CN219801912U - Power management device of positioning terminal and positioning terminal - Google Patents
Power management device of positioning terminal and positioning terminal Download PDFInfo
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- CN219801912U CN219801912U CN202223185208.4U CN202223185208U CN219801912U CN 219801912 U CN219801912 U CN 219801912U CN 202223185208 U CN202223185208 U CN 202223185208U CN 219801912 U CN219801912 U CN 219801912U
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 23
- 238000001514 detection method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 15
- 230000001629 suppression Effects 0.000 description 6
- 230000001052 transient effect Effects 0.000 description 6
- 230000005669 field effect Effects 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 101100112673 Rattus norvegicus Ccnd2 gene Proteins 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Abstract
The utility model relates to a power management device of a positioning terminal and the positioning terminal. The power management device includes: a charging circuit connected to an external power supply device and a built-in power supply of the positioning terminal, for supplying a working power supply through the external power supply device and charging the built-in power supply; a power supply selection circuit connected to the charging circuit and the built-in power supply for comparing a voltage of the operating power supply with an output voltage of the built-in power supply to select the operating power supply or the built-in power supply to provide a power supply; and the voltage conversion circuit is connected with the power supply selection circuit and used for converting the power supply into load output voltage. The technical scheme of the utility model can meet the power supply and mobility requirements of the handheld GPS positioning terminal.
Description
Technical Field
The present utility model relates generally to the field of power management, and in particular, to a power management device for a positioning terminal and a positioning terminal.
Background
A common GPS positioning system is typically composed of three independent parts: space satellite, ground signal station and user terminal equipment, space satellite includes M working satellites and 3 spare satellites. The ground signal stations include 1 master station, 3 injection stations, and 5 monitoring stations. The user terminal equipment receives GPS satellite transmitting signals to obtain necessary navigation and positioning information, and the navigation and positioning work is completed through data processing, and the GPS receiver hardware generally consists of a host, an antenna and a power supply. The M GPS satellites run around the earth in a period of 12 hours at a high altitude of 1 ten thousand 2 km from the ground, so that more than 4 satellites can be observed at any point on the ground at any time. Considering the error between the satellite clock and the receiver clock, there are actually 4 unknowns, and thus, the 4 th satellite needs to be introduced, and 4 equations are formed to solve, so as to obtain the longitude, latitude and elevation of the observation point.
The hand-held GPS positioning terminal has certain requirements on power supply when in use. The handheld GPS positioning terminal needs to supply about 7.3V voltage during operation and then converts the voltage into different working voltages required by all components of the positioning terminal. When the positioning terminal is in a radio frequency transmission state, more than 4A of instantaneous current is needed to meet the high power requirement during radio frequency transmission, and when the positioning terminal is in a normal standby state, about 500mA of current is needed to meet the low power consumption requirement during standby, so that the endurance time of the positioning terminal is prolonged. In addition, the handheld GPS positioning terminal has certain requirements on mobility when in use, and the positioning terminal needs to be conveniently used in different working occasions such as indoor, vehicle-mounted and outdoor. For such power supply and mobility requirements of the handheld GPS positioning terminal, there is no suitable power supply and power management device on the market that can well meet these requirements, so a suitable power supply needs to be selected and a reasonably designed power management device is required to meet the power supply and mobility requirements of the handheld GPS positioning terminal.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model provides a power management device of a positioning terminal and the positioning terminal, so as to meet the power supply and mobility requirements of a handheld GPS positioning terminal.
According to an aspect of the present utility model, there is provided a power management apparatus of a positioning terminal for positioning a terminal, the power management apparatus comprising: a charging circuit connected to an external power supply device and a built-in power supply of the positioning terminal, for supplying a working power supply through the external power supply device and charging the built-in power supply; a power supply selection circuit connected to the charging circuit and the built-in power supply for comparing a voltage of the operating power supply with an output voltage of the built-in power supply to select the operating power supply or the built-in power supply to provide a power supply; and the voltage conversion circuit is connected with the power supply selection circuit and used for converting the power supply into load output voltage.
In one embodiment, the charging circuit includes a charging protection circuit and a charging management circuit, an input end of the charging protection circuit is connected with an output end of the external power supply device, an output end of the charging protection circuit is connected with the charging management circuit and the power supply selection circuit respectively, the charging management circuit includes a charging management chip, and the built-in power supply is connected with the charging management chip.
