Signal anti-crosstalk circuit for aviation head USB high-speed interface

Abstract

The utility model relates to a signal anti-crosstalk circuit for an aviation head USB high-speed interface, which comprises a USB core control module, a common mode inductor, a resistor module, an electrostatic protection module, a vertical type-c interface module and a USB aviation plug, and is characterized in that the USB core control module is used for being electrically connected with a CPU or an SOC of peripheral equipment to output a USB2.0 signal; the input end of the common mode inductor and the input end of the resistor module are electrically connected with the USB core control module to receive USB 2.0 signals, the output end of the common mode inductor and the output end of the resistor module are electrically connected with the input end of the electrostatic protection module, and the output end of the electrostatic protection module is electrically connected with the input end of the vertical type-c interface module. The output end of the vertical type-c interface module is electrically connected with the input end of the USB aviation plug, and the output end of the USB aviation plug and the output end of the vertical type-c interface module are both used for being electrically connected with computer equipment. According to the invention, the OTG function and the burning function of the USB line of the aviation head are not liable to interfere with each other.

Description

Technical Field

[0001] This application relates to the technical field of USB interfaces, and in particular to a signal anti-crosstalk circuit for a high-speed USB interface for aviation heads. Background Technology

[0002] An aviation-compatible USB cable typically refers to a USB cable with an aviation plug. One end of this type of USB cable has a standard USB connector (such as USB Type-A or USB Type-C), while the other end has an aviation plug specifically designed for aircraft or aviation equipment, featuring OTG and programming capabilities.

[0003] Reference Figure 1 However, in traditional aviation-grade USB circuits, the OTG function and the programming function of the USB aviation connector are completed on the same line, which can lead to mutual interference between the GYG function and the programming function, causing one of the functions to be unstable. For example, the USB speed may be reduced, the device may drop when a large storage device is connected, and the programming function may be unstable at times.

[0004] Reference Figure 2 To achieve both OTG and programming functions without crosstalk, it is usually necessary to set up two aviation-connected USB cables to perform the two different functions. However, this requires additional resources and is costly. Therefore, it is necessary to improve the aviation-connected USB cable. Summary of the Invention

[0005] In order to reduce costs and prevent interference between the OTG function and the programming function of the aviation-connected USB cable, this application provides a signal anti-crosstalk circuit for the aviation-connected USB high-speed interface.

[0006] The above-mentioned inventive objective of this application is achieved through the following technical solutions:

[0007] A signal crosstalk prevention circuit for an aviation-grade USB high-speed interface includes a USB core control module, a common-mode inductor and resistor module, an electrostatic discharge (ESD) protection module, a vertical Type-C interface module, and a USB aviation connector. The USB core control module is electrically connected to the CPU or SOC of a peripheral device to output USB 2.0 signals. The input terminals of the common-mode inductor and resistor module are electrically connected to the USB core control module to receive USB 2.0 signals. The output terminals of the common-mode inductor and resistor module are electrically connected to the input terminals of the ESD protection module. The output terminals of the ESD protection module are electrically connected to the input terminals of the vertical Type-C interface module. The output terminals of the vertical Type-C interface module are electrically connected to the input terminals of the USB aviation connector. The output terminals of both the USB aviation connector and the vertical Type-C interface module are used for electrical connection to computer equipment.

[0008] Optionally, the common-mode inductor and resistor module includes a common-mode inductor L1, a tolerance resistor R10, and a tolerance resistor R11. The output terminal of the common-mode inductor L1 includes a first pin and a second pin, and the input terminal of the common-mode inductor L1 includes a third pin and a fourth pin. The tolerance resistor R10 is connected in parallel with the first and fourth pins of the common-mode inductor L1, and the tolerance resistor R11 is connected in parallel with the second and third pins of the common-mode inductor L1. The first and fourth pins of the common-mode inductor L1 are negative data lines, and the second and third pins of the common-mode inductor L1 are positive data lines. The third and fourth pins of the common-mode inductor L1 are both electrically connected to the electrostatic discharge protection module, and the first and second pins of the common-mode inductor L1 are both electrically connected to the USB core control module.

