Narrowband Internet of Things Terminals and Systems

Abstract

The present invention relates to the technical field of narrowband Internet of Things, and discloses a narrowband Internet of Things terminal and system. The narrowband Internet of Things terminal comprises: a narrowband Internet of Things control module, which is used to send a first control signal when determining that a DC-DC voltage conversion module is in a step-down working state; send a second control signal when determining that the DC-DC voltage conversion module is in a non-step-down working state; a switching switch module, which is used to receive a power signal; and when receiving the first control signal, connect the narrowband Internet of Things control module to transmit the power signal to the narrowband Internet of Things control module; when receiving the second control signal, connect the DC-DC voltage conversion module to transmit the power signal to the DC-DC voltage conversion module; and the DC-DC voltage conversion module is used to transmit the adjusted power signal to the narrowband Internet of Things control module when receiving the power signal. The present invention reduces the power consumption of the narrowband Internet of Things terminal and improves the battery life.

Description

Technical Field

[0001] The present invention relates to the technical field of narrowband Internet of Things, and in particular to a narrowband Internet of Things terminal and system. Background Art

[0002] With the rise of cellular IoT, cellular IoT terminals based on NB-IoT (Narrow Band Internet of Things) technology are gradually being widely used. This type of narrowband IoT terminal was designed with the principle of reducing system complexity and power consumption costs and extending the service life of the equipment. However, in many application scenarios, battery life is an issue that must be deeply considered in terminal design. For narrowband IoT terminals, their power consumption is at the uA level, so the design of all active devices will affect the uA level power consumption of the entire device.

[0003] At present, narrowband IoT terminals are gradually being used in household products such as refrigerators, washing machines, air conditioners, etc. for product tracking. In actual applications, narrowband IoT terminals generally use stable household power supplies or home appliance modules for power supply. However, in the logistics process and warehousing process, narrowband IoT terminals need to be powered by additional batteries to meet the reporting of data and location information. Figure 1 As shown in the figure, the power outputted by the battery VBAT is adjusted by the DC-DC converter chip in the narrowband IoT terminal and then outputted to the narrowband IoT microprocessor chip, thereby realizing power supply for the narrowband IoT terminal. In this power supply process, the current is lost during the transmission process, which increases the power consumption of the narrowband IoT terminal. Therefore, how to reduce the power loss of the narrowband IoT terminal during the power supply process to improve the battery life is an urgent problem to be solved. Summary of the invention

[0004] The object of the present invention is to provide a narrowband Internet of Things terminal and system, which can reduce the power loss of the narrowband Internet of Things terminal during power supply to improve the battery life.

[0005] In order to solve the above technical problems, the present invention provides a narrowband Internet of Things terminal, comprising:

[0006] A narrowband Internet of Things control module, used for detecting the working state of the DC-DC voltage conversion module; and when determining that the working state of the DC-DC voltage conversion module is a step-down working state, sending a first control signal to the switching switch module; when determining that the working state of the DC-DC voltage conversion module is a non-step-down working state, sending a second control signal to the switching switch module;

[0007] The switching switch module is used to receive a power signal; and when receiving the first control signal, connect to the narrowband Internet of Things control module to transmit the power signal to the narrowband Internet of Things control module, thereby providing power for the narrowband Internet of Things control module; and,

[0008] and further configured to connect the DC-DC voltage conversion module to transmit the power signal to the DC-DC voltage conversion module when receiving the second control signal;

[0009] The DC-DC voltage conversion module is used to transmit the power signal to the narrowband Internet of Things control module when receiving the power signal transmitted by the switching switch module, so as to provide power for the narrowband Internet of Things control module.

[0010] As a preferred solution, the narrowband Internet of Things control module is specifically used for:

[0011] detecting the power supply signal;

[0012] When the voltage value of the power signal is within a preset voltage range, determining that the working state of the DC-DC voltage conversion module is the step-down working state, and then sending the first control signal to the switching module;

[0013] When the voltage value of the power signal is not within the preset voltage range, the working state of the DC-DC voltage conversion module is determined to be the non-voltage reduction working state, and then the second control signal is sent to the switching module.

