CN212572081U - Positioning board antenna power supply switching circuit - Google Patents
Positioning board antenna power supply switching circuit Download PDFInfo
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- CN212572081U CN212572081U CN202020921681.6U CN202020921681U CN212572081U CN 212572081 U CN212572081 U CN 212572081U CN 202020921681 U CN202020921681 U CN 202020921681U CN 212572081 U CN212572081 U CN 212572081U
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- integrated circuit
- board card
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Abstract
The utility model provides a location integrated circuit board antenna power supply switching circuit, including change over switch, external power source, the inside power supply interface of GNSS location integrated circuit board pass through change over switch and the inside radio frequency signal biasing input voltage interface connection of GNSS location integrated circuit board, and radio frequency signal biasing input voltage interface passes through the inside inductance of GNSS location integrated circuit board and is connected with the signal input pin of active antenna. The utility model discloses an active antenna provides the power supply switching, through corresponding discrete components and parts and the inside logic circuit of GNSS location integrated circuit board, realizes that GNSS location integrated circuit board internal power source and external power source switch over each other for the function of active antenna power supply, can satisfy the active antenna power supply requirement of different voltages in the 3 ~ 6V interval, and the configuration is nimble, low cost, and reliability and stability are high.
Description
Technical Field
The utility model relates to a surveying and mapping technique field especially relates to a location integrated circuit board antenna power supply switching circuit.
Background
In the field of GNSS surveying and mapping, in order to achieve high-precision position location, a GNSS receiver system must have two important components, namely a GNSS antenna and a GNSS high-precision positioning board (or module). The GNSS antenna is the first device for processing satellite signals by a GNSS receiver, and converts received electromagnetic wave signals transmitted by GNSS satellites into voltage or current signals through functional circuits such as amplification and filtering, so that the radio frequency front end of the receiver can process the signals. The GNSS high-precision positioning board card converts voltage or current signals output by the GNSS antenna into digital signals, and finally the real-time position of the antenna is calculated through a corresponding algorithm.
GNSS antennas can be divided into two types, active and passive antennas, in this system. The passive antenna is a metal body, and various antennas which are common in common are commonly seen. For example, the plate antenna is mainly made of ceramic dielectric and is mostly square in design, and the larger the area is, the higher the resonance frequency is.
The active antenna is characterized in that an amplifier is added behind a common antenna, a power supply matched with the amplifier is provided, and the amplifier is used for improving the sensitivity and reducing the signal-to-noise ratio. The main components are passive antennas and LNAs (low noise signal modules). The LNA requires a power supply and is therefore called an active antenna.
The power supply for the active antenna is generally divided into an internal GNSS positioning board power supply and an external digital power supply. The internal GNSS positioning board is powered by a board radio frequency end which outputs 3-5V direct current voltage to supply power for the antenna. The external digital power supply is used for supplying power to the antenna by outputting 3-5V direct current voltage by a power circuit such as an LDO (low dropout regulator) or a DC-DC (direct current-direct current) and the like. Most GNSS positioning boards (or modules) can now power an antenna through their own rf interface, for example, the ubloxM8T module can output 3V50mA power to power an active antenna. The power supply voltage and the power supply current required to be input by part of the active antennas are different from the power supply parameters provided by the GNSS positioning board card. For example, the 3V50mA power supply output by the ubloxM8T module powers an active antenna with a 3V supply voltage input. When the supply voltage of the active antenna needs 5V, the ublox M8T module cannot meet the supply requirement. In order to adapt to antennas with different voltage and current loads and to conveniently control the antenna power supply, an external power supply is often required to supply power to the antenna. However, the GNSS positioning board card cannot automatically switch to an external power supply to supply power.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide a location integrated circuit board antenna power supply switching circuit for active antenna provides the power supply switching power supply, through corresponding discrete components and parts and the inside logic circuit of GNSS location integrated circuit board, realizes that GNSS location integrated circuit board internal power source and external power source switch over each other for the function of active antenna power supply.
The utility model provides a location integrated circuit board antenna power supply switching circuit, including change over switch, the inside power supply interface of external power source, GNSS location integrated circuit board passes through change over switch and the inside radio frequency signal biasing input voltage interface connection of GNSS location integrated circuit board, radio frequency signal biasing input voltage interface passes through the inside inductance of GNSS location integrated circuit board and is connected with the signal input pin of active antenna.
