Weight detection circuit for washing machine and washing machine
Patent Information
- Application Number
- CN202521818056.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-26
- Publication Date
- 2026-09-25
- Estimated Expiration
- 2035-08-26
AI Technical Summary
然而当电源环境恶劣或者干扰较大时，会影响洗衣机重量感知的判断，从而导致进水量异常的情况发生
[0034]本实用新型提供的用于洗衣机的重量检测电路包括基准模块、主控模块、比较模块以及电阻式应变感知模块；所述基准模块用于提供基准的输出电压；所述比较模块的第一输入端与所述电阻式应变感知模块连接，所述比较模块的第二输入端用于与所述基准模块连接，所述比较模块的正向电源输入端与第一电源连接；所述电阻式应变感知模块用于安装在所述洗衣机的内筒外侧，以进行重量感知并发生电阻值变化；所述主控模块与所述比较模块的输出端连接，用于接收所述比较模块的输出信号。当洗衣机启动时，通过电阻式应变感知模块进行重量感知，桶内衣物压在电阻式应变感知模块使应变片发生形变，应变片电阻值发生变化，此时桶内对应的金属触点和外筒上的信号接收触点接触导通，将信号传输至比较模块的第一输入端，通过比较模块的输出情况即可判断负载重量大小。如此可以避免因电源环境恶劣或者干扰等因素导致的重量感知判断错误的情况发生。
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Figure CN224799175U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cleaning technology, and in particular to a weight detection circuit for a washing machine and a washing machine. Background Technology
[0002] A washing machine is a cleaning appliance that uses electrical energy to generate mechanical action to wash clothes. During the washing process, the amount of laundry is often unknown, and this amount significantly affects the washing time, water intake time, water volume, and washing rhythm. Therefore, it is generally necessary to determine the amount of laundry before starting the wash cycle.
[0003] In existing technologies, the weight of the clothes in the drum is determined by sensing the motor control current, thereby setting the specific water intake and washing time. However, when the power environment is poor or there is significant interference, it can affect the washing machine's weight sensing judgment, leading to abnormal water intake.
[0004] The above content is only used to help understand the technical solution of this utility model and does not represent an admission that the above content is prior art. Utility Model Content
[0005] The main objective of this invention is to provide a weight detection circuit for a washing machine and a washing machine in general, thereby solving the aforementioned technical problems in the prior art.
[0006] To achieve the above objectives, this utility model provides a weight detection circuit for a washing machine, which includes a reference module, a main control module, a comparison module, and a resistive strain sensing module.
[0007] The reference module is used to provide a reference output voltage;
[0008] The first input terminal of the comparison module is connected to the resistive strain sensing module, the second input terminal of the comparison module is used to connect to the reference module, and the positive power input terminal of the comparison module is connected to the first power supply.
[0009] The resistive strain sensing module is installed on the outside of the inner drum of the washing machine to sense weight and detect changes in resistance.
[0010] The main control module is connected to the output terminal of the comparison module and is used to receive the output signal of the comparison module.
[0011] Preferably, in the weight detection circuit for the washing machine, the reference module includes a plurality of series resistors connected in series and a second power supply.
[0012] The comparison module includes at least one comparator, the number of which matches the number of multiple series resistors, and the second input terminal of each comparator is connected to the common connection terminal of two adjacent series resistors.
[0013] Preferably, in the weight detection circuit for the washing machine, the plurality of series resistors include a first resistor and a second resistor, a first end of the first resistor is connected to a second power supply, a second end of the first resistor is connected to the first end of the second resistor, and a second end of the second resistor is grounded.
[0014] The comparison module includes a comparator, the second input terminal of which is connected to the common connection terminal of the second terminal of the first resistor and the first terminal of the second resistor.
[0015] Preferably, in the weight detection circuit for the washing machine, the plurality of series resistors include a first resistor, a second resistor, and a third resistor, wherein a first end of the first resistor is connected to a second power supply, a second end of the first resistor is connected to a first end of the second resistor, a second end of the second resistor is connected to a first end of the third resistor, and a second end of the third resistor is grounded.
