CN218939039U - Intelligent doorbell circuit and intelligent doorbell system - Google Patents
Intelligent doorbell circuit and intelligent doorbell system Download PDFInfo
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- CN218939039U CN218939039U CN202222957942.1U CN202222957942U CN218939039U CN 218939039 U CN218939039 U CN 218939039U CN 202222957942 U CN202222957942 U CN 202222957942U CN 218939039 U CN218939039 U CN 218939039U
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Abstract
The utility model discloses an intelligent doorbell circuit and an intelligent doorbell system, wherein the intelligent doorbell circuit comprises an alternating current power supply, a mechanical doorbell, a short circuit control unit, an intelligent doorbell unit, a self-recovery unit and a power supply circuit; the alternating current power supply comprises a first alternating current end and a second alternating current end, the short circuit control unit comprises a control end and two connecting ends, the mechanical doorbell is connected between the first alternating current end and one connecting end in series, the second alternating current end is electrically connected with the other connecting end, the short circuit control unit controls the two connecting ends to be short-circuited or disconnected according to the level signal of the control end, the intelligent doorbell unit is electrically connected with the control end and is used for outputting corresponding level signals to the control end according to doorbell key signals, the self-recovery unit is connected with the mechanical doorbell in parallel, the power supply circuit comprises a power supply unit, and the power supply unit outputs voltage to supply power to the short circuit control unit and the intelligent doorbell unit. According to the technical scheme, the working stability of the mechanical doorbell is improved.
Description
Technical Field
The utility model relates to the field of doorbell control circuits, in particular to an intelligent doorbell circuit and an intelligent doorbell system.
Background
The doorbell is almost every requisite product of family, and traditional doorbell scheme comprises mechanical doorbell and doorbell button, and wherein, the doorbell button sets up outside the door, and mechanical bell sets up in the door, and mechanical doorbell establishes ties between alternating current power supply's both ends with the doorbell button, and the doorbell button is in normally open state, when pressing the doorbell button, then the circuit switches on, and alternating current power supply gives mechanical bell power supply, sends the bell and reminds.
When upgrading and reforming into intelligent doorbell system (e.g. WiFi intelligent doorbell) to traditional bell doorbell, if in the control loop with intelligent doorbell direct series connection access traditional doorbell, replace original doorbell button, then intelligent doorbell and mechanical doorbell are the series connection, and intelligent doorbell can appear under-voltage or voltage instability to alternating current power supply's voltage divider, and mechanical doorbell can not normally stabilize the work.
Disclosure of Invention
The utility model provides an intelligent doorbell circuit, which aims to ensure that a mechanical doorbell in an intelligent doorbell system can work normally and stably.
In order to achieve the above purpose, the intelligent doorbell circuit provided by the utility model comprises an alternating current power supply, a mechanical doorbell, a short circuit control unit, an intelligent doorbell unit, a self-recovery unit and a power supply circuit, wherein:
the alternating current power supply comprises a first alternating current end and a second alternating current end;
the short circuit control unit comprises a control end, a first connecting end and a second connecting end, the mechanical doorbell is connected in series between the first alternating current end and the first connecting end, the second alternating current end is electrically connected with the second connecting end, and the short circuit control unit controls the first connecting end and the second connecting end to be in short circuit or disconnected according to a level signal of the control end;
the intelligent doorbell unit is electrically connected with the control end and is used for outputting corresponding level signals to the control end according to doorbell key signals;
the self-recovery unit is connected with the mechanical doorbell in parallel; and
the power supply circuit comprises a power supply unit, and the power supply unit outputs voltage to supply power to the short circuit control unit and the intelligent doorbell unit.
In some embodiments, the smart doorbell circuit further comprises a power conversion unit, wherein the power conversion unit comprises a direct current output end and two input ends, one input end is electrically connected with the first connection end, the other input end is electrically connected with the second connection end, and the power conversion unit converts alternating current voltage input by the two input ends into direct current voltage and outputs the direct current voltage from the direct current output end;
the power supply circuit further comprises a power supply management unit, the power supply unit comprises an electric storage device, the direct current output end and the charging and discharging end of the electric storage device are electrically connected with the power supply management unit, the power supply management unit controls the charging and discharging of the electric storage device, and the short circuit control unit and the intelligent doorbell unit are powered by output voltage.
