Electrical protection device for a water heater and water heater

Abstract

The application relates to an electric protection device of a water heater and the water heater. The electric protection device of the water heater detects a leakage signal corresponding to an electric wall of the water heater through an electric wall detection module, so that a signal processing module can output a target filter signal to a comparison circuit module according to the leakage signal, an energy storage device module can store electric energy based on the leakage signal and output a reference signal to the comparison circuit module based on the stored electric energy, the comparison circuit module can output a switch control signal to a protection switch module according to the target filter signal and the reference signal, and then the protection switch module controls the working state of the electric wall according to the switch control signal, so as to achieve the purpose of leakage protection of the water heater.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of water heaters, in particular to a water heater and a live protection device of the water heater. BACKGROUND

[0002] At present, the direct-current gas water heater uses safe and special low-voltage power supply, and the internal voltage will not be higher than the safe and special voltage. This power supply mode is safe and reliable, and there is no need to worry about the harm to human body caused by electric leakage. According to the current relevant national standard requirements, this type of gas water heater does not need to be connected to the ground. However, in order to realize more functions, the current water heater usually uses variable frequency motors, which need to be driven by high-frequency alternating current. When the high-frequency low-voltage alternating current leaks, it can also cause harm to the human body. Of course, not only the motor can leak, due to the particularity of the installation of the water heater, other devices such as booster pumps, washing machines, etc. When the leakage occurs, the leakage can also be transmitted to the water heater through the water in the water pipe. Since this low-voltage direct-current water heater does not have a ground wire, the water heater will also be live. In the actual application process of the water heater, household electricity is usually not checked and maintained, and the use of electricity is not in accordance with the regulations. When the water heater leaks during use, it cannot effectively provide protection. SUMMARY

[0003] In order to solve the above technical problems, the present application provides a water heater and a live protection device of the water heater.

[0004] In a first aspect, the present application provides a live protection device of a water heater, comprising: an anti-electric wall detection module, a signal processing module, an energy storage device module, a comparison circuit module and a protection switch module;

[0005] The anti-electric wall detection module is configured to detect a leakage signal corresponding to an anti-electric wall of the water heater.

[0006] The signal processing module is configured to output a target filter signal to the comparison circuit module according to the leakage signal.

[0007] The energy storage device module is configured to store electric energy based on the leakage signal, and output a reference signal to the comparison circuit module based on the stored electric energy.

[0008] The comparison circuit module is configured to output a switch control signal to the protection switch module according to the target filter signal and the reference signal.

[0009] The protection switch module is configured to control the working state of the anti-electric wall according to the switch control signal.

[0010] Optionally, the signal processing module comprises a rectifier circuit, a flip-flop and a filter circuit.

[0011] The rectifier circuit is configured to rectify the leakage signal to generate a rectified output signal;

[0012] The flip-flop is configured to output a filtering trigger signal to the filter circuit based on the rectified output signal;

[0013] The filter circuit is configured to filter based on the filtering trigger signal to generate the target filtering signal.

[0014] Optionally, the electric charge protection device further comprises a master control module; and the signal processing module further comprises a voltage detection circuit.

[0015] The voltage detection circuit is configured to output a voltage detection signal corresponding to the leakage signal to the master control module based on the rectified output signal.

[0016] The master control module is configured to determine leakage information according to the voltage detection signal, and output leakage reminding information based on the leakage information.

[0017] Optionally, the comparison circuit module comprises a voltage comparison circuit.

[0018] A first end of the voltage comparison circuit is electrically connected to a filtering output end of the signal processing module, a second end of the voltage comparison circuit is electrically connected to an output end of the energy storage device module, and an output end of the voltage comparison circuit is electrically connected to a control input end of the protection switch module.

[0019] Optionally, the switch control signal is divided into a switch closing control signal and a switch opening control signal.

[0020] When the level of the target filtering signal is the same as the level of the reference signal, the voltage comparison circuit outputs the switch opening control signal, and the switch opening control signal is used to control the protection switch module to be opened.

[0021] When the level of the target filtering signal is different from the level of the reference signal, the voltage comparison circuit outputs the switch closing control signal, and the switch closing control signal is used to control the protection switch module to be turned on.

[0022] Optionally, the working state is divided into a first working state and a second working state.

[0023] In a case where the switch control signal is the switch closing control signal, the protection switch module controls the electric wall to enter the first working state.

