US3846666A - High voltage circuit of color television receiver - Google Patents

High voltage circuit of color television receiver Download PDF

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Publication number
US3846666A
US3846666A US00329867A US32986773A US3846666A US 3846666 A US3846666 A US 3846666A US 00329867 A US00329867 A US 00329867A US 32986773 A US32986773 A US 32986773A US 3846666 A US3846666 A US 3846666A
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Prior art keywords
voltage
stage
output
shadow mask
rectifier
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Expired - Lifetime
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US00329867A
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English (en)
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N Suzuki
T Nishihara
G Miyazaki
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Hitachi Ltd
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Hitachi Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/06—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H02M7/10—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode arranged for operation in series, e.g. for multiplication of voltage
    • H02M7/103—Containing passive elements (capacitively coupled) which are ordered in cascade on one source
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/18—Generation of supply voltages, in combination with electron beam deflecting
    • H04N3/185—Maintaining DC voltage constant

Definitions

  • FIG. I PRIOR ART FIG. 2(AI K) O LEVEL FIG. 2(B) FIG. 2(CI iEAGI ---LA
  • the present invention relates to a high voltage circuit of a color television receiver, and more particularly to a high voltage circuit by which the ratio between voltages applied to a shadow mask and to a phosphor screen in an after-focusing type Braun tube is always held constant.
  • an after-focusing type color Braun tube as is well known, it becomes possible to enhance the transmissivity of of the electron beam permeating through the shadow mask, and to attain a high luminance even if a very high voltage is not applied to the shadow mask itself.
  • a voltage E (approximately equal to the voltage E of a funnel portion) which is low as compared with the high voltage E, of a phosphor screen is applied to the shadow mask.
  • the use of the after-focusing type Braun tube is accordingly advantageous in that the current to be supplied to the deflecting yoke may also be small in comparison with that in the prior art.
  • FIG. 1 shows a prior art high voltage circuit of a color television receiver.
  • numeral 1 designates a fly-back transformer, which has a primary winding la and a secondary winding lb.
  • the primary winding la has a horizontal deflection output supplied thereto from a horizontal deflection circuit (not shown).
  • a fly-back pulse appears in the secondary winding lb, and is converted into high DC voltages by means of an n-ple voltage rectifier circuit 2.
  • the n-ple voltage rectifier 2 consists of diodes D D D and capacitors C,, C C and the details of the rectifier are omitted herefrom since it is a circuit which has been well known.
  • a higher voltage is provided at an output terminal 2a than at an output terminal 2b of the circuit 2.
  • the voltage E derived from the output terminal 2a is applied to a phosphor screen 3a of a Braun tube 3, while the voltage E,,, derived from the output terminal 2b is applied to a shadow mask 3b and a funnel portion electrode 30.
  • pulses of a voltage waveform as shown in FIG. 2(A) are produced in the secondary winding lb of the fly-back transformer l.
  • the waveform contains a fly-back pulse A and ringing pulses B.
  • the shape and magnitude of the pulses A and B differ in dependence on the characteristic of the fly-back transformer, the construction of the n-ple voltage rectifier circuit, etc. However, even in case where the design is so made as to render the ringing pulses B as small as possible the pulses do not become null but exist, though slightly, on account of dispersions in the leakage inductance of the fly-back transformer, the values of the capacitors of the n-ple voltage circuit, the inductance and capacitance of the primary side of the flyback transformer, and so forth.
  • the amplitude of the ringing pulse B is indicated by e;,.
  • n and m are the numbers of stages of voltage multiplication associated with the respective signals
  • e and e are the widths of the pulses in the secondary side winding of the fly-back transformer.
  • the ringing pulses cannot be made null, and therefore they exist, though slightly. Accordingly, when the high voltage load fluctuates, the tuning condition of higher harmonics changes. As illustrated in FIG. 2(B), therefore, the amplitude of the ringing pulse B changes. In consequence, the amplitude of the pulse e changes, the ratio e /e changes, and finally the value Eh/E", in equation (3) changes.
  • the present invention consists of a high voltage circuit including a fly-back transformer and an n-ple voltage rectifier device connected on the secondary side of the transformer wherein, when the fly-back transformer is on the third harmonics tuning type, a high voltage stabilizing element is connected between the last stage or an intermediate stage of the voltage multiplication rectifier device and ground.
  • the present invention further consists of a high voltage circuit wherein, when the fiy-back transformer is of the fifth harmonics tuning type, a high voltage stabilizing element is connected between any desired stage of the n-ple voltage rectifier circuit and ground, or the load is connected through a high resistance.