[0009] Optionally, the electrostatic discharge protection module includes a first ESD transistor, a second ESD transistor, and the third pin of the common mode inductor L1 is electrically connected to one end of the first ESD transistor. The fourth pin of the common mode inductor L1 is electrically connected to one end of the second ESD transistor. The type-c interface module includes a connector P6, and both the first and second ESD transistor modules are electrically connected to the connector P6. The output end of the connector P6 is electrically connected to a USB aviation plug.

[0010] Optionally, the vertical Type-C interface module further includes an external OTG / programming connector J3. The first ESD tube is electrically connected to pin 18 of the connector J3, the second ESD tube is electrically connected to pin 16 of the connector J3, the output of the connector J3 is electrically connected to a USB aviation plug, and the output of the connector J3 is directly used for electrical connection to a computer device.

[0011] Optionally, it also includes a power step-down module and a power current limiting protection module. The power step-down module is electrically connected to the power current limiting protection module to provide a 5V voltage. The power current limiting protection module is electrically connected to the USB core control module, the vertical type-c interface module, and the USB aviation plug to provide a stable DC 5V voltage and a current-limited output of 2A.

[0012] Optionally, the power supply buck module includes a power management chip U20. The input terminal of the power management chip U20 is connected to a DC12V voltage. The boost output terminal of the power management chip U20 is electrically connected to a buck unit. The output terminal of the buck unit is electrically connected to a capacitor filter unit. The output terminal of the capacitor filter unit outputs a DC5V voltage.

[0013] Optionally, the capacitor filter unit includes four 22uF capacitors, namely capacitors C270, C273, C102, and C110, and a 100nF capacitor C274. The capacitors C270, C273, C102, and C110 are connected in parallel and then grounded. One end of the capacitor C270 is electrically connected to the output terminal of the step-down unit, and the capacitor C110 is electrically connected to the capacitor C274 and then grounded. The end of the capacitor C274 furthest from the ground outputs a DC 5V voltage.

[0014] Optionally, the power supply current limiting protection module includes a current limiting protection switch U42. The current limiting protection module is used to limit a current of 2A. The input terminal of the current limiting protection switch U42 is connected to a DC 5V voltage. The output terminal of the current limiting protection switch U42 is electrically connected to a Schottky diode D2. The input terminal of the Schottky diode D2 is electrically connected to the output terminal of the current limiting protection switch U42. The output terminal of the Schottky diode D2 outputs a DC 5V voltage and a current for freewheeling 2A.

[0015] In summary, this application includes at least one of the following beneficial technical effects:

[0016] 1. The common-mode inductor L1, model DLW21HN900SQ2, generates two canceling magnetic fields when differential-mode current flows through its coil; and two reinforcing magnetic fields when common-mode current flows through it, increasing the overall coil impedance and attenuating the common-mode current. This characteristic allows the common-mode inductor L1 to effectively suppress common-mode interference signals in balanced circuits without affecting the normally transmitted differential-mode signals. It enables both OTG and programming functions without crosstalk, and utilizes only one USB line, saving resources. Depending on the specific EMI situation and interference, either an OR resistor or the common-mode inductor L1 can be soldered, increasing circuit flexibility.

[0017] 2. When the circuit is working normally, the ESD transistor in the ESD protection module is in a high-resistance state, which does not affect the normal operation of the circuit. Once an abnormal overvoltage occurs in the circuit and reaches the breakdown voltage of the ESD transistor, the ESD transistor quickly changes from a high-resistance state to a low-resistance state, providing an impedance conduction path for the instantaneous current, clamping the abnormal voltage to a safe level, thereby protecting the protected IC or circuit.

