CN111049549A - Civil airborne WIFI system with BITE function - Google Patents
Civil airborne WIFI system with BITE function Download PDFInfo
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- CN111049549A CN111049549A CN201911188146.2A CN201911188146A CN111049549A CN 111049549 A CN111049549 A CN 111049549A CN 201911188146 A CN201911188146 A CN 201911188146A CN 111049549 A CN111049549 A CN 111049549A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/401—Circuits for selecting or indicating operating mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/1607—Supply circuits
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Abstract
The invention relates to an airborne WIFI system, in particular to a civil airborne WIFI system with a BITE function, which comprises a wireless communication and switch unit, a BITE unit and a power supply unit, wherein the wireless communication and switch unit is used for transmitting WiFi and controlling the opening and closing of an antenna, the BITE unit is connected with the wireless communication and switch unit and used for voltage detection, temperature detection and level conversion, and the power supply unit is used for supplying power to the wireless communication and switch unit and the BITE unit. The problem of current civilian machine-mounted WiFi equipment do not possess self-checking function, can not satisfy the relevant requirement of civilian aircraft to machine-mounted electronic equipment is solved.
Description
Technical Field
The invention relates to an airborne WIFI system, in particular to a civil airborne WIFI system with a BITE function.
Background
With the rapid development of wireless communication technology, the demand of the public society for using Portable Electronic devices, especially for use in airplanes, is becoming stronger, and research institutions and professional organizations in various countries have continuously researched the use of Portable Electronic Devices (PED) in airplanes. Aircraft manufacturers such as boeing and airbus also consider how to prevent PED interference during design and manufacturing. The Radio technical commission (Radio technical commission for aeronous, RTCA for short) issues an industry standard in turn, provides a technical specification of the anti-PED electromagnetic interference of the aircraft, and lays a foundation for further developing the use of PED on the aircraft.
In recent years, in order to meet the requirements of mass passengers, the civil aviation administration in China considers that the conditions for using the PED on the set-top machine are basically mature through a series of works such as technical tests, regulation revisions and the like according to the national conditions of China, and releases a 'usage evaluation guide of portable electronic equipment (PED) on the machine', thereby providing specific requirements and guidance for the airlines to verify and evaluate the usage of the portable electronic equipment on the machine.
The on-board communication includes front cabin (cockpit) communication and rear cabin communication, the latter being applied to cabin internet services. With the development of technologies such as mobile communication, satellite communication and the like, the technology for providing voice and data mobile communication services for passengers in the behavior of civil airliners is becoming mature day by day, and airborne WiFi is really needed for meeting the requirements of the passengers in many technologies.
With the complexity and integration of avionic devices, the maintenance of the airborne equipment of the civil aircraft is changed from being directed to the independent airborne electronic device to being based on an airborne maintenance system, but at present, the WIFI equipment of the civil aircraft does not have a self-detection function and cannot meet the relevant requirements of the civil aircraft on the airborne electronic device, namely, the airborne WIFI needs to be upgraded and modified to meet the relevant standard requirements of the aircraft, so that the aircraft is not interfered by wireless signals in the take-off process.
Disclosure of Invention
The invention aims to provide a civil airborne WIFI system with a BITE function, and solves the problems that existing civil airborne WiFi equipment does not have a self-detection function and cannot meet the relevant requirements of a civil airplane on airborne electronic equipment.
In order to solve the technical problems, the invention adopts the following technical scheme:
civil airborne WIFI system with BITE function comprises
The wireless communication and switch unit is used for transmitting WiFi and controlling the opening and closing of the antenna;
the BITE unit is connected with the wireless communication and switch unit and used for voltage detection, temperature detection and level conversion; and
and the power supply unit is used for supplying power to the wireless communication and switch unit and the BITE unit.
The technical scheme is that the power supply unit comprises a direct-current power supply, a positive high-voltage hot plug surge current control unit with power limitation and a DCDC power supply module, the direct-current power supply is connected with the DCDC power supply module through the positive high-voltage hot plug surge current control unit with power limitation, the DCDC power supply module is connected with the BITE unit and the switch unit through wireless communication, the positive high-voltage hot plug surge current control unit with power limitation is further connected with a voltage stabilizer, and the voltage stabilizer is connected with the BITE unit.
