Patents by Inventor Ronald A. Lesea

Ronald A. Lesea has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7859194
    Abstract: A short arc lamp driving circuit includes a trigger boosting circuit, a flash current control circuit, and a closed loop exposure control and calibration circuits that, when combined, can produce short pulses of light with short time separation, quasi-continuous illumination light, and meanwhile, an extremely large dynamic range of delivered and/or calibrated light power or energy.
    Type: Grant
    Filed: October 30, 2006
    Date of Patent: December 28, 2010
    Inventors: Jerry Walker, Arie Ravid, Wei Su, Ronald A. Lesea, Deanna Y. Lesea, legal representative
  • Publication number: 20080211420
    Abstract: A short arc lamp driving circuit includes a trigger boosting circuit, a flash current control circuit, and a closed loop exposure control and calibration circuits that, when combined, can produce short pulses of light with short time separation, quasi-continuous illumination light, and meanwhile, an extremely large dynamic range of delivered and/or calibrated light power or energy.
    Type: Application
    Filed: October 30, 2006
    Publication date: September 4, 2008
    Inventors: Jerry Walker, Arie Ravid, Wei Su, Ronald A. Lesea, Deanna Y. Lesea
  • Publication number: 20050047179
    Abstract: A power supply samples a rectified AC-input waveform and a regulated output voltage and combines them to control an AC-to-DC converter. The operating frequency and/or pulse width modulation of a switched-mode power supply are in large part fixed by a highly filtered output feedback signal to maintain a desired output voltage. A sample taken from the AC-input rectifiers is used in another feedback control signal to drive the operating frequency and/or pulse width modulation slightly up and down as a function of the rise and fall of each rectified-waveform sinusoid. The power delivered to the output, and thus the power demand on the input rise and fall with the instantaneous voltage of the AC input sinusoid. So the power factor is controlled by drawing current in-step with the voltage waveform.
    Type: Application
    Filed: August 27, 2003
    Publication date: March 3, 2005
    Inventor: Ronald Lesea
  • Patent number: 6465990
    Abstract: A Parallel Charge, Series Discharge method and apparatus for power factor correction and improved efficiency comprising an energy source, two (or more) impedance(s) capable of storing and delivering electrical energy, a switching circuit having one position so that inpedance(s) charge in a parallel mode with a fraction of the electrical energy incoming from one (or more) rectified AC input generator(s), and another position so that inpedance(s) discharge some of the electrical energy stored into the load, the switch having a frequency and duty cycle so that the input current rectified waveform from the energy source will approximate the voltage rectified waveform from the energy source.
    Type: Grant
    Filed: March 15, 2001
    Date of Patent: October 15, 2002
    Assignee: Bensys Corporation
    Inventors: Beniamin Acatrinei, Ronald A. Lesea
  • Publication number: 20020130640
    Abstract: A Parallel Charge, Series Discharge method and apparatus for power factor correction and improved efficiency comprising an energy source, two (or more) impedance(s) capable of storing and delivering electrical energy, a switching circuit having one position so that inpedance(s) charge in a parallel mode with a fraction of the electrical energy incoming from one (or more) rectified AC input generator(s), and another position so that inpedance(s) discharge some of the electrical energy stored into the load, the switch having a frequency and duty cycle so that the input current rectified waveform from the energy source will approximate the voltage rectified waveform from the energy source.
    Type: Application
    Filed: March 15, 2001
    Publication date: September 19, 2002
    Inventors: Beniamin Acatrinei, Ronald A. Lesea
  • Patent number: 5949196
    Abstract: An arrangement for switchably operating one or more gas discharge lamps, such a compact or circline fluorescent lamps, with a single ballast commonly used with a linear fluorescent lamp. One or more capacitors is either in parallel or in series with the gas discharge lamp. When engaged by a switch, the capacitor either shunts or reduces the current to the gas discharge lamp in a manner which allows appropriate starting voltage, appropriate operating current and a plurality of illumination levels of the gas discharge lamp.
    Type: Grant
    Filed: March 13, 1997
    Date of Patent: September 7, 1999
    Assignee: Lumatech Corporation
    Inventors: Ronald A. Lesea, Bruce A. Pelton
  • Patent number: 5757630
    Abstract: The present invention is directed to providing a load control circuit for non-linear or negative-resistance loads, such as gaseous-discharge lamps, having improved cost-effective control and control. In accordance with exemplary embodiments, a controlled start feature is provided which is relatively cost-effective to implement and manufacture. Further, by reducing the complexity and costs associated with such functionality, additional functionality can be provided without substantially increasing the cost of the control circuit.
    Type: Grant
    Filed: September 5, 1995
    Date of Patent: May 26, 1998
    Assignee: Electronic Lighting, Inc.
    Inventor: Ronald A. Lesea
  • Patent number: 5635825
    Abstract: An improved power factor DC power supply in accordance with the present invention (100 or 200) employs a power factor correcting network (120), a full-wave rectifier means (122), a pair of filter capacitors (124 and 126), and three current steering diodes (128, 130 and 132). The power factor correcting network (120) includes both an inductor means (136 and 240) and a capacitor (138), the combination configured to improve the power factor DC power supply (100 or 200) presents to the AC power-line (102) by reducing the level of harmonic currents the DC power supply generates on the AC power-line. The filter capacitors (124 and 126) are configured with the current steering diodes (128, 130 and 132) such that the filter capacitors are charged in series and discharged in parallel.
    Type: Grant
    Filed: September 2, 1994
    Date of Patent: June 3, 1997
    Assignee: Electronic Lighting, Inc.
