Household appliance and circuit board

Abstract

The embodiment of the utility model belongs to the technical field of household appliances, and provides a household appliance and a circuit board. The first secondary winding of the transformer of the power supply circuit is provided with the voltage acquisition circuit, and the main control chip connected with the output end of the voltage acquisition circuit can judge whether the household appliance is powered off or not based on the voltage output by the voltage acquisition circuit. After power failure is detected, the main control chip can write current operation parameters of the household appliance into the storage chip before the power supply circuit stops supplying power. As the first secondary winding of the transformer and the power interface do not form a loop when the household appliance is in the power-off state or the standby state, no extra power consumption is generated, the power consumption of the household appliance in the power-off state or the standby state can be reduced, and the power consumption of the household appliance in the power-off state or the standby state can be reduced. And the requirements of household appliances with lower shutdown power consumption and standby power consumption requirements are met.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of household appliances. More particularly, to a household appliance and a circuit board. BACKGROUND

[0002] For a household appliance provided with a power-off memory function, when the household appliance is suddenly powered off, the household appliance can record the current running parameters (for example, including the current running mode, running time length, etc.), and when the household appliance is powered on again, the household appliance can continue to run according to the recorded parameters.

[0003] At present, an opto-coupler detection circuit can be arranged at a power supply interface of a power supply circuit of the household appliance, and whether the household appliance is powered off is detected through the opto-coupler detection circuit. However, when the household appliance is in a shutdown state or a standby state, the opto-coupler detection circuit will generate additional power consumption, which increases the power consumption of the household appliance. CONTENT OF THE INVENTION

[0004] Embodiments of the present application provide a household appliance and a circuit board, which can be used to solve the problem that when the household appliance is in a shutdown state or a standby state, the opto-coupler detection circuit will generate additional power consumption.

[0005] In a first aspect, embodiments of the present application provide a household appliance, comprising:

[0006] a main control chip;

[0007] a storage chip connected with the main control chip and configured to store running parameters of the household appliance;

[0008] a power supply circuit, comprising:

[0009] a power supply interface configured to access alternating current;

[0010] a transformer having a first primary winding, a second primary winding, a first secondary winding and a second secondary winding, and configured to output a conversion voltage based on the alternating current;

[0011] a power supply circuit connected with the second secondary winding, the second primary winding and the storage chip respectively, and configured to supply power to the storage chip based on the conversion voltage;

[0012] a voltage acquisition circuit having an input end connected with the first secondary winding and an output end connected with the main control chip, and configured to output a supply voltage to the main control chip based on the conversion voltage.

[0013] In the embodiment, the voltage acquisition circuit is arranged at the first secondary winding of the transformer of the power supply circuit, and the master control chip connected with the output end of the voltage acquisition circuit can judge whether the household appliance is powered off based on the voltage output by the voltage acquisition circuit. After detecting the power-off, the master control chip can write the current running parameter of the household appliance to the storage chip before the power supply circuit stops supplying power. That is, after the household appliance is powered off, the power supply circuit continues to supply power to the storage chip, so that the master control chip has sufficient time to complete the write operation to the storage chip, thereby realizing the power-off memory function. Moreover, the first secondary winding of the transformer does not form a loop with the power supply interface when the household appliance is in the shutdown state or standby state, so that no additional power consumption is generated, thereby reducing the power consumption of the household appliance in the shutdown state or standby state, and meeting the requirements of the household appliance with lower shutdown power consumption and standby power consumption.

[0014] In some embodiments of the present application, the power supply circuit includes a first capacitor;

[0015] The voltage acquisition circuit includes a second capacitor; wherein the capacity of the first capacitor is greater than the capacity of the second capacitor;

[0016] After the household appliance is powered off, the power supply circuit has a longer continuous power supply time based on the first capacitor than the voltage acquisition circuit based on the second capacitor, so that the master control chip writes the current running parameter of the household appliance to the storage chip before the power supply circuit stops supplying power.

[0017] In the embodiment, the first capacitor and the second capacitor are electrolytic capacitors. By arranging electrolytic capacitors with different capacities, the master control chip can perform the write operation before the power supply circuit stops supplying power after the household appliance is powered off, that is, the power supply circuit can provide sufficient time for the write operation of the master control chip after power-off.

[0018] In some embodiments of the present application, the voltage acquisition circuit further includes a first diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a third capacitor, a first voltage stabilizing diode, a fourth capacitor and a fifth capacitor.

[0019] The anode of the first diode is connected with the first output end of the first secondary winding, and the cathode of the first diode is connected with the first end of the second resistor through a first connecting line; the first end of the second capacitor is connected with the first connecting line; the first end of the first resistor is connected with the first connecting line; the second end of the second resistor is connected with the first end of the fourth resistor through a second connecting line; the first end of the third resistor is connected with the second connecting line; the second end of the fifth resistor is connected with the first end of the fifth resistor through a third connecting line; the first end of the third capacitor is connected with the third connecting line; the cathode of the first voltage stabilizing diode is connected with the third connecting line; the second end of the fifth resistor is connected with the master control chip through a fourth connecting line; the first end of the fourth capacitor is connected with the fourth connecting line; the first end of the fifth capacitor is connected with the fourth connecting line; the second end of the fifth capacitor is connected with the second output end of the first secondary winding through a fifth connecting line; the second end of the fourth capacitor, the anode of the first voltage stabilizing diode, the second end of the third capacitor, the second end of the third resistor, the second end of the first resistor, and the second end of the second capacitor are respectively connected with the fifth connecting line; and the fifth connecting line is grounded.

[0020] In the embodiment, the circuit structure can provide the master control chip with a power supply voltage adapted to the master control chip.