[0024] In a case where the switch control signal is the switch opening control signal, the protection switch module controls the electric wall to enter the second working state.

[0025] Optionally, the number of the electric shock prevention walls is greater than one, and the electric shock prevention wall detection module comprises voltage detection probes connected to the electric shock prevention walls one by one;

[0026] The voltage detection probes are configured to detect leakage signals corresponding to target electric shock prevention walls connected to the voltage detection probes.

[0027] Optionally, the electric shock prevention walls comprise a first electric shock prevention wall and a second electric shock prevention wall, and the electric shock prevention wall detection module comprises a first voltage detection probe and a second voltage detection probe, the first voltage detection probe is configured to detect leakage signals corresponding to the first electric shock prevention wall, and the second voltage detection probe is configured to detect leakage signals corresponding to the second electric shock prevention wall, the first electric shock prevention wall is installed at a water inlet of the water heater, and the second electric shock prevention wall is installed at a water outlet of the water heater.

[0028] Optionally, the protection switch module comprises a relay.

[0029] The control end of the relay is electrically connected to the signal output end of the comparison circuit module, the first end of the relay is electrically connected to the first end of the electric shock prevention wall, and the second end of the relay is electrically connected to the second end of the electric shock prevention wall and the ground end of the water heater.

[0030] In a second aspect, the present application provides a water heater comprising the electric shock protection device of any one of claims 1-9.

[0031] The electric shock prevention wall detection module detects leakage signals corresponding to the electric shock prevention wall of the water heater, so that the signal processing module can output a target filter signal to the comparison circuit module according to the leakage signals, the energy storage device module can store electric energy based on the leakage signals and output a reference signal to the comparison circuit module based on the stored electric energy, the comparison circuit module can output a switch control signal to the protection switch module according to the target filter signal and the reference signal, and the protection switch module can control the working state of the electric shock prevention wall according to the switch control signal, thereby achieving the purpose of leakage protection for the water heater. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the application.

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, those skilled in the art can obtain other drawings from these drawings without any creative effort.

[0034] Figure 1 A structure schematic diagram of an electric protection device of a water heater is provided for an embodiment of the present application;

[0035] Figure 2 A structure schematic diagram of an electric protection device of a water heater is provided for another embodiment of the present application;

[0036] Figure 3 A specific judgment flowchart of a master control module of an electric protection device of a water heater is provided for an embodiment of the present application;

[0037] Figure 4 An application scene structure schematic diagram of an electric protection device of a water heater is provided for an embodiment of the present application;

[0038] Figure 5 A comparison circuit logic schematic diagram of an electric protection device of a water heater is provided for an embodiment of the present application;

[0039] Figure 6 Another application scene structure schematic diagram of an electric protection device of a water heater is provided for an embodiment of the present application;

[0040] Figure 7 Still another application scene structure schematic diagram of an electric protection device of a water heater is provided for an embodiment of the present application.

[0041] The drawing label: 11, an electric wall detection module; 111, a first voltage detection probe; 112, a second voltage detection probe; 12, a signal processing module; 121, a rectifier circuit; 122, a flip-flop; 123, a filter circuit; 13, an energy storage device module; 124, a voltage detection circuit; 14, a comparison circuit module; 15, a protection switch module; 16, an electric wall; 161, a first electric wall; 162, a second electric wall; 17, a master control module; 181, a water inlet; 182, a water outlet; 19, a natural gas pipeline. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0043] The direct current gas water heater is supplied with power at a very low voltage, and thus no ground wire is configured, so that when the gas water heater leaks electricity, the water pipe or water flow of the water heater is electrified, and the electricity cannot be conducted away from the ground wire; in the prior art, the natural gas pipeline connected with the gas water heater is usually used to conduct the leakage of the gas water heater to the ground, but only a metal corrugated pipe dedicated to gas can be used between the gas water heater and the natural gas pipeline, but if a larger leakage current passes through the metal corrugated pipe and the natural gas pipeline, the metal corrugated pipe and the natural gas pipeline will be burned through and gas leakage will occur.

[0044] Figure 1 A flowchart of an electrification protection device of a water heater provided by an embodiment of the present application.

