Set-top box and set-top box safety protection method

Abstract

The invention discloses a set-top box and a set-top box safety protection method. The problem of heat accumulation caused by current flowing on a cable television network and power network ground wire is avoided. The set-top box comprises a main processing circuit, a cable television signal receiving terminal, a gating circuit, a through circuit and an isolation circuit. When the set-top box detects a startup signal and judges that current on the cable television signal ground wire exceeds a threshold value, the gating circuit is controlled to be communicated with the output of a second output end, and the isolation circuit isolates the current of the ground wire. If the current does not exceed the threshold value, the gating circuit is controlled to be communicated with the output of a first output end, so that the through circuit is communicated with the cable television signal ground wire. After a shutdown signal is detected, the gating circuit is controlled to be connected with a third output end, and the channel of the cable television signal ground wire is cut off. In the aspects of startup and shutdown, after the current of the ground wire between networks is large due to poor or unauthorized wire building, the channel of the ground wire current is cut off, and safety risks caused by long time current accumulation are eliminated.

Description

technical field [0001] The invention relates to the technical field of set-top boxes, in particular to a set-top box and a security protection method for the set-top box. Background technique [0002] Receiving cable TV programs through a set-top box is a common way to watch cable TV at present. The set-top box receives the cable TV signal and converts the digital cable TV signal into an analog TV signal. play. [0003] Such as figure 1 As shown, the cable TV signal is connected to the set-top box 2 through the household TV signal home connector 1, and then the ground SE of the cable TV network and the ground wire of the set-top box circuit are also connected together; the set-top box 2 is connected to the TV 4 through the audio and video connection line 3 , so that the ground wire of the set-top box 2 and the ground wire of the TV 4 are connected together; and the ground wire of the TV 4 is connected together with the protection ground PE of the power network through the ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a set-top box and a set-top box safety protection method to solve the technical problem of long-term flow of current and accumulated heat caused by the indirect connection of the network due to the existence of a path between the cable TV network and the power network, or when the line is built without permission.

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