[0016] The comparison module includes a first comparator and a second comparator. The first input terminals of both the first and second comparators are connected to the strain sensing module. The second input terminal of the first comparator is connected to the common connection terminal of the second terminal of the first resistor and the first terminal of the second resistor. The second input terminal of the second comparator is connected to the common connection terminal of the second terminal of the second resistor and the first terminal of the third resistor. The positive power input terminals of the first and second comparators are connected to a first power supply.
[0017] Preferably, in the weight detection circuit for the washing machine, the main control module is further configured to:
[0018] When the voltage at the first input terminal is less than VCC / 3, the output terminal of the first comparator outputs a low level, and the output terminal of comparator IC2 also outputs a low level, indicating a small load.
[0019] When VCC / 3 < voltage at the first input terminal < 2*VCC / 3, the output terminal of the first comparator outputs a high level, and the output terminal of the second comparator outputs a low level, indicating a medium load.
[0020] When the voltage at the first input terminal is greater than 2*VCC / 3, the output terminal of the first comparator outputs a high level, and the output terminal of the second comparator outputs a high level, indicating a large load.
[0021] The input voltage at the positive power input terminal is VCC;
[0022] The voltages at the first input terminals of the first comparator and the second comparator are the same, and both are represented by the voltage at the first input terminal.
[0023] Preferably, in the weight detection circuit for the washing machine, a fourth resistor is connected between the negative power input terminal of the comparison module and the first input terminal of the comparison module;
[0024] The negative power input terminal of the comparison module is grounded.
[0025] Preferably, in the weight detection circuit for the washing machine, the comparison module includes multiple comparators, and the fourth resistor is connected between the common connection terminal to which the negative power input terminals of the multiple comparators are connected and the common connection terminal to which the first input terminals of the multiple comparators are connected.
[0026] Preferably, in the weight detection circuit for the washing machine, the resistive strain sensing module comprises multiple resistive strain gauges and a signal receiving contact. The multiple resistive strain gauges are respectively installed on the outer side of the inner drum of the washing machine, and the signal receiving contact is installed on the outer drum of the washing machine. The multiple resistive strain gauges selectively contact the signal receiving contact as the inner drum of the washing machine rotates. The signal receiving contact is connected to the first input terminal of the comparison module.
[0027] To achieve the above objectives, this utility model provides a washing machine, the washing machine comprising:
[0028] outer cylinder;
[0029] The inner cylinder is rotatably installed inside the outer cylinder;
[0030] The aforementioned weight detection circuit for a washing machine has a resistive strain sensing module installed on the outside of the inner drum.
[0031] Preferably, in the washing machine, multiple resistive strain gauges of the resistive strain sensing module in the weight detection circuit of the washing machine are symmetrically distributed on the outer side of the inner drum.
[0032] Preferably, in the washing machine, the signal receiving contact of the resistive strain sensing module in the weight detection circuit of the washing machine is installed on the outer drum and disposed near the top of the outer drum.
[0033] This utility model has at least the following beneficial effects:
[0034] This utility model provides a weight detection circuit for a washing machine, comprising a reference module, a main control module, a comparison module, and a resistive strain gauge module. The reference module provides a reference output voltage. The first input terminal of the comparison module is connected to the resistive strain gauge module, and the second input terminal of the comparison module is connected to the reference module. The positive power input terminal of the comparison module is connected to a first power source. The resistive strain gauge module is installed on the outside of the inner drum of the washing machine to sense weight and detect changes in resistance. The main control module is connected to the output terminal of the comparison module and receives the output signal from the comparison module. When the washing machine starts, the resistive strain gauge module senses weight. The clothes inside the drum press against the resistive strain gauge module, causing deformation of the strain gauge and a change in its resistance. At this time, the corresponding metal contact inside the drum and the signal receiving contact on the outer drum make contact and conduct, transmitting the signal to the first input terminal of the comparison module. The load weight can be determined by the output of the comparison module. This avoids errors in weight sensing due to poor power supply conditions or interference. Attached Figure Description
[0035] Figure 1 A schematic diagram of the weight detection circuit for a washing machine provided by this utility model;
[0036] Figure 2 for Figure 1 A schematic diagram of a weight detection circuit for a washing machine in the first embodiment;
[0037] Figure 3 for Figure 1 A schematic diagram of the weight detection circuit for a washing machine in the second embodiment;
[0038] Figure 4 A schematic diagram of a portion of the structure of the washing machine provided by this utility model;
[0039] Figure 5 for Figure 4 A schematic diagram of the middle section structure;
[0040] Figure 6 for Figure 5 A diagram from another perspective.
