Signal Isolator Device

Abstract

The embodiment of the present invention relates to a signal isolator device. The device includes: an inner core, used to connect the signal line of the set-top box and the signal line of the TV cable; a feedthrough capacitor, which is ring-shaped and sleeved outside the insulating medium coated on the outer surface of the inner core, including the first contact surface , the second contact surface and the capacitance placed between the first contact surface and the second contact surface; the shell, including: the male end shell, used for the connection between the first contact surface and the ground wire of the set-top box; the female end shell, Used for the connection between the second contact surface and the ground wire of the TV cable; so that the DC signal between the ground wire of the set-top box and the ground wire of the TV cable is isolated by the feedthrough capacitor, and the ground wire of the set-top box and the ground wire of the TV cable The first AC signal between them is conducted through the feedthrough capacitor. The signal isolation device of the invention effectively shields the signal interference caused by the potential difference between the ground wire of the power grid and the ground wire of the cable TV network, and improves the viewing effect of the user.

Description

Technical field [0001] The present invention relates to the field of communication technology, 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 watching cable TV. However, if the ground between the set-top box and the TV is not balanced, various malfunctions may be caused. Especially flat-panel TVs often use three-terminal power plugs: the live wire, neutral wire, and ground wire are connected to the display screen. And many set-top boxes of recipes are power plugs with two terminals and no ground wire. For TV signals transmitted through coaxial cables, if the grounding resistance does not meet the specification requirements during the network reconstruction and construction, the voltage of the cable sheath to ground is not zero, or the grounding of the power supply system at the user ...

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.

Images