CN2340133Y - Geomagnetism compensating device for colour television set - Google Patents

Geomagnetism compensating device for colour television set Download PDF

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Publication number
CN2340133Y
CN2340133Y CN 98228233 CN98228233U CN2340133Y CN 2340133 Y CN2340133 Y CN 2340133Y CN 98228233 CN98228233 CN 98228233 CN 98228233 U CN98228233 U CN 98228233U CN 2340133 Y CN2340133 Y CN 2340133Y
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China
Prior art keywords
control signal
circuit
resistance
voltage
signal
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Expired - Fee Related
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CN 98228233
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Chinese (zh)
Inventor
毛奎章
梁伯科
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CHANGHONG ELECTRONIC GROUP CORP SICHUAN
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CHANGHONG ELECTRONIC GROUP CORP SICHUAN
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Priority to CN 98228233 priority Critical patent/CN2340133Y/en
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Abstract

The utility model relates to a magnetic field compensating device for a television, which mainly aims at the compensation of a geomagnetic field. The utility model has the working principle that a control signal is taken from a CPU of the television, and the control signal is added to a geomagnetic compensating coil on a picture tube after the filtering and magnifying process of the control signal is finished; thus, a compensating magnetic field can be generated, and the image distortion of the television, which is caused by the geomagnetic field, etc., can be eliminated. The utility model is the magnetic field compensating device which can carry out remote control operation.

