Method for preventing interface burning-out of equipment with external equipment interface

Abstract

The invention provides a method for preventing interface burning-out of equipment with an external equipment interface. In all layers of a printed circuit board (PCB) main board of the equipment, a signal line is not arranged at the external equipment interface, a copper plane of a non-machine shell ground is not paved at the external equipment interface, the place at the external equipment interface of each layer of the PCB main board serves as a machine shell ground area independently, a copper plane of a machine shell ground is only paved on the area, the copper plane is communicated to a machine shell in at least one position, an exceptionally high-energy release path is communicated to the machine shell at the position, and the machine shell ground of the external equipment interface in each layer of the PCB main board is separated from the non-machine shell ground. When exceptionally high energy is filled into the main board of any external equipment, the energy can be quickly released to an outer shell of the equipment, so that the exceptionally high energy does not flee to a back main board circuit to affect the normal work of the back main board circuit, or damage a device and even burn the main board, and the back main board circuit and the device are effectively protected.

Description

【Technical field】 [0001] The invention relates to a device with an audio and video interface, and particularly relates to a method for preventing the device with a peripheral interface from burning. 【Background technique】 [0002] Devices with peripheral interfaces, especially devices with audio and video interfaces, such as set-top boxes, are often connected to various audio and video peripherals (including various brands of TVs, power amplifiers, or sound effects) in actual use. Collaborate to provide customers with a good entertainment experience. [0003] However, because there are many brands of peripherals, the quality is uneven, and the power supply is not uniform (some use 2-core and some use 3-core power supply). Taking a set-top box as an example, it needs to be connected to these different peripherals through audio and video interfaces, resulting in a large potential difference or ground loop between the shell ground of the set-top box and the shell ground of the...

AI Technical Summary

Problems solved by technology

[0006] Disadvantage 1: Although the audio ground is separated from the system ground, due to unreasonable handling, when large energy enters the motherboard from the audio interface, the energy cannot be released in time, resulting in burns;

[0007] Disadvantage 2: The chassis ground of all interfaces and the system digital ground share the same ground plane. When abnormal energy enters from the video interface, the abnormal energy will scurry to the motherboard circuit, thereby damaging or burning the motherboard, which cannot effectively solve the problem of burning. Mouth problem;

[0008] Disadvantage 3: In addition to the audio ground, the digital ground and the chassis ground are together. If there is interference in the chassis, the ground of the motherboard is prone to fluctuations, resulting in system instability

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