CN214746454U - Electric leakage detection system and electric water heater - Google Patents
Electric leakage detection system and electric water heater Download PDFInfo
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- CN214746454U CN214746454U CN202120833704.2U CN202120833704U CN214746454U CN 214746454 U CN214746454 U CN 214746454U CN 202120833704 U CN202120833704 U CN 202120833704U CN 214746454 U CN214746454 U CN 214746454U
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Abstract
The utility model relates to an electric leakage detection system and water heater is being provided with magnetic induction coil in being used for storing water and carrying out the heating box that heats to the water that stores, when taking place electric current leakage to heating box, magnetic induction coil can sense the magnetic field intensity change in the heating box, turns into the electric energy with the magnetic field in the aquatic through electromagnetic induction to the electric leakage detection circuit who is connected with it detects and obtains. The electric leakage detection circuit generates an electric leakage signal according to the detected induced electromotive force, and the controller generates a power-off control signal according to the electric leakage signal and transmits the power-off control signal to the power-off control circuit to enable the power-off control circuit to act and cut off the connection between an external power supply and the heating device. By the scheme, whether current leakage exists in the heating box body can be directly detected by using the magnetic induction coil, the operation of the heating device is directly stopped under the condition of electric leakage, the leaked current can be prevented from being directly sprayed to a user from a water outlet of the heating box body, and the use safety of electric heating equipment such as an electric water heater is effectively ensured.
Description
Technical Field
The present application relates to the field of electrical heating technology, and in particular, to an electrical leakage detection system and an electric water heater.
Background
With the development of the electric heating technology, electric heating equipment represented by an electric water heater is more and more widely used in daily life of people. When the electric heating equipment is used, water and electricity are not separated, and a heating element (generally a heating rod) is directly arranged in a heating box body and is in contact with water to heat the water, so that the heating efficiency is high, but the serious electric leakage safety problem also exists.
In order to avoid the safety problem of electric leakage, the traditional electric heating equipment generally adopts measures of an electricity-proof wall, an electric leakage protection switch and a cabinet grounding. However, the safety performance of these measures is not stable enough, and there still exists a certain safety hazard, and the safety of the electric heating device is still not effectively guaranteed.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide an electric leakage detection system and an electric water heater for solving the problem that the safety performance of the conventional electric heating device cannot be effectively guaranteed.
An electrical leakage detection system, comprising: the magnetic induction coil is arranged in the heating box body and used for generating induced electromotive force when current leaks into water in the heating box body; the leakage detection circuit is connected with the first end of the magnetic induction coil and the second end of the magnetic induction coil and used for generating a leakage signal according to the induced electromotive force when the magnetic induction coil generates the induced electromotive force; the controller is connected with the electric leakage detection circuit and used for generating a power-off control signal according to the electric leakage signal; and the power-off control circuit is connected with the controller, arranged between the external power supply and the heating device and used for cutting off the connection between the heating device and the external power supply when receiving the power-off control signal output by the controller.
In one embodiment, the leakage detection circuit includes a first diode, a second diode and a first switch device, an anode of the first diode is connected to the first end of the magnetic induction coil, a cathode of the first diode is connected to the first end of the first switch device, an anode of the second diode is connected to the second end of the magnetic induction coil, a cathode of the second diode is connected to the first end of the first switch device, a second end of the first switch device is connected to a power supply, and a third end of the first switch device is connected to the controller.
In one embodiment, the first switching device is an optocoupler device.
In one embodiment, the leakage detection circuit further includes a first resistor, a second resistor, a third resistor and a fourth resistor, a first terminal of the first resistor is connected to the cathode of the first diode and the cathode of the second diode, a second terminal of the first resistor is connected to the first terminal of the second resistor and the first terminal of the first switching device, a second terminal of the second resistor is grounded, a first terminal of the third resistor is connected to the third terminal of the first switching device and the first terminal of the fourth resistor, a second terminal of the third resistor is grounded, and a second terminal of the fourth resistor is connected to the controller.
In one embodiment, the leakage detection circuit further includes a first capacitor and a second capacitor, a first end of the first capacitor is connected to the second end of the first resistor, a second end of the first capacitor is grounded, a first end of the second capacitor is connected to the first end of the first capacitor and the first end of the second resistor, and a second end of the second capacitor is connected to the second end of the first capacitor and the second end of the second resistor.
