CN112564268B - Internet of things tracker terminal equipment - Google Patents
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- CN112564268B CN112564268B CN202011521498.8A CN202011521498A CN112564268B CN 112564268 B CN112564268 B CN 112564268B CN 202011521498 A CN202011521498 A CN 202011521498A CN 112564268 B CN112564268 B CN 112564268B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The invention relates to a tracker terminal device of the Internet of things, comprising: the power supply switching device comprises a main power supply, a standby power supply, a power supply switching unit, a voltage conversion unit, a control unit and a power supply switching detection unit, wherein the power supply switching unit comprises a first input end, a second input end and an output end; the main power supply is connected with the first input end of the power supply switching unit and the power supply switching detection unit; the voltage conversion unit is connected with a second input end of the power supply switching circuit and a standby power supply; the control unit is connected with the output end of the power supply switching unit and the voltage conversion unit; the power supply switching detection unit is connected with the first input end of the power supply switching unit, the output end of the power supply switching unit and the voltage conversion unit and is used for starting the voltage conversion unit when detecting that the voltage of the main power supply is abnormal, and supplying the electric energy of the standby power supply to the control unit through the voltage conversion unit and the power supply switching circuit. The Internet of things tracker terminal equipment can reduce the power consumption of the Internet of things tracker terminal equipment.
Description
Technical Field
The invention relates to the technology of the Internet of things, in particular to a tracker terminal device of the Internet of things.
Background
The internet of things is a research hotspot in recent years, and aims to realize ubiquitous connection of things and people and intelligent perception, identification and management of articles and processes. The tracker terminal is used as important terminal equipment in industries such as the Internet of things and the Internet of vehicles, has the functions of positioning, information acquisition, transmission and the like, can be applied to industries such as mobile logistics and vehicle-mounted products, and can realize the functions of positioning and tracking, track reporting, communication with mobile terminals (such as mobile phones) and the like. The tracker terminal which is not supplied with power from an external power source and needs to operate for a long time after being mounted is required to have high reliability and low power consumption.
An additional tamper detection unit is required in the conventional tracker terminal to detect whether the power supply is in place. The anti-dismantling detection unit is often realized by adopting light sensation and other modes, and electricity consumption is also needed during working, so that the power consumption of the tracker terminal equipment is increased, and the endurance of the tracker terminal equipment is reduced.
Disclosure of Invention
Based on the method, in order to reduce the power consumption of the Internet of things tracker terminal equipment and improve the cruising ability of the Internet of things tracker terminal equipment, a new Internet of things tracker terminal equipment is provided.
An internet of things tracker terminal device comprising: the power supply switching device comprises a main power supply, a standby power supply, a power supply switching unit, a voltage conversion unit, a control unit and a power supply switching detection unit, wherein the power supply switching unit comprises a first input end, a second input end and an output end; the main power supply is connected with the first input end of the power supply switching unit and the power supply switching detection unit; the voltage conversion unit is connected with a second input end of the power supply switching circuit and a standby power supply; the control unit is connected with the output end of the power supply switching unit and the voltage conversion unit; the power supply switching detection unit is connected with the first input end of the power supply switching unit, the output end of the power supply switching unit and the voltage conversion unit and is used for starting the voltage conversion unit when detecting that the voltage of the main power supply is abnormal, and supplying the electric energy of the standby power supply to the control unit through the voltage conversion unit and the power supply switching circuit.
Above-mentioned thing networking tracker terminal equipment, through the mutual cooperation between power switching detecting element, power switching element, voltage transformation unit and the control unit, realized the detection in place to main power supply, need not to additionally set up the anti-unpick detecting element, reduced thing networking tracker terminal equipment's consumption, improved equipment duration.
In one embodiment, the internet of things tracker terminal device further comprises a first switch unit; the main power supply is connected to the power supply switching unit and the power supply switching detection unit through the first switching unit.
In one embodiment, the terminal device of the tracker of the internet of things further comprises a radio frequency unit; the radio frequency unit is connected with the voltage conversion unit and the control unit.