[0021] In some embodiments of the present application, the power supply circuit further comprises:

[0022] a rectifier circuit, an input end of the rectifier circuit being connected with the power supply interface, and the rectifier circuit being configured to rectify alternating current input by the power supply interface to form direct current;

[0023] an energy storage circuit, the energy storage circuit being connected with the output end of the rectifier circuit and the first primary winding respectively, and the energy storage circuit being configured to store energy based on the direct current and provide power for the first secondary winding and the second secondary winding.

[0024] In the embodiment, the rectifier circuit and the energy storage circuit are used to process alternating current, thereby achieving power supply for household appliances.

[0025] In some embodiments of the present application, the rectifier circuit comprises a voltage-dependent resistor, two ends of the voltage-dependent resistor being respectively connected with a zero line end and a live line end of the power supply interface.

[0026] In the embodiment, the voltage-dependent resistor is used to prevent lightning surge, thereby protecting the circuit.

[0027] In some embodiments of the present application, the energy storage circuit comprises a sixth capacitor, a seventh capacitor and an eighth capacitor.

[0028] The first end of the sixth capacitor is connected with the rectifier circuit; the second end of the sixth capacitor is connected with the rectifier circuit and the first end of the seventh capacitor respectively, the second end of the seventh capacitor is connected with the first end of the eighth capacitor; and the second end of the eighth capacitor is grounded.

[0029] In the embodiment, the energy storage is realized by the sixth capacitor. The seventh capacitor and the eighth capacitor can be used to reduce voltage fluctuation and peak, and provide smoother voltage output.

[0030] In some embodiments of the present application, the power supply circuit comprises:

[0031] a voltage feedback circuit connected with the second secondary winding;

[0032] a power supply chip connected with the second primary winding and the voltage feedback circuit respectively, and connected with the first primary winding through a sixth connection line, and configured to control the output voltage of the power supply circuit to be a target voltage based on the output voltage of the voltage feedback circuit.

[0033] In the embodiment, the power supply circuit can adjust the output voltage of the power supply circuit according to the voltage fed back by the voltage feedback circuit through the power supply chip, so that the power supply circuit can stably output the target voltage.

[0034] In some embodiments of the present application, the power supply circuit further comprises a second voltage stabilizing diode, a sixth resistor and a second diode.

[0035] The second voltage stabilizing diode, the sixth resistor and the second diode are connected in series to form a series branch, and the two ends of the series branch are connected with the energy storage circuit and the sixth connection line respectively.

[0036] In the embodiment, the series branch can improve the reliability of the circuit.

[0037] In some embodiments of the present application, the master control chip is configured to:

[0038] when the power supply voltage is less than a preset value, determine that the household appliance is powered off;

[0039] The preset value is less than or equal to the power supply voltage output by the voltage acquisition circuit when the household appliance is working at the minimum working voltage in its working voltage range.

[0040] In the embodiment, when the power supply voltage is less than the power supply voltage output by the voltage acquisition circuit corresponding to the minimum value of the working voltage range of the household appliance, it can be determined that the household appliance is powered off.

[0041] In a second aspect, the embodiments of the present application provide a circuit board, comprising:

[0042] a master chip;

[0043] a power supply circuit, comprising:

[0044] a power supply interface configured to access alternating current;

[0045] a transformer having a first primary winding, a second primary winding, a first secondary winding and a second secondary winding, and configured to output a converted voltage based on the alternating current;

[0046] a power supply circuit connected to the second secondary winding and the second primary winding respectively, and configured to supply power to the power supply circuit based on the converted voltage output by the transformer;

[0047] a voltage acquisition circuit having an input end connected to the first secondary winding and an output end connected to the master chip, and configured to output a supply voltage to the master chip;

[0048] wherein the master chip is configured to detect whether the circuit board is powered off according to the supply voltage, and perform a power-off processing operation when it is determined that the circuit board is powered off.

[0049] In the embodiments, the circuit board can achieve a power-off memory function for a device using the circuit board, and does not generate additional power consumption, thereby reducing the power consumption of the circuit board in a shutdown state or a standby state, and meeting the requirements of a device with lower shutdown power consumption and standby power consumption. BRIEF DESCRIPTION OF DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present application or the implementation manners in the related art, the following will briefly introduce the drawings needed to be used in the embodiments or related art descriptions. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0051] Figure 1 FIG. 1 is a schematic diagram of a power-off detection circuit in the related art;

[0052] Figure 2 FIG. 2 is a schematic diagram of a circuit structure of a household appliance according to some embodiments;

[0053] Figure 3 FIG. 3 is a schematic diagram of a circuit structure of a household appliance according to some embodiments;

[0054] Figure 4 FIG. 4 is a schematic diagram of a circuit structure of a voltage acquisition circuit according to some embodiments;

[0055] Figure 5 Schematic diagram of a circuit structure of a rectifier circuit according to some embodiments;

[0056] Figure 6 Schematic diagram of a circuit structure of a storage circuit according to some embodiments;

[0057] Figure 7 Schematic diagram of a circuit structure of a household appliance according to some embodiments;

[0058] Figure 8 Schematic diagram of a circuit structure of a household appliance according to some embodiments;

[0059] Figure 9 Schematic diagram of a circuit structure of a voltage feedback circuit according to some embodiments;

[0060] Figure 10 Schematic diagram of a circuit structure of a household appliance according to some embodiments.

