Power control device, power control method and air conditioner

Abstract

The invention discloses a power control device, a power control method and an air conditioner. The power control device comprises a heater, a switch module and a control module, the switch module is connected between the heater and the control module, the switch module comprises at least one switch unit with adjustable conduction time, and the switch unit is used for controlling the heater to output at least two stages of output power. Accurate control over the output power of the heater is achieved, actual requirements of users are met, and energy consumption is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to a power control device, a power control method, and an air conditioner. Background Art

[0002] Air conditioners can not only cool but also heat, and have become indispensable electrical appliances in human life. Traditional air conditioning systems mainly rely on compressors to adjust the refrigerant cycle to achieve cooling and heating functions.

[0003] In the prior art, the air conditioner adjusts the heating power by turning on or off different working levels of the heater. However, when the external environmental temperature drops suddenly, the air conditioner may quickly exceed the set temperature in the high-power heating state, resulting in too high indoor temperature; while in the low-power state, it may not reach the set temperature due to insufficient heating, which will make users feel uncomfortable. That is, such a regulation method cannot accurately adjust the temperature, and it is easy to have overshoot or undershoot problems, thus causing waste of energy. Summary of the Invention

[0004] The present invention provides a power control device, a power control method, and an air conditioner to solve the problem that the power output cannot be dynamically and accurately adjusted according to the actual power demand during the heating of the air conditioner, thereby causing power waste.

[0005] According to one aspect of the present invention, a power control device is provided. The power control device includes a heater, a switch module, and a control module. The switch module is connected between the heater and the control module. The switch module includes at least one switch unit with adjustable conduction time, and the switch unit is used to control the heater to output at least two levels of output power.

[0006] According to another aspect of the present invention, a power control method is provided. The heating method includes:

[0007] Obtain the target output power of the heater;

[0008] According to the target output power, control the switch module of the heater to conduct, and the heater outputs at least two levels of output power.

[0009] According to another aspect of the present invention, an air conditioner is provided, characterized in that the air conditioner includes the power control device according to any embodiment of the present invention and can execute the power control method according to any embodiment of the present invention.

[0010] The technical solution of the embodiment of the present invention adjusts the conduction time of the switching unit to adjust the output power of the heater, so that the output power of the heater matches the power required by the user, avoiding overshoot or undershoot of the output power, and effectively reducing energy waste. That is, the present invention realizes precise control of the output power of the heater, not only meeting the actual needs of users, but also effectively reducing energy consumption.

[0011] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0013] Figure 1 It is a schematic structural diagram of a power control device provided by an embodiment of the present invention;

[0014] Figure 2 It is a flowchart of a power control method provided by an embodiment of the present invention;

[0015] Figure 3 It is a flowchart of another power control method provided by an embodiment of the present invention;

[0016] Figure 4 It is a flowchart of another power control method provided by an embodiment of the present invention;

[0017] Figure 5 It is a flowchart of another power control method provided by an embodiment of the present invention;

[0018] Figure 6 It is a flowchart of another power control method provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to enable those skilled in the art to better understand the solution of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present invention are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0021] Figure 1 FIG. is a schematic structural diagram of a power control device provided by an embodiment of the present invention. This embodiment is applicable to controlling the output power during air conditioner heating, and the power control device can be configured in the air conditioner. As Figure 1 shown, the power control device includes: a heater 110, a switch module 120, and a control module 130. The switch module 120 is connected between the heater 110 and the control module 130. The switch module 120 includes at least one switch unit 121 with adjustable conduction time, and the switch unit 121 is used to control the heater 110 to output at least two levels of output power.

[0022] Specifically, the power control device refers to a device for adjusting the output power of an air conditioner. The heater 110 refers to a heating device in the air conditioner. Exemplarily, the heater 110 can be an electric heating wire. In the embodiment of the present invention, the heater 110 is responsible for converting electrical energy into heat energy to heat air or other media. The switch module 120 refers to a module for controlling the on / off state of the heater and adjusting its output power. The switch unit 121 refers to the basic unit in the switch module, which is responsible for specifically implementing the opening and closing of the switch. By adjusting the conduction time of the switch unit 121, the power output of the heater 110 can be adjusted. The control module 130 refers to an electronic module for intelligently managing and controlling the power control device. In the embodiment of the present invention, the control module 130 can receive sensor data and adjust the working state of the switch module 120 according to a preset algorithm, so as to realize the control of the power of the heater 110. The output power refers to the actual thermal power output by the heater 110. By adjusting different output power levels, the heating requirements of users in different situations can be met.

