Dry burning prevention control circuit, electric water heater and dry burning prevention control method

Abstract

The invention relates to an anti-dry-burning control circuit, an electric water heater and an anti-dry-burning control method. The anti-dry-burning control circuit comprises a power supply module; the first switch unit is connected with the power supply module, and the first switch unit is used for controlling the on-off of a heating element; the detection module comprises a second switch unit, a first detection end and a second detection end, and the first detection end is connected with the second switch unit in series and then is connected with the power supply module; and the controller is respectively connected with the power supply module, the control end of the first switch unit, the control end of the second switch unit and the second detection end. When the electric water heater works, the first detection end and the second detection end form a loop through water flow, and the controller can detect corresponding electric signals to control the heating element to start heating, so that dry burning of the electric water heater is effectively avoided, and energy consumption is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to an anti-dry-burn control circuit, an electric water heater, and an anti-dry-burn control method. Background Art

[0002] As people's living standards improve, the demand for household water heaters is also growing. Existing electric water heaters generally have a dry-boil prevention function. This feature uses a water level monitoring device to monitor the water level in the inner tank in real time. The heating element activates only when the tank is full, improving user safety. However, this real-time monitoring of the water level in the inner tank increases energy consumption. Summary of the Invention

[0003] Based on this, it is necessary to provide an anti-dry-burning control circuit, an electric water heater and an anti-dry-burning control method to address the above technical problems.

[0004] In the first aspect, the present application proposes an anti-dry-burning control circuit, which includes: a power supply module; a first switch unit, connected to the power supply module, and the first switch unit is used to control the on and off of the heating element; a detection module, the detection module includes a second switch unit, a first detection end and a second detection end, the first detection end is connected in series with the second switch unit and then connected to the power supply module; a controller, respectively connected to the power supply module, the control end of the first switch unit, the control end of the second switch unit, and the second detection end.

[0005] In the above-mentioned anti-dry-burning control circuit, the controller can disconnect the power supply of the detection module through the second switch unit, thereby reducing energy consumption.

[0006] In one embodiment, the detection module further includes a third switch unit, the second detection end is connected in series with the third switch unit and then connected to the controller, and the control end of the third switch unit is connected to the controller.

[0007] In one embodiment, the first switch unit is a relay; and / or the second switch unit is a relay; and / or the third switch unit is a relay.

[0008] In one embodiment, the power module includes a rectifier and buck unit, an input end of the rectifier and buck unit is connected to the mains, and an output end of the rectifier and buck unit is connected to the first switch unit, the second switch unit, and the controller.

[0009] In one embodiment, the rectifier and step-down unit includes: a transformer and a rectifier bridge, the input end of the transformer is connected to the mains, the output end of the transformer is connected to the input end of the rectifier bridge, and the output end of the rectifier bridge is connected to the first switch unit, the second switch unit, and the controller.

[0010] In one embodiment, the rectifier and buck unit further includes: a voltage regulator, wherein an input end of the voltage regulator is connected to the rectifier bridge, and an output end of the voltage regulator is connected to the second switch unit and the controller.

[0011] In one embodiment, the voltage regulator uses a voltage regulator chip model LM7805.

[0012] In the second aspect, the present application proposes an electric water heater, comprising an inner tank and the anti-dry-burning control circuit described in the embodiment of the first aspect above, the inner tank is provided with a magnesium rod, a water outlet pipe and an electric heating tube, the first switch unit is connected to the electric heating tube, and the first switch unit is used to control the on and off of the electric heating tube; the first detection end is electrically connected to the magnesium rod, and the second detection end is arranged on the water outlet pipe, and the second detection end is used to contact the water in the water outlet pipe.