The technical scheme is that the BITE unit comprises an MCU, a voltage detection circuit, a temperature detection circuit and a level conversion circuit, the MCU is connected with the DCDC power module through the voltage detection circuit, and the MCU is connected with the wireless communication and switch unit through the voltage detection circuit, the temperature detection circuit and the level conversion circuit.
A further technical scheme is that the wireless communication and switch unit comprises a CPU2G chip, a CPU5G chip, an antenna control switch, a 2G antenna and a 5G antenna, wherein the CPU2G chip and the CPU5G chip are connected through a PCIE bus;
the CPU2G chip and the CPU5G chip are both connected with a DCDC power supply module, the CPU2G chip is connected with the MCU through a level conversion circuit, and the CPU2G chip and the CPU5G chip are both connected with the MCU through a voltage detection circuit and a temperature detection circuit;
the CPU2G chip is connected with the 2G antenna through an antenna control switch, and the CPU5G chip is connected with the 5G antenna through an antenna control switch.
The voltage detection circuit further comprises a VDD _2G _ CORE circuit, a VDD _ DDR circuit, a VDD _5G _ CORE circuit and a VDD _ SYSTEM circuit, wherein a VDD33_ VREF pin of the MCU is connected with the DCDC power module through the VDD _ SYSTEM circuit, a 5G _ VREF _11 pin of the MCU is connected with a CPU5G chip through the VDD _5G _ CORE circuit, a DDR _ VREF pin of the MCU is connected with a CPU2G chip through the VDD _ DDR circuit, and a 2G _ VREF _12 pin of the MCU is connected with a CPU2G chip through the VDD _2G _ CORE circuit.
The further technical scheme is that the Temperature detection circuit comprises a Temperature Detected _1 circuit and a Temperature Detected _2 circuit, the NTC _ VREF pin of the MCU is connected with the CPU2G chip through the Temperature Detected _1 circuit, and the NTC1_ VREF pin of the MCU is connected with the CPU5G chip through the Temperature Detected _2 circuit.
According to a further technical scheme, the antenna control SWITCH comprises TX/RX SWITCH and ANT SWITCH, the CPU2G chip or the CPU5G chip is connected with the TX/RX SWITCH through a filter, the TX/RX SWITCH is connected with ANTSWITCH, and the ANT SWITCH is connected with the 2G antenna or the 5G antenna.
According to a further technical scheme, the direct current power supply is further connected with a NOR circuit, and the NOR circuit is connected with ANTSWITCH.
The further technical scheme is that the CPU2G chip is connected with a PHY, and the PHY is connected with a GE _ RJ45 connector.
Compared with the prior art, the invention has the beneficial effects that: supply power through electrical unit, and then guarantee wireless communication and switch element and BITE unit's normal work, when BITE unit detects that the temperature value exceeds the upper limit of temperature or detects that the magnitude of voltage exceeds the upper limit of voltage, will transmit signal to electrical unit, make electrical unit no longer for wireless communication and switch element power supply, and then reduce the safety of entire system because of overheated or overvoltage leads to.
Drawings
Fig. 1 is a hardware block diagram of an onboard WiFi system in the present invention.
Fig. 2 is a circuit diagram of a power supply unit in the present invention.
FIG. 3 is a circuit diagram of a BITE cell of the present invention.
Fig. 4 is a circuit diagram of the wireless communication and switch unit of the present invention.
FIG. 5 is a schematic diagram of the present invention applied to a PCB.
