CN201657158U - Automatic television turning-on circuit in response to urgent messages and television - Google Patents

Abstract

The utility model discloses an automatic television turning-on circuit in response to urgent messages and a television, which comprise a real-time clock control chip. A power end of the real-time clock control chip is connected with a power supplying terminal of a television battery. When the television is in off state and reaches set time, the real-time clock control chip outputs timed turning-on signals to control a switch circuit to conduct a switch access of the switch circuit in series connection between the power supplying terminal of the battery and a power interface of a television system circuit so as to supply power for each functional module in the system circuit. By starting partial system circuit in the television in a timing manner, the automatic television turning-on circuit receives and detects whether the urgent messages are broadcast or not, automatically controls the television to be turned on when the urgent messages are broadcast and leads the television to play important messages such as urgent broadcasts or urgent news and the like, thereby not only meeting the requirement of the mobile television on the function of timely responding to the urgent messages, but also realizing substantial reduction of power consumption of the whole television, saving battery energy and prolonging work time of the mobile television in one-time charging.

Description

A kind of television set automatic boot circuit and television set that responds emergence message

Technical field

The utility model belongs to the TV receiving apparatus technical field, specifically, relates to a kind ofly when broadcasting emergency information, can control boot-strap circuit that television system starts and the television receiver that adopts described automatic boot circuit design automatically.

Background technology

Along with the fast development of TV receiving apparatus, the mobile TV of the hand-held form of a kind of small size more and more is subjected to liking of consumers in general, such as the CMMB mobile TV product of domestic broadcasting and TV and international DTMB mobile TV product etc.The appearance of hand-held mobile TV has redefined consumer's habits and customs, has not only increased enjoyment for dull life, and has turned on the window of another road TV to spectators.

Present hand held television machine generally need have the function of important informations such as regularly detecting urgent broadcast, urgent news.But, size of hand held television machine (as 7 cun, 8 cun, 5 cun, 4.3 cun, 3.5 cun etc.) and the system power dissipation all far above mobile phone.Therefore general hand held television product, its battery power consumption can not be in power on mode constantly usually at 3 to 4 hours as mobile phone.So, how to guarantee that the hand held television machine can receive emergence message in time, exactly, and reduce system power dissipation to greatest extent, just become the subject matter that present research and development manufacturer of handing mobile TV need solve.

The utility model content

The utility model is in order to realize the timely response of hand-held mobile TV to important informations such as urgent broadcasts, provide a kind of and can regularly detect emergence message, and when emergence message is arranged, control the boot-strap circuit that television system starts operation automatically, to have reduced system power dissipation to greatest extent.

In order to solve the problems of the technologies described above, the utility model is achieved by the following technical solutions:

A kind of television set automatic boot circuit that responds emergence message, comprise a real-time clock control chip, the power end of described real-time clock control chip connects the power supply terminal of television set battery, when television set is in off-mode and arrives setting-up time, it is connected on switch ways between the power interface of described powered battery terminal and system for TV set circuit the one switching circuit conducting of output timing start-up signal controlling, is each functional module power supply in the circuit system.

Further, the timing start-up signal of described real-time clock control chip output transfers to the master chip in the system for TV set circuit, the tuner receiving broadcast signal in the master chip start-up system circuit.

When the broadcast singal that receives detecting when described master chip is emergence message, output start-up command each functional module to the circuit system, control machine system start operation starts the contour power consumption device of display screen, plays emergence message to the consumer.And if the broadcast singal that receives is when being non-urgent information, then master chip output timing enabled instruction by bus transfer to described real-time clock control chip, control real-time clock control chip restarts timing, and meanwhile the control system circuit reenters shutdown, to reduce system power dissipation.

Preferably, described master chip preferably passes through I²The C bus connects described real-time clock control chip, the real-time clock control chip is carried out start and stop control.

Further again, in described switching circuit, include a P-channel field-effect transistor (PEFT) pipe, the grid of described P-channel field-effect transistor (PEFT) pipe receives the timing start-up signal of described real-time clock control chip output, and is connected with the power supply terminal of battery; The source electrode of field effect transistor connects the power supply terminal of described battery, and drain electrode connects the power interface of described system for TV set circuit.