Description

Color television set magnetic compensation device
What the utility model was related is the used magnetic compensation device of color television set, is particularly useful for the magnetic compensation of large-screen color TV.
At present, the used deflection way of color television set screen display is magnetic deflection.Promptly in deflecting coil, add deflection current, form scanning magnetic field.Electron gun institute electrons emitted scans under the effect of scanning magnetic field, forms image.Because the existence in television set peripheral outer magnetic field, as the earth magnetic field etc., it will inevitably influence scanning magnetic field, causes image fault, and it shows as image and tilts to some extent, and this phenomenon shows particularly outstanding on large-screen color TV.Chinese patent ZL88101661 has announced a kind of technical scheme of head it off, promptly increases the compensation deflecting coil and offsets external magnetic field.But the shortcoming of this scheme is: its offset current comes from transformer, not only hardware cost is higher, volume is bigger, main is, and to regulate the size of offset current and direction be that potentiometer in the moving adjusting machine of armrest is realized, the user uses very inconvenient, and potentiometer is regulated phenomenons such as being prone to loose contact.
The purpose of this utility model provides a kind of colour TV compensation of geomagnetic field device of remote-controlled operation.
In order to realize the purpose of this utility model, taked following technical scheme.
The magnetic compensation device of the utility model used as television comprises:
The control signal circuit is used for the pulse-modulated signal of central processing unit CPU output is processed into control signal output generation dc control signal voltage, and it is connected with level shifting circuit;
Reference voltage circuit is used for output and produces benchmark dc control signal voltage, and it is connected with level shifting circuit;
Level shifting circuit, the dc control signal voltage, the benchmark dc control signal voltage transitions that are used for control signal circuit, reference voltage circuit are transported respectively become dc control signal, and it is connected with control signal circuit, reference voltage circuit, current amplifier circuit respectively;
Current amplifier circuit is used for the dc control signal of level shifting circuit conversion output is amplified, proofreaies and correct, removes noise jamming; Itself and level shifting circuit, magnetic compensation coil L 1Be connected;
Magnetic compensation coil L 1, be used to produce the compensating field and act on picture tube; It is connected with current amplifier circuit, places on the picture tube neck;
Its control signal is to transmit like this: from the pulse-modulated signal of central control unit CPU output, after the control signal processing of circuit, form control signal voltage, give level shifting circuit respectively with the reference voltage that reference voltage circuit produces, controlled signal after changing, give current amplifier circuit and amplify, proofread and correct, remove the noise jamming processing, the control signal after the processing and amplifying is sent into magnetic compensation coil L 1, produce the compensating field and act on picture tube.
Operation principle of the present utility model is performed such: the pulse width modulating signal of exporting from the central processing unit CPU of television set forms direct-current control voltage and delivers to level shifting circuit behind integration, through the signal after the level conversion with flow to current amplifier circuit after reference voltage is compared and amplify the formation compensating signal, the compensating signal after the amplification is sent into bucking coil.
The control signal circuit is pulse width modulating signal output pin and the resistance R from CPU 1, capacitor C 1The integrating circuit of forming; Capacitor C 1Anode through resistance R 2Connecting resistance R 3An end, resistance R 3Another termination+12V power supply; Resistance R 2With resistance R 3Tie point also receive the inverting input of operational amplifier; The reference voltage that is connected to the operational amplifier positive input by+12V power positive end through resistance R 4, capacitor C 2, voltage stabilizing didoe D 1Produce.
Operational amplifier IC 2And peripheral components constitutes level shifting circuit, it is converted to the dc control signal of 0～5V that aforesaid control circuit comes-16V～+ dc control signal of 16V.Operational amplifier IC 2The compensating signal of output+16V～0 is section through resistance R 5By triode V 1Carry out electric current and amplify, 0～-the 16V section is through resistance R 5By triode V 2Carry out electric current and amplify, the signal after the amplification is at triode V 1, triode V 2Emitter be focused at and form magnetic compensation coil L together 1Drive signal, through resistance R 9, magnetic compensation coil L 1, resistance R 13, resistance R 7, triode V 1Or resistance R 8, triode V 2Constitute the loop.Because the magnetic compensation signal comes from the pulse width modulating signal of CPU output.Therefore, the user can regulate compensation with remote controller according to the earth magnetism situation in own residing area, thereby eliminates the influence that bring in the earth magnetic field.Below in conjunction with drawings and Examples the utility model is described in further detail.
Fig. 1 is the utility model color television set with magnetic compensation device embodiment 1 for the utility model color television set with magnetic compensation device circuit figure Fig. 2
IC 1For the used CPU of complete machine (being called for short CPU), send a pulse width modulating signal (abbreviation pwm signal) by it, then by the integrating circuit resistance R 1, capacitor C 1Form direct-current control voltage behind the integral filtering, its amplitude is 0～5V, and this direct-current control voltage is used for controlling the intensity and the direction of the compensating field that the magnetic compensation coil produced.
Operational amplifier IC 2Be an operational amplifier, its in-phase input end is by resistance R 4, capacitor C 2, voltage stabilizing didoe D 1The reference voltage of 1 5.1V is provided; Its inverting input is by resistance R 3One direct current operating voltage is set, and when aforementioned direct-current control voltage is its mid point (when being 2.5V), the direct-current working volts of inverting input correspond to 5.1V.At this moment, operational amplifier IC 2The voltage of output be zero, operational amplifier IC 2Operating voltage be+16V and-16V, operational amplifier IC 2And peripheral formation level shifting circuit.
Corresponding to 0～2.5V section of dc control signal voltage, the output of operational amplifier IC2 is+16V～0, corresponding to the 2.5V～5V section of dc control signal voltage, the output voltage of operational amplifier IC2 is 0～-16V, that is to say operational amplifier IC 2Direct-current control voltage 0～5V section that CPU is sent is converted to+16～-control level of 16V.Wherein+16V～0 is section through resistance R 5By triode V 1Carry out electric current and amplify, 0～-the 16V section is through resistance R 5By triode V 2Carry out electric current and amplify, the signal after the amplification is at triode V 1, triode V 2Emitter can form magnetic compensation coil L together 1Drive signal, through resistance R 9, magnetic compensation coil L 1, resistance R 13, resistance R 7, triode V 1Or resistance R 8, triode V 2Constitute the loop, carry out magnetic compensation and proofread and correct.
Can change the size of the pwm signal of CPU output by the some buttons on the remote controller, thereby regulate the size and Orientation of the compensating field that bucking coil produced.Because magnetic compensation coil L 1Directly be loaded on the picture tube, can be coupled at its two ends row, field scan signal increase resistance R 10, capacitor C 4Network suppresses.From resistance R 13The signal that takes out of an end through resistance R 12, capacitor C 5Constitute and exchange negative feedback, the AC signal multiplication factor of may command whole system, resistance R 11Constitute the direct current negative feedback, but the multiplication factor of the dc point of stabilizing amplifier and direct current signal.Capacitor C 3Cross-over connection is in the output and the anti-phase input two ends of operational amplifier, and high-frequency harmonic is had the effect of inhibition, can prevent that operational amplifier from producing self-excitation.Simultaneously, comprise the alternating current-direct current negative feedback in the circuit, make system more stable; Resistance R 10, capacitor C 4Form network, can eliminate magnetic compensation coil L 1Clutter from the CRT coupling.
Example I C 1Be Philip PCA84C640 or the M54036 of Mitsubishi.Operational amplifier IC 2TA75548 of Toshiba or Philip LM358, voltage stabilizing didoe D 1Be the voltage stabilizing didoe of 5.1V, triode V 1For operating current is not less than the NPN type triode that 100mA, operating voltage are not less than 25V, triode V 2For operating current is not less than the positive-negative-positive three plate pipes that 100mA, operating voltage are not less than 25V.The used magnetic compensation device coil L of the utility model 1Parameter, inductance: 60-120mH, internal resistance: 150～300 Ω, the number of turn: 300～600.
The scope of the driving voltage of present embodiment output is-16V～+ 16V, the scope of drive current is-50mA～+ 50mA.
The required operating voltage of the utility model+12V and+16V all can+8V～+ regulate in the scope of 24V ,-16V voltage also can-8V～-regulate in the scope of 24V, only need to adjust resistance R 3, resistance R 4, resistance R 7, resistance R 8Value Deng device gets final product.When voltage＜8V, circuit is difficult to operate as normal, and when＞24V, corresponding components and parts will redesign, and cost improves, against the purpose of this utility model.Coil is circular, and diameter is 150～300mm.
Add colour TV of the present utility model, adjustable range size ± 10 of the horizontal tilt degree of image ° in the screen, this just is enough to compensate the influence of earth magnetic field, different regions to colour TV.
For the TV of different model, employed picture tube is also inequality, only needs to adjust magnetic compensation coil L 1, resistance R 7, resistance R 8Deng parameter just can make it to adapt to, and can guarantee it ± 10 ° adjusting range.

