Low-power-consumption cabinet door state monitoring system

Abstract

The utility model relates to the technical field of smart home and Internet of Things, and relates to a low-power-consumption cabinet door state monitoring system which comprises a monitoring module and a magnet. The monitoring module is installed on the cabinet body and detects the state of the cabinet door through cooperation of a magnetic reed switch and a magnet, and low-power-consumption door opening and closing monitoring and data transmission are achieved. According to the system, the battery does not supply power in the door closing state, the system enters the low-power-consumption mode in the door opening state, the service life of the battery is remarkably prolonged, and the use convenience of equipment is improved.

Description

Technical Field

[0001] The present application relates to the technical field of smart home and Internet of Things, and in particular to a low-power cabinet door status monitoring system. Background Art

[0002] Existing cabinet door status monitoring technologies mostly use photoelectric sensors to detect the switch status of cabinet doors. However, as active devices, photoelectric sensors have high power consumption, resulting in high overall power consumption of the equipment. In addition, existing cabinet door switch detection products usually use ZIGBEE, Bluetooth and other communication methods for data transmission, and the power consumption of these communication methods is also difficult to reduce to a very low level. When powered by batteries, the battery life is often short and requires frequent battery replacement, which brings great inconvenience to users. Therefore, how to reduce the power consumption of the cabinet door status monitoring system and extend the battery life has become a technical problem that needs to be solved urgently. Utility Model Content

[0003] In order to solve the problems in the background technology, the present application provides a low-power cabinet door status monitoring system.

[0004] The present application provides a low-power cabinet door status monitoring system, which adopts the following technical solutions:

[0005] A low-power cabinet door status monitoring system, comprising a monitoring module and a magnet, wherein the monitoring module is mounted on a cabinet body, and the magnet is mounted on a cabinet door; the monitoring module comprises a reed switch, an MCU control module, a wireless communication module, a power module, and an energy storage module; the reed switch is a single-pole double-throw switch controlled by a magnetic field, comprising a first pin, a second pin, and a third pin; the third pin is connected to a third input pin of the MCU control module;

[0006] When the cabinet door is in the open state, the first pin and the second pin of the reed switch are in the on state, the second pin and the third pin are in the off state, the power module is connected with the energy storage module, the power module charges the energy storage module, and the level of the third pin is at a low level. After the MCU control module detects that the input of the third input pin is at a low level, it triggers the wireless communication module to send a cabinet door opening state signal;

[0007] When the cabinet door is in a closed state, the first pin and the second pin of the reed switch are in a disconnected state, the second pin and pin 3 are in a conductive state, the power supply module is disconnected from the energy storage module, the energy storage module starts supplying power, and the level of the third pin is at a high level. After the MCU control module detects that the input of the third input pin and SWICH is at a high level, it triggers the wireless communication module to send a cabinet door closed state signal.

[0008] Preferably, the wireless communication module includes a wireless transceiver chip and a signal modulation circuit, which is used to send the cabinet door closing state signal and the cabinet door opening state signal to the corresponding receiving end using a 433MHz wireless signal.

[0009] Preferably, the wireless communication module includes six pins; the signal modulation circuit includes a first inductor, which is respectively connected to the fifth pin and the sixth pin of the wireless communication module; the fifth pin is also connected in series with the third capacitor, the second inductor, the third inductor, the fourth inductor, and the antenna in sequence; the fourth capacitor and the fifth capacitor are connected in series and then connected in parallel with the third inductor. Preferably, the power module includes a power supply and a current limiting resistor;

[0010] The first pin of the reed switch is connected to the positive electrode of the power supply through the current limiting resistor.

[0011] Preferably, the monitoring module further includes: an electric coupling circuit; the electric coupling circuit includes a first capacitor, a second capacitor, an eleventh capacitor, and a twelfth capacitor connected in parallel;

[0012] The third pin of the reed switch is connected to a parallel terminal of the coupling circuit via a second resistor to generate a reference voltage; the second pin of the reed switch is connected to the other parallel terminal of the coupling circuit and then grounded.

[0013] Preferably, the energy storage module comprises a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, and a thirteenth capacitor connected in parallel in sequence, and a first resistor is further connected in series between the tenth capacitor and the thirteenth capacitor;

[0014] One of the parallel ends is connected to the second pin of the reed switch; the other parallel end is grounded.