Certainly, described switching circuit also can adopt two P-channel field-effect transistor (PEFT) pipes and a NPN type triode design to realize; The grid of the described first P-channel field-effect transistor (PEFT) pipe is connected the timing start-up signal output part of real-time clock control chip, and be connected with the power supply terminal of battery, its source electrode connects the power supply terminal of described battery, and drain electrode connects the base stage of described NPN type triode; The grounded emitter of described NPN type triode, collector electrode connects the grid of the second P-channel field-effect transistor (PEFT) pipe; The grid of the described second P-channel field-effect transistor (PEFT) pipe and source electrode are connected the power supply terminal of described battery simultaneously, and drain electrode connects the power interface of described system for TV set circuit.

In order to guarantee that circuit system can access continued power during operation, with the base stage of described NPN type triode simultaneously connected system circuit master chip be used for the terminal of output system operating state, thereby continue conducting by master chip control switch circuit.

Further again, the timing start-up signal output part of described real-time clock control chip connects the base stage of a NPN type triode, the grounded emitter of described triode, and collector electrode connects DC power supply on the one hand, on the other hand the master chip in the connected system circuit.

Based on above-mentioned automatic boot circuit, the utility model provides a kind of television set that adopts described automatic boot circuit design again, by in existing TV set circuit, setting up the real-time clock control chip, utilize the original battery of television set to be its power supply, and when television set is in off-mode and arrives setting-up time, output timing start-up signal controlling is connected on the switching circuit conducting between the power interface of described powered battery terminal and system for TV set circuit, thereby control system for TV set circuit timing start-up is realized the timing of emergence message is detected and response in time.

Compared with prior art, advantage of the present utility model and good effect are: whether the utility model receives and detects and currently have emergence message to broadcast by regularly starting television set middle part subsystem circuit, and when emergence message is arranged automatic control television boot-strap, play important informations such as urgent broadcast or urgent news for the consumer, thereby not only satisfied the timely response function of mobile television to emergence message, and realized the reduction significantly of television set Overall Power Consumption, save the energy content of battery, prolonged the operating time that mobile TV once charges.

After reading the detailed description of the utility model execution mode in conjunction with the accompanying drawings, other characteristics of the present utility model and advantage will become clearer.

Description of drawings

Fig. 1 is the circuit theory diagrams of a kind of embodiment of the television set automatic boot circuit of the response emergence message that proposes of the utility model.

Embodiment

Below in conjunction with accompanying drawing embodiment of the present utility model is done explanation in further detail.

The utility model also can respond urgent broadcast in order to realize mobile television in time at off-mode, important informations such as urgent news, on the basis of existing mobile television, set up the timing start-up circuit, by adopting the extremely low real-time clock control chip RTC of power consumption to carry out timing, and then under television set is in shutdown mode, timing controlled is connected the switching circuit conducting between the power interface of television set battery and system for TV set circuit, with that part of circuit that is used for receiving broadcast signal in the start-up system circuit operation that powers on, receiving broadcast signal, and then judge whether current broadcast singal is emergence message.If emergence message, the operation of control system for TV set circuit normal boot-strap is lighted display screen and is play emergence message; If not emergence message then controls the system for TV set circuit again and enters shutdown mode, with save battery power, thereby realized the reduction significantly of Overall Power Consumption, avoided frequent charge to the inconvenience that brings in consumer's use.

Be example with hand-held mobile television below, elaborate the concrete establishment structure and the operation principle thereof of the television set automatic boot circuit of described response emergence message by a specific embodiment.

Embodiment one, and referring to shown in Figure 1, present embodiment adopts RTC chip U1 to carry out timing, and its working power is provided by the battery B1 of television set inside.The DC power supply of the power supply terminal VBAT output by battery B1 is after filter capacitor E1, C1 shaping, the power end VDD that connects RTC chip U1, the power end VDD that perhaps is connected RTC chip U1 with filter capacitor C8 by isolating diode D4, no matter be in start or off-mode, be always RTC chip U1 power supply at television set.When described RTC chip U1 picks up counting, and the configuration informations such as blanking time that regularly start the system for TV set circuit, can be configured by the master chip unification in the circuit system.In the present embodiment, master chip can adopt I²Communication modes such as C bus are connected communication with RTC chip U1, output timing enabled instruction control RTC chip U1 starts working when television set shuts down, and carries out timing; And the circuit system in television set partly starts or when all starting, then export standby command control RTC chip U1 to quit work, to reduce power consumption.

