CN101420632B - Method, system and apparatus for detecting degaussing in television set - Google Patents
Method, system and apparatus for detecting degaussing in television set Download PDFInfo
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- CN101420632B CN101420632B CN2008102173832A CN200810217383A CN101420632B CN 101420632 B CN101420632 B CN 101420632B CN 2008102173832 A CN2008102173832 A CN 2008102173832A CN 200810217383 A CN200810217383 A CN 200810217383A CN 101420632 B CN101420632 B CN 101420632B
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Abstract
The invention is applicable to the detection filed, and provides a method for detecting degaussing in a TV, a system and a device thereof. The device comprises a degaussing signal acquisition and processing unit, a supply current signal acquisition and processing unit and a controller. The controller comprises a supply current signal processing module, a degaussing signal processing module and a detection result generation module. In the embodiment of the invention, a degaussing starting time is determined by detection of a supply current signal, a pre-degaussing voltage, an initial degaussing voltage, and a post-degaussing voltage are obtained from a detected degaussing signal, voltage fluctuation range of the degaussing signal is calculated, and the degaussing circuit is judged to be normal or not. The detection method is accurate and avoids misjudgment caused by taking an interference magnetic field signal as the degaussing signal for detection.
Description
Technical field
The invention belongs to detection range, relate in particular to a kind of method, system and device that detect degaussing in television set.
Background technology
Television set is being started shooting moment, inner anti-magnetized coil can produce the erasing field of short time, whether normal in order to detect degaussing circuit, now developed a kind of method and apparatus that is used for the sense colors degaussing in television set, this device comprises the magnetic test coil of collecting erase signal, waveform sampling treatment circuit and signal processing circuit, waveform sampling treatment circuit sampling erase signal also is input to signal processing circuit with this signal, this signal processing circuit provides a hysteresis voltage, and whether the difference by relatively should sampling erase signal maximum and minimum voltage value greater than this hysteresis voltage, thereby judges whether this degaussing circuit is normal.
But there is shortcoming in this scheme, because the disturbing magnetic field more complicated of television set production line, this scheme in the face of the stronger magnetic interference environment of television set production line the time, easily the disturbing magnetic field signal as erase signal, be easy to generate erroneous judgement like this, influence testing result.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of method that detects degaussing in television set, is intended to solve prior art and has the field signal influence that is interfered when detecting degaussing in television set, is easy to generate the problem of erroneous judgement.
The embodiment of the invention is achieved in that a kind of method that detects degaussing in television set, and described method comprises the steps:
Receive the source current waveform signal, whether the source current waveform signal of reception three trailing edges of continued presence, if exist, determine the time point that demagnetization begins;
Continue to receive digital erase signal, obtain demagnetization and begin voltage;
Continue to receive digital erase signal, obtain voltage after the demagnetization;
Begin voltage after voltage and the demagnetization according to voltage, demagnetization before the demagnetization, calculate the difference that demagnetization begins voltage and the preceding voltage of demagnetization, and calculate the difference that demagnetization begins voltage after voltage and the demagnetization, described two differences are compared with threshold value respectively, whether described two differences greater than threshold value, if greater than, draw and detect qualified result, if less than, draw and detect defective result.
Another purpose of the embodiment of the invention is to provide a kind of system that detects degaussing in television set, and described system comprises:
The power current signal processing module is used to receive the source current waveform signal, and whether the source current waveform signal of reception three trailing edges of continued presence, if exist, determines the time point that demagnetization begins;
The erase signal processing module is used to receive digital erase signal, obtains voltage before the demagnetization, determine time point that demagnetization begins after, continue to receive digital erase signal, obtain demagnetization and begin voltage, continue to receive digital erase signal, obtain voltage after the demagnetization; And
The testing result generation module, be used for beginning voltage after voltage and the demagnetization according to voltage, demagnetization before the demagnetization, calculate the difference that demagnetization begins voltage and the preceding voltage of demagnetization, and calculate the difference that demagnetization begins voltage after voltage and the demagnetization, and described two differences are compared with threshold value respectively, whether described two differences are greater than threshold value, if greater than, draw and detect qualified result, if less than, draw and detect defective result.
Another purpose of the embodiment of the invention is to provide a kind of device that detects degaussing in television set, and described device comprises the system of above-mentioned detection degaussing in television set.
In embodiments of the present invention, by detecting power current signal, determine the time point that demagnetization begins, and from the erase signal that detects, obtain voltage before the demagnetization, demagnetization and begin voltage after voltage and the demagnetization, whether calculate the voltage fluctuation amplitude of erase signal, it is normal to differentiate degaussing circuit, and this detection method is accurate, avoid a disturbing magnetic field signal to detect as erase signal, and the erroneous judgement that causes.
