CN1825982A - Fault detecting and warning circuit for TV set - Google Patents
Fault detecting and warning circuit for TV set Download PDFInfo
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- CN1825982A CN1825982A CN 200510131137 CN200510131137A CN1825982A CN 1825982 A CN1825982 A CN 1825982A CN 200510131137 CN200510131137 CN 200510131137 CN 200510131137 A CN200510131137 A CN 200510131137A CN 1825982 A CN1825982 A CN 1825982A
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Abstract
This invention discloses a fault test and alarm circuit for TV including a master MCU, an optical unit and a fan, in which, two high and low level signal input ends of said MCU are connected with the control signal output ends of a fan state test circuit and a temperature sensor, the bus end of the master MCU system is connected with the bus end of the optical unit by the IIC bus line, the control signal output of the master MCU is connected with the control signal input end of a mono-chip processor, which is connected with switch signal input end of the supply board circuit and an indication light circuit, which timely alarms the fault kinds by the indication circuit so as to realize the effective management to the overall supply and accurate adjustment.
Description
Technical field
The present invention relates to a kind of improvement of TV set circuit, specifically, relate to a kind of being applied in the TV set circuit, the complete machine power supply is managed, the various most common failures of testing circuit simultaneously, and the control circuit of reporting to the police respectively at different faults.
Background technology
At present, in general TV set circuit, the stand-by power consumption of complete machine can be bigger, greater than 5 watts, do not reach requirements of saving energy usually.And in the process of tv product operation; faults such as temperature is too high, fan unusual, Communications failure also appear through regular meeting; if can not judge and get rid of these faults in time; can make the complete machine decreased performance; when serious even can cause the damage of equipment, influence consumer's normally watching to TV programme.Meanwhile, when unusual condition appearred in equipment, owing to lack necessary failure diagnosis and warning circuit in the equipment, therefore, it was any fault that the technical staff often is difficult to judge in time, brought difficulty for the inspection maintenance work of equipment.
Summary of the invention
The present invention is in order to solve in the prior art in the television devices owing to lack necessary failure diagnosis and warning circuit; thereby make mechanical disorder be difficult to judge; the problem of making troubles for technical staff's examination and maintenance work; fault detect of a kind of novel TV machine and warning circuit are provided; by in TV set circuit, setting up simple testing circuit; common faults in the television set is detected in real time; and with testing result by the indicator light circuit output of reporting to the police in real time; not only effectively protect television devices, and made things convenient for technical staff's inspection maintenance work.
For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of fault detect of television set and warning circuit, comprise main MCU, ray machine and fan, two high-low level signal input parts of described main MCU connect the control signal output ends of fan-status testing circuit and temperature sensor respectively, and the system bus end of main MCU links to each other with the bus end of ray machine by iic bus; The control signal output ends of described main MCU connects the signal input end of a single-chip microcomputer, and described single-chip microcomputer connects the switching on and shutting down signal input part and the indicator light circuit of power panel circuit respectively according to the control signal that receives by its different GPIO mouth.
As the further qualification to technique scheme, the control signal output ends of described main MCU connects one of them GPIO mouth of single-chip microcomputer, and described GPIO mouth links to each other with indicator light circuit simultaneously.Include a NPN type triode in described indicator light circuit, the base stage of described triode connects the GPIO mouth of described single-chip microcomputer, and collector electrode connects a direct current power supply, and emitter connects the positive pole of a light-emitting diode, the minus earth of described light-emitting diode.
As further limiting again to technique scheme, in described fan-status testing circuit, the fan state test side connects the control end of a controllable switch element, and the gating end of described controllable switch element is according to high-low level signal input part output high level signal or the low level signal of its on off state to main MCU.In the present invention, described controllable switch element adopts a NPN type triode to realize, the base stage of described triode connects the fan state test side, and connect a direct current power supply by pull-up resistor, the grounded emitter of described triode, collector electrode connects DC power supply through resistance on the one hand, links to each other with the high-low level signal input part of main MCU on the other hand.
As the further qualification again to technique scheme, described temperature sensor adopts a thermal resistance temperature sensor to realize that the control signal output ends of described transducer connects one of them high-low level signal input part of main MCU through resistance.It is that the integrated chip of PW318 realizes that the model of single-chip microcomputer is PIC12F629 that described main MCU adopts a model, and the interrupt signal output of described single-chip microcomputer connects the interrupt signal end of main MCU through resistance, and its COUT port connects remote control switch interface.Switching on and shutting down button one end ground connection, the other end links to each other with one of them GPIO mouth of single-chip microcomputer.Described single-chip microcomputer by an one GPIO mouth output reset signal, connects the reset terminal of main MCU for realizing watchdog function through the switch MOS pipe; The grid of described metal-oxide-semiconductor connects a direct current power supply on the one hand, connects the reset terminal of main MCU on the other hand through a resistance, and its drain electrode connects the GPIO mouth of described single-chip microcomputer, and source electrode connects the reset terminal of main MCU; The reset terminal of described main MCU is also through a normal open switch ground connection.
