Single-ended, Self-oscillating Type Patents (Class 363/18)
  • Patent number: 4471327
    Abstract: A self-oscillating circuit particularly adapted for driving the deflection yoke of a cathode ray tube (CRT) or a high voltage pulse transformer is disclosed. The circuit includes an NPN transistor, to the collector of which is coupled a direct voltage source and a first inductance and to the base of which is coupled a second, grounded inductance. Following transistor turn-on, the collector current ramps up in storing energy in the first inductance. With the transistor base drive removed, a voltage spike appears on the transistor's collector to which is coupled a grounded capacitor. The LC network comprised of the first inductance and the grounded capacitance attempts to resonate, with the collector voltage clamped by the transistor collector-base junction.
    Type: Grant
    Filed: May 20, 1982
    Date of Patent: September 11, 1984
    Assignee: Zenith Electronics Corporation
    Inventor: Timothy B. Moss
  • Patent number: 4394719
    Abstract: A DC to DC flyback converter for charging a capacitor in which the maximum current supplied from a battery to the converter's transformer is determined solely by the battery recovery voltage, circuit resistances, the transformer turns ratio and semiconductor junction voltages.
    Type: Grant
    Filed: December 11, 1981
    Date of Patent: July 19, 1983
    Assignee: Eastman Kodak Company
    Inventor: Gregory O. Moberg
  • Patent number: 4385347
    Abstract: This invention concerns a power supply arrangement which comprises a direct current power source circuit (A) including a battery (10), a voltage converter circuit (B) including an oscillator circuit (OC), an oscillating transformer (11) and an oscillation starting circuit (OS), a rectifier circuit (C) for rectifying said alternating current voltage to a direct current, and an oscillation stopping means (F) for stopping the current supplied from said battery to a load circuit member (D). The oscillator circuit (OC) includes an oscillating switching element (12) which has a high leak resistance, and the oscillation starting circuit includes a switch element (15) for starting the actuation of said voltage converter.
    Type: Grant
    Filed: August 6, 1980
    Date of Patent: May 24, 1983
    Inventor: Yoshiyuki Takematsu
  • Patent number: 4333139
    Abstract: Static inverter comprises a transformer and transistor for intermittent asymmetric energization of the transformer. The transformer includes three feedback windings which in response to saturation of a branch of the transformer core but before full core saturation discontinue regenerative feedback and then apply degenerative feedback. A fourth feedback winding in the transformer assures commutation and re-triggering of the transistor.
    Type: Grant
    Filed: November 14, 1980
    Date of Patent: June 1, 1982
    Assignee: General Electric Company
    Inventors: Daniel V. Owen, Alan M. Smith
  • Patent number: 4322724
    Abstract: An electronic device comprises an arrangement which makes it possible to power a transmitter in self-contained fashion from a pick-up without any other power source. The device comprises at least one transistor and a transformer having a high turns ratio. The primary windings are connected in series with controlled electrodes of the transistor. The secondary windings of the transformer act on the controlling electrode of the transistor and the very low voltage is applied across the primary windings and the controlled electrodes. Voltages of a few mV which are thus applied result in the appearance of voltage pulses of a usable magnitude at the terminals of the secondary winding which may be accumulated in a capacitor to feed the transmitter intermittently. This device can be used in a self-contained detector-transmitter for use as a remote fire alarm.
    Type: Grant
    Filed: June 25, 1980
    Date of Patent: March 30, 1982
    Assignee: Jocelyne Payot
    Inventor: Richard Grudzinski
  • Patent number: 4306281
    Abstract: In a DC-DC converter for an electronic flash unit disclosed, an npn transistor is used as an oscillating transistor. The emitter of the npn transistor is connected to a main capacitor of the flash unit at least through a secondary winding of the converter. A diode is connected between the secondary winding and the main capacitor in such a manner that the emitter current of the npn transistor can flow into the main capacitor as an charging current through the secondary winding.
    Type: Grant
    Filed: October 3, 1980
    Date of Patent: December 15, 1981
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tadashi Okino
  • Patent number: 4274044
    Abstract: A DC-DC converter is described of the blocking oscillator type, for charging a battery from a solar cell. The use of a field effect transistor enables the oscillation to be started by the voltage from a single solar cell, even if the battery is fully exhausted. The overall efficiency of the circuit is improved by the use of the base-emitter junction of the switching transistor of the converter as rectifying element for the battery charging current.
