CN219285429U - Induction detection device and equipment with metal shell - Google Patents
Induction detection device and equipment with metal shell Download PDFInfo
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- CN219285429U CN219285429U CN202223124374.3U CN202223124374U CN219285429U CN 219285429 U CN219285429 U CN 219285429U CN 202223124374 U CN202223124374 U CN 202223124374U CN 219285429 U CN219285429 U CN 219285429U
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- 230000006698 induction Effects 0.000 title claims abstract description 113
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- 238000013459 approach Methods 0.000 abstract description 15
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- 238000002955 isolation Methods 0.000 description 6
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- 238000013461 design Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 241001465754 Metazoa Species 0.000 description 2
- 206010053615 Thermal burn Diseases 0.000 description 2
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- 238000000034 method Methods 0.000 description 2
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- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
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- 239000007924 injection Substances 0.000 description 1
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Abstract
The utility model provides an induction detection device and equipment with a metal shell, wherein the device comprises: the metal shell comprises an insulating interlayer, a metal induction component and a controller, wherein the insulating interlayer is arranged between the metal shell and the metal induction component; the controller is connected with the metal induction component, transmits a detection signal with set frequency to the metal induction component, and collects induction voltage of the metal induction component; and the controller determines a target object induction detection result of the metal shell according to the relation between the induction voltage and the preset voltage. Therefore, when a target object such as a person approaches the metal induction component, the capacitance value between the metal induction component and the ground can be increased, so that the induction voltage value is reduced, whether the target object appears at the metal shell or not can be accurately detected by utilizing the relation between the collected induction voltage and the preset voltage, the human body approach induction function of the metal shell product is realized, and the user experience of the metal shell product is improved.
Description
Technical Field
The utility model relates to the technical field of household appliances, in particular to an induction detection device and equipment with a metal shell.
Background
Because of the electromagnetic shielding effect of metal, most household electrical appliance products with human body proximity sensing function are products with non-metal shells or have no other metal parts near the proximity sensing position. However, in order to avoid the high-temperature scald caused by the careless touching of the human body to the metal grille at the air outlet, the proximity sensing function of the human body needs to be added at the air outlet, but no better solution is available at present due to the metal material of the metal grille.
Disclosure of Invention
In view of the above, the embodiment of the utility model provides an induction detection device and a device with a metal shell, so as to solve the problem that the product with the metal shell in the prior art is difficult to realize the human body approaching induction function.
According to a first aspect, an embodiment of the present utility model provides an induction detection apparatus for use in a device having a metal casing, the apparatus comprising: an insulating interlayer, a metal sensing component and a controller, wherein,
the insulating interlayer is arranged between the metal shell and the metal induction component;
the controller is connected with the metal induction component, transmits a detection signal with set frequency to the metal induction component, and collects induction voltage of the metal induction component;
and the controller determines a target object induction detection result of the metal shell according to the relation between the induction voltage and the preset voltage.
Optionally, the induction detection device further comprises: and the power supply is connected with the controller.
Optionally, the induction detection device further includes: and the input end of the driving circuit is connected with the output end of the controller, the output end of the driving circuit is connected with the load of the equipment, and the controller drives the equipment to work through the driving circuit.
Optionally, the power supply is an isolated power supply, and the driving circuit is an isolated driving circuit.
Optionally, the power supply is a non-isolated power supply, the driving circuit is a non-isolated driving circuit, and a protection impedance is arranged between the controller and the metal induction component.
Optionally, the distance between the metal casing and the metal sensing part is determined by a target object detection distance of the metal casing.
Optionally, the controller includes: the phase difference between the first and second phase difference signals,
the induction voltage of the metal induction component is input into the first input end of the comparator, the second input end of the comparator is externally connected with the preset voltage, and the output end of the comparator outputs the target object induction detection result of the metal shell.
Optionally, the insulating interlayer is fixed on the metal shell, and the metal induction component is fixed on the insulating interlayer; the metal housing is connected to ground.
Optionally, the distance between the metal shell and the metal sensing part ranges from 1mm to 100mm.
According to a second aspect, an embodiment of the present utility model provides an apparatus having a metal housing, the apparatus comprising: the inductive sensory apparatus of the first aspect and any optional embodiments thereof.
Optionally, the device is an electric heater, and the metal induction component is arranged at an air outlet of the electric heater.
