Water level detection circuit, water level detection method and electric appliance

Abstract

The invention relates to the technical field of water level detection, and discloses a water level detection circuit, a water level detection method and an electric appliance. The water level detection circuit is formed by arranging the signal sending probe, the at least one signal receiving probe, the control module and the isolation module. The control module sends a detection signal to the signal receiving probe and receives a water level signal fed back by the signal sending probe so as to detect the water level of the water storage tank. The isolation module electrically isolates the signal receiving probe from the control module, and the isolation module electrically isolates the signal sending probe from the control module; namely, the isolation module enables the control module and the water level probe not to be actually electrically connected, so that electrolytic oxidation caused by long-term electrification of the water level probe can be avoided, the service life of the water level probe is prolonged, and the reliability of a product is improved.

Description

Technical Field

[0001] The present application relates to the technical field of water level detection, and in particular to a water level detection circuit, a water level detection method and an electrical appliance. Background Art

[0002] Water level detection technology is used in many areas of life, and probe-type water level detection is a commonly used method. Probe-type water level detection usually sets a water level probe in the container where the water level needs to be monitored, and detects whether the water is submerged in the monitoring end of the water level probe by detecting the change in the resistance value between the water level probes, thereby judging whether the water level has reached the detected position. However, the water level probe of the traditional probe-type water level detection circuit is usually connected to direct current, which will cause electrolytic oxidation of the water level probe, thereby greatly shortening the service life of the water level probe and reducing the reliability of the product. Summary of the invention

[0003] The present application proposes a water level detection circuit, a water level detection method and an electrical appliance, aiming to extend the service life of a water level probe and thereby improve the reliability of the product.

[0004] In a first aspect, the present application provides a water level detection circuit, comprising:

[0005] Water storage tanks;

[0006] A water level probe, which is disposed in the water storage tank and includes a signal sending probe and at least one signal receiving probe;

[0007] A control module, the control module is used to send a detection signal to the signal receiving probe, and receive a water level signal fed back by the signal sending probe to detect the water level of the water storage tank; and

[0008] An isolation module, the water level probe is connected to the control module through the isolation module, and the isolation module is used to electrically isolate the water level probe from the control module.

[0009] Optionally, in the water level detection circuit provided in the present application, the control module is provided with a signal input terminal and at least one signal output terminal;

[0010] The isolation module includes a first isolation unit and at least one second isolation unit;

[0011] The signal input end is connected to one end of the first isolation unit, and the other end of the first isolation unit is connected to the signal sending probe;

[0012] A signal output end is connected to one end of a corresponding second isolation unit, and the other end of a corresponding second isolation unit is connected to a corresponding signal receiving probe.

[0013] Optionally, in the water level detection circuit provided in the present application, the control module is provided with a signal input terminal, a signal output terminal and at least one control signal terminal;

[0014] The isolation module comprises a first isolation unit, a second isolation unit and at least one switch unit, wherein the switch unit is provided with an input end, an output end and a control end;

[0015] The signal input end is connected to one end of the first isolation unit, and the other end of the first isolation unit is connected to the signal sending probe;

[0016] The signal output end is connected to one end of the second isolation unit, the other end of the second isolation unit is connected to the input ends of all the switch units, the output end of one of the switch units is connected to the corresponding signal receiving probe, and the control end of one of the switch units is connected to the corresponding control signal end.

[0017] Optionally, in the water level detection circuit provided in the present application, the first isolation unit is a photoelectric isolator, a transformer isolator, a capacitor isolator or a magnetic isolator; and / or

[0018] The second isolation unit is a photoelectric isolator, a transformer isolator, a capacitor isolator or a magnetic isolator.

[0019] Optionally, in the water level detection circuit provided in the present application, the first isolation unit is used to electrically isolate the signal sending probe from the control module; the second isolation unit is used to electrically isolate the signal receiving probe from the control module.

[0020] Optionally, in the water level detection circuit provided in the present application, the switch unit is a low-temperature polysilicon thin film transistor, an oxide semiconductor thin film transistor or an amorphous silicon thin film transistor.

