Wired television signal junction box with safe separation function
A technology of cable TV and safety isolation, which is applied in the direction of TV, color TV, color TV parts, etc., can solve problems such as irregular installation, raised closed-circuit ground pressure difference, and zero-line potential drift, so as to avoid easy loss, Avoid the effect of not being easy to install
Active Publication Date: 2015-07-08
TPV ELECTRONICS (FUJIAN) CO LTD
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Problems solved by technology
[0002] Due to the non-standard installation of the household power system in mainland China, the neutral wire is connected to the ground wire without leakage protection, which often causes a current loop between the power ground and the closed circuit ground. Due to the poor installation and setting of the home improvement power supply system, the potential of the neutral line will drift greatly, thereby increasing the pressure difference between the closed circuit ground and the power supply ground, causing the closed circuit to heat up, and then spreading to the LCD TV, LCD TV, etc. The back shell of the CRT TV also melted, which caused burn-in problems and caused huge losses to users, families and society
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[0011] refer to figure 1 , a cable TV signal junction box with a safety isolation function, characterized in that: it includes a junction box 1, a closed-circuit signal input terminal 2 and a closed-circuit signal output terminal 3 are arranged in the junction box, and the closed-circuit signal input terminal 2 and A shielding circuit 4 for cutting off the current loop formed by the power ground and the closed-circuit ground is connected between the closed-circuit signal output terminals 3 .
[0012] The shielding circuit 4 includes an isolation capacitor 5 connected in series between the closed-circuit signal input terminal 2 and the closed-circuit signal output terminal 3 to isolate the internal DC signal of the closed-circuit line, and a ground wire 6 connected in series between the closed-circuit signal input terminal and the closed-circuit signal output terminal. Capacitor bank between ground wire 7.
[0013] The capacitor group includes a second capacitor 8 and a third ...
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The invention relates to a wired television signal junction box with a safe separation function, which is characterized by comprising a junction box internally provided with a closed-circuit signal input terminal and a closed-circuit signal output terminal; and a shielding circuit for cutting off a current loop formed by a power ground and a closed-circuit ground is connected between the closed-circuit signal input terminal and the closed-circuit signal output terminal. According to the invention, the shielding circuit is placed in the junction box, so that the wired television signal junction box with the safe separation function is convenient to install, is not easy to lose, and is low in cost. Meanwhile, the condition that when the load of a power grid changes, the potential of a zero line has larger shift, and the differential pressure between the closed-circuit ground and the power ground is raised, so that the burn-in phenomenon is caused can be avoided.
Description
technical field [0001] The invention relates to a cable TV signal junction box, in particular to a cable TV signal junction box with a safety isolation function. Background technique [0002] Due to the non-standard installation of the household power system in mainland China, the neutral wire is connected to the ground wire without leakage protection, which often causes a current loop between the power ground and the closed circuit ground. Due to the poor installation and setting of the home improvement power supply system, the potential of the neutral line will drift greatly, thereby increasing the pressure difference between the closed circuit ground and the power supply ground, causing the closed circuit to heat up, and then spreading to the LCD TV, LCD TV, etc. The back shell of the CRT TV also melted, which caused the burn-in problem and caused huge losses to the user's family and society. Contents of the invention [0003] Aiming at the above problems, the present ...
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IPC IPC(8): H04N5/00H04N7/10
Inventor 潘进于
Owner TPV ELECTRONICS (FUJIAN) CO LTD