The technical scheme of the utility model has the following advantages:
1. the induction detection device provided by the embodiment of the utility model comprises: for application to an apparatus having a metal housing, the device comprising: the metal shell comprises an insulating interlayer, a metal induction component and a controller, wherein the insulating interlayer is arranged between the metal shell and the metal induction component; the controller is connected with the metal induction component, transmits a detection signal with set frequency to the metal induction component, and collects induction voltage of the metal induction component; and the controller determines a target object induction detection result of the metal shell according to the relation between the induction voltage and the preset voltage. Therefore, the insulation between the metal induction component and the metal shell is realized by utilizing the insulation interlayer, the interference of the metal shell to the induction detection result is avoided, the detection signal with fixed frequency is transmitted to the metal induction component by utilizing the controller, when a target object such as a person approaches the metal induction component, the induction voltage value is reduced, and therefore, whether the target object appears at the metal shell or not can be accurately detected by utilizing the acquired relation between the induction voltage and the preset voltage, the human body approach induction function of the metal shell product is realized, and the user experience of the metal shell product is improved.
2. The embodiment of the utility model provides equipment with a metal shell, and the equipment is provided with an induction detection device provided by another embodiment of the utility model. Therefore, the insulation between the metal induction component and the metal shell is realized by utilizing the insulation interlayer, the interference of the metal shell to the induction detection result is avoided, the detection signal with fixed frequency is transmitted to the metal induction component by utilizing the controller, when a target object such as a person approaches the metal induction component, the induction voltage value is reduced, and therefore, whether the target object appears at the metal shell or not can be accurately detected by utilizing the acquired relation between the induction voltage and the preset voltage, the human body approach induction function of the metal shell product is realized, and the user experience of the metal shell product is improved.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an apparatus having a metal housing according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a specific structure of an induction detection device according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of another embodiment of an induction detecting device according to the present utility model;
fig. 4 is a schematic diagram showing a specific operation process of the apparatus with a metal housing according to the embodiment of the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
The technical features of the different embodiments of the utility model described below may be combined with one another as long as they do not conflict with one another.
Because of the electromagnetic shielding effect of metal, most household electrical appliance products with human body proximity sensing function are products with non-metal shells or have no other metal parts near the proximity sensing position. However, in order to avoid the high-temperature scald caused by the careless touching of the human body to the metal grille at the air outlet, the proximity sensing function of the human body needs to be added at the air outlet, but no better solution is available at present due to the metal material of the metal grille.
In view of the above problems, an embodiment of the present utility model provides an induction detection apparatus applied to a device having a metal housing as shown in fig. 1, as shown in fig. 1-2, the induction detection apparatus including: an insulating spacer 102, a metal sensing part 101 and a controller (not shown in the figure), wherein the insulating spacer 102 is disposed between the metal casing 103 and the metal sensing part 101; the controller is connected with the metal induction part 101, and transmits a detection signal with set frequency to the metal induction part 101 and acquires induction voltage of the metal induction part 101; the controller determines the target object sensing detection result of the metal shell 103 according to the relation between the sensing voltage and the preset voltage.
The metal sensing component 101 may be a metal sensing wire, a metal sensing coil, a metal sensing mesh enclosure, a metal sensing panel, or the like, and the specific shape and area of the metal sensing component may be flexibly set according to the actual sensing detection requirement, which is not limited in the present utility model. The insulating barrier 102 may be a barrier made of an insulating material such as a high temperature resistant plastic grid.
Specifically, in the embodiment of the present utility model, the above-mentioned device with a metal casing is taken as an example for describing an electric heater, where the electric heater has functions of air supply, heating, humidification or air filtration, and the metal induction component 101 is disposed at an air outlet of the electric heater, so as to implement a human body induction function at the air outlet of the electric heater, so that a human body can be conveniently found at the air outlet in time, the working mode of the electric heater can be adjusted in time, the use experience of a user can be improved, and scalding during a heating mode can be avoided. In practical applications, the device may also be other products with a metal housing 103, such as: the utility model is not limited to electric heating fans and the like.
Specifically, in one embodiment, the controller includes: the induced voltage of the metal induction component 101 is input into a first input end of the comparator, a second input end of the comparator is externally connected with a preset voltage, and an output end of the comparator outputs a target object induction detection result of the metal shell 103. In practical application, the comparator can be integrated in a control unit such as an MCU of the device, so that a human body proximity sensing function is realized by means of logic processing of hardware, the configuration requirement on a controller is reduced, and the cost of a product is further reduced.
According to the induction detection device provided by the embodiment of the utility model, the electromagnetic field is formed at the metal induction component in a mode of transmitting the detection signal with the fixed frequency to the metal induction component by utilizing the controller, the corresponding induction voltage value is acquired at the metal induction component by utilizing the capacitance value formed between the metal induction component and the ground, when a target object such as a person approaches the metal induction component, the capacitance value between the metal induction component and the ground is increased, so that the induction voltage value is reduced, and whether the target object appears at the metal shell or not can be accurately detected by utilizing the relation between the acquired induction voltage and the corresponding induction voltage value, namely the preset voltage when no person approaches, so that the human body approach induction function of the metal shell product is realized, and the user experience of the metal shell product is improved.
