Energy-saving circuit of washing and protecting equipment, control method of energy-saving circuit of washing and protecting equipment, control device of energy-saving circuit of washing and protecting equipment and washing and protecting equipment

Abstract

The application provides an energy-saving circuit of a washing and protecting device, a control method of the energy-saving circuit of the washing and protecting device, a control device of the energy-saving circuit of the washing and protecting device and the washing and protecting device. The energy-saving circuit comprises multiple motors, which are used for driving washing drums, the washing drums and the motors are in one-to-one correspondence, and the washing drums are used for washing clothes; a drying circuit is used for converting electric energy into heat energy to dry the clothes; an energy recovery circuit is electrically connected with the motors and the drying circuit respectively, the energy recovery circuit is used for turning on or turning off between the multiple motors, and the energy recovery circuit is also used for turning on or turning off between the motors and the drying circuit. The scheme solves the problem of low energy efficiency of a multi-drum washing machine in the prior art.

Description

Technical Field

[0001] This application relates to the field of energy-saving technology for washing machines, and more specifically, to an energy-saving circuit for a washing and care device, a control method for the energy-saving circuit of a washing and care device, a control device for the energy-saving circuit of a washing and care device, and a washing and care device. Background Technology

[0002] With increasing environmental awareness and rising energy costs, improving the energy efficiency of laundry equipment has become a key research focus. Traditional multi-tub washing machines are typically equipped with multiple motors, which increases system complexity and manufacturing costs, while also reducing overall energy efficiency. Summary of the Invention

[0003] The main objective of this application is to provide an energy-saving circuit for a washing and care device, a control method for the energy-saving circuit of a washing and care device, a control device for the energy-saving circuit of a washing and care device, and a washing and care device, so as to at least solve the problem of low energy efficiency of multi-tub washing machines in the prior art.

[0004] To achieve the above objectives, according to one aspect of this application, an energy-saving circuit for a laundry device is provided, comprising: a plurality of motors for driving a washing tub, wherein the washing tub and the motor are in one-to-one correspondence, and the washing tub is used for washing clothes; a drying circuit for converting electrical energy into heat energy to dry clothes; and an energy recovery circuit electrically connected to the motors and the drying circuit respectively, wherein the energy recovery circuit is used to turn on or off the plurality of motors, and the energy recovery circuit is also used to turn on or off the motors and the drying circuit, wherein turning on or off the plurality of motors allows energy from the decelerated motors to be supplied to the accelerated motors.

[0005] Optionally, the energy recovery circuit includes: a rectifier bridge circuit having an input terminal and an output terminal, the input terminal of the rectifier bridge circuit being electrically connected to the motor, the rectifier bridge circuit being used to convert the alternating current generated by the motor into direct current; a DC-DC converter circuit having an input terminal and an output terminal, the input terminal of the DC-DC converter circuit being electrically connected to the output terminal of the rectifier bridge circuit; and an IPM circuit having an input terminal and an output terminal, the input terminal of the IPM circuit being electrically connected to the output terminal of the DC-DC converter circuit, the IPM circuit being used to drive the motor or drive the drying circuit.

[0006] Optionally, the energy recovery circuit further includes: a plurality of switches, each having a fixed terminal, a first selection terminal and a second selection terminal, wherein when the fixed terminal and the first selection terminal are connected, the motor and the drying circuit are connected, and when the fixed terminal and the second selection terminal are connected, the plurality of motors are connected.

[0007] Optionally, the switch is a double-pole double-throw switch.

[0008] According to another aspect of this application, a control method for an energy-saving circuit of any of the aforementioned washing and care devices is provided. The method includes: acquiring the rotational speed of each of the motors; determining, based on the rotational speed of the motors, whether each of the motors is decelerating or accelerating; when at least one of the motors is decelerating and at least one of the motors is accelerating, controlling the energy recovery circuit to connect the plurality of motors and controlling the energy recovery circuit to disconnect the connection between the motors and the drying circuit; or, when at least one of the motors is decelerating and no motor is accelerating, controlling the energy recovery circuit to disconnect the connection between the plurality of motors and controlling the energy recovery circuit to connect the motors and the drying circuit.

[0009] Optionally, when at least one of the motors is decelerating and at least one of the motors is accelerating, controlling the energy recovery circuit to connect multiple motors and control the energy recovery circuit to disconnect the connection between the motors and the drying circuit; or, when at least one motor is decelerating and no motor is accelerating, controlling the energy recovery circuit to disconnect the connection between multiple motors and control the energy recovery circuit to connect the connection between the motors and the drying circuit, includes: acquiring a preset washing program of the laundry equipment, wherein the preset washing program includes washing, rinsing, and spin-drying; when at least one motor is decelerating, at least one motor is accelerating, and the current washing program of the laundry equipment is washing or rinsing, controlling the energy recovery circuit to connect multiple motors and control the energy recovery circuit to disconnect the connection between the motors and the drying circuit; or, when at least one motor is decelerating, no motor is accelerating, and the current washing program of the laundry equipment is spin-drying, controlling the energy recovery circuit to disconnect the connection between multiple motors and control the energy recovery circuit to connect the connection between the motors and the drying circuit.

[0010] Optionally, the energy recovery circuit further includes multiple switches, each having a fixed terminal, a first selection terminal, and a second selection terminal. When the fixed terminal and the first selection terminal are connected, the motor and the drying circuit are connected. When the fixed terminal and the second selection terminal are connected, the multiple motors are connected. When at least one motor is decelerating and at least one motor is accelerating, controlling the energy recovery circuit to connect the multiple motors and controlling the energy recovery circuit to disconnect the motor and the drying circuit includes: controlling the fixed terminal and the first selection terminal to disconnect; and controlling the fixed terminal and the second selection terminal to connect.