[0021] Optionally, in the water level detection circuit provided in the present application, the control module includes a signal generating unit and a signal detecting unit;

[0022] The signal generating unit is used to generate the detection signal; the signal detecting unit is used to detect the water level signal.

[0023] Optionally, in the water level detection circuit provided in the present application, the isolation module includes a first isolation unit, a second isolation unit and a control unit;

[0024] The first isolation unit is used to electrically isolate the water level probe from the control module; the second isolation unit is used to electrically isolate the water level probe from the control module;

[0025] The control unit is used to control the first isolation unit and the second isolation unit to work alternately.

[0026] In a second aspect, the present application further provides a water level detection method, which is used in the water level detection circuit as described above, and the water level detection method comprises:

[0027] The control module sends a detection signal to the signal receiving pin through the isolation module;

[0028] The signal sending needle feeds back the water level signal to the control module through the isolation module; and

[0029] The control module detects the water level of the water storage tank according to the water level signal.

[0030] In a third aspect, the present application also provides an electrical appliance, which includes the water level detection circuit described in the above item.

[0031] The present application forms a water level detection circuit by setting a signal sending probe, at least one signal receiving probe, a control module and an isolation module. Among them, the control module sends a detection signal to the signal receiving probe, and receives the water level signal fed back by the signal sending probe to detect the water level of the water storage tank. The isolation module electrically isolates the signal receiving probe from the control module, and the isolation module electrically isolates the signal sending probe from the control module; that is, the isolation module makes there is no actual electrical connection between the control module and the water level probe, so as to avoid electrolytic oxidation caused by long-term power-on of the water level probe, extend the service life of the water level probe, and thus improve the reliability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] in:

[0034] Figure 1 A first schematic diagram of a water level detection circuit provided in an embodiment of the present application;

[0035] Figure 2 A second schematic diagram of a water level detection circuit provided in an embodiment of the present application;

[0036] Figure 3 A third schematic diagram of a water level detection circuit provided in an embodiment of the present application;

[0037] Figure 4A schematic diagram of the structure of a control module in a water level detection circuit provided in an embodiment of the present application;

[0038] Figure 5 A schematic diagram of the structure of an isolation module in a water level detection circuit provided in an embodiment of the present application;

[0039] Figure 6 A schematic diagram of a flow chart of a water level detection method provided in an embodiment of the present application;

[0040] Figure 7 A schematic diagram of an electrical appliance provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] In addition, the described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced while omitting one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other cases, known structures, methods, devices, implementations, materials or operations are not shown or described in detail to avoid obscuring various aspects of the present disclosure.

[0043] In the present disclosure, unless otherwise clearly specified and limited, the terms "connected", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be an electrical connection, or it can communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0044] In addition, in the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically limited. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist, such as A and / or B, which may indicate the existence of A alone, B alone, and the simultaneous existence of A and B. The symbol " / " generally indicates that the objects associated with each other are in an "or" relationship. The terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0045] The embodiments of the present application are described in detail below, and the embodiments of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0046] See also Figure 1 , Figure 1 This is a first schematic diagram of a water level detection circuit provided in an embodiment of the present application. Figure 1 As shown, the water level detection circuit 10 provided in the embodiment of the present application includes a water tank 101, a water level probe 102, a control module 104 and an isolation module 103. The water level probe 102 is arranged in the water tank 101, and the water level probe 102 includes a signal sending probe 1021 and at least one signal receiving probe 1022. The water level probe 102 is connected to the control module 104 through the isolation module 103. The control module 104 is used to send a detection signal to the signal receiving probe 1022, and receive a water level signal fed back by the signal sending probe 1021 to detect the water level of the water tank 101. The isolation module 103 is used to electrically isolate the water level probe 102 from the control module 104.