In one embodiment, the terminal device of the tracker of the internet of things further comprises a second switch unit, wherein the second switch unit is connected with the first switch unit, the standby power supply, the voltage conversion unit and the control unit and is used for being closed according to a control signal sent by the control unit, so that the main power supply and the standby power supply are connected in parallel and then jointly supply power to the radio frequency unit through the voltage conversion unit, or the main power supply is disconnected according to the control signal sent by the control unit, so that the main power supply stops supplying power to the radio frequency unit.
In one embodiment, the power supply switching detection unit includes: the MOS device comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first MOS tube and a second MOS tube, wherein a first end of the first resistor is connected with a first switch unit, a second end of the first resistor is connected with a first end of the second resistor, and a second end of the second resistor is grounded; the control end of the first MOS tube is connected with the second end of the first resistor and the first end of the second resistor, the first end of the first MOS tube is connected with the first end of the third resistor, and the second end of the first MOS tube is grounded; the control end of the second MOS tube is connected with the second end of the third resistor and the first end of the fourth resistor, the first end of the second MOS tube is connected with the second end of the fourth resistor and the output end of the power switching circuit, and the second end of the second MOS tube is connected with the first end of the fifth resistor and then is used as the output end of the power switching detection circuit; the second end of the fifth resistor is grounded.
In one embodiment, the power switching unit includes: the first diode and the second diode, wherein the positive electrode of the first diode is connected with the first switch unit; the positive electrode of the second diode is connected with the output end of the voltage conversion unit, and the negative electrode of the second diode is connected with the negative electrode of the first diode and then is used as the output end of the power supply switching circuit.
In one embodiment, the terminal device of the tracker of the internet of things further includes: a triode, a sixth resistor and a seventh resistor; the emitter of the triode is connected with a standby power supply, and the collector of the triode is connected with the first switch unit through a sixth resistor; the base electrode of the triode is connected with the first switch unit through a seventh resistor.
In one embodiment, the primary power source is a replaceable battery, including a lithium-ion type battery; the backup power source includes a super capacitor.
In one embodiment, the terminal device of the tracker of the internet of things further includes: and the display unit is connected with the control unit and the power supply switching unit and is used for displaying the power supply use information.
In one embodiment, the terminal device of the tracker of the internet of things further includes: the sensor unit is connected with the control unit and the power supply switching unit and is used for checking the external environment of the terminal equipment of the tracker of the Internet of things and determining whether to wake up the control unit according to the checking result.
Drawings
Fig. 1 is a block diagram of a tracker terminal device of the internet of things in an embodiment.
Fig. 2 is a block diagram of a tracker terminal device of the internet of things in another embodiment.
Fig. 3 is a block diagram of a tracker terminal device of the internet of things in yet another embodiment.
Fig. 4 is a block diagram of a structure of an internet of things tracker terminal device in yet another embodiment.
Fig. 5 is a schematic diagram of an internal circuit of a power switch detection unit in an internet of things tracker terminal device according to an embodiment.
Fig. 6 is a schematic diagram of an internal circuit of a power switching unit in an internet of things tracker terminal device according to an embodiment.
Fig. 7 is a block diagram of a structure of an internet of things tracker terminal device in an embodiment.
The drawings are marked with the following description: 11. a main power supply; 12. a power supply switching detection unit; 13. a power supply switching unit; 14. a control unit; 15. a standby power supply; 16. a voltage conversion unit; 17. a first switching unit; 18. a radio frequency unit; 19. a second switching unit; r1, a first resistor; r2, a second resistor; r3, a third resistor; r4, a fourth resistor; r5, a fifth resistor; r6, a sixth resistor; r7, a seventh resistor; q1, a first MOS tube; q2, a second MOS tube; q3, triode; d1, a first diode; d2, a second diode.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In describing positional relationships, when an element such as a layer, film or substrate is referred to as being "on" another film layer, it can be directly on the other film layer or intervening film layers may also be present, unless otherwise indicated. Further, when a layer is referred to as being "under" another layer, it can be directly under, or one or more intervening layers may also be present. It will also be understood that when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present.
Where the terms "comprising," "having," and "including" are used herein, another component may also be added unless explicitly defined as such, e.g., "consisting of … …," etc. Unless mentioned to the contrary, singular terms may include plural and are not to be construed as being one in number.