In some embodiments, the power conversion unit further includes a rectifying device, two input terminals of the rectifying device are two input terminals of the power conversion unit, and an output terminal of the rectifying device is a dc output terminal of the power conversion unit.
In some embodiments, the self-healing unit includes a self-healing fuse connected in parallel with the mechanical doorbell.
In some embodiments, the ac power source includes a transformer, and two output terminals of the transformer are a first ac terminal and a second ac terminal of the ac power source, respectively.
In some embodiments, the short circuit control unit comprises a first switching optical and an optical coupler, wherein:
the first switching tube comprises two conducting ends and a triggering end, one conducting end of the first switching tube is a second connecting end of the short circuit control unit, and the other conducting end of the first switching tube is electrically connected with the first connecting end of the short circuit control unit;
the anode of the primary of the optical coupler is electrically connected with the power supply management unit, the cathode of the primary of the optical coupler is the control end of the short circuit control unit, one conducting end of the secondary of the optical coupler is electrically connected with the first connecting end of the short circuit control unit, and the other conducting end of the secondary of the optical coupler is electrically connected with the triggering end of the first switching tube.
In some embodiments, the short circuit control unit further comprises a first current limiting element connected in series between a conducting end of the optocoupler secondary and a first connection end of the short circuit control unit.
In some embodiments, the short circuit control unit further includes a second current limiting element, one end of the second current limiting element is electrically connected to the power supply circuit, and the other end of the second current limiting element is electrically connected to the anode of the optocoupler primary.
The utility model also provides an intelligent doorbell system, which comprises the intelligent doorbell circuit.
In some embodiments, the smart doorbell unit comprises a host device for installation indoors and a key device for installation outdoors, the key device being in wireless communication connection with the host device.
According to the technical scheme of the intelligent doorbell circuit, the short circuit control unit is used for receiving the level signals input by the intelligent doorbell unit, and controls the short circuit of the two connecting ends according to the corresponding level signals so as to trigger the self-recovery units connected in parallel to the two ends of the mechanical doorbell to be disconnected, so that alternating current passes through the mechanical doorbell, and the mechanical doorbell rings. Compared with the scheme that the intelligent doorbell is directly connected into the traditional doorbell control loop in series in the prior art, the intelligent doorbell circuit provided by the utility model can not cause under-voltage or unstable voltage of the mechanical doorbell during operation, and improves the working stability of the mechanical doorbell.
Drawings
FIG. 1 is a schematic diagram of the connection of modules in an embodiment of a smart doorbell circuit according to the present utility model;
fig. 2 is a schematic circuit diagram of an embodiment of a smart doorbell circuit according to the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the 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 be within the scope of the utility model.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
It will also be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
The utility model provides an intelligent doorbell circuit which is mainly used for upgrading and reforming a traditional bell doorbell.
Referring to fig. 1, in the present embodiment, the smart doorbell circuit includes an ac power supply 60, a mechanical doorbell 11, a short circuit control unit 20, a smart doorbell unit 323, a self-recovery unit 112, and a power supply circuit 30, wherein:
the AC power supply 60 includes a first AC terminal AC-L and a second AC terminal AC-N;
the short circuit control unit 20 comprises a control end 202, a first connecting end 203 and a second connecting end 204, the mechanical doorbell 11 is connected in series between the first alternating current end AC-L and the first connecting end 203, the second alternating current end AC-N is electrically connected with the second connecting end 204, and the short circuit control unit 20 controls the short circuit or disconnection of the first connecting end 203 and the second connecting end 204 according to the level signal of the control end 202;
the intelligent doorbell unit 323 is electrically connected to the control terminal 202, and is configured to output a corresponding level signal to the control terminal 202 according to a doorbell key signal;
the self-recovery unit 112 is connected in parallel with the mechanical doorbell 11; and
the power supply circuit 30 includes a power supply unit 350, and the power supply unit 350 outputs a voltage to supply power to the short circuit control unit 20 and the smart doorbell unit 323. In the present embodiment, only the low level signal is taken as an example of the level signal output from the smart doorbell unit 323. Of course, in other embodiments, the level signal may be a high level signal. In this embodiment, the intelligent doorbell unit 323 may be an intelligent doorbell with a visual function, or an intelligent doorbell with a voice dialogue function, or the like.