[0015] Preferably, the power supply is a 2032 button battery.

[0016] Preferably, an indicator light module is also included, and the MCU control module is further used to control the switch of the indicator light module according to the detected state of the reed switch.

[0017] Preferably, the reed switch can be replaced by a mechanical switch with a single-pole double-throw function;

[0018] When the cabinet door is in a closed state, the mechanical switch is squeezed by the cabinet door and the cabinet body to change the closed state.

[0019] In summary, the present application includes at least one of the following beneficial technical effects:

[0020] 1. This application uses a reed switch to detect the open and closed state of the cabinet door. Compared with the prior art using a photoelectric sensor, it significantly reduces power consumption, extends battery life, and reduces the frequency of battery replacement by users;

[0021] 2. By stopping the power supply after detecting that the reed switch is closed and starting the power supply after detecting that the reed switch is open, intelligent control of the power supply is achieved, further reducing system power consumption;

[0022] 3. The wireless communication module adopts a specific circuit structure, which can achieve stable signal transmission with low power consumption;

[0023] 4. The specific circuit structure design of the reed switch is reasonable, which can improve the accuracy and stability of detection;

[0024] 5. The current consumption in the open state is less than 1uA, achieving extremely low power consumption level;

[0025] 6. By adding an indicator light module, the opening and closing status of the cabinet door can be intuitively displayed, improving user convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of a low-power cabinet door status monitoring system provided in one embodiment of the present application.

[0027] Figure 2 It is a schematic diagram of a specific circuit structure of a monitoring module provided in one embodiment of the present application. DETAILED DESCRIPTION

[0028] The low power consumption cabinet door status monitoring system provided by the embodiment of the present application is as follows: Figure 1 As shown, it includes a monitoring module and a magnet. The monitoring module is installed on the cabinet body, and the magnet is installed on the cabinet door. The monitoring module is the core part of the system, responsible for detecting the opening and closing status of the cabinet door and sending corresponding signals.

[0029] Specifically, the monitoring module includes a reed switch, an MCU control module, a wireless communication module, a power module, and an energy storage module. The reed switch is used to detect the open and closed state of the cabinet door, and its working principle is based on the change of the magnetic field. The reed switch, also known as the reed switch, is a contactless electronic switch that uses a magnetic field to control the on and off of the circuit. The reed switch generally contains two very thin metal reeds, usually made of stainless steel, which are sealed in a glass tube to form a vacuum or inert gas environment. The two reeds remain separated and do not conduct current when there is no magnetic field. When the external magnetic field approaches the reed switch, if the magnetic field strength is sufficient, the two reeds will be magnetized and attracted together to form a closed circuit. When the magnetic field disappears, the reed returns to its original state due to its own elasticity, disconnects the contact, and the circuit is disconnected. This switching action is instantaneous, there is no physical contact wear, and it has the characteristics of fast response and long life. This example uses a reed switch with a single-pole double-throw function.

[0030] In this embodiment, when the cabinet door is closed, the magnet on the cabinet door approaches the reed switch, and the magnetic field causes the 1-2 pins of the reed switch to close and the 2-3 pins to disconnect; when the cabinet door is opened, the magnet moves away from the reed switch, causing the 1-2 pins to disconnect and the 2-3 pins to close.

[0031] The MCU control module is connected to the reed switch, wireless communication module, energy storage module and power module respectively. The reed switch controls the power supply switch of the power module in different states, and can make the connection pins of the MCU in different level states, so that the MCU control module can receive the state signal of the reed switch and control the wireless communication module to send the corresponding cabinet door state signal according to the state of the signal.

[0032] After detecting that the 1-2 pins of the reed switch are closed, the MCU control module triggers the wireless communication module to send a door closed status signal and stops the power supply at the same time. This design can significantly reduce the power consumption of the system when the door is closed, and even achieve zero power consumption.

[0033] When the 1-2 pin of the reed switch is detected to be disconnected, the MCU control module triggers the wireless communication module to send a door open status signal and turns on the power supply at the same time. In this way, the system can work normally with lower power consumption when the door is open.

[0034] In order to realize the corresponding control function, the circuit structure of the corresponding module can be refined as follows Figure 2 shown.

