CN219740620U - Beidou No. three RDSS mobile phone back clamp - Google Patents

Abstract

The embodiment of the utility model discloses a Beidou No. three RDSS mobile phone back clamp which comprises an MCU, an RDSS short message module, a power management module, a battery, an RDSS antenna and a USB C-type interface for connecting a mobile phone, wherein the MCU is electrically connected with the RDSS short message module, the USB C-type interface and the power management module, the power management module is electrically connected with the battery, the RDSS short message module is connected with the RDSS antenna, and the USB C-type interface is connected with the power management module. According to the utility model, the USB C interface of the mobile phone is utilized to realize the organic combination of the Beidou III RDSS mobile phone back clip and the public network mobile phone, so that the public network mobile phone and the RDSS short message back clip are separated and can be used in a plug-and-play manner, the mobile phone is damaged, the back clip is not influenced, the mobile phone can be continuously used after being replaced by a new mobile phone, the resource waste is avoided, and the expenditure of consumers on the RDSS product is saved.

Description

Beidou No. three RDSS mobile phone back clamp

Technical Field

The utility model relates to the technical field of short message communication, in particular to a Beidou No. three RDSS mobile phone back clip.

Background

The space section of the Beidou No. three satellite navigation system consists of 5 static orbit satellites and 30 non-static orbit satellites, and provides two service modes, namely open service and authorized service. The open service is to provide positioning, speed measuring and time service in the service area freely, the positioning precision is 10 meters, the time service precision is 50 nanoseconds, and the speed measuring precision is 0.2 meters/second. The authorization service provides safer positioning, speed measurement, timing and communication services and system integrity information for authorized users. The first line of the world supporting Beidou No. three RDSS area short message communication service is formally issued for mobile phones in 2022 and 11 months.

The RDSS area short message communication mobile phone of the mobile phone only realizes a single-shot function and does not have a receiving function, and the implementation mode is that the RDSS area short message single-shot function is completed by a Beidou satellite and ground network base station mode, and the implementation mode is as follows:

1. integrating a 4G module and an RDSS short message module on a mobile phone main board, and setting an emergency contact ground public network telephone number in a mobile phone RDSS short message APP;

2. when a user needs to send a short message, the RDSS short message APP needs to be opened firstly to collect stars, after the stars are collected, the short message content is edited, the RDSS short message module sends the short message to the Beidou satellite through the RDSS antenna, after receiving the short message, the satellite forwards the short message information to a ground gateway station, the gateway station forwards the short message information to a ground network base station, and the ground network base station forwards the short message information to an emergency contact telephone number;

from the above discussion, it can be seen that implementing the RDSS short message function for the RDSS mobile phone requires a ground public network to join, and the RDSS short message function can only be implemented in a single shot and cannot be received, and the integration of the RDSS short message communication function and the mobile phone motherboard also causes great resource waste for the user, and once the mobile phone is broken, the short message function cannot be used. The disadvantages of current RDSS handsets are as follows:

1. the RDSS module of the existing RDSS mobile phone is integrated with the main board, and once the mobile phone is damaged or a user wants to replace the mobile phone, the cost of the RDSS function is equivalent to the loss of the user;

2. the current RDSS mobile phone only realizes a single-shot function and cannot receive short messages.

Disclosure of Invention

The technical problem to be solved by the embodiment of the utility model is to provide the Beidou No. three RDSS mobile phone back clamp so as to separate mobile phones from RDSS short message back clamp products.

In order to solve the technical problems, the embodiment of the utility model provides a Beidou III RDSS mobile phone back clamp, which comprises an MCU, an RDSS short message module, a power management module, a battery, an RDSS antenna and a USB C-type interface for connecting the mobile phone, wherein the MCU is electrically connected with the RDSS short message module, the USB C-type interface and the power management module, the power management module is electrically connected with the battery, the RDSS short message module is connected with the RDSS antenna, and the USB C-type interface is connected with the power management module.