[0047] It should be noted that electrical isolation refers to a method of preventing current from flowing directly from one area to another in a circuit, that is, not establishing a direct current flow path between two areas. Although current cannot flow directly, energy or information can still be transmitted through other means, such as electromagnetic induction or electromagnetic waves, or by optical, acoustic or mechanical means.

[0048] The number of water level probes 102 can be set according to the needs of the product. For example, a low-range water level, a mid-range water level, and a high-range water level are set in the product. In this case, the number of water level probes 102 is 4, 1 of which is a signal sending probe 1021, and the remaining 3 are signal receiving probes 1022. The 3 signal receiving probes 1022 extend to 3 different positions in the water storage tank 101, respectively, to represent the low-range water level, the mid-range water level, and the high-range water level.

[0049] In the related art, the shell of the water tank is grounded as the reference potential. When the liquid level in the water tank is above the water level probe, the potential on the corresponding probe changes, and the control module determines the water level based on this potential change. However, since there is always a potential difference between the water level probe and the shell of the water tank and the water level probe, there is always current flowing between the water level probe and the water tank, and between the water level probe and the water level probe. This current will cause electrolytic oxidation of the probe, and finally the probe will be completely corroded and fail.

[0050] Based on this, the water level detection circuit 10 provided in the embodiment of the present application forms a water level detection circuit 10 by setting a signal sending probe 1022, at least one signal receiving probe 1021, a control module 104 and an isolation module 103. Among them, the control module 104 sends a detection signal to the signal receiving probe 1022, and receives the water level signal fed back by the signal sending probe 1021 to detect the water level of the water storage tank 101. The isolation module 103 electrically isolates the signal receiving probe 1022 from the control module 104, and the isolation module 103 electrically isolates the signal sending probe 1021 from the control module 104; that is, the isolation module 103 makes there is no actual electrical connection between the control module 104 and the water level probe 102, so as to avoid electrolytic oxidation caused by long-term power-on of the water level probe 102, extend the service life of the water level probe 102, and thus improve the reliability of the product.

[0051] Optionally, in some embodiments of the present application, please refer to Figure 2 . Figure 2 This is a second schematic diagram of a water level detection circuit provided in an embodiment of the present application. Figure 2 As shown, Figure 2 The water level detection circuit 20 shown will Figure 1 The water level detection circuit 10 shown in FIG. is described in detail as follows:

[0052] The control module 103 is provided with a signal input terminal A and at least one signal output terminal B. The isolation module 103 includes a first isolation unit 1031 and at least one second isolation unit 1032. The signal input terminal A is connected to one end of the first isolation unit 1031, and the other end of the first isolation unit 1031 is connected to the signal sending probe 1021. A signal output terminal B is connected to one end of a corresponding second isolation unit 1032, and the other end of a corresponding second isolation unit 1032 is connected to a corresponding signal receiving probe 1022.

[0053] Specifically, the signal input terminal A is connected to the signal sending probe 1021 via a first isolation unit 1031. Each signal output terminal B is connected to the corresponding signal receiving probe 1022 via a corresponding second isolation unit 1032. Through such a setting, it can be ensured that there is no actual electrical connection between the control module 104 and the water level probe 102, thereby avoiding electrolytic oxidation caused by long-term power-on of the water level probe 102, extending the service life of the water level probe 102, and thus improving the reliability of the product.

[0054] It is understandable that the control module 104 can send a detection signal to each signal receiving probe 1022 in turn through at least one signal output terminal B, and judge whether the water in the water storage tank 101 at this time submerges the corresponding water level receiving probe 1022 according to the water level signal fed back by the signal sending probe 1021, so as to detect the water level of the water storage tank 101. It is understandable that the control module 104 is the core part of the water level detection circuit, which is responsible for generating a detection signal, sending it to the signal receiving probe, and then receiving the water level signal fed back by the signal sending probe, and detecting the water level of the water storage tank accordingly.