As shown in fig. 1, an embodiment of the present application provides an internet of things tracker terminal device, including: the power supply comprises a main power supply 11, a standby power supply 15, a power supply switching unit 13, a voltage conversion unit 16, a control unit 14 and a power supply switching detection unit 12, wherein the power supply switching unit 13 comprises a first input end, a second input end and an output end; the main power supply 11 is connected with a first input end of the power supply switching unit 13 and the power supply switching detection unit 12; the voltage conversion unit 16 is connected with the second input end of the power supply switching circuit and the standby power supply 15; the control unit 14 is connected with the output end of the power supply switching unit 13 and the voltage conversion unit 16; the power switching detection unit 12 is connected to a first input terminal of the power switching unit 13, an output terminal of the power switching unit 13, and the voltage conversion unit 16, and is configured to activate the voltage conversion unit 16 when detecting that the voltage of the main power supply 11 is abnormal, and supply the electric power of the backup power supply 15 to the control unit 14 via the voltage conversion unit 16 and the power switching circuit.
In this embodiment, the power switching detection unit 12 is connected to the first input terminal of the power switching unit 13, the output terminal of the power switching unit 13, and the voltage conversion unit 16 to implement in-place detection and/or voltage change detection of the main power supply 11. When the main power supply 11 is in place and the voltage is normal, the main power supply 11 supplies power to the first input terminal of the power supply switching unit 13 and the first input terminal of the power supply switching detection unit 12. The internal circuit of the power switching detection unit 12 is turned on, so that the output terminal of the power switching detection circuit is in short-circuit connection with the second input terminal thereof. At the same time, the output terminal of the power switching unit 13 outputs the voltage supplied from the main power supply 11, and supplies it to the second input terminals of the control unit 14 and the power switching detection unit 12. At this time, since the output terminal of the power switching detection unit 12 is short-circuited to the second input terminal thereof, and the power switching unit 13 supplies the voltage supplied from the main power supply 11 to the second input terminal of the power switching detection unit 12 through the output terminal thereof, the output terminal of the power switching detection circuit outputs a high voltage. The voltage converting unit 16 receives the high level signal and is not awakened.
When the main power supply 11 is forcibly removed by an external force, the first input terminals of the power supply switching unit 13 and the power supply switching detection unit 12 are both turned to a low level, and the internal circuit of the power supply switching detection circuit is not turned on any more, so that the output terminal and the second input terminal thereof become disconnected, that is, the voltage output by the power supply switching unit 13 to the power supply switching detection unit 12 cannot influence the voltage of the output terminal of the power supply switching detection unit 12 any more. At this time, the output terminal of the power switching detection unit 12 is grounded through a resistor, and the output terminal level is forcibly pulled down to zero. At this time, the voltage conversion unit 16 receives the low level signal to wake up, and starts the operation.
Alternatively, the voltage conversion unit 16 may be a DC/DC power converter, which starts to operate after receiving the low level signal, and continuously supplies power to the control unit 14 via the power switching unit 13 after converting the voltage provided by the standby power supply 15 to the DC/DC voltage, so as to complete the switching from the main power supply 11 to the standby power supply 15.
During the above-described power switching, the control unit 14 may acquire information that the main power supply 11 is out of place based on at least two signal changes. The power supply voltage provided to the control unit 14 may be different before and after the main power supply 11 is removed (for example, the voltage is high when the main power supply 11 is powered and the voltage is low when the standby power supply 15 is powered); secondly, after the main power supply 11 is removed, a certain time gap must exist until the standby power supply 15 starts to supply power to the control unit 14, the control unit 14 is in a power-off state, and the control unit 14 can identify the power-off state. Therefore, by detecting the above two signal changes, the control unit 14 can determine that the main power supply 11 is in place with the aid of the power supply switching detection unit 12, the power supply switching unit 13 and the voltage conversion unit 16, without using a special tamper detection unit, and power consumption of the terminal device of the tracker of the internet of things is reduced. In an alternative solution, the output terminal of the power switch detecting unit 12 may also be directly connected to the control unit 14 (not shown in the figure), and the high level signal or the low level signal of the output terminal of the power switch detecting unit 12 is provided to the control unit 14. The control unit 14 can determine the on-site condition of the main power supply 11 based on the signal.