  • FIG. I is a schematic circuit diagram of a prior art high voltage circuit of a color television receiver
  • FIGS. 2(A), 2(3) and 2(C) are waveform diagrams of voltages in the secondary winding of a fly-back transformer
  • FIGS. 3 and 4 are schematic circuit diagrams each showing an embodiment of a high voltage circuit according to the present invention.
  • FIGS. 5(A) and 5(8) are regulation voltage characteristic diagrams of voltages applied to the phosphor screen. respectively;
  • FIGS. 6(A) and 6(8) are waveform diagrams of voltages in the secondary winding of a fly-back transformer in the circuit of the present invention, respectively;
  • FIG. 7 is a schematic circuit diagram showing another embodiment of the high voltage circuit of the present invention.
  • FIG. 8 is a diagram of varying characteristics of the respective voltages of a phosphor screen, a shadow mask and a funnel portion of the tube versus the phosphor screen current;
  • FIG. 9 is a current-voltage characteristic diagram of a voltage stabilizing element
  • FIG. 10 is a schematic circuit diagram showing a further embodiment of the present invention.
  • FIG. 11 is a sketch showing an example of the flyback transformer for use in the circuit of the present invention.
  • FIGS. 12 and 13 are schematic circuit diagrams each showing a still further embodiment of the present invention.
  • FIG. 3 showing an embodiment of the present invention, the same symbols are affixed to the same parts as in FIG. I, and the explanation of such parts therefore will be omitted.
  • a voltage stabilizing element 4 having a constant-voltage characteristic, such as a Zener diode, is connected between the output terminal 2a of any stage, for example, the final stage of the n-ple voltage rectifier circuit 2 and ground.
  • a DC power source 5 is connected between one end of the secondary winding lb of the fly-back transformer l and ground.
  • a capacitor 230 is also provided for tuning the secondary side of the transformer l to the third higher harmonics, while 24 designates a capacitor for making up for the capacity of the phosphor screen 3a.
  • a current 1 flowing through the phosphor screen of the Braun tube 3 and a current I, flowing through the shadow mask 3b become I I, 0 when the luminance is minimized. Accordingly, when the luminance is varied from the minimum to the maximum, the output power of the n-ple voltage rectifier circuit 2 fluctuates as stated below.
  • the DC power source 5 is connected between one end of the secondary winding lb of the flyback transformer l and ground.
  • the voltage ratio between the high voltages E and E,,,( E, can be selected at an adequate value, and can be held substantially constant, so that an afterfocusing type color television receiver with very stable color purity is realizable.
  • FIG. 4 is a circuit diagram showing another embodiment of the present invention.
  • a capacitor 23b adapted to tune the secondary to the fifth higher harmonics is connected on the secondary side of the transformer 1, while a high resistance 4a is connected between the output terminal 2a of the n-ple voltage rectifier circuit 2 and ground.
  • the regulation characteristic of the high output voltage of the voltage multiplication rectifier circuit 2 becomes as shown in FIG. 5(A) in the case of the fifth harmonics tuning type.
  • the regulation characteristic of the high output voltage can be improved as illustrated in FIG. 5(B), in such a way that the high resistance 4a is incorporated as shown in FIG. 4 and that a current 1 is permitted to flow therethrough.
  • the high resistance 4a illustrated in FIG. 4 is a mere example of means for taking out a load from the n-ple voltage rectifier circuit 2.
  • a high resistance may be inserted between the output of any stage in the n-ple voltage rectifier circuit and ground, so as to take out a load equivalent to E 'l
  • a high resistance may be inserted between the output terminals of different stages of the rectifier circuit.
  • the waveform of voltages in the secondary winding of the flyback transformer I becomes as illustrated by solid lines in FIG. 6(A).
  • the fifth harmonics tuning system can reduce the ratio e /e between the ringing pulse amplitude e and the fly-back pulse amplitude e Therefore, when, by way of example, the load current is always kept flowing through the high resistance 4a connected between the output terminal 2a and ground, the input waveform of the voltage multiplication rectifier circuit can be deprived of the ringing pulse amplitude e;, as shown in FIG. 6(B) even in the case where no current is permitted to flow through the Braun tube 2. Accordingly, even if the load currents 1,, and I, change, changes in e /e can be restrained to a very small value.
  • n/m necessary for obtaining the ratio E,,/E,, as required becomes a certain fixed value.