[0011] Optionally, when at least one of the motors is decelerating and none of the motors is accelerating, controlling the energy recovery circuit to shut off the multiple motors and controlling the energy recovery circuit to connect the motors and the drying circuit includes: controlling the connection between the fixed terminal and the first selection terminal; and controlling the shutdown between the fixed terminal and the second selection terminal.

[0012] According to another aspect of this application, a control device for an energy-saving circuit of any of the aforementioned washing and care devices is provided. The device includes: an acquisition unit for acquiring the rotational speed of each of the motors; a determination unit for determining, based on the rotational speed of the motors, whether each of the motors is decelerating or accelerating; and a control unit for controlling the energy recovery circuit to connect the plurality of motors and disconnect the motors from the drying circuit when at least one motor is decelerating and at least one motor is accelerating, or controlling the energy recovery circuit to disconnect the plurality of motors and connect the motors from the drying circuit when at least one motor is decelerating and no motor is accelerating.

[0013] According to another aspect of this application, a washing and care device is provided, the washing and care device comprising: an energy-saving circuit, the energy-saving circuit being any of the energy-saving circuits of the washing and care device; and a control device electrically connected to the energy-saving circuit, the control device being used to execute a control method for any of the energy-saving circuits of the washing and care device.

[0014] By applying the technical solution of this application, based on the existing multi-tub washing machine, the energy-saving circuit of the above-mentioned washing and care equipment is supplemented with an energy recovery circuit. This circuit can capture the energy generated by the motor when the motor decelerates and supply it to other motors or the drying circuit. In this way, the motor can be used as a generator when it decelerates, recovering and utilizing the energy that would otherwise be lost, thereby improving the energy efficiency of the multi-tub washing machine. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0016] Figure 1 A schematic diagram of the energy-saving circuit of a twin-tub washing machine is shown.

[0017] Figure 2 A schematic diagram of the specific structure of the energy-saving circuit of a twin-tub washing machine is shown.

[0018] Figure 3 A hardware structure block diagram of a mobile terminal for controlling an energy-saving circuit of a washing and care device according to an embodiment of this application is shown.

[0019] Figure 4 A schematic flowchart of a control method for an energy-saving circuit of a washing and care device according to an embodiment of this application is shown.

[0020] Figure 5 A flowchart illustrating a control method for an energy-saving circuit in a washing and care device is shown.

[0021] Figure 6 A structural block diagram of a control device for an energy-saving circuit of a washing and care equipment according to an embodiment of this application is shown.

[0022] The above figures include the following reference numerals:

[0023] 102. Processor; 104. Memory; 106. Transmission device; 108. Input / output device; 10. Rectifier bridge circuit; 11. DC-DC converter circuit; 12. IPM circuit; 13. First motor; 14. Second motor; 15. Drying circuit; 16. First switch; 17. Second switch; 18. Bus capacitor. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0026] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0027] As described in the background section, existing multi-tub washing machines have low energy efficiency. To address the above problems, embodiments of this application provide an energy-saving circuit for a washing and care device, a control method for the energy-saving circuit of a washing and care device, a control device for the energy-saving circuit of a washing and care device, and a washing and care device.

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0029] This application provides an energy-saving circuit for a washing and care device, including:

[0030] Multiple motors are used to drive the washing tub. The washing tub and the motor are in one-to-one correspondence. The washing tub is used to wash clothes.

[0031] A drying circuit is used to convert electrical energy into heat energy to dry clothes;

[0032] An energy recovery circuit is electrically connected to the aforementioned motors and the aforementioned drying circuit, respectively. The energy recovery circuit is used to turn the multiple motors on or off. The energy recovery circuit is also used to turn the multiple motors on or off, wherein the energy of the decelerated motors is supplied to the accelerated motors by turning the multiple motors on or off.

[0033] Specifically, the washing and care equipment is a washing machine, but it can also be other washing and care equipment. The following embodiments of this solution will use a twin-tub washing machine for explanation and illustration.

[0034] Specifically, for the three-phase permanent magnet synchronous brushless motor used in washing machines: when the motor is powered, it will speed up and rotate; when the power supply to the motor is removed, due to inertia, the motor speed will not instantly reach zero but will slowly decelerate to zero. During this process, due to the principle of electromagnetic induction, voltage will be induced at the three-phase control terminals of the motor.

[0035] During the operation of a washing machine, the rotating drum has high kinetic energy and undergoes multiple motor decelerations during the washing process. This energy is usually wasted as heat, leading to reduced energy efficiency. Therefore, this solution adds an energy recovery circuit to the energy-saving circuit of the aforementioned washing and care equipment, based on the existing multi-tub washing machine. This circuit can capture the energy generated by the motor when it decelerates and supply it to other motors or the drying circuit. In this way, the motor can be used as a generator when it decelerates, recovering and utilizing the energy that would otherwise be lost, thereby improving the energy efficiency of the multi-tub washing machine.

[0036] Specifically, the aforementioned motor configuration is designed to meet the needs of multi-tub washing machines, with each tub equipped with its own dedicated motor to independently control the rotation speed of each tub. The aforementioned drying circuit is designed to utilize electrically heated elements to generate hot air or heat energy for drying clothes.

[0037] Specifically, the energy recovery circuit described above captures and converts the induced electrical energy generated by the motor during deceleration or braking, allowing it to be used for accelerating other motors or preheating the drying circuit. It uses a controllable switch to connect and disconnect the current between the motors and the drying circuit, thus flexibly reusing this electrical energy.

