CN210609098U - NB-IoT communication module starting circuit, circuit board and Internet of things terminal - Google Patents
NB-IoT communication module starting circuit, circuit board and Internet of things terminal Download PDFInfo
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- CN210609098U CN210609098U CN201921640645.6U CN201921640645U CN210609098U CN 210609098 U CN210609098 U CN 210609098U CN 201921640645 U CN201921640645 U CN 201921640645U CN 210609098 U CN210609098 U CN 210609098U
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Abstract
The utility model relates to a NB-IoT communication module starting circuit, circuit board and thing networking terminal, this starting circuit include power, DC-DC device, reset IC device and NB-IoT communication module, the output of power with the input electricity of DC-DC device is connected, the output of DC-DC device respectively with the input of resetting IC device with NB-IoT communication module's voltage input end electricity is connected, the output of resetting IC device with NB-IoT communication module's signal input part electricity is connected, the resetting IC device is used for exporting low level pulse signal. The technical scheme of this application can eliminate the shake, improves the stability of circuit to convenient and fast, high-efficient practical.
Description
Technical Field
The utility model relates to a switch circuit technical field especially relates to a NB-IoT communication module starting circuit, circuit board and thing networking terminal.
Background
The NB-IoT (Narrow Band Internet of Things) is an important branch of the Internet of Things, has the characteristics of wide coverage, massive connection, low power consumption and the like, and the NB-IoT communication module is more and more widely applied with the high-speed development of the Internet of Things technology.
The NB-IoT communication module can be started only when the starting time sequence is met by inputting a low-level trigger signal from the outside. As shown in fig. 1, a combination of a key switch S1 and a TVS (transient voltage suppression diode) diode is commonly used to output a low level signal, one end of the key switch S1 is electrically connected to a cathode of the TVS diode and a signal input terminal (PWRKEY pin) of the NB-IoT communication module, respectively, the other end of the key switch S1 is grounded, and an anode of the TVS diode is grounded. When the key switch is closed, a low-level signal is input to the signal input end of the NB-IoT communication module.
However, when the push switch S1 is closed, a low-level signal cannot be immediately and stably output due to the elastic action of the mechanical contact, and a series of jitter occurs, which affects the stability of the circuit. On the other hand, after the NB-IoT communication module is powered on, a worker is required to manually close the key switch S1 to start the NB-IoT communication module, and when a plurality of NB-IoT communication modules need to be started, each NB-IoT communication module needs to be manually started by the worker, which consumes a lot of time.
SUMMERY OF THE UTILITY MODEL
To the not enough of above-mentioned prior art, the utility model provides a NB-IoT communication module starting circuit, circuit board and thing networking terminal.
The utility model provides an above-mentioned technical problem's technical scheme as follows:
in a first aspect, the utility model provides a pair of NB-IoT communication module starting circuit, including power, DC-DC device, the IC device that resets and NB-IoT communication module, the output of power with the input electricity of DC-DC device is connected, the output of DC-DC device respectively with the input of the IC device that resets with the voltage input electricity of NB-IoT communication module is connected, the output of the IC device that resets with NB-IoT communication module's signal input electricity is connected, the IC device that resets is used for exporting low level pulse signal.
The utility model discloses a NB-IoT communication module starting circuit's beneficial effect is: after the power supply is switched on, the DC-DC device converts the power supply output voltage into the NB-IoT communication module for supplying power, and meanwhile, after the reset IC device receives the voltage signal output by the DC-DC device, the reset IC device can continuously output a low-level trigger signal to the signal input end of the NB-IoT communication module to control the NB-IoT communication module to start. In the technical scheme of this application, through resetting IC device direct output low level trigger signal for NB-IoT communication module's signal input part after the power switch-on, need not set up key switch and TVS diode, can eliminate the shake, improved the stability of circuit to saved the step of manual closed key switch, simple and convenient saves time.
Further, the reset IC device comprises a constant current source, a first resistor, a second resistor, a comparator, a counter, a NAND gate device, a P-channel MOS tube and an N-channel MOS tube.
