Power supply control circuit for a household appliance and control method of a household appliance

Abstract

The application discloses a power supply control circuit for a household appliance and a control method of the household appliance. The power supply control circuit for the household appliance comprises a relay, which is arranged in a main power supply circuit of the household appliance, and an input end of the relay is adapted to be connected to a first output end of an external power supply; a switching power supply unit, a first end of the switching power supply unit is adapted to be connected to a second output end of the external power supply, a second end of the switching power supply unit is connected to an output end of the relay, a first power output end of the switching power supply is adapted to be connected to a rear-end load of the household appliance, and the switching power supply unit is used for supplying power to the household appliance when the household appliance is in a working state; a rechargeable battery, which is connected to the switching power supply unit and a power supply end of the relay, and is used for supplying power to the household appliance when the household appliance is in a standby state; and a control unit. The power supply control circuit can effectively reduce standby power consumption of the household appliance and improve comprehensive energy efficiency and energy saving level.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and in particular to a power supply control circuit and a control method for household appliances. Background Technology

[0002] With the development of battery technology, rechargeable batteries have been increasingly used and are now found in a wide variety of products used in daily life, especially in home appliances. Meanwhile, as governments worldwide impose increasingly stringent requirements on green and energy-efficient products, comprehensive energy efficiency is being adopted more and more frequently. While standby power consumption may seem insignificant in comprehensive energy efficiency, its cumulative effect is substantial and it accounts for a large proportion of overall energy consumption. Therefore, reducing standby power consumption has become a priority for effectively reducing overall energy consumption. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide a power supply control circuit for household appliances, which can effectively reduce the standby power consumption of household appliances and improve overall energy efficiency.

[0004] The second objective of this invention is to provide a method for controlling household appliances.

[0005] To address the aforementioned problems, a first aspect of the present invention provides a power supply control circuit for a household appliance, comprising: a relay disposed in the main power supply circuit of the household appliance, the input terminal of the relay being adapted to connect to a first output terminal of an external power source; a switching power supply unit, the first terminal of the switching power supply unit being adapted to connect to a second output terminal of the external power source, the second terminal of the switching power supply unit being connected to the output terminal of the relay, the first power output terminal of the switching power supply unit being adapted to connect to a downstream load of the household appliance, the switching power supply unit being used to supply power to the household appliance when the household appliance is in an operating state; a rechargeable battery, the rechargeable battery being connected to the power supply terminals of the switching power supply unit and the relay, and being used to supply power to the household appliance when the household appliance is in a standby state; and a control unit, the control unit being connected to the control terminal of the relay, the switching power supply unit, and the rechargeable battery, the control unit being configured to switch the power supply mode of the household appliance according to the operating state of the household appliance.

[0006] According to an embodiment of the present invention, a power supply control circuit for household appliances, when the household appliance is in working condition, controls the closing of a relay through a control unit to turn on a switching power supply unit, thereby controlling the household appliance to switch to external power supply mode, so that the external power supply supplies power to the household appliance. When the household appliance is in standby mode, controls the opening of a relay through a control unit to control the household appliance to switch to rechargeable battery power supply mode, so that the rechargeable battery supplies power to the household appliance. Thus, without affecting the normal use of the household appliance by the user, by using a rechargeable battery as a backup power supply for the household appliance in standby mode, the zero-watt standby power consumption of the household appliance is effectively achieved. Especially for low-power household appliances, this reduces the self-power consumption of the household appliance and improves the overall energy efficiency and energy saving level of the household appliance.

[0007] In some embodiments, the output terminal of the relay and the second output terminal of the external power supply are respectively connected to the back-end load of the household appliance.

[0008] In some embodiments, the device further includes a diode, the anode of which is connected to a second power output terminal of the switching power supply unit, and the cathode of which is connected to the rechargeable battery and the control unit.

[0009] In some embodiments, the system further includes a manual switch connected in parallel with the relay.

[0010] In some embodiments, the power supply control circuit further includes: a first voltage detection unit connected to the control unit, the first voltage detection unit being used to detect a first voltage value across the rechargeable battery; a second voltage detection unit connected to the control unit, the second voltage detection unit being used to detect a second voltage value output by the switching power supply unit; the control unit is further configured to: determine the connection state between the household appliance and the external power supply based on the second voltage value; and control the charging state of the rechargeable battery based on the connection state, the operating state of the household appliance, and the first voltage value.

[0011] In some embodiments, the power supply control circuit further includes a current detection unit connected to the control unit, the current detection unit being used to detect the charging and discharging current value of the rechargeable battery; the control unit is further configured to determine the fault state of the rechargeable battery based on the first voltage value and the charging and discharging current value.

