A full-speed usb3.0 interface isolation protection device

Abstract

The invention provides a full-speed USB 3.0 interface isolation protecting device comprising a host portion and a slave portion. A high-speed signal isolating module, a low-speed differential data and power supply isolating module and an electromagnetic shielding module are arranged between the host portion and the slave portion; ESD electrostatic protection modules are connected to USB 3.0 interfaces, the ESD electrostatic protection modules are electrically connected to high-speed one-way differential signal modulations and demodulation modules and the low-speed differential data and power supply isolating module, the high-speed one-way differential signal modulation and demodulation modules of the host portion and slave portion are connected through the high-speed signal isolating module, and the ESD electrostatic protection modules of the host portion and slave portion are connected through the low-speed differential data and power supply isolating module. The full-speed USB 3.0 interface isolation protecting device has the advantages that actual general USB 3.0 interface power supply and signal isolation is realized, the transmitting efficiency of isolation signals is improved greatly, the USB 3.0 Super Speed level is achieved, anti-electrostatic protection is provided, electrostatic interference of one optional side can be prevented, and higher practical value in actual application is provided.

Description

Technical field [0001] The invention relates to the field of circuit isolation protection devices, in particular to a full-speed USB3.0 interface isolation protection device. Background technique [0002] As industrial electronic equipment has higher and higher requirements for data exchange speed, more and more industrial equipment has begun to use the USB interface, and the reliability requirements for communication have become higher and higher. However, the existing USB communication circuit has poor ability to resist interference from the operating environment, and is extremely susceptible to electrostatic and electromagnetic interference in the industrial environment. Moreover, due to the complexity of the industrial environment, the interface level of the host side and the device side may be different. Devices on both sides cannot work normally, and interference from either side will be transmitted to the host / device side along the USB interface, which can easily cause ser...

AI Technical Summary

Problems solved by technology

[0004] For example, Chinese patent 200510043916.6 provides a photoelectric isolation serial port signal isolation device. This device uses an optocoupler isolator to transmit signals. The transmission of low-speed serial port signals cannot achieve isolated transmission of high-speed signals, and cannot achieve power isolation

[0005] For example, Chinese patent 201320715627.6 provides a capacitive isolation signal isolation device with RS232 interface. Compared with photoelectric isolation, the capacitive isolation of this device simplifies the circuit design and reduces the cost, but the transmission speed is slow, and only RS232 low-speed signals can be used. For transmission, the communication efficiency is still very low, and it is still impossible to isolate and transmit high-speed signals

And compared with other methods, the isolation voltage is affected by the maximum withstand voltage of the capacitor, which will be relatively low

and still can't isolate the power

[0006] For example, Chinese patent 200720305047.4 provides a USB-TTL signal isolation device using transformer isolation. This device uses transformer isolation, which improves the transmission speed to a certain extent and can isolate the power supply. However, due to device design problems, it still cannot achieve USB The speed standard of the bus is still a serial port signal in essence

[0007] At present, several foreign semiconductor companies have provided solutions for the isolation of USB2.0 signals, but the price is high, the design of the scheme is complicated, and it is extremely difficult to promote it to practical applications.

Moreover, with the introduction of the USB3.0 standard, four high-speed unidirectional differential signal lines have been added to the USB2.0 standard, and higher requirements have been placed on the transmission rate of isolated signals, making the solutions of the above companies more suitable for USB3 .0 fails all

[0008] At present, the ESD electrostatic protection devices widely used at home and abroad contain large diode PN junction parasitic capacitance, which cannot meet the transmission requirements of high-speed signals. Even the ESD electrostatic protection devices designed for USB interfaces will inevitably damage the equipment. The transmission speed is affected, and the solution of this discrete device is no longer reliable due to its large size, additional PCB wiring parasitic capacitance, and difficult design and wiring.

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