For example, an electromagnetic field may be formed at the metal sensing part 101 by generating a detection signal of a fixed frequency to the metal sensing part 101 through an experiment by the MCU, transmitting the detection signal of the fixed frequency to the metal sensing part 101 by means of the controller, and an induced voltage of the metal sensing part 101 when no person is around the metal sensing part 101 may be collected at the metal sensing part 101 by using a capacitance value formed between the metal sensing part 101 and the ground, and an average value or a minimum value of the induced voltage may be determined as the preset voltage through a plurality of experiments. Then when a human body or an animal approaches the metal shell 103 of the product and approaches the metal induction component 101, the capacitance value between the metal induction component 101 and the ground is increased, so that the induction voltage value is reduced, and whether the human body or the animal approaches the electric heater can be determined by comparing the preset voltage with the induction voltage detected in real time by using the comparator, so that the working mode of the electric heater can be flexibly adjusted, for example: stopping heating avoids scalding and the like, and improves the use experience of a user on the product.
Specifically, in an embodiment, the controller is a control unit of the apparatus. For example, MCU of the electric heater, etc., thus the controller is not required to be additionally arranged, and the induction detection function can be realized only by using the controller of the equipment, thereby saving the production cost.
Specifically, in one embodiment, as shown in fig. 1, the insulating spacer 102 is fixed on the metal casing 103, and the metal sensing component 101 is fixed on the insulating spacer 102. Illustratively, a layer of high temperature resistant plastic grille is arranged on an air outlet metal grille of the electric heater, and then the metal induction coil is nested on the plastic grille. The metal induction component 101 and the metal shell 103 are fixed together through the insulating layer, so that the induction detection function of the product can be realized under the condition that the volume of the product is not obviously increased, and the insulating interlayer 102 is arranged to prevent the metal shell 103 from generating signal interference on the metal induction component 101. In addition, the metal housing 103 is connected to ground to ensure safety during use of the product. In practical applications, as shown in fig. 2-3, the metal housing 103 may be connected to the power ground GND of the MCU, and the reference ground for signal sampling also plays a role in shielding interference.
Specifically, in an embodiment, the induction detection device provided by the embodiment of the utility model further includes: and the power supply is connected with the controller. In practical application, the power supply can also be the power supply of the equipment, so that the equipment cost is further reduced by sharing the power supply. Further, the induction detection device of the equipment with the metal shell provided by the embodiment of the utility model further comprises a driving circuit, wherein the input end of the driving circuit is connected with the output end of the controller, the output end of the driving circuit is connected with the load of the equipment, and the controller drives the equipment to work through the driving circuit. The output end of the driving circuit is connected with loads such as a heating body and a motor of the electric heater.
Illustratively, as shown in fig. 2, the power supply is an isolated power supply, and the driving circuit is an isolated driving circuit. Specifically, the isolation power supply may be a safety isolation transformer, or a flyback switching power supply that satisfies safety isolation, and the isolation driving circuit is a driving circuit with a safety isolation function, and the specific circuit structure may be implemented by referring to the design of the related driving circuit in the prior art, which is not described herein.
Illustratively, as shown in fig. 3, the power supply is a non-isolated power supply, the driving circuit is a non-isolated driving circuit, a protection impedance, such as a Y capacitor, is provided between the controller and the metal sensing part 101, and a protection impedance is also provided between the MCU and the metal housing 103. The magnitude of the protective impedance can be adjusted, so that the induction detection effect and the interference signal shielding effect can achieve good effects, and the safety specification requirements can be met. In practical applications, the non-isolated power supply may be a buck switching power supply, a buck-boost switching power supply, etc., and the non-isolated driving circuit is a driving circuit without a safety isolation function, and the specific circuit structure may be implemented by referring to the design of the related driving circuit in the prior art, which is not described herein.
In practical application, the power supply is connected with the mains supply to supply power to weak current loads such as an MCU, a display and a buzzer of the electric heater, and the driving circuit is controlled by the MCU to drive the strong current loads such as a heating body and a motor to work.
Specifically, in an embodiment, the distance between the metal housing 103 and the metal sensing part 101 is determined by the target object detection distance of the metal housing 103. In practical application, the processing of combining hardware circuit PCB wiring, software filtering algorithm and the like is needed, and the debugging is needed to meet the requirements of detection distance and the EMC anti-interference experiments such as injection current, EFT and the like. In general, the farther the metal sensing part 101 is from the metal case 103, the farther the detection distance of the target object is, but the poorer the corresponding anti-interference capability is. In practical application, the distance between the metal shell 103 and the metal sensing part 101 ranges from 1mm to 100mm, so that the human body approach sensing effect and the interference signal shielding effect can reach a good effect within the distance range, the requirements of the scalding prevention detection distance of most products such as electric heaters can be met, and the use experience of users is improved.