[0023] In an embodiment of the present invention, the control module 130 can control the conduction state of the switch module 120, and further control the output power of the heater 110. Among them, the switch module 120 includes at least one switch unit 121 with adjustable conduction time. By adjusting the conduction time of the switch unit 121, the output power of the heater 110 can be adjusted.

[0024] The technical solution of the embodiment of the present invention realizes the adjustment of the output power of the heater by adjusting the conduction time of the switch unit, so that the output power of the heater matches the power required by the user, avoiding overshoot or undershoot of the output power, and effectively reducing energy waste. That is, the present invention realizes precise control of the output power of the heater, not only meeting the actual needs of users, but also effectively reducing energy consumption.

[0025] Based on the above embodiments, optionally, the switch unit includes a first type of switch, which is connected between the first end of the heater and the first end of the control module. The first type of switch is used to control the heater to output m levels of output power, where m is greater than or equal to 1; and / or, the switch unit includes a second type of switch, which is connected between the second end of the heater and the second end of the control module. The second type of switch is used to control the heater to output n levels of output power; n is greater than or equal to 1.

[0026] Specifically, the first type of switch refers to a specific switch in the switch unit used to control the power output of the heater. By opening or closing the first type of switch, the heater can output m levels of output power. The second type of switch refers to another specific switch in the switch unit used to control the power output of the heater. By opening or closing the second type of switch, the heater can output n levels of output power.

[0027] Exemplarily, the first type of switch can be a switch with non-adjustable conduction time, such as a magnetic latching relay, etc. At this time, m = 1, and the heater can output one level of output power. The second type of switch can be a switch with adjustable conduction time, such as an IGBT module or a solid-state relay, etc. By adjusting the duty cycle of the IGBT or the conduction time ratio of the solid-state relay, the heater can output n levels of output power. Or, both the first type of switch and the second type of switch can be switches with adjustable conduction time, such as an IGBT module or a solid-state relay, etc. Or, the first type of switch can be a switch with adjustable conduction time, and the second type of switch can be a switch with non-adjustable conduction time.

[0028] It should be noted that the embodiments of the present invention only give examples of the types of the first type of switch and the second type of switch. In actual applications, other types of switches can be selected according to specific requirements to achieve more flexible and efficient power control. The embodiments of the present invention do not limit this.

[0029] Optionally, the number of the first type of switches is h, and the number of the second type of switches is k. The heater outputs h*m + k*n levels of output power; h is greater than or equal to 1, and k is greater than or equal to 1.

[0030] In the embodiment of the present invention, h first-type switches control the heater to output h*m levels of output power, and k second-type switches control the heater to output k*n levels of output power. The heater can output a total of h*m + k*n levels of output power. The more the number of switches, the more power levels the heater can output.

[0031] Optionally, the conduction control mode of the switch unit includes at least one of time ratio control and duty cycle control.

[0032] Specifically, time ratio control refers to a method of power regulation by adjusting the ratio of the conduction time to the off time of the switch. During the control period, the ratio of the conduction time to the disconnection time of the switch can affect the output power. For example, in a complete control period, if the conduction time of the switch accounts for a higher proportion, the output power is larger; if the conduction time accounts for a lower proportion, the output power is smaller. Exemplarily, if a solid-state relay is included in the first type of switch or the second type of switch, time ratio control can be used to adjust the conduction time of the solid-state relay. Duty cycle control refers to a specific time ratio control method, which is usually used in pulse width modulation and can achieve high-efficiency and high-precision power regulation. The duty cycle refers to the proportion of the conduction time of the switch in a cycle to the entire cycle. By adjusting the duty cycle, it is possible to precisely control when and for how long the switch conducts, thereby accurately regulating the power output. Exemplarily, if an IGBT is included in the first type of switch or the second type of switch, duty cycle control can be used to adjust the conduction time of the IGBT.