Claims (5)

  1. The magnetic compensation device of 1 one kinds of used as television is characterized in that comprising:
    The control signal circuit is used for the pulse-modulated signal of central processing unit CPU output is processed into control signal output generation dc control signal voltage, and it is connected with level shifting circuit;
    Reference voltage circuit is used for output and produces benchmark dc control signal voltage, and it is connected with level shifting circuit;
    Level shifting circuit, the dc control signal voltage, the benchmark dc control signal voltage transitions that are used for control signal circuit, reference voltage circuit are transported respectively become dc control signal, and it is connected with control signal circuit, reference voltage circuit, current amplifier circuit respectively;
    Current amplifier circuit is used for the dc control signal of level shifting circuit conversion output is amplified, proofreaies and correct, removes noise jamming; Itself and level shifting circuit, magnetic compensation coil L 1Be connected;
    Magnetic compensation coil L 1, be used to produce the compensating field and act on picture tube; It is connected with current amplifier circuit, places on the picture tube neck;
    Its control signal is to transmit like this: from the pulse-modulated signal of central control unit CPU output, after the control signal processing of circuit, form control signal voltage, give level shifting circuit respectively with the reference voltage that reference voltage circuit produces, controlled signal after changing, give current amplifier circuit and amplify, proofread and correct, remove the noise jamming processing, the control signal after the processing and amplifying is sent into magnetic compensation coil L 1, produce the compensating field and act on picture tube.
  2. 2 devices according to claim 1 is characterized in that the control signal circuit comprises
    The pulse width modulating signal output pin of central processing unit CPU is to resistance R 1, capacitor C 1The integrating circuit of forming; Capacitor C 1Anode connect resistance R respectively 2And resistance R 1, resistance R 2Connect resistance R respectively 3An end, operational amplifier IC 2Reverse input end, resistance R 3The other end receive+12V.
  3. 3 according to claims 1 described device, and it is characterized in that: its level shifting circuit comprises: operational amplifier IC 2Negative pole end respectively with the resistance R of control signal circuit 3, resistance R 2And capacitor C 3An end be connected; Operational amplifier IC 2Positive terminal respectively with the voltage stabilizing didoe D of reference voltage circuit 1, resistance R 4, capacitor C 2An end be connected; Capacitor C 3The other end and operational amplifier IC 2Output be connected; The dc control signal of 0～5V that it will come from aforementioned control signal circuit is converted to-16V～+ dc control signal of 16V, and deliver to current amplifier circuit.
  4. 4 according to claims 1 described device, and it is characterized in that: its current amplifier circuit comprises
    Operational amplifier IC 2The compensating signal of output+16V～0 is section through resistance R 5By triode V 1Carry out electric current and amplify, 0～-the 16V section is through resistance R 5By triode V 2Carry out electric current and amplify, the signal after the amplification is at three plate pipe V 1, triode V 2Emitter can form magnetic compensation coil L together 1Drive signal, through resistance R 9, magnetic compensation coil L 1, resistance R 13, resistance R 7, triode V 1Or resistance R 8, triode V 2Constitute the loop.
  5. 5 according to claims 1 described device, and it is characterized in that: its reference voltage circuit comprises
    Be connected to operational amplifier IC 2The reference voltage of positive input by+12V through resistance R 4, capacitor C 2, voltage stabilizing didoe D 1The back produces.
CN 98228233 1998-01-26 1998-01-26 Geomagnetism compensating device for colour television set Expired - Fee Related CN2340133Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 98228233 CN2340133Y (en) 1998-01-26 1998-01-26 Geomagnetism compensating device for colour television set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 98228233 CN2340133Y (en) 1998-01-26 1998-01-26 Geomagnetism compensating device for colour television set

Publications (1)

Publication Number Publication Date
CN2340133Y true CN2340133Y (en) 1999-09-22

Family

ID=33978398

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 98228233 Expired - Fee Related CN2340133Y (en) 1998-01-26 1998-01-26 Geomagnetism compensating device for colour television set

Country Status (1)

Country Link
CN (1) CN2340133Y (en)

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