Further, the TCXO crystal oscillator is electrically connected with the MCU and provides a 26MHz reference clock for the MCU.

Further, the electric quantity display LED is electrically connected with the MCU and used for displaying electric quantity.

Further, the power management module also comprises a power on/off key electrically connected with the power management module.

Further, the power management module consists of an RDSS short message module power supply circuit, an MCU power supply circuit, a battery charging circuit and a switching circuit.

Further, the system also comprises a SIM card connected with the RDSS short message module.

The beneficial effects of the utility model are as follows: the utility model uses the mobile phone back clip mode to connect through the mobile phone USB interface mode, thus realizing the separation of mobile phone and RDSS short message back clip products, plug and play, the mobile phone is broken, the back clip is not affected, and the mobile phone can be used continuously after being replaced by a new mobile phone, thereby avoiding the waste of resources.

Drawings

Fig. 1 is a schematic block diagram of a Beidou No. three RDSS handset back clamp in accordance with an embodiment of the present utility model.

Fig. 2 is a circuit diagram of an RDSS short message module in accordance with an embodiment of the present utility model.

Fig. 3 is a circuit diagram of a power management module according to an embodiment of the utility model.

Fig. 4 is a partial circuit diagram of an MCU according to an embodiment of the present utility model.

Fig. 5 is a functional block diagram of the RDSS short message sending and receiving functions of an embodiment of the present utility model.

Fig. 6 is a functional block diagram of a power-on/off of an embodiment of the present utility model.

Fig. 7 is a charging schematic block diagram of an embodiment of the present utility model.

Fig. 8 is a schematic block diagram of power display according to an embodiment of the present utility model.

Fig. 9 is a firmware download schematic block diagram of an embodiment of the present utility model.

Description of the embodiments

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other, and the present utility model will be further described in detail with reference to the drawings and the specific embodiments.

In the embodiment of the present utility model, if there is a directional indication (such as up, down, left, right, front, and rear … …) only for explaining the relative positional relationship, movement condition, etc. between the components in a specific posture (as shown in the drawings), if the specific posture is changed, the directional indication is correspondingly changed.

In addition, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implying an indication of the number of features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.

Referring to fig. 1, the beidou No. three RDSS mobile phone back clamp in the embodiment of the present utility model mainly comprises 9 parts including a Microprocessor (MCU), a TCXO crystal oscillator, an RDSS short message module, a power management module, a battery, an electric quantity display LED, a USB C-type interface, a start key, and an RDSS antenna.

Microprocessor (MCU): the MCU is mainly used for protocol processing, data transmission and control.

TCXO crystal oscillator: the MCU chip is provided with a 26MHz reference clock.

RDSS short message module: the receiving and transmitting functions of the Beidou No. three RDSS short text are mainly realized.

And a power management module: the functions of battery charging, RDSS short message module power supply, MCU power supply, on-off processing and the like are mainly realized.

A battery: and a power supply of the whole machine.

Electric quantity display LED: the battery power shows that 4 LEDs are bright to represent 100% of the power, 3 LEDs are bright to represent 75% of the power, 2 LEDs are bright to represent 50% of the power, and 1 LED is bright to represent 25% of the power.

USB C interface: the interface for communication with the mobile phone is multiplexed as a battery charging interface, and can be connected with the mobile phone through a wire (data wire).

On-off key: and when the power-on key is pressed for 2s manually for a long time, triggering a power-on interrupt signal, enabling the power management module to provide power supply voltage for the MCU and the RDSS short message module, enabling the MCU and the RDSS short message module to be started, and enabling the power management module to close the MCU and the RDSS short message module to provide power supply voltage after the power management module is pressed for 2s again, and enabling the MCU and the RDSS short message module to be shut down.

RDSS antenna: the RDSS signal receiving and transmitting module is used for receiving and transmitting RDSS signals of the Beidou navigation system.

