltage of the driving voltage unit at the upper limit of the second voltage range; at this time, control the PTC heating elements in the second group whose Curie temperature-corresponding voltage value is less than or equal to the upper limit of the second voltage range to be in a high-resistance state to stop operating, and control the PTC heating elements in the second group whose Curie temperature-corresponding voltage value is greater than the upper limit of the second voltage range to continue operating. The specific functions and processing of this control unit 104 are further described in step S430.

[0150] See Figure 15 In the example shown, since the PTC heating elements with different Curie temperatures represented by A, B, and C have lower voltages when they start working, and the Curie temperatures of the PTC heating elements represented by B and C are higher than those represented by A, the inrush current of the PTC heating elements represented by B and C is relatively smaller. When the PTC heating elements with different Curie temperatures represented by A, B, and C start working, and the voltage of the driving voltage unit exceeds voltage U1 (i.e., enters the voltage range [U1, U2]), since the voltage value of U1 reaches the voltage value corresponding to the Curie temperature of the PTC heating element represented by A, the PTC heating element represented by A is in a high-resistance state and stops working. The PTC heating elements represented by B and C are in a high-power operating state, and the current of the PTC heating elements represented by B and C increases. When the current of the PTC heating elements with different Curie temperatures represented by B and C increases, and the voltage of the driving voltage unit reaches the voltage range [U2, U3], the PTC heating elements with different Curie temperatures represented by B are in a high-resistance state and stop working, while the PTC heating elements with different Curie temperatures represented by C are in a high-power operation state, thereby realizing graded power control.

[0151] In some embodiments, when the control unit 104 determines that the electric auxiliary heating device needs to be activated, it controls two or more PTC heating elements to start in stages according to the voltage range of the driving voltage unit and the Curie temperature of the two or more PTC heating elements, so as to achieve staged power control of the PTC unit. The control unit also includes controlling the staged activation of the nth group of PTC heating elements as the driving voltage of the driving voltage unit increases, as detailed below:

[0152] The control unit 104 is further configured to control the driving voltage of the driving voltage unit to increase linearly in the third voltage range after the driving voltage of the driving voltage unit stabilizes at the upper limit of the second voltage range for a second set time. The specific functions and processing of the control unit 104 are further described in step S510.

[0153] The control unit 104 is further configured to designate PTC heating elements in the second group whose Curie temperature-corresponding voltage value is greater than the upper limit of the second voltage range as the third group of PTC heating elements; and to control the third group of PTC heating elements to continue working when the driving voltage of the control voltage unit increases linearly in the third voltage range. The specific functions and processing of this control unit 104 are further described in step S520.

[0154] The control unit 104 is further configured to, while controlling the third group of PTC heating elements to continue operating, after the driving voltage of the driving voltage unit increases to the upper limit of the third voltage range, stabilize the driving voltage of the driving voltage unit at the upper limit of the third voltage range; at this time, control the PTC heating elements in the third group whose Curie temperature-corresponding voltage value is less than or equal to the upper limit of the third voltage range to be in a high-resistance state to stop operating, and control the PTC heating elements in the third group whose Curie temperature-corresponding voltage value is greater than the upper limit of the third voltage range to continue operating. The specific functions and processing of this control unit 104 are further described in step S530.

[0155] The control unit 104 is further configured to, in a similar manner, control the PTC heating elements whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the nth voltage range to be in a high-resistance state to stop working, and control the PTC heating elements whose voltage value corresponding to the Curie temperature is greater than the upper limit of the nth voltage range to continue working, until the driving voltage of the driving voltage unit increases to the upper limit of the nth voltage range. The specific functions and processing of this control unit 104 are further described in step S540.