FIG. 6 is a schematic diagram of an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example (b):
fig. 1 to 6 show a preferred embodiment of the civil airborne WIFI system with BITE function of the present invention, the civil airborne WIFI system with BITE function in this embodiment includes a wireless communication and switching unit, a BITE unit and a power supply unit, wherein the wireless communication and switching unit is used for transmitting WIFI and controlling the switching of the antenna, the BITE unit is connected with the wireless communication and switching unit for voltage detection, temperature detection and level conversion, and the power supply unit is used for supplying power to the wireless communication and switching unit and the BITE unit. As shown in fig. 2, the power supply unit includes a dc power supply, a positive high voltage hot plug surge current control unit with power limitation, and a DCDC power supply module, the dc power supply is connected to the DCDC power supply module through the positive high voltage hot plug surge current control unit with power limitation, the DCDC power supply module is connected to the BITE unit and the wireless communication and switching unit, the positive high voltage hot plug surge current control unit with power limitation is further connected to a voltage stabilizer, and the voltage stabilizer is connected to the BITE unit. As shown in FIG. 1, the BITE unit comprises an MCU, a voltage detection circuit, a temperature detection circuit and a level conversion circuit, the MCU is connected with the DCDC power module through the voltage detection circuit, and the MCU is connected with the wireless communication and switch unit through the voltage detection circuit, the temperature detection circuit and the level conversion circuit. The wireless communication and switch unit comprises a CPU2G chip, a CPU5G chip, an antenna control switch, a 2G antenna and a 5G antenna, wherein the CPU2G chip is connected with the CPU5G chip through a PCIE bus; the CPU2G chip and the CPU5G chip are both connected with the DCDC power supply module, the CPU2G chip is connected with the MCU through a level conversion circuit, and the CPU2G chip and the CPU5G chip are both connected with the MCU through a voltage detection circuit and a temperature detection circuit; the CPU2G chip is connected with the 2G antenna through the antenna control switch, and the CPU5G chip is connected with the 5G antenna through the antenna control switch. The voltage detection circuit comprises a VDD _2G _ CORE circuit, a VDD _ DDR circuit, a VDD _5G _ CORE circuit and a VDD _ SYSTEM circuit, a VDD33_ VREF pin of the MCU is connected with the DCDC power module through the VDD _ SYSTEM circuit, a 5G _ VREF _11 pin of the MCU is connected with a CPU5G chip through the VDD _5G _ CORE circuit, a DDR _ VREF pin of the MCU is connected with a CPU2G chip through the VDD _ DDR circuit, and a 2G _ VREF _12 pin of the MCU is connected with a CPU2G chip through the VDD _2G _ CORE circuit. The Temperature detection circuit comprises a Temperature Detected _1 circuit and a Temperature Detected _2 circuit, an NTC _ VREF pin of the MCU is connected with the CPU2G chip through the Temperature Detected _1 circuit, and an NTC1_ VREF pin of the MCU is connected with the CPU5G chip through the Temperature Detected _2 circuit. The dc power supply is also connected to a nor circuit, which is connected to ANT SWITCH. The CPU2G chip is connected to a PHY, which is connected to a GE _ RJ45 connector.
Supply power through electrical unit, and then guarantee wireless communication and switch element and BITE unit's normal work, when BITE unit detects that the temperature value exceeds the upper limit of temperature or detects that the magnitude of voltage exceeds the upper limit of voltage, will transmit signal to electrical unit, make electrical unit no longer for wireless communication and switch element power supply, and then reduce the safety of entire system because of overheated or overvoltage leads to.
The direct-current power supply provides direct-current input of DC24V-DC32V, the positive high-voltage hot-plug surge current control unit with power limitation adopts LM5069, the DCDC power supply module adopts MPQ4430, and the voltage stabilizer adopts LM 317.
As shown in FIG. 2, the DC power circuit comprises a DF50A-10P-1V (51) connector, an overheating fuse FB1 is connected to the 12 th pin of the DF50A-10P-1V (51) connector, the other end of the overheating fuse FB1 is grounded, an overheating fuse FB4 is connected to the 11 th pin of the DF50A-10P-1V (51) connector, the other end of the overheating fuse FB4 is grounded, the 1 st pin and the 2 nd pin of the DF50A-10P-1V (51) connector are connected with one end of a fuse F1, the other end of the fuse F1 is connected with the 2 nd pin of a common mode inductor L1, the 1 st pin and the 2 nd pin of the DF50A-10P-1V (51) connector are also connected with grounded capacitors C2, DF 56-10P-1V (51) pin and the 3 rd pin and the 4 th pin of the DF50A-10P-1V (51) connector are connected with a grounded capacitor C1, the 3 rd pin and the 4 th pin of the DF50A-10P-1V (51) connector are also connected with the 1 st pin of a common mode inductor L1, a resistor R1 is connected between the 2 nd pin and the 3 rd pin of the common mode inductor L1, a resistor R2 is connected between the 1 st pin and the 4 th pin of the common mode inductor L1, the 4 th pin of the common mode inductor L1 is also connected with an overheating fuse FB3 which is grounded, and the 3 rd pin of the common mode inductor L1 is also connected with a grounded capacitor CI2 which is grounded. The 5 th pin of the DF50A-10P-1V (51) connector is connected with a resistor R3, the other end of the resistor R3 is connected with a 3.3V input power supply, and the 5 th pin of the DF50A-10P-1V (51) connector is also connected with a resistor R4. The 6 th pin of the DF50A-10P-1V (51) connector is connected with a resistor R5, the other end of the resistor R5 is connected with a 3.3V input power supply, and the 5 th pin of the DF50A-10P-1V (51) connector is also connected with a resistor R6.
