CN2085124U

CN2085124U - Automatic cut-off device for tv set

Info

Publication number: CN2085124U
Application number: CN 90218193
Authority: CN
Inventors: 黄波
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-08-16
Filing date: 1990-08-16
Publication date: 1991-09-18

Abstract

The utility model relates to an automatic cut-off power cut device for a television set. A signal of the device is from a synchronous separation pole of a television set. When a composite television signal is supplied, the signal is a synchronizing signal; when no television signal is supplied, the signal is a noise dot signal. The device is provided with a signal discrimination circuit which can output a voltage when the synchronizing signal arrives. When the noise signal arrives, no voltage is outputted. After the television set is provided with the device, a power switch is turned on, and people can watch TV. If television programs are supplied, the power switch can be turned off, and the television set still works. After the programs are finished, the television set is automatically disconnected with electricity in a time delay mode.

Description

Automatic cut-off device for TV set

The utility model relates to a kind of on television set, the automatic shutdown breaker device of particularly installing on the black and white television set.

Present stage, it is also few that China has the user of high-grade colour TV, and it is the most universal with samll cities and towns and rural area to have the user of black and white television set, but its television set does not possess the function of automatic shutdown as high-grade colour TV.After TV programme finishes, go shutdown artificially, or convenient shutdown etc. on sleeping unintentionally when seeing TV, winter recumbency bed, cause TV to damage easily and bring some inconvenience to life.

Existing high-grade colour TV generally all is remote-control closedown and timing shutdown, and timing is difficult to grasp, and additional supply is still switched in the shutdown back.

The purpose of this utility model provides a kind of after TV programme finishes, the device of all power supplys in the energy automatic cutting off table.

The purpose of this utility model is achieved in that because synchronizing signal is the sign that picture intelligence arrives, so the control signal of this device is taken from the separated in synchronization level of television set.When composite video signal is arranged, separate level and isolate composite synchronizing signal, based on line synchronizing signal, its frequency is 15625 hertz.During no TV signal, separate level and isolate the noise spot signal.So the signal from the separated in synchronization level will differentiate that the resonance frequency of circuit is transferred on 15625 hertz through the signal identification circuit in this device.When synchronizing signal arrives, circuit resonance, output one control voltage, when the noise spot signal arrives, the circuit failure of oscillation will not have voltage output or atomic.The voltage that signal identification circuit is exported, after the amplifying circuit processing through this device, make the relay of the small capacity double group contact in this device be in attracting state, because two normally opened contacts of this relay and the mains switch of television set are in parallel, this moment is if disconnect TV set power switch, television set is still worked, and is in the standby condition of shutdown.After TV programme finished, synchronizing signal disappeared, and control voltage disappears thereupon, delayed time 10-20 after second through the delay circuit of this device, and relay discharges, and its normally opened contact disconnects, and finishes the power process of automatic shutdown.

The utility model need not done any change because only need to obtain synchronizing signal from television set separated in synchronization level to the television set primary circuit.Therefore circuit structure is succinct, and selection is easy, only needs simple debugging just can reach above-mentioned requirements.

The particular circuit configurations of utility model is provided by accompanying drawing.Fig. 1 is circuit theory diagrams, and Fig. 2 is two normally opened contact JK of this device relay ₁, JK ₂Connection layout with TV set power switch.

The selection of operation principle and part is described below in conjunction with Fig. 1.

Operation principle: this device is by 12V power supply power supply in the machine.The A point connects separated in synchronization level collector electrode among the figure, when synchronizing signal arrives, through R ₁, C ₁Make L and C ₂Parallel resonance produces voltage at coil B end, through D ₁, C ₃Make BG behind the rectifying and wave-filtering ₁Conducting, R ₂Make it be in degree of depth saturation condition, BG ₂End BG because of can not get bias voltage ₃Conducting is saturated, the relay J adhesive.TV programme finishes, when noise signal arrives, and L and C ₂Can not resonance, B holds no-voltage, BG ₁End R ₂To C ₄Charging (time-delay process) is charged to D when voltage ₂Conducting voltage the time, BG ₂Saturated, BG ₃Lose bias voltage and end relay J release.

Element is selected: R ₁Do not exceed the 2-3K scope.R ₂、56K，R ₃、4.7K，R ₄、R ₅、1K，C ₁、1uf／16V，C ₂、0.068uf，C ₅、1uf／16V，C ₄、220uf／16V。L is a row oscillation coil.D ₁Select 2AK series, D ₂Be 2CW56, D ₅Be 2CP12.BG ₁, BG ₂Select 3DG6,3DG201 etc., BG ₁Multiplication factor 〉=60; BG ₂Multiplication factor 〉=80, BG ₃Select 3DG12, triodes such as 9013, multiplication factor 〉=60 get final product.J selects the small capacity double group contact relay of DC12V for use, as: JRX--13F.S is a selector switch, places on the TV set panel.Be that automatically shutdown is connected during the S on the left side, S be shutdown releasing automatically on the right the time.Whether LED places and is used to refer to J on the TV set panel and works.

Debugging: disconnect BG ₁Base stage is surveyed C when synchronizing signal is arranged ₅Both end voltage is regulated the L magnetic core and is made the voltage maximum, suitably selects R ₁Voltage is got final product greater than 0.7 volt.

Claims

1, a kind of television auto-shutdown breaker device is characterized in that: this device has a signal identification circuit that is composed in parallel by the LC element.

2, according to the described device of claim 1, it is characterized in that: the discriminator circuit desired signal is from the separated in synchronization level of television set.