One end of the first resistor is electrically connected with the power supply, the other end of the first resistor is respectively electrically connected with one end of the second resistor and the positive input end of the comparator, the other end of the second resistor is grounded, the negative input end of the comparator is grounded and is electrically connected with the output end of the constant current source, the input end of the constant current source is electrically connected with the power supply, the output end of the comparator is respectively electrically connected with the input end of the counter and the first input end of the NAND gate device, the output end of the counter is electrically connected with the second input end of the NAND gate device, the output end of the NAND gate device is respectively electrically connected with the grid electrode of the P-channel MOS tube and the grid electrode of the N-channel MOS tube, the source electrode of the P-channel MOS tube is electrically connected with the direct current power supply, and the drain electrode of the P-channel MOS tube is respectively electrically connected with the drain electrode of the N-channel, and the source electrode of the N-channel MOS tube is grounded.
The beneficial effects of the further scheme are as follows: the constant current source is combined with the first resistor and the second resistor to set a reference voltage, the comparator compares the power output voltage with the reference voltage, when the power output voltage is larger than the reference voltage Vref, a pulse signal is output to the counter, the counter determines the duration of the pulse signal, the NAND gate device continuously outputs a low-level voltage signal within the duration, the low-level voltage signal is converted into a low-level current signal through the MOS tube and is input to the signal input end of the NB-IoT communication module, and the NB-IoT communication module is controlled to be started. After the power supply is switched on, the low-level trigger signal can be directly input to the NB-IoT communication module, a key switch is not required to be arranged, shaking is avoided, and convenience are realized.
The DC-DC power supply device further comprises a power supply management device, wherein the input end of the power supply management device is electrically connected with the output end of the power supply, and the output end of the power supply management device is electrically connected with the input end of the DC-DC device.
The beneficial effects of the further scheme are as follows: the power management device is used for converting the power output by the power supply.
Further, the power source is a rechargeable battery.
The beneficial effects of the further scheme are as follows: the rechargeable battery can be recycled, and the energy-saving and environment-friendly effects are achieved.
Further, the DC-DC device is a step-down power module.
In a second aspect, the present invention provides a circuit board, on which the NB-IoT communication module start circuit as described above is mounted.
The utility model discloses a beneficial effect of circuit board is: the circuit board has the advantages of simple structure, easy realization, higher integration level and higher reliability.
A third aspect of the present invention provides a terminal for internet of things, including the circuit board as described above.
The utility model discloses a beneficial effect at thing networking terminal is: the NB-IoT communication module of the Internet of things terminal can be started by switching on a power supply, is convenient and fast, has no jitter in the starting process, and has high stability.
Drawings
Fig. 1 is a circuit for starting up a conventional NB-IoT communication module;
fig. 2 is a timing diagram of the NB-IoT communication module when it is activated;
fig. 3 is a schematic connection diagram of an NB-IoT communication module start-up circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a reset IC device according to an embodiment of the present invention.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 2, after the NB-IoT communication module is powered on, an external input low-level trigger signal is required to start the NB-IoT communication module. When the NB-IoT communication module is powered on, the voltage input terminal of the NB-IoT communication module receives a stable high-level voltage signal, and if the trigger signal is a high-level signal at this time, the NB-IoT communication module is always in the S1 working mode, that is, in an inactive state. When the trigger signal is a low level signal, the NB-IoT communication module enters S2 operation mode, i.e., enters the activated state. When the trigger signal is a low level signal continuously and exceeds the calibration time, the NB-IoT communication module enters an S3 operation mode, i.e., completes the start-up, and enters an operation state.
As shown in fig. 3, an embodiment of the present invention provides an NB-IoT communication module start Circuit, including a power supply, a DC-DC (Direct current-Direct current conversion) device, a reset IC (Integrated Circuit) device and an NB-IoT communication module, wherein an output end of the power supply is electrically connected to an input end of the DC-DC device, an output end of the DC-DC device is electrically connected to an input end of the reset IC device and a voltage input end of the NB-IoT communication module, an output end of the reset IC device is electrically connected to a signal input end of the NB-IoT communication module, and the reset IC device is configured to output a low-level pulse signal.