[0045] As Figure 1 shown, the present application discloses an embodiment, which provides an electrification protection device of a water heater, comprising: an anti-electricity wall 16 detection module 11, a signal processing module 12, an energy storage device module 13, a comparison circuit module 14 and a protection switch module 15; wherein the anti-electricity wall 16 detection module 11 is used to detect the leakage signal corresponding to the anti-electricity wall 16 of the water heater; the signal processing module 12 is used to output a target filtered signal to the comparison circuit module 14 according to the leakage signal; the energy storage device module 13 is used to store electric energy based on the leakage signal, and output a reference signal to the comparison circuit module 14 based on the stored electric energy; the comparison circuit module 14 is used to output a switch control signal to the protection switch module 15 according to the target filtered signal and the reference signal; and the protection switch module 15 is used to control the working state of the anti-electricity wall 16 according to the switch control signal.

[0046] Specifically, in the process of using the water heater, the embodiment can detect the corresponding leakage signal of the electric shock prevention wall 16 of the water heater through the electric shock prevention wall 16 detection module 11. The electric shock prevention wall 16 can be installed at positions such as the water inlet 181 and the water outlet 182 of the water heater, and the electric shock prevention wall 16 detection module 11 can detect the voltage or current at the position of the electric shock prevention wall 16 as a leakage signal. For example, in the case of a voltage detection probe, the electric shock prevention wall 16 corresponds to a resistor. If the water heater leaks, a voltage will be formed at the electric shock prevention wall 16. At this time, the voltage detection probe can detect the corresponding voltage signal of the electric shock prevention wall 16 and determine the voltage signal as a leakage signal, so that the electric shock prevention wall 16 detection module 11 can output the detected leakage signal to the signal processing module 12. After receiving the leakage signal output by the electric shock prevention wall detection module, the signal processing module 12 can perform signal processing on the leakage signal. The signal processing can include one or more processing methods such as sorting and filtering, and generate a target filtered signal corresponding to the leakage signal, which can be output to the comparison circuit module 14. In addition, the electric shock prevention wall 16 detection module 11 can also output the leakage signal to the energy storage device module 13, so that the energy storage device module 13 can store electrical energy based on the leakage signal and output a reference signal based on the stored electrical energy to the comparison circuit module 14. That is, the comparison circuit module 14 can receive the target filtered signal output by the signal processing module 12 and the reference signal output by the energy storage device module 13, so that the comparison circuit can compare the target filtered signal and the reference signal, generate a switch control signal, and output the switch control signal to the protection switch module 15. After receiving the switch control signal, the protection switch module 15 can perform the control operation corresponding to the switch control signal, thereby controlling the working state of the electric shock prevention wall 16, that is, the working state of the electric shock prevention wall 16 can be controlled to play a role in live-line protection.

[0047] In specific implementation, the connection mode between the electric shock prevention wall 16 detection module 11, the signal processing module 12, the energy storage device module 13, the comparison circuit module 14 and the protection switch module 15 can be: the signal output end of the electric shock prevention wall 16 detection module 11 is electrically connected with the signal input end of the signal processing module 12, the signal output end of the electric shock prevention wall 16 detection module 11 is also electrically connected with the input end of the energy storage device module 13, the filter output end of the signal processing module 12 is electrically connected with the first signal output end of the comparison circuit module 14, the output end of the energy storage device module 13 is electrically connected with the second signal output end of the comparison circuit module 14, and the signal output end of the comparison circuit module 14 is electrically connected with the control input end of the protection switch module 15.

[0048] The anti-electricity wall 16 detection module 11 detects the leakage signal corresponding to the anti-electricity wall 16 of the water heater, so that the signal processing module 12 can output a target filter signal to the comparison circuit module 14 according to the leakage signal, and the energy storage device module 13 can store electric energy based on the leakage signal and output a reference signal to the comparison circuit module 14 based on the stored electric energy, so that the comparison circuit module 14 can output a switch control signal to the protective switch module 15 according to the target filter signal and the reference signal, and then the protective switch module 15 can control the working state of the anti-electricity wall 16 according to the switch control signal. For example, in the case of water heater leakage, the anti-electricity wall 16 can be controlled to enter the resistance protection mode, so that the anti-electricity wall 16 consumes the leakage voltage as resistance; in the case of electric shock, the anti-electricity wall 16 can be controlled to enter the short-circuit protection mode, so that the anti-electricity wall 16 is disconnected and the current can be guided to the ground from the natural gas pipeline 19, thereby eliminating the electric shock and achieving the purpose of protecting the water heater from leakage.