The circuit of the RDSS short message module is shown in fig. 2, and consists of an RDSS short message module transmitting circuit and an RDSS short message module receiving circuit.

In the RDSS short message module transmitting circuit, because the 5W power amplifier is integrated inside the short message module, no additional power amplifying device is needed when the peripheral circuit of the module is designed, so the 19 th pin of the RDSS short message module can be directly connected with the RDSS transmitting antenna.

In the RDSS short message module receiving circuit, the RDSS module is integrated with a low noise amplifier and an acoustic surface filter to improve satellite signal receiving quality, so that the RDSS module can be directly connected with an RDSS receiving antenna.

The power supply voltage of the RDSS short message module is VDD5V_RD, and the power supply voltage is provided by the power management module.

The RDSS short message module supports a satellite SIM card protocol, the satellite SIM card can be connected by externally adding an SIM card, and the power supply voltage SIM_VCC of the SIM is provided by the module.

The RDSS short message module is communicated with the MCU through the UART0 serial ports RD_TXD0 and RD_RXD0, and comprises program downloading of the RDSS short message module, ephemeris data transmission of the RDSS short message module and the like.

The circuit of the power management module is shown in fig. 3, and the voltage management module mainly comprises three partial circuits, namely an RDSS short message module power supply circuit, an MCU power supply circuit, a battery charging circuit and an on-off circuit.

The power supply circuit of the RDSS short message module adopts a TPS563231 DCDC chip to boost the voltage of the lithium battery to 5V, and supplies power to the RDSS short message module.

The MCU power supply circuit adopts an ME6231C33M5G LDO chip, and the LDO outputs 3.3V voltage to supply to the MCU.

The charging chip of the battery charging circuit adopts a SY6970QCC charging chip, the chip charges the lithium battery through 5V voltage input by a TYPE-C interface, the charging chip supports an IIC protocol, the MCU communicates with the charging chip through the IIC interface, and the control of the charging chip is realized through the IIC interface; the STAT pin of the charging chip is a charging state indication pin, the pin is output low level in the charging process, and the pin is output high level when the charging is completed; an INT pin of the charging chip is a charger insertion indication pin, when the charger is inserted, the pin outputs a low level, and when the charger is pulled out, the pin outputs a high level; the charging chip CE is a charging enabling pin, the MCU controls the charging chip to enable through a charger_EN signal, and the pin is effective at low level; the NTC pin of the charging chip is a battery temperature monitoring pin and is connected with the NTC pin of the battery; the VBUS pin of the charging chip is a charging voltage input pin and is connected with the VBUS pin of TYTYTY-C; the BAT pin of the charging chip is connected with the positive electrode of the level; the VSYS pin of the charging chip is a system voltage output pin and supplies power for the MCU.

The on-off circuit adopts an LTC2954 chip, a switch key is connected with a PB pin of the LTC2954 chip, an EN pin of the LTC2954 chip is connected with an EN pin of the U10 to control the output of the U10, a 2 pin of the LTC2954 chip is used for debugging on-off time delay, and a 4 pin is used for adjusting off-off time delay.

As shown in FIG. 4, a part of the MCU circuit is shown, the device Y2 is a 26MHz crystal oscillator, and a reference clock is provided for the MCU; the device Y1 is a 32KHz crystal and provides a real-time clock reference for the MCU.

The device U1 is MCU, and U1's 4, 5, 7, 8 pins are electric quantity indicator lamp control pin, and the quantity of lighting through control LED lamp represents current battery power, and 1 lamp is lighted and is 25% current battery power, and 2 lamps are lighted and are represented 50%, and 3 lamps are lighted and are represented 75%, and 4 lamps are lighted and are represented 100%.

The U1 has pins 9, 10, 11, 12 and 13 as charging chip control pins, 9 as charger plug monitoring, 10 as charging enabling pin, 11 as charging state indicating pin, 12 and 13 as configuration and reading charging chip register pins, and the battery charging current configuration, battery electric quantity reading and other functional registers are realized through the pins 12 and 13.

