HDMI (high-definition multimedia interface) power supply protective circuit and audio and video equipment

Abstract

The invention relates to a HDMI (high-definition multimedia interface) power supply protective circuit and audio and video equipment. The HDMI power supply protective circuit comprises a circuit control unit, a circuit start-up unit and a circuit detecting unit, wherein the circuit start-up unit is used for controlling a gate electrode of an MOS (metal oxide semiconductor) tube to be in low electric level when the circuit is electrified, so that the MOS tube is conducted to supply lower; the circuit detecting unit is used for detecting the output end of the power supply; the circuit start-up unit is used for controlling the gate electrode of the MOS tube to be in high electric level when short circuit happens, so that the MOS tube is cut off to protect. The circuit detecting unit is used for detecting the voltage of the output end of the power supply; when the short circuit happens, the detection is performed and the circuit start-up unit is used for controlling the circuit control unit to cut off, so that effective protection is realized when the power supply of the HDMI supply has short circuit, and therefore, the risk that the audio and video equipment is damaged is effective avoided, and the safety of the equipment is improved.

Description

technical field [0001] The invention relates to the field of digital television, in particular to an HDMI interface power protection circuit and audio and video equipment. Background technique [0002] With the popularization of high-definition digital TV, the HDMI interface with high-definition output capability has gradually become a necessary interface for high-definition digital audio and video equipment (such as TV sets, set-top boxes, etc.), so the reliability requirements of HDMI interface design are getting higher and higher. [0003] When using the HDMI interface, the 5V power supply circuit of the HDMI interface is more prone to short-circuit faults, which greatly increases the risk of damaging audio and video equipment (set-top boxes, even TVs). There are generally two detection mechanisms for short-circuit protection: current detection and voltage detection. Usually, the design method for HDMI interface 5V power supply protection is to use current detection to ad...

AI Technical Summary

Problems solved by technology

[0004] In view of this, it is necessary to provide a HDMI interface power supply protection circuit and audio and video equipment for the above-mentioned problem that the HDMI interface power supply is prone to short-circuit faults and damage audio and video equipment.

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