Level conversion circuit and electrical equipment

Abstract

The utility model provides a level conversion circuit and electrical equipment, and the level conversion circuit comprises a first module, a second module, a level conversion module, a first power supply, and a second power supply. The level conversion module comprises a first end, a second end, a third end and a fourth end; the first end is connected with the transmitting end of the first module and the first power supply, the second end is connected with the receiving end of the second module and the second power supply, and the third end is connected with the receiving end of the first module and the first power supply. The fourth end is connected with the transmitting end of the second module and the second power supply; the level conversion module is configured to supply power to the second module through the second power supply when the sending end of the first module outputs high level, and supply power to the first module through the first power supply when the sending end of the second module outputs high level. According to the invention, level conversion between different modules is effectively realized.

Description

Technical Field

[0001] The present disclosure relates to the field of electronic circuits, and in particular to a level conversion circuit and an electrical device. Background Art

[0002] With the continuous advancement of science and technology, many electrical appliances that bring convenience to users are widely used, such as washing machines and washer-dryers. For some electrical devices, the main control module needs to communicate with various peripheral modules to implement different functions. For example, communication between the main control module and the Wi-Fi module, or between the main control module and the display driver module, etc. Because different modules may have different voltage requirements, achieving communication between modules requires level conversion. Therefore, how to implement level conversion between modules is a pressing problem. Utility Model Content

[0003] In a first aspect, the present disclosure provides a level conversion circuit, comprising:

[0004] A first module, a second module, a level conversion module, a first power supply, and a second power supply;

[0005] The level conversion module includes a first end, a second end, a third end and a fourth end;

[0006] The first end is connected to the transmitting end of the first module and the first power supply, the second end is connected to the receiving end of the second module and the second power supply, the third end is connected to the receiving end of the first module and the first power supply, and the fourth end is connected to the transmitting end of the second module and the second power supply;

[0007] The level conversion module is configured to supply power to the second module through the second power supply when the transmitting end of the first module outputs a high level, and to supply power to the first module through the first power supply when the transmitting end of the second module outputs a high level.

[0008] In some embodiments, the level conversion module includes a first switching device and a second switching device; the first end is the first control end of the first switching device, the second end is the first connection end of the first switching device, the third end is the second control end of the second switching device, and the fourth end is the second connection end of the second switching device.

[0009] In some embodiments, the first switching device is a first field effect transistor, the first control terminal includes a first gate and a first source of the first field effect transistor, and the first connection terminal is a first drain of the first field effect transistor.

[0010] In some embodiments, the first source is connected to the transmitting end of the first module, the first source is connected to the first power supply through a first resistor, the first gate is connected to the first power supply, the first drain is connected to the receiving end of the second module through a second resistor, and the first drain is connected to the second power supply through a third resistor.

[0011] In some embodiments, the second switching device is a second field effect transistor, the second control terminal includes a second gate and a second source of the second field effect transistor, and the second connection terminal is a second drain of the second field effect transistor.

[0012] In some embodiments, the second source is connected to the receiving end of the first module, the second source is connected to the first power supply through a fourth resistor, the second gate is connected to the first power supply, the second drain is connected to the transmitting end of the second module through a fifth resistor, and the second drain is connected to the second power supply through a sixth resistor.

[0013] In some embodiments, the level conversion module is an integrated module integrating the first switching device and the second switching device.

[0014] In some embodiments, the level conversion circuit includes a plurality of the level conversion modules, a plurality of second modules communicating with the first modules, and at least one second power supply;

[0015] The first module is connected to each level conversion module, each level conversion module is connected to a second module and a second power supply respectively, and each level conversion module is connected to a different second module.

[0016] In some embodiments, the level conversion circuit is applied to a washing machine, and the first module is a main control module of the washing machine.

[0017] In a second aspect, the present disclosure provides an electrical device, comprising the level conversion circuit provided in the first aspect of the present disclosure.

[0018] In some embodiments, the electrical appliance is a washing machine.