[0013] The above-mentioned electric water heater connects the first detection terminal of the anti-dry-burn control circuit to the magnesium rod, and the second detection terminal to the water outlet pipe. This eliminates the need to drill a hole in the inner tank to detect the water level, thereby reducing the risk of leakage. Upon detecting that the inner tank is full of water, the controller can disconnect the power supply of the detection module via the second switch unit, thereby reducing energy consumption. Furthermore, upon detecting that the inner tank is full of water, for example, during the heating process, the controller promptly disconnects the voltage applied to the magnesium rod via the second switch unit, effectively preventing the magnesium rod from being consumed at an accelerated rate and resulting in a shortened lifespan.

[0014] In a third aspect, the present application proposes a dry-burn prevention control method, which is applied to the dry-burn prevention control circuit described in the first aspect of the embodiment. The method includes:

[0015] When powered on, the first switch unit is controlled to be disconnected, and the second switch unit and the third switch unit are controlled to be closed; when heating is started, if it is detected that the duration of the conductive signal between the first detection end and the second detection end exceeds the preset time length, the first switch unit is controlled to be closed and the heating element starts heating.

[0016] In one embodiment, if it is detected that the duration of the conductive signal between the first detection end and the second detection end exceeds a preset time length, the first switch unit is controlled to be closed, and the heating element starts the heating step. The method also includes: controlling the second switch unit to be disconnected from the third switch unit.

[0017] The above-mentioned dry-boil prevention control method detects the water level via the first and second detection terminals. When the inner tank is detected to be full of water, the controller controls the heating element via the first switch unit to start heating, thereby achieving the dry-boil prevention effect. After detecting that the inner tank is full of water, for example, during the heating process, the controller can disconnect the power supply of the detection module via the second switch unit, thereby reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. 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 creative work.

[0019] Figure 1 A module diagram of an anti-dry-burn control circuit in one embodiment;

[0020] Figure 2 A module diagram of an anti-dry-burning control circuit in another embodiment;

[0021] Figure 3 A module diagram of an anti-dry-burning control circuit in yet another embodiment;

[0022] Figure 4 is a circuit diagram of a rectifier and voltage-reducing unit in one embodiment;

[0023] Figure 5 A circuit diagram of an anti-dry-burn control circuit in one embodiment;

[0024] Figure 6 is a schematic diagram of an electric water heater in one embodiment;

[0025] Figure 7 Flowchart of a method for preventing dry burning in one embodiment;

[0026] Figure 8 Flowchart of a method for preventing dry burning in another embodiment;

[0027] Description of reference numerals:

[0028] Power supply module 110, first switch unit 120, detection module 130, controller 140, second switch unit 131, first detection end 132, second detection end 133, third switch unit 134, rectifier and step-down unit 111, inner tank 200, anti-dry burning control circuit 100, magnesium rod 210, water outlet pipe 220, water inlet pipe 230. DETAILED DESCRIPTION

[0029] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0031] It will be understood that the terms "first," "second," etc. used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element.

[0032] Spatially relative terms such as "below," "beneath," "beneath," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that in addition to the orientations shown in the figures, spatially relative terms also include different orientations of the device in use and operation. For example, if the device in the drawings is turned over, an element or feature described as "below" or "beneath" or "beneath" the other elements will be oriented "above" the other elements or features. Thus, the exemplary terms "below" and "below" can include both the above and below orientations. In addition, the device can also include alternative orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are to be interpreted accordingly.

[0033] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intervening element. In addition, the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc., if there is transmission of electrical signals or data between the connected objects.

[0034] As used herein, the singular forms "a," "an," and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include," "comprising," "having," and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Furthermore, the term "and / or" as used in this specification includes any and all combinations of the relevant listed items.

[0035] In one embodiment, Figure 1 As shown, an anti-dry burning control circuit is provided, including: a power module 110, a first switch unit 120, a detection module 130 and a controller 140, the first switch unit 120 is connected to the power module 110, and the first switch unit 120 is used to control the on and off of the heating element; the detection module 130 includes a second switch unit 131, a first detection end 132 and a second detection end 133, the first detection end 132 is connected in series with the second switch unit 131 and then connected to the power module 110; the controller 140 is respectively connected to the power module 110, the control end of the first switch unit 120, the control end of the second switch unit 131, and the second detection end 133.