[0018] 3. An onboard branch vertical Type-C interface module has been added to the traditional circuit. The purpose is to solve the problem of normal debugging, burning and OTG downloading when it is inconvenient to connect an external USB aviation plug during the board debugging stage, without causing signal loss, interference, speed reduction or USB device failure in the entire signal link or other signals.

[0019] 4. The 12V power input is stepped down and a stable 5V power output is provided. The power current limiting protection module uses an ETA6027SF current limiting chip to stabilize the power output and limit the current output to 2A, thus protecting the overall USB power supply circuit.

[0020] 5. The purpose of using the MBR0540 Schottky diode D2 is to protect circuits in communication power supplies, frequency converters, and high-speed computers from voltage spikes and reverse current.

[0021] 6. A combination of capacitors with different capacitances (22uF and 100nF) is used. Its main function is to reduce ripple and noise in the power supply voltage, improving the stability and reliability of the power supply. The basic principle of capacitor filtering is to utilize the charging and discharging characteristics of capacitors to smooth the power supply voltage. When the power supply voltage is higher than the voltage required by the load, the capacitor charges; when the power supply voltage is lower than the voltage required by the load, the capacitor discharges. Through the charging and discharging process of the capacitor, fluctuations in the power supply voltage are suppressed, thereby achieving the purpose of filtering. Attached Figure Description

[0022] Figure 1 This application presents a conventional USB signal circuit diagram in the background technology of a signal anti-crosstalk circuit for a high-speed USB interface for an aviation head.

[0023] Figure 2 This is another conventional USB signal circuit diagram in the background technology of a signal anti-crosstalk circuit for a high-speed USB interface for an aviation head;

[0024] Figure 3 This is a USB signal circuit diagram of an embodiment of a signal anti-crosstalk circuit for a high-speed USB interface for an aviation head according to this application;

[0025] Figure 4 This is a circuit diagram of the common-mode inductor and resistor module in an embodiment of a signal anti-crosstalk circuit for a high-speed USB interface for an aviation head, as described in this application.

[0026] Figure 5 This is a circuit diagram of the USB core control module in an embodiment of a signal anti-crosstalk circuit for a high-speed USB interface for an aviation head, as described in this application.

[0027] Figure 6 This is a circuit diagram of an electrostatic protection module in an embodiment of a signal anti-crosstalk circuit for a high-speed USB interface for an aviation head, as described in this application.

[0028] Figure 7 This is a circuit diagram of a vertical Type-C interface module in an embodiment of a signal anti-crosstalk circuit for a high-speed USB interface for an aviation head, as described in this application.

[0029] Figure 8 This is a circuit diagram of the power supply step-down module in an embodiment of a signal anti-crosstalk circuit for an aviation head USB high-speed interface of this application;

[0030] Figure 9 This is a circuit diagram of a power current limiting protection module in an embodiment of a signal anti-crosstalk circuit for an aviation head USB high-speed interface of this application. Detailed Implementation

[0031] To make the purpose, technical solution, and advantages of this application clearer, the following description is provided in conjunction with the appendix. Figure 3-9 The present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the application.

[0032] This application discloses a signal anti-crosstalk circuit for a high-speed USB interface on an aviation head. (Refer to...) Figure 3 A signal anti-crosstalk circuit for a high-speed USB interface for aviation connectors includes a USB core control module, a common-mode inductor, a resistor module, an electrostatic protection module, a vertical Type-C interface module, a USB aviation connector, a power supply step-down module, and a power supply current limiting protection module.

[0033] The USB core control module is electrically connected to the CPU or SOC of a peripheral device to output USB 2.0 signals. It is also electrically connected to the vertical Type-C interface module and the USB aviation connector to control the OTG / burning / downloading functions of the USB aviation connector and the external multiplexed output. The input of the common-mode inductor and resistor module is electrically connected to the USB core control module to receive USB 2.0 signals. The output of the common-mode inductor and resistor module is electrically connected to the input of the electrostatic discharge (ESD) protection module. The output of the ESD protection module is electrically connected to the input of the vertical Type-C interface module. The output of the vertical Type-C interface module is electrically connected to the input of the USB aviation connector. Both the USB aviation connector and the output of the vertical Type-C interface module are used for electrical connection to computer equipment. The power supply step-down module is electrically connected to the power supply current limiting protection module to provide 5V voltage. The power supply current limiting protection module is electrically connected to the USB core control module, the vertical Type-C interface module, and the USB aviation connector to provide a stable DC 5V voltage and a current-limited output of 2A.

