CN201345696Y

CN201345696Y - System for reducing power consumption of digital television set-top box

Info

Publication number: CN201345696Y
Application number: CNU2008201609303U
Authority: CN
Inventors: 丁锦俊; 皮莉
Original assignee: Nanjing Panda Electronics Co Ltd; Panda Electronics Group Co Ltd
Current assignee: Nanjing Panda Electronics Co Ltd; Panda Electronics Group Co Ltd
Priority date: 2008-11-21
Filing date: 2008-11-21
Publication date: 2009-11-11
Anticipated expiration: 2018-11-21

Abstract

A system for reducing the power consumption of a digital television set-top box is characterized in that the system comprises a monitoring circuit. A signal input terminal of the monitoring circuit is connected with an AV signal input terminal of a digital television; an AV signal input terminal of the digital television set-top box is connected with the AV signal output terminal of the television through video cables; and the output terminal of the monitoring circuit is connected with a power-supply circuit of the digital television set-top box. The utility model has the advantages of low cost, few peripheral devices, and electrical energy conservation.

Description

Reduce the system of digital television set-top box power consumption

Technical field

The utility model relates to a kind of digital TV set-top box, especially a kind ofly can reduce digital television set-top box power consumption, it can be cut off the electricity supply when not needing received television signal automatically reach energy-conservation purpose system, specifically a kind of system that reduces digital television set-top box power consumption.

Background technology

As everyone knows, at present, along with the development of electronic technology, computer technology and information technology, the digitlization of television system is the trend of inevitable development.Digital television signal has begun to have opened to users, State Administration of Radio, Film and Television is popularized set-top box DVB-C in each big city, the whole nation, allow people really enjoy Digital Television and bring benefit, but, do not notice that the use meeting brings unnecessary economic waste to people's life, present user has been accustomed to analog signal and directly has been inserted on the television set, be accustomed to TV office, often ignored external set-top box power supply, the electric energy of more than 20 watt of set-top box is being worked for a long time, electric energy in vain waste like this, also the performance to machine produces very lossy.In the face of global energy situation in short supply, everybody advocating the saving energy, puts and ends to waste.This also is to have defective in the product design, can not play Based Intelligent Control set-top box power supply, brings convenience part for the user uses.

Summary of the invention

The purpose of this utility model be at existing digital TV set-top box because of forgetting the long-term work of cutting off the electricity supply and cause waste of energy and influence the problem of its life performance, design a kind of can be when television set not be watched the system of the reduction digital television set-top box power consumption of automatic cutting off table top box power supply.

The technical solution of the utility model is:

A kind of system that reduces digital television set-top box power consumption, it comprises supervisory circuit, the signal input part of this supervisory circuit connects the AV signal input part on the digital TV set-top box, AV signal input part on the digital TV set-top box links to each other with AV signal output part on the television set by video line, and the output of supervisory circuit connects the power circuit of digital TV set-top box.

Described supervisory circuit is made up of signal processing chip IC1 and power supply control chip IC2, the 2nd pin of described signal processing chip IC1 connects the AV signal input part of digital TV set-top box as the signal input part of supervisory circuit, the 3rd pin of signal processing chip IC1 is as the signal input part of field sync signal output termination power supply control chip IC2, and the control output end of power supply control chip IC2 is the CTL end as the control end that the output of whole supervisory circuit connects the power circuit of digital TV set-top box.

The beneficial effects of the utility model:

The utility model is fully reflected energy-saving and cost-reducing theory from energy-conservation angle, not only for the user has saved use cost, and can prolong the useful life of set-top box.The hardware cost that is adopted is low, and peripheral components is few, and simple to operate, and workload is little, easily realizes.Not only for the user saves electric energy, and can play the function of Based Intelligent Control shutdown.

The utility model also can be widely used in other the digital broadcast machine such as digital signal output equipments such as DVD, VCD player.

Description of drawings

Fig. 1 is a structured flowchart schematic diagram of the present utility model.

Fig. 2 is the electrical schematic diagram of supervisory circuit of the present utility model.

Fig. 3 realizes field sync period waveform schematic diagram of the present utility model.

Fig. 4 is the software flow schematic diagram of originally joining with the utility model.

Embodiment

Below in conjunction with drawings and Examples the utility model is further described.

Shown in Fig. 1～4.

A kind of system that reduces digital television set-top box power consumption, it comprises supervisory circuit, the signal input part of this supervisory circuit connects the AV signal input part on the digital TV set-top box, AV signal input part on the digital TV set-top box links to each other with AV signal output part on the television set by video line, the output of supervisory circuit connects the power circuit of digital TV set-top box, as Fig. 1 institute method.