In one embodiment, the power-off control circuit comprises a second switch device, an information prompting device and a relay device, wherein a first end of the second switch device is connected with the controller, a second end of the second switch device is connected with the power supply, a third end of the second switch device is connected with a first end of the information prompting device, a second end of the information prompting device is grounded, a first end of a coil of the relay device is connected with a second end of the information prompting device, a second end of the coil of the relay device is grounded, a first switch contact of the relay device is connected with an external power supply, a second switch contact of the relay device is used for being connected with a first end of a heating device, and a second end of the heating device is connected with the external power supply.
In one embodiment, the power-off control circuit further includes a fifth resistor, a sixth resistor and a seventh resistor, the controller is connected to the first end of the second switching device through the fifth resistor, the second end of the information prompting device is connected to the first end of the sixth resistor and the first end of the seventh resistor, the second end of the sixth resistor is grounded, and the second end of the seventh resistor is connected to the first end of the coil of the relay device.
In one embodiment, the power-off control circuit further includes a third diode, an anode of the third diode is connected to the second end of the coil of the relay device, and a cathode of the third diode is connected to the first end of the coil of the relay device and the second end of the seventh resistor.
In one embodiment, the information prompting device is a light emitting diode.
An electric water heater comprises the electric leakage detection system.
According to the electric leakage detection system and the water heater, the magnetic induction coil is arranged in the heating box body used for storing water and heating the stored water, when current leaks to the heating box body, the magnetic induction coil can sense the magnetic field intensity change in the heating box body, the magnetic field in the water is converted into electric energy through electromagnetic induction, and the electric leakage detection circuit is connected with the electric leakage detection coil to detect the electric leakage. The electric leakage detection circuit generates an electric leakage signal according to the detected induced electromotive force, and the controller generates a power-off control signal according to the electric leakage signal and transmits the power-off control signal to the power-off control circuit, so that the power-off control circuit arranged between the external power supply and the heating device acts to cut off the connection between the external power supply and the heating device. By the scheme, whether current leakage exists in the heating box body can be directly detected by using the magnetic induction coil, the operation of the heating device is directly stopped under the condition of electric leakage, the leaked current can be prevented from being directly sprayed to a user from a water outlet of the heating box body, and the use safety of electric heating equipment such as an electric water heater is effectively ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of an embodiment of a leakage detection system;
FIG. 2 is a schematic diagram illustrating an exemplary magnetic induction coil arrangement;
FIG. 3 is a schematic diagram illustrating a position of a magnetic induction coil according to another embodiment;
FIG. 4 is a schematic diagram of an embodiment of a leakage detection circuit;
FIG. 5 is a schematic diagram of a leakage detection circuit according to another embodiment;
FIG. 6 is a diagram illustrating an exemplary power down control circuit;
FIG. 7 is a diagram of another embodiment of a power down control circuit.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Referring to fig. 1, an electrical leakage detecting system includes: a magnetic induction coil 10 disposed inside the heating cabinet (not shown) for generating an induced electromotive force when a current leaks into water in the heating cabinet; the electric leakage detection circuit 20 is connected with the first end of the magnetic induction coil 10 and the second end of the magnetic induction coil 10, and is used for generating an electric leakage signal according to the induced electromotive force when the magnetic induction coil 10 generates the induced electromotive force; the controller 40 is connected with the leakage detection circuit 20 and used for generating a power-off control signal according to the leakage signal; and a power-off control circuit 30, connected to the controller 40, disposed between the external power supply and the heating device, for cutting off the connection between the heating device and the external power supply when receiving a power-off control signal output by the controller 40.
Specifically, to the electrical heating equipment that adopts heating devices such as heating rods to carry out water heating, generally all directly expose the heating device in aqueous, realize the water heating operation with electric energy conversion for heat energy, this type of electrical heating equipment all can have the electric leakage risk, when the user draws forth hot water through the delivery port that sets up in the heating box of electrical heating equipment, will take place to electrocute danger. In the solution of this embodiment, for this type of electric heating device, a magnetic induction coil 10 is directly disposed in the heating tank for storing water and heating water, and in case of electric leakage in the heating tank, the electric leakage is directly induced by the magnetic induction coil 10. Based on the electromagnetic induction principle, the magnetic induction coil 10 converts the abrupt change of the magnetic field caused by the current leakage into an induced electromotive force, which can be detected by the leakage detection circuit 20.