[0038] In the specific implementation process, such as Figure 1 As shown, the arrows indicate the direction of energy transmission. The energy recovery circuit includes a rectifier bridge circuit 10, a DC-DC converter circuit 11, and an IPM circuit 12. The rectifier bridge circuit has an input terminal and an output terminal. The input terminal of the rectifier bridge circuit is electrically connected to the motor. The rectifier bridge circuit is used to convert the AC power generated by the motor into DC power. The DC-DC converter circuit has an input terminal and an output terminal. The input terminal of the DC-DC converter circuit is electrically connected to the output terminal of the rectifier bridge circuit. The IPM circuit has an input terminal and an output terminal. The input terminal of the IPM circuit is electrically connected to the output terminal of the DC-DC converter circuit. The IPM circuit is used to drive the motor or drive the drying circuit.

[0039] In this scheme, the introduction of the rectifier bridge circuit enables the electrical energy generated by the motor during deceleration to be effectively converted and utilized, rather than simply dissipated as heat. Through the DC-DC conversion circuit, the electrical energy generated by the motor during deceleration is converted into stable DC power suitable for the operating range of the IPM circuit. The use of the IPM circuit achieves high efficiency in motor control and drying circuit drive, thereby improving energy utilization.

[0040] Specifically, when the motor decelerates, the rectifier bridge circuit converts the AC energy generated by the electromagnetic induction of the motor coils into DC energy. The function of the DC-DC converter circuit is to adjust the DC energy output by the rectifier bridge circuit so that its voltage and current meet the requirements of the IPM circuit, ensuring that the electrical energy can be effectively used for motor control or heating of the drying circuit. The IPM circuit (Intelligent Power Module) is responsible for controlling the motor speed and the heating operation of the drying circuit.

[0041] Specifically, for a twin-tub washing machine, assuming both motors (motor 13 and motor 14) are braking, even after the drive signal is removed, the two motors will continue to rotate due to inertia. The magnetic flux through the motor coils will also change, inducing an alternating voltage between the three phases of the two motors. Since the heating and drying circuit 15 described in this solution is a purely resistive load, relying on the Joule heating effect of current, its power supply requirements are not high. The electrothermal efficiency of resistive loads is inherently high, and the induced voltage from the motors can be used directly for power supply. By switching the two motors to the heating and drying circuit of the resistive load using different controllable switches, the two motors can be decelerated synchronously, ultimately converting mechanical energy into heat energy. Energy conversion process: Mechanical energy - Electrical energy - Heat energy.

[0042] Specifically, assuming the first motor 13 decelerates and the second motor 14 accelerates, when the drive of the first motor 13 is removed (manifested as the connection between the IPM and the motor), the first motor 13 will still rotate due to inertia, and the magnetic flux through the motor coil will also change, generating an induced alternating voltage between the three phases of the first motor 13. Connecting the three phases of the first motor 13 to a three-phase rectifier bridge yields pulsating direct current, which is then converted to a usable range by a DC-DC converter. After connecting the second motor 14 to the IPM, the second motor 14 can utilize the electrical energy generated by the first motor 13. Energy conversion process: Mechanical energy - Electrical energy - Mechanical energy.

[0043] Specifically, such as Figure 2 As shown, the rectifier bridge circuit includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, and a sixth diode D6.

[0044] Specifically, such as Figure 2 As shown, the drying circuit includes resistors R1, R2, R3, R4, R5, and R6. The IPM circuit is also electrically connected to resistors R7, R8, R9, and capacitor C1. The rectifier bridge circuit, DC-DC converter circuit, and IPM circuit are all existing circuits.

[0045] Specifically, while typical IPM drive circuits include three-phase current sampling resistors, the power generated by the motor braking deceleration in this solution does not pass through the IPM drive circuit, thus reducing losses. This solution eliminates the need for a battery and its charging circuit, allowing two motors to share a single IPM, resulting in lower costs, higher safety, and reduced losses.

[0046] By recovering the electrical energy generated during the deceleration of one drum and using it to accelerate the motor of the other drum, or by recovering the electrical energy from the deceleration of both drums for preheating the drying circuit, energy waste is significantly reduced, and the overall energy efficiency of the system is improved. Due to the reuse of electrical energy, the demand for grid power is reduced, thereby lowering the operating costs of the washing machine and saving users on electricity bills.

[0047] In some embodiments, the energy recovery circuit further includes multiple switches, each having a fixed terminal, a first selection terminal, and a second selection terminal. When the fixed terminal and the first selection terminal are connected, the motor and the drying circuit are connected. When the fixed terminal and the second selection terminal are connected, the multiple motors are connected.

[0048] In this scheme, the switch acts as a bridge in the circuit, dynamically adjusting the direction of energy flow. When the fixed terminal is connected to the first selector terminal, energy flows from the motor to the drying circuit; while when the fixed terminal is connected to the second selector terminal, energy flows between the motors, thereby achieving energy redistribution and recycling.

[0049] Specifically, compared to traditional washing machine drive circuits, this solution adds a double-pole double-throw controllable first switch 16 and a controllable second switch 17 to each phase of the motor. These switches are program-controlled to freely connect either the first motor 13 or the second motor 14 to the IPM, the drying circuit, and the downstream three-phase rectifier bridge as needed. Therefore, in this solution, the electricity generated by the motor during braking and deceleration has two uses: one is to supply the other motor to increase its speed, and the other is to preheat the heating components in the drying circuit.

[0050] In some embodiments, the switch described above is a double-pole double-throw switch. Of course, it can also be an H-bridge composed of relays or MOSFETs, or a bidirectional thyristor.