In the present embodiment, RTC chip U1 is by the output of broken ends of fractured bone INT wherein timing start-up signal, and broken ends of fractured bone INT connects switching circuit as the timing start-up signal output part in, and when arriving timing, the control switch circuit turn-on allows the battery be the circuit system power supply.Described switching circuit can adopt multiple version, realizes such as adopting two P-channel field-effect transistor (PEFT) pipe Q2, Q4 and a NPN type triode Q1 to set up, as shown in Figure 1.Wherein, the grid of the first P-channel field-effect transistor (PEFT) pipe Q4 connects the middle broken ends of fractured bone INT of RTC chip U1 on the one hand by resistance R 10, connects the power supply terminal VBAT of batteries on the other hand by resistance R 12.The source electrode of described field effect transistor Q4 connects the power supply terminal VBAT of battery, and drain electrode is connected the base stage of NPN type triode Q1 with the bleeder circuit of being made up of resistance R 3, R4 by diode D1.The grounded emitter of described triode Q1, collector electrode connect the grid of the second P-channel field-effect transistor (PEFT) pipe Q2.The grid of the described second P-channel field-effect transistor (PEFT) pipe Q2 connects the power supply terminal VBAT of battery simultaneously through rc filter circuit R5, C2, source electrode connects the power supply terminal VBAT of battery, and drain electrode is by the power interface VCC of isolating diode D3 connected system circuit.

When television set is in shutdown mode, when RTC chip U1 arrives setting-up time in timing, timing start-up signal by middle broken ends of fractured bone INT output low level, control the first P-channel field-effect transistor (PEFT) pipe Q4 conducting, the direct voltage that battery is exported acts on the grid of triode Q1, control triode Q1 conducting, to drag down the grid potential of the second P-channel field-effect transistor (PEFT) pipe Q2, and then control the second P-channel field-effect transistor (PEFT) pipe Q2 conducting, the current supply circuit that is communicated with battery and circuit system is for each functional module in the circuit system provides operating voltage.

Certainly,, also can directly adopt a P-channel field-effect transistor (PEFT) pipe to carry out circuit design,, and be connected with the power supply terminal VBAT of battery such as the middle broken ends of fractured bone INT that directly grid of field effect transistor Q2 is connected RTC chip U1 in order to simplify the switching circuit structure; The source electrode of field effect transistor Q2 connects the power supply terminal VBAT of battery equally, the power interface VCC of drain electrode connected system circuit.When the effective timing start-up signal of the middle broken ends of fractured bone INT output low level of RTC chip U1, field effect transistor Q2 is because the conducting greater than grid voltage of its source voltage, thereby realized the power supply of battery B1 to circuit system.

Can know accurately that in order further to make circuit system the operation of current system is that start normally moves or moves for the timing that detects emergence message starts, preferably the timing start-up signal that RTC chip U1 is exported transfers to the master chip in the circuit system simultaneously, judges to help master chip.

In the present embodiment, after preferably the timing start-up signal that RTC chip U1 is exported at first carries out the signal processing and amplifying by drive circuit, transfer to master chip again, to guarantee the reliable arrival of signal.The negative circuit design realization that described drive circuit can adopt NPN type triode Q3 to cooperate simple peripheral circuit to form, as shown in Figure 1.The base stage of described NPN type triode Q3 connects the middle broken ends of fractured bone INT of RTC chip U1 on the one hand by resistance R 9, connects the power supply terminal VBAT of batteries on the other hand by resistance R 12; The grounded emitter of NPN type triode Q3, collector electrode connects DC power supply VCC_3V3 by resistance R 11, and is connected with the timing start-up signal reception pin (such as wherein one road I/O mouth of master chip) of master chip.Described DC power supply VCC_3V3 can directly adopt the DC power supply of battery B1 output, also can adopt in the circuit system DC power supply through voltage stabilizing circuit conversion output, and such as 3.3V etc., present embodiment does not specifically limit this.

When RTC chip U1 when timing arrives setting-up time, the effective timing start-up signal of output low level, at this moment, NPN type triode Q3 changes cut-off state into by conducting state, by its collector electrode to master chip output high level signal RTC_INT.Master chip is when detecting the RTC_INT signal and be high level, and the tuner in the control system circuit starts, receiving broadcast signal.Then do not start operation as the contour power consumption device of display screen, to reduce system power dissipation to greatest extent.Described tuner with the broadcast singal demodulation that receives after, transfer to master chip and carry out decoding processing, whether be emergence message to judge current broadcast; If, sending start-up command each functional module to the circuit system, start each functional module start operation, play urgent broadcast; If not emergence message then at first passes through I²C bus notice RTC chip U1 picks up counting, and sends shutdown command each functional module to the circuit system then, and the control system circuit reenters shutdown mode, to reduce power consumption.