[0035] The power module includes a power supply U3 and a current limiting resistor R3; a reed switch SW1 has multiple connection terminals, namely pin 1, pin 2, and pin 3.

[0036] The first pin 1 of the reed switch is connected to the positive electrode of the power supply U3 through the current limiting resistor R3, and the third pin 3 is connected to the negative electrode of the power supply U3 through the second resistor R2. The third pin 3 is connected to the third input pin of the MCU control module.

[0037] The monitoring module also includes: an electric coupling circuit; the electric coupling circuit includes a first capacitor C1, a second capacitor C2, an eleventh capacitor C11, and a twelfth capacitor C12 connected in parallel;

[0038] The third pin 3 of the reed switch is connected to one parallel end of the coupling circuit through a second resistor R2 and then to ground; the second pin 2 is connected to the other parallel end of the coupling circuit to generate a reference voltage VCC to power various components in the entire system.

[0039] These capacitors can play roles such as voltage stabilization and filtering to ensure the stability of power supply output.

[0040] The energy storage module includes a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, and a thirteenth capacitor C13 connected in parallel in sequence, and a first resistor R1 is also connected in series between the tenth capacitor C10 and the thirteenth capacitor C13; one of the parallel ends is connected to the pin 2 of the reed switch; and the other parallel end is grounded.

[0041] When the cabinet door is in the open state, pins 1 and 2 of the reed switch are in the on state, and pins 2 and 3 are in the off state, the power module is connected to the energy storage module, and the power module charges the energy storage module. At the same time, the level of pin 3 is low. After the MCU control module detects that the input of the third input pin is low, it triggers the wireless communication module to send a cabinet door opening state signal;

[0042] When the cabinet door is in a closed state, pins 1 and 2 of the reed switch are in a disconnected state, pins 2 and 3 are in a conducting state, the power supply module is disconnected from the energy storage module, the energy storage module starts supplying power, and at the same time, the level of the third pin becomes a high level. After the MCU control module detects that the input of the third input pin is a high level, it triggers the wireless communication module to send a cabinet door closed state signal.

[0043] Among them, SW2 is a reset switch, and the reset signal RST is input to pin 1 of the MCU control module U2.

[0044] It is worth mentioning that the current consumption of the system is 0 when the door is closed, thanks to the clever design of the reed switch and MCU control module. When the door is open, the current consumption of the system is also less than 1uA, mainly due to the low power design of the wireless communication module and the power module. Specifically, the wireless communication module adopts an efficient signal modulation method to reduce the power consumption during signal transmission; while the power module achieves the purpose of reducing power consumption while ensuring performance through reasonable circuit layout and component selection.

[0045] In addition, the present application also preferably uses a 2032 button battery as the power source U3. This battery has the advantages of small size, large capacity, and long service life, and is very suitable for the low-power cabinet door status monitoring system in the present application.

[0046] The wireless communication module includes a wireless transceiver chip U1 (whose model can be CMT2119A-ESR) and a signal modulation circuit. The module uses a 433MHz wireless signal to send the cabinet door closed state signal and the cabinet door open state signal to the corresponding receiving end. The 433MHz frequency band has the advantages of long transmission distance and low power consumption, and is suitable for the low-power cabinet door status monitoring system in this application.

[0047] The signal modulation circuit includes multiple electronic components, such as inductors, capacitors, etc., which form a circuit capable of stably transmitting signals through a specific connection method. As shown in the figure, the signal modulation circuit includes a first inductor L1, which is connected to pins 5 and 6 of the wireless communication module respectively; pin 5 is also connected in series with the third capacitor C3, the second inductor L2, the third inductor L3, the fourth inductor L4, and the antenna U4 (model AN1603-433) in sequence; the fourth capacitor C4 and the fifth capacitor C5 are connected in series and then connected in parallel with the third inductor L3.

[0048] On the basis of the above structure, an indicator light module can be added. The indicator light module is connected to the MCU control module and is used to control the switch of the indicator light according to the detected state of the reed switch. The specific structure can be an LED lamp connected in series with a resistor.

[0049] Specifically, when the reed switch is closed (i.e. the cabinet door is closed), the indicator light goes out; when the reed switch is open (i.e. the cabinet door is open), the indicator light comes on. In this way, users can intuitively check the status of the indicator light to determine whether the cabinet door is open or closed, which improves the convenience of use. At the same time, the power consumption of the indicator light module has also been carefully designed to ensure that it will not significantly affect the overall power consumption of the system during normal operation.