[0049] As shown in Figure 2 In an optional embodiment of the present application, the signal processing module 12 can include a rectifier circuit 121, a flip-flop 122, and a filter circuit 123; wherein the rectifier circuit 121 is configured to rectify the leakage signal to generate a rectified output signal; the flip-flop 122 is configured to output a filter trigger signal to the filter circuit 123 based on the rectified output signal; and the filter circuit 123 is configured to filter based on the filter trigger signal to generate a target filter signal.

[0050] In this embodiment, after receiving the leakage signal output by the anti-electricity wall 16 detection module 11, the rectifier circuit 121 rectifies the leakage signal to generate a rectified output signal, and outputs the rectified output signal to the flip-flop 122 and the filter circuit 123. The flip-flop 122 outputs a filter trigger signal corresponding to the rectified output signal to the filter circuit 123, and the filter circuit 123 filters the rectified output signal based on the filter trigger signal to generate a target filter signal. That is, the filter circuit 123 needs to perform filtering operation in combination with the filter trigger signal and the rectified output signal.

[0051] In specific implementation, the connection mode of the rectifier circuit 121, the flip-flop 122, and the filter circuit 123 can be: the input end of the rectifier circuit 121 is electrically connected to the signal output end of the anti-electricity wall 16 detection module 11 as the signal input end of the signal processing module 12, the first output end of the rectifier circuit 121 is electrically connected to the input end of the flip-flop 122, the output end of the flip-flop 122 is electrically connected to the first input end of the filter circuit 123, the second output end of the rectifier circuit 121 is electrically connected to the second input end of the filter circuit 123, and the output end of the filter circuit 123 is electrically connected to the first signal output end of the comparison circuit module 14 as the filter output end of the signal processing module 12.

[0052] In an example, the filter trigger signal output by the trigger 122 can be divided into a trigger signal and a non-trigger signal, that is, the trigger 122 can generate a trigger signal or a non-trigger signal according to the rectified output signal. Specifically, the trigger 122 can generate a corresponding filter trigger signal according to the voltage value of the rectified output signal. For example, when the voltage value of the rectified output signal is lower than the preset filter voltage threshold, it can be determined that the water heater has no leakage or the leakage voltage is small and will not cause damage. At this time, the trigger 122 can generate a non-trigger signal, which does not trigger the filter circuit 123 to work. At this time, the filter circuit 123 does not work, that is, the filter circuit 123 does not perform filter processing and output. When the leakage voltage of the water heater is relatively high and may cause damage, that is, when the voltage value of the rectified output signal is higher than the preset filter voltage threshold, the trigger 122 can generate a trigger signal according to the rectified output signal as a filter trigger signal and transmit it to the filter circuit 123. Thus, the filter circuit 123 can be triggered by the trigger signal to perform filter processing and output a target filter signal to the comparison circuit module 14. Thus, the comparison circuit module 14 can compare the target filter signal with the reference signal to generate a switch control signal.

[0053] For example, in the case of taking a high-level signal as a trigger signal and a low-level signal as a non-trigger signal, when the voltage value of the rectified output signal is lower than the preset filter voltage threshold, the trigger 122 can output a low-level signal as a filter trigger signal and transmit it to the filter circuit 123. At this time, the low-level signal cannot trigger the filter circuit 123 to work, that is, the filter circuit 123 does not perform filter processing. When the voltage value of the rectified output signal is higher than the preset filter voltage threshold, that is, when the leakage voltage of the water heater is relatively high and may cause damage, the trigger 122 can generate a high-level signal according to the rectified output signal as a filter trigger signal and transmit it to the filter circuit 123. Thus, the filter circuit 123 can be triggered to perform filter processing and output a target filter signal to the comparison circuit module 14. When the water heater leaks, the signal processing module 12 can output the target filter signal to the comparison circuit module 14. Thus, the comparison circuit module 14 can compare the target filter signal with the reference signal to generate a switch control signal and output it to the protection switch module 15. Thus, the protection switch module 15 can control the working state of the anti-electricity wall 16 to achieve the purpose of protecting the water heater from leakage.

[0054] In an optional embodiment of the present application, the electric charge protection device further comprises a master control module 17; the signal processing module 12 further comprises a voltage detection circuit 124; the voltage detection circuit 124 is configured to output a voltage detection signal corresponding to the electric leakage signal based on the rectified output signal to the master control module 17; and the master control module 17 is configured to determine the electric leakage information according to the voltage detection signal and output the electric leakage reminding information based on the electric leakage information.

