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US 4,051,514 AGranted
High-voltage circuit for post focusing type color picture tube
AssigneeHitachi, Ltd.
InventorsNobuyuki Suzuki, Toyotaro Nishihara
Life of this patent
Estimating the term…
Abstract
A high-voltage circuit for post focusing type color picture tube is disclosed in which a high voltage and a higher voltage are produced respectively from the middle and final stages of a voltage-multiplying rectifier circuit connected to the output winding of a fly-back transformer. The voltage-multiplying rectifier circuit comprises a plurality of rectifier elements and a plurality of capacitor elements. The fly-back transformer has its leakage inductance and the like adjusted so as to be tuned to the 7th or higher-order harmonic of fly-back pulses.
Claims28
A high voltage circuit for generating a plurality of high voltages of different values for a color picture tube of post focusing type, comprising:
- a fly-back transformer including a first resonance circuit having such a parasitic constant as to be tuned to a higher harmonic with a frequency which is an odd number times as high as the fundamental frequency of fly-back pulses, said odd number being not less than 7;
- a voltage-multiplying rectifier circuit with multiple stages connected to a secondary winding of said fly-back transformer and having an output terminal at the final stage thereof and another output terminal at an intermediate stage thereof, said voltage-multiplying rectifier circuit further including a plurality of rectifier elements and a plurality of capacitor elements;
- a voltage stabilizing element and a resistor both connected in series between an output terminal of the m-th stage and another output terminal of a higher middle stage of said multiple-stage voltage-multiplying rectifier circuit;
- and
- means for collecting a third high voltage from the junction point of said voltage stabilizing element and said resistor.
2 more elements
A high voltage circuit for generating a plurality of high voltages of different values for a color picture tube of post focusing type, comprising:
- a fly-back transformer including a first resonance circuit having such a parasitic constant as to be tuned to a higher harmonic with a frequency which is an odd number times as high as the fundamental frequency of fly-back pulses, said odd number being not less than seven;
- a voltage-multiplying rectifier circuit with multiple stages connected to a secondary winding of said fly-back transformer and having an output terminal at the final stage thereof and another output terminal at an intermediate stage thereof, said voltage-multiplying rectifier circuit further including a plurality of rectifier elements and a pluality of capacitor elements;
- means for producing fly-back pulses from said fly-back transformer;
- a rectifier circuit for rectifying said fly-back pulses obtained by said means;
- and
- means for adding the output voltage of said rectifier circuit to a high voltage obtained from an output terminal of an intermediate stage of said multiple-stage voltage-multiplying rectifier circuit and producing an output which is the result of said adding operation.
3 more elements
In a high voltage circuit for generating a plurality of high voltages of different values for the color picture tube of post focusing type, comprising:
- A fly-back transformer including a primary winding to which horizontal output pulses are supplied and a secondary winding for producing thereacross high voltage fly-back pulses;
- multiple stage multiplying voltage rectifier means connected to a terminal of the secondary winding of said fly-back transformer and made up of voltage rectifier circuits formed into n stages for producing high DC voltages;
- means for obtaining a first DC voltage from the n-th stage of said voltage rectifier means, where n is an integer and is greater than 1;
- means for outputting a second DC voltage obtained from the m-th stage of said voltage rectifier means, where m is an integer and (1<m<n);
- and
- a first voltage stabilizing element connected between an output terminal of an l-th stage of said voltage rectifier means and a reference potential, where l is an integer and (1<l.ltorsim.n), the improvement comprising a first resonance circuit made up of leakage inductance and distributed capacitance of said fly-back transformer and having such a parasitic constant as to be tuned to a higher harmonic with a frequency which is an odd number times as high as the fundamental frequency of the fly-back pulses, said odd number being not less than seven.
3 more elements
In a high voltage circuit for generating a plurality of high voltages of different values for the color picture tube of post focusing type, comprising:
- a fly-back transformer including a primary winding to which horizontal output pulses are supplied and a secondary winding for producing thereacross high voltage fly-back pulses;
- multiple stage multiplying voltage rectifier means connected to a terminal of the secondary winding of said fly-back transformer and made up of voltage rectifier circuits formed into n stages for producing high DC voltages;
- means for obtaining a first DC voltage from the n-th stage of said voltage rectifier means, where n is an integer and is greater than 1;
- means for outputting a second DC voltage obtained from the m-th stage of said voltage rectifier means, where m is an integer and (1<m<n);
- a first voltage stabilizing element connected between an output terminal of an l-th stage of said voltage rectifier means and a reference potential, where l is an integer and (1<l.ltorsim.n), the improvement comprising a first resonance circuit made up of leakage inductance and distributed capacitance of said fly-back transformer and having such a parasitic constant as to be tuned to a higher harmonic with a frequency which is an odd number times as high as the fundamental frequency of the fly-back pulses, said odd number being not less than seven;
- and
- a second resonance circuit connected to at least one of the primary winding and the secondary winding of said fly-back transformer and adapted to be tuned to a higher harmonic of a frequency which is an integral multiple of the fundamental frequency of the fly-back pulse signal, said integral multiple frequency being different from the higher harmonic frequency tuned in said first resonance circuit.