Compared with prior art; advantage of the present invention and good effect are: the present invention is by setting up fan running status testing circuit and temperature sampling circuit on the automatically controlled plate of television set; respectively fan ruuning situation and the temperature inside the box in the cabinet are detected in real time; and carry out communication by iic bus and ray machine; communication condition is detected; control single chip computer in time turn-offs main power source when breaking down; and by indicator light circuit failure mode being carried out Realtime Alerts shows; thereby realized to effective management of complete machine power supply and to the accurately and timely judgement of failure mode; not only effectively protected television devices; reduce Overall Power Consumption, and greatly facilitated technical staff's inspection maintenance work.
Description of drawings
Fig. 1 is that television fault detects and the theory diagram of warning circuit among the present invention;
Fig. 2 is that the present invention is the fault detect that realizes television set and a kind of physical circuit connection layout that warning function proposes;
Fig. 3 is system's occurrence temperature when surpassing the limited range fault, the pulse sequence signal that main MCU sends to single-chip microcomputer;
Fig. 4 is a fan when breaking down, the pulse sequence signal that main MCU sends to single-chip microcomputer;
When Fig. 5 is system board and ray machine generation communication failure, the pulse sequence signal that main MCU sends to single-chip microcomputer.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is done explanation in further detail.
Fault detect of the present invention and warning circuit are mainly by main MCU and chip microcontroller, it is the integrated chip realization of PW318 that wherein main MCU adopts model, single-chip microcomputer adopts the PIC12F629 chip of MICROCHIP company to realize that its schematic block circuit diagram is referring to shown in Figure 1.
Among Fig. 1, the 1 pin VDD of single-chip microcomputer N34 is a power end, the connection power panel+the 5V standby power, and through filter capacitor C391 ground connection.8 pin VSS are earth terminal, are connected with the earth.4 pin GP3 are one of them GPIO mouth of single-chip microcomputer N34, connect switching on and shutting down button P3 through resistance R 257.5 pin COUT ports connect the remote control switch interface through resistance R 265.When television boot-strap, press switching on and shutting down button P3 or export start-up command by remote controller, after the GP3 termination of single-chip microcomputer N34 receives that button starting-up signal or COUT port receive the remote-controlled start-up signal, 7 pin GP0 by single-chip microcomputer N34 send high level signal control power panel switching on and shutting down control section, make power panel be in normal operating conditions, finish boot action.When television set shuts down, after the GP3 termination of single-chip microcomputer N34 receives that button off signal or COUT port receive the remote-control closedown signal, GP0 end by single-chip microcomputer N34 sends low level signal control power panel switching on and shutting down control section, makes power panel be in holding state, finishes the shutdown action.
The 2 pin GP5 of single-chip microcomputer N34 are signal input end, receive the fault diagnosis signal that main MCU sends, and the indicator light circuit of described fault-signal by as shown in Figure 1 carried out alarm indication.In described indicator light circuit, the GP5 end of single-chip microcomputer N34 connects the base stage of a NPN type triode V8 through resistance R 259, R261, the collector electrode of described triode V8 is through resistance R 262 connection+5V standby powers, and emitter is through resistance R 263, light-emitting diode D40 ground connection.Annexation between described single-chip microcomputer N34 and the main MCU is referring to shown in Figure 2.
Among Fig. 2, the PORTA4 of main MCU end is through the control signal output ends of resistance R 12 connection thermal resistance temperature sensor T500, and described temperature sensor detects in real time to the temperature in the tv chassis, and its design temperature is 60 degree.When detected temperatures is lower than 60 when spending, transducer T500 disconnects; When detected temperatures is higher than 60 when spending, transducer is communicated with, and forms the different voltage status of height with this at PORTA4 of main MCU end, the temperature regime of reflection cabinet inside.