[0156] See Figure 15In the example shown, since the PTC heating elements with different Curie temperatures represented by A, B, and C have lower voltages when they start working, and the Curie temperatures of the PTC heating elements represented by B and C are higher than those represented by A, the inrush current of the PTC heating elements represented by B and C is relatively smaller. When the PTC heating elements with different Curie temperatures represented by A, B, and C start working, and the voltage of the driving voltage unit exceeds voltage U1 (i.e., enters the voltage range [U1, U2]), since the voltage value of U1 reaches the voltage value corresponding to the Curie temperature of the PTC heating element represented by A, the PTC heating element represented by A is in a high-resistance state and stops working. The PTC heating elements represented by B and C are in a high-power operating state, and the current of the PTC heating elements represented by B and C increases. When the current of the PTC heating elements with different Curie temperatures, represented by B and C, increases, and the voltage of the driving voltage unit reaches the voltage range [U2, U3], the PTC heating element with different Curie temperatures represented by B is in a high-resistance state and stops working, while the PTC heating element with different Curie temperatures represented by C is in a high-power operating state, thus achieving graded power control. Similarly, when the voltage of the driving voltage unit is higher, it is necessary to activate PTC heating elements with higher Curie temperatures, such as those represented by D and E, while the PTC heating element with different Curie temperatures represented by C is in a high-resistance state and stops working.

[0157] When the PTC unit first starts working, the voltage of the driving voltage unit is relatively low. Therefore, it's impossible for only the PTC heating elements at different Curie temperatures (represented by A) to operate. The PTC heating elements at the corresponding Curie temperatures will only stop operating when the voltage of the driving voltage unit is higher than the voltage value corresponding to that Curie temperature. Furthermore, if only the PTC heating elements at different Curie temperatures (represented by A) operate at high power while other PTC heating elements (represented by B and C) shut down, the voltage of the PTC heating elements at the corresponding Curie temperatures (represented by A) will suddenly become high. This will cause a large inrush current in the PTC unit, damaging the other PTC heating elements (represented by B and C).

[0158] In some embodiments, when the control unit 104 determines that the electric auxiliary heating device needs to be activated, it controls two or more PTC heating elements to start in stages according to the voltage range of the driving voltage unit and the Curie temperature of the two or more PTC heating elements, so as to achieve staged power control of the PTC unit. The control unit also includes controlling the nth group of PTC heating elements to resume startup during the process of decreasing the driving voltage of the driving voltage unit, as detailed below:

[0159] The control unit 104 is further configured to, after the driving voltage of the driving voltage unit increases to the upper limit of the nth voltage range, control the PTC heating element whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the nth voltage range to be in a high-resistance state to stop working, and control the PTC heating element whose voltage value corresponding to the Curie temperature is greater than the upper limit of the nth voltage range to continue working, while controlling the driving voltage of the driving voltage unit to decrease linearly in the nth voltage range, specifically controlling the driving voltage of the driving voltage unit to decrease linearly from the nth voltage range in the opposite manner to the increase. The specific functions and processing of this control unit 104 are further described in step S610.

[0160] The control unit 104 is further configured to designate PTC heating elements whose voltage value corresponding to the Curie temperature is greater than the upper limit of the nth voltage range as the nth group of PTC heating elements; and to control the PTC heating elements whose voltage value corresponding to the Curie temperature is greater than the upper limit of the nth voltage range to continue working when the driving voltage of the control driving voltage unit decreases linearly in the nth voltage range. The specific functions and processing of this control unit 104 are further described in step S620.

[0161] The control unit 104 is further configured to, while controlling the nth group of PTC heating elements to continue operating, stabilize the driving voltage of the driving voltage unit at the upper limit of the (n-1)th voltage range after the driving voltage of the driving voltage unit decreases to the upper limit of the (n-1)th voltage range. The specific functions and processing of this control unit 104 are further described in step S630.

[0162] See Figure 15 In the example shown, the driving voltage of the control driving voltage unit is decreased in the opposite direction to the increase of the driving voltage of the control driving voltage unit. During the linear decrease of the driving voltage of the control driving voltage unit within the corresponding voltage range, after the driving voltage of the control driving voltage unit decreases to the upper limit of the corresponding voltage range, the driving voltage of the control driving voltage unit is stabilized at the upper limit of the corresponding voltage range. At this time, the PTC heating element, whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the corresponding voltage range, resumes operation from the high-resistivity state.