In addition, the terminal device of the tracker of the internet of things in the embodiment can also complete the switching of the power supply when the electric quantity of the main power supply 11 is insufficient. When the power of the main power supply 11 is insufficient, normal operating voltage cannot be provided for other circuit units, and the level of the first input terminal of the power switching detection unit 12 is continuously reduced. When the output voltage of the main power supply 11 decreases to the first voltage, the internal circuit of the power supply switching detection unit 12 is turned off, the short circuit connection between the output terminal of the power supply switching detection unit 12 and the second input terminal thereof is changed into the open circuit connection, and at this time, the output terminal of the power supply switching detection unit 12 is forcibly pulled down through a resistor to ground, and a low level is output. The tracker terminal device of the internet of things completes the switching from the main power supply 11 to the standby power supply 15 by adopting a similar method to the above-mentioned switching power supply. Alternatively, the first voltage may be one half, one third or two thirds of the normal working voltage, and those skilled in the art may perform corresponding adjustment according to actual needs, which is not limited in this application.
Since the control unit 14 is connected to the output terminal of the power switching unit 13, when the main power supply 11 is switched to the standby power supply 15 due to low power, the input voltage of the control unit 14 is reduced and then becomes the voltage supplied from the standby power supply 15. Whereas if the main power supply 11 is removed in the normal operating state, there is no phase of the above-described voltage drop in the input voltage of the control unit 14. Thus, it can be determined whether the main power supply 11 is removed or the main power supply 11 is switched to the backup power supply 15 due to low power.
The Internet of things tracker terminal equipment in the implementation realizes the in-place detection of the main power supply 11 through the mutual coordination among the power supply switching detection unit 12, the power supply switching unit 13, the voltage conversion unit 16 and the control unit 14, does not need to additionally arrange a tamper detection unit, reduces the power consumption of the Internet of things tracker terminal equipment, and improves the cruising ability.
In one example, as shown in fig. 2, a first switching unit 17 is added on the basis of the embodiment shown in fig. 1, and the main power supply 11 is connected to the power supply switching unit 13 and the power supply switching detection unit 12 through the first switching unit 17.
According to the transportation and storage safety specifications, the internet of things tracker terminal equipment needs to be shut down or powered off for transportation when leaving the factory, but the traditional internet of things tracker terminal equipment is not provided with a startup and shutdown key, and the internal main power supply 11 is usually pulled out. This results in that the user needs to reinstall the main power supply 11 when installing the apparatus, which reduces the convenience of use of the internet of things tracker apparatus, and if the main power supply 11 is not tightly installed, it may result in deterioration of antistatic and waterproof capabilities of the product. Therefore, it is necessary to provide a switching unit between the main power supply 11 and other circuit structures of the device to solve the above-described problems. In the present embodiment, the first switch unit 17 is connected between the main power supply 11 and other circuit structures for controlling whether the main power supply 11 is connected to the circuit. Alternatively, the first switch unit 17 may be a mechanical key switch. Alternatively, the first switching unit 17 may also be an electronic switch. Preferably, in this embodiment, the first switch unit 17 is a mechanical key switch, and the mechanical key switch is kept in an off state when the terminal device of the tracker of the internet of things leaves the factory, and is protected from being touched or pressed by mistake in cooperation with an external structure. In addition, the initial state of the voltage converting unit 16 is set to the off state, and needs to be started by an external signal. Therefore, the tracker terminal equipment of the Internet of things can be ensured to be in a complete power-off state when leaving the factory. After the user installs, press mechanical key switch, connect main power supply 11 to the circuit, begin to supply power for thing networking tracker terminal equipment.
Through setting up first switch unit 17, can realize keeping the off state when thing networking tracker terminal equipment leaves the factory, need not to demolish main power supply 11, avoid the installation that the user appears when reinstalling main power supply 11 not tightly to lead to antistatic ability and waterproof ability variation problem, improved thing networking tracker terminal equipment's convenience of use.