[0041] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0042] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The present utility model will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.
[0043] In this embodiment of the invention, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.
[0044] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.
[0045] In this embodiment of the invention, the term "multiple" refers to two or more, and other quantifiers are similar.
[0046] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.
[0047] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details are provided in the various embodiments of this utility model to facilitate a better understanding of the invention. However, the technical solutions claimed by this utility model can be implemented even without these technical details and various variations and modifications based on the following embodiments. The division of the various embodiments below is for ease of description and should not constitute any limitation on the specific implementation of this utility model. The various embodiments can be combined with and referenced by each other without contradiction.
[0048] This utility model provides a weight detection circuit for a washing machine, such as... Figures 1 to 3 As shown, the weight detection circuit for the washing machine includes a reference module, a main control module, a comparison module, and a resistive strain sensing module.
[0049] A reference module is used to provide a reference output voltage. In some implementations, the reference module may include multiple series resistors connected in series and a second power supply. The number of series resistors can be determined based on the number of load levels to be classified. For example, if the load of a washing machine is classified into large, medium, and small loads, then three series resistors are required (resistor R1, resistor R2, and resistor R3). The load classification of the washing machine can be based on specific needs, and can be divided into two (large and small loads), three, four, etc. The load weight corresponding to each category can be determined based on the maximum rated load of the washing machine. Specifically, the load weight corresponding to each category can be evenly divided according to the maximum rated load of the washing machine. For example, for a washing machine with a maximum rated load of 10 kg, when the load size is divided into two categories, [0, 5 kg) is a small load and [5 kg, 10 kg] is a large load. Another example is a washing machine with a maximum rated load of 10 kg, when the load size is divided into three categories, [0, 4 kg) is a small load, [4 kg, 7 kg) is a medium load, and [7 kg, 10 kg] is a large load.
[0050] The first input terminal of the comparison module is connected to the resistive strain sensing module, the second input terminal of the comparison module is used to connect to the reference module, and the positive power input terminal of the comparison module is connected to the first power supply.
[0051] More specifically, the comparison module includes at least one comparator, the number of which matches the number of multiple series resistors, and the second input of each comparator is connected to the common connection terminal of two adjacent series resistors.
[0052] like Figure 2 As shown, the comparison module includes a comparator IC. At this time, multiple series resistors include a first resistor R1 and a second resistor R2. The first end of the first resistor R1 is connected to the second power supply, the second end of the first resistor R1 is connected to the first end of the second resistor R2, and the second end of the second resistor R2 is grounded. The second input terminal of the comparator IC is connected to the common connection terminal of the second end of the first resistor R1 and the first end of the second resistor R2.
[0053] It should be noted that the comparator IC can be a general-purpose comparator, such as... Figure 2As shown, the comparator IC has 5 pins. Pin 3 is the non-inverting input of the comparator, and pin 1 is the inverting input. Pins 3 and 1 are used to connect to their respective inputs. Pin 2 is the negative power input of the comparator. Pin 5 is the positive power input of the comparator IC, used to provide the positive power required for normal operation. The first input of the comparator IC can be the non-inverting input, i.e., pin 3, in which case the second input is the inverting input, i.e., pin 1. In some other embodiments, the first input of the comparator IC can also be the inverting input, i.e., pin 1, in which case the second input is the non-inverting input, i.e., pin 3.