[0033] In the embodiment of the present invention, the basic principle of time ratio control is easy to understand and implement, suitable for simple systems, and convenient for rapid deployment and use. Duty cycle control can provide more precise power regulation, with a faster response speed, and can achieve high-frequency switching of 1 kHz and above, suitable for application scenarios that require high performance and high precision. Through time ratio control and duty cycle control, the heater can dynamically adjust the output power according to actual needs, effectively reducing unnecessary energy losses and ensuring stable output of the heater.

[0034] The technical solution of the embodiment of the present invention enables the heater to flexibly adjust the power output according to changes in the environment and load by respectively controlling the conduction modes of the first type of switches and the second type of switches in the switch unit. The present invention realizes precise power regulation and flexible temperature control, thereby efficiently and accurately meeting the heating requirements in different environments.

[0035] Figure 2The flowchart of a power control method provided by an embodiment of the present invention. This power control method can be used to adjust the output power of a heater, which can be implemented by a power control device configured in an air conditioner. As Figure 2 shown, this power control method includes:

[0036] S110. Obtain the target output power of the heater.

[0037] Specifically, the target output power refers to the power that the control system of the heater designates for the heater to output according to the current load and environmental changes.

[0038] In an embodiment of the present invention, obtaining the target output power of the heater can provide a basis for the output power of the heater and guide the conduction control modes of the first type of switch and the second type of switch in the switch unit.

[0039] S120. According to the target output power, control the switch module of the heater to conduct, and the heater outputs at least two levels of output power.

[0040] Specifically, the output power refers to the energy transfer rate that the heater actually provides to the load. Among multiple levels of output power, each level represents a different power output capability to enhance the adaptability and flexibility of the heater to environmental changes.

[0041] In an embodiment of the present invention, the heater outputs at least two different levels of output power so that it can be flexibly adjusted under different working conditions. Exemplarily, when the environmental temperature is relatively low, the target output power is relatively high, and the heater can output two levels or more than two levels of output power to quickly heat; while when the environmental temperature is close to the set value, the target power is relatively low, and only one level of power output can be turned on to maintain the temperature without causing overheating.

[0042] The technical solution of the embodiment of the present invention adjusts the output power of the heater through the switch module according to the target output power, so that the output power of the heater matches the power required by the user, avoiding overshoot or undershoot of the output power, and thus effectively reducing energy waste. That is, the present invention realizes precise control of the heater power output, which not only meets the actual needs of users but also effectively reduces energy consumption.

[0043] Figure 3 The flowchart of another power control method provided by an embodiment of the present invention. On the basis of the above embodiments, as Figure 3 shown, optionally, this power control method includes:

[0044] S210. Obtain the target output power of the heater.

[0045] S220. According to the target output power, turn on i first - type switches and p second - type switches, where 0 ≤ i ≤ h and 0 ≤ p ≤ k.

[0046] Exemplarily, the target output power of the heater is 4000 watts. The switch unit includes 1 first - type switch and 2 second - type switches. Among them, the first - type switch is a switch with non - adjustable conduction time and the maximum output power is 1000 watts; the first second - type switch can achieve 2 - level power output through time - ratio control and the maximum output power is 2000 watts; the second second - type switch can achieve 4 - level power output by adjusting PWM and the maximum output power is 4000 watts. At this time, the opening mode of the switches can be: turn on one first - type switch and two second - type switches simultaneously, and adjust the output power level of the second - type switches by adjusting the conduction - time ratio or duty cycle of the second - type switches to achieve a power output of 4000 watts; or, only turn on the second - type power switch with a maximum output power of 4000 watts to make it output 4 - level output power to meet the target output power; or, turn on two second - type switches and turn off the first - type switch, etc.

[0047] In the embodiment of the present invention, determine the number of first - type switches and second - type switches to be turned on according to the target output power, so that the number of turned - on switches can meet the requirements of the target output power, ensuring that while meeting the user's needs, the heater reduces unnecessary energy waste.

[0048] S230. Adjust the conduction time of i first - type switches and the conduction time of p second - type switches until the heater outputs the target output power.