The theory of operation of intelligent doorbell circuit of this embodiment does: the power supply unit 60 outputs a voltage to supply power to the smart doorbell unit 323 and the short circuit control unit 20, when the smart doorbell unit 323 receives a signal of an outdoor button press, a low level signal (for example, a low level signal for a preset duration (for example, 3 seconds) is output to the control terminal 202 of the short circuit control unit 20, the short circuit control unit 20 controls the first connection terminal 203 and the second connection terminal 204 thereof to be shorted, after the short circuit, a current flowing through the self-recovery unit 112 increases, exceeds an overcurrent threshold, the self-recovery unit 112 is disconnected (or a resistance value increases to be equivalent to an open state), and the current passes through the mechanical doorbell 11, so that the mechanical doorbell 11 rings.
When the outdoor key is not pressed, the intelligent doorbell control unit 323 keeps outputting a high level to the control terminal 202 of the short-circuit control unit 20, the short-circuit control unit 20 controls the first connection terminal 203 and the second connection terminal 204 to keep a disconnected state, current does not pass through the mechanical doorbell 11, and the mechanical doorbell 11 does not work.
The intelligent doorbell circuit of this embodiment adopts the short circuit control unit 20 to be used for receiving the level signal that intelligent doorbell unit 323 input, and short circuit control unit 20 controls first link 203 and second link 204 short circuit according to corresponding level signal to trigger the work of the self-recovery unit 112 that connects in parallel at mechanical doorbell 11 both ends, make the electric current only pass through from mechanical doorbell 11, and mechanical doorbell 11 then rings the bell work. Compared with the scheme that the intelligent doorbell is directly connected into the traditional doorbell control loop in series in the prior art, the intelligent doorbell circuit of the embodiment can not cause the undervoltage or the unstable voltage of the mechanical doorbell 11 during operation, and the working stability of the mechanical doorbell 11 is improved.
Referring to fig. 2, in the present embodiment, the smart doorbell circuit 30 further includes a power conversion unit 40, the power conversion unit 40 includes two input terminals (respectively denoted as a first input terminal 42 and another input terminal 43) of a dc output terminal 41, the first input terminal 42 is electrically connected to the first connection terminal 203, the other input terminal 43 is electrically connected to the second connection terminal 204, and the power conversion unit 40 converts the ac voltage input by the first input terminal 42 and the second input terminal 43 into the dc voltage to be output from the dc output terminal 41;
the power supply circuit 30 further includes a power supply management unit 340, the power supply unit 350 includes an electric storage device 351, the dc output terminal 41 and a charge-discharge terminal 352 of the electric storage device 351 are electrically connected with the power supply management unit 340, the power supply management unit 340 controls charge-discharge of the electric storage device 351, and the output voltage supplies power to the short-circuit control unit and the smart doorbell unit.
The theory of operation of intelligent doorbell circuit of this embodiment does: the power conversion unit 40 converts the ac power input from the first input terminal 42 and the second input terminal 43 into dc power, and outputs the dc power to the power management unit 340 through the dc output terminal 41 of the power conversion unit 40, the power management unit 340 is configured to manage power supply of the intelligent doorbell unit 323 and charge and discharge the power storage device 351, and if the power management unit 340 detects that the power conversion unit 40 has no voltage input, the power management unit 340 switches to the power storage device 351 to supply power to the intelligent doorbell unit 323.
The intelligent doorbell circuit of this embodiment is used for supplying power to the intelligent doorbell unit 323 through the direct current that the power supply management unit 340 was used for outputting the power conversion unit 40 to and charge and discharge for the power storage device 351, and the power supply management unit 340 detects that the power conversion unit 40 does not have voltage input, then switches power storage device 351 and supplies power for the intelligent doorbell unit 323, and the guarantee has the continuous stable working power supply to supply the work of intelligent doorbell unit 323, has promoted job stabilization nature.