[0019] One or more technical solutions provided by this disclosure achieve at least the following technical effects or advantages:

[0020] The level conversion circuit provided by the present disclosure includes a first module, a second module, a level conversion module, a first power supply and a second power supply; the level conversion module includes a first end, a second end, a third end and a fourth end; the first end is connected to the transmitting end of the first module and the first power supply, the second end is connected to the receiving end of the second module and the second power supply, the third end is connected to the receiving end of the first module and the first power supply, and the fourth end is connected to the transmitting end of the second module and the second power supply. When the operating voltages of the first module and the second module are different, the level conversion can be achieved through the level conversion module, wherein when the transmitting end of the first module outputs a high level, the level conversion module can be used to supply power to the second module through the second power supply, and when the transmitting end of the second module outputs a high level, the level conversion module can be used to supply power to the first module through the first power supply. Therefore, the level conversion circuit provided by the present disclosure can effectively achieve level conversion between different modules, ensuring normal communication between modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic structural diagram of a level conversion circuit according to some embodiments of the present disclosure is shown;

[0022] Figure 2 A schematic diagram of a level conversion circuit is shown when the level conversion module of some embodiments of the present disclosure is an integrated module;

[0023] Figure 3 A schematic diagram of a level conversion circuit is shown when the level conversion module of some embodiments of the present disclosure includes an independent first switching device and an independent second switching device;

[0024] Figure 4 A schematic diagram of an electrical device according to some embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0025] In order to better understand the above technical solution, the technical solution of the embodiment of the present invention is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the specific features in the embodiment of the present invention are detailed descriptions of the technical solution, rather than limitations of the technical solution of the present invention. In the absence of conflict, the technical features in the embodiment of the present invention can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0027] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0028] In addition, in this utility model, the descriptions of "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0029] Figure 1 FIG. 1 shows a schematic diagram of a level conversion circuit provided by an embodiment of the present disclosure. Figure 1 As shown, the level conversion circuit 100 provided by the present disclosure may include: a first module 200, a second module 300 communicating with the first module 200, a level conversion module 400, a first power supply 500, and a second power supply 600. The level conversion module includes a first end, a second end, a third end, and a fourth end. The first end is connected to the transmitting end TX1 of the first module 200 and the first power supply 500, the second end is connected to the receiving end RX2 of the second module 300 and the second power supply 600, the third end is connected to the receiving end RX1 of the first module 200 and the first power supply 500, and the fourth end is connected to the transmitting end TX2 of the second module 300 and the second power supply 600.

[0030] In the embodiments of this specification, the level conversion circuit can be applied to electrical devices, such as washing machines and washer-dryers. Taking a washing machine as an example, the first module 200 and the second module 300 can be modules that implement different functions within the washing machine. In some embodiments, the first module 200 can be the main control module of the device, such as a washing machine, and the second module 300 can be any peripheral module within the device that can communicate with the main control module, such as a Wi-Fi module or a display driver module.

[0031] It should be noted that the voltages required by the first module 200 and the second module 300 are different. For example, the supply voltage corresponding to the first module 200 is 5 V, and the supply voltage corresponding to the second module 300 is 3.3 V. To achieve level conversion between the first module 200 and the second module 300, in the embodiments of this specification, a level conversion circuit is used to achieve level conversion between the two.

[0032] In the embodiment of this specification, when the transmitting end of the first module 200 outputs a high level, the level conversion module 400 can be used to power the second module 300 through the second power supply 600, that is, the receiving end of the second module 300 receives a high level from the second power supply 600, and when the transmitting end of the first module 200 outputs a low level, the level conversion module 400 can be used to enable the receiving end of the second module 300 to receive a low level.

[0033] When the transmitting end of the second module 300 outputs a high level, the level conversion module 400 can be used to power the first module 200 through the first power supply 500, that is, the receiving end of the first module 200 receives a high level from the first power supply 500. When the transmitting end of the second module 300 outputs a low level, the level conversion module 400 can be used to enable the receiving end of the first module 200 to receive a low level.

[0034] In some embodiments, the level conversion module 400 may include a first switching device and a second switching device. The first terminal is a first control terminal of the first switching device, the second terminal is a first connection terminal of the first switching device, the third terminal is a second control terminal of the second switching device, and the fourth terminal is a second connection terminal of the second switching device.

