• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In a video signal processing system, apparatus for limiting excessive peak and average beam currents demanded by a kinescope in response to image representative video signals. A control signal derived by a sensing circuit in response to excessive beam current is applied to the kinescope in a manner to limit excessive beam currents above a threshold level. The sensing circuit includes a capacitor arranged with a conductive diode to form an average responding filter such that the sensing circuit derives a control voltage representative of excessive average beam current in a first beam current limiting mode. In a second beam limiting mode, when beam current exceeds a predetermined level, the diode is rendered nonconductive and the capacitor is decoupled for average detection purposes. In this mode, the control signal is free to vary in accordance with rapid variations in peak beam current.
    公开号:SU1207406A3
    申请号:SU792720498
    申请日:1979-02-08
    公开日:1986-01-23
    发明作者:Генри Виллис Дональд
    申请人:Рка Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    one
    The invention relates to the field of television to limit and can be used in television (TV) receivers to automatically limit the beam current.
    An automatic current limiting device for a color TV receiver beam is known, which contains a kinescope whose anode is connected to a high voltage source, the input of which is connected via a resistor to a primary power source and directly to the inputs of two filters, the first output of which is connected to the control input of the luminance channel, and the output The second filter is connected to the control input of the terminal amplifier unit, the outputs of which are connected to the control inputs of the terminal amplifier unit, the outputs of which are connected to the control inputs lazy kinescope lj.
    However, the known device has low speed and does not work out the rapid changes in the beam current.
    The purpose of the invention is to increase speed.
    The goal is achieved in that an automatic current limiter for a kinescope tube of a color television receiver containing a kinescope, three control inputs of which are connected to the corresponding outputs of a terminal amplifier unit, the control input of which is connected to the output of a luminance channel, and the anode of the kinescope is connected to a high voltage source which, through two series-connected resistors, is connected to the primary power source, and the connection point of the resistors is connected to the source of the reference voltage, as well as to the control input of the control signaling device and through a capacitor to the common power bus, while the output of the control signaling device is connected to the control input of the luminance channel, a series-connected additional capacitor and an additional diode connected parallel to the capacitor, with the point of connection of the additional capacitor and the additional diode
    An additional resistor is connected to the primary power supply.
    The drawing shows a structural electrical circuit.
    5 th limiter current beam kinescope color TV receiver.
    The device contains a block 1 terminal amplifiers, a kinescope 2, a channel 3 of brightness, a driver 4 of the control signal, a source of 5 high voltage, resistors 6 and 7, a capacitor 8, a diode 9, an additional capacitor 10, an additional diode 11, an additional
    t5 resistor 12, primary power supply 13, voltage reference 14.
    The device works as follows.
    20 The luminance signal of the full TV signal is extracted and processed by luminance channel 3, which contains a level fixing unit. Bound luminance signal enters unit 1
    25 terminal amplifiers, where, due to its summation with the color difference signals, signals of primary colors K, 3 and C are formed. These signals are fed to the inputs of a kinescope 2, for example, cathode electrodes for reproducing a color image. High operating voltages for the focusing and accelerating (anode) electrodes of the kinescope 2 (the focusing electrode is not shown) are provided by a source of high voltage voltage 5 from positive horizontal retrace pulses. The primary power source 13 in the form of a positive direct voltage (+27 V) is connected via resistors 6 and 7 to the input of the high voltage source 5. The input current flowing through the resistor 6 includes a component characterizing the change in the current of the anode beam of the kinescope 2 in accordance with the change in the beam current from the luminance and chrominance signals. This current
    50 pulse component with horizontal frequency, which is filtered by capacitor 8.
    Excessive levels of peak and medium beam currents are perceived by the additional capacitor 1Q of relatively large capacity with a normally conducting fixing diode 9 (clamping diode). Normally wire 30
    45
    The additional diode 11 is biased in the forward direction by the current through the additional resistor 12 from the source 13 of the primary power supply (+27 V) and connects the additional capacitor 10 to the common power bus, the beam current does not exceed the level corresponding to the normal operating condition of this kinescope 2.
    The voltage characterizing the input current level, i.e., the anode current, is formed on the additional capacitor 10 and is fed to the input of the driver 4 of the control signal, which forms the control signal in accordance with the magnitude of the excess peak or average beam currents. This control signal is fed to the control input of the 3 luminance channel and reduces the luminance signal, thereby reducing the beam current.
    Under normal operating conditions, the diode 9 fixes the voltage on the capacitor 10 at +11.6 V. The current frequency of the resistor 6 flows through the clamping diode 9, which at this time is conductive, and at the output of the driver 4, the control output there is no signal and the luminance signal passes through the luminance channel 3 without change.