The PORTA3 end of main MCU connects fan running status testing circuit through resistance R 303, and in described testing circuit, inserting sub-XSA13 is the gang socket of fan, and PIN1 connects the power end of fan, PIN2 ground connection, and PIN3 connects the fan state test side.+ 12V DC power supply is through filter capacitor CA15, CA149 ground connection, and the ripple on the filter out power is for fan provides stable working power.Insert the base stage of the PIN3 pin of sub-XSA13 through switching diode DA7, resistance R A147 connection NPN type triode VA17, and through pull-up resistor RA138 connection+12V DC power supply.The grounded emitter of described NPN type triode VA17, collector electrode connects the PORT COM PORTA3 of main MCU, i.e. main MCU GPIO mouth on the other hand on the one hand through resistance R A146 connection+5V DC power supply through divider resistance R303.When fan running just often, the fan state test side is by PIN3 output low level signal, at this moment the base voltage of triode VA17 is a low level, triode VA17 ends, + 5V DC power supply makes it be high level state, according to the communications protocol of this circuit module and main MCU by the PORTA3 end that resistance R A146, R303 affact main MCU, this expression fan operation is normal, the complete machine continuous firing.If fan breaks down, stop operating, high level is exported by PIN3 in the fan state test side, + 12V DC power supply affacts the base stage of triode VA17 by resistance R A138, RA147, controls its conducting, and the PORTA3 end that makes main MCU is through resistance R 303 ground connection, be low level state, according to the communications protocol of this circuit module and main MCU, this expression fan breaks down, and stops operating.
In addition, the PORTA0 of main MCU, PORTA1 end links to each other by bus end SDA, the SCL of iic bus with ray machine (display screen), when main MCU and ray machine carried out communication, main MCU sent data-signal to ray machine, and ray machine sends answer signal to main MCU after receiving data-signal.After main MCU sends data-signal in a period of time,, think that then system and ray machine communication break down if do not receive the answer signal that ray machine sends.
When any one of above-mentioned three kinds of faults took place in system, main MCU sent different pulse signal through resistance R 302, R259 to the GP5 of single-chip microcomputer N34 end by its PORTA2 port according to the difference of failure mode.When temperature exceeded limited range, main MCU sent as shown in Figure 3 pulse sequence signal to single-chip microcomputer N34; When fan broke down, main MCU sent pulse sequence signal as shown in Figure 4; When system board and ray machine communication were broken down, main MCU sent pulse sequence signal as shown in Figure 5.After the GP5 of single-chip microcomputer N34 termination is received this signal, send interrupt signal through resistance R 258, R25 to the interrupt signal end IRRCVR1 of main MCU by its GP4 end, and send off signal by its GP0 end, turn-off main power source, make television set enter holding state.Then, the pulse signal that the output of the GP5 of single-chip microcomputer N34 end originally received is by the luminous warning of indicator light circuit control light-emitting diode D40.When the indicating status of light-emitting diode D40 during for bright twice of phase weekly, the expression temperature exceeds limited range; When the indicating status of light-emitting diode D40 during for bright three times of phase weekly, the expression fan breaks down; When the indicating status of light-emitting diode D40 during, represent that then system board and ray machine communication break down for bright four times of phase weekly.Reflect the kind that system breaks down very intuitively with this, made things convenient for the guidance technology personnel to carry out troubleshooting.
Meanwhile, described single-chip microcomputer N34 also has watchdog function, and when program was absorbed in endless loop for a certain reason, single-chip microcomputer N34 connected the reset terminal RESET of main MCU through switch MOS pipe CM1 by its GP1 end.Grid connection+3.3V the DC power supply of described metal-oxide-semiconductor CM1, and connect the reset terminal RESET of main MCU through resistance R 35, its drain electrode connects GP1 end of single-chip microcomputer, and source electrode connects the reset terminal RESET of main MCU.Control main MCU and reset when endless loop appears in program, system restarts.In addition, the reset terminal RESET of described main MCU also often opens reset key P1 ground connection, the realization hand-reset through one.
The present invention has finished the effective management of TV set power and the detection and the warning function of most common failure well by adopting above-mentioned simple circuit configuration, has realized the low-power consumption (less than 0.5W) of complete machine.Certainly; above-mentioned explanation is not to be limitation of the present invention; the present invention 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 invention also should belong to protection scope of the present invention.
Claims (10)
1. the fault detect of a television set and warning circuit, comprise main MCU, ray machine and fan, it is characterized in that: two high-low level signal input parts of described main MCU connect the control signal output ends of fan-status testing circuit and temperature sensor respectively, and the system bus end of main MCU links to each other with the bus end of ray machine by iic bus; The control signal output ends of described main MCU connects the signal input end of a single-chip microcomputer, and described single-chip microcomputer connects the switching on and shutting down signal input part and the indicator light circuit of power panel circuit respectively according to the control signal that receives by its different GPIO mouth.