[0036] Specifically, the power module 110 is used to supply power to the entire anti-dry-burn control circuit. The power module 110 can output DC voltages of different sizes, for example, +5V DC voltage, +12V DC voltage, etc. The first switch unit 120, the detection module 130, and the controller 140 can obtain voltages of corresponding sizes according to their own needs. The first switch unit 120 is respectively connected to the power module 110, the heating element, and the controller 140. The control end of the first switch unit 120 is used to receive the heating signal from the controller 140. The first switch unit 120 is used to generate on-off according to the heating signal, thereby controlling the on-off of the heating element. For example, the heating element is respectively connected to the mains and the first switch unit 120. When the first switch unit 120 is closed, the heating element starts heating; when the first switch unit 120 is disconnected, the heating element stops heating.

[0037] It is understood that the aforementioned anti-dry-boil control circuit has two flexible detection terminals (a first detection terminal 132 and a second detection terminal 133) that can be installed according to actual needs. For example, when the aforementioned anti-dry-boil control circuit is applied to an electric water heater, the first detection terminal 132 and the second detection terminal 133 can be simultaneously installed on the inner tank 200. When the water level in the inner tank 200 exceeds both the first detection terminal 132 and the second detection terminal 133, a circuit is formed between the first detection terminal 132 and the second detection terminal 133, and the controller 140 receives a full water signal. The controller 140 then controls the heating element to start heating via the first switch unit 120. When the water level in the inner tank 200 does not simultaneously exceed both the first detection terminal 132 and the second detection terminal 133, the circuit is disconnected, the controller 140 does not receive a full water signal, and the heating element does not start heating, thereby achieving the anti-dry-boil effect.

[0038] In other embodiments, the first detection end 132 can also be installed on the inner tank 200, and the second detection end 133 can be installed on the water outlet pipe 220; in addition, the first detection end 132 can also be installed on the magnesium rod 210, and the second detection end 133 can be installed on the water outlet pipe 220.

[0039] After detecting that the inner pot 200 is full of water, for example, during the heating process, the controller 140 can disconnect the power supply of the detection module 130 through the second switch unit 131, thereby reducing energy consumption.

[0040] The following is a specific example of an anti-dry-burn control circuit of the present application being applied to an electric water heater. The first detection terminal 132 of the detection module 130 is electrically connected to the magnesium rod 210, and the second detection terminal 133 is disposed on the water outlet pipe 220. The second detection terminal 133 is configured to contact the water in the water outlet pipe 220. The first detection terminal 132 is connected in series with the second switch unit 131 to the power module 110 for receiving the voltage signal output by the power module 110.

[0041] In one embodiment, when the water level in the inner tank 200 needs to be detected, the controller 140 sends a switching signal to the control terminal of the second switch unit 131, causing the second switch unit 131 to close and conduct. If the water level in the inner tank 200 exceeds the water outlet pipe 220, water flows through the upper end of the water outlet pipe 220 to the second detection terminal 133. At this time, the first detection terminal 132 and the second detection terminal 133 form a loop through the water flow. If the first detection terminal 132 receives the voltage signal output by the power module 110, the controller 140 will receive a high-level voltage signal. When the controller 140 receives a high-level voltage signal, it means that the water level in the inner tank 200 meets the heating requirements. At this time, the controller 140 controls the first switch unit 120 to close, the heating element is powered on and starts heating, thereby heating the water stored in the inner tank 200; correspondingly, if the controller 140 does not receive a high-level voltage signal, it means that the first detection end 132 and the second detection end 133 do not form a loop through the water flow. At this time, the water storage in the inner tank 200 is insufficient and the heating element does not start heating.