[0012] In some embodiments, the power supply control circuit further includes a temperature detection unit connected to the control unit, the temperature detection unit being used to detect the real-time temperature of the rechargeable battery; the control unit is further configured to determine the charge / discharge state of the rechargeable battery based on the real-time temperature.

[0013] A second aspect of the present invention provides a control method for a household appliance, used in the power supply control circuit for a household appliance described in the above embodiments. The control method includes: acquiring the operating state of the household appliance, wherein the operating state includes a working state and a standby state; and controlling the power supply mode of the household appliance according to the operating state of the household appliance.

[0014] According to the control method for household appliances of the present invention, when the household appliance is in working state, the control unit controls the closing of the relay to turn on the switching power supply unit, thereby controlling the household appliance to switch to external power supply mode, so that the external power supply supplies power to the household appliance. When the household appliance is in standby state, the control unit controls the relay to open, controlling the household appliance to switch to rechargeable battery power supply mode, so that the rechargeable battery supplies power to the household appliance. Thus, without affecting the normal use of the household appliance by the user, by using the rechargeable battery as a backup power supply for the household appliance in standby state, the zero-watt standby power consumption of the household appliance is effectively achieved. Especially for low-power household appliances, this reduces the power consumption of the household appliance itself and improves the overall energy efficiency and energy saving level of the household appliance.

[0015] In some embodiments, the method further includes: acquiring a first voltage value across the rechargeable battery in the household appliance, and acquiring a second voltage value output by the switching power supply unit in the household appliance; determining the connection state between the household appliance and an external power source based on the second voltage value; and controlling the charging state of the rechargeable battery in the household appliance based on the connection state, the operating state of the household appliance, and the first voltage value.

[0016] In some embodiments, the method further includes: acquiring the charge / discharge current value of the rechargeable battery; and determining the fault state of the rechargeable battery based on the first voltage value and the charge / discharge current value.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1This is a circuit connection diagram of a power supply control circuit for a household appliance according to an embodiment of the present invention;

[0020] Figure 2 This is a circuit connection diagram of a power supply control circuit for a household appliance according to an embodiment of the present invention;

[0021] Figure 3 This is a circuit connection diagram of a manual switch according to an embodiment of the present invention;

[0022] Figure 4 This is a control flowchart of a control unit according to an embodiment of the present invention;

[0023] Figure 5 This is a structural block diagram of a power supply control circuit for a household appliance according to an embodiment of the present invention;

[0024] Figure 6 This is a control flowchart of a control unit according to another embodiment of the present invention;

[0025] Figure 7 This is a control flowchart of a control unit according to another embodiment of the present invention;

[0026] Figure 8 This is a flowchart of a method for controlling a household appliance according to an embodiment of the present invention;

[0027] Figure 9 This is a flowchart of a method for controlling a household appliance according to another embodiment of the present invention;

[0028] Figure 10 This is a flowchart of a method for controlling a household appliance according to another embodiment of the present invention.

[0029] Figure label:

[0030] Power supply control circuit 10;

[0031] 1: Switching power supply unit; 2: Rechargeable battery; 3: Control unit; K2: Relay; D01: Diode; SW: Manual switch; 4: First voltage detection unit; 5: Second voltage detection unit; 6: Current detection unit; 7: Temperature detection unit. Detailed Implementation

[0032] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0033] To address the aforementioned problems, a first aspect of the present invention provides a power supply control circuit 10 for household appliances. Using this power supply control circuit for household appliances can effectively reduce the standby power consumption of household appliances and improve the overall energy efficiency level.

[0034] The following is for reference. Figure 1 A power supply control circuit 10 for a household appliance according to an embodiment of the present invention is described, such as... Figure 1 As shown, the power supply control circuit 10 includes a relay K2, a switching power supply unit 1, a rechargeable battery 2, and a control unit 3.

[0035] Among them, relay K2 is located in the main power supply circuit of the household appliance, and the input terminal of relay K2 is adapted to connect to the first output terminal X1 of the external power supply; the first terminal of the switching power supply unit 1 is adapted to connect to the second output terminal X2 of the external power supply, the second terminal of the switching power supply unit 1 is connected to the output terminal of relay K2, and the first power output terminal of the switching power supply unit 1 is adapted to connect to the downstream load of the household appliance. The switching power supply unit 1 is used to supply power to the household appliance when it is in working state; the rechargeable battery 2 is connected to the power supply terminals of the switching power supply unit 1 and relay K2, and is used to supply power to the household appliance when it is in standby state; the control unit 3 is connected to the control terminal of relay K2, the switching power supply unit 1, and the rechargeable battery 2. The control unit 3 is configured to switch the power supply mode of the household appliance according to the operating state of the household appliance.

