Signal isolator

Abstract

The invention embodiment relates to a signal isolator comprising the following structures: an inner core used for connecting a signal line of a STB with a signal line of a TV cable; a feedthru capacitor sleeved in an annular manner outside an insulation medium wrapping an outer surface of the inner core, and comprises a first contact surface, a second contact surface and a capacitor arranged between the first and second contact surfaces; a housing comprising a male end housing used for connecting the first contact surface with a ground wire of the STB and a female housing used for connecting the second contact surface with a ground wire of the TV cable, so DC electric signals between the ground wires of the STB and the TV cable can be isolated by the feedthru capacitor, and a first AC signal between the ground wires of the STB and the TV cable is conducted through the feedthru capacitor. The signal isolator can effectively shield signal interferences caused by potential differences between power grid ground wire and the cable TV network ground wire, thus improving user watching effect.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a signal isolator device. Background technique [0002] With the development and popularization of digital cable TV technology, flat panel TVs and set-top boxes have become the most commonly used household appliances for people to watch cable TV. However, an unbalanced ground between the set-top box and the TV can cause various problems. In particular, flat-panel TVs often use three-terminal power plugs: the live wire, neutral wire, and ground wire of the power supply are respectively connected to the display screen. However, the set-top boxes of many formulas are power plugs with two terminals, and there is no ground wire. For the TV signal transmitted through the coaxial cable, if the grounding resistance does not meet the specification requirements during the network transformation construction process, the voltage of the cable sheath to the ground is not zero, or the ...

AI Technical Summary

Problems solved by technology

And the set-top boxes of many recipes are power plugs with two terminals, no ground wire

For the TV signal transmitted through the coaxial cable, if the grounding resistance does not meet the specification requirements during the network transformation construction process, the voltage of the cable sheath to the ground is not zero, or the user’s power supply system is not well grounded, or even the actual floating ground, etc. , will cause a ground potential difference between the set-top box connected to the coaxial cable and the TV

This situation will cause AC interference after the LCD TV is connected to the set-top box, specifically manifested as AC hum in the audio, and two obvious rolling bars on the image. If the interference is serious, the image cannot be displayed

It may even cause sparks when the signal line and the interface are connected, causing damage to the TV, and more seriously, there will be a hidden danger of spontaneous combustion in the flat-panel TV.

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