In one embodiment, the charging circuit further comprises a voltage detection circuit connected to the built-in power supply and the charging management circuit for detecting a voltage output by the built-in power supply to be fed back to the charging management circuit.
In one embodiment, the power supply selection circuit comprises a voltage comparison circuit and a switch circuit, wherein the input end of the voltage comparison circuit is respectively connected with the power supply protection circuit and the output end of the built-in power supply, the output end of the voltage comparison circuit is connected with the input end of the switch circuit, and the output end of the switch circuit is connected with the voltage conversion circuit.
In one embodiment, the voltage conversion circuit includes at least one step-down circuit, the input ends of the at least one step-down circuit are all connected with the output end of the switch circuit, and the output end of the at least one step-down circuit is connected with the load component of the positioning terminal to supply power to the load component.
In one embodiment, the voltage conversion circuit includes two 5V buck circuits and one 3.3V buck circuit.
In one embodiment, the external power source comprises a power adapter or a mobile power source.
In one embodiment, the positioning terminal further comprises a display screen, and the electric quantity state of the built-in power supply is displayed on the display screen.
In one embodiment, the positioning terminal further comprises a charge status indicator light to indicate a charge status of the built-in power supply.
According to a second aspect of the present utility model, there is provided a positioning terminal comprising a built-in power supply and a power management device of the positioning terminal according to the first aspect of the present utility model.
The technical scheme of the utility model has the following beneficial technical effects:
the power supply management device of the positioning terminal is provided with the power supply selection circuit, so that an external power supply or an internal power supply can be selected to supply power for the positioning terminal, and the voltage and the current of the external power supply or the internal power supply are converted into different working voltages required by all parts of the positioning terminal and working currents required by the positioning terminal in a radio frequency emission state and a standby state through the voltage conversion circuit, thereby meeting the power supply requirement of the positioning terminal;
through setting up power selection circuit and charging circuit in the power management device of locating terminal, can be through using the power adapter to supply power for the locating terminal and charge for the built-in power of locating terminal in indoor working scene, use portable power source to supply power for the locating terminal and charge for built-in power in on-vehicle working scene, use built-in power supply to supply power for the locating terminal in outdoor working scene, conveniently use the locating terminal under different working scenes to the mobility requirement of locating terminal has been satisfied.
Drawings
The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present utility model will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. In the drawings, embodiments of the utility model are illustrated by way of example and not by way of limitation, and like reference numerals refer to similar or corresponding parts and in which:
fig. 1 is a schematic structural view of a power management device of a positioning terminal according to an embodiment of the present utility model;
fig. 2 is a schematic diagram of a charge management circuit of a charge circuit of a power management device of a positioning terminal according to an embodiment of the present utility model;
fig. 3 is a schematic diagram of a charge protection circuit of a charge circuit of a power management device of a positioning terminal according to an embodiment of the present utility model;
fig. 4 is a schematic diagram of a 3.3V step-down circuit of a voltage conversion circuit of a power management device of a positioning terminal according to an embodiment of the present utility model;
FIG. 5 is a schematic diagram of a 5V step-down circuit of a voltage conversion circuit of a power management device of a positioning terminal according to an embodiment of the present utility model;
FIG. 6 is a schematic diagram of another 5V step-down circuit of the voltage conversion circuit of the power management device of the positioning terminal according to an embodiment of the present utility model;
fig. 7 is a schematic diagram of a voltage comparison circuit of a power selection circuit of a power management device of a positioning terminal according to an embodiment of the present utility model;
fig. 8 is a schematic diagram of a switching circuit of a power selection circuit of a power management device of a positioning terminal according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be understood that when the terms "first," "second," and the like are used in the claims, the specification and the drawings of the present utility model, they are used merely for distinguishing between different objects and not for describing a particular sequential order. The terms "comprises" and "comprising" when used in the specification and claims of the present utility model are taken to specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
According to a first aspect of the present utility model, there is provided a power management apparatus for a positioning terminal. Fig. 1 is a schematic diagram showing a structure of a power management apparatus of a positioning terminal according to an embodiment of the present utility model.
As shown in fig. 1, the power management device of the positioning terminal includes: a charging circuit, a power supply selection circuit and a voltage conversion circuit. The charging circuit is connected with an external power supply device and a built-in power supply of the positioning terminal and is used for providing a working power supply for the external power supply device and charging the built-in power supply, wherein the external power supply comprises a power supply adapter or a mobile power supply, and the built-in power supply can be a lithium ion battery. The power supply selection circuit is connected with the charging circuit and the built-in power supply and is used for comparing the voltage of the working power supply with the output voltage of the built-in power supply so as to select the working power supply or the built-in power supply to provide a power supply. The voltage conversion circuit is connected with the power supply selection circuit and used for converting the power supply into load output voltage.