4 more elements
A high voltage circuit for generating a plurality of high voltages of different values for a color picture tube of post foucsing type, comprising:
- a fly-back transformer including a first resonance circuit having such a parasitic constant as to be turned to a higher harmonic with a frequency which is an odd number times as high as the fundamental frequency of fly-back pulses, said odd number being not less than nine
- multiple stage multiplying voltage rectifier means made up of voltage rectifier circuits formed into n stages for producing high DC voltages from the output of said fly-back transformer and connected to one terminal of the secondary winding of said fly-back transformer;
- means for obtaining a first DC voltage from the n-th stage of said voltage rectifier means, where n is an integer and is greater than 1;
- means for outputting a second DC voltage obtained from the m-th stage of said voltage rectifier means, where m is an integer and where (1<m<n);
- a first voltage stabilizing element connected between an output terminal of an l-th stage of said voltage rectifier means and a reference potential, where l is an integer and where (1<l.ltorsim.n);
- a second voltage stabilizing element and a resistor both connected in series between an output terminal of the k-th stage and another output terminal of said multiple stage voltage rectifier means, where k is an integer and where (l<k<n), the voltage of said another terminal being higher than that of k-th stage;
- and
- means for obtaining a third high voltage from the junction point of said second voltage stabilizing element and said resistor.
5 more elements
A high voltage circuit for generating a plurality of high voltages of different values for a color picture tube of post focusing type, comprising:
- a fly-back transformer including a first resonance circuit having such a parasitic constant as to be turned to a higher harmonic with a frequency which is an odd number times as high as the fundamental frequency of fly-back pulses, said odd number being not less than nine;
- multiple stage multiplying voltage rectifier means made up of voltage rectifier circuits formed into n stages for producing high DC voltages from the output of said fly-back transformer and connected to one terminal of the secondary winding of said fly-back transformer;
- means for outputting a first DC voltage obtained from the n-th stage of said voltage rectifier means, where n is an integer and is greater than 1;
- means for obtaining a second DC voltage from the m-th stage of said voltage rectifier means, where m is an integer and where (1<m<n);
- a first voltage stabilizing element connected between an output terminal of an l-th stage of said voltage rectifier means and a reference potential where l is an integer and where (1<l.ltorsim.n);
- means for obtaining fly-back pulses from said fly-back transformer;
- a rectifier circuit for rectifying said fly-back pulses obtained by said obtaining means;
- and
- means for adding the output voltage of said rectifier circuit a high voltage obtained from an output terminal of an intermediate stage of said multiple stage voltage rectifier means and producing an output which is the result of said adding operation.
6 more elements
A high voltage circuit for generating a plurality of high voltages of different values for a color picture tube of post focusing type, comprising:
- a fly-back transformer including a first resonance circuit made up of leakage inductance and distributed capacitance of said fly-back transformer and having such a parasitic constant as to be tuned to a higher harmonic with a frequency which is an odd number times as high as the fundamental frequency of a fly-back pulse signal, said odd number being not less than nine;
- a voltage-multiplying rectifier circuit with multiple stages connected to a secondary winding of said fly-back transformer and having a first output terminal at the final stage thereof and second and third output terminals at intermediate stages thereof, said voltage-multiplying rectifier circuit further including a plurality of rectifier elements and a plurality of capacitor elements;
- means for deriving the plurality of high voltages of different values for the color picture tube from said first and second output terminals;
- a voltage stabilizing element connected between said third output terminal and a reference potential;
- and
- a second resonance circuit connected to at least one of the primary winding and the secondary winding of said fly-back transformer and adapted to be turned to a higher harmonic of a frequency which is an integral multiple of the fundamental frequency of the fly-back pulses, said integral multiple being different from the one to which said first resonance circuit is tuned.
3 more elements
A high voltage circuit for generating a plurality of high voltages of different values for a color picture tube of post focusing type, comprising:
- a fly-back transformer including a resonance circuit having such a parasitic constant as to be tuned to a higher harmonic with a frequency which is an odd number times as high as the fundamental frequency of fly-back pulses, said odd number being not less than seven for providing improved high voltage circuit operation with respect to lower order odd number harmonic tuning;
- a voltage-multiplying rectifier circuit with multiple stages connected to a secondary winding of said fly-back transformer and having at least first and second output terminals at different respective stages of said voltage-multiplying rectifier circuit;
- and
- means for deriving the plurality of high voltages of different values for the color picture tube from the at least first and second output terminals.
1 more element
A high voltage circuit for generating a plurality of high voltages of different values for a color picture tube of post focusing type, comprising:
- a fly-back transformer having a primary winding and a secondary winding;
- means for tuning said fly-back transformer to a higher harmonic with a frequency which is an odd number times as high as the fundamental frequency of fly-back pulses, said odd number being not less than seven;
- a voltage-multiplying rectifier circuit with multiple stages connected to the secondary winding of said fly-back transformer and having at least first and second output terminals at respective different stages of said voltage-multiplying rectifier circuit;
- and
- means for deriving the plurality of high voltages of different values for the color picture tube from at least said first and second output terminals.
2 more elements
Dependencies are inferred from the claim text.