[0051] Specifically, such as Figure 2 As shown, the energy recovery circuit includes 12 relays, namely the first relay S1, the second relay S2, the third relay S3, the fourth relay S4, the fifth relay S5, the sixth relay S6, the seventh relay S7, the eighth relay S8, the ninth relay S9, the tenth relay S10, the eleventh relay S11, and the twelfth relay S12.

[0052] Specifically, the proposed energy-saving circuit for a twin-tub washing machine adds a controllable switch, a three-phase rectifier bridge, and a DC-DC circuit to the traditional washing machine motor control circuit. This allows the electricity generated during motor braking to boost the speed of the other motor or to preheat the drying circuit's heating element. This enables one tub to accelerate while the other decelerates during the washing cycle, thus using the electricity generated during motor braking to power the auxiliary bus capacitor and provide energy to the speed-boosting motor, or to preheat the drying circuit's heating element.

[0053] Specifically, this scheme also includes a bus capacitor 18, which is electrically connected to the IPM circuit. The bus capacitor and the decelerated motor jointly provide power.

[0054] This solution can be applied to twin-tub washing machines. By adding a controllable switch, a three-phase rectifier bridge, and a DC-DC circuit to the motor control circuit of a traditional twin-tub washing machine, the electrical energy generated when one tub decelerates (brakes) can be recovered and used to accelerate the motor of the other tub. Alternatively, during the spin-drying stage, the electrical energy generated when both tubs decelerate (brake) can be recovered and used to preheat the heating components of the drying circuit. This can significantly reduce energy waste and improve the overall energy efficiency of the system.

[0055] During the washing process, by cleverly controlling the motor speeds of the two tubs (one speeding up and the other speeding down), not only can the aforementioned energy recovery and reuse be achieved, but the power distribution throughout the washing process can also be optimized, making the motor work more efficiently and smoothly.

[0056] By reusing electrical energy, the demand for grid power is reduced, thereby lowering the operating costs of the washing machine and making it more economical for users.

[0057] The methods and embodiments provided in this application can be executed on a mobile terminal, computer terminal, or similar computing device. Taking running on a mobile terminal as an example, Figure 3 This is a hardware structure block diagram of a mobile terminal for controlling an energy-saving circuit of a washing and care device according to an embodiment of the present invention. Figure 3 As shown, a mobile terminal may include one or more ( Figure 3 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 3 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 3 The more or fewer components shown, or having the same Figure 3The different configurations shown.

[0058] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the control method of the energy-saving circuit of the washing and care equipment in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the above-described networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or send data via a network. Specific examples of the above-described networks may include wireless networks provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0059] This embodiment provides a control method for an energy-saving circuit of a washing and care device that runs on a mobile terminal, computer terminal, or similar computing device. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Also, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0060] Figure 4 This is a schematic flowchart illustrating the control method of the energy-saving circuit of a washing and care device according to an embodiment of this application. Figure 4 As shown, the method includes the following steps:

[0061] Step S401: Obtain the rotational speed of each of the above motors;

[0062] Specifically, during the operation of the washing machine, the rotational speed of each motor can be monitored in real time, which can be detected by speed sensors or acceleration sensors installed on the motors.

[0063] Step S402: Based on the speed of the motor, determine whether each motor is decelerating or accelerating.

[0064] Specifically, by monitoring changes in motor speed, the operating mode of the motor can be accurately identified, thereby enabling the adoption of effective energy recovery and distribution strategies.

[0065] Step S403: Obtain the preset washing program type currently running on the washing and care equipment, including: washing stage, rinsing stage, and spin-drying stage;

[0066] In step S403, when at least one of the motors is decelerating and at least one of the motors is accelerating, the energy recovery circuit is controlled to connect the multiple motors and disconnect the motors from the drying circuit; or, when at least one motor is decelerating and no motor is accelerating, the energy recovery circuit is controlled to disconnect the multiple motors and connect the motors from the drying circuit.

[0067] Specifically, the energy recovery circuit is rationally configured under different operating conditions. When motor deceleration and acceleration occur simultaneously, the energy recovery circuit will prioritize transferring energy from the deceleration motor to the acceleration motor to achieve internal energy circulation. When the motor decelerates and there is no need for other motors to accelerate, the energy recovery circuit will direct the electrical energy generated by the deceleration motor to the drying circuit to provide energy for its preheating heating components.

[0068] When multiple motors are operating in different states, the recovered energy is directly utilized to improve the performance of the acceleration motor by connecting the circuit between the reduction motor and the acceleration motor, reducing dependence on external power. When all motors are not accelerating, the recovered energy is automatically used for the drying circuit, speeding up the start-up of the drying process, reducing waiting time, and improving capacity utilization.

[0069] Because the rotating drum has high kinetic energy, it undergoes multiple motor decelerations during the washing process. Usually, this energy is wasted as heat, leading to reduced energy efficiency. This embodiment can capture the energy generated by the motor during deceleration and supply it to other motors or the drying circuit. In this way, the motor can be used as a generator during deceleration, recovering and utilizing the energy that would otherwise be lost, thereby improving the energy efficiency of multi-drum washing machines.

[0070] Specifically, the first rotational speed of the motor at the current moment and the second rotational speed at the previous moment are obtained; if the first rotational speed is greater than the second rotational speed, it is determined that the motor is accelerating; if the first rotational speed is less than the second rotational speed, it is determined that the motor is decelerating.