The output end of the charging protection circuit is respectively connected with the charging management circuit and the power supply selection circuit, the charging management circuit comprises a charging management chip, and the built-in power supply is connected with the charging management chip. The charging circuit further comprises a voltage detection circuit which is connected with the built-in power supply and the charging management circuit and used for detecting the voltage output by the built-in power supply to feed back to the charging management circuit.
The power supply selection circuit comprises a voltage comparison circuit and a switching circuit, wherein the input end of the voltage comparison circuit is respectively connected with the output ends of the charging protection circuit and the built-in power supply, the output end of the voltage comparison circuit is connected with the input end of the switching circuit, and the output end of the switching circuit is connected with the voltage conversion circuit.
The voltage conversion circuit comprises at least one voltage reduction circuit, wherein the input end of the at least one voltage reduction circuit is connected with the output end of the switch circuit, and the output end of the at least one voltage reduction circuit is connected with the load component of the positioning terminal to supply power to the load component. The voltage conversion circuit may include two 5V step-down circuits and one 3.3V step-down circuit.
The positioning terminal can further comprise a display screen, and the electric quantity state of the built-in power supply is displayed on the display screen. The positioning terminal may further include a charge state indicator lamp to indicate a charge state of the built-in power supply.
Fig. 2 is a schematic diagram of a charge management circuit of a charge circuit of a power management device of a positioning terminal according to an embodiment of the present utility model. As shown in fig. 2, the charge management circuit includes a charge management chip D3, the charge management chip D3 is connected to a gate of a field effect transistor (MOSFET) D2 through a DRV pin, the charge management chip is connected to a charge protection circuit through a capacitor C6 to receive a voltage vin_2 therefrom through a VG pin, the charge management chip is connected to a green LED indicator led_q3_green and a red LED indicator led_q3_red through a CHRG pin and a DONE pin, the charge management chip is connected to a battery connector X1 through a resistor R1 through a CSP pin, and the charge management chip is connected to a voltage detection circuit to receive a voltage bat_adcv therefrom through a FB pin. The green LED indicator light LED_Q3_green and the red LED indicator light LED_Q3_red indicate the charging state of the built-in power supply. When the built-in power supply is in a charging state, the red LED indicator lamp LED_Q3_red is lighted; when the built-in power supply is fully charged, the green LED indicator lamp LED_Q3_green is lighted. BAT_ADCV is input from a voltage feedback input connected to a voltage detection circuit, which may be a voltage divider circuit, to detect the voltage of the built-in power supply BAT_ADCV. The field effect transistor D2 is connected to an input terminal of the low VF schottky barrier rectifier D1 through a drain electrode, and an output terminal of the low VF schottky barrier rectifier D1 is connected to the resistor R1 through the inductor L1 and further connected to the battery connector X1. The built-in power supply can be a lithium ion battery, the voltage of the built-in power supply is 7.3V, and the capacity of the built-in power supply is 5Ah. When the built-in power supply is charged, current flows from the power adapter or the mobile power supply through the charging connector X2 to sequentially form VIN_1 and VIN_2, and finally flows to the built-in power supply through the battery connector X1 to charge the built-in power supply. In an indoor scenario, a power adapter may be used to power the positioning terminal and to charge the built-in power supply. The power adapter can be an AC 220V-DC 12V/3A adapter. In a vehicle-mounted scene, a mobile power supply can be used for charging the positioning terminal, the voltage provided by the mobile power supply is 12V, and the battery capacity is 20Ah. The mobile power supply can provide working voltage for the handheld positioning terminal while charging. The charging management chip is used for switching the back plate lithium ion battery power supply and the mobile power supply, the internal ADC of the chip is used for sampling electric quantity, the internal function of the chip is used for controlling charging current, and protection is set. The operations are realized by reading and writing the internal register of the control chip through the I2C interface, so that the long-distance transportation task can be completed.