In one example, as shown in fig. 3, the internet of things tracker terminal device further comprises a radio frequency unit 18, the radio frequency unit 18 being connected to the voltage conversion unit 16 and the control unit 14. When the main power supply 11 is removed or power cannot be supplied normally due to too low electric quantity, the terminal equipment of the tracker of the internet of things is switched to the standby power supply 15, and data is sent through the radio frequency unit 18 to report the current equipment state to a user. Specifically, the standby power supply 15 supplies power to the radio frequency unit 18 through the voltage conversion unit 16, and the control unit 14 supplies data to be transmitted to the radio frequency unit 18. The information conveyed in the data may include: the current position, the electric quantity information of the standby power supply 15, the remaining endurance time, whether the main power supply 11 is in place or not and the like are convenient for a user to know the service condition of the terminal equipment of the tracker of the Internet of things in time. In addition, the radio frequency unit 18 is further configured to transmit the data received by the antenna to the control unit 14, so as to execute the control instruction sent by the user.
In one example, as shown in fig. 4, on the basis of the embodiment shown in fig. 3, the terminal device of the tracker of the internet of things further includes a second switch unit 19, where the second switch unit 19 is connected to the first switch unit 17, the standby power supply 15, the voltage conversion unit 16 and the control unit 14, and is configured to be closed according to a control signal sent by the control unit 14, so that the main power supply 11 and the standby power supply 15 are connected in parallel and then jointly supply power to the radio frequency unit 18 through the voltage conversion unit 16, or disconnect according to the control signal sent by the control unit 14, so that the main power supply 11 stops supplying power to the radio frequency unit 18.
In the actual working process of the tracker terminal device of the internet of things, in order to improve the stability when the radio frequency unit 18 sends data, the main power supply 11 and the standby power supply 15 can be connected in parallel to jointly supply power for the radio frequency unit 18. Specifically, when the tracker terminal device of the internet of things needs to send data to a remote server or a cloud, the control unit 14 first sends a control instruction to the second switch unit 19, so that the second switch unit 19 is closed (the second switch unit 19 may be an electronic switch), and the main power supply 11 and the standby power supply 15 are connected in parallel. Next, the control unit 14 sends a control command to the voltage conversion unit 16, controls the voltage conversion unit 16 to start operating, DC/DC voltage converts the voltage output after the primary power source 11 and the backup power source 15 are connected in parallel, and sends the converted voltage to the radio frequency unit 18, so as to provide the radio frequency unit 18 with a voltage required for data transmission.
In this embodiment, by connecting the main power supply 11 and the standby power supply 15 in parallel, the transient discharge capability of the main power supply 11 can be improved, stable voltage supply to the radio frequency unit 18 can be realized, and the stability of the data transmission signal can be ensured.
In one example, as shown in fig. 5, the power supply switching detection unit 12 includes: the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the first MOS tube Q1 and the second MOS tube Q2, wherein the first end of the first resistor R1 is connected with the first switch unit 17, the second end of the first resistor R1 is connected with the first end of the second resistor R2, and the second end of the second resistor R2 is grounded; the control end of the first MOS tube Q1 is connected with the second end of the first resistor R1 and the first end of the second resistor R2, the first end of the first MOS tube Q1 is connected with the first end of the third resistor R3, and the second end of the first MOS tube Q1 is grounded; the control end of the second MOS tube Q2 is connected with the second end of the third resistor R3 and the first end of the fourth resistor R4, the first end of the second MOS tube Q2 is connected with the second end of the fourth resistor R4 and the output end of the power switching circuit, and the second end of the second MOS tube Q2 is connected with the first end of the fifth resistor R5 and then is used as the output end of the power switching detection circuit; the second terminal of the fifth resistor R5 is grounded.