[0163] In some embodiments, when the control unit 104 determines that the electric auxiliary heating device needs to be activated, it controls two or more PTC heating elements to start in stages according to the voltage range of the driving voltage of the driving voltage unit and the Curie temperature of the two or more PTC heating elements, so as to achieve staged power control of the PTC unit. The control unit also includes: controlling the (n-1)th group of PTC heating elements to resume startup during the process of decreasing the driving voltage of the driving voltage unit, as detailed below:

[0164] The control unit 104 is further configured to, after the driving voltage of the driving voltage unit stabilizes at the upper limit of the (n-1)th voltage range for a third predetermined time, control the driving voltage of the driving voltage unit to linearly decrease in the (n-1)th voltage range; and after controlling the driving voltage of the driving voltage unit to begin linearly decreasing in the (n-1)th voltage range, control the PTC heating element whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the (n-1)th voltage range and greater than the upper limit of the (n-2)th voltage range to resume operation from the high-resistivity state. The specific functions and processing of this control unit 104 are further described in step S710.

[0165] The control unit 104 is further configured to designate PTC heating elements whose voltage value corresponding to the Curie temperature is greater than the upper limit of the (n-2)th voltage range as the (n-1)th group of PTC heating elements; after the driving voltage of the control driving voltage unit begins to decrease linearly in the (n-1)th voltage range, and the PTC heating elements whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the (n-1)th voltage range and greater than the upper limit of the (n-2)th voltage range resume operation from the high resistance state, the (n-1)th group of PTC heating elements is controlled to continue operating. The specific functions and processing of this control unit 104 are further described in step S720.

[0166] The control unit 104 is further configured to, while controlling the (n-1)th group of PTC heating elements to continue operating, stabilize the driving voltage of the driving voltage unit at the upper limit of the (n-2)th voltage range after the driving voltage of the driving voltage unit decreases to the upper limit of the (n-2)th voltage range. The specific functions and processing of this control unit 104 are further described in step S730.

[0167] The control unit 104 is further configured to, after the driving voltage of the driving voltage unit stabilizes at the upper limit of the (n-2)th voltage range for a fourth predetermined time, control the driving voltage of the driving voltage unit to linearly decrease in the (n-2)th voltage range; and after controlling the driving voltage of the driving voltage unit to begin linearly decreasing in the (n-2)th voltage range, control the PTC heating element whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the (n-2)th voltage range and greater than the upper limit of the (n-3)th voltage range to resume operation from the high-resistivity state. The specific functions and processing of this control unit 104 are further described in step S740.

[0168] The control unit 104 is further configured to designate PTC heating elements whose Curie temperature-corresponding voltage value is greater than the upper limit of the (n-3)th voltage range as the (n-2)th group of PTC heating elements; after the driving voltage of the control driving voltage unit begins to decrease linearly in the (n-2)th voltage range, and the PTC heating elements whose Curie temperature-corresponding voltage value is less than or equal to the upper limit of the (n-2)th voltage range and greater than the upper limit of the (n-3)th voltage range resume operation from a high-resistance state, the control unit 104 controls the (n-2)th group of PTC heating elements to continue operating. The specific functions and processing of this control unit 104 are further described in step S750.

[0169] The control unit 104 is further configured to, in a similar manner, control the PTC heating elements whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the first voltage range to resume operation from a high-resistance state after the driving voltage of the driving voltage unit decreases to the upper limit of the first voltage range; and control all PTC heating elements to shut down after the driving voltage of the driving voltage unit decreases to the lower limit of the first voltage range. The specific functions and processing of this control unit 104 are further described in step S760.

[0170] See Figure 15 In the example shown, during the process of decreasing the drive voltage of the control drive voltage unit in the opposite direction to the direction of increasing the drive voltage of the control drive voltage unit, when the drive voltage of the control drive voltage unit decreases to 0, all PTC heating elements are controlled to turn off.

