With Diode Or Amplifier Across Coil Patents (Class 315/407)
  • Patent number: 7023149
    Abstract: The invention concerns a scanning circuit, comprising a power supply providing a negative voltage on a first terminal (Tdown), an intermediate voltage on a second terminal (Gnd) and a positive voltage on a terminal of a switch (S), the other terminal of the switch being connected to a third terminal (Tup), a control circuit (6) supplied by connections to the second and third terminals, a differential amplifier receiving a positive and a negative input signal provided by the control circuit, a power amplifier controlled by the differential amplifier, both amplifiers being supplied by connections to the first and third terminals, a deflection coil (Ly) connected between the output of the power amplifier and the second terminal, biasing means setting, when the switch is open, the output of the differential amplifier so that the possible current paths through the power amplifier between the deflection coil and the first terminal are cut.
    Type: Grant
    Filed: March 30, 2004
    Date of Patent: April 4, 2006
    Assignee: STMicroelectronics S.A.
    Inventor: Jean-Michel Moreau
  • Publication number: 20040135516
    Abstract: It is capable of independently modulating the scanning velocities of multiple electron beams having a beam interval. Allowing a current to pass through the velocity modulation coils results in modulation of the scanning velocities of the multiple electron beams (19A, 19B) emitted from electron guns contained in a neck portion of a cathode ray tube to sharpen the outline of picture. The velocity modulation coils have a coil configuration including three upper coils (27A, 27B, and 27C) and lower three coils (28A, 28B, and 28C) for respectively generating asymmetrical quadri-pole magnetic fields. The magnetic fields independently generated by these two types of the velocity modulation coils allows the scanning velocities of the multiple electron beams (19A, 19B) to be almost independently modulated.
    Type: Application
    Filed: November 5, 2003
    Publication date: July 15, 2004
    Inventor: Toshiya Takagishi
  • Publication number: 20030030389
    Abstract: A horizontal deflection circuit output stage includes a trace capacitor for developing a trace voltage. A retrace capacitance is coupled to a deflection winding to form a retrace resonant circuit with the deflection winding, during a retrace interval of a deflection cycle. A rectifier for rectifying a retrace pulse voltage developed in the retrace capacitance. A switching transistor is coupled to the inductance and to the trace capacitor for applying the rectified retrace pulse voltage to the inductance to generate a current in the inductance. The inductance current is coupled to the trace capacitor, during the trace interval, to provide for linearity correction. The rectifier is coupled to the switching transistor for producing a rectified control signal at a control terminal of the switching transistor to cause a change of state in the switching transistor, during the retrace interval.
    Type: Application
    Filed: April 18, 2002
    Publication date: February 13, 2003
    Inventor: Rudolph Weber
  • Publication number: 20020070691
    Abstract: The present invention relates to a power-saving apparatus and method for computer peripheral devices.
    Type: Application
    Filed: January 2, 2001
    Publication date: June 13, 2002
    Inventors: Kil-Soo Park, Jin-Sang Hwang
  • Patent number: 6384548
    Abstract: A horizontal deflection circuit comprising a centering circuit designed to change a direction of supplying a current to a deflection yoke, thereby to move a raster in a horizontal direction and, hence, adjust the position of the raster. The centering circuit comprises: a diode, of which cathode which is connected to the node of an S-shaped capacitor and the deflection yoke; a capacitor connected to the anode of the diode; a switching element connected in parallel to the diode; and a switching element control section for opening and closing the switching element, thereby to control a current to be supplied from the S-shaped capacitor to the capacitor and to control, ultimately, a current to be supplied to the deflection yoke. The raster position can be therefore continuously adjusted.
    Type: Grant
    Filed: September 13, 1999
    Date of Patent: May 7, 2002
    Assignee: Sony Corporation
    Inventor: Ken Kikuchi
  • Patent number: 6323607
    Abstract: A horizontal drive circuit for a video display device includes a switching device for switching according to a horizontal oscillation frequency generated by a horizontal oscillator and a surge protector, and a method therefor. A driving transformer has a primary winding connected to the switching means and a secondary winding. The secondary winding provides an amplified current according to the status of the switching device. A diode serves as the surge protection connected between the switching device and the primary winding of the driving transformer.
    Type: Grant
    Filed: December 29, 1998
    Date of Patent: November 27, 2001
    Assignee: Samsung Electronics Co., LTD
    Inventor: Sung-Tae Kwon
  • Patent number: 5841223
    Abstract: A color cathode ray tube is disclosed in which a coating containing an aluminum phosphorus compound and fine particles of at least one of tungsten oxide and bismuth oxide and is formed on the surface of a shadow mask on the side of an electron gun.