[0071] You can also Figure 4Based on this, a dynamic adjustment method for the energy-saving trigger threshold based on the motor speed difference is provided to improve the response sensitivity and control accuracy of energy recovery. Specifically, after obtaining the motor speed in step S401, the following processing logic is added: 1. Calculate the speed difference Δω = ω_current - ω_previous between the current and previous moments; if Δω < -100 rpm / s, it is determined as "significant deceleration"; if Δω > +100 rpm / s, it is determined as "significant acceleration"; the energy recovery path switching is triggered only when there is both "significant deceleration" and "significant acceleration" demand; 2. At the same time, the system dynamically adjusts the threshold according to the current washing program stage: washing stage: deceleration threshold is set to -100 rpm / s; rinsing stage: deceleration threshold is set to -80 rpm / s (allowing for more sensitive response); spin-drying stage: deceleration threshold is set to -120 rpm / s (preventing false triggering). This method effectively avoids frequent switching actions caused by slight fluctuations, improves system stability, and reduces the wear and tear on switching devices.

[0072] In addition, this solution also includes the following: when the motor load of a certain tub is light (such as when transitioning from washing to rinsing), the power supply of its motor will be automatically reduced, and the excess power will be transferred to the motor of the other tub to balance the power consumption between the two, thereby improving the overall power efficiency.

[0073] The system monitors the load current of each drum motor in a multi-drum washing machine in real time. When a drum motor is detected to be under light load (e.g., below a preset threshold of 10A), a command is sent to the IPM (Integrated Power Management System) to reduce the voltage and frequency input of that motor. Simultaneously, excess voltage and current (assuming 220V / 50Hz) are transferred to the heavier-loaded motor, dynamically balancing energy consumption between the two. By dynamically balancing the energy consumption of different drum motors, energy waste is effectively reduced, especially when the drums operate at inconsistent speeds during washing, thus improving the overall energy efficiency ratio. A balanced power supply reduces excessive motor load, helping to maintain motor health and extend the machine's lifespan.

[0074] In addition, this solution also includes the following: in high-temperature environments (such as when the temperature on a balcony can reach 40°C in summer), the maximum speed of the motor will be automatically limited to reduce the risk of motor overheating. At the same time, the operating parameters of the energy recovery circuit will be optimized to ensure that the electrical energy generated by the deceleration of the motor can be effectively recovered even at high temperatures, avoiding a decrease in energy recovery efficiency due to high temperatures.

[0075] A temperature sensor continuously monitors the ambient temperature outside the washing machine. When the temperature exceeds a preset warning value (e.g., 35°C), the maximum motor speed limit is adjusted (assuming a 10% reduction) to prevent overheating. For the energy recovery circuit, the operating point parameters of the DC-DC converter (e.g., voltage conversion ratio) are adjusted according to the ambient temperature to ensure effective recovery of energy generated by motor deceleration even under high-temperature conditions, preventing a decrease in energy recovery efficiency as the ambient temperature rises. Even in high-temperature environments, by adjusting the motor control strategy and energy recovery circuit parameters, high energy recovery efficiency can still be maintained, reducing energy consumption and improving the washing machine's adaptability to harsh environments. This temperature-sensitive control mechanism reduces the risk of motor overheating in high-temperature environments, ensuring the safe and stable operation of the equipment and avoiding potential safety issues such as fires.

[0076] In specific implementation, when at least one of the aforementioned motors is decelerating and at least one of the aforementioned motors is accelerating, the energy recovery circuit is controlled to connect multiple of the aforementioned motors and to disconnect the connection between the aforementioned motors and the aforementioned drying circuit. Alternatively, when at least one of the aforementioned motors is decelerating and no of the aforementioned motors is accelerating, the energy recovery circuit is controlled to disconnect the connection between multiple of the aforementioned motors and to connect the connection between the aforementioned motors and the aforementioned drying circuit. This can be achieved through the following steps: obtaining the preset washing program of the aforementioned washing and care equipment, wherein the preset washing program includes washing, rinsing, and spin-drying; when at least one of the aforementioned motors is decelerating, at least one of the aforementioned motors is accelerating, and the current washing program of the aforementioned washing and care equipment is washing or rinsing, the energy recovery circuit is controlled to connect multiple of the aforementioned motors and to disconnect the connection between the aforementioned motors and the aforementioned drying circuit. Alternatively, when at least one of the aforementioned motors is decelerating, no of the aforementioned motors is accelerating, and the current washing program of the aforementioned washing and care equipment is spin-drying, the energy recovery circuit is controlled to disconnect the connection between multiple of the aforementioned motors and to connect the connection between the aforementioned motors and the aforementioned drying circuit.

[0077] In this scheme, during the washing or rinsing process, if the electrical energy generated by one motor (such as the motor for the first tub) slows down or stops, it can be absorbed by another motor (such as the motor for the second tub) for acceleration. After dehydration is completed, the drying program needs to be started quickly. At this time, if the electricity generated by one motor (such as the motor for the last dehydration process) slows down, it can be directly supplied to the drying circuit through the energy recovery circuit to accelerate the preheating of the drying circuit, thereby improving the energy utilization efficiency.

[0078] Specifically, the above scheme describes how to adjust the state of the energy recovery circuit according to the motor's operating state (deceleration or acceleration) at different washing stages in order to achieve effective redistribution and utilization of energy.

[0079] Specifically, when at least one of the aforementioned motors is decelerating, at least one of the aforementioned motors is accelerating, and the current washing program of the aforementioned washing and care equipment is the aforementioned washing or rinsing, it is not the final braking; when at least one of the aforementioned motors is decelerating, none of the aforementioned motors is accelerating, and the current washing program of the aforementioned washing and care equipment is the aforementioned spin-drying, it is determined to be the final braking.