Furthermore, the change-over switch is a PMOS tube, an external power supply is connected with a grid electrode of the PMOS tube, a source electrode of the PMOS tube is connected with a power supply interface inside the GNSS positioning board card, and a drain electrode of the PMOS tube is connected with a radio frequency signal bias input voltage interface inside the GNSS positioning board card and the external power supply.
The power supply further comprises a first voltage-dividing resistor and a second voltage-dividing resistor, wherein an external power supply is connected with the grid electrode of the PMOS tube through the first voltage-dividing resistor, and the grid electrode of the PMOS tube is grounded through the second voltage-dividing resistor.
The GNSS positioning board card is characterized by further comprising a diode, an external power supply is connected with the anode of the diode, and the cathode of the diode is connected with the drain electrode of the PMOS tube and a radio frequency signal bias input voltage interface in the GNSS positioning board card.
Furthermore, a controller and a switch are further arranged in the GNSS positioning board card, a radio frequency signal bias input voltage interface in the GNSS positioning board card is connected with an inductor in the GNSS positioning board card through the switch, and the controller is connected with the switch.
Further, the external power supply is a 3-6V direct current stabilized power supply or a power supply obtained after DC-DC conversion.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model provides a location integrated circuit board antenna power supply switching circuit, including change over switch, external power source, the inside power supply interface of GNSS location integrated circuit board pass through change over switch and the inside radio frequency signal biasing input voltage interface connection of GNSS location integrated circuit board, and radio frequency signal biasing input voltage interface passes through the inside inductance of GNSS location integrated circuit board and is connected with the signal input pin of active antenna. The utility model discloses an active antenna provides the power supply switching, through corresponding discrete components and parts and the inside logic circuit of GNSS location integrated circuit board, realizes that GNSS location integrated circuit board internal power source and external power source switch over each other for the function of active antenna power supply, can satisfy the active antenna power supply requirement of different voltages in the 3 ~ 6V interval, and the configuration is nimble, low cost, and reliability and stability are high.
The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings. The detailed description of the present invention is given by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:
fig. 1 is the schematic diagram of the power supply switching circuit of the positioning board antenna of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.
The external power supply and the power supply interface inside the GNSS positioning board are connected with a radio-frequency signal bias input voltage interface inside the GNSS positioning board through the change-over switch, and the radio-frequency signal bias input voltage interface is connected with a signal input pin of an active antenna through an inductor inside the GNSS positioning board.
As shown in fig. 1, the switch is a PMOS transistor, the external power source LNA _ PWR is connected to the gate of the PMOS transistor Q1, the source of the PMOS transistor is connected to the internal power supply interface VCC _ RF of the GNSS positioning board, and the drain of the PMOS transistor is connected to the RF signal bias input voltage interface VCC _ ANT and the external power source LNA _ PWR inside the GNSS positioning board. In this embodiment, the GNSS positioning board supplies power to the active antenna through its own ublox M8T module U1, and the VCC _ RF pin of the ublox M8T module U1 outputs 3V50mA power voltage and current to supply power to the active antenna. The ublox M8T module U1 is also internally provided with a controller and a switch, wherein a radio frequency signal bias input voltage interface VCC _ ANT is connected with an inductor through the switch, the controller is connected with the switch, and the on-off relation between VCC _ ANT and an active antenna is controlled through the controller. The external power supply is a 3-6V direct current stabilized power supply or a power supply obtained after DC-DC conversion. The power supply requirements of the active antenna with different voltages in a range of 3-6V can be met.
In an embodiment, the voltage regulator further includes a first voltage-dividing resistor R1 and a second voltage-dividing resistor R2, the external power supply LNA _ PWR is connected to the gate of the PMOS transistor Q1 through the first voltage-dividing resistor R1, and the gate of the PMOS transistor Q1 is grounded through the second voltage-dividing resistor R2. In this embodiment, the resistance of R1 is 47k Ω, the resistance of R2 is 10k Ω, and when the external power supply LNA _ PWR is turned on, the gate of the MOS transistor is switched through the divided voltage of the two resistors. The GNSS positioning board card further comprises a diode D1, an external power supply LNA _ PWR is connected with the anode of the diode D1, and the cathode of the diode D1 is connected with the drain of the PMOS tube Q1 and a radio frequency signal bias input voltage interface VCC _ ANT inside the GNSS positioning board card. The diode D1 realizes that only the current is allowed to pass from the external power supply LNA _ PWR to VCC _ ANT in a single direction, and is blocked when the current is reversed, so that the safety of the circuit is protected.
