Summary of the invention
The object of the invention is to provide a kind of set-top box of low standby power loss, is intended to solve under the prior art, and the standby energy consumption of set-top box is difficult to reach the requirement of Energy Star, and cost is higher, and energy-saving effect is problem of unstable also.
The present invention realizes like this, a kind of set-top box of low-power consumption standby, comprise main power source, this main power source connects an Opportunity awaiting control for linear plate, and this Opportunity awaiting control for linear plate connects electrical network, this Opportunity awaiting control for linear plate comprises: microcontroller, be used for when receiving standby signal, output control disconnects level and gives electronic switch, when receiving the cancellation standby signal, output control turn-on level is given electronic switch, and described microcontroller adopts single-chip microcomputer to realize; Electronic switch is used for disconnecting or connecting being connected of electrical network and main power source according to the control level of microcontroller; And the auxiliary electric power supply module, be used to change line voltage and become direct voltage, supply direct current to microcontroller and electronic switch;
The auxiliary electric power supply module of described Opportunity awaiting control for linear plate comprises transformer, full-wave bridge rectifier circuit, capacitor filter and the voltage stabilizing circuit that connects successively;
Described voltage stabilizing circuit is specially: earlier by three resistance series connection back ground connection, two resistance before this series circuit earth terminal are in parallel with electric capacity, the contact place of two resistance of two resistance parallel branches connects the adjustable voltage-stabiliser tube reference edge of three ends, the ground termination voltage-stabiliser tube positive pole of parallel circuits, another termination voltage-stabiliser tube negative pole of parallel circuits, the two ends of parallel circuits are as the output of auxiliary electric power supply module.
The invention has the beneficial effects as follows: during owing to set-top box standby, the power consumption of standby control board is only arranged, and the power of Opportunity awaiting control for linear plate is little, cost is low, and power consumption is stable, therefore, realized the super low-power consumption standby of set-top box at low cost, reached the requirement of Energy Star fully, and energy-saving effect is very stable.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.
In the embodiment of the invention, when set-top box was in standby, Opportunity awaiting control for linear plate cut-out electrical network was connected with the set-top box power supply.The very little energy that consumes when the energy consumption of standby just has only the work of Opportunity awaiting control for linear plate like this and with low cost has satisfied the requirement of Energy Star fully, and power consumption can not be significantly increased in time for a long time yet.
Fig. 1 shows the set-top-box system structure chart of a kind of low-power consumption standby that the embodiment of the invention provides.
Set-top-box system comprises Opportunity awaiting control for linear plate 102, main power source 103, keying panel 104 and mainboard 105.Main power source 103 gives mainboard 105 and keying panel 104 for direct voltage, and each direct voltage port is corresponding to be connected.Corresponding respectively DISPLAY port and the IR port that connects mainboard 105 of the DISPLAYCTRL port of keying panel 104 and IR2 port.Mainboard is used to realize the various functions of set-top box.Serial connection was gone into Opportunity awaiting control for linear plate 102 before main power source 103 was connected with electrical network 101.
Opportunity awaiting control for linear plate 102 is being controlled being connected and disconnection of main power source 103 and electrical network 101.When the set-top box operate as normal, this Opportunity awaiting control for linear plate 102 couples together main power source 103 and electrical network 101.At this moment, main power source 103 will be to mainboard 105 and keying panel power supply 104, and the external world can import various instructions by keying panel, and mainboard is realized the various functions of set-top box according to instruction.When set-top box was in holding state, Opportunity awaiting control for linear plate 102 disconnection main power sources 103 were connected with electrical network 101.At this moment, standby control board 102 is only arranged in work in the set-top box, the electric energy that set-top box consumed is exactly the electric energy that Opportunity awaiting control for linear plate 102 consumes.And the power consumption of Opportunity awaiting control for linear plate 102 is very little, has so just realized the low-power consumption standby of set-top box.
Fig. 2 is the set-top-box system concrete structure figure of a kind of low-power consumption standby of providing of the embodiment of the invention;
As shown in Figure 2, Opportunity awaiting control for linear plate 102 is made up of auxiliary electric power supply module, microcontroller, infrared remote receiver and electronic switch.The auxiliary electric power supply module provides DC power supply for microcontroller, infrared remote receiver and electronic switch.The IR1 port of infrared remote receiver connects the STDB/WORK port of microcontroller.The control level output port of microcontroller connects the control input end of electronic switch.Electronic switch disconnects according to the input control level or connects being connected of electrical network 101 and main power source 103.