[0036] Specifically, refer to Figure 1 As shown, relay K2 is a normally open relay. Relay K2 is located in the main power supply circuit of the household appliance. The input terminal of relay K2 is connected to the first output terminal X1 of the external power supply, and the output terminal of relay K2 is connected to the second terminal of the switching power supply unit 1. Since the first terminal of the switching power supply unit 1 is connected to the second output terminal X2 of the external power supply, and the first power output terminal of the switching power supply unit 1 is suitable for connecting to the downstream load of the household appliance, the switching power supply unit 1 converts the AC power provided by the external power supply into DC power. Then, by connecting the first power output terminal of the switching power supply unit 1 to the downstream load of the household appliance, the switching power supply unit 1 provides DC power to the downstream load of the household appliance that requires DC power through the first power output terminal SUPPLY. Therefore, through the above circuit design, the relay K2 controls the on / off switching of the mains power supply to the downstream load.

[0037] Based on this, when the household appliance is in operation, the control unit 3 controls the relay K2 to close, and the switching power supply unit 1 connects to an external power source to control the household appliance to switch to external power supply mode. This allows the switching power supply unit 1 to provide DC power to the downstream load of the household appliance. At the same time, since the rechargeable battery 2 is connected to the switching power supply unit 1, the external power source will also charge the rechargeable battery 2, so that the rechargeable battery 2 can reach full charge when it is powered on. When the household appliance is in standby mode, the control unit 3 controls the relay K2 to open, that is, the control unit 3 disconnects the control terminal of the relay K2, so that the relay K2 is in the normally open state, and disconnects the power supply to the downstream load of the household appliance, so that the input power of the entire household appliance is zero. At the same time, the control unit 3 controls the household appliance to switch to the power supply mode of the rechargeable battery 2, so that the rechargeable battery 2 supplies power to the electrical control units that must operate in the household appliance, such as the control unit 3, so as to keep them running and reduce power consumption. Therefore, without affecting the normal use of household appliances, by using rechargeable battery 2 as a backup power source for household appliances in standby mode, zero-watt standby power consumption of household appliances can be effectively achieved, reducing the power consumption of household appliances themselves and improving the overall energy efficiency of household appliances.

[0038] In an embodiment, such as Figure 1 As shown, the power supply control circuit 10 also includes a variable resistor RT1. One end of the variable resistor RT1 is connected to an external power supply, and the other end is connected to the input terminal of the relay K2. Therefore, since the current supplied by the external power supply varies, resulting in different parameters for the power supply control circuit 10, the maximum current input from the external power supply is limited by setting the variable resistor RT1.

[0039] In an embodiment, such as Figure 1 As shown, the control unit 3 may include an on / off control unit and a charging control unit. Thus, the charging and discharging control of the rechargeable battery 2 is achieved through the charging control unit or the on / off control unit. When mains power is supplied and the household appliance is in operation, the control unit 3 controls the on / off control unit to be in the off state, and the rechargeable battery 2 does not supply power to the control unit 3. When mains power is supplied and the household appliance is in standby mode, the control unit 3 controls the on / off control unit to be in the on state, and the rechargeable battery 2 supplies power to the control unit 3 through the on / off control unit. Alternatively, when mains power is supplied and the household appliance is in operation, the control unit 3 controls the charging control unit to supply power to the rechargeable battery 2, and when mains power is supplied and the household appliance is in standby mode, the control unit 3 controls the charging control unit to stop supplying power to the rechargeable battery 2.

[0040] In some embodiments, the power supply control circuit 10 is applicable to low-power household appliances, such as kettles, humidifiers, rice cookers, or microwave ovens, and there are no restrictions on this.

[0041] According to an embodiment of the present invention, the power supply control circuit 10 for household appliances, when the household appliance is in working condition, controls the closing of relay K2 through control unit 3 to turn on the switching power supply unit, thereby controlling the household appliance to switch to external power supply mode, so that the external power supply supplies power to the household appliance. When the household appliance is in standby mode, controls the opening of relay K2 through control unit 3 to control the household appliance to switch to rechargeable battery 2 power supply mode, so that the rechargeable battery 2 supplies power to the household appliance. Thus, without affecting the normal use of the household appliance by the user, by using rechargeable battery 2 as a backup power supply for the household appliance in standby mode, the zero-watt standby power consumption of the household appliance is effectively achieved. Especially for low-power household appliances, this reduces the power consumption of the household appliance itself and improves the overall energy efficiency of the household appliance.

