Push-pull Deflection Circuit Patents (Class 315/396)
  • Patent number: 9979189
    Abstract: A control apparatus using variations in conduction angle as control command, wherein a conduction angle modulation module of a traditional leading edge cutoff dimmer is arranged in parallel with a resistance module, so as to enlarge the minimum conduction angle of the leading edge dimmer. The modulation range of the conduction angle of the conduction angle modulation module may be set to a smaller range, so that the modulation range of the resistance module will not be uncertain due to different setting values of the variable resistance, whereby the circuit at load end can be identified readily and function mode switching facilitated to achieve the effect of multiplexing control.
    Type: Grant
    Filed: February 5, 2016
    Date of Patent: May 22, 2018
    Assignee: Jaguar Precision Industry Co., Ltd.
    Inventors: Fei-Tyh Chuang, Zhen-Gong Xie
  • Patent number: 7999483
    Abstract: A circuit arrangement (1) for driving an electrical load (13) comprises a first and a second terminal (2, 3) for feeding a first and a second control signal (S1, S2), a first output (23), to which an electrical load (13) can be coupled, a current source (9), which is coupled to the first output (23), and a control device (5). The control device is coupled to the first and the second terminal (2, 3) and comprises a programming circuit (6) and a trigger circuit (7), which are each coupled on the output side to a control input of the current source (9).
    Type: Grant
    Filed: February 8, 2007
    Date of Patent: August 16, 2011
    Assignee: Austriamicrosystems AG
    Inventor: Peter Trattler
  • Patent number: 6573669
    Abstract: A circuit for driving a cathode ray tube (CRT) with frequency compensation. Specifically, the present invention discloses a CRT driver circuit comprising a cascode gain stage for amplifying an input voltage. A cascode push-pull output stage generates a video output signal from the input voltage at an output node. The video output signal drives a coupled CRT and corresponding CRT cathode. A biasing node within the push-pull output stage has a biasing voltage that is always higher than the output voltage of the video output signal. Electrodes of a vertical-integrated PNP transistor are adaptively coupled to the biasing node, output node, and the cascode gain stage to provide two parallel feedback paths for frequency compensation without any cathode current leakage. As such, a current detection circuit accurately measures cathode current from a CRT that is driven by the CRT driver circuit.
    Type: Grant
    Filed: October 9, 2001
    Date of Patent: June 3, 2003
    Assignee: National Semiconductor Corporation
    Inventor: Hon Kin Chiu
  • Patent number: 6538398
    Abstract: A circuit for driving a cathode ray tube (CRT) with cathode current detection. Specifically, the present invention discloses a CRT driver circuit comprising a push-pull configuration comprising upper and lower stages of darlington paired transistors. In the lower stage, a lower prestage circuit generates a video output signal in response to a video input signal that is amplified to drive a cathode electrode of a coupled CRT. In the upper stage, an upper prestage circuit of transistors drives a voltage divider for splitting a high voltage supply between the transistors in the lower prestage circuit. In both the upper and lower stages of darlington paired transistors, upper and lower output stages of transistors are electrically active only during transient periods of the video input signal. As such, a cathode current from a static test signal can be measured from an output through the lower prestage circuit.
    Type: Grant
    Filed: August 6, 2001
    Date of Patent: March 25, 2003
    Assignee: National Semiconductor Corporation
    Inventor: Hon Kin Chiu
  • Patent number: 6320332
    Abstract: A series arrangement of an isolating diode and an East-West switching transistor is coupled between a flyback transformer primary winding and a horizontal deflection output transistor circuit to control retrace energy to obtain an East-West modulation of the deflection current amplitude. A first inductor, a tapped inductor and an S-shaping capacitor are coupled via a switch to form a resonant circuit, during the first half of trace. The tapped inductor includes a portion forming a current path for a deflection current. The tapped inductor develops a voltage that controls the switch. The first inductor, the tapped inductor and the S-shaping capacitor are coupled via the switch to form the trace resonant circuit, during the first half of trace. The trace resonant circuit provides inside pincushion raster distortion correction.
    Type: Grant
    Filed: September 8, 2000
    Date of Patent: November 20, 2001
    Assignee: Thomson Licensing S.A.
    Inventor: Rudolf Weber
  • Patent number: 6125563
    Abstract: A container apparatus having a label for grasping the container to which it is attached includes a receiving surface and a label partially affixed to the container. The label includes a first portion of filmic material affixed to the receiving surface for displaying printed matter and a second portion of filmic material extending outward from the receiving surface, the second portion of filmic material having two back-to-back layers forming a handle of sufficient length to allow grasping thereof with one's fingers. The label-handle further includes an apparatus for affixing a label to a container in a fashion whereby the label forms a handle for grasping the container.