    When the average input current exceeds the first threshold level, the diode 9 rises and the voltage on the additional capacitor 10, not detected by the diode 9 more, decreases with a speed determined by the amount by which the first threshold level of the current exceeds. The former 4 responds to this reduction of the positive voltage through the luminance channel 3 by proportional decrease in the average current of the kinescope beam 2. In this case
    Editor A. Shandor
    Order 8754/61
    Circulation 624 Subscription
    VNIIPN USSR State Committee
    for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5
    Branch PPP Patent, Uzhgorod, st. Project, 4
    ten
    07406.
    If the additional diode 11 remains conductive, the current flows through it to the common power bus, retaining the role of the additional capacitor 10 as a low-pass filter of medium sensitivity.
    The role of the additional capacitor 10 as an average sensitivity filter changes when the kinescope 2 momentarily requires high peak current levels of the beam. This leads to a sharp increase in the input current and the voltage across the additional capacitor 10 decreases.
    Additionally, diode 11 is closed,
    since its forward bias current, provided by the additional resistor 12, now flows through the additional capacitor 10 and is determined by the product of the capacitor capacitance and the rate of change of direction through the capacitor. Thus, for a given capacitance value, the capacitor current increases when the rate of change of the capacitor voltage increases. In this case, the high rate of change of voltage on the additional capacitor 10 is a reaction to a sudden increase in the peak current of the input current value and is essentially independent of the capacitor 8 of the line frequency filter. Due to this, the beam current limiter re-reacts to rapid changes in beam current occurring at a speed exceeding the frequency of the vertical scanning.
    40
    The level of limitation of the current beam spch can be adjusted in each particular case by changing the value of the additional resistor 12.
    Compiled by G.Rosatkevich
    Tehred T.Tulik Proofreader L. Patay
    权利要求:
    Claims (1)
    [1]
    AUTOMATIC KINESCOPE BEAM CURRENT LIMITER OF A COLOR TELEVISION RECEIVER, containing a kinescope ^ three control inputs of which are connected to the corresponding outputs of the terminal amplifier block, the control input of which is connected to the output of the brightness channel, and the anode of the kinescope is connected to a high-voltage voltage source, the input of which is through two series-connected resistor connected to the primary power source, while the connection point of the resistors through according to the included diode is connected to the reference source voltage, as well as with the control input of the driver of the control signal and through the capacitor with a common supply bus, while the output of the driver of the control signal is connected to the control input of the brightness channel, characterized in that, in order to improve performance, series-connected an additional capacitor and an additional diode connected in parallel with the capacitor, moreover, the connection point of the additional capacitor and the additional diode is connected through the introduced additional resistor to the source of primary nutrition.
    类似技术:
    公开号 | 公开日 | 专利标题
    SU1207406A3|1986-01-23|Automatic limiter of current of colour televison set kinescope beam
    US4451849A|1984-05-29|Plural operating mode ambient light responsive television picture control
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    KR930002603B1|1993-04-03|White balance correction circuit
    US4369466A|1983-01-18|Video signal processing circuit
    US4814861A|1989-03-21|Signal processing apparatus with independent gain control for chrominance and color signals
    KR910006491B1|1991-08-26|Bias control system of automatic kinescope
    CA1216668A|1987-01-13|Automatic kinescope beam current limiter
    GB1586092A|1981-03-18|Brightness control apparatus
    SE457312B|1988-12-12|RADIO FRAME CONTROL CIRCUIT FOR A VIDEO SIGNAL PROCESSING CHANNEL INCLUDING AN IMAGE PRESENTATION BODY
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    US5177413A|1993-01-05|Arrangement for generating a beam current indicative signal
    GB1410966A|1975-10-22|Beam current control systems for picutre tubes
    US4207591A|1980-06-10|Gated automatic beam current limiter in a video signal processing system
    FI73559C|1987-10-09|Interrupt compensated automatic beam current limiter for an image tube.