Referring to fig. 2, in the present embodiment, the power conversion unit 40 further includes a rectifying device 404, two input terminals (respectively denoted as a first input terminal 405 and a second input terminal 407) of the rectifying device 404 are respectively a first input terminal 42 and a second input terminal 43 of the power conversion unit 40, and an output terminal 406 of the rectifying device 404 is a dc output terminal 41 of the power conversion unit 40.
The intelligent doorbell circuit of the present embodiment employs the rectifying device 404 to convert the ac power into a dc power (e.g., 5V) with stable voltage, supplies power to the intelligent doorbell unit 323 through the dc output terminal 41, and charges the battery through the power supply management unit 340, thereby providing a stable working power supply for the intelligent doorbell unit 323 and the power storage device 351.
Referring to fig. 2, in the present embodiment, the self-recovery unit 112 includes a self-recovery fuse 113, and the self-recovery fuse 113 is connected in parallel with the mechanical doorbell 11.
The theory of operation of intelligent doorbell circuit of this embodiment does: the self-recovery fuse 113 is in a conducting state under normal load, and current can pass through the self-recovery fuse 113 preferentially so as to supply power to the power conversion unit 40 and the intelligent doorbell unit 323 which are connected at the later stage to work; when the current passing through the self-recovery fuse 113 exceeds a certain value, the self-recovery fuse 113 heats up greatly to raise the temperature, so that the resistance is raised greatly to be equivalent to an open state, and when the current in the loop returns to normal, the temperature of the self-recovery fuse 113 is lowered, the resistance is restored, and the current passes through the self-recovery fuse 113 again.
The intelligent doorbell circuit of this embodiment adopts the parallelly connected mode of self-recovery fuse 113 and mechanical doorbell 11, and the electric current then can pass through in the self-recovery fuse 113 preferentially, and the electric current that power conversion unit 40 and intelligent doorbell unit 323 during operation produced can not lead to mechanical doorbell 11 shake even send out abnormal sound, has guaranteed mechanical doorbell 11's job stabilization nature.
Referring to fig. 2, in the present embodiment, the AC power source 60 includes a transformer 61, two output terminals of the transformer 61 are a first AC terminal AC-L and a second AC terminal AC-N of the AC power source 60, respectively, and an input of the transformer 61 can be connected to a mains supply or other AC power.
The intelligent doorbell circuit of this embodiment adopts transformer 61 to be used for changing the mains supply into the required power of intelligent doorbell circuit work, upgrades the work of reforming into intelligent doorbell system in traditional bell doorbell, and intelligent doorbell circuit can the operation work by the direct connection mains supply, does not need to purchase transformer unit in addition, very convenient.
Referring to fig. 2, in the present embodiment, the short circuit control unit 20 includes a first open tube 210 and an optocoupler 205, where:
the first switch tube 210 includes two conducting ends and a trigger end 211, one conducting end of the first switch tube is the second connecting end 204 of the short circuit control unit 20, and the other conducting end 212 of the first switch tube 210 is electrically connected to the first connecting end 203 of the short circuit control unit 20;
the anode 206 of the primary of the optocoupler 205 is electrically connected to the power supply management unit 340, the cathode 207 of the primary of the optocoupler 205 is the control end 202 of the short-circuit control unit 20, the conducting end 208 of the secondary of the optocoupler is electrically connected to the first connection end 203 of the short-circuit control unit 20, and the other conducting end 209 of the secondary of the optocoupler is electrically connected to the trigger end 211 of the first switching tube 210. In this embodiment, the first switching tube 210 may be a triac. Of course, in some embodiments, the first switching tube 210 may also be a switching tube having the same functional role.
The theory of operation of intelligent doorbell circuit of this embodiment does: the cathode 207 of the primary of the optocoupler 205 receives the low-level signal input by the intelligent doorbell unit 323, and the light emitting diode of the primary of the optocoupler 205 is turned on to emit light, so that the silicon controlled rectifier of the secondary of the optocoupler 205 is driven to be turned on, and thus the trigger end 211 of the first open tube 210 electrically connected with the other conducting end 209 of the secondary of the optocoupler 205 has a level signal, and the first switch tube 210 is turned on, so that the first connecting end 203 and the second connecting end 204 of the short-circuit control unit 20 are short-circuited.