[0034] Reference Figure 4 and Figure 5The common-mode inductor and resistor module includes a common-mode inductor L1, a tolerance resistor R10, a tolerance resistor R11, a resistor R17, and a resistor R18. The output terminals of the common-mode inductor L1 include a first pin and a second pin, while the input terminals include a third pin and a fourth pin. The tolerance resistor R10 is connected in parallel with the first and fourth pins of the common-mode inductor L1, and the tolerance resistor R11 is connected in parallel with the second and third pins of the common-mode inductor L1. The first and fourth pins of the common-mode inductor L1 are the negative data lines. The second and third pins of the common-mode inductor L1... The first pin is the positive data line. The third and fourth pins of the common-mode inductor L1 are electrically connected to the electrostatic protection module. The first pin of the common-mode inductor L1 is connected in series with the resistor R17 and then electrically connected to the USB core control module. The second pin of the common-mode inductor L1 is connected in series with the resistor R18 and then electrically connected to the USB core control module. The USB core control module is electrically connected to the control chip J10. The 18th pin of the control chip J10 is electrically connected to the first pin of the common-mode inductor L1, and the 20th pin of the control chip J10 is electrically connected to the second pin of the common-mode inductor L1.

[0035] Reference Figure 6 and Figure 7 The electrostatic discharge (ESD) protection module includes a first ESD transistor, a second ESD transistor, a third ESD transistor, and a fourth ESD transistor. The third pin of the common-mode inductor L1 is electrically connected to one end of the first ESD transistor, and the fourth pin of the common-mode inductor L1 is electrically connected to one end of the second ESD transistor. The Type-C interface module includes connector P6 and an external OTG / programming connector J3. Both the first and second ESD transistors are electrically connected to connector P6, and the output of connector P6 is electrically connected to a USB aviation plug. The first ESD transistor is also electrically connected to pin 18 of connector J3, the second ESD transistor is also electrically connected to pin 16 of connector J3, the third ESD transistor is electrically connected to pin 32 of connector J3, and the fourth ESD transistor is connected to pin 34 of connector J3. Pin 20 of connector J3 is electrically connected to pin 14 of control chip J10. This pin is the OTG_ID pin, used to identify the master and slave devices when the baseboard is low. This pin takes effect after entering the system and defaults to the OTG download port when powered on. The output terminals of connector J3 include pins 31, 33, 25 and 37 as I / O port output terminals. Pins 1 to 8 of connector J3 are signal transceiver ports, i.e. output terminals. The output terminals of connector J3 are electrically connected to the USB aviation plug, and the output terminals of connector J3 are directly used for electrical connection to computer equipment.

[0036] Reference Figure 8 and Figure 9The power supply step-down module includes a power management chip U20. Pin 4 of the power management chip U20 is the input terminal, connected to a DC 12V voltage. Pin 4 of the power management chip U20 is connected to ground in series with resistors R148 and R151. Two capacitors, C90 and C98, are connected in parallel at the end of resistor R148 furthest from pin 4 of the power management chip U20. The end of capacitor C90 furthest from ground is connected to a DC 12V voltage. Pin 2 of the power management chip U20 is electrically connected to the end of resistor R151 furthest from ground. Pin 2 of the power management chip U20 is connected to ground in series with capacitor C112. Pin 2 of the power management chip U20 is also electrically connected to pin 87 of the control chip J10. Pin 6 of the power management chip U20 is the sound pressure output terminal. The boost output terminal is electrically connected to a step-down unit, which includes an inductor L13, a capacitor C155, resistors R154 and R152.