  • the denominator of the second term on the right in equation (8) becomes larger with respect to the fixed value n/m, and a variation due to the fluctuation of e becomes smaller. That is, even if e changes due to a change of the load, the change in E,,/E,,, will be smaller as m and n are made larger.
  • E /E can be held constant even under the fluctuation of the high voltage load, in such manner that the flyback transformer of the fifth harmonics tun- 6 ing system is employed, that the high resistance 4a is connected between any stage of the voltage multiplication rectifier circuit and the earth or another stage and that the load is always derived from the flyback trans- 5 former 1.
  • the fine adjustment of E /El E l can be made in such way that the DC voltage E applied to the lower voltage side of the secondary winding of the fly-back transformer is changed.
  • the ratio E,,/E,, between the high voltage E and the intermediate high voltage'E, E, can be selected at an adequate value, and it is kept constant even with fluctuation of the load of the high voltage power source, so that an after-focusing type color television receiver which is very stable in color purity can be realized.
  • the after-focusing type color television receiver can bringa very stable color purity into realization .by making the ratio of E and E,, E constant as stated above.
  • the beam current of the Braun tube 3 strikes the shadow mask 3b and thus creates secondary electrons, so that halation is likely to occur on the screen.
  • a voltage higher than the mask voltage E, is applied to the funnel portion electrode 3c, whereby the secondary electrons are absorbed by the funnel portion and the halation is prevented from occurring.
  • FIG. 7 is a circuit diagram showing another embodiment of the present invention which has solved the aforesaid problem.
  • a voltage stabilizing element 6, such as a constantvoltage diode, and a resistance 7 are connected in series between the m-th stage and the (m l)-th stage of the n-ple voltage rectifier circuit 2.
  • the output of the voltage multiplication rectifier circuit 2 at the m-th stage is applied to the shadow mask 3b, while the voltage of the juncture between the voltage stabilizing element 6 and the resistance 7 is impressed on the funnel portion electrode 3c.
  • the funnel portion voltage E becomes higher than the shadow mask voltage V,,, by a voltage V across the voltage stabilizing element 6.
  • the series circuit consisting of the voltage stabilizing element 6 and the resistor 7 may also be connected between the m-th stage and any other stage.
  • the ratio between E,, and E should be maintained constant.
  • (E E may be made constant since the ratio between E, and E is held sub stantially constant, as previously stated.
  • the voltage difference (E E is kept substantially constant by the voltage stabilizingelement 6, so that the ratio E,,/E, is held constant after all.
  • the brightness of the receiver is raised by, for example, increasing the phosphor screen current 1
  • the high voltages E E and E decrease.
  • the load currents I; and I increase, thereby to reduce a current 1 flowing through the voltage stabilizing element 6.
  • the characteristic of the voltage stabilizing element 6 is such that, as illustrated in FIG. 9, the voltage V, across the terminals of the element decreases slightly in response to the decrease of the current 1,, flowing therethrough. Therefore, in the case where the high voltage load increases and E and E,, decrease, V changes in the direction of keeping E /E, unchanged, and hence, the ratio E /E is held substantially constant.
  • the ratios between E;, and E,,, and between 5,, and E can be selected at adequate values, respectively, and they are constant even with fluctuation of the load of the high voltage power source, so that an afterfocusing type color television receiver which is very stable in color purity and free from halation can be realized.
  • FIG. shows another embodiment of the present invention.
  • desired higher voltages are produced from the voltage of an intermediate stage M of the voltage multiplication rectifier circuit 2.
  • diodes 9 and 10 are connected in series between the intermediate stage M of the n-ple voltage rectifier circuit 2 and the funnel portion 30.
  • a capacitor 11 is connected in parallel with the diodes 9 and 10.
  • the voltage between the primary winding 1a of the fly-back transformer l and ground is divided by capacitors l2 and 13.
  • the divided voltage is applied through a capacitor 8 to the juncture between the diodes 9 and 10.
  • the voltage of the primary side of the fly-back transformer 1 may be divided by any other impedance elements. Further, the total voltage may be applied without dividing it As a result, there can be obtained, as the output voltage of the diode 10, the voltage E; of a value with a voltage from rectification of the primary voltage of the fiy-back transformer 1 added to the output voltage of the intermediate stage M of the voltage multiplying rectifier circuit 2. In order to more fully stabilize the voltage E, a resistor may be connected in parallel with the capacitor 11.