    Type: Grant
    Filed: June 4, 1979
    Date of Patent: June 16, 1981
    Assignee: U.S. Philips Corporation
    Inventor: Claude Barre
  • Patent number: 4264971
    Abstract: The converter device transforms a changing direct signal generated by a source of direct current, into a signal whose amplitude is substantially greater than that of said changing signal, at least for certain values of this signal. It comprises a first transistor, an inductance with a high overvoltage coefficient wound on a core of ferrite and arranged in the collector circuit of said first transistor, so that one terminal of this inductance is directly connected to the collector of said transistor, a second transistor of which the collector is directly connected to the base of the first transistor, a connecting capacitor between the collector of the first transistor and the base of the second transistor, and a polarizing resistance arranged between the base of the second transistor and one terminal of said source.
    Type: Grant
    Filed: October 26, 1973
    Date of Patent: April 28, 1981
    Assignee: Bicosa Societe de Recherches
    Inventor: Henri E. F. M. Courier de Mere
  • Patent number: 4260943
    Abstract: A high frequency battery charger operable from a 120 volt AC line power source which is rectified and converted by a blocking oscillator into 20-200 Khz rectified output for battery charging. A sensor for determining full battery charge serves as a power cut off to the battery with provision, if desired, for continued trickle charge of the battery.
    Type: Grant
    Filed: January 30, 1979
    Date of Patent: April 7, 1981
    Assignee: Unitron Corporation
    Inventors: Andrew Zaderej, George Zaderej
  • Patent number: 4257088
    Abstract: A simple single-ended inverter circuit efficiently converts a DC input voltage to an AC output voltage. The circuit, which functions as a self-contained Class C oscillator, comprises an energy-storing inductor and an energy-storing tank capacitor in circuit with a saturable core feedback transformer operable to provide intermittent feedback current to effect periodic conduction of a single power transistor. When this transistor is non-conductive, resonant interchange of energy occurs between the inductor and tank capacitor; periodic energy transfer from the inductor both charges the capacitor and also supplies a load, and energy transfer from the capacitor to the inductor provides reset current to the saturable transformer.
    Type: Grant
    Filed: April 25, 1979
    Date of Patent: March 17, 1981
    Inventor: Ole K. Nilssen
  • Patent number: 4251753
    Abstract: A power supply circuit for strobo unit includes a DC-DC converter which steps up a low voltage from a d.c. source to a higher voltage. The converter comprises an oscillation transformer, a PNP transistor and an NPN transistor, both of which are used to form an oscillation circuit. The circuit arrangement provides a stabilized oscillation and eliminates the likelihood of producing an electric shock.
    Type: Grant
    Filed: April 5, 1979
    Date of Patent: February 17, 1981
    Assignee: Olympus Optical Co., Ltd.
    Inventor: Isao Kondo
  • Patent number: 4202031
    Abstract: A static inverter employing an inductor and an electrical gain element for intermittent assymetric energization of the inductor from a dc source is described. Reliable intermittent operation of the gain element, typically a power transistor, is achieved by use of three feedback windings which in response to saturation of a branch of the core of the inductor but before full core saturation, discontinue regenerative feedback and then apply degenerative feedback. This turn off mechanism protects the transistor from high current stresses. Passive means are provided such as a capacitor for momentarily storing the energy or diode means for coupling the energy back to the source or to the load to protect the transistor from the high voltage surge and the energy release when current flow in the inductor is interrupted. Energy stored in the capacitor may be used for transistor commutation.
    Type: Grant
    Filed: November 1, 1978
    Date of Patent: May 6, 1980
    Assignee: General Electric Company
    Inventors: Joseph P. Hesler, Samuel M. Korzekwa, Robert J. McFadyen
  • Patent number: 4183080
    Abstract: A blocking oscillator DC to DC converter includes a first transformer which is charged up and provides feedback to a switching transistor on one half of the cycle and discharges stored energy from the secondary during the second half of the cycle. To reduce switching losses the first transformer driven switching transistor is turned off by a control transistor disposed between the switching transistor base and ground, the control transistor being turned on and off according to the charge on a base capacitor charged by the first transformer. A second transformer may be included to control the power across a gap disposed to kill flying insects.
