Device interface protection circuit

A device interface and protection circuit technology, applied in emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve damage to the USB host and USB peripherals, damage to the USB host or USB peripherals and other problems, to achieve high protection level, good reliability, and solve the effects of surge and electrostatic protection problems

Pending Publication Date: 2020-01-14
EMERSON NETWORK POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the USB specification, the USB interface cable can be as long as 5 meters. If there is a common-mode voltage (typically a surge voltage) between the host USB interface and the peripheral USB interface, it will be conducted through the USB cable, thereby damaging the USB host or USB peripherals
In addition, when the USB interface is coupled with electrostatic discharge (ESD, Electro-Static discharge) energy, it will also damage the USB host and USB peripherals.

Method used

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0024] The invention relates to a device interface protection circuit, comprising a first inductance module connected between the VBUS port of the device interface and the positive pole of the power supply, a second inductance module connected between the GND port of the device interface and the power supply ground, and connected To the gas discharge module between the VBUS port, the GND port and the protection ground, connected to the signal line port of the device interface, between the positive pole of the power supply and the power ground to start the gas discharge module A gas discharge starti...

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Abstract

The invention provides a device interface protection circuit. The circuit comprises a first inductance module connected between the VBUS port of a device interface and the positive pole of a power supply, a second inductance module connected between the GND port of the device interface and the power supply ground, a gas discharge module connected between the VBUS port, the GND port and the protective ground, a gas discharge initiating module connected between the signal line port of the device interface, the positive pole of the power supply and the power supply ground to initiate the gas discharge module, and a bleed module arranged between the protective ground and the power supply ground. According to the device interface protection circuit provided by the invention, by constructing a common mode protection path and a differential mode protection path, the common mode and differential mode protection of the device interface can be smoothly realized; the problems of surge and electrostatic protection are solved; and the circuit has the advantages of high protection level, low clamp voltage and good reliability.

Description

technical field [0001] The present invention relates to equipment, more specifically, to a device interface protection circuit. Background technique [0002] Currently, device interfaces, such as USB interfaces, have been widely used in consumer electronics products, communication equipment and industrial equipment. Through the USB interface, data transmission is realized between the host computer and the external device. According to the USB specification, the USB interface cable can be as long as 5 meters. If there is a common-mode voltage (typically a surge voltage) between the host USB interface and the peripheral USB interface, it will be conducted through the USB cable, thereby damaging the USB host or USB peripherals. In addition, when the USB interface is coupled with electrostatic discharge (ESD, Electro-Static discharge) energy, it will also damage the USB host and USB peripherals. [0003] Therefore, there is a need for a device interface protection circuit cap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04H02H9/06
CPCH02H9/04H02H9/06
Inventor 程刚胡开埂彭鸿蒋茜若
Owner EMERSON NETWORK POWER CO LTD
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