CN100362859C - TV set protection circuit - Google Patents
TV set protection circuit Download PDFInfo
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- CN100362859C CN100362859C CNB2005100446475A CN200510044647A CN100362859C CN 100362859 C CN100362859 C CN 100362859C CN B2005100446475 A CNB2005100446475 A CN B2005100446475A CN 200510044647 A CN200510044647 A CN 200510044647A CN 100362859 C CN100362859 C CN 100362859C
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Abstract
The present invention discloses a TV set protection circuit. High-voltage circuit sampling, ABL circuit sampling, direct current sampling produced by a horizontal output transformer, field integrated circuit sampling and main power supply over-voltage sampling are converged to one point by adopting a multiplex protection designing concept and using a control circuit, and then the point is connected to a secondary power supply plate; protection actions are executed in the cutting-off mode of a secondary power supply. Therefore, the present invention effectively protects internal components and integrated circuits of a TV set and also extends the service life of the TV set. Additionally, a sound and image squelch circuit is additionally arranged in the TV set protection circuit for carrying out squelch control for the sounds and the images of the TV set when the operation of a horizontal field circuit or stand-by voltage output is abnormal, and accordingly, the overall engine performance of the TV set is effectively improved. The multiplex protection circuit of the present invention has the advantages of simple structure and artful design, and the normal operation of the whole protection circuit can not be affected when one sampling circuit has the fault of open circuit; therefore, the present invention is favorable to improving the stability of overall engine operation.
Description
Technical field
The present invention relates to a kind of improvement of TV set circuit, specifically, relate to a kind of protective circuit that is applied to television set.
Background technology
At present, in existing television set, under the unusual situation of circuit working, damage, generally in TV set circuit, all designed protective circuit in order to prevent components and parts, integrated circuit etc.Usually, the control that TV set protection circuit carried out has two big classes: first line output transformer failure of oscillation mode; It two is dump or power transformer failure of oscillation mode.Protective circuit is generally taken a sample unusually in main power source overcurrent sample, power supply overvoltage sampling, line scanning, field scan is taken a sample unusually and picture tube is taken a sample unusually etc.If above circuit working is unusual, cause sampling voltage to be higher than normal value, the sampled signal of protective circuit will be delivered to executive circuit, make TV enter guard mode by the executive circuit action, thereby avoid the damage of the inner components and parts of television set.In existing tv product, generally all adopt separate design for above-mentioned protective circuit, the method for independent control is realized; this not only can cause the unusual complicated of circuit structure; it is unusual difficult that wiring board is set type, but also can increase production cost, is unfavorable for the market competitiveness of tv product.Therefore, in some tv product, for simplifying circuit structure, reduce cost, only adopt several circuit wherein to be protected usually, there is potential safety hazard in the robustness that this has just reduced protective circuit.What deserves to be mentioned is, in existing TV set protection circuit, generally do not comprise high tension protection circuit.So-called high voltage protective is exactly a kind of restriction to the television picture tube anode high voltage, also is called the X ray protective circuit.If high pressure is too high, not only can damage components and parts, integrated circuit, even damage picture tube, and high pressure to be too high, X-radiation is excessive, and health also is harmful to.Therefore, realize the comprehensive safeguard protection of television set, in television set, set up high tension protection circuit and be very important.
Summary of the invention
The present invention is in order to overcome TV set protection circuit complex structure in the prior art, wiring board composing difficulty; and the deficiency that lacks the protection of television picture tube anode high voltage; a kind of novel TV organizational security protection circuit is provided; adopt the design philosophy of multiple protective; with high voltage protective and the unified design of other circuit protections; with simple circuit configuration, improved the robustness of protective circuit, realized protection health and components and parts purpose of safety.
For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of TV set protection circuit, comprise high-pressure sampling signal output part and high voltage stabilizing module, described high-pressure sampling signal output part links to each other with an end of first divider resistance through diode, the other end of described first divider resistance is through the second divider resistance ground connection, described first divider resistance links to each other with the negative pole of a voltage stabilizing didoe with the tie point of second divider resistance, and the positive pole of described voltage stabilizing didoe connects executive circuit through the XRAYPROT port; The overvoltage protection end of described high voltage stabilizing module connects described high-pressure sampling signal output part through another voltage-stabiliser tube.
As the further qualification to technique scheme, described XRAYPROT port links to each other with the power end of sampled voltage output, horizontal blanking signal output and an output module of the sampled signal output of automatic brightness control circuit, line retrace scanning circuit respectively through control circuit.Wherein, the sampled signal output of described automatic brightness control circuit connects the negative pole of described voltage stabilizing didoe through resistance; The sampled voltage output of described line retrace scanning circuit links to each other with the negative pole of a voltage-stabiliser tube, and the positive pole of described voltage-stabiliser tube links to each other with the positive pole of a switching diode, and the negative pole of described switching diode connects described XRAYPROT port; The power end of described horizontal blanking signal output and output module then respectively is connected the control end of a gate-controlled switch, and gating end one end of described gate-controlled switch connects DC power supply, and the other end connects described XRAYPROT port.