[0014] As a preferred solution, the narrowband Internet of Things control module is also used to send the second control signal to the switching switch module when the power signal is detected for the first time.

[0015] As a preferred solution, the narrowband Internet of Things terminal further includes a voltage divider circuit detection module;

[0016] The voltage divider circuit detection module is used to receive the power signal, divide the power signal, and transmit the divided power signal to the narrowband Internet of Things control module;

[0017] The narrowband Internet of Things control module is also used to determine the voltage value of the power supply signal before voltage division according to the power supply signal after voltage division.

[0018] As a preferred solution, the voltage divider circuit detection module includes a first resistor and a second resistor;

[0019] One end of the first resistor is the input end of the voltage divider circuit detection module, which is used to receive the power supply signal; the other end of the first resistor is connected to one end of the second resistor, and one end of the second resistor is the output end of the voltage divider circuit detection module, which is used to transmit the divided power supply signal to the narrowband Internet of Things control module; the other end of the second resistor is grounded.

[0020] As a preferred solution, the DC-DC voltage conversion module is specifically used to adjust the voltage of the power signal to a preset supply voltage when receiving the power signal transmitted by the switching switch module, and transmit the adjusted power signal to the narrowband Internet of Things control module, thereby providing power for the narrowband Internet of Things control module.

[0021] As a preferred solution, the narrowband Internet of Things control module is a narrowband Internet of Things microprocessor chip.

[0022] As a preferred solution, the DC-DC voltage conversion module is a BOOST type DC-DC converter chip.

[0023] In order to solve the same technical problem, the present invention provides a narrowband Internet of Things system, including a power supply and the above-mentioned narrowband Internet of Things terminal;

[0024] The power supply is used to provide the power signal to the narrowband Internet of Things terminal.

[0025] Compared with the prior art, the present invention provides a narrowband Internet of Things terminal and system, by enabling the narrowband Internet of Things control module to send the first control signal to the switching switch module when determining that the working state of the DC-DC voltage conversion module is the step-down working state, so that the switching switch module is connected to the narrowband Internet of Things control module, so as to directly transmit the power signal to the narrowband Internet of Things control module, thereby providing power for the narrowband Internet of Things control module. At this time, there is no need to power the narrowband Internet of Things control module through the DC-DC voltage conversion module, effectively avoiding the phenomenon of current loss caused by the working efficiency of the DC-DC voltage conversion module when the DC-DC voltage conversion module 30 is in the step-down working state, thereby reducing the power consumption of the narrowband Internet of Things terminal during the power supply process, and thus improving the battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of a narrowband Internet of Things terminal in the prior art;

[0027] Figure 2 It is a schematic diagram of the structure of a narrowband Internet of Things terminal provided by an embodiment of the present invention;

[0028] Figure 3It is a schematic diagram of the structure of another narrowband Internet of Things terminal provided by an embodiment of the present invention.

[0029] Among them, 10, narrowband Internet of Things control module; 20, switching switch module; 30, DC-DC voltage conversion module; 40, power supply; 50, voltage divider circuit detection module. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 2 , is a schematic diagram of the structure of a narrowband Internet of Things terminal provided by an embodiment of the present invention.