It is to be understood that the specific types of the leakage detecting circuit 20 and the power-off control circuit 30 are not exclusive, and the power-off control of the heating device may be implemented by the power-off control circuit 30 as long as the induced electromotive force generated by the magnetic induction coil 10 is detected and the state of the magnetic induction coil 10 is finally notified to the power-off control circuit 30.
It should be noted that the position of the magnetic induction coil 10 in the heating cabinet is not exclusive, as long as it can generate induced electromotive force in time when current leakage occurs inside the heating cabinet. In an embodiment, taking the application of the electrical leakage detection system in an electric water heater as an example, please refer to fig. 2, it is only required to dispose the induction coil around the heating device 50 and the magnesium rod 60 for protecting the heating device 50, and then respectively draw out two ports of the induction coil to connect to the electrical leakage detection circuit 20. In another embodiment, please refer to fig. 3, the magnetic induction coil 10 may be designed to surround the water outlet 80, and then two ports of the magnetic induction coil 10 are led out respectively and connected to the leakage detecting circuit 20.
In this embodiment, the leakage signal generated by the leakage detecting circuit 20 based on the induced electromotive force of the magnetic induction coil 10 is transmitted to the controller 40 to be analyzed, and finally, the controller 40 controls the operation of the power-off control circuit 30. It is understood that, in other embodiments, the leakage detecting circuit 20 may be directly connected to the power-off control circuit 30, and the control of the power-off control circuit 30 may be directly implemented by the leakage signal output by the leakage detecting circuit 20.
In the present embodiment, after the leakage detection circuit 20 generates the leakage signal based on the induced electromotive force generated by the magnetic induction coil 10, the power-off control circuit 30 is not directly controlled to start operation based on the leakage signal, but the leakage signal is transmitted to the controller 40 to be stored, and then the controller 40 further generates the control signal to control the leakage signal operation. Through the scheme of the embodiment, the controller 40 is added between the electric leakage detection circuit 20 and the power-off control circuit 30, so that the memory storage of the electric leakage detection operation of the electric heating equipment and the power-on and power-off control of the heating device can be realized, the historical electric leakage record of the electric heating equipment can be conveniently known, and the working reliability of the electric leakage detection system is effectively improved.
Referring to fig. 4, in an embodiment, the leakage detecting circuit 20 includes a first diode D1, a second diode D2, and a first switching device U1, an anode of the first diode D1 is connected to the first end of the magnetic induction coil 10, a cathode of the first diode D1 is connected to the first end of the first switching device U1, an anode of the second diode D2 is connected to the second end of the magnetic induction coil 10, a cathode of the second diode D2 is connected to the first end of the first switching device U1, a second end of the first switching device U1 is connected to the power supply, and a third end of the first switching device U1 is connected to the controller 40.
Specifically, in the present embodiment, the first diode D1 is disposed between the leakage detecting circuit 20 and the first end of the magnetic induction coil 10, and the second diode D2 is disposed between the leakage detecting circuit 20 and the second end of the magnetic induction coil 10, so that the output of the magnetic induction coil 10 can be rectified by the arrangement of the first diode D1 and the second diode D2, thereby effectively improving the operational reliability of the leakage detecting system.
It should be noted that the type of the first switching device U1 is not exclusive, and any device may be used as long as it can perform a switching operation to output different types of signals in both a state where induced electromotive force is generated by the magnetic induction coil and a state where induced electromotive force is not generated, such as a transistor, a mosfet, and the like.
Further, in a more detailed embodiment, the first switching device U1 employs an optical coupler device, and the optical coupler device is also called an Optical Coupler (OCEP) or a photoelectric isolator or a photoelectric coupler, which is referred to as an optical coupler for short. The device is a device for transmitting electric signals by taking light as a medium, and usually a light emitter (generally an infrared light emitting diode) and a light receiver (generally a photosensitive semiconductor tube or a triode and the like) are packaged in the same tube shell. When an electric signal is applied to the first end of the light emitter (the anode of the infrared light-emitting diode), the light emitter emits light, and after the light receiver receives the light, a photocurrent is generated and finally output from the second end of the light receiver. Thus realizing 'electro-optic-electro' control. The said circuit has the advantages of small size, long service life, no contact, high anti-interference capacity, insulation between output and input, unidirectional signal transmission, etc. and may be used widely in digital circuit.