Further qualification again as to technique scheme is connected with a current rectifying and wave filtering circuit between the control end of described horizontal blanking signal output and gate-controlled switch, described gate-controlled switch all adopts a positive-negative-positive triode to realize.
As further qualification again, in described TV set protection circuit, also include a control circuit and a standby voltage sample mute control circuit that a detection signal according to a row testing circuit output carries out video muting to technique scheme.Wherein, the detection signal output of a row testing circuit connects the control end of a switching circuit, gating end one end of described switching circuit connects DC power supply, and the other end connects follow-up sound, image processing circuit, output V_MUTE signal controlling sound, video muting.And in described standby voltage sample mute control circuit, standby voltage sampling signal output is through a storage capacitor ground connection, and the anodal emitter that connects a positive-negative-positive triode on the one hand of described storage capacitor is on the other hand through divider resistance ground connection; The tie point of described divider resistance links to each other with the base stage of positive-negative-positive triode, and the collector electrode of described positive-negative-positive triode connects the control end of described switching circuit.
Compared with prior art; advantage of the present invention and good effect are: the present invention is by adopting the mentality of designing of multiple protective; high-tension circuit is taken a sample; the sampling of auto brightness control ABL (Automatic BrightnessLimit) circuit; by the direct current sampling that line output transformer produced; field integrated circuit sampling and main power source overvoltage sampling meet at a bit by control circuit; receive again on the auxiliary power plate; cut off the action of mode execute protection by auxiliary power; thereby realized effective protection, prolonged the useful life of television set television set inside components and parts and integrated circuit.In addition; in described TV set protection circuit, also have additional sound, video muting circuit; the field circuit work of can being expert at occur when unusual or during standby voltage output abnormality sound and the image to television set carry out squelch control, thereby effectively improved the complete machine performance of television set.Multiple protective circuit of the present invention, simple in structure, design ingeniously, opening circuit appears in one road sample circuit, can not influence whole protecting circuit operate as normal, thus the robustness when helping improving complete machine work.
Description of drawings
Fig. 1 is the control circuit schematic diagram of mesohigh protection of the present invention, ABL circuit protection, the protection of line retrace scanning circuit and H_BLK circuit protection;
Fig. 2 is the control circuit schematic diagram of midfield of the present invention output module protection;
Fig. 3 is the schematic diagram of sound among the present invention, video muting control circuit.
Embodiment
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Among Fig. 1, high pressure sampled signal output is through diode DH17, DH13 and divider resistance RH25, RH24 ground connection, and the tie point of described two divider resistance RH25, RH24 links to each other with the negative pole of a voltage stabilizing didoe DH15, its anodal XRAYPROT port that connects.Under the television set normal operating conditions, behind sampled voltage process diode DH17, the DH13 of high voltage package output, carry out dividing potential drop by divider resistance RH25 and RH24, produce reverse voltage at voltage stabilizing didoe DH15 place, the reverse breakdown voltage of voltage stabilizing didoe DH15 can be set according to the resistance of divider resistance RH25 and RH24.When high pressure output increases; the high-pressure sampling value also can increase, when surpassing certain value (this value is determined by the physical circuit test usually), and voltage stabilizing didoe DH15 reverse-conducting; by the XRAYPROT port guard signal is delivered to executive circuit, make television set enter guard mode by executive circuit.The overvoltage protection end OVP of high voltage stabilizing module H62501P connects the high pressure sampled signal through voltage stabilizing didoe DH14; when high pressure is too high; voltage stabilizing didoe DH14 reverse-conducting; high voltage stabilizing module H62501P enters the overvoltage protection state; high pressure stops output, thereby has realized the effective protection to the television picture tube anode high voltage.
In addition, in described TV set protection circuit also design ABL protective circuit, line retrace scan protection circuit, horizontal blanking signal H_BLK (H_sync Blank) protective circuit and an output module protective circuit are arranged.Wherein, auto brightness control signal ABL connects the negative pole of voltage stabilizing didoe DH15 by resistance R H32, flows through when big when television operations makes ABL speed, and voltage stabilizing didoe DH15 also can enter the reverse-conducting state, and then produces guard signal.The sampled voltage of line retrace scanning circuit also is connected to the XRAYPROT port by resistance R 771, voltage stabilizing didoe D754 and switching diode D753, when line retrace work overvoltage, also can produce the high level guard signal on the XRAYPROT port.Horizontal blanking signal HBLK after the rectifying and wave-filtering network of diode D759, D756 and capacitor C 769 compositions carries out rectifying and wave-filtering, obtains the base stage that a DC level is added in positive-negative-positive triode Q754 by after the resistance R 781.When not having horizontal blanking signal H_BLK output; triode Q754 conducting; DC power supply SW+8V exports the high level guard signals to the XRAYPROT port through voltage stabilizing didoe D755, triode Q754 and resistance R 766, and then the control executive circuit makes television set enter guard mode.