[0055] Optionally, in some embodiments of the present application, please refer to Figure 3 . Figure 3 This is a third schematic diagram of a water level detection circuit provided in an embodiment of the present application. Figure 3 As shown, Figure 3 The water level detection circuit 30 shown will Figure 1 The water level detection circuit 10 shown in FIG. is described in detail as follows:

[0056] The control module 104 is provided with a signal input terminal A, a signal output terminal B and at least one control signal terminal C. The isolation module 103 includes a first isolation unit 1031, a second isolation unit 1032 and at least one switch unit 1033. The switch unit 1033 is provided with an input terminal D1, an output terminal D2 and a control terminal D3. The signal input terminal A is connected to one end of the first isolation unit 1031, and the other end of the first isolation unit 1031 is connected to the signal sending probe 1021. The signal output terminal B is connected to one end of the second isolation unit 1032, and the other end of the second isolation unit 1032 is connected to the input terminal D1 of all the switch units 1033. The output terminal D2 of a switch unit 1033 is connected to the corresponding signal receiving probe 1022, and the control terminal D3 of a switch unit 1033 is connected to the corresponding control signal terminal C.

[0057] Specifically, the signal input terminal A is connected to the signal transmitting probe 1021 through the first isolation unit 1031. The signal output terminal B is connected to each signal receiving probe 1022 through the second isolation unit 1032, and each signal receiving probe 1022 is also connected to the second isolation unit 1032 through a corresponding switch unit 1033. Through such a setting, it can be ensured that there is no actual electrical connection between the control module 104 and the water level probe 102, thereby avoiding electrolytic oxidation caused by long-term power-on of the water level probe 102, extending the service life of the water level probe 102, and thus improving the reliability of the product.

[0058] In addition, compared to Figure 2 The water level detection circuit 20 shown, Figure 3 The water level detection circuit 30 shown only needs to be provided with one first isolation unit 1031 and one second isolation unit 1032 , thereby greatly saving the extra cost caused by providing too many isolation units.

[0059] It can be understood that the control module 104 can control the corresponding switch unit 1033 to be turned on through a signal output terminal B, thereby sending a detection signal to each signal receiving probe 1022 in turn, and judging whether the water in the water tank 101 at this time submerges the corresponding water level receiving probe 1022 according to the water level signal fed back by the signal sending probe 1021, so as to detect the water level of the water tank 101.

[0060] The switch unit 1033 is a transistor. The input terminal D1 of the switch unit 1033 is the source of the transistor, the output terminal D2 of the switch unit 1033 is the drain of the transistor, and the control terminal D3 of the switch unit 1033 is the gate of the transistor. Specifically, the transistor can be a low-temperature polysilicon thin film transistor, an oxide semiconductor thin film transistor, or an amorphous silicon thin film transistor.

[0061] The type of low-temperature polysilicon thin film transistor, oxide semiconductor thin film transistor and amorphous silicon thin film transistor can be an N-type transistor or a P-type transistor. When the transistor is an N-type transistor, the gate of the transistor is at a high level, and the source and drain of the transistor are turned on. When the transistor is an N-type transistor, the gate of the transistor is at a low level, and the source and drain of the transistor are disconnected. When the transistor is a P-type transistor, the gate of the transistor is at a high level, and the source and drain of the transistor are disconnected. When the transistor is a P-type transistor, the gate of the transistor is at a low level, and the source and drain of the transistor are turned on.

[0062] exist Figure 2 The water level detection circuit 20 shown or Figure 3 In the water level detection circuit 30 shown, the first isolation unit 1031 may be a photoelectric isolator, a transformer isolator, a capacitor isolator or a magnetic isolator; and / or, the second isolation unit 1032 may be a photoelectric isolator, a transformer isolator, a capacitor isolator or a magnetic isolator.

[0063] Among them, the photoelectric isolator uses photoelectric isolation to achieve circuit isolation, and it uses optical elements to achieve signal isolation between the input and output ends. Specifically, at the input end, the input signal drives the light-emitting diode after being processed by the circuit, and then the optical signal emitted by the light-emitting diode is converted into a light beam through the optical element. At the output end, the light beam is irradiated onto the photodiode to generate a corresponding electrical signal.