[0054] like Figure 3 As shown, the comparison module includes a first comparator IC1 and a second comparator IC2. Multiple series resistors include a first resistor R1, a second resistor R2, and a third resistor R3. The first terminal of the first resistor R1 is connected to a second power supply, the second terminal of the first resistor R1 is connected to the first terminal of the second resistor R2, the second terminal of the second resistor R2 is connected to the first terminal of the third resistor R3, and the second terminal of the third resistor R3 is grounded. The first input terminals of both the first comparator IC1 and the second comparator IC2 are connected to the strain sensing module. The second input terminal of the first comparator IC1 is connected to the common connection terminal of the second terminal of the first resistor R1 and the first terminal of the second resistor R2, and the second input terminal of the second comparator IC2 is connected to the common connection terminal of the second terminal of the second resistor R2 and the first terminal of the third resistor R3. The positive power input terminals of the first comparator IC1 and the second comparator IC2 are connected to the first power supply.
[0055] It should be noted that the first comparator IC1 and the second comparator IC2 can also be general comparators, as can be found in the description of the comparator ICs above.
[0056] A resistive strain gauge module is installed on the outside of the inner drum 2 of a washing machine to sense weight and detect changes in resistance. In some embodiments, the resistive strain gauge module includes multiple resistive strain gauges 31 and signal receiving contacts 33. The multiple resistive strain gauges 31 are respectively installed on the outside of the inner drum 2 of the washing machine, and the signal receiving contacts 33 are installed on the outer drum 1 of the washing machine. As the inner drum 2 rotates, the multiple resistive strain gauges 31 selectively contact the signal receiving contacts 33, which are connected to the first input terminal of a comparison module. In some embodiments, four resistive strain gauges 31 are evenly distributed around the periphery of the inner drum 2, and the signal receiving contacts 33 selectively contact them. Specifically, when the inner drum 2 rotates, when the metal contact 32 of one of the resistive strain gauges 31 rotates to the corresponding position of the signal receiving contact 33 and contacts it, the signal from the resistive strain gauge 31 is transmitted to the first input terminal of the comparison module through the signal receiving contact 33.
[0057] Additionally, a fourth resistor R4 is connected between the negative power input terminal of the comparator module and the first input terminal of the comparator module. The negative power input terminal of the comparator module is grounded. More specifically, the comparator module includes multiple comparators, and a fourth resistor R4 is connected between the common connection terminal to which the negative power input terminals of the multiple comparators are connected and the common connection terminal to which the first input terminals of the multiple comparators are connected.
[0058] The main control module is connected to the output of the comparator module and is used to receive the output signal from the comparator module. In some embodiments, the main control module includes a central processing unit of model A34M418YLN.
[0059] To facilitate the description of the principle of the washing machine's weight sensing, the following description will be based on the cases where the comparison module includes one comparator and two comparators.
[0060] like Figure 2 As shown, the comparison module includes a comparator IC and multiple series resistors, including a first resistor R1 and a second resistor R2. When the resistive strain sensing module undergoes deformation, the resistance value changes, and the voltage at the first input terminal of the comparator IC (taking the first input terminal as the non-inverting input terminal as an example) changes. The load weight is determined by the output of the comparator IC. At this time, the voltage at the second input terminal of the comparator IC is VCC / 2, and the input voltage at the positive power input terminal is VCC.
[0061] When the voltage at the first input terminal is greater than the voltage at the second input terminal (VCC / 2), the comparator IC outputs a high level, indicating a large load.
[0062] When the voltage at the first input terminal is less than the voltage at the second input terminal (VCC / 2), the comparator IC outputs a low level, indicating a small load.
[0063] like Figure 3 As shown, taking a comparison module including comparator IC1 and comparator IC2, and multiple series resistors including first resistor R1, second resistor R2, and third resistor R3 as an example, when the resistive strain sensing module undergoes deformation, the resistance value changes, and the voltage at the first input terminal of comparator IC1 and comparator IC2 (taking the first input terminal as the non-inverting input terminal as an example) changes. The load weight is determined by the output of comparator IC1 and comparator IC2. At this time, the voltage at the second input terminal of comparator IC1 is VCC / 3, and the voltage at the second input terminal of comparator IC2 is 2*VCC / 3. The input voltage at the positive power supply input terminal is VCC. The voltages at the first input terminals of comparator IC1 and comparator IC2 are the same, and will be directly represented by the voltage at the first input terminal below.