[0050] The selection of specific devices and circuit connection relationships can be referred to Figure 2 It should be noted that triggering a level change of a corresponding output pin by a level change of an input pin is a basic function of the MCU controller. The specific implementation method can be realized by a technician in this field according to the needs of the actual scene, without the need for any innovative application of software programs. Figure 2 The programming port shown can set the corresponding control signal.

[0051] In other embodiments, the reed switch can be replaced by a mechanical switch with a single-pole double-throw function; the mechanical switch has a protruding button, and when the cabinet door is closed, the connection state can be changed by the compression of the cabinet door and the cabinet body, thereby achieving the same effect as the reed switch.

Claims

1. A low-power cabinet door status monitoring system, characterized in that: It includes a monitoring module and a magnet, wherein the monitoring module is installed on the cabinet body, and the magnet is installed on the cabinet door; the monitoring module includes a reed switch, an MCU control module, a wireless communication module, a power module, and an energy storage module; the reed switch is a single-pole double-throw switch controlled by a magnetic field, including a first pin, a second pin, and a third pin; the third pin is connected to the third input pin of the MCU control module; When the cabinet door is in the open state, the first pin and the second pin of the reed switch are in the on state, the second pin and the third pin are in the off state, the power module is connected with the energy storage module, the power module charges the energy storage module, and the level of the third pin is at a low level. After the MCU control module detects that the input of the third input pin is at a low level, it triggers the wireless communication module to send a cabinet door opening state signal; When the cabinet door is in a closed state, the first pin and the second pin of the reed switch are in a disconnected state, the second pin and pin 3 are in a conductive state, the power supply module is disconnected from the energy storage module, the energy storage module starts to supply power, and the level of the third pin is a high level. After the MCU control module detects the input high level of the third input pin, it triggers the wireless communication module to send a cabinet door closed state signal.

2. The low power consumption cabinet door status monitoring system according to claim 1, characterized in that: The wireless communication module includes a wireless transceiver chip and a signal modulation circuit, and is used to send the cabinet door closing state signal and the cabinet door opening state signal to the corresponding receiving end using a 433 MHz wireless signal.

3. The low power consumption cabinet door status monitoring system according to claim 2, characterized in that: The wireless communication module includes six pins; The signal modulation circuit includes a first inductor, which is respectively connected to the fifth pin and the sixth pin of the wireless communication module; the fifth pin is also connected in series with the third capacitor, the second inductor, the third inductor, the fourth inductor, and the antenna in sequence; the fourth capacitor and the fifth capacitor are connected in series and then connected in parallel with the third inductor.

4. The low power consumption cabinet door status monitoring system according to claim 1, characterized in that: The power module includes a power supply and a current limiting resistor; The first pin of the reed switch is connected to the positive electrode of the power supply through the current limiting resistor.

5. The low power consumption cabinet door status monitoring system according to claim 4, characterized in that: The monitoring module further includes: an electric coupling circuit; the electric coupling circuit includes a first capacitor, a second capacitor, an eleventh capacitor, and a twelfth capacitor connected in parallel; The third pin of the reed switch is connected to a parallel end of the coupling circuit through a second resistor and then grounded; the second pin of the reed switch is connected to the other parallel end of the coupling circuit, that is, the positive end of the power supply.

6. The low power consumption cabinet door status monitoring system according to claim 1, characterized in that: The energy storage module includes a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, and a thirteenth capacitor connected in parallel in sequence, and a first resistor is further connected in series between the tenth capacitor and the thirteenth capacitor; One of the parallel ends is connected to the second pin of the reed switch; the other parallel end is grounded.

7. The low power consumption cabinet door status monitoring system according to claim 4, characterized in that: The power supply is a 2032 button battery.

8. The low power consumption cabinet door status monitoring system according to claim 1, characterized in that: It also includes an indicator light module, and the MCU control module is also used to control the switch of the indicator light module according to the detected state of the reed switch.

9. The low power consumption cabinet door status monitoring system according to claim 1, characterized in that: The reed switch can be replaced by a mechanical switch with a single-pole double-throw function; When the cabinet door is in a closed state, the mechanical switch is squeezed by the cabinet door and the cabinet body to change the closed state.

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