[0064] Optoelectronic isolators use optical isolation to achieve electrical isolation between the input and output ends. This method has fast response, wide isolation bandwidth and good safety performance, and is often used in industrial automation, medical equipment and communication systems.

[0065] Among them, the transformer isolator uses transformer isolation to achieve circuit isolation, which uses a transformer to achieve electrical isolation between the input and output ends. Specifically, at the input end, the input signal drives the input coil after being processed by the circuit. The transformer consists of an input coil and an output coil, and there is no direct electrical connection between the two coils. At the output end, the magnetic field generated by the input coil in the transformer induces the electrical signal on the output coil.

[0066] Transformer isolators use the principle of electromagnetic induction to achieve electrical isolation between the input and output ends. This method is simple, reliable, and has a wide range of applications. It is commonly used in power systems, measuring instruments, audio equipment, and other fields.

[0067] Among them, the capacitive isolator uses capacitive isolation to achieve circuit isolation, which uses capacitors to achieve electrical isolation between the input and output ends. Specifically, at the input end, the input signal drives the input capacitor after being processed by the circuit. The capacitor, as an isolation element, has dielectric isolation between two electrodes. At the output end, the output signal passes through the electric field effect of the output capacitor, thereby achieving electrical isolation between the input and output ends.

[0068] Capacitor isolators use the electric field effect to achieve electrical isolation between the input and output ends. This method has the characteristics of fast response speed and low cost, and is commonly used in fields such as analog signal isolation and sensor interface.

[0069] Among them, the magnetic isolator uses magnetic isolation to achieve circuit isolation, which uses magnetic materials to achieve electrical isolation between the input and output ends. Specifically, at the input end, the input signal drives the input coil after being processed by the circuit. The magnetic material is usually composed of ferrite or soft magnetic material, which has high magnetic permeability and magnetic permeability. At the output end, the output signal generates a corresponding electrical signal in the output coil through the induction of the magnetic field.

[0070] Magnetic isolators use the principle of magnetic field induction to achieve electrical isolation between the input and output ends. This method has good isolation effect and a wide frequency response range, and is commonly used in power systems, computer networks, audio equipment and other fields.

[0071] exist Figure 2 The water level detection circuit 20 shown or Figure 3 In the water level detection circuit 30 shown, the first isolation unit 1031 is used to electrically isolate the signal sending probe 1021 from the control module 104. That is, the first isolation unit 1031 makes it possible to prevent the control module 104 from having an actual electrical connection with the signal sending probe 1021, thereby avoiding electrolytic oxidation caused by long-term power-on of the signal sending probe 1021, extending the service life of the signal sending probe 1021, and thus improving the reliability of the product.

[0072] exist Figure 2 The water level detection circuit 20 shown or Figure 3 In the water level detection circuit 30 shown, the second isolation unit 1032 is used to electrically isolate the signal receiving probe 1022 from the control module 104. That is, the second isolation unit 1032 makes it possible to prevent the control module 104 from having an actual electrical connection with the signal receiving probe 1022, thereby avoiding electrolytic oxidation caused by long-term power-on of the signal receiving probe 1022, extending the service life of the signal receiving probe 1022, and thus improving the reliability of the product.

[0073] In some embodiments, see Figure 4 , Figure 4 This is a schematic diagram of the structure of the control module in the water level detection circuit provided in the embodiment of the present application. Figure 4 As shown, the control module 103 includes a signal generating unit 1031 and a signal detecting unit 1032. The signal generating unit 1031 is used to generate a detection signal. The signal detecting unit 1032 is used to detect a water level signal.

[0074] Specifically, the control module 103 may include a processor, which may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0075] Optionally, in some embodiments of the present application, please refer to Figure 5 , Figure 5 This is a schematic diagram of the structure of the isolation module in the water level detection circuit provided in the embodiment of the present application. Figure 5 As shown, the isolation module 103 includes a first isolation unit 103A, a second isolation unit 103B and a control unit 103C. The first isolation unit 103A is used to electrically isolate the water level probe 102 from the control module 104. The second isolation unit 103B is used to electrically isolate the water level probe 102 from the control module 104. The control unit 103C is used to control the first isolation unit 103A and the second isolation unit 103B to work alternately.