  • the output voltage of the diode 10 can be arbitrarily varied by changing the division ratio of the primary voltage of the transformer 1. Since only the funnel portion voltage L ⁇ can be varied without changing the output voltage E ofthe voltage multiplication rectifier circuit 2 (the phosphor screen voltage), the ratio E /E; is expressed by the following equation:
  • V is the DC voltage between the point M and the funnel portion 30.
  • the pulse voltage to be applied to the capacitor 8 may also be obtained in such a way that the tertiary winding is provided for the flyback transformer I, to use pulses induced in the windmg.
  • FIG. 11 shows an example of the construction of the transformer in the case where the tertiary winding is provided for the transformer 1 as stated above.
  • numeral 14 designates the iron core of the transformer; 15 is the primary winding; 16 is the secondary winding; and 17 is the tertiary winding.
  • the position of the tertiary winding 17 is moved in the directions of arrows, whereby the coupling coefficients with the other windings change, and the voltage induced in the tertiary winding is also increased or decreased
  • two inductance elements are connected in series on the primary side of the fly-back transformer 1, to obtain a divided voltage from the junction point of the inductance elements.
  • a winding is wound on the iron core of one of the inductance elements, and a current flowing through the winding is varied, whereby the inductance of the element can be varied to change the voltage division ratio.
  • the voltage V in equation (9) can be continuously changed, and E /E can be arbitrarily varied as may be needed.
  • FIG. 12 shows an embodiment as referred to above.
  • Inductance elements 18 and 19 are connected in series on the primary side of the transformer 1.
  • a current is supplied from a DC power source 22 through a variable resistance 21 to the winding 20.
  • the inductance of the inductance element 19 is changed.
  • the value ofthe voltage to be applied to the junction point of the diodes 9 and 10 can accordingly be changed.
  • FIG. 13 shows still another embodiment of the present invention.
  • this circuit in order to apply different voltages to the funnel portion 30 and the shadow mask 3b, a potential at one end of the voltage stabilizing element 6 is applied to the funnel potion 30, while a potential at the other end of the element 6 is applied to the shadow mask 3b.
  • the capacitors 12 and 13 for dividing the primary voltage of the transformer l, the diodes 9 and 10 and the cpaacitor 11 for rectifying and smoothing the divided voltage, etc.
  • a high voltage circuit for a color television receiver comprising:
  • a fly-back transformer means including a primary winding and a secondary winding for producing high voltage pulses from horizontal deflection outputs
  • multiple stage voltage rectifier means made up of double voltage rectifier circuits formed into n stages for producing high DC voltages from the output of said transformer means
  • a Braun tube including a shadow mask, a phos phor screen and a funnel electrode portion
  • n and m are integers, n being greater than m and greater than I, and
  • means including a voltage stabilizing element connected between an output terminal of an I-th stage, where (l 1 g n), of said voltage rectifier means and ground to stabilize the current flowing from said voltage rectifier means through said element to ground, thereby to maintain constant the voltage ratio between the phosphor screen voltage and the shadow mask voltage.
  • a variable DC power source is connected between one end of a secondary winding of said fly-back transformer means and ground, so that the supply voltage of said power source can be varied to thereby perform the fine adjustment of the ratio E /E, between the voltage E applied to said phosphor screen of said Braun tube and the voltage E applied to said shadow mask.
  • the high voltage circuit according to claim 6 wherein a tuning capacitor for taking out fifth higher harmonics is connected in parallel with said secondary winding of said flyback transformer, and wherein said voltage stabilizing element is a resistor having high resistance 10.
  • the high voltage circuit according to claim 9 further comprising means to apply the output voltage of said mth stage of said voltage rectifier means to said funnel electrode portion of said Braun tube.
  • a high voltage circuit for a color television receiver comprising: fly-back transformer means including a primary winding for receiving horizontal deflection outputs. and a secondary winding for producing high voltage output pulses, multiple stage voltage rectifier means made up of double voltage rectifier circuits formedinto n stages for producing high DC voltages from the output of said transformer means, a Braun tube including a shadow mask, a phosphor screen and a funnel electrode portion, means to apply the output of the n-th stage of said voltage rectifier means to said phosphor screen, and means to apply the output of the m-th stage to said shadow mask, where n and m are integers, n is greater than 1 and greater than m, the improvement which comprises a resistor having high resistance connected between an output terminal of the l-th stage (1 I n) of said voltage rectifier means and ground to enable a steady current to flow from said voltage rectifier means through the resistor to ground, means to divide the voltage of the primary winding of said fly-back transformer means, rectifier means to rectify the
  • said voltage dividing means comprises first and second capacitance elements connected in series between one end of said primary winding of said fly-back transformer and ground, said rectifier means compris-.