When first switching device U1 adopts the opto-coupler device, regard the first end of the illuminator of opto-coupler device as first switching device U1's first end, regard the first end of the photic ware of opto-coupler device as the second end of first switching device U1, regard the second end of the photic ware of opto-coupler device as the third end of first switching device U1, the second end ground connection of the illuminator of opto-coupler device simultaneously to make the opto-coupler device insert in electric leakage detection circuit 20 as first switching device U1. In the scheme of this embodiment, when there is the induced electromotive force to produce in magnetic induction coil 10, after first diode D1 and second diode D2 through electric leakage detection circuit 20 carried out the rectification, transmit the first end of the illuminator of opto-coupler device, the illuminator of opto-coupler device produced light signal, make and switch on between the first end of photic ware and the second end of photic ware, the power of the first end of photic ware will be exported through the second end of photic ware, also this moment the output high level signal of opto-coupler device.
In one embodiment, the high level signal can be directly transmitted to the power-off control circuit 30 for power-off control of the heating device, and in another embodiment, the high level signal can also be transmitted to the controller 40, and after the controller 40 further memorizes and stores the high level signal, the controller 40 further outputs a control signal to the power-off control circuit 30 to realize power-off control of the heating device.
Referring to fig. 5, in an embodiment, the leakage detecting circuit 20 further includes a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4, a first end of the first resistor R1 is connected to a cathode of the first diode D1 and a cathode of the second diode D2, a second end of the first resistor R1 is connected to a first end of the second resistor R2 and a first end of the first switching device U1, a second end of the second resistor R2 is grounded, a first end of the third resistor R3 is connected to a third end of the first switching device U1 and a first end of the fourth resistor R4, a second end of the third resistor R3 is grounded, and a second end of the fourth resistor R4 is connected to the controller 40.
Specifically, in this embodiment, a first resistor R1 and a second resistor R2 are further provided between the output of the first diode D1 and the first switching device U1, between the output of the second diode D2 and the first switching device U1 for performing the current limiting operation, and a third resistor R3 and a fourth resistor R4 are further provided between the output of the first switching device U1 and the controller 40 (or between the output of the first switching device U1 and the power-off control circuit 30) for performing the current limiting operation.
Referring to fig. 5, in an embodiment, the leakage detecting circuit 20 further includes a first capacitor C1 and a second capacitor C2, a first end of the first capacitor C1 is connected to a second end of the first resistor R1, a second end of the first capacitor C1 is grounded, a first end of the second capacitor C2 is connected to a first end of the first capacitor C1 and a first end of the second resistor R2, and a second end of the second capacitor C2 is connected to a second end of the first capacitor C1 and a second end of the second resistor R2.
Specifically, in the scheme of this embodiment, a first capacitor C1 and a second capacitor C2 are further disposed between the first resistor R1 and the second resistor R2, and noise in the electrical signal flowing into the first switching device U1 can be filtered by the first capacitor C1 and the second capacitor C2, so that the operational reliability of the leakage detection circuit 20 is further improved.
Referring to fig. 6, in an embodiment, the power outage control circuit 30 includes a second switching device Q1, an information prompt device D3, and a relay device U2, a first end of the second switching device Q1 is connected to the controller 40, a second end of the second switching device Q1 is connected to the power supply, a third end of the second switching device Q1 is connected to a first end of the information prompt device D3, a second end of the information prompt device D3 is grounded, a first end of a coil of the relay device U2 is connected to a second end of the information prompt device D3, a second end of the coil of the relay device U2 is grounded, a first switching contact of the relay device U2 is connected to the external power supply, a second switching contact of the relay device U2 is used for connecting to a first end of the heating device, and a second end of the heating device is connected to the external power supply.