[0076] It is understandable that the embodiment of the present application can avoid excessive wear of the isolation module 103 due to long-term use by setting two isolation units to work alternately, thereby further improving the reliability of the product.

[0077] The detailed structures of the first isolation unit 103A and the second isolation unit 103B can be referred to. Figure 1 The introduction of the water level detection circuit 10 shown is not repeated here.

[0078] The control unit 103C may be a transistor, and the details may refer to the above description of the transistor, which will not be elaborated here.

[0079] See also Figure 6 , Figure 6It should be noted that the water level detection method provided in the embodiment of the present application is used for the water level detection circuit described in any of the above embodiments, and the specific content of the water level detection circuit can be referred to above, which will not be repeated here.

[0080] like Figure 6 As shown, the water level detection method provided in the embodiment of the present application includes the following steps:

[0081] Step S601: the control module sends a detection signal to a signal receiving pin through the isolation module.

[0082] In step S601, the control module generates and sends a detection signal, which is transmitted to the signal receiving probe through the isolation module. The function of the isolation module is to ensure electrical isolation of the signal during transmission, thereby protecting the control module and the signal receiving probe from electrical interference or damage.

[0083] Step S602: the signal sending needle feeds back the water level signal to the control module through the isolation module.

[0084] In step S602, after the signal receiving probe receives the detection signal, the signal sending probe generates a water level signal according to the water level (whether the water level submerges the probe), and feeds the water level signal back to the control module through the isolation module. This step also uses the isolation module to ensure the safety of signal transmission.

[0085] Step S603: the control module detects the water level of the water storage tank according to the water level signal.

[0086] In step S603, after receiving the water level signal fed back by the signal sending probe, the control module determines the actual water level in the water storage tank according to the signal. The logic or algorithm inside the control module will analyze the signal and control the working state of related equipment accordingly, such as starting or stopping the water pump to maintain the required water level.

[0087] It should be noted that in the water level detection method provided in the embodiment of the present application, the transmission of signals must pass through the isolation module, and the function of the isolation module is mainly to electrically isolate the control module from the water level probe.

[0088] In the water level detection method provided in the embodiment of the present application, a water level detection circuit is formed by setting a signal sending probe, at least one signal receiving probe, a control module and an isolation module. Among them, the control module sends a detection signal to the signal receiving probe, and receives the water level signal fed back by the signal sending probe to detect the water level of the water storage tank. The isolation module electrically isolates the signal receiving probe from the control module, and the isolation module electrically isolates the signal sending probe from the control module; that is, the isolation module makes there is no actual electrical connection between the control module and the water level probe, so as to avoid electrolytic oxidation caused by long-term power-on of the water level probe, extend the service life of the water level probe, and thus improve the reliability of the product.

[0089] It should be noted that the above description of the implementation manner and beneficial effects of the water level detection circuit is also applicable to the water level detection method of this embodiment.

[0090] See also Figure 7 , Figure 7 Schematic diagram of an electrical appliance provided in an embodiment of the present application. The embodiment of the present application also provides an electrical appliance 70. The electrical appliance 70 provided in the embodiment of the present application includes a water level detection circuit. The water level detection circuit is as described in any of the above embodiments.

[0091] Specifically, the water level detection circuit can be set in an electrical appliance, and the household appliance can include but is not limited to a water purifier, a water dispenser, a water boiler, etc., which is not limited here.

[0092] The electrical appliance 70 provided in the embodiment of the present application forms a water level detection circuit by providing a signal sending probe, at least one signal receiving probe, a control module and an isolation module. Among them, the control module sends a detection signal to the signal receiving probe, and receives the water level signal fed back by the signal sending probe to detect the water level of the water storage tank. The isolation module electrically isolates the signal receiving probe from the control module, and the isolation module electrically isolates the signal sending probe from the control module; that is, the isolation module makes there is no actual electrical connection between the control module and the water level probe, so as to avoid electrolytic oxidation caused by long-term power-on of the water level probe, extend the service life of the water level probe, and thus improve the reliability of the product.