[0042] In some embodiments, such as Figure 2 The power supply control circuit 10 for household appliances shown has the output terminal of relay K2 and the second output terminal of the external power supply connected to the downstream load of the household appliances, respectively. Since different household appliances require different currents for their downstream loads (i.e., the downstream loads of household appliances can require AC current), the external power supply is connected to the downstream load of the household appliances, and relay K2 is connected between the external power supply and the downstream load. Thus, through the above circuit design, relay K2 controls the on / off switching of AC power to the downstream load. When the household appliance is connected to the external power supply and is in operation, the control unit 3 controls relay K2 to close, allowing the downstream load to access the external power supply, enabling the external power supply to directly provide AC power to the downstream load of the household appliances that require AC power. When the household appliance is in standby mode, the control unit 3 controls relay K2 to open, disconnecting the power supply to the downstream load of the household appliance. Simultaneously, the switching power supply unit 1 outputs DC power through the first power output terminal SUPPLY to provide DC power to the downstream load within the household appliance.

[0043] In some embodiments, such as Figure 1 As shown, the power supply control circuit 10 also includes a diode D01. The anode of diode D01 is connected to the second power output terminal of the switching power supply unit 1, and the cathode of diode D01 is connected to the rechargeable battery 2 and the control unit 3. Therefore, when the rechargeable battery 2 supplies power to the control unit 3, the diode D01 effectively prevents the rechargeable battery 2 from supplying reverse power to other units connected to the second power output terminal Vcc of the switching power supply unit 1, thereby further reducing the power consumption of the rechargeable battery 2 and increasing its standby time.

[0044] In some embodiments, such as Figure 3As shown, the power supply control circuit 10 also includes a manual switch SW. The manual switch SW is connected in parallel with the relay K2. Therefore, based on the setting of the manual switch SW, when it is determined that the rechargeable battery 2 has too low a charge to start the household appliance, the user can actively close the manual switch SW, thereby forcing power supply to the downstream load of the household appliance. Simultaneously, this causes the switching power supply unit 1 to start working and charge the rechargeable battery 2, enabling the household appliance to restart smoothly.

[0045] In some embodiments, such as Figure 1 and Figure 2 As shown, the power supply control circuit 10 also includes: a first voltage detection unit 4 and a second voltage detection unit 5.

[0046] The first voltage detection unit 4 is connected to the control unit 3 and is used to detect the first voltage value at both ends of the rechargeable battery 2; the second voltage detection unit 5 is connected to the control unit 3 and is used to detect the second voltage value output by the switching power supply unit 1.

[0047] like Figure 4 As shown, the control unit 3 is also configured to perform the following steps.

[0048] Step S11: Determine the connection status between the household appliance and the external power source based on the second voltage value.

[0049] Specifically, the second voltage value output by the switching power supply unit 1 is used to power the control unit 3. If the second voltage value output by the switching power supply unit 1 is lower than the first preset voltage value, it can be determined that the mains power is cut off, that is, the connection status between the household appliance and the external power supply is disconnected; conversely, if the second voltage value output by the switching power supply unit 1 is higher than the first preset voltage value, it can be determined that the mains power is supplied, that is, the connection status between the household appliance and the external power supply is connected. The first preset voltage value is a positive value that is greater than zero and approaches zero.

[0050] Step S12: Control the charging state of the rechargeable battery 2 according to the connection status, the operating status of the household appliance and the first voltage value.

[0051] Specifically, when the household appliance is connected to the external power source and is in operation, if the detected first voltage value is greater than or equal to the second preset voltage value, it indicates that the rechargeable battery 2 is fully charged. At this time, the control unit 3 controls the charging state of the rechargeable battery 2 to stop charging, that is, the control unit 3 will stop charging the rechargeable battery 2 through the charging control unit 3. If the detected first voltage value is less than or equal to the third preset voltage value, it indicates that the rechargeable battery 2 needs to be recharged. At this time, the control unit 3 controls the charging state of the rechargeable battery 2 to charge, that is, the control unit 3 will charge the rechargeable battery 2 through the charging control unit 3 until the first voltage value is greater than or equal to the second preset voltage value. Then, the control unit 3 controls the charging state of the rechargeable battery 2 to stop charging. This control ensures the safe and stable charging of the rechargeable battery 2, avoids overcharging, and ensures that the rechargeable battery 2 maintains a high charge level under mains power supply, so that there is sufficient power to provide power when the household appliance is in standby mode.

[0052] In addition, when the household appliance is connected to the external power source and is in operation, trickle charging can be used, which means that the charging current is very small, generally less than 100mA, thereby reducing the burden on the switching power supply unit 1 and improving the reliability and lifespan of the rechargeable battery 22.

