CN2517202Y

CN2517202Y - Suply unit of all-channel TV receiving antenna amplifier

Info

Publication number: CN2517202Y
Application number: CN02202532U
Authority: CN
Inventors: 刘凤海
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-01-25
Filing date: 2002-01-25
Publication date: 2002-10-16
Anticipated expiration: 2012-01-25

Abstract

The utility model relates to a power supply unit for a receiving antenna amplifier of a full-channel television, comprising a transformer, an overcurrent protection circuit, a coupled circuit and a video signal distributor. The transformer and the overcurrent protection circuit are arranged in a housing and form an inline structure; the coupled circuit and the video signal distributor are arranged in another housing and are inserted into the interface of the television antenna, reducing the feeder loss. The utility model has the advantages of simple structure, low cost, the function of short circuit and the overcurrent protection and little feeder loss.

Description

Full channel tv receiving antenna amplifier power supply device

Technical field

The utility model relates to a kind of full channel tv receiving antenna amplifier power supply device.

Background technology

(number of patent application: 01233455.3), it is made up of transformer, coupling circuit, DC power supply circuit, TV turning on-off monitoring circuit, overvoltage crowbar, driving executive circuit, relay normally open contact, TV set power socket by " the full channel tv receiving antenna amplifier circuit device " of the applicant application; The TV turning on-off monitoring circuit is made up of sample circuit, comparator and voltage follower, and overvoltage crowbar is made up of voltage sampling circuit, comparator and voltage follower.Above-mentioned patent application has over-voltage protecting function, and can cut off the power supply of antenna amplifier antennafire according to television set switch situation.Its shortcoming is a complex structure, and cost is higher.

Summary of the invention

Technical problem to be solved in the utility model provides a kind of full channel tv receiving antenna amplifier power supply device simple in structure, lower-cost.

The technical scheme that its technical problem that solves the utility model adopts is: it is made up of transformer and current foldback circuit, coupling circuit and video distributor, and transformer and current foldback circuit are by transformer T ₁, resistance R ₁, R ₂, LED ₁, LED ₂Form T ₁Elementary connecing～220V, R ₁With LED ₁Be composed in series behind the display circuit again and T ₁Secondary parallel connection, R ₂With LED ₂Compose in parallel after the protective circuit again and T ₁Secondary series connection, the output of transformer and current foldback circuit is AB, coupling circuit and video distributor are by resistance R ₄, R ₅, capacitor C ₁, C ₂, choke L, video plug CH ₁-CH ₃Form the trap capacitor C ₁Be connected in parallel on the output terminals A B of transformer and current foldback circuit, the termination output terminals A of choke L, its other end is connected to the CH of antenna amplifier antennafire ₁, be connected to the CH of television set ₂, CH ₃Respectively through R ₄, R ₅Meet coupling capacitance C ₂Same end, C ₂Another termination L and CH ₁The node place.

The beneficial effects of the utility model be simple in structure, cost is lower, and has short circuit and overcurrent protection function, in addition and since its adopt video distributor directly with the grafting of TV set aerial interface, reduced feeder loss.

Description of drawings

Fig. 1 is circuit theory diagrams of the present utility model.

Embodiment

By embodiment shown in Figure 1 as can be known, it is made up of transformer and current foldback circuit, coupling circuit and video distributor, and transformer and current foldback circuit are by transformer T ₁, resistance R ₁, R ₂, LED ₁, LED ₂Form T ₁Elementary connecing～220V, R ₁With LED ₁Be composed in series behind the display circuit again and T ₁Secondary parallel connection, R ₂With LED ₂Compose in parallel after the protective circuit again and T ₁Secondary series connection, the output of transformer and current foldback circuit is AB, coupling circuit and video distributor are by resistance R ₄, R ₅, capacitor C ₁, C ₂, choke L, video plug CH ₁-CH ₃Form the trap capacitor C ₁Be connected in parallel on the output terminals A B of transformer and current foldback circuit, the termination output terminals A of choke L, its other end is connected to the CH of antenna amplifier antennafire ₁, be connected to the CH of television set ₂, CH ₃Respectively through R ₄, R ₅Meet coupling capacitance C ₂Same end, C ₂Another termination L and CH ₁The node place.

Coupling circuit and video distributor also include by resistance R ₃With LED ₃The display circuit of forming, R ₁With LED ₃Series connection back and C ₁In parallel.

Transformer and current foldback circuit are contained in and constitute direct insertion structure in the housing, and coupling circuit and video distributor are contained in another housing, and direct and TV set aerial interface is pegged graft.

Operation principle of the present utility model is as follows:

Alternating current 220V is through T ₁Transformation is for exchanging 12V, LED ₁Be power supply indicator, LED ₂Be the short circuit indicator light, when load is short-circuited, through R ₂Electric current increase R ₂The pressure drop of last generation makes LED ₂Bright.C ₁Effect be to filter high-frequency signal.LED ₃Be power supply indicator ,～12V power supply is through choke L and CH ₁To the antenna amplifier antennafire power supply, TV signal is through C ₂Be coupled to CH ₂, CH ₂, CH ₂, CH ₃Be connected to two television sets respectively, R ₄, R ₅Effect be to prevent phase mutual interference between two TVs.

The user when fixing up an aerial wire, if when plug or feeder line are short-circuited LED ₂Bright, the user just as can be known setup error fix a breakdown.

Claims

1, a kind of full channel tv receiving antenna amplifier power supply device is characterized in that it is made up of transformer and current foldback circuit, coupling circuit and video distributor, and transformer and current foldback circuit are by transformer T ₁, resistance R ₁, R ₂, LED ₁, LED ₂Form T ₁Elementary connecing～220V, R ₁With LED ₁Be composed in series behind the display circuit again and T ₁Secondary parallel connection, R ₂With LED ₂Compose in parallel after the protective circuit again and T ₁Secondary series connection, the output of transformer and current foldback circuit is AB, coupling circuit and video distributor are by resistance R ₄, R ₅, capacitor C ₁, C ₂, choke L, video plug CH ₁-CH ₃Form the trap capacitor C ₁Be connected in parallel on the output terminals A B of transformer and current foldback circuit, the termination output terminals A of choke L, its other end is connected to the CH of antenna amplifier antennafire ₁, be connected to the CH of television set ₂, CH ₃Respectively through R ₄, R ₅Meet coupling capacitance C ₂Same end, C ₂Another termination L and CH ₁The node place.

2, full channel tv receiving antenna amplifier power supply device according to claim 1 is characterized in that coupling circuit and video distributor also include by resistance R ₃With LED ₃The display circuit of forming, R ₁With LED ₃Series connection back and C ₁In parallel.

3, full channel tv receiving antenna amplifier power supply device according to claim 2; it is characterized in that transformer and current foldback circuit are contained in the direct insertion structure of formation in the housing; and coupling circuit and video distributor are contained in another housing, and direct and TV set aerial interface is pegged graft.