[0042] It is understandable that after detecting that the inner tank 200 is full of water, for example during the heating process, the controller 140 promptly disconnects the voltage applied to the magnesium rod 210 through the second switch unit 131, which can effectively avoid the accelerated consumption of the magnesium rod 210 and the resulting reduction in lifespan.

[0043] In one embodiment, Figure 2As shown, the detection module 130 further includes a third switch unit 134. The second detection terminal 133 is connected in series with the third switch unit 134 and then connected to the controller 140. The control terminal of the third switch unit 134 is also connected to the controller 140. Specifically, the controller 140 can send a switch signal to the control terminal of the third switch unit 134. The third switch unit 134 can interrupt or conduct according to the switch signal, thereby controlling the connection between the second detection terminal 133 and the controller 140, thereby adjusting whether the controller 140 can receive the voltage signal. It will be understood that in this embodiment, the controller 140 sends a switch signal to the second switch unit 131 and the third switch unit 134 simultaneously through a signal output port. The second switch unit 131 and the third switch unit 134 are then interrupted or conducted simultaneously. This configuration can cut off the connection between the controller 140 and the first detection terminal 132 and the second detection terminal 133, respectively, effectively preventing damage to the controller 140 in the event of a leakage in the heating element. In some other embodiments, the controller 140 may send switching signals to the second switch unit 131 and the third switch unit 134 respectively through two signal output ports.

[0044] In one embodiment, the first switch unit 120 is a relay; and / or the second switch unit 131 is a relay; and / or the third switch unit 134 is a relay. Specifically, in this embodiment, at least one of the first switch unit 120, the second switch unit 131, and the third switch unit 134 can be a relay. For example, the first switch unit 120 is a relay, and the second switch unit 131 and the third switch unit 134 are switching transistors. For another example, the first switch unit 120 and the second switch unit 131 are relays, and the third switch unit 134 is a switching transistor. The switching transistor can be a transistor or an optocoupler, and the selection can be made based on the specific design.

[0045] In one embodiment, Figure 3 As shown, the power module 110 includes a rectifier and buck unit 111. The input end of the rectifier and buck unit 111 is connected to the mains electricity, and the output end of the rectifier and buck unit 111 is connected to the first switch unit 120, the second switch unit 131, and the controller 140. Specifically, the rectifier and buck unit 111 is used to rectify and buck the input AC voltage, thereby outputting a variety of DC voltages of different magnitudes, such as a +5V DC voltage and a +12V DC voltage, to provide different voltages to the first switch unit 120, the detection module 130, and the controller 140. In some other embodiments, the power module 110 may not be provided with the rectifier and buck unit 111, and the corresponding DC voltage may be output by a battery.

[0046] In one embodiment, Figure 4As shown, the rectifier and step-down unit 111 includes: a transformer T1 and a rectifier bridge B1, the input end of the transformer T1 is connected to the mains, the output end of the transformer T1 is connected to the input end of the rectifier bridge B1, and the output end of the rectifier bridge B1 is connected to the first switch unit 120, the second switch unit 131, and the controller 140.

[0047] Specifically, the input end of transformer T1 is connected to the mains and is used to receive an AC voltage. Transformer T1 can step down the input AC voltage. The stepped-down AC voltage is transmitted from the output end of transformer T1 to the input end of rectifier bridge B1. Rectifier bridge B1 is used to rectify the stepped-down AC voltage into a DC voltage. The output end of rectifier bridge B1 is respectively connected to the first switch unit 120, the second switch unit 131, and the controller 140 to output a first DC voltage thereto. In some embodiments, the first DC voltage can be a +12V DC voltage, and the first switch unit 120, the second switch unit 131, and the controller 140 can operate under the action of the +12V DC voltage.