[0053] Alternatively, when the household appliance is connected to an external power source and is in standby mode, the voltage across the rechargeable battery 2 will gradually decrease because the battery is discharging. When the first detected voltage value is less than or equal to the preset charging voltage threshold, it indicates that the rechargeable battery 2 is almost depleted and needs to be charged. At this time, the control unit 3 controls the charging state of the rechargeable battery 2 to be charging. That is, the control unit 3 controls the relay K2 to be closed, and the switching power supply unit 1 is in the power supply state. At the same time, the control unit 3 is controlled to enter the charging state, and the switching power supply unit 1 outputs power to supply the control unit 3 and the rechargeable battery 2. This continues until the first detected voltage value is greater than or equal to the second preset voltage value. Then, it is determined that the rechargeable battery 2 is fully charged, and the control unit 3 controls the charging state of the rechargeable battery 2 to stop charging. At the same time, the control unit 3 disconnects the control of the relay K2, making the relay K2 normally open, disconnecting the power supply to the downstream load, so that the input power of the entire household appliance is zero, reducing the power consumption of the household appliance itself.

[0054] In some embodiments, when the household appliance is in standby mode, the switching power supply unit 1 can ensure that it provides sufficient capacity to charge the rechargeable battery 2, and can also perform high-current charging to improve the conversion efficiency of the switching power supply unit 1 throughout the charging process and achieve fast charging.

[0055] Alternatively, when the connection between the household appliance and the external power source is disconnected, i.e., the mains power is off, if the detected first voltage value is less than or equal to the preset charging voltage threshold, it indicates that the rechargeable battery 2 is essentially depleted. Since an external power source cannot be connected to charge the rechargeable battery 2, the control unit 3 can only control the charging state of the rechargeable battery 2 to stop charging. In some embodiments, for the above situation, the control unit 3 can remind the user through an audible alarm or a visual alarm, so that the user can charge the rechargeable battery 2 in a timely manner, such as by removing the rechargeable battery 2 for separate charging, or by connecting the household appliance to the external power source to power the entire household appliance.

[0056] Furthermore, when the household appliance is disconnected from the external power source, the rechargeable battery 2 will be continuously used for standby operation, consuming its power. When the first voltage value across the rechargeable battery 2 reaches the minimum allowable operating voltage, it needs to be recharged. However, at this time, the household appliance is without mains power, causing the rechargeable battery 2 to be unable to replenish its power in time and continue to consume its stored power. To avoid the rechargeable battery 2 being completely depleted due to continuous power consumption, which would affect its reusable lifespan and also prevent the mains power from closing the relay K2 properly, thus preventing the appliance from starting normally, the control unit 3 will remind the user to intervene.

[0057] In some embodiments, to avoid excessive consumption of the rechargeable battery 2, when there is no mains power supply, i.e. the connection between the household appliance and the external power source is disconnected, after the control unit 3 controls the relay K2 to close, if it is detected that the state is still no mains power supply, the relay K2 is disconnected again, and after a fixed delay T, the above process is repeated again, and the cycle continues.

[0058] In some embodiments, such as Figure 4 As shown, the power supply control circuit 10 also includes a current detection unit 6, which is connected to the control unit 3. The current detection unit 6 is used to detect the charging and discharging current value of the rechargeable battery 2. The control unit 3 is also configured to determine the fault state of the rechargeable battery 2 based on the first voltage value and the charging and discharging current value.

[0059] Specifically, refer to Figure 6 The process of determining the fault state of rechargeable battery 2 is illustrated with an example, and the specific steps are as follows.

[0060] Step S21: Monitor the first voltage value and the charging / discharging current value across the rechargeable battery. The charging / discharging current value includes the charging current value and the discharging current value of the rechargeable battery.

[0061] Step S22: Determine whether the discharge current value of the rechargeable battery is greater than the first preset current value. If so, proceed to step S23. The first preset current value is greater than zero.

[0062] Step S23: The fault state of rechargeable battery 2 is determined to be an over-discharge fault. At this time, the control unit 3 performs over-discharge protection, reports the battery over-discharge fault, and starts the external power supply to provide power.

[0063] Step S24: Determine whether the charging current value of the rechargeable battery is greater than the second preset current value. If so, proceed to step S25. The second preset current value is greater than zero.

[0064] Step S25: The fault state of rechargeable battery 2 is determined to be overcharge fault. At this time, control unit 3 performs overcharge protection, reports battery overcharge fault, and starts external power supply to provide power.

[0065] Step S26: Determine whether the first voltage value of the rechargeable battery is greater than the fourth preset voltage value. If so, proceed to step S27. The fourth preset voltage value is greater than zero.