[0064] When the voltage at the first input terminal is less than VCC / 3, the output of comparator IC1 is low and the output of comparator IC2 is low, indicating a small load.
[0065] When VCC / 3 < voltage at the first input terminal < 2*VCC / 3, the output of comparator IC1 is high and the output of comparator IC2 is low, indicating a medium load.
[0066] When the voltage at the first input terminal is greater than 2*VCC / 3, the output of comparator IC1 and the output of comparator IC2 are both high, indicating a large load.
[0067] This invention provides a weight detection circuit for a washing machine, comprising a reference module, a main control module, a comparison module, and a resistive strain gauge module. The reference module provides a reference output voltage. The first input terminal of the comparison module is connected to the resistive strain gauge module, the second input terminal of the comparison module is connected to the reference module, and the positive power input terminal of the comparison module is connected to a first power supply. The resistive strain gauge module is installed on the outside of the inner drum of the washing machine to sense weight and detect changes in resistance. The main control module is connected to the output terminal of the comparison module to receive the output signal. When the washing machine starts, the resistive strain gauge module senses weight. The clothes inside the drum press against the resistive strain gauge module, causing deformation of the strain gauge and a change in its resistance. At this time, the metal contacts inside the drum and the signal receiving contacts on the outer drum make contact and conduct, transmitting the signal to the first input terminal of the comparison module. The load weight can be determined by the output of the comparison module. This avoids errors in weight sensing caused by poor power supply conditions or interference.
[0068] This utility model also provides a washing machine, such as Figures 4 to 6 As shown, the washing machine includes an outer drum 1, an inner drum 2, and the aforementioned weight detection circuit for the washing machine. The inner drum 2 is rotatably mounted inside the outer drum 1; the resistive strain sensing module for the weight detection circuit of the washing machine is mounted on the outside of the inner drum 2.
[0069] In the weight detection circuit of a washing machine, multiple resistive strain gauges 31 of the resistive strain sensing module are symmetrically distributed on the outer side of the inner drum 2. In some embodiments, there are four resistive strain gauges 31, which are evenly distributed around the outer periphery of the inner drum 2, and are selectively connected to a uniform signal receiving contact 33. Specifically, when the inner drum 2 rotates, when the metal contact 32 of one of the resistive strain gauges 31 rotates to the corresponding position of the signal receiving contact 33 and contacts the signal receiving contact 33, the signal from the resistive strain gauge 31 is transmitted to the first input terminal of the comparison module through the signal receiving contact 33.
[0070] Since the lower side of the outer drum 1 is easily exposed to the washing liquid, to prevent the signal receiving contact 33 of the resistive strain gauge module from contacting the washing liquid, the signal receiving contact 33 of the resistive strain gauge module in the weight detection circuit of the washing machine is mounted on the outer drum 1 and positioned near the top of the outer drum 1. However, since the resistive strain gauge 31 can only accurately weigh the clothes in the drum when it rotates to the bottom of the inner drum 2, when the resistive strain gauge 31 rotates to the bottom of the inner drum 2, the metal contact 32 corresponding to the resistive strain gauge 31 moves to the position corresponding to the signal receiving contact 33 and connects with the signal contact. In some embodiments, the resistive strain gauge 31 and the metal contact 32 can be connected by a wire.
[0071] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, those skilled in the art can make other variations or modifications without creative effort, and all such variations or modifications should fall within the protection scope of this utility model.
Claims
1. A weight detection circuit for a washing machine, characterized in that, The weight detection circuit for the washing machine includes a reference module, a main control module, a comparison module, and a resistive strain sensing module. The reference module is used to provide a reference output voltage; The first input terminal of the comparison module is connected to the resistive strain sensing module, the second input terminal of the comparison module is used to connect to the reference module, and the positive power input terminal of the comparison module is connected to the first power supply. The resistive strain sensing module is installed on the outside of the inner drum of the washing machine to sense weight and detect changes in resistance. The main control module is connected to the output terminal of the comparison module and is used to receive the output signal of the comparison module.