Among Fig. 2, during output module LA7846N operate as normal, positive-negative-positive triode Q604 ends then and there; The power end of output module LA7846N (7 pin) has the resistance R 629 of very big electric current by 0.68R/1W when shorted to earth occurring then and there, may blow resistance R 629.Control triode Q604 conducting this moment ,+28V DC power supply is exported the high level guard signals to the XRAYPROT port through triode Q604, diode D608 and resistance R 632, and then receives on the auxiliary power plate, cuts off the action of mode execute protection by auxiliary power.
In addition, on the main power circuit plate, can also design+B (120V) sampling ,+overvoltage crowbar of 28V power supply sampling, and then connect executive circuit by the XRAYPROT port, realize overvoltage protection to main power source.
On the XRAYPROT port, by design to the sample circuit of various protection points, if one of them or opening circuit appears in several sample circuit, 632 places open circuit such as resistance R among Fig. 2, can't influence complete machine protective circuit operate as normal.The design philosophy of such multiple protective, the robustness when helping complete machine work.
In addition, the present invention also by the detection to row field signal, has designed sound, video muting circuit, as shown in Figure 3.The SPOT signal is the detection signal of row testing circuit output, connects the base stage of NPN type triode Q33 through diode D63, resistance R 298, and the collector electrode of described NPN type triode Q33 is through divider resistance R302, R305 connection+12V DC power supply, grounded emitter.The tie point of described divider resistance R302, R305 links to each other with the base stage of a positive-negative-positive triode Q34, emitter connection+12V the DC power supply of described positive-negative-positive triode Q34, collector electrode connects the base stage of a NPN type triode Q32 on the other hand on the one hand through resistance R 304 ground connection through resistance R 306; Collector electrode connection+12V the DC power supply of described NPN type triode Q32, emitter connects the V_MUTE signal output part through diode D60, resistance R 310.When row field circuit operate as normal, SPOT port output low level, at this moment, triode Q33, Q34, Q32 all end, and do not have the output of V_MUTE mute signal.When row field circuit work occurs when unusual, SPOT port output high level, control triode Q33, Q34, Q32 conducting, and then make+the 12V DC power supply affacts the V_MUTE port by resistance R 308, diode D57, triode Q32, diode D60 and resistance R 310, export high level V_MUTE purified signal, carry out the noise elimination of sound and image by follow-up audio frequency amplification treatment circuit and video amplification treatment circuit.
Ack signal is the sampled signal of right on the auxiliary power plate+5V standby voltage, and after the television set energising, the 220V of transformer prime treats the dynamo-electric SBY+5V of pressure by optocoupler and samples.Sampled voltage enters on the signal plate by the PQS1 interface of socket, and the V_MUTE squelch circuit is controlled.Equally, when the ack signal output low level, promptly stop power supply or the standby voltage power supply occurs when unusual when transformer prime on the auxiliary power plate, electrochemical capacitor C275 discharge makes positive-negative-positive triode Q35 conducting, and then the output high level signal drives described triode Q33, Q34, Q32 conducting, by V_MUTE port output high level purified signal.
In addition, the MUTE mute signal of being exported by the quiet end of central processor MCU is connected the V_MUTE port by diode D61 with resistance R 310, when the television set switching channels, the output high level signal is exported by the V_MUTE port, and then controls sound, video muting.
The field circuit work of being expert at occurs when unusual, can adopt the mode according to a row detection signal control line output transformer failure of oscillation, stops high pressure output, and then reaches the purpose of protective circuit.
The present invention has realized multiple protective to TV set circuit by adopting above-mentioned simple circuit configuration, has guaranteed the fail safe that television set uses.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 (9)
1. TV set protection circuit, comprise high-pressure sampling signal output part and high voltage stabilizing module, it is characterized in that: described high-pressure sampling signal output part links to each other with an end of first divider resistance through diode, the other end of described first divider resistance is through the second divider resistance ground connection, described first divider resistance links to each other with the negative pole of a voltage stabilizing didoe with the tie point of second divider resistance, and the positive pole of described voltage stabilizing didoe connects executive circuit through the XRAYPROT port; The overvoltage protection end of described high voltage stabilizing module connects described high-pressure sampling signal output part through another voltage-stabiliser tube.