[0037] The end of the buck unit furthest from the power management chip U20 is electrically connected to a capacitor filter unit. The output of the capacitor filter unit is a DC 5V voltage. The capacitor filter unit consists of four 22uF capacitors, namely capacitors C270, C273, C102, and C110, and a 100nF capacitor C274. The capacitors C270, C273, C102, and C110 are connected in parallel and then grounded. One end of capacitor C270 is electrically connected to the output of the buck unit, and capacitor C110 is electrically connected to capacitor C274 and then grounded. The end of capacitor C274 furthest from ground outputs a DC 5V voltage. A Zener diode D20 is also connected in parallel across capacitor C274.

[0038] The power supply current limiting protection module includes a current limiting protection switch U42 of model ETA6027SF. This current limiting protection switch limits a current of 2A. The input terminal of the current limiting protection switch U42 is pin 5. After filtering by capacitors C289 and C288, pin 5 of the current limiting protection switch U42 is connected to a DC 5V voltage. Pin 4 of the current limiting protection switch U42 is connected in series with a 1K resistor R322 and then electrically connected to pin 88 of the control chip J10. Pin 1 of the current limiting protection switch U42 is the input terminal. At the output end, the first pin of the current limiting protection switch U42 first outputs a DC 5V voltage. The first pin of the current limiting protection switch U42 is also electrically connected to a Schottky diode D2. The input terminal of the Schottky diode D2 is electrically connected to the output terminal of the current limiting protection switch U42. The output terminal of the Schottky diode D2 outputs a DC 5V voltage and is used for freewheeling current of 2A and preventing reverse power supply. Capacitors C13 and C14 are also connected in parallel between the first pin of the current limiting protection switch U42 and the Schottky diode D2 to serve as filters.

[0039] The implementation principle of a signal anti-crosstalk circuit for a high-speed USB interface in an aviation head according to an embodiment of this application is as follows: The USB core control module outputs a USB 2.0 signal to the common-mode inductor and resistor module. When the differential-mode current flows through the common-mode inductor L1 coil, two mutually canceling magnetic fields are generated; when the common-mode current flows through the common-mode inductor L1 coil, two mutually reinforcing magnetic fields are generated, which increases the impedance of the entire coil and attenuates the common-mode current. This allows the common-mode inductor L1 to effectively suppress common-mode interference signals in the balanced circuit without affecting the differential-mode signal transmitted normally by the line. This achieves both OTG and programming functions without generating crosstalk. As for the power supply of the USB line, the 12V power input is stepped down and current-limited by the protection switch U42 for voltage regulation and current limiting, resulting in a stable output of 5V voltage and 2A current. The purpose is to stabilize the power output and provide protection for the overall USB power supply circuit.

[0040] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Any feature disclosed in this specification (including the abstract and drawings) may be replaced by other equivalent or similar features unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is only one example of a series of equivalent or similar features.

Claims

1. A signal anti-crosstalk circuit for a high-speed USB interface in an aviation head, characterized in that: The device includes a USB core control module, a common-mode inductor and resistor module, an electrostatic discharge (ESD) protection module, a vertical Type-C interface module, and a USB aviation connector. The USB core control module is used to electrically connect to the CPU or SOC of a peripheral device to output USB 2.0 signals. The input terminals of the common-mode inductor and resistor module are electrically connected to the USB core control module to receive USB 2.0 signals. The output terminals of the common-mode inductor and resistor module are electrically connected to the input terminals of the ESD protection module. The output terminals of the ESD protection module are electrically connected to the input terminals of the vertical Type-C interface module. The output terminals of the vertical Type-C interface module are electrically connected to the input terminals of the USB aviation connector. The output terminals of both the USB aviation connector and the vertical Type-C interface module are used for electrical connection to computer equipment.