Through the circuit, the direct current input of DC24V-DC32V provided by an onboard power supply is connected to a positive high-voltage hot-plug surge current control unit with power limitation of LM5069 through a fuse, a common mode inductor and a voltage regulator tube, corresponding equipment carries out overvoltage, undervoltage and overcurrent protection respectively, and in order to improve the reliability of the BITE unit, a power supply system can independently supply power to the BITE unit.
As shown in fig. 2, the circuit of the DCDC power module includes an MPQ4430, a plurality of grounded capacitors (C8, C7, C6, C5, C3, and C4) are connected to a pin 2 of the MPQ4430, 28VDC is further connected to the pin 2 of the MPQ4430, a resistor R8 is further connected to the pin 2 of the MPQ4430, the other end of the resistor R8 is connected to a pin 5 of the MPQ4430, a resistor R7 is further connected to the other end of the resistor R8, the other end of the resistor R7 is connected to a 3.3V power supply, a diode DI3 is further connected to the other end of the resistor R8, the other end of the diode DI3 is connected to the other end of the resistor R4, a diode DI 5 is further connected to the other end of the resistor R8, the other end of the resistor R8 is further connected to a resistor R13, the other end of the resistor R13 is grounded, a capacitor C12 connected to the pin 12 of the MPQ4430 is connected to a grounded capacitor C10, the other end of the pin 12 of the MPQ4430 is connected to a pin 10, and a, The 9 th pin and the 13 th pin are both grounded, the 3 rd pin and the 11 th pin of the MPQ4430 are connected through a capacitor C9, a resistor R11 is connected to the 10 th pin of the MPQ4430, the other end of the resistor R11 is connected with a grounded capacitor C16, the 10 th pin of the MPQ4430 is further connected with an inductor L2 and an inductor L3, the other end of the inductor L3 is connected with a resistor R12, the other end of the resistor R12 is connected with a resistor R16, the other end of the resistor R16 is grounded, the other end of the inductor L3 is further connected with a capacitor C13, the other end of the capacitor C13 is connected with the 15 th pin of the MPQ4430, the other end of the inductor L3 is further connected with a resistor R17, the other end of the resistor R17 is connected with the 8 th pin of the MPQ4430, the 8 th pin 4430 is further connected with a grounded capacitor C17, the other end of the inductor L3 is further connected with a plurality of grounded capacitors (C10, C11, C1, mpcp 1 and the pin 4414 of the MPQ4430 is connected with a.
In the DCDC power module, the protected power is input into MPQ4430, wide voltage input, adjustable frequency and large current output can be met, the DCDC power module meeting vehicle-mounted specifications is met, the output voltage supplies power for the system, the output of the DCDC power module is controlled by a power switch and an MCU, and only when an external power switch and an NCU are simultaneously turned on, MPQ4430 can normally output power for the system.