Fig. 3 is a schematic diagram of a charge protection circuit of a charge circuit of a power management device of a positioning terminal according to an embodiment of the present utility model. As shown in fig. 3, the charge protection circuit includes a charge connector X2. The charging connector X2 is connected to and receives the voltage vin_1 from the power adapter, connects the overcurrent protection fuses F1 and F3 connected in parallel with each other through the pin 1, and further connects the transient suppression diode VD1 and one ends of the capacitors C3, C4, and C5 connected in parallel with each other. The charging connector X2 is grounded through pins 2, 3, 4 and 5, and the other ends of the transient suppression diode VD1 and the capacitors C3, C4 and C5 are grounded, respectively. The input ends of the over-current protection fuses F1 and F3 are connected with the charging connector X2, and the output ends of the over-current protection fuses F1 and F3 are respectively connected with the voltage comparison circuit of the charging management circuit and the power supply selection circuit and provide voltage VIN_2 for the voltage comparison circuit.
Fig. 4 is a schematic diagram of a 3.3V step-down circuit of a voltage conversion circuit of a power management device of a positioning terminal according to an embodiment of the present utility model, fig. 5 is a schematic diagram of one 5V step-down circuit of the voltage conversion circuit of the power management device of a positioning terminal according to an embodiment of the present utility model, and fig. 6 is a schematic diagram of another 5V step-down circuit of the voltage conversion circuit of the power management device of a positioning terminal according to an embodiment of the present utility model. The three voltage-reducing circuits are similar in structure and comprise voltage-reducing chips D4, D7 or D25. The step-down chips D4, D7 and D25 are connected with a switching circuit of the power supply selection circuit through a pin VIN to receive the voltage VCC_2 from the step-down chips, and are connected with a load assembly through a pin VOUT and through inductors L2, L3 and L8 to output 3.3V, 5V and 5V voltages to the step-down chips respectively, wherein the load capacity of the two paths of 5V step-down circuits is high, and the current is high. The PG pins of buck chips D4, D7 and D25 represent good power supplies, and the pull-up resistor can be connected to any voltage less than 6V. After the power-on, the PG pin is kept in a low-resistance state, and when the output voltage reaches more than 83% of the rated voltage stabilizing value, the PG pin enters a high-resistance state. After the resistors are pulled up, when the voltage output of VDD_3V3 and VDD_5V is unstable, the PG pin outputs a low level, and after the voltage output is stable, the PG pin outputs a high level.
Fig. 7 is a schematic diagram of a voltage comparison circuit of a power selection circuit of a power management device of a positioning terminal according to an embodiment of the present utility model. As shown in fig. 7, the voltage comparison circuit includes a monitor and reset chip D5. The monitor and reset chip D5 receives the voltage vcc_bat from the built-in power supply through the VIN pin, the GATE pin through the field effect transistor (MOSFET) D6, and the voltage vin_2 through the SENSE pin through the transient suppression diode VD 2. The field effect transistor D6 is conducted unidirectionally, supports 5A current, only allows the current of the charging voltage VIN_2 to pass through the transient suppression diode VD2, and does not allow the current corresponding to the built-in power supply voltage VCC_BAT to flow to the charging protection circuit through the transient suppression diode VD 2. The drain of the transient suppression diode VD2 is connected to the switching circuit and supplies a voltage vcc_1 thereto.
Fig. 8 is a schematic diagram of a switching circuit of a power selection circuit of a power management device of a positioning terminal according to an embodiment of the present utility model. As shown in fig. 8, the switch circuit includes a switch SW1, one end of the switch SW1 is connected to the voltage comparing circuit to receive the voltage vcc_1 therefrom, and the other end of the switch SW1 is connected to the overvoltage protection fuses F2 and F4 connected in parallel to each other and further connected to the input end of the step-down circuit to supply the voltage vcc_2 thereto. The switch SW1 is connected to the switch connector X9, and the switch SW1 is fixed to the side of the device case and connected to the circuit through the switch connector X9. Switch SW1 controls whether the positioning device is powered up, and when SW1 is closed, vcc_2=vcc_1. The switch can be a boat-shaped switch.
In some embodiments, the positioning terminal further includes a display screen, where the power status of the built-in power supply, such as a percentage of remaining power, is displayed on the display screen. When the load component of the positioning terminal is in a low-power working state for a preset time, the display screen is extinguished to reduce power consumption, so that the endurance time of the positioning terminal when the built-in power supply supplies power is prolonged.