[0055] In the embodiment, the voltage detection circuit 124 receives the rectified output signal output by the rectifier circuit 121 and performs detection processing on the rectified output signal, such as detecting the voltage size, the voltage frequency, etc., to generate the voltage detection signal, i.e., the voltage detection signal can contain the electric leakage voltage and the voltage frequency, etc.; after receiving the voltage detection signal, the master control module 17 can perform electric leakage analysis on the voltage detection signal to obtain the electric leakage information, which can contain the alternating current electric leakage, the direct current electric leakage, the electric leakage reminding strategy, etc., and output the electric leakage reminding information according to the electric leakage information, which can be the light information, the buzzer information, etc.

[0056] In the embodiment, the connection mode of the master control module 17 and the voltage detection circuit 124 can be that the input end of the voltage detection circuit 124 is electrically connected with the third output end of the rectifier circuit 121, and the output end of the voltage detection circuit 124 is electrically connected with the input end of the master control module 17.

[0057] As shown in an example, Figure 3 The specific mode of the master control module 17 performing electric leakage analysis can be that the electric leakage voltage U1 is determined according to the voltage detection signal, when U1 is less than a preset Umin, it is considered that the electric leakage voltage is not caused by the electric leakage of the water heater, at this time the output electric leakage reminding information can be the no reminding control instruction; when U1 is greater than Umin and less than Umax, it can be determined that the electric leakage of the water heater occurs but the voltage is small and will not harm the human body, at this time the output electric leakage reminding information can be the electric leakage indicator light control instruction, which is used to control the electric leakage indicator light to be controlled to be bright; when U1 is greater than Umax, it can be determined that the electric leakage voltage is large and can harm the human body, since the safety voltage threshold of the alternating current and the direct current to the human body is different, at this time the voltage frequency F1 can be determined according to the voltage detection signal, whether it is the alternating current electric leakage or the direct current electric leakage is determined by judging whether F1 is greater than Umax, if it is the alternating current electric leakage, the peak value or the effective value of the voltage is collected to be compared with the safety voltage threshold according to the national standard; if it is the direct current electric leakage, it can be directly compared with the safety voltage threshold according to the national standard, and the specific determination mode is as shown in Figure 3As shown; after the leakage voltage exceeds the corresponding safety voltage, the leakage warning information of the leakage warning reminder instruction can be generated, which can be used to control the indicator light to flash, the buzzer to alarm, etc., so as to remind the user to stop using water to troubleshoot the leakage problem; more specifically, different leakage warning information can be generated according to the direct current leakage or alternating current leakage, so that the user can determine the leakage type according to the different leakage warning information, and then quickly locate the leakage position or the electrical appliance.

[0058] In an optional embodiment of the present application, the comparison circuit module 14 comprises a voltage comparison circuit; wherein the first end of the voltage comparison circuit is electrically connected with the filter output end of the signal processing module 12, the second end of the voltage comparison circuit is electrically connected with the output end of the energy storage device module 13, and the output end of the voltage comparison circuit is electrically connected with the control input end of the protection switch module 15.

[0059] In the embodiment, the voltage comparison circuit can be a comparator or other equivalent circuit structure capable of comparison; the first end of the voltage comparison circuit is used to receive the target filter signal output by the signal processing module 12, the second end of the voltage comparison circuit is used to receive the reference signal output by the energy storage device module 13, and the voltage comparison circuit compares the target filter signal and the reference signal according to the preset comparison strategy, thereby generating a switch control signal and outputting the switch control signal to the protection switch module 15 through the output end of the voltage comparison circuit.

[0060] In an optional embodiment of the present application, the switch control signal is divided into switch closing control signal and switch opening control signal; when the level of the target filter signal is the same as the level of the reference signal, the voltage comparison circuit outputs the switch opening control signal, which is used to control the protection switch module 15 to open; when the level of the target filter signal is not the same as the level of the reference signal, the voltage comparison circuit outputs the switch closing control signal, which is used to control the protection switch module 15 to conduct.

[0061] In the process of comparison processing of the voltage comparison circuit in the embodiment, the level of the target filter signal and the level of the reference signal can be compared, and in the case that the level of the target filter signal is the same as the level of the reference signal, the voltage comparison circuit can output the switch opening control signal, which is used to control the protection switch module 15 to open, otherwise, in the case that the level of the target filter signal is not the same as the level of the reference signal, the voltage comparison circuit can output the switch closing control signal, which is used to control the protection switch module 15 to conduct.