For the working power that makes circuit system can obtain to continue at run duration, master chip is exported high level efficient system working state signal POWER_EN at the run duration that powers on by one road I/0 mouth, transfer to triode Q1 through diode D2, control triode Q1 conducting, and then keep the conducting state of P-channel field-effect transistor (PEFT) pipe Q2.And for the switching circuit of direct employing P-channel field-effect transistor (PEFT) pipe Q2 design, then should be in the run duration that powers on control P-channel field-effect transistor (PEFT) pipe Q2 at master chip and keep conducting state by the grid of master chip output low level efficient system working state signal POWER_EN to P-channel field-effect transistor (PEFT) pipe Q2.

When the consumer starts television boot-strap by the start button on the trigger television, master chip detects the triggering state of start button, generate efficient system working state signal POWER_EN control switch circuit turn-on on the one hand, and the start-up system circuit enters the start operational mode; Export standby command on the other hand and transfer to RTC chip U1, control RTC chip U1 stops timing.

Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.

Claims (10)

1. television set automatic boot circuit that responds emergence message, it is characterized in that: comprise a real-time clock control chip and a switching circuit, the power end of described real-time clock control chip connects the power supply terminal of television set battery, when television set was in off-mode and arrive setting-up time, it was connected on switch ways between the power interface of described powered battery terminal and system for TV set circuit the conducting of output timing start-up signal control switch circuit.

2. the television set automatic boot circuit of response emergence message according to claim 1, it is characterized in that: the timing start-up signal of described real-time clock control chip output transfers to the master chip in the system for TV set circuit, the tuner receiving broadcast signal in the master chip start-up system circuit.

3. the television set automatic boot circuit of response emergence message according to claim 2 is characterized in that: described master chip when detecting broadcast singal and be emergence message, output start-up command each functional module to the circuit system.

4. the television set automatic boot circuit of response emergence message according to claim 3, it is characterized in that: described master chip is when detecting broadcast singal and be non-urgent information, output timing enabled instruction by bus transfer to described real-time clock control chip, and control system circuit shutdown.

5. the television set automatic boot circuit of response emergence message according to claim 4 is characterized in that: described bus is I²The C bus.

6. according to the television set automatic boot circuit of each described response emergence message in the claim 1 to 5, it is characterized in that: in described switching circuit, include a P-channel field-effect transistor (PEFT) pipe, the grid of described P-channel field-effect transistor (PEFT) pipe receives the timing start-up signal of described real-time clock control chip output, and is connected with the power supply terminal of battery; The source electrode of field effect transistor connects the power supply terminal of described battery, and drain electrode connects the power interface of described system for TV set circuit.

7. according to the television set automatic boot circuit of each described response emergence message in the claim 1 to 5, it is characterized in that: in described switching circuit, include two P-channel field-effect transistor (PEFT) pipes and a NPN type triode; The grid of the described first P-channel field-effect transistor (PEFT) pipe connects the timing start-up signal output part of real-time clock control chip, and is connected with the power supply terminal of battery, and its source electrode connects the power supply terminal of described battery, and drain electrode connects the base stage of described NPN type triode; The grounded emitter of described NPN type triode, collector electrode connects the grid of the second P-channel field-effect transistor (PEFT) pipe; The grid of the described second P-channel field-effect transistor (PEFT) pipe and source electrode are connected the power supply terminal of described battery simultaneously, and drain electrode connects the power interface of described system for TV set circuit.

8. the television set automatic boot circuit of response emergence message according to claim 7 is characterized in that: the base stage connected system circuit master chip of described NPN type triode is used for the terminal of output system operating state.

9. according to the television set automatic boot circuit of each described response emergence message in the claim 1 to 5, it is characterized in that: the timing start-up signal output part of described real-time clock control chip connects the base stage of a NPN type triode, the grounded emitter of described triode, collector electrode connects DC power supply on the one hand, on the other hand the master chip in the connected system circuit.

10. a television set is characterized in that: include the television set automatic boot circuit as the described response emergence message of each claim in the claim 1 to 9.

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