[0080] In practical applications, for example, when a dual-tub washer-dryer (washing tub + drying tub) is operating, during the washing or rinsing stage, if the motor in the first tub begins to decelerate (e.g., the speed drops below a preset threshold speed, say 500 rpm), while the motor in the second tub is accelerating (the speed exceeds a preset acceleration threshold, say 800 rpm), then the current conditions are deemed to meet the standards for energy recovery and reuse. At this time, the controllable switch in the energy recovery circuit is adjusted to connect the motor in the first tub to the drying circuit, while disconnecting the second acceleration motor from the drying circuit, ensuring that the electrical energy generated by the decelerated motor directly powers the second acceleration motor. Conversely, during the spin-drying stage, if only one motor decelerates (e.g., at the end of spin-drying), the energy recovery circuit is adjusted to disconnect the connection between the motors, directing the electrical energy generated by the decelerated motor to the drying circuit for preheating the drying heating components. Assuming the preheating voltage required by the drying circuit is 12V, the DC-DC circuit will adjust the output voltage to this level to quickly start the drying program.

[0081] In some embodiments, when at least one of the aforementioned motors is decelerating and at least one of the aforementioned motors is accelerating, the energy recovery circuit is controlled to connect the plurality of the aforementioned motors and to disconnect the aforementioned motors and the aforementioned drying circuit. Specifically, this can be achieved through the following steps: controlling the connection between the aforementioned fixed terminal and the aforementioned first selection terminal to be turned off; controlling the connection between the aforementioned fixed terminal and the aforementioned second selection terminal to be turned on.

[0082] In this scheme, the switch in the energy recovery circuit is adjusted so that the fixed end is connected to the second selection end and the fixed end is disconnected from the first selection end, so as to realize the direct recovery and utilization of energy between the geared motor and the acceleration motor, thereby improving the energy efficiency of the washing machine.

[0083] Specifically, in a twin-tub washer-dryer, when one motor decelerates during the washing phase (e.g., the speed drops below 500 rpm), while the other motor needs to accelerate (e.g., the speed needs to be increased to above 800 rpm), the fixed terminal of the switch connected to both motors in the energy recovery circuit is switched on to the second selector terminal, while the fixed terminal of the switch connected to both motors and the drying circuit is switched off to the first selector terminal. In this way, the electrical energy generated by the deceleration of one motor is directly supplied to the acceleration of the other motor, reducing energy loss during the energy conversion process and preventing energy from being incorrectly allocated to the drying circuit, thus improving the efficiency of energy recovery and the overall energy efficiency of the system.

[0084] In the specific implementation process, when at least one of the above-mentioned motors is decelerating and no of the above-mentioned motors is accelerating, the energy recovery circuit is controlled to shut off the multiple above-mentioned motors, and the energy recovery circuit is controlled to connect the above-mentioned motors and the above-mentioned drying circuit. This can be achieved through the following steps: controlling the connection between the above-mentioned fixed terminal and the above-mentioned first selection terminal; controlling the connection between the above-mentioned fixed terminal and the above-mentioned second selection terminal.

[0085] In this scheme, when there is no need for motor acceleration, the electrical energy generated by the geared motor is directly supplied to the drying circuit, which reduces energy consumption and improves the energy efficiency of the washing machine. In order to ensure that energy does not circulate between motors that do not need acceleration, the connection between the fixed end and the second selection end is turned off, that is, the connection path between multiple motors is cut off.

[0086] Specifically, in a twin-tub washer-dryer, when one tub completes the spin cycle and its motor slows down to a standstill (assuming below 100 rpm), while the other tub's motor does not need to accelerate (maintaining a constant speed or stopping), the following adjustments are made: The fixed terminal of the switch connected to the geared motor is switched on to the first selector terminal (i.e., connected to the drying circuit). This ensures that the electrical energy generated by the motor's deceleration can be directly supplied to the drying circuit for preheating the heating components, for example, by setting the preheating voltage to 24V to quickly reach the required drying temperature. Simultaneously, the fixed terminal of the switch connected to the motor is switched off to the second selector terminal, cutting off the energy flow path between the motors. This avoids ineffective energy circulation when there is no need for motor acceleration, ensuring more precise and efficient energy management for the entire system.

[0087] Specifically, such as Figure 5 As shown, firstly, it is determined whether this is the final brake (the last brake in the dehydration stage). If it is the final brake, then it is determined whether drying is required subsequently. If drying is required subsequently, the first controllable switch 16 disconnects any motor from the IPM and connects any motor to the drying circuit, while the second controllable switch 17 disconnects any motor from the three-phase rectifier bridge and connects the other motor to the drying circuit. Figure 2In the process, S1, S2, S3, S10, S11, and S12 are all switched from pin 3 to pin 1; S4, S5, and S6 are switched to the three-phase input of one of the motors; and S7, S8, and S9 are switched to the three-phase input of the other motor. Then the process ends, and the kinetic energy from the final braking action during the dehydration stage is recovered to generate electricity and supply preheating to the drying components. This allows the drying process to reach the target temperature more quickly. If no further drying is required, the process ends.

[0088] If it is not the final braking, then determine whether the first motor 13 needs to decelerate and the second motor 14 needs to accelerate; if not, the process ends. If the first motor 13 needs to decelerate and the second motor 14 needs to accelerate, then the controllable second switch 17 disconnects the second motor 14 from the three-phase rectifier bridge and connects the first motor 13 to the three-phase rectifier bridge (corresponding to...). Figure 2 Pins S7, S8, and S9 are connected to motor M1, while pins S10, S11, and S12 are all connected to pin 3. Next, the first controllable switch 16 disconnects the IPM from the first motor 13 and connects the IPM to the second motor 14 (S1, S2, and S3 are connected to the IPM, while S4, S5, and S6 are switched to the three-phase input of the second motor 14). The three-phase rectifier bridge rectifies the induced AC voltage in the motor coils. The DC-DC circuit adapts the rectified DC voltage to the range available to the IPM. The bus capacitor C1 and the DC-DC circuit together provide power for the second motor 14 to accelerate. Then the process ends.