IN fig. 5, the IN1 terminal and the IN2 terminal refer to the first input terminal and the second input terminal of the power switching detection unit 12, respectively, and the OUT terminal refers to the output terminal of the power switching detection unit 12. The first MOS transistor Q1 may be an NMOS transistor, and the second MOS transistor Q2 may be a PMOS transistor. Taking the first MOS transistor Q1 as an NMOS transistor and the second MOS transistor Q2 as a PMOS transistor as an example, the specific operation mode of the power switching detection unit 12 is as follows:
when the main power supply 11 is operating normally, the first input and the output of the power switching unit 13 are both high. IN fig. 5, the IN1 terminal is also at a high level, and the gate voltage of the NMOS transistor reaches the turn-on voltage by the voltage division action of the first resistor R1 and the second resistor R2, so that the NMOS transistor is turned on. The gate voltage of the PMOS tube is grounded through the third resistor R3 and is forced to be pulled down, and the PMOS tube is conducted, so that the OUT end and the IN2 end are connected IN a short circuit. As can be seen from the embodiment shown IN fig. 1, the output terminal of the power switching unit 13 is connected to the second input terminal (IN 2 terminal) of the power switching detection unit 12, so that the voltage at the IN2 terminal is the same as the output voltage of the power switching unit 13 and is at a high level. Also, since the OUT terminal is short-circuited with the IN2 terminal, the power supply switching detection unit 12 outputs a high level signal.
When the power of the main power supply 11 is low to a certain extent, the output voltage of the main power supply 11 cannot provide a high enough turn-on voltage for the gate of the PMOS transistor, and the NMOS transistor is turned off. The output voltage of the power supply is input to the second input terminal (IN 2 terminal) of the power supply switching detection unit 12 through the output terminal of the power supply switching unit 13. At this time, although the output voltage of the power supply cannot provide a high enough turn-on voltage for the gate of the NMOS transistor, the output voltage of the power supply is not yet reduced to the turn-on voltage of the gate of the PMOS transistor, and therefore, the gate voltage of the PMOS transistor is pulled up through the fourth resistor R4, and the PMOS transistor is in the turn-off state. At this time, the OUT terminal and the IN2 terminal are IN an open circuit connection state. Since the OUT terminal is also grounded through the fifth resistor R5, the OUT terminal level is zero in the case where no voltage is externally supplied, and the output terminal of the power supply switching detection unit 12 outputs a low level.
When the main power supply 11 is removed, the IN1 end is a low level signal, and the NMOS tube is turned off according to the analysis; the IN2 end is also a low-level signal, the grid voltage of the PMOS tube is pulled down through the fourth resistor R4, and the PMOS tube is conducted, so that the OUT end is IN short circuit connection with the IN2 end. Since the IN2 terminal is low, the OUT terminal is also low. The output terminal of the power supply switching detection unit 12 outputs a low level signal.
Through the circuit design in this embodiment, the power supply switching detection unit 12 can timely detect the in-place situation and the abnormal situation of the power supply of the main power supply 11, and output a high level or a low level through the output end thereof to inform the external circuit of making corresponding adjustment. In addition, the power supply switching detection voltage in the embodiment has no power consumption element, so that the anti-dismantling detection unit in the traditional Internet of things tracker terminal equipment can be replaced, the overall power consumption of the equipment is reduced, and the cruising ability of the equipment is further improved.
In one example, the power supply switching unit 13 may be implemented by a diode switching circuit, or may be implemented by an alternative switch integrated circuit. Preferably, the power supply switching unit 13 is implemented by a diode switching circuit. As shown in fig. 6, the power supply switching unit 13 includes: a first diode D1 and a second diode D2, wherein the positive electrode of the first diode D1 is connected to the first switching unit 17; the positive electrode of the second diode D2 is connected to the output terminal of the voltage conversion unit 16, and the negative electrode of the second diode D2 is connected to the negative electrode of the first diode D1 and then used as the output terminal of the power switching circuit.
The positive electrode of the first diode D1 is connected to the first switching unit 17 or the main power supply 11, and the positive electrode of the second diode D2 is connected to the output terminal of the voltage converting unit 16. The output terminal of the power switching unit 13 outputs the higher value of the first diode D1 input terminal voltage and the second diode D2 input terminal voltage. The first diode D1 and the second diode D2 can prevent the voltage at the output terminal of the power switching unit 13 from being reverse-pumped to the input terminal of the power switching unit 13.
In one example, as shown in fig. 7, on the basis of the embodiment shown in fig. 4, the tracker terminal device of the internet of things further includes: transistor Q3, sixth resistor R6 and seventh resistor R7; the emitter of the triode Q3 is connected with a standby power supply 15, and the collector of the triode Q3 is connected with a first switch unit 17 through a sixth resistor R6; the base of the transistor Q3 is connected to the first switching unit 17 via a seventh resistor R7.