Fig. 1 is the flow chart of the method for the detection degaussing in television set that provides of the embodiment of the invention;
Fig. 2 is the structure chart of the device of the detection degaussing in television set that provides of the embodiment of the invention;
Fig. 3 is the structure chart of the system of the detection degaussing in television set that provides of the embodiment of the invention;
Fig. 4 is the exemplary circuit figure of the device of the detection degaussing in television set that provides of the embodiment of the invention.
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated. Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 shows the realization flow of the method for the detection degaussing in television set that the embodiment of the invention provides, and details are as follows:
In step S101, receive digital erase signal, obtain the front voltage of demagnetization;
Description of drawings
In step S102, receive the source current waveform signal, determine the time point that demagnetization begins;
Receive the source current waveform signal, whether the source current waveform signal of reception three trailing edges of continued presence, if exist, determine the time point that demagnetization begins.
In step S103, continue to receive digital erase signal, obtain demagnetization and begin voltage;
In step S104, continue to receive digital erase signal, obtain voltage after the demagnetization;
Embodiment
In step S105, begin voltage after voltage and the demagnetization according to voltage, demagnetization before the demagnetization, calculate the voltage fluctuation amplitude of erase signal, draw testing result;
Calculate the difference that demagnetization begins voltage and the preceding voltage of demagnetization, and calculate the difference that demagnetization begins voltage after voltage and the demagnetization, described two differences are compared with threshold value respectively, whether described two differences are greater than threshold value, if greater than, draw and detect qualified result, if less than, draw and detect defective result.
In step S106, the output testing result.
Fig. 2 shows the structure of the device of the detection degaussing in television set that the embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention.
The device that detects degaussing in television set comprises erase signal acquisition process unit 100, power current signal acquisition process unit 200 and the controller 300 that is connected with the output of erase signal acquisition process unit 100 and power current signal acquisition process unit 200.
Erase signal acquisition process unit 100 is used for erase signal is gathered, handled, and convert digital erase signal to, it comprises magnetic test coil 101, amplifying circuit 102, detecting circuit 103 and the A/D change-over circuit 104 that links to each other successively, power current signal acquisition process unit 200 is used for power current signal is gathered, handled, and converting the source current waveform signal to, it comprises sample circuit 201, rectification circuit 202 and the comparator 203 that links to each other successively.
Power current signal processing module 301 receives the source current waveform signal that power current signal acquisition process unit 200 sends, determine the time point that demagnetization begins, certainly, power current signal processing module 301 also can receive the source current waveform signal that other unit sends, and is not that only qualification is the source current waveform signal that is sent by power current signal acquisition process unit 200; Erase signal processing module 302 receives the digital erase signal that erase signal acquisition process unit 100 sends, the time point that begins according to demagnetization, obtain voltage before the demagnetization, demagnetization and begin voltage after voltage and the demagnetization, certainly, erase signal processing module 302 also can receive the digital erase signal that other unit sends, and is not that only qualification is the digital erase signal that is sent by erase signal acquisition process unit 100; Testing result generation module 303 begins voltage after voltage and the demagnetization according to voltage, demagnetization before the demagnetization, calculates the voltage fluctuation amplitude of erase signal, draws testing result.
As one embodiment of the invention, the device that detects degaussing in television set also comprises testing result reminding module 400, and this testing result reminding module 400 can adopt indicator light or buzzer, to the user prompt testing result.
Fig. 4 shows the exemplary circuit structure of the device of the detection degaussing in television set that the embodiment of the invention provides.
CN2 is a power input socket, CN3 is a power output socket, export to the TV set power plug, sample resistance R27 constitutes sample circuit 201, rectification circuit 202 is by the first diode D7, the second diode D8, the 3rd diode D9 and the 4th diode D10 form, after sampled circuit 201 samplings of power current signal, through rectification circuit 202 rectifications, pass through comparator 203 again, be converted into the source current waveform signal at last, be sent to the input P3.2 of single-chip microcomputer U2 then, single-chip microcomputer U2 is according to the source current waveform signal, determine the time point that demagnetization begins, and the time point that begins of the digital erase signal that sends according to erase signal acquisition process unit 100 and demagnetization, obtain voltage before the demagnetization, demagnetization begins voltage after voltage and the demagnetization, calculates the voltage fluctuation amplitude of erase signal, draw testing result, this testing result is exported to indicator light D12 by output P1.2 respectively, and P1.4 exports to buzzer by output, to the user prompt testing result.
In embodiments of the present invention, by detecting power current signal, determine the time point that demagnetization begins, and from the erase signal that detects, obtain voltage before the demagnetization, demagnetization and begin voltage after voltage and the demagnetization, whether calculate the voltage fluctuation amplitude of erase signal, it is normal to differentiate degaussing circuit, and this detection method is accurate, avoid a disturbing magnetic field signal to detect as erase signal, and the erroneous judgement that causes.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, described program can be in being stored in a computer read/write memory medium, described storage medium is as ROM/RAM, disk, CD etc.