2. The signal anti-crosstalk circuit for a high-speed USB interface for an aviation head according to claim 1, characterized in that: The common-mode inductor and resistor module includes a common-mode inductor L1, a tolerance resistor R10, and a tolerance resistor R11. The output terminal of the common-mode inductor L1 includes a first pin and a second pin, and the input terminal of the common-mode inductor L1 includes a third pin and a fourth pin. The tolerance resistor R10 is connected in parallel with the first and fourth pins of the common-mode inductor L1, and the tolerance resistor R11 is connected in parallel with the second and third pins of the common-mode inductor L1. The first and fourth pins of the common-mode inductor L1 are negative data lines, and the second and third pins of the common-mode inductor L1 are positive data lines. The third and fourth pins of the common-mode inductor L1 are both electrically connected to the electrostatic discharge protection module, and the first and second pins of the common-mode inductor L1 are both electrically connected to the USB core control module.

3. The signal anti-crosstalk circuit for a high-speed USB interface for an aviation head according to claim 2, characterized in that: The electrostatic discharge protection module includes a first ESD transistor, a second ESD transistor, and the third pin of the common mode inductor L1 is electrically connected to one end of the first ESD transistor. The fourth pin of the common mode inductor L1 is electrically connected to one end of the second ESD transistor. The Type-C interface module includes a connector P6, and both the first and second ESD transistor modules are electrically connected to the connector P6. The output end of the connector P6 is electrically connected to a USB aviation plug.

4. The signal anti-crosstalk circuit for a high-speed USB interface for an aviation head according to claim 3, characterized in that: The vertical Type-C interface module also includes an external OTG / programming connector J3. The first ESD tube is electrically connected to pin 18 of the connector J3, the second ESD tube is electrically connected to pin 16 of the connector J3, the output of the connector J3 is electrically connected to a USB aviation plug, and the output of the connector J3 is directly used for electrical connection to a computer device.

5. A signal anti-crosstalk circuit for a high-speed USB interface for an aviation head according to claim 1, characterized in that: It also includes a power step-down module and a power current limiting protection module. The power step-down module is electrically connected to the power current limiting protection module to provide a 5V voltage. The power current limiting protection module is electrically connected to the USB core control module, the vertical type-c interface module, and the USB aviation plug to provide a stable DC 5V voltage and a current-limited output of 2A.

6. The signal anti-crosstalk circuit for a high-speed USB interface for an aviation head according to claim 5, characterized in that: The power supply step-down module includes a power management chip U20. The input terminal of the power management chip U20 is connected to a DC12V voltage. The boost output terminal of the power management chip U20 is electrically connected to a step-down unit. The output terminal of the step-down unit is electrically connected to a capacitor filter unit. The output terminal of the capacitor filter unit outputs a DC5V voltage.

7. A signal anti-crosstalk circuit for a high-speed USB interface for an aviation head according to claim 6, characterized in that: The capacitor filter unit includes four 22uF capacitors, namely capacitors C270, C273, C102, and C110, and a 100nF capacitor C274. The capacitors C270, C273, C102, and C110 are connected in parallel and then grounded. One end of the capacitor C270 is electrically connected to the output terminal of the step-down unit. The capacitor C110 is electrically connected to the capacitor C274 and then grounded. The end of the capacitor C274 furthest from the ground outputs a DC 5V voltage.

8. A signal anti-crosstalk circuit for a high-speed USB interface for an aviation head according to claim 5, characterized in that: The power supply current limiting protection module includes a current limiting protection switch U42. The current limiting protection module is used to limit the current to 2A. The input terminal of the current limiting protection switch U42 is connected to a DC 5V voltage. The output terminal of the current limiting protection switch U42 is electrically connected to a Schottky diode D2. The input terminal of the Schottky diode D2 is electrically connected to the output terminal of the current limiting protection switch U42. The output terminal of the Schottky diode D2 outputs a DC 5V voltage and a freewheeling current of 2A.

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