[0062] In specific implementation, as shown in the figure, Figures 4-5 the specific comparison output switch control signal of the voltage comparison circuit can be as shown in the figureFigure 5 As shown, Figure 5 A curve represents the target filter signal level, B curve represents the reference signal level, C curve represents the level of switch control signal. In the case of electric leakage of water heater, due to the presence of the equivalent second resistance R2 of the anti-electricity wall 16 at this time, the current flowing into the water heater is small, which can be blocked by the second resistance R2. At the same time, the signal processing module 12 detects that the leakage voltage is higher than the threshold value, and the output target filter signal is high level; And the leakage voltage can also charge the energy storage device module 13, at this time the energy storage device outputs the reference signal as high level, and the voltage comparison circuit receives the high level reference signal and the high level target filter signal, and the voltage comparison circuit can output the switch open control signal at this time because the two levels are the same. The switch open control signal can be low, and the switch open control signal is used to control the protection switch module 15, that is, the second resistance R2 is disconnected. The human body equivalent circuit is the first switch K1 and the first resistance R1, if the user contacts the electric leakage waterway at this time, it means that the first switch K1 is closed, because the second resistance R2 is much larger than the first resistance R1, so that the human body is equivalent to short circuit the second resistance R2, the current flows from the human body, and the human body is electric shock; At this time, the signal processing module 12 detects that the leakage voltage is lower than the threshold value, and the output target filter signal is low level, because the energy of the energy storage device is not consumed, it can still output high level reference signal, and the comparison circuit detects that the reference signal is high level and the target filter signal is low level, the two levels are not the same, at this time the voltage comparison circuit can output the switch closing control signal, the switch closing control signal can be high, so that the second switch K2 is closed, the second resistance R2 is short-circuited, so that the anti-electricity wall 16 is short-circuited; Because the second switch K2 is closed, it is equivalent to a wire, and the resistance is much smaller than the human body equivalent resistance first resistance R1, so that the electric leakage current flows into the water heater from the second switch K2, and then flows to the ground from the natural gas pipeline 19, which is equivalent to the function of the ground wire in the power grid, so that the human body is out of the electric shock state, and can leave the waterway as soon as possible. At the same time, the circuit leakage current flows to the ground at this time, which cannot charge the energy storage device, when the energy of the energy storage device is consumed, the energy storage device outputs low level reference signal, so that the voltage comparison circuit receives low level reference signal and low level target filter signal at this time, because the two levels are the same, the voltage comparison circuit can output the switch open control signal, and the second switch K2 is automatically opened to complete the reset, and the anti-electricity wall 16 is reactivated; That is, in the case of electric leakage of water heater, if there is no human body electric shock, the second resistance R2 can be blocked by the anti-electricity wall 16, and if there is human body electric shock, the second resistance R2 can be disconnected to make the human body out of the electric shock state, and after the energy of the energy storage device is consumed, the second resistance R2 can be reconnected for protection. It should be noted that the energy storage device in the embodiment does not depend on the power supply of the water heater body, so when the water heater is powered off, the electric protection device in the embodiment can still be activated normally.

[0063] In an optional embodiment of the present application, the working state can be divided into a first working state and a second working state; and in the case of the switch control signal being a switch closing control signal, the protection switch module 15 controls the electric wall 16 to enter the first working state; and in the case of the switch control signal being a switch opening control signal, the protection switch module 15 controls the electric wall 16 to enter the second working state.

[0064] Specifically, the working state of the electric wall 16 is divided into two states, wherein the first working state indicates that the electric wall 16 is in a conducting state, and when the current flowing into the water heater is small, the electric wall 16 can play a role of an equivalent resistor to block the current; the second working state indicates that the electric wall 16 is in a short-circuit state, and at this time, the electric current will flow from the protection switch module 15 into the water heater, and then flow from the natural gas pipeline 19 to the ground, which is equivalent to the role of the ground wire in the power grid, at this time, the human body can be out of the electric shock state, thereby playing a role of protecting the human body from electric shock. In the present embodiment, after the comparison circuit module 14 compares the levels of the target filtered signal and the reference signal and outputs the switch control signal to the protection switch module 15, the protection switch module 15 controls the electric wall 16 to enter different states according to different switch control signals. Specifically, in the case of the switch control signal being a switch closing control signal, the protection switch module 15 controls the electric wall 16 to enter the first working state, so that the water heater can use the electric wall 16 as a resistor to block the current when the electric leakage occurs but the human body is not in the electric shock state; and in the case of the switch control signal being a switch opening control signal, the protection switch module 15 controls the electric wall 16 to enter the second working state, so that the water heater can use the short-circuit electric wall 16 to guide the electric leakage current to the natural gas pipeline 19 to flow to the ground when the electric leakage occurs and the human body is in the electric shock state, thereby playing a role of allowing the human body to be out of the electric shock state.