    Type: Grant
    Filed: February 14, 1997
    Date of Patent: October 3, 2000
    Inventor: Philippe H. Girerd
  • Patent number: 5550442
    Abstract: A horizontal deflection circuit is provided which is useful in a television receiver and a video apparatus using a cathode ray tube, and which generates a deflection current for horizontally deflecting electron beams by changing a magnetic field applied to the cathode ray tube, and in which a resonance circuit using LC parts is not employed, and the vertical line distortion correction and the control of the horizontal deflection current in the multiscan are conducted by changing the duty ratios of switch elements, thereby simplifying the circuit configuration, and reducing the cost and the loss.
    Type: Grant
    Filed: December 15, 1994
    Date of Patent: August 27, 1996
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Toshinari Ueyama, Nobuyoshi Nagagata
  • Patent number: 5428271
    Abstract: There is provided a sine wave deflecting circuit having a resonance circuit comprising a deflecting coil and a resonance capacitor and a circuit for detecting a signal waveform of the resonance circuit and for driving the resonance circuit on the basis of the detection signal, in which the deflecting coil is sine-wave driven by the self-oscillation. A rectangular wave driving circuit which is constructed by connecting first and second switching elements such as FETs through a capacitor is provided at one end of the deflecting coil.
    Type: Grant
    Filed: May 9, 1994
    Date of Patent: June 27, 1995
    Assignee: Sony Corporation
    Inventors: Junzo Watanabe, Hitoshi Suzuki
  • Patent number: 5349274
    Abstract: In a dual direction horizontal bi-directional scan circuit, deterioration of the picture quality is prevented, while linearity is improved without supplying wasteful deflecting current, and pin distortion is corrected. The deflecting current in the going scan and in the returning scan are supplied to each deflecting coil by first and second resonance circuits, and capacitors substantially the same in capacitance are provided in the first and second resonance circuits to bias the deflecting voltage so that the terminal voltage and the power source voltage of the capacitors are synchronized to the vertical synchronizing signals to produce a parabolic modulation.
    Type: Grant
    Filed: May 21, 1993
    Date of Patent: September 20, 1994
    Assignee: Sony Corporation
    Inventors: Junzo Watanabe, Akihiro Ueyama, Ban Kawamura
  • Patent number: 5138239
    Abstract: A vertical amplifier apparatus with a beam-finding function for an oscilloscope including an analog multiplier and a gain control circuit. The analog multiplier multiplies an input signal to the vertical amplifier by a gain control signal. The gain control circuit outputs a DC voltage as the gain control signal. In a beam-finding mode, the gain control circuit supplies the analog multiplier with the gain control signal whose absolute value is much smaller than that of the gain control signal in a normal mode. This makes is possible to obviate a dedicated beam-finder circuit. In a multi-channel oscilloscope, the beam-finding operation can be performed independently for each channel.
    Type: Grant
    Filed: October 16, 1991
    Date of Patent: August 11, 1992
    Assignee: Kikusui Electronics Corporation
    Inventors: Masao Izawa, Hidenori Tomishima
  • Patent number: 4771217
    Abstract: A deflection current from a vertical deflection output circuit is supplied to a series circuit of a vertical deflection coil and a capacitor. A pair of transistors are coupled to a DC voltage source in a complementary arrangement. The bases of these transistors are coupled to a slidable end of a variable resistor coupled to the DC voltage source, respectively through constant voltage elements, which are coupled to each other in the opposite directions. The node of these two transistors is coupled to the node of the deflection coil and the capacitor. As the position of the slidable end of the variable resistor is moved away from the center, one transistor of the pair becomes conductive. With this arrangement, a deflection current free of ripple components can be supplied to the deflection coil in order to adjust the vertical position of an image on the screen of a CRT.
    Type: Grant
    Filed: March 25, 1987
    Date of Patent: September 13, 1988
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Hideo Yamanaka
  • Patent number: 4712047
    Abstract: A cathode ray beam deflection system operable in slew and random stroke and periodic raster display modes provides automatic power supply voltage switching to maintain linear operation and high efficiency. Control of automatic switching is obtained by continuously monitoring yoke voltage, yoke current, and deflection voltage, a power supply voltage being switched to a voltage of higher magnitude to provide a higher deflection rate when the yoke voltage exceeds a predetermined level at a predetermined current polarity and returned to a power supply voltage of lower magnitude when the higher deflection rate is no longer required.
    Type: Grant
    Filed: June 27, 1986
    Date of Patent: December 8, 1987
    Assignee: Sperry Corporation
    Inventor: Paul F. L. Weindorf
  • Patent number: 4677352
    Abstract: A deflection drive circuit (15) for an inductive yoke (11) used with a raster scanned cathode ray tube rapidly interrupts current then reverses voltage applied to the yoke (11) during flyback. MOSFETs (Q32, Q47) are used to control current flow to the yoke. The current is interrupted by one MOSFET (Q32) being gated "OFF", after which current is permitted to flow to a capacitor (C51). At a preselected time, a second MOSFET (Q47) is gated on to admit reverse flow of current from the capacitor (C51) to the yoke (11). The second MOSFET (Q47) is gated "ON" by a circuit which includes a third MOSFET (Q57) and a pulse transformer (T59).Advantages include an ability to rapidly effect flyback without interfering with the forward scanning ability of the deflection drive circuit 15.