[0049] Exemplarily, the target output power of the heater is 4000 watts. The switch unit includes 1 first - type switch and 2 second - type switches. Among them, the first - type switch is a switch with non - adjustable conduction time and the maximum output power is 1000 watts; the first second - type switch can achieve 2 - level power output through time - ratio control and the maximum output power is 2000 watts; the second second - type switch can achieve 4 - level power output by adjusting PWM and the maximum output power is 4000 watts. If the opening mode of the switches is: turn on one first - type switch and two second - type switches simultaneously, then the first - type switch is in the normally - open state, controlling the heater to output 1000 watts of output power. The conduction modes of the two second - type switches can be: adjust the ratio of the conduction time to the turn - off time of the first second - type switch to 1:1 to make it output 1000 watts of output power, and adjust the duty cycle of the second second - type switch to 50% to make it output 2000 watts of output power, and finally make the heater achieve a power output of 4000 watts.

[0050] The technical solution of the embodiment of the present invention can control the heater to output exactly the target output power through the cooperation of the first type of switch and the second type of switch, enabling precise temperature control and avoiding power waste, providing users with an energy-saving, comfortable and efficient heating experience.

[0051] Figure 4 FIG. 4 is a flowchart of another power control method provided by an embodiment of the present invention. On the basis of the above embodiments, as Figure 4 shown, optionally, the power control method includes:

[0052] S310. Obtain the target output power of the heater.

[0053] S320. According to the target output power, turn on i first-type switches and p second-type switches, where 0 ≤ i ≤ h and 0 ≤ p ≤ k.

[0054] S330. Control the i first-type switches to conduct continuously.

[0055] Specifically, the i first-type switches are switches with non-adjustable conduction time, and the p second-type switches are switches with adjustable conduction time.

[0056] In the embodiment of the present invention, frequent switching of the switch will cause mechanical wear and electrical shock, which may lead to a shortened switch life. By controlling the first-type switches to conduct continuously, the working frequency of the first-type switches is reduced, thereby reducing the wear on the device and prolonging the service life of the switch. In addition, since the first-type switches do not need to conduct continuously, switches with non-adjustable conduction time, such as magnetic latching relays, can be selected, further reducing the cost.

[0057] S340. Adjust the time ratio and / or duty cycle of the p second-type switches until the heater outputs the target output power.

[0058] Exemplarily, the target output power of the heater is 4000 watts, the switch unit includes 1 first-type switch and 2 second-type switches. Among them, the first-type switch is a switch with non-adjustable conduction time and the maximum output power is 1000 watts; the first second-type switch can achieve 2-level power output through time ratio control and the maximum output power is 2000 watts; the second second-type switch can achieve 4-level power output by adjusting PWM and the maximum output power is 4000 watts. The conduction mode of the switch can be: keep the first-type switch conducting continuously to output 1000 watts of output power; adjust the conduction time to off-time ratio of the first second-type switch to 1:0 to make it output 2000 watts of output power; adjust the duty cycle of the second second-type switch to 50% to make it output 1000 watts of output power.

[0059] In the technical solution of the embodiment of the present invention, by controlling the first type of switch to conduct continuously, the control complexity and cost are reduced, and the service life of the first type of switch is increased; by controlling the conduction time of the second type of switch, the accurate adjustment of the output power of the heater is realized, avoiding overshoot or undershoot of the heater, and improving the energy utilization efficiency. That is, the present invention can reduce the control complexity and cost while achieving accurate temperature control, and improve the energy utilization efficiency.

[0060] Figure 5 As shown in the flowchart of another power control method provided by the embodiment of the present invention, on the basis of the above embodiments, Figure 5 As shown, optionally, the power control method includes:

[0061] S410. Obtain the target output power of the heater.

[0062] S420. According to the target output power, turn on i first type of switches and p second type of switches, where 0 ≤ i ≤ h and 0 ≤ p ≤ k.

[0063] S430. Control the p second type of switches to conduct continuously.

[0064] Specifically, the i first type of switches are switches with adjustable conduction time, and the p second type of switches are switches with non-adjustable conduction time.