In this embodiment, after the power is turned on, the DC-DC device converts the power output voltage into the NB-IoT communication module to supply power, and meanwhile, after the reset IC device receives the voltage signal output by the DC-DC device, the reset IC device continuously outputs the low-level trigger signal to the signal input end of the NB-IoT communication module to control the NB-IoT communication module to start. In the technical scheme of this application, through reset IC device direct output low level trigger signal for NB-IoT communication module's signal input part after the switch-on, need not set up key switch and TVS diode, can eliminate the shake, improved the stability of circuit to save manual closed key switch's step, simple and convenient, high-efficient practical, save time.
Specifically, the output end of the DC-DC device is electrically connected with a VDD pin of the RESET IC device and is also electrically connected with a VDD pin of the NB-IoT communication module, and a RESET pin of the RESET IC device is electrically connected with a PWRKEY pin of the NB-IoT communication module.
Preferably, as shown in fig. 4, the reset IC device includes a constant current source I, a first resistor R1, a second resistor R2, a comparator U1, a counter U2, a nand gate device U3, a P-channel MOS transistor Q1, and an N-channel MOS transistor Q2.
One end of the first resistor R1 is electrically connected to the power supply, the other end of the first resistor R1 is electrically connected to one end of the second resistor R2 and the positive input end of the comparator U1, the other end of the second resistor R2 is electrically connected to ground, the negative input end of the comparator U1 is electrically connected to ground and to the output end of the constant current source I, the input end of the constant current source I is electrically connected to the power supply, the output end of the comparator U1 is electrically connected to the input end of the counter U2 and the first input end of the nand gate device U3, the output end of the counter U2 is electrically connected to the second input end of the nand gate device U3, the output end of the nand gate device U3 is electrically connected to the gate of the P-channel MOS transistor Q1 and the gate of the N-channel MOS transistor Q2, the source of the P-channel MOS transistor Q1 is electrically connected to the VCC power supply, which may be the output end of the DC-DC device, the P-channel MOS transistor Q1 may have a drain electrically connected to the drain of the N-channel MOS transistor Q2 and a signal input of the NB-IoT communication module, where the signal input is a PWRKEY pin, and the source of the N-channel MOS transistor Q2 is grounded.
Specifically, the constant current source I sets a reference voltage Vref by combining the first resistor R1 and the second resistor R2, the comparator U1 compares the power output voltage with the reference voltage Vref, when the power output voltage is greater than the reference voltage Vref, a pulse signal is output to the counter U2, the counter U2 determines the duration of the pulse signal, the typical value of the duration is 400ms, the nand gate device U3 continuously outputs a low-level voltage signal within the duration, the low-level voltage signal is converted into a low-level current signal through the MOS transistor and is input to the signal input end of the NB-IoT communication module, and the NB-IoT communication module is controlled to be started.
To prevent the NB-IoT communication module from false triggering, the NB-IoT communication module is usually activated after continuously receiving the low trigger signal for at least 200 ms.
In the preferred embodiment, the low-level trigger signal can be continuously input to the signal input end of the NB-IoT communication module within a period of time after the power is switched on until the NB-IoT communication module is started, a key switch and a TVS diode are not required to be arranged, shaking is not caused, manual starting by a worker is not required, and the method is convenient and fast.
Preferably, the power supply device further comprises a power supply management device, wherein an input end of the power supply management device is electrically connected with an output end of the power supply, and an output end of the power supply management device is electrically connected with an input end of the DC-DC device.
Specifically, the power management device is used for converting power output electric energy, a power management chip with the type of HIP6301 can be adopted, a management program is arranged in the power management chip, and the power management chip is directly connected to convert the power output electric energy in the application, so that improvement on the method is not involved.
Preferably, the power source is a rechargeable battery.