[0032] The narrowband Internet of Things terminal provided in the embodiment of the present invention includes a narrowband Internet of Things control module 10, a switching switch module 20 and a DC-DC voltage conversion module 30;

[0033] The narrowband Internet of Things control module 10 is used to detect the working state of the DC-DC voltage conversion module 30; and when it is determined that the working state of the DC-DC voltage conversion module 30 is a step-down working state, send a first control signal to the switching switch module 20; when it is determined that the working state of the DC-DC voltage conversion module 30 is a non-step-down working state, send a second control signal to the switching switch module 20;

[0034] The switching switch module 20 is used to receive a power signal; and when receiving the first control signal, it is connected to the narrowband Internet of Things control module 10 to transmit the power signal to the narrowband Internet of Things control module 10, thereby providing power to the narrowband Internet of Things control module 10; and,

[0035] is also used to connect the DC-DC voltage conversion module 30 when receiving the second control signal, so as to transmit the power signal to the DC-DC voltage conversion module 30;

[0036] The DC-DC voltage conversion module 30 is used to transmit the power signal to the narrowband Internet of Things control module 10 when receiving the power signal transmitted by the switching switch module 20, so as to provide power for the narrowband Internet of Things control module 10.

[0037] Specifically, Figure 2As shown, the input end of the switching switch module 20 is used to be connected to the output end of the power supply 40 to receive the power signal sent by the power supply 40; the control end of the switching switch module 20 is connected to the output end of the narrowband Internet of Things control module 10; the switching switch 20 also has a first output end and a second output end. When the switching switch 20 receives the first control signal, the first output end of the switching switch 20 is connected to the first power end of the narrowband Internet of Things module 10; when the switching switch 20 receives the second control signal, the second output end of the switching switch 20 is connected to the input end of the DC-DC voltage conversion module 30; the output end of the DC-DC voltage conversion module 30 is connected to the second power end of the narrowband Internet of Things control module 10.

[0038] It should be noted that if Figure 1 As shown, only the DC-DC voltage conversion module 30, i.e., the DC-DC converter chip, is used to adjust the power provided by the battery VBAT, and the adjusted power is output to the narrowband Internet of Things microprocessor chip, thereby powering the narrowband Internet of Things terminal. In this power supply process, when the DC-DC converter chip is in the step-down working state, there will be a phenomenon of current loss due to the working efficiency of the DC-DC converter chip, and the higher the input voltage of the DC-DC converter chip, the lower the working efficiency of the DC-DC converter chip, and the greater the current loss, thereby increasing the power consumption of the narrowband Internet of Things terminal during the power supply process.

[0039] In the embodiment of the present invention, when the narrowband Internet of Things control module 10 determines that the working state of the DC-DC voltage conversion module 30 is the step-down working state, the first control signal is sent to the switching switch module 20, so that the switching switch module 20 is connected to the narrowband Internet of Things control module 10, so as to directly transmit the power signal to the narrowband Internet of Things control module 10, thereby providing power for the narrowband Internet of Things control module 10. At this time, there is no need to provide power for the narrowband Internet of Things control module 10 through the DC-DC voltage conversion module 30, which effectively avoids the phenomenon of current loss caused by the working efficiency of the DC-DC voltage conversion module 30 when the DC-DC voltage conversion module 30 is in the step-down working state, thereby reducing the power consumption of the narrowband Internet of Things terminal during the power supply process, thereby improving the battery life.

[0040] In an embodiment of the present invention, the DC-DC voltage conversion module is used to transmit the power signal to the narrowband Internet of Things control module when receiving the power signal transmitted by the switching switch module, so as to provide power for the narrowband Internet of Things control module, specifically:

[0041] The DC-DC voltage conversion module 30 is used to adjust the voltage of the power signal to a preset power supply voltage when receiving the power signal transmitted by the switching switch module 20, and transmit the adjusted power signal to the narrowband Internet of Things control module 10, thereby providing power for the narrowband Internet of Things control module 10.

[0042] In a preferred embodiment, the narrowband Internet of Things control module 10 is used to determine the working state of the DC-DC voltage conversion module 20; and when it is determined that the working state of the DC-DC voltage conversion module 30 is a step-down working state, send a first control signal to the switching switch module 20; when it is determined that the working state of the DC-DC voltage conversion module 30 is a non-step-down working state, send a second control signal to the switching switch module 20, which is specifically manifested as:

[0043] detecting the power supply signal;

[0044] When the voltage value of the power signal is within a preset voltage range, determining that the working state of the DC-DC voltage conversion module 30 is the step-down working state, and sending the first control signal to the switching module 20;

[0045] When the voltage value of the power signal is not within the preset voltage range, the working state of the DC-DC voltage conversion module 30 is determined to be the non-voltage reduction working state, and the second control signal is sent to the switching module 20 .