[0061] BRIEF DESCRIPTION OF DRAWINGS

[0062] 10 - household appliance; 102 - storage chip;

[0063] 101 - master control chip; 103 - power supply circuit;

[0064] 104 - voltage acquisition circuit; 31 - power supply interface;

[0065] 32 - transformer; 33 - power supply circuit;

[0066] 34 - rectifier circuit; 35 - storage circuit;

[0067] 321 - first primary winding; 322 - second primary winding;

[0068] 323 - first secondary winding; 324 - second secondary winding;

[0069] R1 - first resistor; R2 - second resistor;

[0070] R3 - third resistor; R4 - fourth resistor;

[0071] R5 - fifth resistor; R6 - sixth resistor;

[0072] R7 - seventh resistor; R8 - eighth resistor;

[0073] R9 - ninth resistor; R10 - tenth resistor;

[0074] R11 - eleventh resistor; R12 - twelfth resistor;

[0075] R13 - Thirteenth resistor; Z1 - First zener diode;

[0076] Z2 - Second zener diode; Z3 - Third zener diode;

[0077] C1 - First capacitor; C2 - Second capacitor;

[0078] C3 - Third capacitor; C4 - Fourth capacitor;

[0079] C5 - Fifth capacitor; C6 - Sixth capacitor;

[0080] C7 - Seventh capacitor; C8 - Eighth capacitor;

[0081] C9 - Ninth capacitor; C10 - Tenth capacitor;

[0082] C11 - Eleventh capacitor; C12 - Twelfth capacitor;

[0083] C13 - Thirteenth capacitor; OP - Optocoupler;

[0084] L1 - First pin of optocoupler OP; L2 - Second pin of optocoupler OP;

[0085] L3 - Third pin of optocoupler OP; L4 - Fourth pin of optocoupler OP;

[0086] TF - Trace fuse; RV - Voltage-dependent resistor;

[0087] T1 - Fifth access terminal; T2 - Sixth access terminal;

[0088] T4 - Seventh access terminal; T5 - Eighth access terminal;

[0089] T6 - Second output terminal; T7 - Fourth access terminal;

[0090] T8 - Third access terminal; T9 - First output terminal. DETAILED DESCRIPTION

[0091] In order to make the purposes, implementations and advantages of the present application clearer, the following will be a clear and complete description of the exemplary embodiments of the present application in conjunction with the accompanying drawings of the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application.

[0092] It should be noted that the brief description of the terms in the present application is only for the convenience of understanding the following described embodiments, and is not intended to limit the embodiments of the present application. Unless otherwise specified, these terms should be understood according to their ordinary and general meanings.

[0093] In addition, the terms "comprise" and "have" and any variations thereof are intended to cover a non-exclusive inclusion, for example, a product or apparatus that comprises a list of components does not necessarily comprise only those components but can include other components not expressly listed or inherent to such product or apparatus.

[0094] With the development of technology, intelligent household appliances are increasingly favored by consumers. Intelligent household appliances not only improve the quality of life, but also bring comfort and convenience to people. Among them, intelligent power-off memory technology is one of them. Power-off memory function is a function that electronic devices or systems can retain their running parameters after power failure. This function is usually used in household appliances and other devices that need to run for a long time.

[0095] For example, when the household appliance is powered off, the running parameters are saved in the temporary memory, such as electrically erasable programmable read only memory (EEPROM). When powered on again, the household appliance can restore to the state before power failure and continue to execute the unfinished running program. For example, when the washing machine is powered on again, it can read the running parameters stored in the temporary memory, so that the washing machine can automatically restore the washing program and running state before power failure.

[0096] Figure 1 A schematic diagram of a power-off detection circuit in the related art, which is an optical coupling detection circuit, as shown in Figure 1 The optical coupling detection circuit is arranged at the power interface, and a resistor and a diode are added between the live end L and the neutral end N. Since the power interface is connected to alternating current, an optical coupling needs to be added for isolation. When there is 220V alternating current between LN, the voltage of the positive half wave can pass through the optical coupling, and the 3 pin and 4 pin of the optical coupling will be turned on, driving the N202 triode to be turned on. When there is no 220V alternating current between LN, the triode N202 is not turned on. In this way, a square wave will be output at the "50HZ" output end. When a square wave is detected, it means that there is 220V alternating current between LN. When no square wave is detected, it means that there is no 220V alternating current between LN.

[0097] From the perspective of energy saving and environmental protection, the standby power consumption and the shutdown power consumption of the household appliance such as the washing machine or the clothes dryer are required to be higher and higher, for example, the standby power consumption of the washing machine is required to be less than 0.5 W (watt), and the shutdown power consumption is required to be less than 0.3 W. In the above-mentioned optical coupling detection circuit, the series resistors (R206, R207 and R208) are arranged between the LN, when the LN has the power input, the power consumption is generated. Of course, the resistance values of the three resistors R206, R207 and R208 can be increased to reduce the power consumption, but after the resistance values of the three resistors are increased, the current flowing through the pins 1 and 2 of the optical coupling is reduced, that is, the actual working current of the optical coupling is reduced after the resistance values of the three resistors are increased, and the actual working current of the optical coupling cannot reach the required working current, so that the reliability of the power-off detection circuit cannot be guaranteed.

[0098] Therefore, the household appliance provided in the present application is provided with a voltage acquisition circuit arranged at the first secondary winding of the transformer of the power supply circuit, and the main control chip connected with the output end of the voltage acquisition circuit can judge whether the household appliance is powered off based on the output voltage of the voltage acquisition circuit. When the power-off is detected, the main control chip can write the current running parameters of the household appliance into the storage chip before the power supply circuit of the power supply circuit stops supplying power. That is, after the household appliance is powered off, the power supply circuit continues to supply power to the storage chip through the power supply circuit connected with the second secondary winding of the transformer, so that the main control chip has enough time to complete the write operation to the storage chip, thereby realizing the power-off memory function. Moreover, the first secondary winding of the transformer does not form a loop with the power supply interface when the household appliance is in the shutdown state or the standby state, so that no additional power consumption is generated, thereby reducing the power consumption of the household appliance in the shutdown state or the standby state, and meeting the requirements of the household appliance with lower shutdown power consumption and standby power consumption.