The PMOS tube is a core device for switching a GNSS positioning board card power supply and an external power supply. When no external power supply supplies power, the grid electrode of the MOS tube is at a low level, the MOS tube is conducted, the VCC _ RF voltage of the module is connected with the VCC _ ANT pin, and the power is supplied to the active antenna through the inductor inside the module. When an external power supply is needed to supply power, the grid electrode of the MOS tube is at a high level, the MOS tube is cut off, VCC _ RF and VCC _ ANT are disconnected, the external power supply LNA _ PWR is connected with a VCC _ ANT pin through a diode D1, and the power is supplied to the active antenna through the inductor inside the module. Through low-cost electronic components: the MOS tube, the resistor and the diode realize the function of switching the internal part of the GNSS positioning board card and the external power supply to supply power for the active antenna by the hardware, and have the advantages of flexible configuration, low cost, high reliability and high stability.
The utility model provides a location integrated circuit board antenna power supply switching circuit, including change over switch, external power source, the inside power supply interface of GNSS location integrated circuit board pass through change over switch and the inside radio frequency signal biasing input voltage interface connection of GNSS location integrated circuit board, and radio frequency signal biasing input voltage interface passes through the inside inductance of GNSS location integrated circuit board and is connected with the signal input pin of active antenna. The utility model discloses an active antenna provides the power supply switching, through corresponding discrete components and parts and the inside logic circuit of GNSS location integrated circuit board, realizes that GNSS location integrated circuit board internal power source and external power source switch over each other for the function of active antenna power supply, can satisfy the active antenna power supply requirement of different voltages in the 3 ~ 6V interval, and the configuration is nimble, low cost, and reliability and stability are high.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way; the utility model can be smoothly implemented by the ordinary technicians in the industry according to the drawings and the above description; however, those skilled in the art should understand that changes, modifications and variations made by the above-described technology can be made without departing from the scope of the present invention, and all such changes, modifications and variations are equivalent embodiments of the present invention; meanwhile, any changes, modifications, evolutions, etc. of the above embodiments, which are equivalent to the actual techniques of the present invention, still belong to the protection scope of the technical solution of the present invention.
Claims (6)
1. The utility model provides a location integrated circuit board antenna power supply switching circuit which characterized in that: the GNSS positioning board card power supply system comprises a change-over switch, an external power supply and a GNSS positioning board card internal power supply interface are connected with a radio frequency signal bias input voltage interface inside the GNSS positioning board card through the change-over switch, and the radio frequency signal bias input voltage interface is connected with a signal input pin of an active antenna through an inductor inside the GNSS positioning board card.
2. The positioning board antenna power switching circuit of claim 1, wherein: the change-over switch is a PMOS tube, an external power supply is connected with a grid electrode of the PMOS tube, a source electrode of the PMOS tube is connected with a power supply interface inside the GNSS positioning board card, and a drain electrode of the PMOS tube is connected with a radio frequency signal bias input voltage interface inside the GNSS positioning board card and the external power supply.
3. The positioning board antenna power switching circuit of claim 2, wherein: the power supply circuit further comprises a first voltage-dividing resistor and a second voltage-dividing resistor, an external power supply is connected with the grid electrode of the PMOS tube through the first voltage-dividing resistor, and the grid electrode of the PMOS tube is grounded through the second voltage-dividing resistor.
4. The positioning board antenna power switching circuit of claim 2, wherein: the GNSS positioning board card is characterized by further comprising a diode, an external power supply is connected with the anode of the diode, and the cathode of the diode is connected with the drain electrode of the PMOS tube and a radio frequency signal bias input voltage interface in the GNSS positioning board card.
5. The positioning board antenna power switching circuit of claim 1, wherein: the GNSS positioning board card is internally provided with a controller and a switch, a radio frequency signal bias input voltage interface in the GNSS positioning board card is connected with an inductor in the GNSS positioning board card through the switch, and the controller is connected with the switch.
6. The positioning board antenna power switching circuit of claim 1, wherein: the external power supply is a 3-6V direct-current stabilized power supply or a power supply obtained after DC-DC conversion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020921681.6U CN212572081U (en) | 2020-05-27 | 2020-05-27 | Positioning board antenna power supply switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020921681.6U CN212572081U (en) | 2020-05-27 | 2020-05-27 | Positioning board antenna power supply switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212572081U true CN212572081U (en) | 2021-02-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020921681.6U Active CN212572081U (en) | 2020-05-27 | 2020-05-27 | Positioning board antenna power supply switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212572081U (en) |
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2020
- 2020-05-27 CN CN202020921681.6U patent/CN212572081U/en active Active
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