The pins 14, 15, 16 and 17 of U1 are control pins of the RDSS short message module, the pins 14 and 15 are serial communication functions, all communication information and commands of the RDSS short message module are transmitted through serial ports, the pin 16 is a firmware upgrade control pin of the RDSS short message module, and the pin 17 is a power supply enabling pin of the RDSS short message module.

The pins 29, 30 and 31 of U1 are USB function pins, the pin 29 is a USB Bus power supply voltage input pin, the same power supply is used with MCU power supply voltage, the pins 30 and 31 are USB data communication pins, and the pins are connected with USB_D+ and USB_D-pins of a TYPE-C connector.

The 32 and 33 pins of U1 are 32K real-time clock input and output pins, which are connected with an external 32KHz crystal.

The 26 pin of U1 provides power supply voltage for an external 26MHz crystal oscillator, and the 27 pin is a 26MHz reference clock input pin.

The pins 3, 6 and 21 of the U1 are power input pins of the U1, and the power supply voltage is provided by the power management module.

The functional block diagram of the RDSS short message sending and receiving function of the utility model is shown in figure 5, and the principle is as follows:

A. RDSS short message transmission

When a public network mobile phone sends short messages to other RDSS short message users, firstly, the RDSS mobile phone back clamp is started and connected to the public network mobile phone through a USB C interface, when the RDSS mobile phone back clamp is connected to the public network mobile phone, a USB_CC pin of the USB C interface of the public network mobile phone is pulled down, and then the public network mobile phone can detect that the connection of the RDSS mobile phone back clamp is finished;

opening an RDSS short message APP of a public network mobile phone, setting short message content to be sent in the APP, selecting a receiving user, and clicking to send;

the short message content set in the APP is sent to the MCU through the USB C interface of the public network mobile phone by using a standard USB transmission protocol;

the MCU sends the short message content to the RDSS short message module through a serial port UART_TX pin;

after receiving the short message information, the RDSS short message module modulates the short message information to an RDSS L frequency band carrier wave through an RDSS protocol, and then sends the short message information to a Beidou No. three satellite through an RDSS antenna.

B. RDSS short message reception

The RDSS short message receiving is just opposite to the transmitting, the output signal of the Beidou No. three satellite is an S frequency band signal, after the RDSS antenna receives the S frequency band short message signal sent by the Beidou No. three satellite, the signal is sent to the RDSS short message module, the RDSS short message module demodulates the signal through an RDSS protocol after receiving the signal, the RDSS short message module sends the demodulated information to the MCU through a serial port UART_RX pin, and the MCU receives the information and sends the information to the public network mobile phone through a USB interface.

The switching on and switching off principle of the utility model is shown in fig. 6.

Starting up operation: when the battery power of the Beidou No. three RDSS mobile phone back clamp is more than 25%, the on-off key is pressed for more than 2 seconds, the on-off chip outputs an EN enabling signal to control the LDO to output MCU power supply voltage to supply power to the MCU, the MCU controls the DCDC to output 5V voltage to supply power to the RDSS short message module through an RD_EN signal after being started, the MCU and the RDSS short message module are used for providing power supply voltage to execute a starting-up flow, no additional enabling control is needed, and the MCU and the RDSS short message module automatically operate RDSS protocols and custom protocols after being started up;

shutdown operation: after the back clamp of the Beidou No. three RDSS mobile phone is started, the on-off key is pressed for more than 2s, the on-off chip outputs an EN enabling signal to close the LDO, the MCU is directly shut down after losing the power supply voltage, and the RD_EN signal output by the MCU is low in level under the condition that the MCU is shut down because a pull-down resistor is added during circuit design, so that the DCDC is in a closed state, 5V power supply voltage cannot be output, and the RDSS short message module cannot be started and is in a closed state.