    Type: Grant
    Filed: January 25, 1995
    Date of Patent: November 24, 1998
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Sachiko Muramatsu, Yasuhisa Ohtake
  • Patent number: 4247805
    Abstract: A circuit for driving a saw-tooth current in a coil includes a deflection circuit formed by the coil connected in parallel with a retrace capacitor and in series with a trace capacitor. The deflection circuit is connected in parallel with a first diode which conducts during the first half of the trace interval and in parallel with a second diode connected in series with a controllable switch which conducts during the second half of the trace interval. While the transistor is conductive, current flows through an inductor connected in series with it. The energy stored in this inductor is transferred at a subsequent stage partly to the deflection circuit and partly to a further capacitor. The further capacitor subsequently itself transfers the charge stored in it through a second inductor and a fourth diode to the deflection circuit so that at no time is energy dissipated in a load.
    Type: Grant
    Filed: May 23, 1979
    Date of Patent: January 27, 1981
    Assignee: Indesit Industria Elettrodomestici Italiana
    Inventor: Giuseppe Zappala
  • Patent number: 4115725
    Abstract: A horizontal deflection output circuit free of a damper diode includes a horizontal output transistor, between collector and emitter of which a series circuit of a horizontal deflection coil and S-distortion compensation capacitor and a resonance capacitor are connected, and a pulsating switching signal is supplied between the base and emitter of the transistor through an inductive coupling so that the transistor is switched on and off by the pulsating switching signal. An excitation circuit of the horizontal output circuit comprises an excitation transformer having a secondary winding thereof connected to the base-emitter circuit of the output transistor and an excitation transistor connected to a primary winding of the excitation transformer.
    Type: Grant
    Filed: December 28, 1976
    Date of Patent: September 19, 1978
    Assignee: Hitachi, Ltd.
    Inventor: Yoitiro Hashimoto
  • Patent number: 4028585
    Abstract: A circuit in a color television receiver for generating a correction current of field frequency for a quadripolar winding which is positioned on the core of the deflection coil. The circuit is in series with the deflection coil and constitutes a bridge circuit with diodes and resistors. A resistor is included in one diagonal branch and the winding in the other.
    Type: Grant
    Filed: March 11, 1976
    Date of Patent: June 7, 1977
    Assignee: U.S. Philips Corporation
    Inventors: Adrianus Hubertus Kantelberg, Leonardus Albertus Antonius Valkestijn
  • Patent number: 3950674
    Abstract: Circuit arrangement for combined line deflection and supply voltage stabilisation. The switched-mode transformer is connected via the secondary diode to a tapping on a winding coupled with the high-voltage winding. As a result, the maximum collector voltage is reduced and a greater range of supply voltage variations can be accommodated. All the windings may be wound on the same core.
    Type: Grant
    Filed: July 1, 1974
    Date of Patent: April 13, 1976
    Assignee: U.S. Philips Corporation
    Inventors: Louis Geradus Josephus Joosten, Oswald Johannes Verbeij
  • Patent number: 3950672
    Abstract: A vertical sweep circuit includes a first transistor supplied with a sawtooth voltage. A voltage drop is developed across a resistor by a vertical sweep current for producing a first voltage across a first load. A second transistor is supplied with the first voltage for producing a second voltage across a second load, and a pair of push-pull connected transistors are supplied with the second voltage for producing the sweep current. An additional transistor of the same conductivity type as the second transistor is included in the circuit. Responsive to the first voltage, the additional transistor produces voltage pulses at a point of connection thereto of an additional load, which is greater than the second load to make the second and additional transistors operate as a linear amplifier transistor and a switching transistor, respectively. Vertical blanking pulses are produced from the voltage pulses.
    Type: Grant
    Filed: June 10, 1974
    Date of Patent: April 13, 1976
    Assignee: Nippon Electric Co., Ltd.
    Inventors: Hirokazu Fukaya, Kenji Andou, Akio Nakashima
  • Patent number: 3939380
    Abstract: A class D amplifier, suitable for use as a vertical deflection amplifier in a television receiver, includes two transistors coupled to function in a push-pull manner. Two diodes are serially coupled with each other in parallel with the output transistors and are poled to conduct forward current in a direction opposite to the forward current of the two transistors. A junction of the two transistors is coupled to a junction of the two diodes and forms an output terminal to which a deflection winding is coupled. A series of pulses at a first frequency, such as the horizontal deflection frequency or a multiple thereof, are pulse width modulated in accordance with the amplitude of a sawtooth waveform at a second frequency, such as the vertical deflection frequency, in a pulse width modulation stage and are coupled to the input terminals of the two transistors. The two transistors are alternately enabled for conduction by the pulse width modulated signals.
    Type: Grant
    Filed: February 21, 1974
    Date of Patent: February 17, 1976
    Assignee: RCA Corporation
    Inventor: John Charles Peer