[0171] In this way, within different voltage ranges, some PTC heating elements operate while others cease operation. This is primarily achieved through graded power control based on the driving voltage and Curie temperature. Simultaneously, the magnitude of the inrush current is controlled to prevent excessive inrush current from damaging the PTC heating elements themselves, as well as control components such as relays. This reduces inrush current, improves safety, and also contributes to enhanced energy efficiency.

[0172] Since the processing and functions implemented by the device in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in the description of this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0173] The technical solution of this invention involves an electric auxiliary heating device for an air conditioning system, in which a PTC unit and a driving voltage unit are installed. The PTC unit contains two or more PTC heating elements, each with a different Curie temperature. When the air conditioning system and its electric auxiliary heating device are activated, the driving voltage unit controls the PTC heating elements within the corresponding voltage range based on the voltage value corresponding to their Curie temperature. The PTC heating elements stop working when the voltage value corresponding to their Curie temperature exceeds the corresponding voltage range. This achieves graded power control of the PTC heating elements with different Curie temperatures within the PTC unit, reducing inrush current and preventing damage to the PTC heating elements themselves and control components such as relays due to excessive inrush current. This improves safety and energy efficiency.

[0174] According to an embodiment of the present invention, an air conditioning system corresponding to a control device for an air conditioning system is also provided. This air conditioning system may include the control device for the air conditioning system described above.

[0175] Since the processing and functions implemented by the air conditioning system in this embodiment are basically the same as those of the aforementioned device embodiments, principles and examples, any details not covered in this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0176] The technical solution of this invention involves an electric auxiliary heating device for an air conditioning system, in which a PTC unit and a driving voltage unit are installed. The PTC unit contains two or more PTC heating elements, each with a different Curie temperature. When the air conditioning system is started and the electric auxiliary heating device is activated, the voltage value corresponding to the Curie temperature of each PTC heating element in the PTC unit is controlled according to the voltage range of the driving voltage unit. The PTC heating elements operate within their respective voltage ranges until the voltage value corresponding to their Curie temperature exceeds the corresponding voltage range, at which point the corresponding PTC heating element stops operating. This achieves graded power control of the PTC heating elements with different Curie temperatures within the PTC unit. By allowing the PTC heating elements with different Curie temperatures to operate in a graded manner, the operating power of the PTC unit can be adjusted, which not only improves the heating efficiency of the PTC unit to enhance user comfort but also contributes to energy conservation.

[0177] According to an embodiment of the present invention, a storage medium corresponding to a control method for an air conditioning system is also provided. The storage medium includes a stored program, wherein the program controls the device where the storage medium is located to execute the control method for the air conditioning system described above when it is executed.

[0178] Since the processing and functions implemented by the storage medium in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0179] The technical solution of this invention addresses the issue of a PTC unit and a driving voltage unit within an electric auxiliary heating device for an air conditioning system. The PTC unit contains two or more PTC heating elements, each with a different Curie temperature. When the air conditioning system and its electric auxiliary heating device are activated, the driving voltage unit controls the voltage values ​​corresponding to the Curie temperatures of the two or more PTC heating elements within the PTC unit. The PTC heating elements operate within their respective voltage ranges until the voltage value corresponding to their Curie temperature exceeds the corresponding voltage range, at which point the corresponding PTC heating element stops operating. This achieves graded power control of the PTC heating elements with different Curie temperatures within the PTC unit. This reduces the inrush current when the PTC unit is activated and the inrush current when the PTC heating elements are operating, preventing excessive inrush current that could damage the PTC heating elements and related components when two or more PTC heating elements are activated simultaneously. This enhances the safety of the PTC auxiliary electric heater.

[0180] In summary, it is readily understood by those skilled in the art that, without conflict, the aforementioned advantageous methods can be freely combined and superimposed.