The charging principle of the utility model is shown in fig. 7, the power management module integrates a battery charging chip, and the MCU configures a charging chip register through an I2C interface and sets parameters such as charging current, charging voltage and the like when the startup software is initialized. When the battery exists and the charging adapter is inserted into the USB C interface, the charging adapter provides 5V charging voltage, the power management module outputs MCU power supply voltage after receiving the 5V charging voltage, and the MCU starts to initialize the charging chip after being started up and performs charging flow control.

After the battery is charged, a charging chip in the power management module outputs a STAT interrupt signal to inform the MCU that the current charging is completed.

The electric quantity display principle of the utility model is shown in fig. 8, and the charging chip of the utility model is integrated with an ADC analog-digital converter, and reads the electric quantity of the battery through the ADC when the battery exists. When the battery exists, when the battery power is inquired, the switch chip outputs an EN enabling signal to control the LDO to output the MCU power supply voltage, the starting process is executed, in the starting process, the MCU controls a charging IC in the power management module to read the battery power through an I2C interface, after the MCU reads the battery power, the MCU controls 4 GPIOs to respectively light 4 LED lamps, the 4 LEDs are lighted to show that the current battery power is 100%, the 3 LEDs are lighted to show that the current battery power is 75%, the 2 LEDs are lighted to show that the current battery power is 50%, and the 1 LED is lighted to show that the current battery power is 25%.

The firmware download principle of the present utility model is shown in fig. 9.

A. MCU firmware download

After the USB C interface of the RDSS mobile phone back clamp is connected to the PC through a USB line, running upper computer software to download firmware, clicking the MCU to download firmware option, and then selecting the firmware to be downloaded to directly update the MCU firmware;

B. RDSS short message module firmware download

After the USB C interface of the RDSS mobile phone back clamp is connected to the PC through the USB line, the upper computer software is operated to download the firmware, after the firmware is downloaded by clicking the RDSS short message module, the MCU pulls up the UPDATA pin to control the RDSS short message module to enter a boot mode, the MCU downloads the firmware to the MCU cache through the USB C interface, and then the firmware is forwarded to the RDSS short message module through the UART serial port, so that the firmware downloading function of the RDSS short message module is realized.

According to the utility model, the USB C interface of the mobile phone is utilized to realize the organic combination of the Beidou III RDSS mobile phone back clip and the public network mobile phone, so that the public network mobile phone and the RDSS short message back clip are separated and can be used in a plug-and-play manner, the mobile phone is damaged, the back clip is not influenced, the mobile phone can be continuously used after being replaced by a new mobile phone, the resource waste is avoided, and the expenditure of consumers on the RDSS product is saved.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the utility model as defined by the appended claims and their equivalents.

Claims (6)

1. The Beidou No. three RDSS mobile phone back clamp is characterized by comprising an MCU, an RDSS short message module, a power management module, a battery, an RDSS antenna and a USB C-type interface for connecting a mobile phone, wherein the MCU is electrically connected with the RDSS short message module, the USB C-type interface and the power management module, the power management module is electrically connected with the battery, the RDSS short message module is connected with the RDSS antenna, and the USB C-type interface is connected with the power management module.

2. The Beidou No. three RDSS mobile phone back clamp of claim 1, further comprising a TCXO crystal oscillator electrically connected with the MCU for providing the MCU with a 26MHz reference clock.

3. The Beidou No. three RDSS mobile phone back clamp of claim 1, further comprising an electric quantity display LED electrically connected with the MCU for displaying electric quantity.

4. The Beidou No. three RDSS handset back clamp of claim 1, further comprising an on-off key electrically connected with the power management module.

5. The Beidou No. three RDSS mobile phone back clamp of claim 4, wherein the power management module consists of an RDSS short message module power supply circuit, an MCU power supply circuit, a battery charging circuit and a switch circuit.

6. The Beidou No. three RDSS handset back clamp of claim 1, further comprising a SIM card connected with the RDSS short message module.