When the electric quantity of the main power supply 11 is used up and is taken out for replacement, the standby power supply 15 supplies power to the terminal equipment of the Internet of things tracker, and a part of the electric quantity in the standby power supply 15 is consumed. At this time, if the main power supply 11 and the standby power supply 15 are connected in parallel through the second switching unit 19 immediately after the installation of the new, full-power main power supply 11 is completed, the radio frequency unit 18 is powered for data transmission, and the level of the main power supply 11 is likely to be pulled down by the low-power standby power supply 15 (due to excessive current between the main power supply 11 and the standby power supply 15), resulting in unstable power supply voltage, and the stability of the data transmission signal cannot be ensured. In this case, therefore, the control unit 14 controls the second switching unit 19 to be turned off so that the main power source 11 and the standby power source 15 are connected through the transistor circuit (i.e., the transistor Q3, the sixth electronic and the seventh resistor R7). The low current connection between the main power supply 11 and the standby power supply 15 can be realized by the triode circuit, and the level of the main power supply 11 can be prevented from being abnormally pulled down by the standby power supply 15. And, through adjusting the amplification factor of sixth resistance R6, seventh resistance R7 and triode Q3, can also set up the maximum current that flows through triode Q3 to satisfy the normal work demand of system.
In one example, the primary power source 11 in the embodiment of fig. 1 is a replaceable external battery, and in particular, a lithium-ion type battery may be employed. Compared with the traditional lithium battery or lithium manganese battery, the lithium subtype battery has wider working temperature range, can stably work at the limit temperature of 100 degrees or minus 40 degrees and has higher reliability. Also, the self-discharge rate of the lithium-subtype battery is lower, which is only 1% per year, and thus the shelf life is longer. The lithium subtype battery discharges with small current, and the battery level keeps stable during discharging, and does not change linearly with the electric quantity. And, the cost of the lithium-subtype battery is also lower than that of a conventional lithium battery or lithium manganese battery.
The backup power supply 15 is generally not replaceable, and a super capacitor can be used. In particular, in order to reduce the cost and energy loss during the charging process of the backup power supply 15, the application uses a super capacitor battery with a small capacity. Since the capacitor battery is self-discharged after a period of time, in order to avoid the situation that the power of the standby power supply 15 is low when the standby power supply 15 needs to be used, the main power supply 11 periodically charges the standby power supply 15 to refresh the power of the standby power supply 15. The traditional internet of things tracker terminal equipment often adopts the super capacitor battery of large capacity, and the electric quantity that loses in the self-discharge phenomenon is also bigger, and the more the electric energy that is used for compensating self-discharge loss in the main power supply 11 also, objectively reduced the duration of internet of things tracker terminal equipment. Therefore, the charging loss of the standby battery can be reduced by adopting the low-capacity super-capacitor battery, and the whole endurance time of the equipment is improved.
In one example, the internet of things tracker terminal device further comprises a display unit, which is connected to the control unit 14 and the power switching unit 13 for displaying power usage information. The displayable power usage information includes: the type of power supply currently used, the remaining power of the power supply currently used, and the like. The display mode includes, but is not limited to, a smart display screen and/or an LED lamp.