[0181] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A control method for an air conditioning system, characterized in that, The air conditioning system has an electric auxiliary heating device; The electric auxiliary heating device includes: a PTC unit and a driving voltage unit; the driving voltage unit is used to output a driving voltage to drive the PTC unit to work; the PTC unit includes: two or more PTC heating elements, and the Curie temperatures of the two or more PTC heating elements are different; the driving voltage has voltage ranges, and the number of voltage ranges is two or more; the control method of the air conditioning system includes: After the air conditioning system is started, the target temperature of the air conditioning system is obtained; and the indoor ambient temperature of the room where the air conditioning system is located is obtained and recorded as the indoor ambient temperature of the air conditioning system. Determine whether the air conditioning system is operating in heating mode, or in defrosting mode, or the air conditioning system has received a user's command to activate the electric auxiliary heating function. If the conditions are not met, the electric auxiliary heating device shall remain off. If the conditions are met, then determine whether the electric auxiliary heating device needs to be turned on based on the indoor ambient temperature of the air conditioning system. When it is determined that the electric auxiliary heating device needs to be turned on, the two or more PTC heating elements are controlled to start in stages according to the voltage range of the driving voltage of the driving voltage unit and the Curie temperature of the two or more PTC heating elements, so as to realize the staged power control of the PTC unit. The voltage value is linearly adjusted starting from [0, U1]. At this time, the PTC heating elements with different Curie temperatures represented by A, B, and C start working. When the voltage of the driving voltage unit enters the voltage range [U1, U2], the PTC heating elements with different Curie temperatures represented by A are in a high-resistance state and stop working, while the PTC heating elements with different Curie temperatures represented by B and C are in a high-power operation state. When the voltage of the driving voltage unit reaches the voltage range [U2, U3], the PTC heating elements with different Curie temperatures represented by B are in a high-resistance state and stop working, while the PTC heating elements with different Curie temperatures represented by C are in a high-power operation state, thus realizing graded power control.

2. The control method for the air conditioning system according to claim 1, characterized in that, Determining whether the electric auxiliary heating device needs to be turned on based on the indoor ambient temperature of the air conditioning system includes: Determine whether the indoor ambient temperature of the air conditioning system is less than or equal to the difference between the target temperature of the air conditioning system and the set temperature threshold. If it is determined that the indoor ambient temperature of the air conditioning system is greater than the difference between the target temperature and the set temperature threshold of the air conditioning system, then it is determined that the electric auxiliary heating device does not need to be turned on, and the electric auxiliary heating device continues to be turned off. If it is determined that the indoor ambient temperature of the air conditioning system is less than or equal to the difference between the target temperature of the air conditioning system and the set temperature threshold, then it is determined that the electric auxiliary heating device needs to be turned on.

3. The control method for the air conditioning system according to claim 1 or 2, characterized in that, The two or more voltage ranges include: a first voltage range, a second voltage range to an nth voltage range, where n is a positive integer greater than or equal to 2, and the driving voltage of the nth voltage range increases as the value of n increases; the two or more PTC heating elements include: a first-stage PTC heating element, a second-stage PTC heating element to an mth-stage PTC heating element, where m is a positive integer greater than or equal to 2, and the Curie temperature of the mth-stage PTC heating element increases as the value of m increases. Based on the voltage range of the driving voltage unit and the Curie temperatures of the two or more PTC heating elements, the two or more PTC heating elements are controlled to start in stages to achieve graded power control of the PTC unit, including: The driving voltage unit is controlled to start, and the driving voltage of the driving voltage unit is controlled to increase linearly in the first voltage range; When the driving voltage of the control driving voltage unit increases linearly in the first voltage range, the first-stage PTC heating element, the second-stage PTC heating element, and the m-th stage PTC heating element are simultaneously activated. The first-stage PTC heating element, the second-stage PTC heating element, and the m-th stage PTC heating element are referred to as the first group of PTC heating elements; the first group of PTC heating elements works as the driving voltage of the control driving voltage unit increases linearly in the first voltage range. After the driving voltage of the driving voltage unit increases to the upper limit of the first voltage range, the driving voltage of the driving voltage unit is controlled to stabilize at the upper limit of the first voltage range. At this time, the PTC heating elements in the first group of PTC heating elements whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the first voltage range are controlled to be in a high resistance state to stop working, and the PTC heating elements in the first group of PTC heating elements whose voltage value corresponding to the Curie temperature is greater than the upper limit of the first voltage range are controlled to continue working.