In summary, the power management device of the positioning terminal of the present utility model includes a charging circuit, a power selection circuit and a voltage conversion circuit, which are sequentially connected, when the positioning terminal works in an outdoor working scenario, a vehicle-mounted working scenario or an indoor working scenario, the charging circuit is respectively connected with a built-in power supply, a mobile power supply or a power adapter of the positioning terminal, the power selection circuit switches a path corresponding to the built-in power supply, the mobile power supply or the power adapter, and the voltage conversion circuit outputs corresponding working voltage and working current to supply power to a load component of the positioning terminal, thereby meeting the power supply and mobility requirements of the positioning terminal.
According to a second aspect of the present utility model, there is also provided a positioning terminal comprising a built-in power supply and a power management device of the positioning terminal according to one or more of the above-described embodiments of the first aspect of the present utility model.
It will be further understood by those skilled in the art from the foregoing description of the present specification that terms such as "upper," "lower," and the like, which indicate an orientation or a positional relationship, are based on the orientation or positional relationship shown in the drawings of the present specification, are for convenience only in describing aspects of the present utility model and simplifying the description, and do not explicitly or implicitly refer to devices or elements that must have the particular orientation, be constructed and operated in the particular orientation, and thus the above orientation or positional relationship terms should not be interpreted or construed as limiting aspects of the present utility model.
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 utility model, which are described in detail and are not to be construed as limiting the scope of the claims. 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 utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (10)
1. A power management apparatus for a positioning terminal, the power management apparatus comprising:
a charging circuit connected to an external power supply device and a built-in power supply of the positioning terminal, for supplying a working power supply through the external power supply device and charging the built-in power supply;
a power supply selection circuit connected to the charging circuit and the built-in power supply for comparing a voltage of the operating power supply with an output voltage of the built-in power supply to select the operating power supply or the built-in power supply to provide a power supply;
and the voltage conversion circuit is connected with the power supply selection circuit and used for converting the power supply into load output voltage.
2. The power management apparatus of a positioning terminal according to claim 1, wherein the charging circuit includes a charging protection circuit and a charging management circuit, an input terminal of the charging protection circuit is connected to an output terminal of the external power supply device, an output terminal of the charging protection circuit is connected to the charging management circuit and the power selection circuit, respectively, the charging management circuit includes a charging management chip, and the built-in power supply is connected to the charging management chip.
3. The power management apparatus of a positioning terminal according to claim 2, wherein the charging circuit further comprises a voltage detection circuit connected to the built-in power supply and the charging management circuit for detecting a voltage output from the built-in power supply to be fed back to the charging management circuit.
4. The power management apparatus of a positioning terminal as set forth in claim 2, wherein the
The power supply selection circuit comprises a voltage comparison circuit and a switch circuit, wherein the input of the voltage comparison circuit
The terminal is respectively connected with the output ends of the charging protection circuit and the built-in power supply, the output end of the voltage comparison circuit is connected with the input end of the switching circuit, and the output end of the switching circuit is connected with the voltage conversion circuit.
5. The power management apparatus of a positioning terminal as set forth in claim 4, wherein said
The voltage conversion circuit comprises at least one voltage reduction circuit, and the input end of the at least one voltage reduction circuit
Are all connected with the output end of the switch circuit, and the output end of the at least one voltage reduction circuit is connected with
The load components of the positioning terminal are connected to supply power thereto.
6. The power management apparatus of a positioning terminal of claim 5, wherein the voltage conversion circuit comprises two 5V step-down circuits and one 3.3V step-down circuit.
7. The power management apparatus of a positioning terminal according to claim 1, wherein the external power source comprises a power adapter or a mobile power source.
8. The power management device of a positioning terminal of claim 1, further comprising a display screen on which a state of charge of the built-in power supply is displayed.
9. The power management device of a positioning terminal of claim 1, wherein the positioning terminal further comprises a state of charge indicator light to indicate a state of charge of the built-in power supply.
10. A positioning terminal, characterized by comprising a built-in power supply and a power management device of the positioning terminal according to any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223185208.4U CN219801912U (en) | 2022-11-25 | 2022-11-25 | Power management device of positioning terminal and positioning terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223185208.4U CN219801912U (en) | 2022-11-25 | 2022-11-25 | Power management device of positioning terminal and positioning terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219801912U true CN219801912U (en) | 2023-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223185208.4U Active CN219801912U (en) | 2022-11-25 | 2022-11-25 | Power management device of positioning terminal and positioning terminal |
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| Country | Link |
|---|---|
| CN (1) | CN219801912U (en) |
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2022
- 2022-11-25 CN CN202223185208.4U patent/CN219801912U/en active Active
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