[0089] Specifically, this solution is presented using a twin-tub washer-dryer model, but its hardware architecture and control methods can be extended and (partially) applied to multi-tub washing machines, multi-tub washer-dryers, multi-tub dryers, and multi-tub garment care machines. This extension may involve varying the number of controllable switches and motors, both of which fall within the scope of this application.

[0090] This application also provides a control device for an energy-saving circuit of a laundry and care device. It should be noted that the control device for the energy-saving circuit of the laundry and care device in this application can be used to execute the control method for the energy-saving circuit of the laundry and care device provided in this application. This device is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0091] The control device for the energy-saving circuit of the washing and care equipment provided in the embodiments of this application will be described below.

[0092] Figure 6 This is a structural block diagram of the control device for the energy-saving circuit of a washing and care equipment according to an embodiment of this application. Figure 6As shown, the device includes:

[0093] The acquisition unit 100 is used to acquire the rotational speed of each of the above-mentioned motors;

[0094] The determining unit 200 is used to determine whether each of the motors is decelerating or accelerating based on the rotational speed of the motors.

[0095] The control unit 300 is configured to control the energy recovery circuit to connect the plurality of motors and disconnect the motors and the drying circuit when at least one of the motors is decelerating and at least one of the motors is accelerating; or, when at least one of the motors is decelerating and no motors are accelerating, control the energy recovery circuit to disconnect the plurality of motors and connect the motors and the drying circuit.

[0096] Because the rotating drum has high kinetic energy, it undergoes multiple motor decelerations during the washing process. Usually, this energy is wasted as heat, leading to reduced energy efficiency. This embodiment can capture the energy generated by the motor during deceleration and supply it to other motors or the drying circuit. In this way, the motor can be used as a generator during deceleration, recovering and utilizing the energy that would otherwise be lost, thereby improving the energy efficiency of multi-drum washing machines.

[0097] In the specific implementation process, the control unit includes an acquisition module and a first control module. The acquisition module is used to acquire the preset washing program of the washing and care equipment, wherein the preset washing program includes washing, rinsing, and spin-drying. The first control module is used to control the energy recovery circuit to connect multiple motors and disconnect the motors and drying circuit when at least one motor is decelerating, at least one motor is accelerating, and the current washing program of the washing and care equipment is washing or rinsing; or, when at least one motor is decelerating, no motor is accelerating, and the current washing program of the washing and care equipment is spin-drying, control the energy recovery circuit to disconnect multiple motors and connect the motors and drying circuit.

[0098] In this scheme, during the washing or rinsing process, if the electrical energy generated by one motor (such as the motor for the first tub) slows down or stops, it can be absorbed by another motor (such as the motor for the second tub) for acceleration. After dehydration is completed, the drying program needs to be started quickly. At this time, if the electricity generated by one motor (such as the motor for the last dehydration process) slows down, it can be directly supplied to the drying circuit through the energy recovery circuit to accelerate the preheating of the drying circuit, thereby improving the energy utilization efficiency.

[0099] In some embodiments, the control unit includes a second control module and a third control module, wherein the second control module is used to control the shutdown between the fixed terminal and the first selection terminal; and the third control module is used to control the connection between the fixed terminal and the second selection terminal.

[0100] In this scheme, the switch in the energy recovery circuit is adjusted so that the fixed end is connected to the second selection end and the fixed end is disconnected from the first selection end, so as to realize the direct recovery and utilization of energy between the geared motor and the acceleration motor, thereby improving the energy efficiency of the washing machine.

[0101] In the specific implementation process, the control unit includes a fourth control module and a fifth control module. The fourth control module is used to control the conduction between the fixed terminal and the first selection terminal; the fifth control module is used to control the shutdown between the fixed terminal and the second selection terminal.

[0102] In this scheme, when there is no need for motor acceleration, the electrical energy generated by the geared motor is directly supplied to the drying circuit, which reduces energy consumption and improves the energy efficiency of the washing machine. In order to ensure that energy does not circulate between motors that do not need acceleration, the connection between the fixed end and the second selection end is turned off, that is, the connection path between multiple motors is cut off.

[0103] The control device of the energy-saving circuit of the aforementioned washing and care equipment includes a processor and a memory. The aforementioned acquisition unit, determination unit, and control unit are all stored as program units in the memory, and the processor executes the aforementioned program units stored in the memory to realize the corresponding functions. All of the above modules are located in the same processor; or, the above modules are located in different processors in any combination.

[0104] The processor contains a kernel, which retrieves the corresponding program units from memory. One or more kernels can be configured, and adjusting kernel parameters can address the low energy efficiency issue of multi-tub washing machines in existing technologies.

[0105] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0106] This invention provides a computer-readable storage medium including a stored program, wherein, when the program is executed, a control method is provided to control the device containing the computer-readable storage medium to execute the energy-saving circuit of the washing and care device.

[0107] This invention provides a processor for running a program, wherein the program executes a control method for the energy-saving circuit of the washing and care device.

[0108] This invention provides a device including a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it implements at least one step of a control method for the energy-saving circuit of the washing and care device. The device described herein can be a server, PC, PAD, mobile phone, etc.

[0109] This application also provides a computer program product that, when executed on a data processing device, is adapted to perform a control method step of initializing an energy-saving circuit having at least a washing and care device.

[0110] This application also provides a washing and care device, which includes an energy-saving circuit and a control device. The energy-saving circuit is any of the energy-saving circuits of the washing and care device. The control device is electrically connected to the energy-saving circuit and is used to execute the control method of any of the energy-saving circuits of the washing and care device.