[0035] Then, the connection between each device in the level conversion circuit and the level conversion module 400 can be as follows: the first control terminal of the first switching device is connected to the transmitting end of the first module 200 and the first power supply 500, and the first connection terminal of the first switching device is connected to the receiving end of the second module 300 and the second power supply 600. The second control terminal of the second switching device is connected to the receiving end of the first module 200 and the first power supply 500, and the second connection terminal of the second switching device is connected to the transmitting end of the second module 300 and the second power supply 600.

[0036] Specifically, when the transmitting end of the first module 200 outputs a high level, the first switch device is in the off state, and power is supplied to the second module 300 via the second power supply 600. When the transmitting end of the first module 200 outputs a low level, the first switch device is in the on state, and at this time, the receiving end of the second module 300 also receives a low level.

[0037] When the transmitting end of the second module 300 outputs a high level, the second switch device is in the off state, and power is supplied to the first module 200 via the first power supply 500. When the transmitting end of the second module 200 outputs a low level, the second switch device is in the on state, and at this time, the receiving end of the first module 200 also receives a low level.

[0038] It should be noted that the types of the first switching device and the second switching device can be selected according to actual needs. In some embodiments, the first switching device and the second switching device are both field-effect transistors, such as metal-oxide-semiconductor field-effect transistors (MOSFETs). In some embodiments, the first switching device is a field-effect transistor, and the second switching device is another type of switching device. In some embodiments, the second switching device is a field-effect transistor, and the first switching device is another type of switching device.

[0039] In the embodiments of this specification, to simplify wiring and reduce PCB layout space, the level conversion module 400 can be an integrated module that integrates a first switch device and a second switch device. Of course, the level conversion module 400 can also be composed of independent first and second switch devices, which is not limited here.

[0040] like Figure 2 , which is a schematic diagram of a level conversion circuit when the level conversion module provided in some embodiments of the present disclosure is an integrated module. For ease of explanation, the first switching device is a first field effect transistor and the second switching device is a second field effect transistor as an example.

[0041] Please refer to Figure 2 , when the first switching device is a first field effect transistor, the first control terminal includes a first gate and a first source of the first field effect transistor, and the first connection terminal is a first drain of the first field effect transistor. Figure 2 In the embodiment, the level conversion module includes pins G1, S1, and D1, wherein G1 corresponds to the first gate, S1 corresponds to the first source, and D1 corresponds to the first drain.

[0042] Furthermore, the first source S1 is connected to the transmitting end of the first module 200, the first source S1 is connected to the first power supply 500 through the first resistor, the first gate G1 is connected to the first power supply 500, the first drain D1 is connected to the receiving end of the second module through the second resistor, and the first drain D1 is connected to the second power supply 600 through the third resistor. Figure 2 In the example, the transmitting end of the first module 200 is represented by MODEL1-TX, the receiving end of the second module 300 is represented by MODEL2-RX, the first power supply is represented by VCC1, the second power supply is represented by VCC2, and the first resistor corresponds to Figure 2 The second resistor corresponds to R88 in Figure 2 R91 in the third resistor corresponds to Figure 2 The R86 in.

[0043] It should be noted that the first power supply 500 may be a power supply adapted to the operating voltage of the first module 200, and the second power supply 600 may be a power supply adapted to the operating voltage of the second module 300. In some embodiments, if the operating voltage of the first module 200 is 5V, the first power supply 500 may be a voltage source providing 5V, and if the operating voltage of the second module 300 is 3.3V, the second power supply 600 may be a voltage source providing 3.3V.

[0044] like Figure 2 As shown, when the first module 200 sends data to the second module 300, if the first module 200 sends a high level, that is, MODEL1-TX sends a high level, the voltage difference between the first gate G1 and the first source S1 cannot turn on the first field effect transistor, and the first field effect transistor is in a disconnected state. At this time, the receiving end of the second module 300, that is, MODEL2-RX, receives a high level from the pull-up resistor R86.