    Type: Grant
    Filed: June 17, 1985
    Date of Patent: June 30, 1987
    Assignee: Allied Corporation
    Inventors: Jacob Sibovits, I. Phillip Jenkins
  • Patent number: 4612484
    Abstract: A line scanning circuit for an electrostatically deflected cathode ray tube uses two integrator circuits having single transistor amplifiers for complementary conductivity types with capacitive feedback to provide balanced sawtooth drive waveforms. The charges on the capacitors are reset by pulses at line frequency and the forward sweeps of the sawteeth are produced by current flowing from the input of one integrator to the input of the other integrator. A variable resistor in the current path provides width control and a transistor connected in series with the current path enables dynamic adjustment of the scan to be provided to suit the scanning characteristics of a flat cathode ray tube. A signal from the field scanning circuit during flyback is applied to turn off the transistor in the current path so that the spot is returned during field flyback up one side of the screen.
    Type: Grant
    Filed: September 13, 1984
    Date of Patent: September 16, 1986
    Assignee: Sinclair Research Limited
    Inventors: James S. Westwood, Peter H. Maydew
  • Patent number: 4385263
    Abstract: A primary winding of a power transformer is coupled to a source of DC voltage. First and second controllable switches are coupled to the primary winding in a push-pull arrangement. A control circuit responsive to a deflection rate input signal that is synchronized with deflection circuit scanning applies a turn-off switching signal alternately to the two controllable switches during each deflection cycle. In response to the turnoff of each one of the two controllable switches, a turn-on switching signal is applied to the other switch to develop a deflection rate alternating polarity output voltage across an output winding of the power transformer. The output voltage is rectified and applied to a deflection generator to thereby energize the generator into developing scanning current in a deflection winding.
    Type: Grant
    Filed: August 4, 1980
    Date of Patent: May 24, 1983
    Assignee: RCA Corporation
    Inventors: David W. Luz, Donald H. Willis
  • Patent number: 4224556
    Abstract: A drive circuit for an electrostatic deflection type cathode-ray tube where the drive circuit includes an amplifier and a load. At least one diode is connected between the output of the amplifier and the load and at least one push-pull emitter follower circuit is provided, the bases of whose transistors are connected to opposite terminals of the diode, the cathode-ray tube being deflected by the output of the push-pull emitter follower circuit.
    Type: Grant
    Filed: February 12, 1979
    Date of Patent: September 23, 1980
    Assignee: Trio Kabushiki Kaisha
    Inventor: Yasuhiko Muto
  • Patent number: 4188567
    Abstract: A vertical amplifier provides a deflection or yoke current independent of the yoke impedance or other impedances in the yoke current path. The amplifier comprises a general-purpose operatonal amplifier that develops an output voltage in a manner that maintains identical voltages at its inverting and non-inverting inputs. A feedback resistance is connected in the yoke current path, thereby developing a voltage indicative of the yoke current. As a result, the yoke current waveform can be made identical to or a desired variation of a current commanding voltage waveform applied to the non-inverting input. A particular variation of the feedback resistance transforms an S-shaped current waveform into a sawtooth voltage waveform, thereby providing the desired deflection linearity.
    Type: Grant
    Filed: October 3, 1977
    Date of Patent: February 12, 1980
    Assignee: GTE Sylvania Incorporated
    Inventor: Tex K. Monroe
  • Patent number: 3979641
    Abstract: A vertical deflection output circuitry for a television receiver wherein two transistors are connected in single ended and push-pull relation, and the output junction point of the two transistors is connected, to a D.C. power source for supplying a higher voltage than that of a power source for the vertical deflection output circuitry, through a switch which is turned off during the vertical scan period and turned on during the vertical retrace period.
    Type: Grant
    Filed: May 28, 1974
    Date of Patent: September 7, 1976
    Assignee: Hitachi, Ltd.
    Inventors: Yoshihiro Arakawa, Akio Nakashima, Shunji Iwabuchi, Kenji Ando
  • Patent number: 3969653
    Abstract: A deflection circuit for a television receiver is made more suitable for single chip integrated circuit construction by utilizing a switching means connected between a part of the transistor amplifier used to amplify a saw-tooth wave form and a power source. This permits a part of the energy stored in the deflection coil to be released through the amplifier during retrace intervals.
    Type: Grant
    Filed: December 24, 1974
    Date of Patent: July 13, 1976
    Assignee: Nippon Electric Company, Ltd.
    Inventor: Hirokazu Fukaya