In the embodiment, the external power source is a household power source, wherein the first switch contact of the relay device U2 is specifically connected to the live line L, and the second end of the heating device is specifically connected to the neutral line N. When there is leakage current in the water in the heating box, the power-off control circuit 30 not only cuts off the connection between the heating device and the external power supply, but also outputs an information prompt signal through the information prompt device D3 to inform the user, so that the user can know the leakage state of the electric heating device.
When no current leakage occurs in the heating box, taking the example that the leakage detecting circuit 20 includes the first diode D1, the second diode D2 and the first switching device U1, at this time, the signal output by the second end of the light receiver of the first switching device U1 received by the controller 40 is a low level signal, under the action of the low level signal, the controller 40 outputs a control signal to control the second switching device Q1 to be in an off state, at this time, the information prompting device D3 is not powered on, and accordingly, no prompting signal is output to inform the user. And because the relay device U2 does not have an electric signal applied, the first switch contact and the second switch contact are in a communicated state, and at the moment, an external power supply supplies power for the heating device through the form of the first switch contact, the second switch contact and the heating device, so that normal water heating operation is realized.
When the magnetic induction coil 10 generates an induced electromotive force, the third terminal of the first switching device U1 will output a high level (i.e., the leakage signal), and after receiving the high level signal, the controller 40 will generate a power-off control signal to control the second switching device Q1 to be turned on, at this time, the power signal at the second terminal of the second switching device Q1 flows into the information prompt device D3, and the information prompt device D3 sends an information prompt signal to notify the user of the leakage occurring at this time. Meanwhile, the power supply signal flows into the first end of the coil of the relay device U2 from the second end of the information prompt device D3 to energize the coil of the relay device U2, and based on the electromagnetic induction principle, the coil generates a magnetic field to adsorb the armature iron between the first switch contact and the second switch contact, so that the first switch contact and the second switch contact are disconnected, the connection between the heating device and an external power supply is disconnected, and the electric heating device is powered off and stops working.
It should be noted that the specific types of the second switching device Q1 and the relay device U2 are not exclusive, and in one embodiment, when the controller 40 is not disposed between the leakage detection circuit 20 and the power-off control circuit 30, the second switching device Q1 may be a high-level conducting type second switching device Q1, and when the second end of the light receiver of the first switching device U1 outputs a high level, the second switching device Q1 may be directly controlled to be closed, so as to implement the leakage indication and the power-off control of the heating device. In another embodiment, when the controller 40 is disposed between the leakage detecting circuit 20 and the power-off control circuit 30, the second switching device Q1 may be a second switching device Q1 of a high-level conducting type or a low-level conducting type, and when the third terminal of the first switching device U1 outputs a high level, the controller 40 outputs a power-off control signal of a type matched with the selected type of the second switching device Q1 to control the second switching device Q1 to close, so as to implement the leakage indication and the power-off control of the heating device. The relay device U2 can be realized by a normally closed relay, and under the condition of no electrification, a first switch contact and a second switch contact of the normally closed relay are in a communicated state, so that continuous power supply of a heating device can be realized, and water heating is realized.
Likewise, the type of the message prompting device D3 is not exclusive, and in one embodiment, it may be an audible alarm and/or a signal light, etc. as long as it can output different signals to inform the user when powered. Further, in one embodiment, a light emitting diode may be used as the information prompt device D3.
Referring to fig. 7, in an embodiment, the power-off control circuit 30 further includes a fifth resistor R5, a fifth resistor R6, and a seventh resistor R7, the controller 40 is connected to the first end of the second switching device Q1 through the fifth resistor R5, the second end of the information prompt device D3 is connected to the first end of the fifth resistor R6 and the first end of the seventh resistor R7, the second end of the fifth resistor R6 is grounded, and the second end of the seventh resistor R7 is connected to the first end of the coil of the relay device U2.
Specifically, in the embodiment, a fifth resistor R5 is provided between the first end of the second switching device Q1 and the controller 40, a fifth resistor R6 is provided between the second end of the information prompt device D3 and the ground, and a seventh resistor R7 is provided between the second end of the information prompt device D3 and the relay device U2, so that the operational reliability of the power failure control circuit 30 can be effectively improved through the current limiting function of the fifth resistor R5, the fifth resistor R6 and the seventh resistor R7.