2. TV set protection circuit according to claim 1 is characterized in that: described XRAYPROT port links to each other with the power end of sampled voltage output, horizontal blanking signal output and an output module of the sampled signal output of automatic brightness control circuit, line retrace scanning circuit respectively through control circuit.
3. TV set protection circuit according to claim 2 is characterized in that: the sampled signal output of described automatic brightness control circuit connects the negative pole of described voltage stabilizing didoe through resistance.
4. TV set protection circuit according to claim 2; it is characterized in that: the sampled voltage output of described line retrace scanning circuit links to each other with the negative pole of a voltage-stabiliser tube; the positive pole of described voltage-stabiliser tube links to each other with the positive pole of a switching diode (D753), and the negative pole of described switching diode connects described XRAYPROT port.
5. TV set protection circuit according to claim 2; it is characterized in that: described horizontal blanking signal output connects the control end of a gate-controlled switch through a current rectifying and wave filtering circuit; gating end one end of described gate-controlled switch connects DC power supply, and the other end connects described XRAYPROT port.
6. TV set protection circuit according to claim 5; it is characterized in that: described gate-controlled switch adopts a positive-negative-positive triode to realize; the base stage of described positive-negative-positive triode connects the output of described current rectifying and wave filtering circuit; emitter connects DC power supply, and collector electrode connects described XRAYPROT port.
7. TV set protection circuit according to claim 6, it is characterized in that: in described current rectifying and wave filtering circuit, include two diode in series, the positive pole of one of them diode connects described horizontal blanking signal output, negative pole links to each other with the positive pole of another diode, and its negative pole connects the base stage of described positive-negative-positive triode; The tie point of described two diodes is through a filter capacitor ground connection.
8. TV set protection circuit according to claim 2; it is characterized in that: the power end of described output module links to each other with the control end of a gate-controlled switch; gating end one end of described gate-controlled switch connects DC power supply, and the other end connects described XRAYPROT port.
9. TV set protection circuit according to claim 8; it is characterized in that: described gate-controlled switch adopts a positive-negative-positive triode to realize; the base stage of described positive-negative-positive triode connects the power end of described output module, and emitter connects DC power supply, and collector electrode connects described XRAYPROT port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100446475A CN100362859C (en) | 2005-08-31 | 2005-08-31 | TV set protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100446475A CN100362859C (en) | 2005-08-31 | 2005-08-31 | TV set protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN1738393A CN1738393A (en) | 2006-02-22 |
| CN100362859C true CN100362859C (en) | 2008-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100446475A Active CN100362859C (en) | 2005-08-31 | 2005-08-31 | TV set protection circuit |
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| CN (1) | CN100362859C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105025197B (en) * | 2015-07-02 | 2018-06-26 | 宁波摩米创新工场电子科技有限公司 | A kind of intelligent high-definition multi-screen image processing system based on voltage-stabilizing protection |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05316719A (en) * | 1992-05-12 | 1993-11-26 | Hitachi Ltd | High voltage protecting circuit |
| JP2001211345A (en) * | 2000-01-25 | 2001-08-03 | Victor Co Of Japan Ltd | Protecting circuit of image display device |
| CN2482297Y (en) * | 2000-11-06 | 2002-03-13 | 卞祖伟 | Power controller for color TV set |
| CN1564583A (en) * | 2004-03-15 | 2005-01-12 | 四川长虹电器股份有限公司 | Protection circuit of TV |
| CN1571485A (en) * | 2004-04-24 | 2005-01-26 | 张维刚 | Circuit structure improvement scheme for color TV set |
-
2005
- 2005-08-31 CN CNB2005100446475A patent/CN100362859C/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05316719A (en) * | 1992-05-12 | 1993-11-26 | Hitachi Ltd | High voltage protecting circuit |
| JP2001211345A (en) * | 2000-01-25 | 2001-08-03 | Victor Co Of Japan Ltd | Protecting circuit of image display device |
| CN2482297Y (en) * | 2000-11-06 | 2002-03-13 | 卞祖伟 | Power controller for color TV set |
| CN1564583A (en) * | 2004-03-15 | 2005-01-12 | 四川长虹电器股份有限公司 | Protection circuit of TV |
| CN1571485A (en) * | 2004-04-24 | 2005-01-26 | 张维刚 | Circuit structure improvement scheme for color TV set |
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| CN1738393A (en) | 2006-02-22 |
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Address after: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee after: HISENSE Co.,Ltd. Patentee after: Hisense Video Technology Co.,Ltd. Address before: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee before: HISENSE Co.,Ltd. Patentee before: HISENSE ELECTRIC Co.,Ltd. |
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