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    US4079424A|1978-03-14|Automatic transient beam current limiter
    US3763316A|1973-10-02|Dynamic focusing circuits for cathode ray tubes
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    KR960015780B1|1996-11-21|A circuit for stabilizing automatic gain adjusting detecter invideo tape cassette
    EP0217443B1|1991-01-23|Picture signal processing circuit
    同族专利:
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    DE2905005C2|1982-06-09|
    NL7901015A|1979-08-13|
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    GB2014409A|1979-08-22|
    FI790353A|1979-08-10|
    FI67005B|1984-08-31|
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    FR2417225A1|1979-09-07|
    IT1111785B|1986-01-13|
    AU4393879A|1979-08-16|
    ATA78579A|1986-08-15|
    DD141964A5|1980-05-28|
    BE873948A|1979-05-29|
    DK52379A|1979-08-10|
    CS252803B2|1987-10-15|
    IT7919866D0|1979-02-02|
    NZ189587A|1982-12-07|
    JPS54116832A|1979-09-11|
    SE438765B|1985-04-29|
    AT382747B|1987-04-10|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE1462900A1|1966-12-09|1968-12-19|Philips Patentverwaltung|Circuit arrangement for limiting the beam current of an electron beam tube|
    US3914545A|1972-08-02|1975-10-21|Zenith Radio Corp|Automatic contrast control utilizing three control signals|
    JPS5230821Y2|1973-02-28|1977-07-14|
    US3848945A|1973-03-16|1974-11-19|Warwick Electronics Inc|Brightness limiting circuit|
    US3842201A|1973-04-09|1974-10-15|Gen Electric|Beam current limiter|
    NL179329C|1974-09-09|1986-08-18|Philips Nv|TELEVISION RECEIVER WITH A BUNDLE POWER LIMIT circuit.|
    JPS59843Y2|1975-10-20|1984-01-11|
    US4067048A|1976-08-19|1978-01-03|Rca Corporation|Automatic beam current limiter|
    US4079424A|1977-02-07|1978-03-14|Rca Corporation|Automatic transient beam current limiter|US4253121A|1978-10-12|1981-02-24|Rca Corporation|Plural sequential operating mode automatic kinescope beam current limiter|
    US4209808A|1979-03-26|1980-06-24|Rca Corporation|Stabilized automatic brightness control network in a video signal processing system including an automatic kinescope beam current limiter|
    US4321513A|1980-09-08|1982-03-23|Rca Corporation|Television receiver high voltage protection circuit|
    US4451849A|1982-06-23|1984-05-29|Rca Corporation|Plural operating mode ambient light responsive television picture control|
    US4516152A|1983-05-23|1985-05-07|Rca Corporation|Video signal processor with automatic kinescope white balance and beam current limiter control systems|
    US4549217A|1983-09-30|1985-10-22|Rca Corporation|Automatic contrast reduction circuit for a teletext or monitor operation|
    US4549218A|1983-09-30|1985-10-22|Rca Corporation|On-screen display|
    US4599643A|1983-12-29|1986-07-08|Rca Corporation|Apparatus responsive to plural color video signals for amplitude limiting the video signals to assist beam current limiting|
    US4554578A|1984-03-02|1985-11-19|Rca Corporation|Error compensated control system in a video signal processor|
    US4633320A|1984-03-08|1986-12-30|Rca Corporation|Video signal processor with automatic kinescope beam current limiter|
    US4562479A|1984-04-26|1985-12-31|Rca Corporation|Automatic kinescope beam current limiter|
    US4689668A|1986-07-14|1987-08-25|Rca Corporation|Auxiliary kinescope beam current limiter with plural cascaded low pass filter and peak detector stages|
    US4901156A|1986-12-26|1990-02-13|Goldstart Co., Ltd.|Automatic brightness limiting circuit|
    US5068730A|1989-04-20|1991-11-26|Thomson Consumer Electronics, Inc.|Video control circuit|
    US5313294A|1990-03-20|1994-05-17|Rca Thomson Licensing Corporation|Beam current limiting arrangement having a peak amplitude, responsive threshold|
    GB9006250D0|1990-03-20|1990-05-16|Rca Licensing Corp|Non-linear beam current limiter|
    US5847773A|1991-08-30|1998-12-08|Thomson Consumer Electronics, Inc.|Video system including apparatus for deactivating an automatic control arrangement|
    US5200829A|1991-12-16|1993-04-06|Thomson Consumer Electronics, Inc.|Contrast beam current limiting arrangement with secondary brightness beam current limiting provisions|
    US5177413A|1992-02-25|1993-01-05|Thomson Consumer Electronics, Inc.|Arrangement for generating a beam current indicative signal|
    KR100214634B1|1996-12-21|1999-08-02|구자홍|B-color gamma correction circuit for projection tv|
    US6563495B1|1998-12-21|2003-05-13|Thomson Licensing S.A.|Automatic screen saver|
    US6483557B1|1999-11-05|2002-11-19|Thomson Licensing Sa|Emission control in a video display|
    US6329770B1|1999-11-05|2001-12-11|Thomson Licensing S.A.|Control of emission in a video display|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US05/876,238|US4167025A|1978-02-09|1978-02-09|Automatic peak beam current limiter|
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