As shown in fig. 2, the 1 st pin of LM5069 is connected with a resistor RI1, the other end of the resistor RI1 is connected with a grounded capacitor CI1, the other end of the resistor RI1 is further connected with the 2 nd pin of LM5069, the other end of the resistor RI1 is further connected with a diode DI1, the other end of the diode DI1 is connected with a resistor RI2, the other end of the resistor RI2 is connected with a diode DI2, the other end of the diode DI2 is grounded, the other end of the diode DI2 is further connected with the 5 th pin of LM5069, the other end of the resistor RI1 is further connected with a grounded diode D12, the other end of the resistor RI1 is further connected with a grounded capacitor CI2, the other end of the resistor RI1 is further connected with a resistor RI4, the other end of the resistor RI4 is connected with the 3 rd pin of LM5069, the other end of the resistor RI9 is further connected with a resistor 6, the other end of the resistor RI6 is connected with the 4 th. The 6 th pin of LM5069 is connected to capacitor CI4, the other end of capacitor CI4 is grounded, the 7 th pin of LM5069 is connected to resistor RI9, the other end of resistor RI9 is grounded, the 8 th pin of LM5069 is connected to resistor RI5, the other end of resistor RI5 is connected to the 9 th pin of LM5069, the other end of resistor RI5 is also connected to the 1 st pin, the 2 nd pin and the 3 rd pin of AMR492N/CSD18540Q5B, the 4 th pin of AMR492N/CSD18540Q5B is connected to the 10 th pin of LM5069, and the 9 th pin of AMR492N/CSD18540Q5B is connected to the 1 st pin of LM 5069.
As shown in fig. 3, the voltage detection circuit includes a VDD _2G _ CORE circuit, a VDD _ DDR circuit, a VDD _5G _ CORE circuit, and a VDD _ SYSTEM circuit, a VDD33_ VREF pin of the MCU is connected to the DCDC power module through the VDD _ SYSTEM circuit, a 5G _ VREF _11 pin of the MCU is connected to the CPU5G chip through the VDD _5G _ CORE circuit, a DDR _ VREF pin of the MCU is connected to the CPU2G chip through the VDD _ DDR circuit, and a 2G _ VREF _12 pin of the MCU is connected to the CPU2G chip through the VDD _2G _ CORE circuit. The resistor R18 of the VDD _2G _ CORE circuit is connected with the resistor R23, the resistor R23 is grounded, the resistor R29 of the VDD _ DDR circuit is connected with the resistor R33, the other end of the resistor R33 is grounded, the resistor R30 of the VDD _5G _ CORE circuit is connected with one end of the resistor R34, the other end of the resistor R34 is grounded, one end of the overheating fuse FB5 of the VDD _ SYSTEM circuit is connected with the resistor R20, the other end of the resistor R20 is connected with the resistor R22, the other end of the resistor R22 is grounded, the two ends of the resistor R20 are further connected with the capacitor C21, and the two ends of the resistor R22 are further connected with the capacitor C23. As shown in fig. 1, voltages VDD _2G _ CORE, VDD _ DDR, VDD _5G _ CORE, and VDD _ SYSTEM to be collected are placed in a short path as much as possible, and are connected to an ADC pin of an MCU through precise resistor voltage division, 2G _ VREF _12, DDR _ VREF, 5G _ VREF _11, and VDD33_ VREF, a digital quantity of a corresponding voltage is calculated by a correlation algorithm inside the MCU and stored in a corresponding structural variable, and meanwhile, it is also determined whether a corresponding voltage value exceeds 5%, if the voltage value exceeds the temperature value, a PWR _ ON _ MCU low level is output to a DCDC MPQ4430, and VDD _ SYSTEM is turned off to supply power to a WIFI SYSTEM, so as to reduce the safety of the whole SYSTEM due to overvoltage.
As shown in fig. 3, the Temperature detection circuit includes a Temperature Detected _1 circuit and a Temperature Detected _2 circuit, the NTC _ VREF pin of the MCU is connected to the CPU2G chip through the Temperature Detected _1 circuit, and the NTC1_ VREF pin of the MCU is connected to the CPU5G chip through the Temperature Detected _2 circuit. The resistor R37 of the Temperature Detected _1 circuit is connected with the resistor R39, the resistor R39 is grounded, the thermistor RT1 is connected in parallel with two ends of the resistor R39, and the capacitor C30 is connected with two ends of the resistor R37. The resistor R38 of the Temperature Detected _2 circuit is connected with the resistor R40, the resistor R40 is grounded, the thermistor RT2 is connected in parallel with two ends of the resistor R40, and the capacitor C29 is connected with two ends of the resistor R39. The temperature acquisition and processing adopts a low-cost NTC scheme meeting the requirement and two groups of mean value taking schemes, so that the accuracy of the temperature is improved, and the temperature acquisition and processing schemes are respectively placed in 2G modules and 5G modules; NTC _ VREF and NTC1_ MCU pin that are connected to MCU respectively, voltage (analog quantity) that MCU internal integration ADC will gather convert temperature value (digital quantity) according to the algorithm into and save to corresponding structure variable, also can judge simultaneously whether the temperature exceeds limit value 100 degrees centigrade, if exceed this temperature value, will output PWR _ ON _ MCU low level and give DCDC MPQ4430, close VDD _ SYSTEM and supply power for the WIFI SYSTEM, reduce the safety of entire SYSTEM because of overheated leading to.