[0066] Step S27: The fault state of rechargeable battery 2 is determined to be an overvoltage fault. At this time, control unit 3 performs overvoltage protection, reports the battery overvoltage fault, stops charging rechargeable battery 2, and controls rechargeable battery 2 to supply power to control unit 3 until the first voltage value of rechargeable battery 2 drops to the fifth preset voltage value, at which point the overvoltage protection is exited. Wherein, the fourth preset voltage value > the fifth preset voltage value > 0.

[0067] Step S28: Determine whether the first voltage value of the rechargeable battery is less than the sixth preset voltage value. If so, proceed to step S29. The sixth preset voltage value is greater than zero.

[0068] Step S29: The fault state of rechargeable battery 2 is determined to be low voltage fault. At this time, control unit 3 performs low voltage protection and reports the battery low voltage fault.

[0069] Therefore, by monitoring the charging and discharging current value of the rechargeable battery 2 and the first voltage value at its two ends, this application realizes the over-discharge protection function, overcharge protection function, overvoltage protection function and undervoltage protection function of the rechargeable battery 2, so as to avoid damage to the rechargeable battery 2 due to overload of the downstream load circuit, short circuit fault, charging circuit fault and switching power supply unit 1 fault, and ensure that the rechargeable battery 2 can work safely, reliably, stably and for a long time, thereby improving the service life of the rechargeable battery 2.

[0070] In some embodiments, such as Figure 5As shown, the power supply control circuit 10 also includes a temperature detection unit 7. The temperature detection unit 7 is connected to the control unit 3 and is used to detect the real-time temperature of the rechargeable battery 2. For example, the temperature detection unit 7 can be installed on the surface of the rechargeable battery 2 to facilitate monitoring of its real-time temperature.

[0071] Control unit 3 is also configured to determine the charge / discharge state of rechargeable battery 2 based on real-time temperature, as detailed below. Figure 7 As shown.

[0072] Step S30: Detect the real-time temperature of the rechargeable battery 2.

[0073] Step S31: Determine whether the detected real-time temperature is higher than the first preset temperature value. If yes, proceed to step S32; otherwise, the rechargeable battery 2 will perform normal charging and discharging operations.

[0074] In step S32, the control unit 3 controls the charging and discharging state of the rechargeable battery 2 to stop charging, and simultaneously reports an overheat protection fault. The control unit 3 will continue charging the rechargeable battery 2 once the detected real-time temperature drops to the second preset temperature value. Here, the first preset temperature value > the second preset temperature value > 0.

[0075] In addition, in trickle charging mode, if the control unit 3 still detects that the real-time temperature of the rechargeable battery 2 is higher than the first preset temperature value or the real-time temperature of the rechargeable battery 2 is higher than the first preset temperature value in the discharge state, the control unit 3 reports a battery damage fault and stops working.

[0076] In this embodiment, when a battery failure occurs, the control unit 3 will not charge or discharge the rechargeable battery 2, and the user can turn on the household appliance via the manual switch SW shown in the figure.

[0077] A second aspect of the present invention provides a control method for a household appliance, used in the power supply control circuit for the household appliance described in the above embodiments, such as... Figure 8 As shown, the control method includes the following steps.

[0078] Step S1: Obtain the operating status of the household appliances, including the working status and the standby status.

[0079] Step S2: Control the power supply mode of the household appliances according to their operating status.

[0080] Specifically, based on Figure 1The power supply control circuit shown is for a household appliance. When the appliance is in operation, the control unit controls the relay to close, and the switching power supply unit connects to an external power source. This switches the appliance to external power supply mode, allowing the switching power supply unit to provide DC power to the appliance's downstream loads. Simultaneously, because the rechargeable battery is connected to the switching power supply unit, the external power source also charges the rechargeable battery, ensuring it reaches full charge when the appliance is powered. When the appliance is in standby mode, the control unit controls the relay to open, meaning the control unit disconnects control of the relay's control terminal, keeping the relay normally open and disconnecting power to the appliance's downstream loads. This reduces the appliance's input power to zero. Simultaneously, the appliance switches to rechargeable battery power supply mode, allowing the rechargeable battery to power essential electronic control units within the appliance, such as the control unit, to maintain operation and reduce power consumption. Therefore, without affecting the normal use of household appliances, by using rechargeable batteries as backup power for low-power household appliances in standby mode, zero-watt standby power consumption of household appliances can be effectively achieved, reducing the power consumption of household appliances themselves and improving the overall energy efficiency of household appliances.