[0065] In an optional embodiment of the present application, the number of electric walls 16 is greater than one, and the electric wall 16 detection module 11 comprises voltage detection probes connected one by one with the electric walls 16; wherein the voltage detection probes are used to detect the electric leakage signals corresponding to the target electric wall 16, and the target electric wall 16 is the electric wall 16 connected with the voltage detection probe.

[0066] In the present embodiment, the electric wall 16 can be provided at least two, at this time, the electric wall 16 detection module 11 can comprise voltage detection probes connected one by one with the electric walls 16, that is, the voltage detection probes can be consistent with the number of electric walls 16 and connected one by one; so that each voltage detection probe can accurately detect the electric leakage signal corresponding to the target electric wall 16 connected therewith; wherein the electric wall 16 can be provided at the water inlet 181, the water outlet 182 and the like of the water heater, and the connection mode of the electric wall 16 and the voltage detection probe can be as shown in the following figure: Figure 6As shown.

[0067] like Figures 6-7 As shown, in an optional embodiment of this application, the anti-electric shock wall 16 includes a first anti-electric shock wall 161 and a second anti-electric shock wall 162. The detection module 11 of the anti-electric shock wall 16 includes a first voltage detection probe 111 and a second voltage detection probe 112. The first voltage detection probe 111 is used to detect the leakage signal corresponding to the first anti-electric shock wall 161, and the second voltage detection probe 112 is used to detect the leakage signal corresponding to the second anti-electric shock wall 162. The first anti-electric shock wall 161 is installed at the inlet 181 of the water heater, and the second anti-electric shock wall 162 is installed at the outlet 182 of the water heater.

[0068] In this embodiment, two anti-electric shock walls 16 are provided: a first anti-electric shock wall 161 installed at the water inlet 181 of the water heater and a second anti-electric shock wall 162 installed at the water outlet 182 of the water heater. The anti-electric shock wall 16 detection module 11 includes a first voltage detection probe 111 and a second voltage detection probe 112, wherein the first voltage detection probe 111 is electrically connected to the first anti-electric shock wall 161 and the second voltage detection probe 112 is electrically connected to the second anti-electric shock wall 162, so that the first voltage detection probe 111 can detect the leakage current signal corresponding to the first anti-electric shock wall 161 and the second voltage detection probe 112 can detect the leakage current signal corresponding to the second anti-electric shock wall 162. The first voltage detection probe 111 and the second voltage detection probe 112 can output the leakage current signal they detect to the signal processing module 12, the energy storage device module 13, and the main control module 17 through the signal output terminal.

[0069] In one alternative embodiment of this application, the protective switch module 15 includes a relay;

[0070] The control terminal of the relay is electrically connected to the signal output terminal of the comparator circuit module 14, the first terminal of the relay is electrically connected to the first terminal of the anti-electric wall 16, and the second terminal of the relay and the second terminal of the anti-electric wall 16 are electrically connected to the grounding terminal of the water heater.

[0071] The protective switch module 15 in this embodiment may include a relay. The relay includes a control terminal electrically connected to the signal output terminal of the comparator circuit module 14, a first terminal electrically connected to the first terminal of the anti-electric wall 16, and a second terminal electrically connected to the second terminal of the anti-electric wall 16 and the ground terminal of the water heater. This allows the relay to receive the switch control signal output by the comparator circuit module 14 through its control terminal, controlling the first and second terminals of the relay to be on or off, thereby changing the working state of the anti-electric wall 16 connected in parallel. For example, if the first and second terminals of the control relay are on, the anti-electric wall 16 will be disconnected; if the first and second terminals are off, the anti-electric wall 16 will be on. For specific implementation, refer to the aforementioned embodiments and...Figure 4 The relay in the embodiment can be equivalent to Figure 4 the second switch K2 in the circuit.

[0072] It should be noted that, in the embodiment, since the gas water heater can not have a power supply ground wire, the grounding end of the water heater can be a structure such as a natural gas pipeline 19 of the water heater that can guide the leakage current to the ground; of course, for the water heater that has a power supply ground wire, the grounding end can also be the power supply ground wire, which is not limited in the embodiment.