It is as follows with the working method of electrical network 101 that Opportunity awaiting control for linear plate 102 realizes being switched on or switched off main power source 103:
Under the set-top box normal operating conditions, after the infrared remote receiver on the Opportunity awaiting control for linear plate 102 receives the standby signal that remote controller sends, just send out STDB (Stand By) signal and carry out the standby action to microcontroller.After the microcontroller of Opportunity awaiting control for linear plate is received the STDB signal, send CTRL (Control) control port that the control standby level is given electronic switch, cut off the route of electrical network to the main power source power supply by electronic switch from the ON/OFF port of microcontroller.Like this, set-top box just has been in holding state.Whole set-top box just has only Opportunity awaiting control for linear plate 102 in power consumption.The work of Opportunity awaiting control for linear plate 102 is by keeping with the direct-connected auxiliary power supply module for power supply of electrical network.The power consumption of Opportunity awaiting control for linear plate 102 is minimum, so just greatly reduces the power consumption of set-top box standby, reaches the requirement of Energy Star fully.
Make set-top box return to normal operating conditions, only need remote controller to send to remove on the infrared remote receiver of standby signal in the Opportunity awaiting control for linear plate by holding state.Infrared remote receiver just sends the WORK signal to microcontroller.After the microcontroller of readiness control circuit is received the WORK signal, send the CTRL control port that the Control work level is given electronic switch from the ON/OFF port of microcontroller, by the path that the electronic switch closes electrical network is connected with main power source, the end standby.Set-top box has just restarted work.
Fig. 3 shows the preferred inner particular circuit configurations of Opportunity awaiting control for linear plate.
Opportunity awaiting control for linear plate 102 is made up of auxiliary electric power supply module, microcontroller, infrared remote receiver and electronic switch.The auxiliary electric power supply module provides DC power supply for microcontroller, infrared remote receiver and electronic switch.The IR1 port of infrared remote receiver connects the STDB/WORK port of microcontroller.The control input end of the control level output termination electronic switch of microcontroller.Electronic switch disconnects according to control level or connects being connected of family expenses electrical network and main power source.
The auxiliary electric power supply module is made up of transformer, rectification circuit, filter circuit and voltage stabilizing circuit four parts.Line voltage becomes direct current by rectification circuit with AC rectification after the transformer transformation, handle output DC source, back to microcontroller, infrared remote receiver and electronic switch through filtering and voltage stabilizing circuit again.
Transformer T1 is used for the household voltage transformation to suitable voltage as microcontroller power supply.Because concrete household voltage is in different countries and regions differences, be 220V such as the alternating voltage of the household voltage of China, and the alternating voltage of the household voltage of Japan is 100V, so selecting for use of transformer need be selected according to actual conditions.What rectification circuit adopted is full-wave bridge rectifier circuit.Filter circuit is capacitor C 1 filter circuit.
Voltage stabilizing circuit is made up of divider resistance, the adjustable voltage-stabiliser tube of three ends and filter capacitor.Resistance R 1 constitutes the bleeder circuit of connecting with R2, R3.Resistance R 2 and R3 divide direct voltage flow to microcontroller, infrared remote receiver and electronic switch.The reference edge of three ends are adjustable voltage-stabiliser tube D5 is connected between two resistance of resistance R 2, R3 branch road, and positive pole is connected on the earth terminal of resistance R 2, R3 branch road, and negative pole is connected on the other end of resistance R 2, R3 branch road.Get voltage when excessive at resistance R 2, R3 branch road, three ends are adjustable voltage-stabiliser tube D5 is with conducting, and the electrorheological that flows through resistance R 1 is big, and it is big that resistance R 1 dividing potential drop also just becomes, and resistance R 2, R3 branch voltage will diminish.Get voltage when too small at resistance R 2, R3 branch road, not conducting of voltage-stabiliser tube D5 that three ends are adjustable is because capacitor C 2 is connected on the two ends of resistance R 2, R3 branch road to resistance R 2, R3 branch road power supply stream, so resistance R 2, R3 branch voltage can only slowly diminish.
