Horizontal deflection output circuit for high-frequency horizontal scanning
AssigneeSamsung Electronics Co., Ltd.
InventorsJoong-Yeol Kwon, Hideki Kofune
Life of this patent
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Abstract
A horizontal deflection output circuit has a resonance circuit including a horizontal deflection yoke for generating the horizontal deflection signal, a first switch element, a second switch element comprising a bipolar transistor, and a circuit for applying a reverse bias voltage to the emitter-base junction of the bipolar transistor during a retrace period to remove excess minority carriers stored in its base rapidly, thereby making high speed switching operation of the transistor possible.
Claims29
A horizontal deflection output circuit for providing a horizontal deflection signal to a deflection yoke of a cathode ray tube in response to a horizontal deflection driving signal, comprising:
- first switching means responsive to the horizontal deflection driving signal for providing a control signal;
- second switching means connected between said first switching means and the horizontal deflection yoke, and responsive to said control signal for carrying out a switching operation, wherein said second switching means includes a power source and a bipolar transistor, said bipolar transistor having an emitter connected to said first switching means, a base connected directly through a first resistor to said power source, and a collector, said emitter and said base forming an emitter-base junction;
- bias means for applying a reverse bias voltage to said emitter-base junction of said bipolar transistor during a retrace period;
- resonant means for forming, with the deflection yoke, a resonance circuit connected to said collector so as to oscillate the horizontal deflection signal flowing through the deflection yoke;
- and
- damping means for preventing oscillation of the horizontal deflection signal by the resonance circuit when a polarity of a voltage induced on the deflection yoke changes.
A horizontal deflection output circuit for providing a horizontal deflection output signal to a cathode ray tube in response to a horizontal deflection driving signal, comprising:
- first switching means responsive to the horizontal deflection driving signal for providing a control signal;
- second switching means including a bipolar transistor, and responsive to said control signal for carrying out a switching operation, said bipolar transistor having a base which tends to store minority carriers;
- means for removing excess minority carriers stored in said base of said bipolar transistor during a retrace period;
- and
- resonance circuit means connected to said second switching means for generating the horizontal deflection output signal;
- wherein said second switching means further comprises a power source connected to said base of said bipolar transistor, said bipolar transistor having an emitter;
- and
- wherein said means for removing the excess minority carriers comprises an inductor having one end connected directly to said emitter and another end connected directly through a resistor to said power source.
A horizontal deflection output circuit for providing a horizontal deflection output signal to a cathode ray tube in response to a horizontal deflection driving signal, comprising:
- resonance circuit means including a horizontal deflection yoke for generating the horizontal deflection output signal;
- a first switching element responsive to the horizontal deflection driving signal;
- a second switching element connected to said first switching element and including a power source, a first resistor connected directly to said power source, and a bipolar transistor, said bipolar transistor having a collector connected to said resonance circuit means, a base connected to said first resistor, and an emitter connected to said first switching element, said second switching element further comprising a second resistor connected to said power source and said emitter, said emitter and said base forming an emitter-base junction;
- and
- bias means for applying a reverse bias voltage to said emitter-base junction of said bipolar transistor during a retrace period.
A horizontal deflection output circuit for providing a horizontal deflection signal to a deflection yoke of a cathode ray tube in response to a horizontal deflection driving signal, comprising:
- a first switch responsive to the horizontal deflection driving signal for providing a control signal;
- a second switch connected between said first switch and the horizontal deflection yoke, and responsive to said control signal for carrying out a switching operation, wherein said second switch includes a power source and a switching element, said switching element having a first electrode connected to said first switch, a second electrode connected directly through a first resistor to said power source, and a third electrode, said first and second electrodes forming a junction;
- a bias circuit for applying a reverse bias voltage to said junction during a retrace period;
- a resonant circuit connected to said third electrode so as to oscillate the horizontal deflection signal flowing through the deflection yoke;
- and
- a damping circuit for preventing oscillation of the horizontal deflection signal by the resonance circuit when a polarity of a voltage induced on the deflection yoke changes.
A horizontal deflection output circuit for providing a horizontal deflection output signal to a cathode ray tube in response to a horizontal deflection driving signal, comprising:
- a first switch responsive to the horizontal deflection driving signal for providing a control signal;
- a second switch including a switching element responsive to said control signal for carrying out a switching operation, said switching element having a first electrode which tends to store minority carriers;
- means for removing excess minority carriers stored in said first electrode during a retrace period;
- and
- a resonance circuit connected to said second switch for generating the horizontal deflection output signal;
- wherein said second switch further comprises a power source connected to said first electrode, said switching element having a second electrode;
- and
- wherein said means for removing the excess minority carriers comprises an inductor having one end connected directly to said second electrode and another end connected directly through a resistor to said power source.
A horizontal deflection output circuit for providing a horizontal deflection output signal to a cathode ray tube in response to a horizontal deflection driving signal, comprising:
- a resonance circuit including a horizontal deflection yoke for generating the horizontal deflection output signal;
- a first switching element responsive to the horizontal deflection driving signal;
- a second switching element connected to said first switching element and including a power source, a first resistor connected directly to said power source, and a switch having a first electrode connected to said resonance circuit, a second electrode serving as a central electrode connected to said first resistor, and a third electrode connected to said first switching element, said second switching element further comprising a second resistor connected to said power source and said third electrode, said second and third electrodes forming a junction;
- and
- a bias circuit for applying a reverse bias voltage to said junction during a retrace period.
Dependencies are inferred from the claim text.