[0065] In the embodiment of the present invention, the frequent switching of the switch will cause mechanical wear and electrical shock, which may lead to a shortened service life of the switch. By controlling the second type of switch to conduct continuously, the working frequency of the second type of switch is reduced, thereby reducing the wear on the device and extending the service life of the switch. In addition, since the second type of switch does not need to conduct continuously, a switch with non-adjustable conduction time, such as a magnetic latching relay, can be selected, further reducing the cost.

[0066] S440. Adjust the time ratio and / or duty cycle of the i first type of switches until the heater outputs the target output power.

[0067] Exemplarily, the target output power of the heater is 6500 watts, the switch unit includes 1 first type of switch and 2 second type of switches. Among them, the first type of switch can achieve 2-level power output through time ratio control, and the maximum output power is 1000 watts; the conduction time of the first second type of switch is non-adjustable, and the maximum output power is 2000 watts; the conduction time of the second second type of switch is non-adjustable, and the maximum output power is 4000 watts. The conduction mode of the switch can be: keep the two second type of switches conducting continuously to output 6000 watts of output power; adjust the ratio of the conduction time to the turn-off time of the first type of switch to 1:1 to make it output 500 watts of output power.

[0068] The technical solution of the embodiment of the present invention reduces the control complexity and cost by controlling the continuous conduction of the second type of switch, and improves the service life of the second type of switch; the accurate adjustment of the output power of the heater is achieved by controlling the conduction time of the first type of switch, avoiding overshoot or undershoot of the heater, and improving the energy utilization efficiency. That is, the present invention can reduce the control complexity and cost while achieving accurate temperature control, and improve the energy utilization efficiency.

[0069] Figure 6 FIG. 4 is a flowchart of another power control method provided by an embodiment of the present invention. On the basis of the above embodiments, as Figure 6 shown, optionally, the power control method includes:

[0070] S510. Obtain the current ambient temperature and the target ambient temperature.

[0071] Specifically, the current ambient temperature refers to the air temperature measured in real time at a specific time and location. This temperature is monitored by devices such as temperature sensors, reflecting the actual thermal state of the surrounding environment. The target ambient temperature refers to the indoor temperature that the user sets and hopes to reach.

[0072] In the embodiment of the present invention, obtaining the current ambient temperature and the target ambient temperature is the basis for the effective operation of the air conditioner heater.

[0073] S520. Determine the ambient temperature difference according to the target ambient temperature and the current ambient temperature.

[0074] Specifically, the temperature difference refers to the difference between the target ambient temperature and the current ambient temperature.

[0075] Temperature difference = target ambient temperature - current ambient temperature

[0076] S530. If the temperature difference is less than the first threshold, determine the target output power of the heater according to the PID control algorithm.

[0077] Specifically, the first threshold refers to a preset temperature difference range for determining the adjustment strategy of the heater. Exemplarily, the first threshold can be 2°C. When the calculated temperature difference is less than the first threshold, it indicates that the temperature difference is small, and the PID algorithm is used to determine the target output power of the heater. The PID control algorithm refers to a feedback control technology, including three control terms: proportional, integral, and derivative. The control formula is as follows:

[0078]

[0079] where u(t) represents the target output power; K p 、Ki and K d respectively represent the proportional gain coefficient, integral gain coefficient, and derivative gain coefficient; e(t) is the difference between the target output power and the current output power; a represents the time variable.

[0080] In the embodiment of the present invention, PID control is a closed-loop feedback algorithm. Using the PID control algorithm to determine the target output power of the heater can monitor the current temperature in real time, continuously calculate the error, and then continuously adjust the output power of the heater to ensure the accuracy and reliability of the output power.

[0081] S540. If the temperature difference is greater than or equal to the first threshold, set the integral gain coefficient in the PID control algorithm to 0, determine the anti-windup PID control algorithm, and determine the target output power of the heater according to the anti-windup PID control algorithm.

[0082] Specifically, the integral gain coefficient is the coefficient used to calculate the integral term in the PID control algorithm, which is used to correct past errors and help eliminate the steady-state error by accumulating errors. The anti-windup PID control algorithm is an optimized PID control strategy that sets the integral gain coefficient in the PID control algorithm to 0 when the temperature difference is greater than or equal to the first threshold, aiming to prevent integral accumulation in a high-error state, thereby ensuring the stability of the output power.