Further, referring to fig. 7, in an embodiment, the power cut-off control circuit 30 further includes a third diode D4, an anode of the third diode D4 is connected to the second end of the coil of the relay device U2, and a cathode of the third diode D4 is connected to the first end of the coil of the relay device U2 and the second end of the seventh resistor R7.
Specifically, in the solution of this embodiment, the third diode D4 is disposed between the first end and the second end of the coil of the relay device U2, and the third diode D4 has a bleeding function, so that the operational reliability of the power failure control circuit 30 can be further improved.
In the electric leakage detection system, the magnetic induction coil 10 is arranged in the heating box body for storing water and heating the stored water, when current leaks to the heating box body, the magnetic induction coil 10 can induce the magnetic field intensity change in the heating box body, the magnetic field in the water is converted into electric energy through electromagnetic induction, and the electric energy is detected by the electric leakage detection circuit 20 connected with the electric leakage detection circuit. The leakage detecting circuit 20 generates a leakage signal according to the detected induced electromotive force, controls the leakage detecting circuit 40 to generate a power-off control signal according to the leakage signal, and transmits the power-off control signal to the power-off control circuit 30, thereby finally operating the power-off control circuit 30 disposed between the external power supply and the heating device to cut off the connection between the external power supply and the heating device. By the scheme, whether current leakage exists in the heating box body can be directly detected by using the magnetic induction coil 10, the operation of the heating device is directly stopped under the condition of electric leakage, the leaked current can be prevented from being directly sprayed to a user from a water outlet of the heating box body, and the use safety of electric heating equipment such as an electric water heater is effectively ensured.
An electric water heater comprises the electric leakage detection system.
Specifically, the electric heating device of the present embodiment is specifically an electric water heater, and the specific structure of the electric leakage detecting system is as shown in the above embodiments and the attached drawings,
according to the scheme of the embodiment, for the electric water heater, the magnetic induction coil 10 is directly arranged in the heating box body used for storing water and heating water, and under the condition that the heating box body generates electric leakage, the electric water is directly induced by the magnetic induction coil 10. According to the electromagnetic induction principle, the magnetic induction coil 10 converts the magnetic field abrupt change caused by the current leakage into an induced electromotive force, so that the induced electromotive force can be detected by the leakage detection circuit 20.
It is to be understood that the specific types of the leakage detecting circuit 20 and the power-off control circuit 30 are not exclusive, and the power-off control of the heating device may be implemented by the power-off control circuit 30 as long as the induced electromotive force generated by the magnetic induction coil 10 is detected and the state of the magnetic induction coil 10 is finally notified to the power-off control circuit 30.
It should be noted that the position of the magnetic induction coil 10 in the heating cabinet is not exclusive, as long as it can generate induced electromotive force in time when current leakage occurs inside the heating cabinet. In an embodiment, taking the application of the electrical leakage detection system in an electric water heater as an example, please refer to fig. 2, in which an induction coil is disposed around a heating rod and a magnesium rod for protecting the heating rod, and then two ports of the induction coil are led out respectively and connected to the electrical leakage detection circuit 20. In another embodiment, please refer to fig. 3, it is also possible to design the magnetic induction coil 10 around the water outlet, and then to separately draw out two ports of the induction coil to connect to the leakage detecting circuit 20.
In the water heater, the magnetic induction coil 10 is arranged in the heating box body used for storing water and heating the stored water, when current leaks to the heating box body, the magnetic induction coil 10 can induce the magnetic field intensity change in the heating box body, the magnetic field in the water is converted into electric energy through electromagnetic induction, and the electric energy is detected by the electric leakage detection circuit 20 connected with the electric energy. The leakage detecting circuit 20 generates a leakage signal according to the detected induced electromotive force, and the controller 40 generates a power-off control signal according to the leakage signal and transmits the power-off control signal to the power-off control circuit 30, thereby finally operating the power-off control circuit 30 provided between the external power supply and the heating device to cut off the connection between the external power supply and the heating device. By the scheme, whether current leakage exists in the heating box body can be directly detected by using the magnetic induction coil 10, the operation of the heating device is directly stopped under the condition of electric leakage, the leaked current can be prevented from being directly sprayed to a user from a water outlet of the heating box body, and the use safety of electric heating equipment such as an electric water heater is effectively ensured.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An electrical leakage detection system, comprising:
the magnetic induction coil is arranged in the heating box body and used for generating induced electromotive force when current leaks into water in the heating box body;
the leakage detection circuit is connected with the first end of the magnetic induction coil and the second end of the magnetic induction coil and used for generating a leakage signal according to the induced electromotive force when the magnetic induction coil generates the induced electromotive force;
the controller is connected with the electric leakage detection circuit and used for generating a power-off control signal according to the electric leakage signal;
and the power-off control circuit is connected with the controller, arranged between the external power supply and the heating device and used for cutting off the connection between the heating device and the external power supply when receiving the power-off control signal output by the controller.