[0081] According to the control method for household appliances of the present invention, when the household appliance is in working state, the control unit controls the closing of the relay to turn on the switching power supply unit, thereby controlling the household appliance to switch to external power supply mode, so that the external power supply supplies power to the household appliance. When the household appliance is in standby state, the control unit controls the relay to open, controlling the household appliance to switch to rechargeable battery power supply mode, so that the rechargeable battery supplies power to the household appliance. Thus, without affecting the normal use of the household appliance by the user, by using the rechargeable battery as a backup power supply for the household appliance in standby state, the zero-watt standby power consumption of the household appliance is effectively achieved. Especially for low-power household appliances, this reduces the power consumption of the household appliance itself and improves the overall energy efficiency and energy saving level of the household appliance.

[0082] In some embodiments, such as Figure 9 As shown, the method also includes the following steps.

[0083] Step S3: Obtain the first voltage value across the rechargeable battery inside the household appliance, and obtain the second voltage value output by the switching power supply unit inside the household appliance.

[0084] Step S4: Determine the connection status between the household appliance and the external power source based on the second voltage value.

[0085] Specifically, the second voltage value output by the switching power supply unit is used to power the control unit. If the second voltage value output by the switching power supply unit is lower than the first preset voltage value, it can be determined that the mains power is cut off, that is, the connection status between the household appliance and the external power supply is disconnected; conversely, if the second voltage value output by the switching power supply unit is higher than the first preset voltage value, it can be determined that the mains power is supplied, that is, the connection status between the household appliance and the external power supply is connected. The first preset voltage value is a positive value that is greater than zero and approaches zero.

[0086] Step S5: Control the charging state of the rechargeable battery inside the household appliance based on the connection status, the operating status of the household appliance, and the first voltage value.

[0087] Specifically, when the household appliance is connected to an external power source and is running, if the detected first voltage value is greater than or equal to the second preset voltage value, it indicates that the rechargeable battery is fully charged. At this time, the control unit stops the charging of the rechargeable battery. If the detected first voltage value is less than or equal to the third preset voltage value, it indicates that the rechargeable battery needs additional charging. At this time, the control unit charges the rechargeable battery until the first voltage value is greater than or equal to the second preset voltage value. Then, the control unit stops the charging of the rechargeable battery. This control ensures the safe and stable charging of the rechargeable battery, avoids overcharging, and ensures that the rechargeable battery maintains a high charge level under mains power supply, so that there is sufficient power to supply the household appliance when it is in standby mode.

[0088] Alternatively, when the household appliance is connected to an external power source and is in standby mode, the rechargeable battery is discharging, and the voltage across the battery terminals gradually decreases. When the detected first voltage value is less than or equal to a preset charging voltage threshold, it indicates that the rechargeable battery is almost depleted and needs to be recharged. At this point, the control unit controls the rechargeable battery to charge, meaning the control unit controls the relay to close, putting the switching power supply unit in a power-supply state. Simultaneously, the control unit is also put into charging mode, and the switching power supply unit outputs power to the control unit and the rechargeable battery. This continues until the detected first voltage value is greater than or equal to a second preset voltage value, at which point the rechargeable battery is considered fully charged. The control unit then stops charging the battery and disconnects the control of the relay, putting the relay in a normally open state, disconnecting the power supply to the downstream load, thus reducing the input power of the entire household appliance to zero and minimizing its own power consumption.

[0089] Alternatively, when the household appliance is disconnected from the external power source (i.e., the mains power is off), if the detected first voltage value is less than or equal to a preset charging voltage threshold, it indicates that the rechargeable battery is essentially depleted. Since an external power source cannot be connected to charge the rechargeable battery, the control unit can only stop the charging process. In some embodiments, for the above situation, the control unit can alert the user through audible or visual alarms, allowing the user to charge the rechargeable battery promptly. This could be achieved by removing the rechargeable battery for separate charging or by connecting the household appliance to the external power source to power the entire appliance.

[0090] In some embodiments, the method further includes acquiring the charge / discharge current value of the rechargeable battery and determining the fault state of the rechargeable battery based on the first voltage value and the charge / discharge current value, thereby ensuring that the rechargeable battery can operate safely, reliably, stably, and for a long time, and improving the service life of the rechargeable battery.

[0091] The following is for reference. Figure 1 and Figure 10 The control method for household appliances described in this application is illustrated with an example, and the specific steps are as follows.

[0092] Step S33: Control the charging and discharging of the rechargeable battery.

[0093] Step S34: Detect the second voltage value output by the switching power supply unit.

[0094] Step S35: Determine whether the second voltage value is less than the first preset voltage value. If not, proceed to step S36; if yes, proceed to step S38.

[0095] Step S36: Charge the rechargeable battery.

[0096] Step S37: A shutdown command is received.

[0097] In step S38, the household appliance enters standby mode, and the control relay is disconnected.