    Type: Grant
    Filed: June 21, 1978
    Date of Patent: January 8, 1980
    Inventor: Theodore Liebman
  • Patent number: 4167036
    Abstract: A DC voltage converter includes an oscillator that converts a DC battery voltage to an oscillating voltage, a low voltage transformer that increases the oscillating voltage to a higher oscillating voltage, and a voltage rectifying-capacitor charging network or multiplier that increases the higher oscillating voltage to yet a higher DC voltage at an output terminal for DC high voltage utilization devices and the like. An electric control switch is selectively actuated by the user to apply the battery voltage to the oscillator, resulting in the generation of the stepped-up DC voltage at an output terminal. Another DC voltage converter has an electronic switching circuit that automatically turns the oscillator on and off and a load capacitor across the electrodes that is charged and discharged to provide a shocking voltage. Utilization devices for the voltage developed by the converter shown are a miniature animal training device and a cattle prod device.
    Type: Grant
    Filed: August 10, 1977
    Date of Patent: September 4, 1979
    Assignee: U and I, Ltd.
    Inventor: Frank M. Kenney
  • Patent number: 4121115
    Abstract: A power pack for a d.c. energized device, the power pack providing a predetermined d.c. voltage and being of given shape and dimensions, its output terminals having predetermined positions. This power pack includes a casing having the given external shape and dimensions and two output terminals in said predetermined positions. Inside the casing a d.c. power supply is provided adapted to deliver an on-load d.c. voltage lower than the said predetermined d.c. voltage, and a low consumption converter circuit for converting a signal from the d.c. power supply into a d.c. voltage signal of the predetermined value. The signal from the converter circuit is applied across the output terminals.
    Type: Grant
    Filed: December 15, 1976
    Date of Patent: October 17, 1978
    Assignee: Bicosa Societe de Recherches
    Inventor: Henri Courier de Mere
  • Patent number: 4092709
    Abstract: A multiple output switching regulator power supply operates as a self-oscillating circuit with a light weight ferrite core transformer and a sense winding used exclusively for voltage regulation purposes. A power transistor switch is employed to selectively connect the transformer primary across a DC source of power to provide energy storage when the switch is closed and to provide energy transfer when the switch is open, by way of transformer flyback. The power transistor switch is controlled by a feedback circuit which includes a current sink connected to selectively divert current away from the base of the power transistor switch and a timing circuit for controlling the operation of the current sink. A capacitor, connected across the sense winding is monitored by a high gain voltage comparison circuit which activates the timing circuit in dependence on the voltage variation on the capacitor.
    Type: Grant
    Filed: September 24, 1976
    Date of Patent: May 30, 1978
    Assignee: Texas Instruments Incorporated
    Inventors: William C. Voigt, William F. Jergens
  • Patent number: 4084218
    Abstract: A DC voltage converter includes an oscillator that converts a DC battery voltage to an oscillating voltage, a low voltage transformer that increases the oscillating voltage to a higher oscillating voltage, and a voltage rectifying-capacitor charging network that increases the higher oscillating voltage to yet a higher DC voltage at an output terminal for DC high voltage utilization devices and the like. An electric switch portion is selectively actuated by the user to apply the battery voltage to the oscillator, resulting in the generation of the stepped-up DC voltage at the output terminal. Utilization devices for the voltage developed by the converter shown are a miniature animal training device and a cattle prod device. The miniature animal training device has a pair of outwardly projecting electrodes mounted on a side at one end of the housing that is sized and shaped to fit within and conform to the palm of a hand.
    Type: Grant
    Filed: January 13, 1976
    Date of Patent: April 11, 1978
    Assignee: U and I Company
    Inventor: Frank M. Kenney
  • Patent number: 4039927
    Abstract: The invention relates to a power supply circuit utilizing a DC input tied to the primary windings of two transformers. A pulse source drives either primary through a selector switch which selects the desired primary to produce a pulsed transformer output of desired polarity. The transformer secondary windings produce a voltage output discharged by a load supplying capacitor. The voltage output is maintained at a desired polarity and at a peak level by periodically pulsing the load supplying capacitor with the same amount of energy taken by the load.
    Type: Grant
    Filed: January 12, 1976
    Date of Patent: August 2, 1977
    Assignee: AMP Incorporated
    Inventors: George Gilman Richards, Jr., John Gilbert Berger