2. The leakage detection system of claim 1, wherein the leakage detection circuit comprises a first diode, a second diode and a first switch device, an anode of the first diode is connected to the first end of the magnetic induction coil, a cathode of the first diode is connected to the first end of the first switch device, an anode of the second diode is connected to the second end of the magnetic induction coil, a cathode of the second diode is connected to the first end of the first switch device, a second end of the first switch device is connected to a power supply, and a third end of the first switch device is connected to the controller.
3. An electrical leakage detection system according to claim 2, wherein the first switching device is an optocoupler device.
4. The electrical leakage detection system of claim 2, wherein the electrical leakage detection circuit further comprises a first resistor, a second resistor, a third resistor and a fourth resistor, a first terminal of the first resistor is connected to the cathode of the first diode and the cathode of the second diode, a second terminal of the first resistor is connected to the first terminal of the second resistor and the first terminal of the first switching device, a second terminal of the second resistor is grounded, a first terminal of the third resistor is connected to the third terminal of the first switching device and the first terminal of the fourth resistor, a second terminal of the third resistor is grounded, and a second terminal of the fourth resistor is connected to the controller.
5. The electrical leakage detection system according to claim 4, wherein the electrical leakage detection circuit further comprises a first capacitor and a second capacitor, a first terminal of the first capacitor is connected to the second terminal of the first resistor, a second terminal of the first capacitor is connected to ground, a first terminal of the second capacitor is connected to the first terminal of the first capacitor and the first terminal of the second resistor, and a second terminal of the second capacitor is connected to the second terminal of the first capacitor and the second terminal of the second resistor.
6. The leakage detection system according to any one of claims 1 to 5, wherein the power-off control circuit includes a second switching device, an information prompting device, and a relay device, a first end of the second switching device is connected to the controller, a second end of the second switching device is connected to the power supply, a third end of the second switching device is connected to the first end of the information prompting device, a second end of the information prompting device is grounded, a first end of a coil of the relay device is connected to the second end of the information prompting device, a second end of the coil of the relay device is grounded, a first switch contact of the relay device is connected to an external power supply, a second switch contact of the relay device is used for connecting to a first end of the heating device, and a second end of the heating device is connected to the external power supply.
7. The electrical leakage detection system of claim 6, wherein the power-off control circuit further comprises a fifth resistor, a sixth resistor, and a seventh resistor, the controller is connected to the first end of the second switching device through the fifth resistor, the second end of the information prompting device is connected to the first end of the sixth resistor and the first end of the seventh resistor, the second end of the sixth resistor is grounded, and the second end of the seventh resistor is connected to the first end of the coil of the relay device.
8. The electrical leakage detection system of claim 7, wherein the power-off control circuit further comprises a third diode, an anode of the third diode is connected to the second end of the coil of the relay device, and a cathode of the third diode is connected to the first end of the coil of the relay device and the second end of the seventh resistor.
9. An electrical leakage detection system according to claim 6, wherein the information prompting device is a light emitting diode.
10. An electric water heater comprising an electric leakage detection system according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120833704.2U CN214746454U (en) | 2021-04-22 | 2021-04-22 | Electric leakage detection system and electric water heater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120833704.2U CN214746454U (en) | 2021-04-22 | 2021-04-22 | Electric leakage detection system and electric water heater |
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| CN214746454U true CN214746454U (en) | 2021-11-16 |
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| CN202120833704.2U Active CN214746454U (en) | 2021-04-22 | 2021-04-22 | Electric leakage detection system and electric water heater |
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