Described supervisory circuit is made up of signal processing chip IC1 and power supply control chip IC2, as shown in Figure 2, the 2nd pin of described signal processing chip IC1 connects the AV signal input part of digital TV set-top box as the signal input part of supervisory circuit, the 3rd pin of signal processing chip IC1 is as the signal input part of field sync signal output termination power supply control chip IC2, and the control output end of power supply control chip IC2 is the CTL end as the control end that the output of whole supervisory circuit connects the power circuit of digital TV set-top box.

Have LM1881N chip IC 1 in the supervisory circuit of present embodiment, the capable field sync signal of this chip IC 1 energy separating video signal (AV), the 2nd pin of this chip is a video input signals, 3 pin are field sync signal outputs, this pin is directly received the P3.4 mouth of power supply control chip IC2 (can adopt single chip computer AT 89C51), the 6th pin and connection electrical resistance and electric capacity are regularly the parameters in the cycle of field synchronization, and 8 pin are supply power voltage+5V of chip IC 1, and physical circuit as shown in Figure 2.Consider that capable synchronous head pulsewidth has only 4.7us, and the field sync signal pulsewidth is near 160us, the cycle is 20ms. pulsewidth wide more (oscillogram as shown in Figure 3), and it is accurate more to count, and is not subject to disturb, and produces misoperation.Therefore the P3.4 that has selected for use the field synchronization pulsewidth output pin V sync of IC1 to be connected on chip IC 2 mouth that regularly counts.

In program initialization, to set P3.4 for regularly interrupting inlet:

COUNT?EQU?40H

ORG?000BH

LJMP?TIME0

ORG?0100H

MAIN：……

……

MOV?TCON#50H

MOV?TLO，#O

MOV?TH0，#1FH

……

LJMP?MAIN

Can set in the program of in AT89C51 chip IC 2, installing every (V SYNC) pulse synchronously of 5 minutes inspection primary fields, and the high level pulse that regularly counts in a minute is about between the 49-51.If umber of pulse is arranged, just checked once every 5 minutes again; If numeration is zero, the acrotism strokes per minute, then be judged as no AV signal input, just there is not field sync signal output yet, and then one minute once sampling umber of pulse of timing, relatively two times result is zero, the CTL pin level that the P1.2 of single chip computer AT 89C51 controls immediately with the set-top box power supply draws to low, supervisory control system thinks that television set is in off-mode, can make it be in holding state the set-top box dump.Particular flow sheet as shown in Figure 4.

Implementation method of the present utility model is:

At first, go up video signal input interface of increase in digital TV set-top box (DVB), as shown in Figure 1;

Secondly, consider that existing television set all has the AV output interface, this interface is that television set is exported to the monitor scope use with in progress program, seldom use at ordinary times, therefore can utilize television set AV output signal to connect input interface to set-top box AV, this video signal input interface is linked to each other with a monitoring videosignal circuit (as Fig. 2), this monitoring videosignal circuit is linked to each other with the power circuit of digital TV set-top box;

The 3rd, video signal input interface newly-increased on the video output signals interface number digital TV set-top box on the television set is linked to each other with video line;

The 4th, if the monitoring videosignal circuit monitoring outputs to digital TV set-top box really in the video signal input interface to the video output signals interface of television set no signal in the time span of setting, then the power circuit to digital TV set-top box sends signal, power supply with timely number defined by cut word TV set-top box, make digital TV set-top box when received television signal not, cut off the electricity supply automatically, reach the purpose that reduces power consumption.When the user uses the DVB-C set-top box, the AV video of set-top box is exported to television set, the user just can watch programs of set-top box, and whether set-top box DVB-C also has AV output at monitoring television simultaneously.If television set standby or off-mode just do not have AV output, that part of supervisory circuit in the set-top box DVB-C just can monitor, thereby transfers set-top box DVB-C operating state to holding state by work.

The utility model does not relate to the part prior art that maybe can adopt all same as the prior art to be realized.

Claims

1, a kind of system that reduces digital television set-top box power consumption, it is characterized in that it comprises supervisory circuit, the signal input part of this supervisory circuit connects the AV signal input part on the digital TV set-top box, AV signal input part on the digital TV set-top box links to each other with AV signal output part on the television set by video line, and the output of supervisory circuit connects the power circuit of digital TV set-top box.

2, the system of reduction digital television set-top box power consumption according to claim 1, it is characterized in that described supervisory circuit is made up of signal processing chip IC1 and power supply control chip IC2, the 2nd pin of described signal processing chip IC1 connects the AV signal input part of digital TV set-top box as the signal input part of supervisory circuit, the 3rd pin of signal processing chip IC1 is as the signal input part of field sync signal output termination power supply control chip IC2, and the control output end of power supply control chip IC2 is the CTL end as the control end that the output of whole supervisory circuit connects the power circuit of digital TV set-top box.