As shown in fig. 3, the MCU employs PIC16F1824-I/SL, pin 1 of the MCU is connected to a grounded capacitor C26 and a grounded capacitor C25, pin 2 of the MCU is connected to a grounded resistor R31, pin 2 of the MCU is connected to a resistor R28, pin 3 of the MCU is connected to a resistor RP1, pin 4 of the MCU is connected to a resistor R32, pin 5 of the MCU is connected to a resistor RP4, pin 6 of the MCU is connected to a resistor RP6, pin 7 of the MCU is connected to a resistor RP8, pin 8 of the MCU is connected to a resistor RP10, pin 9 of the MCU is connected to a resistor RP9, pin 10 of the MCU is connected to a resistor RP7, pin 11 of the MCU is connected to a resistor RP5, pin 12 of the MCU is connected to a resistor RP3, pin 13 of the MCU is connected to a resistor RP2, and pin 14 of the MCU is grounded.
As shown in fig. 3, the 1 st pin of the TXS0102DCTR level conversion chip in the level conversion circuit is connected to the other end of the resistor RP9 through an I2C communication bus, the 2 nd pin of the TXS0102DCTR is grounded, the 3 rd pin of the TXS0102DCTR is connected to the grounded capacitor C28, the 3 rd pin of the TXS0102DCTR is connected to the resistor R36, the other end of the resistor R36 is connected to the 4 th pin of the TXS0102DCTR, the 3 rd pin of the TXS0102DCTR is connected to the resistor R35, the other end of the resistor R35 is connected to the 5 th pin of the TXS0102DCTR, the 6 th pin of the TXS0102DCTR is connected to the resistor R34, the 7 th pin of the TXS0102DCTR is connected to the grounded capacitor C31, and the 8 th pin of the TXS0102DCTR is connected to the resistor 7 through an I2C communication bus. Through an I2C communication bus, the detected single board data, temperature and voltage heartbeat message data of a fixed structure are reported to a central processing system through a gigabit RJ45, and the data are stored, wherein the central processing system is a wireless access control system of a cockpit.
The protected power supply is input to the wide voltage input and output adjustable of the LM317, the medium current is output, and the voltage supplies power to the BITE detection processing unit.
As shown in fig. 4, the WiFi communication circuit of the CPU2G chip and the CPU5G chip is similar, and for example, a 5G1 line is taken as an example, a grounded capacitor C32 is connected to the 1 st PIN of SKY13370, a grounded capacitor C33 is connected to the 3 rd PIN of SKY13370, a grounded capacitor C38 is connected to the 2 nd PIN of SKY13370, a capacitor C35 is connected to the 2 nd PIN of SKY13370, the 5 th PIN of SKY13370 and the 7 th PIN of SKY13370 are grounded, the 6 th PIN of SKY13370 is connected to resistor R44, the other end of resistor R44 is connected to capacitor C34, the other end of capacitor C34 is grounded, the 4 th PIN of SKY13370 is connected to capacitor C36, the other end of capacitor C36 is connected to inductor L4 which is grounded, the other end of capacitor C36 is connected to capacitor C37, the other end of capacitor C37 is connected to capacitor C39 which is grounded, and the other end of capacitor C39 is connected to MMCX _ PIN. Fig. 4 also shows a logic truth table, and the hardware switch ANT _ ONOFF and the signal passing through the not gate are connected to the rf switch simultaneously, and the logic truth table is matched to meet the requirement.