4. The control method for the air conditioning system according to claim 3, characterized in that, Based on the voltage range of the driving voltage unit and the Curie temperatures of the two or more PTC heating elements, the system controls the staged activation of the two or more PTC heating elements to achieve staged power control of the PTC unit, and further includes: After the driving voltage of the driving voltage unit stabilizes at the upper limit of the first voltage range for a first set time, the driving voltage of the driving voltage unit is controlled to increase linearly in the second voltage range. The PTC heating elements in the first group whose Curie temperature voltage value is greater than the upper limit of the first voltage range are designated as the second group of PTC heating elements; when the driving voltage of the driving voltage unit is linearly increased in the second voltage range, the second group of PTC heating elements is controlled to continue to work. After the driving voltage of the driving voltage unit increases to the upper limit of the second voltage range, the driving voltage of the driving voltage unit is controlled to stabilize at the upper limit of the second voltage range. At this time, the PTC heating elements in the second group of PTC heating elements whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the second voltage range are controlled to be in a high resistance state to stop working, and the PTC heating elements in the second group of PTC heating elements whose voltage value corresponding to the Curie temperature is greater than the upper limit of the second voltage range are controlled to continue working.

5. The control method for the air conditioning system according to claim 4, characterized in that, Based on the voltage range of the driving voltage unit and the Curie temperatures of the two or more PTC heating elements, the system controls the staged activation of the two or more PTC heating elements to achieve staged power control of the PTC unit, and further includes: After the driving voltage of the driving voltage unit stabilizes at the upper limit of the second voltage range for a second set time, the driving voltage of the driving voltage unit is controlled to increase linearly in the third voltage range. The PTC heating elements in the second group whose Curie temperature corresponds to a voltage value greater than the upper limit of the second voltage range are designated as the third group of PTC heating elements; the third group of PTC heating elements continues to operate when the driving voltage of the driving voltage unit is linearly increased in the third voltage range. After the driving voltage of the driving voltage unit increases to the upper limit of the third voltage range, the driving voltage of the driving voltage unit is controlled to stabilize at the upper limit of the third voltage range. At this time, the PTC heating elements in the third group of PTC heating elements whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the third voltage range are controlled to be in a high resistance state to stop working, and the PTC heating elements in the third group of PTC heating elements whose voltage value corresponding to the Curie temperature is greater than the upper limit of the third voltage range are controlled to continue working. This process continues until the driving voltage of the driving voltage unit increases to the upper limit of the nth voltage range. Then, the PTC heating element whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the nth voltage range is controlled to be in a high resistance state to stop working, while the PTC heating element whose voltage value corresponding to the Curie temperature is greater than the upper limit of the nth voltage range continues to work.

6. The control method for an air conditioning system according to claim 5, characterized in that, Based on the voltage range of the driving voltage unit and the Curie temperatures of the two or more PTC heating elements, the system controls the staged activation of the two or more PTC heating elements to achieve staged power control of the PTC unit, and further includes: After the driving voltage of the driving voltage unit is increased to the upper limit of the nth voltage range, the driving voltage of the driving voltage unit is controlled to decrease linearly in the nth voltage range. PTC heating elements whose voltage value corresponding to Curie temperature is greater than the upper limit of the nth voltage range are denoted as the nth group of PTC heating elements; when the driving voltage of the driving voltage unit is linearly reduced in the nth voltage range, the PTC heating elements whose voltage value corresponding to Curie temperature is greater than the upper limit of the nth voltage range continue to work. After the driving voltage of the driving voltage unit is reduced to the upper limit of the (n-1)th voltage range, the driving voltage of the driving voltage unit is controlled to stabilize at the upper limit of the (n-1)th voltage range.