[0098] Step S39: Control the rechargeable battery to discharge in order to power household appliances.

[0099] Step S40: Detect the first voltage value at both ends of the rechargeable battery.

[0100] Step S41: Determine whether the first voltage value is lower than the third preset voltage value. If yes, proceed to step S42; otherwise, proceed to step S39.

[0101] Step S42: Perform compensating charging on the rechargeable battery.

[0102] Step S43: Control the relay to close.

[0103] Step S44: Determine whether the first voltage value is higher than the second preset voltage value. If yes, proceed to step S45; otherwise, proceed to step S43.

[0104] Step S45: Control the relay to disconnect.

[0105] In summary, the control method for household appliances according to embodiments of the present invention, based on the rechargeable battery, charges the rechargeable battery when the household appliance is in operation. This improves the conversion efficiency during charging and ensures the rechargeable battery is fully charged before the household appliance enters standby mode. This allows the rechargeable battery to provide low-voltage power to the control unit and necessary human-machine interface within the household appliance when it enters standby mode, while simultaneously cutting off power to all other downstream loads within the household appliance. This completely eliminates power consumption generated by downstream loads in standby mode, achieving near-zero standby power consumption. Furthermore, this application also allows for periodic charging of the rechargeable battery to replenish energy while the household appliance is in standby mode.

[0106] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0107] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A power supply control circuit for household appliances, characterized in that, include: A relay, wherein the relay is installed in the main power supply circuit of a household appliance, and the input terminal of the relay is adapted to connect to the first output terminal of an external power source; A switching power supply unit, wherein a first end of the switching power supply unit is adapted to be connected to a second output end of an external power supply, the second end of the switching power supply unit is connected to the output end of the relay, and the first power output end of the switching power supply is adapted to be connected to the downstream load of the household appliance. The switching power supply unit is used to supply power to the household appliance when the household appliance is in working condition. A rechargeable battery is connected to the power supply terminal of the switching power supply unit and the relay, and is used to supply power to the household appliance when the household appliance is in standby mode; A control unit is connected to the control terminal of the relay, the switching power supply unit, and the rechargeable battery. The control unit is configured to switch the power supply mode of the household appliance according to the operating status of the household appliance. The power supply control circuit further includes: A first voltage detection unit is connected to the control unit and is used to detect a first voltage value at both ends of the rechargeable battery. A second voltage detection unit is connected to the control unit and is used to detect the second voltage value output by the switching power supply unit. The control unit is also configured to: The connection status between the household appliance and the external power source is determined based on the second voltage value; The charging state of the rechargeable battery is controlled based on the connection status, the operating status of the household appliance, and the first voltage value.

2. The power supply control circuit for household appliances according to claim 1, characterized in that, The output terminal of the relay and the second output terminal of the external power supply are respectively connected to the back-end load of the household appliance.

3. The power supply control circuit for household appliances according to claim 1, characterized in that, Also includes: A diode, the anode of which is connected to the second power output terminal of the switching power supply unit, and the cathode of which is connected to the rechargeable battery and the control unit.

4. The power supply control circuit for household appliances according to any one of claims 1-3, characterized in that, Also includes: A manual switch, which is connected in parallel with the relay.

5. The power supply control circuit for household appliances according to claim 1, characterized in that, The power supply control circuit also includes a current detection unit, which is connected to the control unit and is used to detect the charging and discharging current value of the rechargeable battery. The control unit is also configured to determine the fault state of the rechargeable battery based on the first voltage value and the charge / discharge current value.

6. The power supply control circuit for household appliances according to claim 1 or 5, characterized in that, The power supply control circuit also includes a temperature detection unit, which is connected to the control unit and is used to detect the real-time temperature of the rechargeable battery. The control unit is also configured to determine the charge / discharge state of the rechargeable battery based on the real-time temperature.

7. A method for controlling a household appliance, characterized in that, The power supply control circuit for a household appliance according to any one of claims 1-6, the control method comprising: The operating status of the household appliance is obtained, wherein the operating status includes working status and standby status; The power supply method of the household appliance is controlled according to its operating status.

8. The control method for household appliances according to claim 7, characterized in that, Also includes: Obtain the first voltage value across the rechargeable battery inside the household appliance, and obtain the second voltage value output by the switching power supply unit inside the household appliance; The connection status of the household appliance to the external power source is determined based on the second voltage value; The charging state of the rechargeable battery inside the household appliance is controlled based on the connection status, the operating status of the household appliance, and the first voltage value.

9. The control method for household appliances according to claim 8, characterized in that, Also includes: Obtain the charging and discharging current value of the rechargeable battery; The fault state of the rechargeable battery is determined based on the first voltage value and the charging / discharging current value.

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