The CPU2G chip is connected with a PHY for connection to an external signal interface.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
Claims (9)
1. The utility model provides a civilian machine carries WIFI system with BITE function which characterized in that: comprises that
The wireless communication and switch unit is used for transmitting WiFi and controlling the opening and closing of the antenna;
the BITE unit is connected with the wireless communication and switch unit and used for voltage detection, temperature detection and level conversion; and
and the power supply unit is used for supplying power to the wireless communication and switch unit and the BITE unit.
2. The BITE-enabled civil airborne WIFI system of claim 1, wherein: the power supply unit includes DC power supply, has positive high voltage hot plug surge current control unit and DCDC power module of power restriction, DC power supply links to each other with DCDC power module through the positive high voltage hot plug surge current control unit that has power restriction, DCDC power module links to each other with BITE unit and wireless communication and switching unit, the positive high voltage hot plug surge current control unit that has power restriction still is connected with the stabiliser, the stabiliser links to each other with the BITE unit.
3. The BITE-enabled civil airborne WIFI system of claim 2, wherein: the BITE unit comprises an MCU, a voltage detection circuit, a temperature detection circuit and a level conversion circuit, the MCU is connected with the DCDC power module through the voltage detection circuit, and the MCU is connected with the switch unit through the voltage detection circuit, the temperature detection circuit and the level conversion circuit and wireless communication.
4. The BITE enabled civil airborne WIFI system of claim 3, wherein: the wireless communication and switch unit comprises a CPU2G chip, a CPU5G chip, an antenna control switch, a 2G antenna and a 5G antenna, wherein the CPU2G chip and the CPU5G chip are connected through a PCIE bus;
the CPU2G chip and the CPU5G chip are both connected with a DCDC power supply module, the CPU2G chip is connected with the MCU through a level conversion circuit, and the CPU2G chip and the CPU5G chip are both connected with the MCU through a voltage detection circuit and a temperature detection circuit;
the CPU2G chip is connected with the 2G antenna through an antenna control switch, and the CPU5G chip is connected with the 5G antenna through an antenna control switch.
5. The BITE enabled civil airborne WIFI system of claim 4, wherein: the voltage detection circuit comprises a VDD _2G _ CORE circuit, a VDD _ DDR circuit, a VDD _5G _ CORE circuit and a VDD _ SYSTEM circuit, a VDD33_ VREF pin of the MCU is connected with the DCDC power module through the VDD _ SYSTEM circuit, a 5G _ VREF _11 pin of the MCU is connected with a CPU5G chip through the VDD _5G _ CORE circuit, a DDR _ VREF pin of the MCU is connected with a CPU2G chip through the VDD _ DDR circuit, and a 2G _ VREF _12 pin of the MCU is connected with the CPU2G chip through the VDD _2G _ CORE circuit.
6. The BITE enabled civil airborne WIFI system of claim 4, wherein: the Temperature detection circuit comprises a Temperature Detected _1 circuit and a Temperature Detected _2 circuit, an NTC _ VREF pin of the MCU is connected with a CPU2G chip through the Temperature Detected _1 circuit, and an NTC1_ VREF pin of the MCU is connected with a CPU5G chip through the Temperature Detected _2 circuit.
7. The BITE enabled civil airborne WIFI system of claim 4, wherein: the antenna control SWITCH comprises TX/RX SWITCH and ANT SWITCH, the CPU2G chip or the CPU5G chip is connected with the TX/RXSWITCH through a filter, the TX/RX SWITCH is connected with ANT SWITCH, and the ANT SWITCH is connected with a 2G antenna or a 5G antenna.
8. The BITE-enabled WIFI system onboard a civilian vehicle as claimed in claim 7, wherein: the direct current power supply is also connected with a NOR circuit, and the NOR circuit is connected with ANT SWITCH.
9. The BITE enabled civil airborne WIFI system of any one of claims 4 to 8, wherein: the CPU2G chip is connected with a PHY, and the PHY is connected with a GE _ RJ45 connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911188146.2A CN111049549A (en) | 2019-11-28 | 2019-11-28 | Civil airborne WIFI system with BITE function |
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| CN114050714A (en) * | 2022-01-13 | 2022-02-15 | 苏州浪潮智能科技有限公司 | Method, circuit, device and medium for protecting PCIE (peripheral component interface express) card power supply |
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