[0099] It can be understood that the voltage acquisition circuit continues to supply power to the main control chip after the household appliance is powered off, so that the main control chip can complete the write operation.

[0100] In some embodiments, the household appliance can be a washing machine, a clothes dryer or other appliances, and the present application does not limit the same.

[0101] In the embodiments of the present application, the shutdown power consumption refers to the electric energy consumed by the household appliance in the shutdown state. Taking the washing machine as an example, even if the washing machine does not perform washing, rinsing or dehydration operations, some circuits (such as power indicator lights, clock circuits, etc.) may still consume a small amount of electric energy, and the shutdown power consumption is usually low, but in the long-term use process, it still has a certain influence on the overall energy consumption.

[0102] Standby power consumption refers to the power consumed by a household appliance in standby state. Taking a washing machine as an example, the standby state means that the washing machine is not performing a washing operation, but some circuits and functions are still active, ready to start at any time. In standby state, the washing machine is powered on but not running the washing program, the display screen may display the time or other information, the control panel is on standby, and some sensors and electronic components may also be active. Standby power consumption is usually low, but higher than that of the off state.

[0103] The technical solutions of the present application will be described in detail below in conjunction with specific embodiments. The following specific embodiments can be combined with each other or exist independently, and the same or similar concepts or processes may not be described in detail in some embodiments. The embodiments of the present application will be described below in conjunction with the drawings.

[0104] First, the circuit structure of a household appliance provided by some embodiments of the present application is described.

[0105] In some embodiments, Figure 2 A schematic diagram of the circuit structure of a household appliance according to some embodiments is shown in Figure 2 The household appliance 10 includes a main control chip 101.

[0106] The household appliance 10 also includes a storage chip 102 connected to the main control chip 101, which is configured to store the operating parameters of the household appliance 10.

[0107] The household appliance 10 also includes a power supply circuit 103 connected to the storage chip 102, which is configured to supply power to the storage chip 102.

[0108] The household appliance 10 also includes a voltage acquisition circuit 104 connected to the power supply circuit 103 and the main control chip 101, which is configured to output the supply voltage to the main control chip 101.

[0109] In some embodiments, the main control chip 101 is configured to detect whether the household appliance 10 is powered off according to the supply voltage output by the voltage acquisition circuit 104. After determining that the household appliance 10 is powered off, the current operating parameters of the household appliance can be written to the storage chip 102 before the power supply circuit 103 stops supplying power.

[0110] For example, the current operating parameters of the washing machine can include the current washing mode (such as standard washing or quick washing, etc.), the stage in the current washing mode (such as main washing, rinsing or dehydration, etc.), the remaining time and water level, etc. The recording of these parameters helps the washing machine to continue the previous washing program after the power is restored, without the need to reset and restart. This not only improves the convenience of the user, but also ensures the continuity and consistency of the washing process.

[0111] In some embodiments, the master chip 101 can be a microcontroller unit (MCU).

[0112] In some embodiments, the storage chip 102 can be an EEPROM.

[0113] In some embodiments, Figure 3 A schematic diagram of a circuit structure of a household appliance according to some embodiments is shown in FIG. 1. As shown in FIG. 1, the power supply circuit 103 includes a power interface 31 configured to access alternating current. Figure 3

[0114] In some embodiments, the power supply circuit 103 further includes a transformer 32 having a first primary winding 321, a second primary winding 322, a first secondary winding 323, and a second secondary winding 324, configured to output a converted voltage based on the alternating current accessed by the power interface 31.

[0115] In some embodiments, the power supply circuit 103 further includes a power supply circuit 33 connected with the second secondary winding 324, the second primary winding 322, and the storage chip 102 respectively, the power supply circuit 33 being configured to supply power to the power supply circuit 103 and the storage chip 102 based on the converted voltage.

[0116] Specifically, when the power interface 31 accesses the alternating current, the transformer 32 can output the converted voltage based on the alternating current, provide power to the power supply circuit 33 through the second secondary winding 324, and provide power to the voltage acquisition circuit 104 through the first secondary winding 323, so that the power supply circuit 33 can supply power to the power supply circuit 103 and the storage chip 102 based on the power provided by the transformer 32 through the second secondary winding 324, and so that the voltage acquisition circuit 104 can supply power to the master chip 101 based on the power provided by the transformer 32 through the first secondary winding 323.

[0117] In some embodiments, after the household appliance 10 is powered off, the duration of the continuous power supply of the power supply circuit 33 is greater than the duration of the continuous power supply of the voltage acquisition circuit, which can enable the master chip 101 to have sufficient time to write the current running parameters of the household appliance to the storage chip 102 before the power supply circuit 103 stops supplying power.

[0118] In some embodiments, the voltage acquisition circuit 104 can provide the master chip 101 with a supply voltage adapted to it, that is, the voltage provided by the voltage acquisition circuit 104 is the working voltage required by the master chip 101, for example, the working voltage of the master chip 101 is 5V, and the master chip 101 can determine whether the household appliance 10 is powered off based on the voltage.

[0119] ​In some embodiments, the master chip 101 is configured to determine that the household appliance 10 is powered off when the supply voltage output by the voltage collection circuit 104 is less than a preset value, and write the current running parameters of the household appliance 10 to the storage chip 102.

[0120] The preset value can be less than or equal to the supply voltage output by the voltage collection circuit 104 when the household appliance 10 is working at the minimum working voltage of the working voltage range thereof.