2. The weight detection circuit for a washing machine as described in claim 1, characterized in that, The reference module includes multiple series resistors connected in series and a second power supply; The comparison module includes at least one comparator, the number of which matches the number of multiple series resistors, and the second input terminal of each comparator is connected to the common connection terminal of two adjacent series resistors.
3. The weight detection circuit for a washing machine as described in claim 2, characterized in that, The plurality of series resistors include a first resistor and a second resistor. A first end of the first resistor is connected to a second power supply, a second end of the first resistor is connected to the first end of the second resistor, and a second end of the second resistor is grounded. The comparison module includes a comparator, the second input terminal of which is connected to the common connection terminal of the second terminal of the first resistor and the first terminal of the second resistor.
4. The weight detection circuit for a washing machine as described in claim 2, characterized in that, The plurality of series resistors include a first resistor, a second resistor, and a third resistor. A first terminal of the first resistor is connected to a second power supply. A second terminal of the first resistor is connected to a first terminal of the second resistor. A second terminal of the second resistor is connected to a first terminal of the third resistor. A second terminal of the third resistor is grounded. The comparison module includes a first comparator and a second comparator. The first input terminals of both the first and second comparators are connected to the strain sensing module. The second input terminal of the first comparator is connected to the common connection terminal of the second terminal of the first resistor and the first terminal of the second resistor. The second input terminal of the second comparator is connected to the common connection terminal of the second terminal of the second resistor and the first terminal of the third resistor. The positive power input terminals of the first and second comparators are connected to a first power supply.
5. The weight detection circuit for a washing machine as described in claim 4, characterized in that, The main control module is also configured to: When the voltage at the first input terminal is less than VCC / 3, the output terminal of the first comparator outputs a low level, and the output terminal of comparator IC2 also outputs a low level, indicating a small load. When VCC / 3 < voltage at the first input terminal < 2*VCC / 3, the output terminal of the first comparator outputs a high level, and the output terminal of the second comparator outputs a low level, indicating a medium load. When the voltage at the first input terminal is greater than 2*VCC / 3, the output terminal of the first comparator outputs a high level, and the output terminal of the second comparator outputs a high level, indicating a large load. The input voltage at the positive power input terminal is VCC; The voltages at the first input terminals of the first comparator and the second comparator are the same, and both are represented by the voltage at the first input terminal.
6. The weight detection circuit for a washing machine as described in claim 1, characterized in that, A fourth resistor is connected between the negative power input terminal of the comparison module and the first input terminal of the comparison module; The negative power input terminal of the comparison module is grounded; the comparison module includes multiple comparators, and the fourth resistor is connected between the common connection terminal to which the negative power input terminals of the multiple comparators are connected and the common connection terminal to which the first input terminals of the multiple comparators are connected.
7. The weight detection circuit for a washing machine as described in claim 1, characterized in that, The resistive strain sensing module comprises multiple resistive strain gauges and signal receiving contacts. The multiple resistive strain gauges are respectively installed on the outer side of the inner drum of the washing machine, and the signal receiving contacts are installed on the outer drum of the washing machine. The multiple resistive strain gauges selectively contact the signal receiving contacts as the inner drum of the washing machine rotates. The signal receiving contacts are connected to the first input terminal of the comparison module.
8. A washing machine, characterized in that, include: outer cylinder; The inner cylinder is rotatably installed inside the outer cylinder; The weight detection circuit for a washing machine as described in claims 1 to 7, wherein the resistive strain sensing module of the weight detection circuit for the washing machine is installed on the outside of the inner drum.
9. The washing machine as described in claim 8, characterized in that, In the weight detection circuit of the washing machine, multiple resistive strain gauges of the resistive strain sensing module are symmetrically distributed on the outer side of the inner drum.
10. The washing machine as described in claim 8, characterized in that, In the weight detection circuit of a washing machine, the signal receiving contacts of the resistive strain sensing module are mounted on the outer drum and positioned near the top of the outer drum.