[0046] Specifically, Figure 2As shown, the detection input end of the narrowband Internet of Things control module 10 is also used to connect with the output end of the power supply 40 to detect the power signal sent by the power supply 40. When the narrowband Internet of Things control module 10 detects that the voltage value of the power signal is within a preset voltage range, it is determined that if the DC-DC voltage conversion module 30 is used to provide power to the narrowband Internet of Things control module 10, the working state of the DC-DC voltage conversion module 30 is the step-down working state, so the first control signal is generated and sent to the switching module 20, so that the first output end of the switching switch module 20 is connected to the first power end of the narrowband Internet of Things control module 10, thereby supplying power to the narrowband Internet of Things control module 10, so that it is not necessary to provide power to the narrowband Internet of Things control module 10 through the DC-DC voltage conversion module 30 at this time. When the narrowband Internet of Things control module 10 detects that the voltage value of the power signal is not within the preset voltage range, it is determined that if the DC-DC voltage conversion module 30 is used to provide power for the narrowband Internet of Things control module 10, the working state of the DC-DC voltage conversion module 30 is the non-step-down working state, and therefore the second control signal is generated and sent to the switching module 20, so that the second output end of the switching switch module 20 is connected to the input end of the DC-DC voltage conversion module 30, thereby realizing that after the DC-DC voltage conversion module 30 adjusts and receives the power signal, the narrowband Internet of Things control module 10 is powered.

[0047] It should be noted that the working state of the DC-DC voltage conversion module 30 includes a step-down working state and a non-step-down working state; wherein the non-step-down working state includes a through state and a boost working state. When the difference between the input voltage VIN of the DC-DC voltage conversion module 30 and the output voltage VOUT of the DC-DC voltage conversion module 30 is greater than 0.5V, the DC-DC voltage conversion module 30 is in the through state; when the difference between the input voltage VIN of the DC-DC voltage conversion module 30 and the output voltage VOUT of the DC-DC voltage conversion module 30 is greater than or equal to 0V and less than or equal to 0.5V, the DC-DC voltage conversion module 30 is in the step-down working state; when the difference between the input voltage VIN of the DC-DC voltage conversion module 30 and the output voltage VOUT of the DC-DC voltage conversion module 30 is less than 0V, the DC-DC voltage conversion module 30 is in the boost working state. It can be understood that in the narrowband Internet of Things terminal of this embodiment, the DC-DC voltage conversion module 30 is connected to the power supply 40 through the switching switch module 20, and the voltage of the power supply signal provided by the power supply 40 is the input voltage of the DC-DC voltage conversion module 30. Therefore, when it is detected that the voltage value of the power supply signal is within the preset voltage range, it can be determined that the working state of the DC-DC voltage conversion module 30 is the step-down working state, and when it is detected that the voltage value of the power supply signal is not within the preset voltage range, it can be determined that the working state of the DC-DC voltage conversion module 30 is the non-step-down working state. In addition, since the output end of the DC-DC voltage conversion module 30 is connected to the second power supply end of the narrowband Internet of Things control module 10, the output voltage of the DC-DC voltage conversion module 30 is the power supply voltage of the narrowband Internet of Things control module 10.

[0048] For the convenience of explanation, the technical solution of the embodiment of the present invention is described below by taking the power supply voltage of the narrowband Internet of Things control module 10 as 3.3V as an example. The power supply voltage of the narrowband Internet of Things control module 10 in the narrowband Internet of Things terminal provided by the present invention is not limited to 3.3V.