[0048] In one embodiment, Figure 4 As shown, the rectifier and step-down unit 111 also includes: a voltage regulator U1, the input end of the voltage regulator U1 is connected to the rectifier bridge B1, and the output end of the voltage regulator U1 is connected to the second switch unit 131 and the controller 140. Specifically, after receiving the DC voltage at the input end of the voltage regulator U1, it is then stepped down and the stepped-down DC voltage is finally output from the output end of the voltage regulator U1. The output end of the voltage regulator U1 is respectively connected to the second switch unit 131 and the controller 140 for outputting the second DC voltage thereto. In some embodiments, the voltage regulator U1 uses a voltage regulator chip model LM7805. In some embodiments, the second DC voltage is a +5V DC voltage, and the second switch unit 131 and the controller 140 can operate under the action of the +5V DC voltage.

[0049] In one embodiment, Figure 4 As shown, the rectifier and voltage-reducing unit 111 further includes a capacitor C1, one end of which is connected to the output end of the rectifier bridge B1, and the other end of which is grounded. By providing the capacitor C1, clutter can be filtered out to make the current more stable.

[0050] The following describes the anti-dry burning control circuit of the present application in detail with a specific embodiment. In this embodiment, the first switch unit 120 includes a first relay J1, the second switch unit 131 includes a second relay J2, and the third switch unit 134 includes a third relay J3. Figure 5As shown, the input terminals of transformer T1 are connected to the neutral and live wires, respectively, and receive AC voltage. Transformer T1 steps down the AC voltage and outputs it to rectifier bridge B1. After rectification by rectifier bridge B1, a 12V DC voltage is generated, which is then stepped down by voltage regulator U1 to a 5V DC voltage. The 5V DC voltage is used to power the power supply terminal (pin 1) of controller 140 and output a 5V voltage signal to the contact group of the second relay J2. The 12V DC voltage is connected to the coil groups of the first relay J1, the second relay J2, and the third relay J3. The switching signal output terminal (pin 3) of controller 140 is connected to the coil groups of the second relay J2 and the third relay J3, respectively, and is used to control the switching of these two relays. The heating signal output terminal (pin 2) of controller 140 is connected to the coil group of the first relay J1, and is used to control the switching of the first relay J1. When the water level in the inner tank 200 of the electric water heater exceeds the water outlet pipe 220, the water will flow through the upper end of the water outlet pipe 220 to the second detection end 133. At this time, the first detection end 132 and the second detection end 133 form a loop through the water flow. When the second relay J2 and the third relay J3 are turned on, the signal input end (pin 4) of the controller 140 will receive a high-level voltage signal. After the controller 140 receives the high-level voltage signal, it means that the water level in the inner tank 200 meets the heating requirements. At this time, the controller 140 controls the first relay J1 to close, and the heating element starts to work to heat the water stored in the inner tank 200. In one embodiment, as Figure 6 As shown, the present application also proposes an electric water heater, including an inner tank 200 and the anti-dry burning control circuit 100 in the above embodiment, the inner tank 200 is provided with a magnesium rod 210, a water outlet pipe 220 and an electric heating pipe (not shown in the figure), the first switch unit 120 is connected to the electric heating pipe, and the first switch unit 120 is used to control the on and off of the electric heating pipe; the first detection end 132 is electrically connected to the magnesium rod 210, and the second detection end 133 is arranged on the water outlet pipe 220, and the second detection end 133 is used to contact the water in the water outlet pipe 220.

[0051] Specifically, the magnesium rod 210 is used to protect the inner tank 200 and the electric heating tube in the electric water heater, while softening the water quality and preventing excessive scale, thereby extending the service life of the electric water heater. In some embodiments, the magnesium rod 210 can be a resistance magnesium rod 210 to prevent the magnesium rod 210 from being consumed quickly. The second detection end 133 is arranged at the lower end opening of the water outlet pipe 220, that is, at the water outlet; in one embodiment, the second detection end 133 is insulated and installed on the water outlet pipe 220. The electric heating tube is used to heat the stored water in the inner tank 200. It can be understood that the electric water heater also includes: a water inlet pipe 230, which is used to inject water into the inner tank 200.