7. The control method for an air conditioning system according to claim 6, characterized in that, Based on the voltage range of the driving voltage unit and the Curie temperatures of the two or more PTC heating elements, the system controls the staged activation of the two or more PTC heating elements to achieve staged power control of the PTC unit, and further includes: After the driving voltage of the driving voltage unit stabilizes at the upper limit of the (n-1)th voltage range for a third set time, the driving voltage of the driving voltage unit is controlled to decrease linearly in the (n-1)th voltage range; after the driving voltage of the driving voltage unit begins to decrease linearly in the (n-1)th voltage range, the PTC heating element whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the (n-1)th voltage range and greater than the upper limit of the (n-2)th voltage range resumes operation from the high resistance state. PTC heating elements whose Curie temperature corresponds to a voltage value greater than the upper limit of the (n-2)th voltage range are designated as the (n-1)th group of PTC heating elements. After the driving voltage of the control driving voltage unit begins to decrease linearly in the (n-1)th voltage range, and the PTC heating elements whose Curie temperature corresponds to a voltage value less than or equal to the upper limit of the (n-1)th voltage range and greater than the upper limit of the (n-2)th voltage range recover from the high resistance state, the (n-1)th group of PTC heating elements continues to operate. After the driving voltage of the driving voltage unit is reduced to the upper limit of the (n-2)th voltage range, the driving voltage of the driving voltage unit is controlled to be stabilized at the upper limit of the (n-2)th voltage range. After the driving voltage of the driving voltage unit stabilizes at the upper limit of the (n-2)th voltage range for a predetermined time, the driving voltage of the driving voltage unit is controlled to decrease linearly in the (n-2)th voltage range; after the driving voltage of the driving voltage unit begins to decrease linearly in the (n-2)th voltage range, the PTC heating element whose voltage value corresponding to the Curie temperature is less than or equal to the upper limit of the (n-2)th voltage range and greater than the upper limit of the (n-3)th voltage range resumes operation from the high resistance state. PTC heating elements whose Curie temperature corresponds to a voltage value greater than the upper limit of the (n-3)th voltage range are designated as the (n-2)th group of PTC heating elements. After the driving voltage of the control driving voltage unit begins to decrease linearly in the (n-2)th voltage range, and the PTC heating elements whose Curie temperature corresponds to a voltage value less than or equal to the upper limit of the (n-2)th voltage range and greater than the upper limit of the (n-3)th voltage range recover from the high resistance state, the (n-2)th group of PTC heating elements continues to operate. This process continues until the driving voltage of the driving voltage unit decreases to the lower limit of the first voltage range, at which point all PTC heating elements are controlled to shut down.

8. A control device for an air conditioning system that uses the control method of any one of claims 1 to 7 to achieve control of the air conditioning system, characterized in that, The air conditioning system has an electric auxiliary heating device; The electric auxiliary heating device includes: a PTC unit and a driving voltage unit; the driving voltage unit is used to output a driving voltage to drive the PTC unit to work; the PTC unit includes: two or more PTC heating elements, and the Curie temperatures of the two or more PTC heating elements are different; the driving voltage has voltage ranges, and the number of voltage ranges is two or more; the control device of the air conditioning system includes: The acquisition unit is configured to acquire the target temperature of the air conditioning system after the air conditioning system is started; and to acquire the indoor ambient temperature of the room where the air conditioning system is located, and record it as the indoor ambient temperature of the air conditioning system. The control unit is configured to determine whether the air conditioning system is operating in heating mode, or the air conditioning system is operating in defrosting mode, or the air conditioning system receives a user's command to activate the electric auxiliary heating function. The control unit is also configured to keep the electric auxiliary heating device off if the condition is not met. The control unit is further configured to determine whether the electric auxiliary heating device needs to be turned on based on the indoor ambient temperature of the air conditioning system if the condition is met. The control unit is further configured to, when it is determined that the electric auxiliary heating device needs to be turned on, control the two or more PTC heating elements to start in stages according to the voltage range to which the driving voltage of the driving voltage unit belongs and the Curie temperature of the two or more PTC heating elements, so as to realize the staged power control of the PTC unit.

9. An air conditioning system, characterized in that, include: The control device for the air conditioning system as described in claim 8.

10. A storage medium, characterized in that, The storage medium includes a stored program, wherein, when the program is executed, the device containing the storage medium is controlled to perform the control method of the air conditioning system according to any one of claims 1 to 7.

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