  • first and second rectifiers connected in series between said stage output terminal and said funnel electrode and a third capacitive element connected between the point of connection of said first and second capacitive elements and the point of connection of said first and second rectifiers.
  • said voltage dividing means comprises first and second inductance elements connected in series between one end of said primary winding of said fly-back transformer and ground, a winding wound on a core of one of said inductance elements, and means to supply a variable current to the last-mentioned winding, whereby a voltage provided from a juncture between said first and second inductance elements can be changed by varying the current of said winding.
  • said transformer means further comprises a third winding movably wound on a core on which said primary and secondary windings are wound, rectifier means to rectify the voltage induced in said tertiary winding, adder means to add the output voltage of-said m-th' stage of said voltage rectifier means and the output voltage of the rectifier means, and means to apply the output voltage of the adder means to said funnel electrode portion of said Braun tube, whereby said tertiary winding may be moved to thereby change its electromagnetic coupling coefficients with the other windings, so as to vary the induced voltage in said tertiary winding.
  • a high voltage circuit for a color television receiver comprising:
  • fly-back transformer means for producing high voltage pulses from horizontal deflection outputs
  • multiple stage voltage rectifier means made up of double voltage rectifier circuits formed into n 5.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Details Of Television Scanning (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
US00329867A 1972-02-04 1973-02-05 High voltage circuit of color television receiver Expired - Lifetime US3846666A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4051514A (en) * 1973-07-31 1977-09-27 Hitachi, Ltd. High-voltage circuit for post focusing type color picture tube
US4066955A (en) * 1975-12-29 1978-01-03 General Electric Company High voltage transformer winding assembly with multiple frequency tuning
US4144480A (en) * 1976-01-09 1979-03-13 Hitachi, Ltd. High voltage generating apparatus
FR2547127A1 (fr) * 1983-03-22 1984-12-07 Victor Company Of Japan Generateur de haute tension continue
EP0285199A1 (en) * 1987-03-23 1988-10-05 Koninklijke Philips Electronics N.V. Power supply circuit with two output voltages
US10856398B2 (en) 2014-09-26 2020-12-01 Nikon Metrology Nv High voltage generator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50133822U (enrdf_load_stackoverflow) * 1974-04-19 1975-11-04
JPS5175129U (enrdf_load_stackoverflow) * 1974-12-11 1976-06-12

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3417285A (en) * 1966-02-07 1968-12-17 Electrohome Ltd Variable voltage networks
US3500116A (en) * 1967-10-31 1970-03-10 Philips Corp Deflection circuit for regulating the high voltage load
US3546630A (en) * 1968-09-18 1970-12-08 Gen Electric Self-oscillating sweep circuit having a ringing circuit connected in series with a feedback winding
US3609446A (en) * 1969-06-02 1971-09-28 Rca Corp Power supply utilizing a diode and capacitor voltage multiplier for tracking focusing and ultor voltages

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3417285A (en) * 1966-02-07 1968-12-17 Electrohome Ltd Variable voltage networks
US3500116A (en) * 1967-10-31 1970-03-10 Philips Corp Deflection circuit for regulating the high voltage load
US3546630A (en) * 1968-09-18 1970-12-08 Gen Electric Self-oscillating sweep circuit having a ringing circuit connected in series with a feedback winding
US3609446A (en) * 1969-06-02 1971-09-28 Rca Corp Power supply utilizing a diode and capacitor voltage multiplier for tracking focusing and ultor voltages

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4051514A (en) * 1973-07-31 1977-09-27 Hitachi, Ltd. High-voltage circuit for post focusing type color picture tube
US4066955A (en) * 1975-12-29 1978-01-03 General Electric Company High voltage transformer winding assembly with multiple frequency tuning
US4144480A (en) * 1976-01-09 1979-03-13 Hitachi, Ltd. High voltage generating apparatus
FR2547127A1 (fr) * 1983-03-22 1984-12-07 Victor Company Of Japan Generateur de haute tension continue
US4611152A (en) * 1983-03-22 1986-09-09 Victor Company Of Japan, Limited High DC voltage generator
EP0285199A1 (en) * 1987-03-23 1988-10-05 Koninklijke Philips Electronics N.V. Power supply circuit with two output voltages
US10856398B2 (en) 2014-09-26 2020-12-01 Nikon Metrology Nv High voltage generator

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