2. the fault detect of television set according to claim 1 and warning circuit is characterized in that: the control signal output ends of described main MCU connects one of them GPIO mouth of single-chip microcomputer, and described GPIO mouth links to each other with indicator light circuit simultaneously.
3. the fault detect of television set according to claim 1 and 2 and warning circuit, it is characterized in that: in described indicator light circuit, include a NPN type triode, the base stage of described triode connects the GPIO mouth of described single-chip microcomputer, collector electrode connects a direct current power supply, emitter connects the positive pole of a light-emitting diode, the minus earth of described light-emitting diode.
4. the fault detect of television set according to claim 1 and 2 and warning circuit, it is characterized in that: in described fan-status testing circuit, the fan state test side connects the control end of a controllable switch element, and the gating end of described controllable switch element is according to high-low level signal input part output high level signal or the low level signal of its on off state to main MCU.
5. the fault detect of television set according to claim 4 and warning circuit, it is characterized in that: described controllable switch element adopts a NPN type triode to realize, the base stage of described triode connects the fan state test side, and connect a direct current power supply by pull-up resistor, the grounded emitter of described triode, collector electrode connects DC power supply through resistance on the one hand, links to each other with the high-low level signal input part of main MCU on the other hand.
6. the fault detect of television set according to claim 5 and warning circuit, it is characterized in that: described temperature sensor adopts a thermal resistance temperature sensor to realize that the control signal output ends of described transducer connects one of them high-low level signal input part of main MCU through resistance.
7. according to the fault detect and the warning circuit of claim 1 or 2 or 6 described television sets, it is characterized in that: the interrupt signal output of described single-chip microcomputer connects the interrupt signal end of main MCU through resistance.
8. the fault detect of television set according to claim 7 and warning circuit is characterized in that: one of them GPIO mouth output reset signal of described single-chip microcomputer connects the reset terminal of main MCU by the switch MOS pipe; The grid of described metal-oxide-semiconductor connects a direct current power supply on the one hand, connects the reset terminal of main MCU on the other hand through a resistance, and its drain electrode connects the GPIO mouth of described single-chip microcomputer, and source electrode connects the reset terminal of main MCU; The reset terminal of described main MCU is also through a normal open switch ground connection.
9. the fault detect of television set according to claim 8 and warning circuit is characterized in that: one of them GPIO mouth of described single-chip microcomputer is through switching on and shutting down button ground connection, and its COUT port connects remote control switch interface.
10. the fault detect of television set according to claim 9 and warning circuit is characterized in that: it is that the integrated chip of PW318 realizes that the model of described single-chip microcomputer is PIC12F629 that described main MCU adopts a model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510131137 CN1825982A (en) | 2005-12-20 | 2005-12-20 | Fault detecting and warning circuit for TV set |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510131137 CN1825982A (en) | 2005-12-20 | 2005-12-20 | Fault detecting and warning circuit for TV set |
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| CN1825982A true CN1825982A (en) | 2006-08-30 |
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| CN 200510131137 Pending CN1825982A (en) | 2005-12-20 | 2005-12-20 | Fault detecting and warning circuit for TV set |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101349726B (en) * | 2007-07-17 | 2010-10-13 | 联芯科技有限公司 | Method and apparatus for malfunction detection of general-purpose input/output interface |
| CN101754048B (en) * | 2008-12-10 | 2012-01-25 | 康佳集团股份有限公司 | Method and device for processing fault of television |
| CN102665095A (en) * | 2012-04-12 | 2012-09-12 | 青岛海信电器股份有限公司 | Method and system for locating random on-off failure of television |
| CN110677642A (en) * | 2019-11-15 | 2020-01-10 | 冠捷显示科技（厦门）有限公司 | Television fault online detection method and device based on LED indicator lamp |
-
2005
- 2005-12-20 CN CN 200510131137 patent/CN1825982A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101349726B (en) * | 2007-07-17 | 2010-10-13 | 联芯科技有限公司 | Method and apparatus for malfunction detection of general-purpose input/output interface |
| CN101754048B (en) * | 2008-12-10 | 2012-01-25 | 康佳集团股份有限公司 | Method and device for processing fault of television |
| CN102665095A (en) * | 2012-04-12 | 2012-09-12 | 青岛海信电器股份有限公司 | Method and system for locating random on-off failure of television |
| CN102665095B (en) * | 2012-04-12 | 2015-03-11 | 青岛海信电器股份有限公司 | Method and system for locating random on-off failure of television |
| CN110677642A (en) * | 2019-11-15 | 2020-01-10 | 冠捷显示科技（厦门）有限公司 | Television fault online detection method and device based on LED indicator lamp |
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Open date: 20060830 |