In one example, the internet of things tracker terminal device further comprises a sensor unit, which is connected to the control unit 14 and the power switching unit 13, and is configured to check an external environment of the internet of things tracker terminal device, and determine whether to wake up the control unit 14 according to a result of the check. Specifically, when the tracker terminal device of the internet of things is in the standby state, the control unit 14 controls the second switching unit 19 and the voltage conversion unit 16 to be turned off simultaneously, and the control unit 14 itself also enters the sleep state, so as to reduce the power consumption of the system to the greatest extent. When the sensor unit detects that the external state changes (such as displacement change or acceleration change or obvious change of ambient temperature and humidity), the control unit 14 can be awakened in time, the whole internet of things tracker terminal equipment is activated through the control unit 14, a signal is sent outwards, and the current position is reported.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. The utility model provides an thing networking tracker terminal equipment which characterized in that, thing networking tracker terminal equipment includes: a main power supply, a standby power supply, a power supply switching unit, a voltage conversion unit, a control unit, a power supply switching detection unit and a first switch unit, wherein,
the power supply switching unit comprises a first input end, a second input end and an output end;
the main power supply is connected with the first input end of the power supply switching unit and the power supply switching detection unit;
the voltage conversion unit is connected with the second input end of the power supply switching circuit and the standby power supply;
the control unit is connected with the output end of the power supply switching unit and the voltage conversion unit;
the power supply switching detection unit is connected with the first input end of the power supply switching unit, the output end of the power supply switching unit and the voltage conversion unit, and is used for starting the voltage conversion unit when detecting that the voltage of the main power supply is abnormal, and supplying the electric energy of the standby power supply to the control unit through the voltage conversion unit and the power supply switching circuit;
the main power supply is connected to the power supply switching unit and the power supply switching detection unit through the first switching unit;
the power supply switching detection unit includes: the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the first MOS tube and the second MOS tube; wherein,,
the first end of the first resistor is connected with the first switch unit, the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is grounded;
the control end of the first MOS tube is connected with the second end of the first resistor and the first end of the second resistor, the first end of the first MOS tube is connected with the first end of the third resistor, and the second end of the first MOS tube is grounded;
the control end of the second MOS tube is connected with the second end of the third resistor and the first end of the fourth resistor, the first end of the second MOS tube is connected with the second end of the fourth resistor and the output end of the power switching unit, and the second end of the second MOS tube is connected with the first end of the fifth resistor and then is used as the output end of the power switching detection circuit;
the second end of the fifth resistor is grounded.
2. The internet of things tracker terminal equipment of claim 1, wherein the first switch unit is a mechanical key switch or an electronic switch.
3. The internet of things tracker terminal equipment of claim 2, further comprising a radio frequency unit; the radio frequency unit is connected with the voltage conversion unit and the control unit.
4. The internet of things tracker terminal equipment according to claim 3, further comprising a second switch unit, wherein the second switch unit is connected with the first switch unit, the standby power supply, the voltage conversion unit and the control unit, and is used for being closed according to a control signal sent by the control unit, so that the main power supply and the standby power supply are connected in parallel and then jointly supply power to the radio frequency unit through the voltage conversion unit, or are disconnected according to a control signal sent by the control unit, so that the main power supply stops supplying power to the radio frequency unit.
5. The internet of things tracker terminal equipment according to any of claims 2-4, wherein the first MOS transistor is an NMOS transistor; the second MOS tube is a PMOS tube.
6. The internet of things tracker terminal equipment according to any of claims 2-4, wherein the power switching unit comprises: a first diode and a second diode, wherein,
the anode of the first diode is connected with the first switch unit;
the positive electrode of the second diode is connected with the output end of the voltage conversion unit, and the negative electrode of the second diode is connected with the negative electrode of the first diode and then is used as the output end of the power supply switching circuit.
7. The internet of things tracker terminal equipment of any of claims 2-4, further comprising: a triode, a sixth resistor and a seventh resistor; the emitting electrode of the triode is connected with the standby power supply, and the collecting electrode of the triode is connected with the first switch unit through the sixth resistor; and the base electrode of the triode is connected with the first switch unit through the seventh resistor.
8. The internet of things tracker terminal equipment of claim 1, wherein said primary power source is a replaceable battery comprising a lithium subtype battery; the backup power source comprises a super capacitor.
9. The internet of things tracker terminal equipment of claim 8, further comprising: and the display unit is connected with the control unit and the power supply switching unit and is used for displaying power supply use information.
10. The internet of things tracker terminal equipment of claim 8, further comprising: the sensor unit is connected with the control unit and the power supply switching unit, and is used for checking the external environment of the terminal equipment of the tracker of the Internet of things and determining whether to wake up the control unit according to the checking result.
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| CN202011521498.8A CN112564268B (en) | 2020-12-21 | 2020-12-21 | Internet of things tracker terminal equipment |
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| CN113708478A (en) * | 2021-08-27 | 2021-11-26 | 深圳市海雅达数字科技有限公司 | Intelligent terminal based on super capacitor standby power supply and power supply switching method thereof |
| CN114089825B (en) * | 2022-01-18 | 2022-04-19 | 中科可控信息产业有限公司 | Power supply method and power supply circuit of server |
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