[0121] For example, the working voltage range of the household appliance 10 is greater than or equal to 187V and less than or equal to 264V. For example, at 187V, 230V and 264V, Table 1 shows the supply voltage output by the voltage collection circuit 104 at different voltages.

[0122] Table 1

[0123]

[0124] In this example, the preset value can be 2.2V. That is, if the supply voltage output by the voltage collection circuit 104 is less than 2.2V, it can be determined that the household appliance 10 is powered off.

[0125] In this embodiment, the voltage collection circuit 104 is arranged at the first secondary winding 323 of the transformer 32 of the power supply circuit 103, and the master chip 101 connected to the output end of the voltage collection circuit 104 can determine whether the household appliance 10 is powered off based on the voltage output by the voltage collection circuit 104. When the power-off is detected, the master chip 101 can write the current running parameters of the household appliance 10 to the storage chip 102 before the power supply circuit 33 stops supplying power. That is, after the household appliance 10 is powered off, the power supply circuit 33 continues to supply power to the storage chip 102, so that the master chip 101 has sufficient time to complete the write operation to the storage chip 102, thereby realizing the power-off memory function. Moreover, since the first secondary winding 323 of the transformer 32 does not form a loop with the power supply interface 31 when the household appliance 10 is in the shutdown state or standby state, no additional power consumption is generated, thereby reducing the power consumption of the household appliance 10 in the shutdown state or standby state, and meeting the requirements of household appliances with lower shutdown power consumption and standby power consumption.

[0126] In some embodiments, the power supply circuit 33 includes a first capacitor C1, and the voltage collection circuit 104 includes a second capacitor C2. The capacity of the first capacitor C1 is greater than the capacity of the second capacitor C2.

[0127] After the household appliance 10 is powered off, the power supply time of the power supply circuit 33 based on the first capacitor C1 is longer than the power supply time of the voltage collection circuit 104 based on the second capacitor C2.

[0128] In some embodiments, the first capacitor C1 and the second capacitor C2 are electrolytic capacitors, which can achieve energy storage. For example, the capacitance of the first capacitor C1 can be 680 μF (microfarads), and the capacitance of the second capacitor C2 can be 22 μF.

[0129] In other words, by setting a large-capacity capacitor in the power supply circuit 33, the main control chip 101 can perform a write operation after the household appliance 10 is powered off and before the power supply circuit 33 stops supplying power. That is, after the power is off, the power supply circuit 33 can provide enough time for the main control chip 101 to perform a write operation.

[0130] In some embodiments, Figure 4 This is a schematic diagram of the circuit structure of a voltage acquisition circuit according to some embodiments, such as Figure 4 As shown, the voltage acquisition circuit 104 also includes: a first diode D1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a third capacitor C3, a first Zener diode Z1, a fourth capacitor C4, and a fifth capacitor C5.

[0131] In this configuration, the anode of the first diode D1 is connected to the first output terminal T9 of the first secondary winding 323, and the cathode of the first diode D1 is connected to the first terminal of the second resistor R2 via a first connecting line. The first terminal of the second capacitor C2 is connected to the first connecting line. The first terminal of the first resistor R1 is connected to the first connecting line. The second terminal of the second resistor R2 is connected to the first terminal of the fourth resistor R4 via a second connecting line. The first terminal of the third resistor R3 is connected to the second connecting line. The second terminal of the fourth resistor R4 is connected to the first terminal of the fifth resistor R5 via a third connecting line. The first terminal of the third capacitor C3 is connected to the third connecting line. The cathode of the first Zener diode Z1 is connected to the third connecting line. The second terminal of the fifth resistor R5 is connected to the main control chip 101 via a fourth connecting line. The first terminal of the fourth capacitor C4 is connected to the fourth connecting line. The first terminal of the fifth capacitor C5 is connected to the fourth connecting line. The second terminal of the fifth capacitor C5 is connected to the second output terminal T6 of the first secondary winding 323 via a fifth connecting line. The second terminal of the fourth capacitor C4, the anode of the first Zener diode Z1, the second terminal of the third capacitor C3, the second terminal of the third resistor R3, the second terminal of the first resistor R1, and the second terminal of the second capacitor C2 are respectively connected to the fifth connecting line. The fifth connecting line is grounded.

[0132] The second resistor R2 and the third resistor R3 are used to divide the voltage at the first end of the second resistor R2. The first voltage stabilizing diode Z1 is used to control the voltage collection circuit 104 to stabilize the output working voltage required by the master control chip 101, to avoid voltage instability caused by interference or pulses, so that the voltage collection circuit 104 outputs a voltage greater than the working voltage required by the master control chip 101, causing damage to the master control chip 101. The fourth resistor R4, the fifth resistor R5, the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 are used to realize filtering and improve the stability of the circuit. The first resistor R1 can be used as a dummy load to improve the stability of the voltage.

[0133] Through the circuit structure, the master control chip 101 can be provided with a power supply voltage adapted to it.

[0134] In some embodiments, as shown in Figure 3 the power supply circuit 103 further includes a rectifier circuit 34, and an input end of the rectifier circuit 34 is connected with the power supply interface 31. The rectifier circuit 34 is configured to rectify the alternating current input by the power supply interface 31 to form direct current.

[0135] In some embodiments, the power supply circuit 103 further includes an energy storage circuit 35. The energy storage circuit 35 is connected with the output end of the rectifier circuit 34 and the first primary winding 321 respectively.

[0136] The energy storage circuit 35 is configured to store energy based on the direct current and provide power for the first secondary winding 323 and the second secondary winding 324.

[0137] For example, if the alternating current is 220V, the rectifier circuit 34 can rectify the alternating current to obtain 310V direct current. The energy storage circuit 35 can store energy based on the direct current and provide power for the first secondary winding 323 and the second secondary winding 324.