[0049] In the embodiment of the present invention, when the NB-IoT control module 10 detects that the voltage value of the power signal is greater than 3.8V, that is, the difference between the input voltage VIN of the DC-DC voltage conversion module 30 and the output voltage VOUT of the DC-DC voltage conversion module 30 is greater than 0.5V, it can be determined that the working state of the DC-DC voltage conversion module 30 is the through state;

[0050] When the narrowband Internet of Things control module 10 detects that the voltage value of the power signal is greater than or equal to 3.3V and less than or equal to 3.8V, that is, the difference between the input voltage VIN of the DC-DC voltage conversion module 30 and the output voltage VOUT of the DC-DC voltage conversion module 30 is greater than or equal to 0V and less than or equal to 0.5V, at this time, the DC-DC voltage conversion module 30 needs to step down the voltage of the power signal to output a voltage of 3.3V to provide to the narrowband Internet of Things control module 10, so it can be determined that the working state of the DC-DC voltage conversion module 30 is the step-down working state;

[0051] When the narrowband Internet of Things control module 10 detects that the voltage value of the power signal is less than 3.3V, that is, the difference between the input voltage VIN of the DC-DC voltage conversion module 30 and the output voltage VOUT of the DC-DC voltage conversion module 30 is less than 0V, at this time, the DC-DC voltage conversion module 30 needs to boost the voltage of the power signal to output a 3.3V voltage to the narrowband Internet of Things control module 10, so it can be determined that the working state of the DC-DC voltage conversion module 30 is the boost working state.

[0052] In a preferred embodiment, in order to ensure that the narrowband Internet of Things control module 10 can start and detect the power signal sent by the power supply 40 to ensure that the state of the DC-DC voltage conversion module 30 can be identified, the narrowband Internet of Things control module 10 in this embodiment is also used to send the second control signal to the switching switch module 20 when the power signal is detected for the first time.

[0053] It can be understood that when the power supply 40 is working and outputs the power signal to the detection end of the narrowband Internet of Things control module 10 for the first time, the narrowband Internet of Things control module 10 detects the power signal sent by the power supply 40 for the first time, and thus generates the second control signal, and sends the control signal to the switching module 20, so that the second output end of the switching switch module 20 is connected to the input end of the DC-DC voltage conversion module 30, thereby transmitting the received power signal to the DC-DC voltage conversion module 30, so as to provide power to the narrowband Internet of Things control module 10 through the DC-DC voltage conversion module 30; at this time, the narrowband Internet of Things control module 10 obtains power, starts and detects the power signal sent by the power supply 40, so as to determine whether the first output end of the switching switch module 20 is finally connected to the first power end of the narrowband Internet of Things control module 10, so as to power the narrowband Internet of Things control module 10, or whether the second output end of the switching switch module 20 is connected to the input end of the DC-DC voltage conversion module 30, so as to power the narrowband Internet of Things control module 10 through the DC-DC voltage conversion module 30.

[0054] like Figure 3 As shown, in a preferred embodiment, the narrowband Internet of Things terminal further includes a voltage divider circuit detection module 50;

[0055] The voltage divider circuit detection module 50 is used to receive the power signal, divide the power signal, and transmit the divided power signal to the NB-IoT control module 10;

[0056] The NB-IoT control module 10 is further configured to determine a voltage value of the power signal before voltage division based on the power signal after voltage division.

[0057] Specifically, the input end of the voltage divider circuit detection module 102 is used to be connected to the output end of the power supply 40 to receive the power signal sent by the power supply 40; the output end of the voltage divider circuit detection module 102 is connected to the detection end of the narrowband Internet of Things control module 101, and is used to transmit the divided power signal to the narrowband Internet of Things control module 10. When the narrowband Internet of Things control module 10 receives the divided power signal, it can determine the voltage value of the power signal before the voltage division according to the divided power signal, so as to detect the power signal sent by the power supply 40; and then when it is determined that the voltage value of the power signal is within the preset voltage range, the first control signal is sent to the switching switch module 20; when it is determined that the voltage value of the power signal is not within the preset voltage range, the second control signal is sent to the switching switch module 20.