Specifically, a rechargeable lithium battery can be adopted, the lithium battery has the advantages of high energy storage, long service life, environmental friendliness and the like, and the rechargeable battery can be recycled, so that the energy is saved and the environment is protected.
Preferably, the DC-DC device is a step-down power supply module.
Specifically, the output voltage of the rechargeable battery is 3.7V, the output of the power management device is 5V, or a battery with an output of 5V can be directly adopted, and the output of the step-down power module is 3.3V. The buck power module can adopt a buck power module with the model number of TPSM 82480.
Another embodiment of the present invention provides a circuit board, wherein the NB-IoT communication module start circuit is mounted on the circuit board.
In the embodiment, the circuit board is simple in structure, easy to realize, high in integration level and high in reliability.
The utility model discloses another embodiment provides a pair of thing networking terminal, include as above the circuit board.
In this embodiment, the NB-IoT communication module of the internet of things terminal can be started by powering on, and is convenient and fast, and has no jitter and high stability in the starting process.
In the description of the present invention, it is to be understood that the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (7)
1. The NB-IoT communication module starting circuit is characterized by comprising a power supply, a DC-DC device, a reset IC device and an NB-IoT communication module, wherein the output end of the power supply is electrically connected with the input end of the DC-DC device, the output end of the DC-DC device is respectively and electrically connected with the input end of the reset IC device and the voltage input end of the NB-IoT communication module, the output end of the reset IC device is electrically connected with the signal input end of the NB-IoT communication module, and the reset IC device is used for outputting a low-level pulse signal.
2. The NB-IoT communication module starting circuit according to claim 1, wherein the reset IC device comprises a constant current source, a first resistor, a second resistor, a comparator, a counter, an nand gate device, a P-channel MOS transistor and an N-channel MOS transistor;
one end of the first resistor is electrically connected with the power supply, the other end of the first resistor is respectively electrically connected with one end of the second resistor and the positive input end of the comparator, the other end of the second resistor is grounded, the negative input end of the comparator is grounded and is electrically connected with the output end of the constant current source, the input end of the constant current source is electrically connected with the power supply, the output end of the comparator is respectively electrically connected with the input end of the counter and the first input end of the NAND gate device, the output end of the counter is electrically connected with the second input end of the NAND gate device, the output end of the NAND gate device is respectively electrically connected with the grid electrode of the P-channel MOS tube and the grid electrode of the N-channel MOS tube, the source electrode of the P-channel MOS tube is electrically connected with the direct current power supply, and the drain electrode of the P-channel MOS tube is respectively electrically connected with the drain electrode of the N-channel MOS, and the source electrode of the N-channel MOS tube is grounded.
3. The NB-IoT communication module startup circuit of claim 1, further comprising a power management device having an input electrically connected to the output of the power supply and an output electrically connected to the input of the DC-DC device.
4. The NB-IoT communication module startup circuit of claim 3, wherein the power source is a rechargeable battery.
5. The NB-IoT communication module startup circuit of claim 4, wherein the DC-DC device is a step-down power supply module.
6. A circuit board on which the NB-IoT communication module activation circuit of any of claims 1-5 is mounted.
7. An internet of things terminal, comprising the circuit board of claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201921640645.6U CN210609098U (en) | 2019-09-29 | 2019-09-29 | NB-IoT communication module starting circuit, circuit board and Internet of things terminal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921640645.6U CN210609098U (en) | 2019-09-29 | 2019-09-29 | NB-IoT communication module starting circuit, circuit board and Internet of things terminal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111478685A (en) * | 2020-03-17 | 2020-07-31 | 普联技术有限公司 | Power-on anti-shake circuit and electronic equipment |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111478685A (en) * | 2020-03-17 | 2020-07-31 | 普联技术有限公司 | Power-on anti-shake circuit and electronic equipment |
| CN111478685B (en) * | 2020-03-17 | 2024-04-02 | 上海联虹技术有限公司 | Power-on anti-shake circuit and electronic equipment |
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