In the present embodiment, three ends are adjustable, and voltage-stabiliser tube D5 selection model is the adjustable voltage-stabiliser tube of three ends of TL431, voltage between its reference edge and the positive pole is 2.5 volts of constant magnitudes of voltage, and the burning voltage of exporting under the resistance R 2 that the negative, positive utmost point of voltage-stabiliser tube connects, the R3 branch road normal condition is 2.5 * (R2+R3)/R3 volt.
Person of skill in the art will appreciate that the physical circuit of auxiliary electric power supply module has a variety of forms, such as, rectification circuit can be used half-wave rectifying circuit; Filter circuit can have a plurality of filter capacitors; Three-terminal voltage-stabilizing pipe in the voltage stabilizing circuit can be selected the voltage-stabiliser tube of other model for use.These variations can both realize the object of the invention.
Microcontroller, its STDB/WORK port receives the signal of the IR1 port of infrared remote receiver, and when receiving standby signal, output control disconnects level and gives electronic switch, and when receiving the cancellation standby signal, output control turn-on level is given electronic switch.
Microcontroller generally adopts single-chip microcomputer to realize.The single-chip microcomputer of selecting for use only need possess simple function, but withstand voltage scope should be very wide, and power consumption is extremely low.
Infrared remote receiver is used for receiving the instruction of remote controller, signals to microcontroller from the IR1 port then and carries out.The Opportunity awaiting control for linear plate uses separately an infrared remote receiver, helps the stable reception of signal and avoids interference.
Electronic switch is to be made of relay, triode Q1 and resistance R 4.Wherein resistance R 4 one terminates at the base stage of triode Q1, and the other end fetches control level output from microcontroller as the Ctrl port of electronic switch.The grounded emitter of triode Q1, the input of collector connecting relay.Like this, when microcontroller was exported high or low level, corresponding triode Q1 was with conducting or end.In the embodiment of the invention, select the normally-closed contact electromagnetic relay for use.Electromagnetic relay input control end correspondence connects the DC power supply of auxiliary electric power supply module output and the collector electrode of triode.Like this, the high or low level of the Ctrl port of electronic switch input determines the conducting of triode Q1 or ends.During the high level of the Ctrl port of electronic switch input, triode Q1 conducting, the input of electromagnetic relay has voltage difference, coil also just has electric current to produce, thereby make iron core produce electromagnetic attraction, draw back switch, reach the purpose that control electrical network and main power source connecting circuit disconnect.In like manner, when the low level of the Ctrl of electronic switch port input, triode Q1 ends, and the input of electromagnetic relay does not have voltage difference, does not have electric current yet, and iron core does not just have electromagnetic attraction yet, and switch returns to closure state, electrical network and the conducting of main power source connecting circuit.
Person of skill in the art will appreciate that electronic switch also can be realized the object of the invention with other circuit.Such as, relay can adopt the normally opened contact electromagnetic relay; Triode can replace with field effect transistor.
Except that above-mentioned specifying, the those of ordinary skill of benefiting from this announcement as can be seen can be with different circuit structure realization Opportunity awaiting control for linear plates, and these circuit do not depart from the scope of the present invention.
In the present embodiment, the energy consumption of Opportunity awaiting control for linear plate is the stack of auxiliary electric power supply module, microcontroller, infrared remote receiver and electronic switch institute consumed power.The element of auxiliary electric power supply module and electronic switch is simple, and energy consumption is all very little.Microcontroller is the comparatively simple single-chip microcomputer of function.This single-chip microcomputer and infrared remote receiver can be selected the minimum product of power consumption for use.The energy consumption of whole like this Opportunity awaiting control for linear plate is just very little, and time length does not have tangible increase yet.
In the embodiment of the invention, when set-top box standby, cut off being connected of electrical network and main power source by the Opportunity awaiting control for linear plate.Like this, the stand-by power consumption of set-top box is exactly the electric energy that the Opportunity awaiting control for linear plate is consumed.And Opportunity awaiting control for linear plate circuit structure is simple, and selects the element of low-power consumption for use, is easy to just reach the requirement of Energy Star, has realized the standby of set-top box super low-power consumption.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.