The intelligent doorbell circuit of this embodiment adopts the optocoupler 205 to control the conduction of one conduction end and the other conduction end 212 of the first switch tube 210, so that the first connection end 203 and the second connection end 204 of the short circuit control unit 20 are short-circuited, and the two circuits with different power supply levels are effectively electrically isolated, thereby playing a good role in protection. In addition, the first connection end 203 and the second connection end 204 of the short circuit control unit 20 are separately controlled to be short-circuited or disconnected through the first switching tube 210, so that the risk of breakdown and burning of peripheral components is avoided.
Referring to fig. 2, in the present embodiment, the short-circuit control unit 20 further includes a first current limiting element R1, and the first current limiting element R1 is connected in series between a conducting end 208 of the secondary side of the optocoupler 205 and the first connection end 203 of the short-circuit control unit 20. In this embodiment, the first current limiting element R1 may be a resistor. Of course, in other embodiments, other flow restricting elements having the same functional effect are also possible.
The intelligent doorbell circuit of the present embodiment is connected in series between a second conducting end 208 of the optocoupler 205 and the first connecting end 203 of the short-circuit control unit 20 through the first current limiting element R1, and is used for limiting the current passing through the second conducting end 208 of the optocoupler 205 and the second conducting end 209 of the secondary, so as to avoid the internal burnout of the optocoupler 205 due to the excessive current, and improve the safety.
Referring to fig. 2, in the present embodiment, the short circuit control unit 20 further includes a second current limiting element R2, one end of the second current limiting element R2 is electrically connected to the power supply circuit 30, and the other end of the second current limiting element R2 is electrically connected to the primary anode 206 of the optocoupler 205.
The intelligent doorbell circuit of the embodiment adopts the second current limiting element R2 to be connected in series between the primary anode 206 of the optocoupler 205 and the power supply circuit 30, so as to limit the current passing through the primary anode 206 and the primary cathode 207 of the optocoupler 205, thereby avoiding the internal of the optocoupler 205 from being burnt by excessive current and improving the safety.
The utility model further provides an intelligent doorbell system.
In this embodiment, the intelligent doorbell system includes an intelligent doorbell circuit, and the specific circuit structure of the intelligent doorbell circuit refers to the above embodiment, and since the intelligent doorbell system adopts all the technical schemes implemented in the above manner, the intelligent doorbell system has at least all the beneficial effects brought by the technical schemes of the above embodiment, and will not be described in detail herein.
In some embodiments, the smart doorbell unit 323 comprises a host device for installation indoors and a key device for installation outdoors, the key device being in wireless communication with the host device. In this embodiment, the wireless communication may be WIFI communication. Of course, in other embodiments, the wireless communication may be other wireless communication methods such as bluetooth, which is not limited herein.
The intelligent doorbell system of this embodiment theory of operation does: the visitor presses the keys of the outdoor key device, the key device and the indoor host device send signals of the key pressing to the indoor host device through WiFi wireless communication, and the indoor host device makes corresponding reactions according to the received key signals.
The intelligent doorbell system of this embodiment adopts outdoor button device and indoor host computer device wireless communication's mode, and indoor host computer device can receive the signal that outdoor button was pressed to make corresponding reaction according to the button signal, with the warning user that is located indoor, fine avoided the loaded down with trivial details wiring construction of wired communication mode to and the use of wire rod, greatly reduced the cost.
The above description of the preferred embodiments of the present utility model should not be taken as limiting the scope of the utility model, but rather should be understood to cover all modifications, variations and adaptations of the present utility model using its general principles and the following detailed description and the accompanying drawings, or the direct/indirect application of the present utility model to other relevant arts and technologies.