[0073] As shown in Figure 5 , the application also discloses an embodiment, which provides a water heater including the electric protection device of the water heater according to any one of the preceding embodiments.

[0074] It should be noted that, in this document, relational terms such as "first" and "second", and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by the statement "comprising a... " does not exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0075] The above describes specific embodiments of the embodiments of the present specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in an order different than the order in the embodiments and still achieve the desired result. In addition, the processes depicted in the figures do not necessarily require the particular order shown or sequential order to achieve the desired results. In certain implementations, multitasking and parallel processing can be advantageous or possible.

[0076] The above is only a specific implementation of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications of these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. An electrical protection device for a water heater, the device comprising: The device comprises a leakage protection wall detection module, a signal processing module, an energy storage device module, a comparison circuit module, and a protection switch module. The leakage protection wall detection module is configured to detect a leakage signal corresponding to the leakage protection wall of the water heater. The signal processing module is configured to output a target filter signal to the comparison circuit module according to the leakage signal. The energy storage device module is configured to store electric energy based on the leakage signal and output a reference signal to the comparison circuit module based on the stored electric energy. The comparison circuit module is configured to output a switch control signal to the protection switch module according to the target filter signal and the reference signal. The protection switch module is configured to control the working state of the leakage protection wall according to the switch control signal. The comparison circuit module comprises a voltage comparison circuit. The first end of the voltage comparison circuit is electrically connected to the filter output end of the signal processing module, the second end of the voltage comparison circuit is electrically connected to the output end of the energy storage device module, and the output end of the voltage comparison circuit is electrically connected to the control input end of the protection switch module. The switch control signal is divided into a switch closing control signal and a switch opening control signal. When the level of the target filter signal is the same as the level of the reference signal, the voltage comparison circuit outputs the switch opening control signal, which is used to control the protection switch module to open. When the level of the target filter signal is different from the level of the reference signal, the voltage comparison circuit outputs the switch closing control signal, which is used to control the protection switch module to close. The working state is divided into a first working state and a second working state. In the case of the switch control signal being the switch closing control signal, the protection switch module controls the leakage protection wall to enter the first working state, and the leakage protection wall is short-circuited. In the case of the switch control signal being the switch opening control signal, the protection switch module controls the leakage protection wall to enter the second working state, and the leakage protection wall is activated. The signal processing module comprises a rectifier circuit, a flip-flop, and a filter circuit.

2. The electrical protection device for a water heater of claim 1, wherein, The rectifier circuit is configured to rectify the leakage signal to generate a rectified output signal. The flip-flop is configured to output a filter trigger signal to the filter circuit based on the rectified output signal. The filter circuit is configured to filter based on the filter trigger signal to generate the target filter signal. The device further comprises a master control module, and the signal processing module further comprises a voltage detection circuit.

3. A galvanic protection device for a water heater as claimed in claim 2, characterised in that, The voltage detection circuit is configured to output a voltage detection signal corresponding to the leakage signal to the master control module based on the rectified output signal. The master control module is configured to determine leakage information according to the voltage detection signal and output a leakage reminder information based on the leakage information. The number of leakage protection walls is greater than one, and the leakage protection wall detection module comprises a voltage detection probe connected one-to-one with the leakage protection wall.

4. The galvanic protection device for a water heater of claim 1, wherein, ​ The voltage detection probe is used for detecting a leakage signal corresponding to a target electric protection wall connected with the voltage detection probe.

5. The electrical protection device for a water heater of claim 1, wherein, The electric protection wall comprises a first electric protection wall and a second electric protection wall, and the electric protection wall detection module comprises a first voltage detection probe and a second voltage detection probe.

6. An electrical protection device for a water heater as claimed in any one of claims 1 to 5, characterised in that, The first voltage detection probe is used for detecting a leakage signal corresponding to the first electric protection wall, and the second voltage detection probe is used for detecting a leakage signal corresponding to the second electric protection wall. The protection switch module comprises a relay.

7. A water heater, characterised by A control end of the relay is electrically connected with a signal output end of the comparison circuit module, a first end of the relay is electrically connected with a first end of the electric protection wall, and a second end of the relay is electrically connected with a second end of the electric protection wall and a grounding end of the water heater. The electric protection device comprises the water heater.

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