[0052] The electric water heater in this embodiment connects the first detection end 132 in the detection module 130 to the magnesium rod 210, and sets the second detection end 133 in the water outlet pipe 220. This eliminates the need to drill a hole in the inner tank 200 to detect the water level, thereby reducing the risk of water leakage in the inner tank 200. When the water level in the inner tank 200 exceeds the water outlet pipe 220, the water will flow through the upper end of the water outlet pipe 220 to the second detection end 133. At this time, the magnesium rod 210 and the second detection end 133 form a loop through the water flow. When there is an input voltage at the first detection end 132, the signal input end of the controller 140 will detect a high-level voltage signal, and in this case, the first switch unit 120 will be controlled to conduct, and the electric heating tube will begin to heat.

[0053] Among them, after detecting that the inner tank 200 is full of water, the controller 140 can disconnect the power supply of the detection module 130 through the second switch unit 131, thereby reducing energy consumption; at the same time, after detecting that the inner tank 200 is full of water, for example, during the heating process, the controller 140 promptly disconnects the voltage applied to the magnesium rod 210 through the second switch unit 131, which can effectively avoid the accelerated consumption of the magnesium rod 210 and the resulting reduction in lifespan.

[0054] In one embodiment, Figure 7 As shown, the present application also proposes an anti-dry-burn control method, which is applied to the anti-dry-burn control circuit 100 in the above embodiment. The anti-dry-burn control method can be executed by the controller 140 in the anti-dry-burn control circuit 100. The anti-dry-burn control method includes but is not limited to the following steps:

[0055] Step S310 , when the power is turned on, the first switch unit is controlled to be opened, and the second switch unit and the third switch unit are controlled to be closed.

[0056] Specifically, when the electric water heater is powered on, the controller 140 controls the first switch unit 120 to open, thereby preventing the heating element from heating immediately after power-on. Simultaneously, to detect the amount of water in the electric water heater tank 200, the controller 140 controls the second switch unit 131 and the third switch unit 134 to close, thereby allowing the signal input terminal of the controller 140 to normally receive a voltage signal. Specifically, if the first switch unit 120 includes a first relay J1, the second switch unit 131 includes a second relay J2, and the third switch unit 134 includes a third relay J3, then after power-on, the controller 140 controls the first relay J1 to open, and the second and third relays J2 and J3 to close.

[0057] Step S320 , when starting heating, if it is detected that the duration of the conductive signal between the first detection end and the second detection end exceeds a preset time, the first switch unit is controlled to close, and the heating element starts heating.

[0058] Specifically, if the controller 140 detects that the signal (i.e., a high-level voltage signal) between the first detection terminal 132 and the second detection terminal 133 is continuous for a duration exceeding a preset time (e.g., 10 seconds), it indicates that the water level in the inner tank 200 is full. Therefore, the controller 140 controls the first switch unit 120 to close, thereby causing the heating element to begin heating. Specifically, if the first switch unit 120 includes a first relay J1, the controller 140 controls the first relay J1 to close, causing the electric heating element to begin heating.

[0059] In one embodiment, Figure 8 As shown, in step S320, if it is detected that the duration of the conductive signal between the first detection terminal 132 and the second detection terminal 133 exceeds the preset time length, then the first switch unit 120 is controlled to be closed, and the heating element starts heating. After that, the anti-dry-burn control method further includes:

[0060] Step S330 , controlling the second switch unit 120 and the third switch unit 131 to be disconnected.

[0061] It is understood that the controller 140 promptly disconnects the voltage applied to the magnesium rod 210 through the second switch unit 131, effectively preventing the accelerated consumption of the magnesium rod 210 and the resulting reduction in its lifespan. Simultaneously, the second switch unit 131 and the third switch unit 134 are synchronously disconnected. This arrangement disconnects the controller 140 from the first detection terminal 132 and the second detection terminal 133, effectively preventing damage to the controller 140 in the event of a leakage in the electric water heater.