[0045] If the first module 200 sends a low level, that is, MODEL1-TX sends a low level, there is a voltage difference between the first gate G1 and the first source S1, which turns on the first field effect transistor, and the receiving end of the second module 300, that is, MODEL2-RX, receives a low level.

[0046] If the second switching device is a second field effect transistor, the second control terminal includes the second gate and the second source of the second field effect transistor, and the second connection terminal is the second drain of the second field effect transistor. Figure 2 In the embodiment, the level conversion module includes pins G2, S2, and D2, wherein G2 corresponds to the second gate, S2 corresponds to the second source, and D1 corresponds to the second drain.

[0047] like Figure 2 As shown, the second source S2 is connected to the receiving end of the first module 200, the second source S2 is connected to the first power supply 500 through the fourth resistor, the second gate G2 is connected to the first power supply 500, the second drain D2 is connected to the transmitting end of the second module 300 through the fifth resistor, and the second drain D2 is connected to the second power supply 600 through the sixth resistor. It should be noted that the second drain D2 can be connected to the second power supply 600 only through the sixth resistor, or the second drain D2 can be connected to the second power supply 600 through the sixth resistor and other devices, such as Figure 2 In the embodiment, the second power supply 600 is connected via the fifth resistor and the sixth resistor. Figure 2In the example, the receiving end of the first module 200 is represented by MODEL1-RX, the transmitting end of the second module 300 is represented by MODEL2-TX, and the fourth resistor corresponds to Figure 2 R92 in the fifth resistor corresponds to Figure 2 R93 in the figure, the sixth resistor corresponds to Figure 2 R89 in.

[0048] like Figure 2 As shown, when the second module 300 sends data to the first module 200, if the second module 300 sends a high level, that is, MODEL2-TX sends a high level, since the voltage difference between the second gate G2 and the second source S2 at this time cannot turn on the second field effect transistor, the second field effect transistor is in a disconnected state, and the receiving end of the first module 200, that is, MODEL1-RX, receives a high level from the pull-up resistor R92.

[0049] If the second module 300 sends a low level, that is, MODEL2-TX sends a low level, due to the parasitic diode characteristics of the second field effect tube, the level of the receiving end of the first module 200 will be pulled down, so that the second field effect tube is turned on, that is, MODEL1-RX receives a low level.

[0050] In other embodiments, the level conversion module may be composed of independent first switching devices and second switching devices. Figure 3 , a schematic diagram of a level conversion circuit illustrating a level conversion module according to some embodiments of the present disclosure, wherein the level conversion module includes an independent first switching device and an independent second switching device. For ease of explanation, the first switching device is still a first field-effect transistor, and the second switching device is a second field-effect transistor.

[0051] like Figure 3 As shown, the first switch device corresponds to the first field effect transistor Q13, the second switch device corresponds to the second field effect transistor Q12, and the first power supply 500 corresponds to Figure 3 The second power supply 600 corresponds to VCC1 in Figure 3 VCC2 in.

[0052] For the first field effect transistor Q13, the gate and source of Q13 correspond to the first control terminal of the first switching device, and the drain of Q13 corresponds to the first connection terminal of the first switching device. The source of Q13 is connected to the transmitting end of the first module 200, the source of Q13 is connected to the first power supply 500 through the first resistor, the gate of Q13 is connected to the first power supply 500, the drain of Q13 is connected to the receiving end of the second module 300 through the second resistor, and the drain of Q13 is connected to the second power supply 600 through the third resistor. Figure 3 In the example, the transmitting end of the first module 200 is represented by MODEL1-TX, the receiving end of the second module 300 is represented by MODEL2-RX, and the first resistor corresponds to Figure 3 The second resistor corresponds to R85 in Figure 2 R90 in the third resistor corresponds to Figure 2 R87 in.

[0053] Q13 can be used to convert the output level of the first module 200. When the first module 200 outputs a high level, the source and drain of Q13 are disconnected, that is, Q13 is in an off state, and the receiving end of the second module 300 receives a high level from the pull-up resistor R87.

[0054] When the first module 200 outputs a low level, the source and drain of Q13 are connected, that is, Q13 is in a conducting state. At this time, the receiving end of the second module 300 receives a low level.