[0083] In the embodiment of the present invention, when the control output of the heater reaches the saturation state, the integral term may continue to increase, resulting in slow or even ineffective control response. By setting the integral gain coefficient to 0 when the temperature difference is greater than the first threshold, this saturation effect can be reduced or eliminated, enabling the heater to still have a sensitive and effective response ability when facing large errors.

[0084] S550. According to the target output power, control the switch module of the heater to conduct, and the heater outputs at least two levels of output power.

[0085] The technical solution of the embodiment of the present invention effectively prevents the heater from experiencing integral saturation by setting the integral gain coefficient in the PID control algorithm to 0 when the temperature difference is greater than or equal to the first threshold, thereby improving the response speed and stability of the air conditioner heating device to external temperature changes.

[0086] The embodiment of the present invention also provides an air conditioner, which includes the power control device provided by the embodiment of the present invention, can execute the power control method provided by any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0087] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in the present invention can be executed in parallel, sequentially, or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and no limitation is made herein.

[0088] The above specific embodiments do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub - combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A power control device, characterized in that, The power control device includes a heater, a switch module, and a control module. The switch module is connected between the heater and the control module. The switch module includes at least one switch unit with adjustable conduction time, and the switch unit is used to control the heater to output at least two levels of output power.

2. The power control device according to claim 1, wherein the switch unit includes a first type of switch, the first type of switch is connected between the first end of the heater and the first end of the control module, and the first type of switch is used to control the heater to output m levels of output power, where m is greater than or equal to 1; and / or, the switch unit includes a second type of switch, the second type of switch is connected between the second end of the heater and the second end of the control module, and the second type of switch is used to control the heater to output n levels of output power; n is greater than or equal to 1.

3. The power control device according to claim 2, characterized in that The number of the first type of switches is h, the number of the second type of switches is k, and the heater outputs h*m + k*n levels of output power; h is greater than or equal to 1, and k is greater than or equal to 1.

4. The power control device according to claim 1, characterized in that The conduction control mode of the switch unit includes at least one of time ratio control and duty cycle control.

5. A power control method, characterized in that, The power control method includes: Obtaining the target output power of the heater; According to the target output power, controlling the switch module of the heater to conduct, and the heater outputs at least two levels of output power.

6. The power control method according to claim 5, wherein The step of, according to the target output power, controlling the switch module of the heater to conduct, and the heater outputs at least two levels of output power, includes: According to the target output power, turning on i first type of switches and p second type of switches, where 0 ≤ i ≤ h, 0 ≤ p ≤ k; Adjusting the conduction time of the i first type of switches and the conduction time of the p second type of switches until the heater outputs the target output power.

7. The power control method according to claim 6, wherein The step of adjusting the conduction time of the i first type of switches and the conduction time of the p second type of switches until the heater outputs the target output power, includes: Controlling the i first type of switches to conduct continuously; Adjusting the time ratio and / or duty cycle of the p second type of switches until the heater outputs the target output power.

8. The power control method according to claim 6, characterized in that, The step of adjusting the conduction time of the i first type of switches and the conduction time of the p second type of switches until the heater outputs the target output power, includes: Controlling the p second type of switches to conduct continuously; Adjusting the time ratio and / or duty cycle of the i first type of switches until the heater outputs the target output power.

9. The power control method according to claim 5, wherein The step of obtaining the target output power of the heater includes: Obtaining the current ambient temperature and the target ambient temperature; Determining the ambient temperature difference according to the target ambient temperature and the current ambient temperature; If the temperature difference is less than the first threshold, determining the target output power of the heater according to the PID control algorithm; If the temperature difference is greater than or equal to the first threshold, setting the integral gain coefficient in the PID control algorithm to 0, determining the anti-windup PID control algorithm, and determining the target output power of the heater according to the anti-windup PID control algorithm.

10. An air conditioner, characterized in that, The air conditioner includes the power control device described in any one of claims 1-4 and is capable of performing the power control method described in any one of claims 5-9.

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