[0058] In a preferred embodiment, the voltage divider circuit detection module 50 includes a first resistor R1 and a second resistor R2;

[0059] One end of the first resistor R1 is the input end of the voltage divider circuit detection module 50, which is used to receive the power supply signal; the other end of the first resistor R1 is connected to one end of the second resistor R2, and one end of the second resistor R2 is the output end of the voltage divider circuit detection module 50, which is used to transmit the divided power supply signal to the narrowband Internet of Things control module 10; the other end of the second resistor R2 is grounded.

[0060] In the embodiment of the present invention, by setting the voltage divider circuit detection module 50, the power signal is divided, and the divided power signal is transmitted to the narrowband Internet of Things control module 10, so that the narrowband Internet of Things control module 10 detects the power signal of the power supply 40, which effectively avoids the problem of damage to the narrowband Internet of Things control module 10 due to excessive voltage input to the detection end of the narrowband Internet of Things control module 10, thereby ensuring the normal operation of the narrowband Internet of Things control module 10 and improving the reliability of the narrowband Internet of Things terminal.

[0061] In the embodiment of the present invention, the type of the narrowband Internet of Things control module 10 can be set according to actual usage; preferably, the narrowband Internet of Things control module 10 in this embodiment is a narrowband Internet of Things microprocessor chip.

[0062] In addition, the type of the DC-DC voltage conversion module 30 in this embodiment can be set according to actual usage; preferably, the DC-DC voltage conversion module 30 in this embodiment is a BOOST type DC-DC converter chip;

[0063] The type of the switching switch module 20 in this embodiment can also be set according to actual usage; preferably, the switching switch module 20 in this embodiment is a power switch.

[0064] In the embodiment of the present invention, the working process of the narrowband Internet of Things terminal is specifically as follows: the power supply 40 outputs a power signal to the narrowband Internet of Things terminal, and the switching switch module 20 receives the power signal. When the narrowband Internet of Things control module 10 detects that the voltage value of the power signal is within a preset voltage range and determines that the working state of the DC-DC voltage conversion module 30 is a step-down working state, it generates the first control signal and sends the first control signal to the control end of the switching switch module 20 through its output end; when the switching switch module 20 receives the first control signal, it controls the first output end of the switching switch module 20 to connect to the first power end of the narrowband Internet of Things control module 10, so as to transmit the received power signal to the narrowband Internet of Things control module 10, thereby providing power for the narrowband Internet of Things control module 10. When the narrowband Internet of Things control module 10 detects that the voltage value of the power signal is not within the preset voltage range and determines that the working state of the DC-DC voltage conversion module 30 is the non-step-down working state, it generates the second control signal and sends the second control signal to the control end of the switching switch module 20 through its output end; when the switching switch module 20 receives the second control signal, it controls the second output end of the switching switch module 20 to connect to the input end of the DC-DC voltage conversion module 30 to transmit the received power signal to the DC-DC voltage conversion module 30, and the DC-DC voltage conversion module 30 adjusts the voltage of the power signal to the preset power supply voltage, and transmits the adjusted power signal to the narrowband Internet of Things control module 10, thereby providing power for the narrowband Internet of Things control module 10.

[0065] In order to solve the same technical problem, an embodiment of the present invention further provides a narrowband Internet of Things system, including a power supply 40 and the above-mentioned narrowband Internet of Things terminal;

[0066] The power supply 40 is used to provide the power signal to the narrowband Internet of Things terminal.