[0093] It should be noted that the above description of the implementation method and beneficial effects of the water level detection circuit is also applicable to the electrical appliance of this implementation method.

[0094] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0095] In addition, each functional module in each embodiment of the present application may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.

[0096] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" 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 representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0097] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. The scope of the present application is defined by the claims and their equivalents. Ordinary technicians in this field may change, modify, replace and modify the above implementation methods within the scope of the present application.

[0098] The above disclosure is only the preferred embodiment of the present application, which certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A water level detection circuit, characterized in that: include: Water storage tanks; A water level probe, which is disposed in the water storage tank and includes a signal sending probe and at least one signal receiving probe; A control module, the control module is used to send a detection signal to the signal receiving probe, and receive a water level signal fed back by the signal sending probe, so as to detect the water level of the water storage tank; as well as An isolation module, the water level probe is connected to the control module through the isolation module, and the isolation module is used to electrically isolate the water level probe from the control module.

2. The water level detection circuit according to claim 1, characterized in that: The control module is provided with a signal input terminal and at least one signal output terminal; The isolation module includes a first isolation unit and at least one second isolation unit; The signal input end is connected to one end of the first isolation unit, and the other end of the first isolation unit is connected to the signal sending probe; A signal output end is connected to one end of a corresponding second isolation unit, and the other end of a corresponding second isolation unit is connected to a corresponding signal receiving probe.

3. The water level detection circuit according to claim 1, characterized in that: The control module is provided with a signal input terminal, a signal output terminal and at least one control signal terminal; The isolation module comprises a first isolation unit, a second isolation unit and at least one switch unit, wherein the switch unit is provided with an input end, an output end and a control end; The signal input end is connected to one end of the first isolation unit, and the other end of the first isolation unit is connected to the signal sending probe; The signal output end is connected to one end of the second isolation unit, the other end of the second isolation unit is connected to the input ends of all the switch units, the output end of one of the switch units is connected to the corresponding signal receiving probe, and the control end of one of the switch units is connected to the corresponding control signal end.

4. The water level detection circuit according to claim 2 or 3, characterized in that: The first isolation unit is a photoelectric isolator, a transformer isolator, a capacitor isolator or a magnetic isolator; and / or The second isolation unit is a photoelectric isolator, a transformer isolator, a capacitor isolator or a magnetic isolator.

5. The water level detection circuit according to claim 2 or 3, characterized in that: The first isolation unit is used to electrically isolate the signal sending probe from the control module; the second isolation unit is used to electrically isolate the signal receiving probe from the control module.

6. The water level detection circuit according to claim 3, characterized in that: The switch unit is a low-temperature polysilicon thin film transistor, an oxide semiconductor thin film transistor or an amorphous silicon thin film transistor.

7. The water level detection circuit according to claim 1, characterized in that: The control module includes a signal generating unit and a signal detecting unit; The signal generating unit is used to generate the detection signal; the signal detecting unit is used to detect the water level signal.

8. The water level detection circuit according to claim 1, characterized in that: The isolation module includes a first isolation unit, a second isolation unit and a control unit; The first isolation unit is used to electrically isolate the water level probe from the control module; the second isolation unit is used to electrically isolate the water level probe from the control module; The control unit is used to control the first isolation unit and the second isolation unit to work alternately.

9. A water level detection method, used in the water level detection circuit according to any one of claims 1 to 8, characterized in that: The water level detection method comprises: The control module sends a detection signal to the signal receiving pin through the isolation module; The signal sending needle feeds back the water level signal to the control module through the isolation module; and The control module detects the water level of the water storage tank according to the water level signal.

10. An electrical appliance, characterized in that: The water level detection circuit comprises the water level detection circuit as described in any one of claims 1 to 8.

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