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.
Claims (4)
1. a method that detects degaussing in television set is characterized in that, described method comprises the steps:
Receive digital erase signal, obtain the preceding voltage of demagnetization;
Receive the source current waveform signal, whether the source current waveform signal of reception three trailing edges of continued presence, if exist, determine the time point that demagnetization begins;
Continue to receive digital erase signal, obtain demagnetization and begin voltage;
Continue to receive digital erase signal, obtain voltage after the demagnetization;
Begin voltage after voltage and the demagnetization according to voltage, demagnetization before the demagnetization, calculate the difference that demagnetization begins voltage and the preceding voltage of demagnetization, and calculate the difference that demagnetization begins voltage after voltage and the demagnetization, described two differences are compared with threshold value respectively, whether described two differences greater than threshold value, if greater than, draw and detect qualified result, if less than, draw and detect defective result.
2. the method for claim 1, it is characterized in that, describedly begin voltage after voltage and the demagnetization, calculate the difference that demagnetization begins voltage before voltage and the demagnetization, and the calculating demagnetization begins the difference of voltage after voltage and the demagnetization according to voltage, demagnetization before the demagnetization, described two differences are compared with threshold value respectively, whether described two differences greater than threshold value, if greater than, draw and detect qualified result, if less than, draw the step that detects defective result and also comprise the steps: afterwards
The output testing result.
3. a system that detects degaussing in television set is characterized in that, described system comprises:
The power current signal processing module is used to receive the source current waveform signal, and whether the source current waveform signal of reception three trailing edges of continued presence, if exist, determines the time point that demagnetization begins;
The erase signal processing module is used to receive digital erase signal, obtains voltage before the demagnetization, determine time point that demagnetization begins after, continue to receive digital erase signal, obtain demagnetization and begin voltage, continue to receive digital erase signal, obtain voltage after the demagnetization; And
The testing result generation module, be used for beginning voltage after voltage and the demagnetization according to voltage, demagnetization before the demagnetization, calculate the difference that demagnetization begins voltage and the preceding voltage of demagnetization, and calculate the difference that demagnetization begins voltage after voltage and the demagnetization, and described two differences are compared with threshold value respectively, whether described two differences are greater than threshold value, if greater than, draw and detect qualified result, if less than, draw and detect defective result.
4. a device that detects degaussing in television set is characterized in that, described device comprises the system of detection degaussing in television set as claimed in claim 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102173832A CN101420632B (en) | 2008-11-19 | 2008-11-19 | Method, system and apparatus for detecting degaussing in television set |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008102173832A CN101420632B (en) | 2008-11-19 | 2008-11-19 | Method, system and apparatus for detecting degaussing in television set |
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| Publication Number | Publication Date |
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| CN101420632A CN101420632A (en) | 2009-04-29 |
| CN101420632B true CN101420632B (en) | 2010-09-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111816403B (en) * | 2020-07-09 | 2021-02-19 | 北京中超伟业信息安全技术股份有限公司 | Target position determining method and system for demagnetization |
| CN116484788B (en) * | 2023-04-26 | 2023-11-14 | 北京航空航天大学 | Modeling method and system for demagnetizing process of magnetic shielding device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998059499A1 (en) * | 1997-06-25 | 1998-12-30 | Koninklijke Philips Electronics N.V. | Degaussing |
| CN1221294A (en) * | 1997-12-19 | 1999-06-30 | 株式会社村田制作所 | Degaussing circuit |
| CN1625270A (en) * | 2003-12-03 | 2005-06-08 | 深圳创维－Rgb电子有限公司 | Method and device for detecting demagnetization in color TV. set |
| CN101110893A (en) * | 2006-07-20 | 2008-01-23 | 深圳Tcl新技术有限公司 | Television set degaussing circuit |
-
2008
- 2008-11-19 CN CN2008102173832A patent/CN101420632B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998059499A1 (en) * | 1997-06-25 | 1998-12-30 | Koninklijke Philips Electronics N.V. | Degaussing |
| CN1221294A (en) * | 1997-12-19 | 1999-06-30 | 株式会社村田制作所 | Degaussing circuit |
| CN1625270A (en) * | 2003-12-03 | 2005-06-08 | 深圳创维－Rgb电子有限公司 | Method and device for detecting demagnetization in color TV. set |
| CN101110893A (en) * | 2006-07-20 | 2008-01-23 | 深圳Tcl新技术有限公司 | Television set degaussing circuit |
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Granted publication date: 20100908 Termination date: 20111119 |