[0055] For the second field effect transistor Q12, the gate and source of Q12 correspond to the second control terminal of the second switching device, and the drain of Q12 corresponds to the first connection terminal of the second switching device. The source of Q12 is connected to the receiving end of the first module 200, the source of Q12 is connected to the first power supply 500 through the fourth resistor, the gate of Q12 is connected to the first power supply 500, the drain of Q12 is connected to the transmitting end of the second module 300 through the fifth resistor, and the drain of Q12 is connected to the second power supply 600 through the sixth resistor. Figure 3 In the example, the receiving end of the first module 200 is represented by MODEL1-RX, the receiving end of the second module 300 is represented by MODEL2-TX, and the fourth resistor corresponds to Figure 3 R82 in the fifth resistor corresponds to Figure 2 R84 in the sixth resistor corresponds to Figure 2 R83 in.

[0056] Q12 can be used to convert the output level of the second module 300. When the second module 300 outputs a high level, Q12 is disconnected, and the receiving end of the first module 200 receives the high level from the pull-up resistor R82.

[0057] When the second module 300 outputs a low level, VCC1 passes through the resistor R82 and the diode to form a loop. Due to the characteristics of the diode, there is a voltage drop across the diode (such as a voltage drop of 0.7V), which pulls down the level of the receiving end of the first module 200, that is, the level received by the second module 200 is a low level.

[0058] In summary, the level conversion circuit provided in the embodiments of this specification can effectively implement level conversion between the first module and the second module.

[0059] It should be noted that if there are multiple groups of modules that need to be level-converted, multiple level-conversion modules can be set in the level-conversion circuit as needed. In some embodiments, the level-conversion circuit may include multiple level-conversion modules 400, multiple second modules 300 communicating with the first module 200, and at least one second power supply 600; the first module 200 is connected to each level-conversion module 400, and each level-conversion module 400 is respectively connected to a second module 300 and a second power supply 600, and each level-conversion module is connected to a different second module 300.

[0060] For example, if the first module 200 is the main control module of the washing machine, the multiple second modules 300 can be multiple peripheral modules that communicate with the main control module. For example, the multiple second modules include the WIFI module, display driver module, and reminder module of the washing machine, then three level conversion modules can be set in the level conversion circuit, which are respectively used to realize the level conversion between the main control module and the WIFI module, the level conversion between the main control module and the display driver module, and the level conversion between the main control module and the reminder module. It should be noted that if the working voltage of each second module is different, a corresponding second power supply can be set for each second module, and each second power supply can provide a corresponding voltage to each second module. If some second modules have the same working voltage, a second power supply can be shared for multiple second modules with the same working voltage. When there are multiple level conversion modules and multiple second modules, the level conversion circuit can refer to the above Figure 2 、 Figure 3 The connection method shown is not described here in detail.

[0061] In other embodiments, the level conversion circuit may further include multiple first modules, multiple level conversion modules, and multiple second modules. That is, the level conversion circuit includes multiple groups of communicating modules. For example, the multiple first modules include module 1 and module 4, and the multiple second modules include module 2 and module 3, wherein module 1 communicates with module 2, module 1 communicates with module 3, and module 4 communicates with module 5. In this case, the circuit may include three level conversion modules: module 1 may be connected to module 2 via a level conversion module, module 1 may be connected to module 3 via a level conversion module, and module 4 may be connected to module 5 via a level conversion module. That is, for each group of communicating modules, if the operating voltages between the modules are different, level conversion between the modules can be achieved using the level conversion modules provided in the embodiments of this specification to ensure the normal operation of each module.

[0062] It is understood that the level conversion circuit in the embodiments of this specification can be configured with a number of level conversion modules as needed. When there are multiple level conversion modules, the multiple level conversion modules can be integrated into a single chip. Of course, each level conversion module can also be configured as an independent module, which is not limited here.