[0138] The rectifier circuit 34 and the energy storage circuit 35 are used to process the alternating current, thereby realizing power supply for the household appliance 10.

[0139] In some embodiments, Figure 5 For the circuit structure of a rectifier circuit according to some embodiments, as shown in Figure 5 the rectifier circuit 34 includes a voltage-dependent resistor RV, and two ends of the voltage-dependent resistor RV are connected with a neutral line end N and a live line end L of the power supply interface 31 respectively. By setting the voltage-dependent resistor RV, lightning surge can be prevented, thereby protecting the circuit.

[0140] In some embodiments, as shown in Figure 5 the voltage-dependent resistor RV and the neutral line end N can be provided with a wiring fuse TF for overload protection.

[0141] In some embodiments, Figure 6 Fig. 4 is a schematic diagram of a circuit structure of a power supply circuit according to some embodiments, as Figure 6 shown, the tank circuit 35 includes a sixth capacitor C6, a seventh capacitor C7 and an eighth capacitor C8.

[0142] The first end of the sixth capacitor C6 is connected with the rectifier circuit 34. The second end of the sixth capacitor C6 is connected with the rectifier circuit 34 and the first end of the seventh capacitor C7 respectively, and the second end of the seventh capacitor C7 is connected with the first end of the eighth capacitor C8. The second end of the eighth capacitor C8 is grounded.

[0143] In some embodiments, the sixth capacitor C6 is an electrolytic capacitor for energy storage, which can be used to provide a stable DC voltage, for example 310V, for the first secondary winding 323 and the second secondary winding 324. The seventh capacitor C7 and the eighth capacitor C8 can be used to reduce voltage fluctuations and spikes, providing a smoother voltage output.

[0144] In some embodiments, as Figure 5 shown, the rectifier circuit 34 can include a seventh resistor R7, a third diode D3, a fourth diode D4, a fifth diode D5 and a sixth diode D6.

[0145] The first end of the seventh resistor R7 is connected with the live end L of the power supply interface 31, and the second end of the seventh resistor R7 is connected with the anode of the third diode D3 and the cathode of the fourth diode D4 respectively. The cathode of the third diode D3 is connected with the fifth access end T1 of the first primary winding 321 through an eighth connecting line, and the second end of the sixth capacitor C6 is connected with the eighth connecting line. The cathode of the fifth diode D5 is connected with the neutral end of the power supply interface 31, and the anode of the fifth diode D5 is connected with the anode of the fourth diode D4 through a seventh connecting line. The anode of the sixth diode D6 is connected with the neutral end of the power supply interface 31, and the cathode of the sixth diode D6 is connected with the eighth connecting line. The first end of the sixth capacitor C6 is connected with the seventh connecting line.

[0146] Through the rectifier circuit 34, the rectification of alternating current can be realized, thereby outputting direct current.

[0147] In some embodiments, Figure 7 Fig. 5 is a schematic diagram of a circuit structure of a household appliance according to some embodiments, as Figure 7 shown, the power supply circuit 33 includes a power supply chip 331, the power supply chip 331 is connected with the second primary winding 322 and the voltage feedback circuit 332 respectively, and the power supply chip 331 is connected with the first primary winding 321 through a sixth connecting line. Specifically, the power supply chip 331 can be connected with the sixth access end T2 of the first primary winding 321.

[0148] The power supply chip 331 is configured to control the output voltage of the power supply circuit 33 to be a target voltage based on the output voltage of the voltage feedback circuit 332.

[0149] In some embodiments, the power supply circuit 33 further comprises a voltage feedback circuit 332 connected with the second auxiliary winding 324.

[0150] For example, the target voltage can be 12V, which can be used to supply power to the storage chip 102. It can be understood that the power supply circuit 103 can also process the target voltage through other circuit structures to provide the required voltage for the storage chip 102. For example, if the storage chip 102 requires a voltage of 5V, the power supply circuit 103 can step down the target voltage to provide a power supply voltage of 5V for the storage chip 102.

[0151] In some embodiments, Figure 8 FIG. 1 shows a schematic diagram of a circuit structure of a household appliance according to some embodiments. Figure 8 As shown, the power supply circuit 33 further comprises a second zener diode Z2, a sixth resistor R6, and a second diode D2.

[0152] The second zener diode Z2, the sixth resistor R6, and the second diode D2 are connected in series to form a series branch, and the two ends of the series branch are connected with the energy storage circuit 35 and the sixth connection line, respectively. Specifically, the two ends of the series branch are connected with the eighth connection line and the sixth connection line, respectively.

[0153] The series branch absorbs the spikes of the Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) in the power supply chip 331, thereby improving the reliability of the circuit. The specific circuit of the power supply chip 331 is not described in the present application.

[0154] In some embodiments, Figure 9 FIG. 2 shows a schematic diagram of a circuit structure of a voltage feedback circuit according to some embodiments. Figure 9 As shown, the voltage feedback circuit 332 comprises a ninth capacitor C9, an eighth resistor R8, a ninth resistor R9, a seventh diode D7, a tenth capacitor C10, an eleventh capacitor C11, a tenth resistor R10, a third zener diode Z3, an eleventh resistor R11, an optocoupler OP, a thirteenth capacitor C13, a twelfth resistor R12, a twelfth capacitor C12, a thirteenth resistor R13, and an eighth diode D8.