[0111] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those described herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0112] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0113] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0114] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0115] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0116] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0117] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0118] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0119] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0120] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0121] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A control method for an energy-saving circuit of a washing and care device, characterized in that, The energy-saving circuit of the laundry equipment includes multiple motors, a drying circuit, and an energy recovery circuit. The multiple motors drive a washing tub, with each washing tub corresponding to one motor. The washing tub is used to wash clothes. The drying circuit converts electrical energy into heat energy to dry the clothes. The energy recovery circuit is electrically connected to both the motors and the drying circuit. The energy recovery circuit is used to switch the multiple motors on or off. It also switches the connection between the motors and the drying circuit. The method involves switching the multiple motors on or off to supply energy from the decelerated motors to the accelerating motors. Obtain the rotational speed of each of the motors; Based on the rotational speed of the motor, determine whether each motor is decelerating or accelerating; When at least one of the motors is decelerating and at least one of the motors is accelerating, the energy recovery circuit is controlled to connect the plurality of motors and disconnect the motors from the drying circuit; or, when at least one of the motors is decelerating and no motors are accelerating, the energy recovery circuit is controlled to disconnect the plurality of motors and connect the motors from the drying circuit.

2. The method according to claim 1, characterized in that, The energy recovery circuit includes: A rectifier bridge circuit has an input terminal and an output terminal. The input terminal of the rectifier bridge circuit is electrically connected to the motor. The rectifier bridge circuit is used to convert the alternating current generated by the motor into direct current. A DC-DC converter circuit has an input terminal and an output terminal, wherein the input terminal of the DC-DC converter circuit and the output terminal of the rectifier bridge circuit are electrically connected. An IPM circuit has an input terminal and an output terminal. The input terminal of the IPM circuit is electrically connected to the output terminal of the DC-DC conversion circuit. The IPM circuit is used to drive the motor or the drying circuit.

3. The method according to claim 1, characterized in that, The energy recovery circuit also includes: Multiple switches, each having a fixed terminal, a first selection terminal, and a second selection terminal, are connected when the fixed terminal and the first selection terminal are connected, and are connected when the fixed terminal and the second selection terminal are connected.

4. The method according to claim 3, characterized in that, The switch is a double-pole double-throw switch.

5. The method according to claim 1, characterized in that, When at least one of the motors is decelerating and at least one of the motors is accelerating, controlling the energy recovery circuit to connect the plurality of motors and control the energy recovery circuit to disconnect the connection between the motors and the drying circuit; or, when at least one of the motors is decelerating and no motor is accelerating, controlling the energy recovery circuit to disconnect the plurality of motors and control the energy recovery circuit to connect the motors and the drying circuit, including: Obtain the preset washing program of the washing and care equipment, wherein the preset washing program includes washing, rinsing, and spin-drying; When at least one of the motors is slowing down, at least one of the motors is accelerating, and the current washing program of the washing and care equipment is washing or rinsing, the energy recovery circuit is controlled to connect the multiple motors and disconnect the motors from the drying circuit. Alternatively, when at least one motor is slowing down, no motor is accelerating, and the current washing program of the washing and care equipment is spin-drying, the energy recovery circuit is controlled to disconnect the multiple motors and connect the motors from the drying circuit.

6. The method according to claim 1, characterized in that, The energy recovery circuit further includes multiple switches, each having a fixed terminal, a first selection terminal, and a second selection terminal. When the fixed terminal and the first selection terminal are connected, the motor and the drying circuit are connected; when the fixed terminal and the second selection terminal are connected, the multiple motors are connected. When at least one motor is decelerating and at least one motor is accelerating, controlling the energy recovery circuit to connect the multiple motors and controlling the energy recovery circuit to disconnect the connection between the motors and the drying circuit includes: The connection between the fixed terminal and the first selection terminal is turned off. Control the connection between the fixed end and the second selection end.

7. The method according to claim 6, characterized in that, When at least one of the motors is decelerating and none of the motors is accelerating, controlling the energy recovery circuit to shut down the plurality of motors and controlling the energy recovery circuit to connect the motors and the drying circuit includes: Control the connection between the fixed end and the first selection end; The connection between the fixed terminal and the second selection terminal is turned off.

8. A control device for an energy-saving circuit of a washing and care equipment, characterized in that, The energy-saving circuit of the laundry equipment includes multiple motors, a drying circuit, and an energy recovery circuit. The multiple motors drive a washing tub, with each washing tub corresponding to one motor. The washing tub is used to wash clothes. The drying circuit converts electrical energy into heat energy to dry the clothes. The energy recovery circuit is electrically connected to both the motors and the drying circuit. The energy recovery circuit is used to switch the multiple motors on or off. It also switches the connection between the motors and the drying circuit. The device allows energy from the decelerated motors to be supplied to the accelerating motors by switching the multiple motors on or off. An acquisition unit is used to acquire the rotational speed of each of the motors; A determining unit is configured to determine, based on the rotational speed of the motor, whether each of the motors is decelerating or accelerating; A control unit is configured to control the energy recovery circuit to connect the plurality of motors and disconnect the motors and the drying circuit when at least one of the motors is decelerating and at least one of the motors is accelerating; or, when at least one of the motors is decelerating and no motor is accelerating, control the energy recovery circuit to disconnect the plurality of motors and connect the motors and the drying circuit.

9. A washing and care device, characterized in that, The washing and care equipment includes: Energy-saving circuits; A control device, electrically connected to the energy-saving circuit, the control device being used to execute the control method of the energy-saving circuit of the washing and care equipment according to any one of claims 1 to 7.

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