[0067] In summary, the present invention provides a narrowband Internet of Things terminal and system, by enabling the narrowband Internet of Things control module 10 to send the first control signal to the switching switch module 20 when determining that the working state of the DC-DC voltage conversion module 30 is the step-down working state, so that the switching switch module 20 is connected to the narrowband Internet of Things control module 10, so as to directly transmit the power signal to the narrowband Internet of Things control module 10, thereby providing power for the narrowband Internet of Things control module 10. At this time, there is no need to power the narrowband Internet of Things control module 10 through the DC-DC voltage conversion module 30, which effectively avoids the phenomenon of current loss caused by the working efficiency of the DC-DC voltage conversion module 30 when the DC-DC voltage conversion module 30 is in the step-down working state, thereby reducing the power consumption of the narrowband Internet of Things terminal during the power supply process, thereby improving the battery life.

[0068] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A narrowband Internet of Things terminal, characterized in that: include: A narrowband Internet of Things control module, used for detecting the working state of the DC-DC voltage conversion module; and when determining that the working state of the DC-DC voltage conversion module is a step-down working state, sending a first control signal to the switching switch module; when determining that the working state of the DC-DC voltage conversion module is a non-step-down working state, sending a second control signal to the switching switch module; The switching switch module is used to receive a power signal; and when receiving the first control signal, connect to the narrowband Internet of Things control module to transmit the power signal to the narrowband Internet of Things control module, thereby providing power for the narrowband Internet of Things control module; as well as, and further configured to connect the DC-DC voltage conversion module to transmit the power signal to the DC-DC voltage conversion module when receiving the second control signal; The DC-DC voltage conversion module is used to transmit the power signal to the narrowband Internet of Things control module when receiving the power signal transmitted by the switching switch module, so as to provide power for the narrowband Internet of Things control module; The narrowband Internet of Things control module is specifically used for: detecting the power supply signal; When the voltage value of the power signal is within a preset voltage range, determining that the working state of the DC-DC voltage conversion module is the step-down working state, and then sending the first control signal to the switching module; When the voltage value of the power signal is not within the preset voltage range, the working state of the DC-DC voltage conversion module is determined to be the non-voltage reduction working state, and then the second control signal is sent to the switching module.

2. The narrowband Internet of Things terminal according to claim 1, characterized in that: The narrowband Internet of Things control module is also used to send the second control signal to the switching switch module when the power signal is detected for the first time.

3. The narrowband Internet of Things terminal according to claim 1 or 2, characterized in that: The narrowband Internet of Things terminal also includes a voltage divider circuit detection module; The voltage divider circuit detection module is used to receive the power signal, divide the power signal, and transmit the divided power signal to the narrowband Internet of Things control module; The narrowband Internet of Things control module is also used to determine the voltage value of the power supply signal before voltage division according to the power supply signal after voltage division.

4. The narrowband Internet of Things terminal according to claim 3, characterized in that: The voltage divider circuit detection module includes a first resistor and a second resistor; One end of the first resistor is the input end of the voltage divider circuit detection module, which is used to receive the power supply signal; the other end of the first resistor is connected to one end of the second resistor; one end of the second resistor is the output end of the voltage divider circuit detection module, which is used to transmit the divided power supply signal to the narrowband Internet of Things control module; the other end of the second resistor is grounded.

5. The narrowband Internet of Things terminal according to claim 1 or 2, characterized in that: The DC-DC voltage conversion module is specifically used to adjust the voltage of the power signal to a preset power supply voltage when receiving the power signal transmitted by the switching switch module, and transmit the adjusted power signal to the narrowband Internet of Things control module, thereby providing power for the narrowband Internet of Things control module.

6. The narrowband Internet of Things terminal according to claim 1 or 2, characterized in that: The narrowband Internet of Things control module is a narrowband Internet of Things microprocessor chip.

7. The narrowband Internet of Things terminal according to claim 1 or 2, characterized in that: The DC-DC voltage conversion module is a BOOST type DC-DC converter chip.

8. A narrowband Internet of Things system, characterized in that: Comprising a power supply and a narrowband Internet of Things terminal as claimed in any one of claims 1 to 7; The power supply is used to provide the power signal to the narrowband Internet of Things terminal.

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