[0155] The first end of the ninth capacitor C9 is connected with the third access end T8 of the second secondary winding 324 of the transformer 32, the second end of the ninth capacitor C9 is connected with the first end of the ninth resistor R9, the eighth resistor R8 is connected with the ninth resistor R9 in parallel, the second end of the ninth resistor R9 is connected with the first end of the first capacitor C1. The anode of the seventh diode D7 is connected with the first end of the ninth capacitor C9, and the cathode of the seventh diode D7 is connected with the output end of the power supply circuit 33 through the ninth connecting line. The second end of the first capacitor C1 is connected with the fourth access end T7 of the second secondary winding 324. The first end of the tenth capacitor C10 and the first end of the eleventh capacitor C11 are both connected with the ninth connecting line, and the second end of the tenth capacitor C10 and the second end of the eleventh capacitor C11 are both connected with the second end of the first capacitor C1. The second end of the first capacitor C1 is grounded.

[0156] The first end of the tenth resistor R10 is connected with the cathode of the seventh diode D7. The second end of the tenth resistor R10 is connected with the cathode of the third voltage stabilizing diode Z3. The anode of the third voltage stabilizing diode Z3 is connected with the first end of the eleventh resistor R11. The first end of the eleventh resistor R11 is connected with the first pin L1 of the optical coupler OP, and the second end of the eleventh resistor R11 is connected with the second pin L2 of the optical coupler OP. The second end of the eleventh resistor R11 is grounded.

[0157] The fourth pin L4 of the optical coupler OP is connected with the power supply chip 331 through the tenth connecting line, and the third pin L3 of the optical coupler OP is connected with the seventh connecting line through the eleventh connecting line. The first end of the thirteenth capacitor C13 and the first end of the twelfth resistor R12 are both connected with the tenth connecting line. The second end of the thirteenth capacitor C13 and the second end of the twelfth resistor R12 are both connected with the eleventh connecting line. The eleventh connecting line is grounded. The first end of the twelfth capacitor C12 is connected with the power supply chip 331 through the twelfth connecting line, and the second end of the twelfth capacitor C12 is connected with the eleventh connecting line. The first end of the thirteenth resistor R13 is connected with the twelfth connecting line. The second end of the thirteenth resistor R13 is connected with the cathode of the eighth diode D8. The anode of the eighth diode D8 is connected with the seventh access end T4 of the second primary winding 322, and the eighth access end T5 of the second primary winding 322 is grounded.

[0158] By the above circuit structure, the output voltage of the power supply circuit 33 can be fed back to the power supply chip 331, so that the power supply chip 331 controls the output voltage of the power supply circuit 33 to be the target voltage based on the output voltage of the voltage feedback circuit 332. Taking 12V as the target voltage for example, if the output voltage of the voltage feedback circuit 332 is less than 12V, the energy provided by the first primary winding 321 of the transformer 32 can be increased, and if the output voltage of the voltage feedback circuit 332 is greater than 12V, the energy provided by the first primary winding 321 of the transformer 32 can be reduced, so that the output voltage of the power supply circuit 33 is stabilized at the target voltage.

[0159] In some embodiments, Figure 10 A schematic diagram of a circuit structure of a household appliance according to some embodiments. The power supply circuit 103 can continue to supply power to the storage chip 102 through the power supply circuit 33 connected with the second secondary winding 324 of the transformer 32 after the household appliance 10 is powered off, so that the master control chip 101 has enough time to complete the write operation to the storage chip 102, thereby realizing the power-off memory function. Moreover, the first secondary winding 323 of the transformer 32 does not form a loop with the power supply interface 31 when the household appliance 10 is in the shutdown state or standby state, so that no additional power consumption is generated, thereby reducing the power consumption of the household appliance 10 in the shutdown state or standby state, and meeting the needs of household appliances with lower shutdown power consumption and standby power consumption requirements.

[0160] In some embodiments, a circuit board comprises:

[0161] a master control chip.

[0162] a power supply circuit, comprising:

[0163] a power supply interface configured to access alternating current.

[0164] a transformer having a first primary winding, a second primary winding, a first secondary winding, and a second secondary winding, configured to output a conversion voltage based on the alternating current.

[0165] a power supply circuit connected with the second secondary winding and the second primary winding respectively, configured to supply power to the power supply circuit based on the conversion voltage output by the transformer.

[0166] a voltage acquisition circuit having an input end connected with the first secondary winding and an output end connected with the master control chip, the voltage acquisition circuit configured to output a power supply voltage to the master control chip.

[0167] wherein the master control chip is configured to detect whether the circuit board is powered off according to the power supply voltage, and perform a power-off processing operation when it is determined that the circuit board is powered off.

[0168] The power-off processing operation can include data storage.

[0169] The circuit board can be applied to a computer, a server or the like, and can realize the power-off memory function of the device. In addition, no additional power consumption is generated, so that the power consumption of the circuit board in the shutdown state or standby state can be reduced, and the requirements of the device with lower shutdown power consumption and standby power consumption can be met.

[0170] It should be noted that in the above embodiments, 1 in the circuit diagram represents the first end, and 2 represents the second end. Taking the first resistor R1 as an example, 1 of the first resistor R1 represents the first end of the first resistor R1, and 2 of the first resistor R1 represents the second end of the first resistor R1. Other similar, here will not be repeated. GND represents ground.

[0171] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0172] The above description has been made in conjunction with specific embodiments for the convenience of explanation. However, the above exemplary discussion is not intended to exhaust or limit the embodiments to the specific forms disclosed above. Various modifications and variations can be derived according to the above teachings. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different modified embodiments suitable for specific use considerations.

[0173] The first, second, etc. descriptions appearing in the embodiments of the present application are only for illustration and differentiation of the described objects, and have no order, nor represent a special limitation on the number of devices in the embodiments of the present application, and cannot constitute any limitation on the embodiments of the present application. For example, the first threshold and the second threshold are only used to distinguish different thresholds, and do not represent the difference in size, priority or importance of the two thresholds.