[0063] In summary, the level conversion circuit provided in the embodiments of this specification can effectively achieve level conversion between modules with different voltage requirements. In addition, when an integrated level conversion module is used, the layout space of the PCB board can be greatly reduced, simplifying the wiring. The level conversion circuit provided in the embodiments of this specification uses simple components. The level conversion between modules can also be applied in high baud rate scenarios by using field-effect transistors, and can adapt to level conversion under high-speed data transmission.

[0064] Based on the same inventive concept, some embodiments of the present disclosure further provide an electrical device, such as Figure 4 , which is a schematic diagram of an electrical device provided in some embodiments of the present disclosure, wherein the electrical device 700 includes the above-mentioned level conversion circuit.

[0065] In some embodiments, electrical device 700 is a washing machine. It should be noted that electrical device 700 may include a main body. In the case of a washing machine, the main body may include, but is not limited to, a housing, a touch screen, a washing tub disposed within the housing for accommodating clothes, and a main motor for driving the washing tub. The level conversion circuit may be disposed within the housing and electrically connected to the main body.

[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0067] In addition, the technical solutions of the various embodiments may be combined with each other, but this must be based on the fact that they can be implemented by a person of ordinary skill in the art. If the combination of technical solutions is mutually inconsistent or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application. Although the exemplary embodiments of the present disclosure have been described, those skilled in the art may make additional changes and modifications to these embodiments once they understand the basic inventive concepts. Therefore, the appended claims are intended to be interpreted as including the exemplary embodiments and all changes and modifications that fall within the scope of the present disclosure.

Claims

1. A level conversion circuit, characterized in that: include: A first module, a second module, a level conversion module, a first power supply, and a second power supply; The level conversion module includes a first end, a second end, a third end and a fourth end; The first end is connected to the transmitting end of the first module and the first power supply, the second end is connected to the receiving end of the second module and the second power supply, the third end is connected to the receiving end of the first module and the first power supply, and the fourth end is connected to the transmitting end of the second module and the second power supply; The level conversion module is configured to supply power to the second module through the second power supply when the transmitting end of the first module outputs a high level, and to supply power to the first module through the first power supply when the transmitting end of the second module outputs a high level.

2. The level conversion circuit according to claim 1, wherein: The level conversion module includes a first switching device and a second switching device; The first end is the first control end of the first switching device, the second end is the first connection end of the first switching device, the third end is the second control end of the second switching device, and the fourth end is the second connection end of the second switching device.

3. The level conversion circuit according to claim 2, wherein: The first switching device is a first field effect transistor, the first control end includes a first gate and a first source of the first field effect transistor, and the first connection end is a first drain of the first field effect transistor.

4. The level conversion circuit according to claim 3, wherein: The first source is connected to the transmitting end of the first module, the first source is connected to the first power supply through a first resistor, the first gate is connected to the first power supply, the first drain is connected to the receiving end of the second module through a second resistor, and the first drain is connected to the second power supply through a third resistor.

5. The level conversion circuit according to any one of claims 2 to 4, wherein: The second switching device is a second field effect transistor, the second control terminal includes a second gate and a second source of the second field effect transistor, and the second connection terminal is a second drain of the second field effect transistor.

6. The level conversion circuit according to claim 5, wherein: The second source is connected to the receiving end of the first module, the second source is connected to the first power supply through a fourth resistor, the second gate is connected to the first power supply, the second drain is connected to the transmitting end of the second module through a fifth resistor, and the second drain is connected to the second power supply through a sixth resistor.

7. The level conversion circuit according to claim 2, wherein: The level conversion module is an integrated module integrating the first switching device and the second switching device.

8. The level conversion circuit according to claim 1, wherein: The level conversion circuit includes a plurality of the level conversion modules, a plurality of second modules communicating with the first modules, and at least one second power supply; The first module is connected to each level conversion module, each level conversion module is connected to a second module and a second power supply respectively, and each level conversion module is connected to a different second module.

9. The level conversion circuit according to claim 1, wherein: The level conversion circuit is applied to a washing machine, and the first module is a main control module of the washing machine.

10. An electrical device, characterized in that: The method comprises the level conversion circuit according to any one of claims 1 to 9.

11. The electrical device according to claim 10, wherein: The electrical appliance is a washing machine.

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