In addition, in practical applications, the shape and size of the metal sensing component 101 also affect the detection distance, such as: the larger the area is, the farther the sensing distance is, so after the distance between the metal sensing part 101 and the metal shell 103 is adjusted, the detection distance can be adjusted by changing the shape and the size of the metal sensing part 101, so that the requirements of different products in different application scenes can be met, and the flexibility of product design can be improved.
The induction detection device can ensure that the metal shell product effectively and reliably realizes the human body approach induction function; the detection distance of human proximity induction can be flexibly adjusted by adjusting the safety distance between the metal induction part 101 and the metal shell 103; in addition, the power supply and load driving problems caused by the safety regulation problem of the metal shell product are solved through the configuration of different power supplies and driving circuits, the safe power supply and safety detection are realized, and the safety of the product is ensured.
The working process of the induction detection device provided by the embodiment of the utility model will be described below with reference to a specific application example.
As shown in fig. 4, when the metal sensing part is not close to the air outlet of the electric heater, the metal sensing part detects the reference voltage U0 at this time; when the human body approaches the air outlet of the electric heater, the metal induction component detects the voltage U0-delta U at the moment. When the electric heater works in the air supply mode, the set threshold value is U1, if the detection result meets U0-delta U not more than U1, namely, the position of a human body close to the air outlet is detected, the air supply gear is increased, and the air quantity and the air supply distance are improved. Can be set according to actual requirements. When the electric heater works in a heating mode, the set threshold value is U2, if the detection result meets U0-delta U not more than U2, namely, the position of a human body close to the air outlet is detected, the heating body is cut off or the power is reduced, and high-temperature scalding is prevented. U1 and U2 are both values smaller than or equal to U0, and can be the same or different and can be configured according to actual requirements. In practical application, the threshold value set by the air supply mode is higher, and the sensing distance is longer, so that the heating effect is enhanced when people exist, and the use experience of users is improved; the heating mode is lower in set threshold value, the sensing distance is closer, the closer the human body distance is, the smaller the detected voltage value is, and therefore close-range scalding is avoided.
Although embodiments of the present utility model have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations are within the scope of the utility model as defined by the appended claims.
Claims (10)
1. An induction detection device for use in an apparatus having a metal housing, said device comprising: an insulating interlayer, a metal sensing component and a controller, wherein,
the insulating interlayer is arranged between the metal shell and the metal induction component;
the controller is connected with the metal induction component, transmits a detection signal with set frequency to the metal induction component, and collects induction voltage of the metal induction component;
the controller determines a target object induction detection result of the metal shell according to the relation between the induction voltage and a preset voltage;
the controller includes: the phase difference between the first and second phase difference signals,
the induction voltage of the metal induction component is input into the first input end of the comparator, the second input end of the comparator is externally connected with the preset voltage, and the output end of the comparator outputs the target object induction detection result of the metal shell.
2. The inductive detection device of claim 1, further comprising: and the power supply is connected with the controller.
3. The inductive detection device of claim 2, further comprising: and the input end of the driving circuit is connected with the output end of the controller, the output end of the driving circuit is connected with the load of the equipment, and the controller drives the equipment to work through the driving circuit.
4. The inductive detection device of claim 3, wherein said power supply is an isolated power supply and said drive circuit is an isolated drive circuit.
5. The inductive detection device of claim 3, wherein the power supply is a non-isolated power supply, the drive circuit is a non-isolated drive circuit, and a protection impedance is provided between the controller and the metal inductive component.
6. The inductive detection device of claim 1, wherein a distance between the metal housing and the metal inductive component is determined by a target object detection distance of the metal housing.
7. The inductive detection device of claim 1, wherein,
the insulating interlayer is fixed on the metal shell, and the metal induction component is fixed on the insulating interlayer;
the metal housing is connected to ground.
8. The inductive detection device of claim 6, wherein a distance between said metal housing and said metal inductive component is in the range of 1mm-100mm.
9. An apparatus having a metal housing, the apparatus comprising: an inductive detection device as claimed in any one of claims 1 to 8.
10. The apparatus of claim 9, wherein the apparatus is an electric heater and the metal sensing member is disposed at an outlet of the electric heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223124374.3U CN219285429U (en) | 2022-11-23 | 2022-11-23 | Induction detection device and equipment with metal shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223124374.3U CN219285429U (en) | 2022-11-23 | 2022-11-23 | Induction detection device and equipment with metal shell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219285429U true CN219285429U (en) | 2023-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223124374.3U Active CN219285429U (en) | 2022-11-23 | 2022-11-23 | Induction detection device and equipment with metal shell |
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| Country | Link |
|---|---|
| CN (1) | CN219285429U (en) |
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- 2022-11-23 CN CN202223124374.3U patent/CN219285429U/en active Active
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