[0062] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0063] In the description of this specification, reference to the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0064] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the above-mentioned embodiments. In particular, any reference to memory, database, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processors involved in the various embodiments provided herein may be, but are not limited to, general-purpose processors, central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), programmable logic devices (PLDs), data processing logic devices based on quantum computing, and the like.

[0065] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. An anti-dry burning control circuit, characterized in that: The anti-dry burning control circuit (100) comprises: Power module (110); A first switch unit (120) connected to the power module (110), the first switch unit (120) being used to control the on and off of the heating element; A detection module (130), the detection module (130) comprising a second switch unit (131), a first detection terminal (132), and a second detection terminal (133), wherein the first detection terminal (132) is connected in series with the second switch unit (131) and then connected to the power module (110); The controller (140) is respectively connected to the power module (110), the control end of the first switch unit (120), the control end of the second switch unit (131), and the second detection end (133).

2. The anti-dry burning control circuit according to claim 1, characterized in that: The detection module (130) further includes a third switch unit (134), the second detection end (133) is connected in series with the third switch unit (134) and then connected to the controller (140), and the control end of the third switch unit (134) is connected to the controller (140).

3. The anti-dry burning control circuit according to claim 2, characterized in that: The first switch unit (120) adopts a relay; and / or The second switch unit (131) adopts a relay; and / or The third switch unit (134) adopts a relay.

4. The anti-dry burning control circuit according to claim 1, characterized in that: The power module (110) comprises a rectifier and buck unit (111), an input end of the rectifier and buck unit (111) is connected to the mains, and an output end of the rectifier and buck unit (111) is connected to the first switch unit (120), the second switch unit (131), and the controller (140).

5. The anti-dry burning control circuit according to claim 4, characterized in that: The rectifier and voltage-reducing unit (111) comprises: a transformer (T1) and a rectifier bridge (B1); the input end of the transformer (T1) is connected to the mains; the output end of the transformer (T1) is connected to the input end of the rectifier bridge (B1); and the output end of the rectifier bridge (B1) is connected to the first switch unit (120), the second switch unit (131), and the controller (140).

6. The anti-dry burning control circuit according to claim 5, characterized in that: The rectifier and voltage-reducing unit (111) further includes a voltage stabilizer (U1), wherein an input end of the voltage stabilizer (U1) is connected to the rectifier bridge (B1), and an output end of the voltage stabilizer (U1) is connected to the second switch unit (131) and the controller (140).

7. The anti-dry burning control circuit according to claim 6, characterized in that: The voltage regulator (U1) uses a voltage regulator chip model LM7805.

8. An electric water heater, characterized in that: The invention comprises an inner pot (200) and an anti-dry burning control circuit (100) according to any one of claims 1 to 7, wherein the inner pot (200) is provided with a magnesium rod (210), a water outlet pipe (220) and an electric heating pipe, the first switch unit (120) is connected to the electric heating pipe, and the first switch unit (120) is used to control the on and off of the electric heating pipe; the first detection end (132) is electrically connected to the magnesium rod (210), the second detection end (133) is provided on the water outlet pipe (220), and the second detection end (133) is used to contact water in the water outlet pipe (220).

9. A dry burning prevention control method, characterized in that: The method applied to the anti-dry-burn control circuit (100) according to any one of claims 2 to 7 comprises: In the case of power-on startup, controlling the first switch unit (120) to be disconnected, and controlling the second switch unit (131) and the third switch unit (134) to be closed; When starting heating, if it is detected that the duration of the conductive signal between the first detection end (132) and the second detection end (133) exceeds a preset duration, the first switch unit (120) is controlled to close, and the heating element starts heating.

10. The anti-dry burning control method according to claim 9, characterized in that: If it is detected that the duration of the conductive signal between the first detection terminal (132) and the second detection terminal (133) exceeds a preset duration, the first switch unit (120) is controlled to be closed, and the heating element starts heating. After that, the method further includes: The second switch unit (131) is controlled to be disconnected from the third switch unit (134).

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