Claims (10)
1. An intelligent doorbell circuit, comprising:
the alternating current power supply comprises a first alternating current end and a second alternating current end;
a mechanical doorbell;
the short circuit control unit comprises a control end, a first connecting end and a second connecting end, wherein the mechanical doorbell is connected in series between the first alternating current end and the first connecting end, the second alternating current end is electrically connected with the second connecting end, and the short circuit control unit controls the first connecting end and the second connecting end to be in short circuit or disconnected according to a level signal of the control end;
the intelligent doorbell unit is electrically connected with the control end and is used for outputting corresponding level signals to the control end according to doorbell key signals;
the self-recovery unit is connected with the mechanical doorbell in parallel; and
the power supply circuit comprises a power supply unit, and the power supply unit outputs voltage to supply power to the short circuit control unit and the intelligent doorbell unit.
2. The intelligent doorbell circuit of claim 1, further comprising a power conversion unit, wherein the power conversion unit comprises a dc output terminal and two input terminals, one of the input terminals is electrically connected to the first connection terminal, the other input terminal is electrically connected to the second connection terminal, and the power conversion unit converts an ac voltage input from the two input terminals into a dc voltage and outputs the dc voltage from the dc output terminal;
the power supply circuit further comprises a power supply management unit, the power supply unit comprises an electric storage device, the direct current output end and the charging and discharging end of the electric storage device are electrically connected with the power supply management unit, the power supply management unit controls the charging and discharging of the electric storage device, and the short circuit control unit and the intelligent doorbell unit are powered by output voltage.
3. The intelligent doorbell circuit of claim 2, wherein the power conversion unit further comprises a rectifying device, wherein two inputs of the rectifying device are two inputs of the power conversion unit, and wherein an output of the rectifying device is a dc output of the power conversion unit.
4. The smart doorbell circuit of claim 1, wherein the self-healing unit comprises a self-healing fuse that is connected in parallel with the mechanical doorbell.
5. The intelligent doorbell circuit of claim 1, wherein the ac power source comprises a transformer, the two output terminals of the transformer being a first ac terminal, a second ac terminal, respectively, of the ac power source.
6. The smart doorbell circuit of claim 2, wherein the short circuit control unit comprises:
the first switching tube comprises two conducting ends and a triggering end, one conducting end of the first switching tube is a second connecting end of the short circuit control unit, and the other conducting end of the first switching tube is electrically connected with the first connecting end of the short circuit control unit;
the anode of the primary of the optical coupler is electrically connected with the power supply management unit, the cathode of the primary of the optical coupler is the control end of the short circuit control unit, one conducting end of the secondary of the optical coupler is electrically connected with the first connecting end of the short circuit control unit, and the other conducting end of the secondary of the optical coupler is electrically connected with the triggering end of the first switching tube.
7. The intelligent doorbell circuit of claim 6, wherein the short circuit control unit further comprises a first current limiting element connected in series between a conductive terminal of the optocoupler secondary and a first connection terminal of the short circuit control unit.
8. The intelligent doorbell circuit according to claim 6, wherein the short circuit control unit further comprises a second current limiting element, one end of the second current limiting element is electrically connected to the power supply circuit, and the other end of the second current limiting element is electrically connected to the anode of the optocoupler primary.
9. A smart doorbell system comprising the smart doorbell circuit of any one of claims 1 to 8.
10. The smart doorbell system of claim 9, wherein the smart doorbell unit comprises a host device for installation indoors and a key device for installation outdoors, the key device being in wireless communication with the host device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222957942.1U CN218939039U (en) | 2022-11-03 | 2022-11-03 | Intelligent doorbell circuit and intelligent doorbell system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222957942.1U CN218939039U (en) | 2022-11-03 | 2022-11-03 | Intelligent doorbell circuit and intelligent doorbell system |
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| Publication Number | Publication Date |
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| CN218939039U true CN218939039U (en) | 2023-04-28 |
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| CN202222957942.1U Active CN218939039U (en) | 2022-11-03 | 2022-11-03 | Intelligent doorbell circuit and intelligent doorbell system |
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| Country | Link |
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| CN (1) | CN218939039U (en) |
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2022
- 2022-11-03 CN CN202222957942.1U patent/CN218939039U/en active Active
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