[0174] In the present application, "example", "in some embodiments", "in other embodiments" and the like are used to represent an example, illustration or explanation. Any embodiment or design scheme described as "example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the use of the word example is intended to present the concept in a specific way.

[0175] The "of", "corresponding", "relevant", "corresponding", "corresponding" and "corresponding" in this application can be mixed sometimes. It should be pointed out that the meanings expressed are consistent when the differences are not emphasized.

Claims

1. A domestic appliance, characterized in that, The application relates to a household appliance, which comprises a main control chip, a storage chip connected with the main control chip and configured to store operation parameters of the household appliance, a power supply circuit comprising a power supply interface configured to access alternating current, a transformer having a first primary winding, a second primary winding, a first secondary winding and a second secondary winding and configured to output a conversion voltage based on the alternating current, a power supply circuit connected with the second secondary winding, the second primary winding and the storage chip respectively and configured to supply power to the storage chip based on the conversion voltage, and a voltage acquisition circuit having an input end connected with the first secondary winding and an output end connected with the main control chip and configured to output a power supply voltage to the main control chip based on the conversion voltage.

2. The household appliance according to claim 1, wherein the power supply circuit comprises a first capacitor, the voltage acquisition circuit comprises a second capacitor, the capacity of the first capacitor is greater than the capacity of the second capacitor, and after the household appliance is powered off, the power supply circuit based on the first capacitor has a longer power supply duration than the voltage acquisition circuit based on the second capacitor, so that the main control chip writes current operation parameters of the household appliance to the storage chip before the power supply circuit stops supplying power. The voltage acquisition circuit further comprises a first diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a third capacitor, a first voltage stabilizing diode, a fourth capacitor and a fifth capacitor. The anode of the first diode is connected with a first output end of the first secondary winding, the cathode of the first diode is connected with a first end of the second resistor through a first connecting line, the first end of the second capacitor is connected with the first connecting line, the first end of the first resistor is connected with the first connecting line, the second end of the second resistor is connected with a first end of the fourth resistor through a second connecting line, the first end of the third resistor is connected with the second connecting line, the second end of the fourth resistor is connected with a first end of the fifth resistor through a third connecting line, the first end of the third capacitor is connected with the third connecting line, the cathode of the first voltage stabilizing diode is connected with the third connecting line, the second end of the fifth resistor is connected with the main control chip through a fourth connecting line, the first end of the fourth capacitor is connected with the fourth connecting line, the first end of the fifth capacitor is connected with the fourth connecting line, the second end of the fifth capacitor is connected with a second output end of the first secondary winding through a fifth connecting line, the second end of the fourth capacitor, the anode of the first voltage stabilizing diode, the second end of the third capacitor, the second end of the third resistor, the second end of the first resistor and the second end of the second capacitor are respectively connected with the fifth connecting line, and the fifth connecting line is grounded. The power supply circuit further comprises a rectifier circuit having an input end connected with the power supply interface and configured to rectify the alternating current input by the power supply interface to form direct current. ​ ​ ​ ​ ​ ​ 3. The domestic appliance according to claim 2, characterized in that, ​ ​ 4. The domestic appliance according to claim 1, characterized in that, ​ ​ The energy storage circuit is connected with the output end of the rectifier circuit and the first primary winding respectively, and is configured to store energy based on the direct current and provide power for the first secondary winding and the second secondary winding.

5. The domestic appliance according to claim 4, characterized in that, The rectifier circuit comprises a pressure-sensitive resistor, two ends of the pressure-sensitive resistor being connected with a zero line end and a live line end of the power supply interface respectively.

6. The domestic appliance according to claim 4, characterized in that, The energy storage circuit comprises a sixth capacitor, a seventh capacitor and an eighth capacitor. The first end of the sixth capacitor is connected with the rectifier circuit, the second end of the sixth capacitor is connected with the rectifier circuit and the first end of the seventh capacitor respectively, the second end of the seventh capacitor is connected with the first end of the eighth capacitor, and the second end of the eighth capacitor is grounded.

7. The domestic appliance according to claim 4, characterized in that, The power supply circuit comprises: a voltage feedback circuit connected with the second secondary winding; a power supply chip connected with the second primary winding and the voltage feedback circuit respectively, the power supply chip being connected with the first primary winding through a sixth connection line and being configured to control the output voltage of the power supply circuit to be a target voltage based on the output voltage of the voltage feedback circuit.

8. The domestic appliance according to claim 7, characterized in that, The power supply circuit further comprises a second voltage stabilizing diode, a sixth resistor and a second diode. The second voltage stabilizing diode, the sixth resistor and the second diode are connected in series to form a series branch, and two ends of the series branch are connected with the energy storage circuit and the sixth connection line respectively.

9. The domestic appliance according to claim 1, characterized in that, The master control chip is configured to: determine that the household appliance is powered off when the power supply voltage is less than a preset value; The preset value is less than or equal to the power supply voltage output by the voltage acquisition circuit when the household appliance is working at the minimum working voltage in the working voltage range thereof.

10. A circuit board, characterized by It comprises: a master control chip; a power supply circuit comprising: a power supply interface configured to access alternating current; a transformer having a first primary winding, a second primary winding, a first secondary winding and a second secondary winding, and being configured to output a conversion voltage based on the alternating current; a power supply circuit connected with the second secondary winding and the second primary winding respectively, and being configured to supply power to the power supply circuit based on the conversion voltage output by the transformer; a voltage acquisition circuit having an input end connected with the first secondary winding and an output end connected with the master control chip, and being configured to output a power supply voltage to the master control chip; The master control chip is configured to detect whether the circuit board is powered off according to the power supply voltage, and perform a power-off processing operation when it is determined that the circuit board is powered off.

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