    Inventor: Ronald A. Lesea
  • Patent number: 5477112
    Abstract: Briefly, to reduce switching stresses, employed is a high-frequency AC power source (110) and a current-limiting (ballasting) network (116). The network ( 116 ) includes a high-frequency trap ( 120 ) and an impedance transforming network (122), which is coupled to the AC power source (110) by the trap (120) and which is for connection to a load that includes at least one gaseous discharge (fluorescent) lamp or other non-linear or negative-resistance load (102). The trap, which has the parallel resonant combination of an inductor ( 130 ) and a capacitor ( 132 ), is resonant at a frequency chosen such that the switching-circuit transistor(s) (210, or 230 and 232, or 250 and 252, or 270 and 272, or 708) of the AC power source (110) switch at times when the level of the current (charge flowing) therein and/or the voltage developed there across is zero, preferably, at a frequency slightly higher than a harmonic frequency of the high-frequency AC power source ( 110 ).
    Type: Grant
    Filed: April 27, 1993
    Date of Patent: December 19, 1995
    Assignee: Electronic Lighting, Inc.
    Inventor: Ronald A. Lesea
  • Patent number: 5345164
    Abstract: An improved power factor DC power supply in accordance with the present invention (100 or 200) employs a power factor correcting network ( 120), a full-wave rectifier means (122), a pair of filter capacitors (124 and 126 ) , and three current steering diodes (128, 130 and 132). The power factor correcting network ( 120) includes both an inductor means (136 and 240) and a capacitor (138), the combination configured to improve the power factor DC power supply (100 or 200) presents to the AC power-line (102) by reducing the level of harmonic currents the DC power supply generates on the AC power-line. The filter capacitors (124 and 126) are configured with the current steering diodes (128, 130 and 132) such that the filter capacitors are charged in series and discharged in parallel.
    Type: Grant
    Filed: April 27, 1993
    Date of Patent: September 6, 1994
    Assignee: Metcal, Inc.
    Inventor: Ronald A. Lesea
  • Patent number: 5315214
    Abstract: An embodiment of the present invention is a dimmable, high power factor, high efficiency electronic ballast comprising, on a single integrated circuit chip, a shunt regulator, a voltage reference, a high-temperature shutdown, an undervoltage lockout, a timer for start-up and restarting, a variable oscillator, a mode control, an op-amp for receiving a signal proportional to lamp current and for controlling the variable oscillator or the duty-cycle of pulses output in a closed-loop servo, and active power factor correction including an analog multiplier for receiving an AC voltage and an AC current sample, and for multiplying these together to result in a comparison with a DC voltage. The comparison produces a control signal for a MOSFET switch on a boost converter transformer that actively corrects the power factor at a rate set by the oscillator.
    Type: Grant
    Filed: June 10, 1992
    Date of Patent: May 24, 1994
    Assignee: Metcal, Inc.
    Inventor: Ronald A. Lesea
  • Patent number: 5315215
    Abstract: A pair of transistors (110 and 112) configured with their channels connected in series. The gate of the "upper" transistor (110) is coupled to a relatively low-voltage, DC power supply voltage by a voltage-clamping and current-steering diode (144); to a relatively high-voltage, DC power supply voltage by the series combination of a current-steering diode (152) and one voltage-clamping zener diode (154 and 156) and coupled to the source of the "upper" transistor by a charge-removing resistor (162).
    Type: Grant
    Filed: April 27, 1993
    Date of Patent: May 24, 1994
    Assignee: METCAL, Inc.
    Inventor: Ronald A. Lesea
  • Patent number: 5175475
    Abstract: For coupling one, or more, gaseous discharge lamps to a high-frequency AC power-source a ballasting (current-limiting) network employs a first capacitor, a second inductor, and a transformer having a primary winding coupled to the high-frequency AC power-source by the first capacitor and a secondary winding coupled to the gaseous discharge lamp by the second inductor.
    Type: Grant
    Filed: December 4, 1991
    Date of Patent: December 29, 1992
    Assignee: GTE Products Corporation
    Inventors: Ronald A. Lesea, John B. Sampson
  • Patent number: 5101140
    Abstract: For coupling one, or more, gaseous discharge lamps to a high-frequency AC power-source a ballasting (current-limiting) network employs a first capacitor, a second capacitor, and a transformer having a primary winding coupled to the high-frequency AC power-source by the first capacitor and a secondary winding coupled to the gaseous discharge lamp by the second capacitor.
    Type: Grant
    Filed: May 15, 1991
    Date of Patent: March 31, 1992
    Assignee: GTE Products Corporation
    Inventors: Ronald A. Lesea, John B. Sampson
  • Patent number: 5047691
    Abstract: For coupling one, or more, gaseous discharge lamps to a high-frequency AC power-source a ballasting (current-capacitor, and a transformer having a primary winding coupled to the high-frequency AC power-source by the first capacitor and a secondary winding coupled to the gaseous discharge lamp by the second capacitor.
    Type: Grant
    Filed: November 29, 1989
    Date of Patent: September 10, 1991
    Assignee: GTE Products Corporation
    Inventors: Ronald A. Lesea, John B. Sampson
  • Patent number: 5028846
    Abstract: A single-ended ballast circuit employs a power-factor-correcting network (510); a DC power supply (512); a free-running oscillator (516); a transistor (518); a current-limiting (ballasting) network (520); and two fluorescent lamps (524). The transistor (518) is configured as a switch connected to be responsive to a signal generated (630) by the oscillator (516) and operative to periodically couple a line (734) to a circuit common. The current-limiting (ballasting) network (520) includes an inductor or transformer (740) having a primary winding (744), connected between a DC power-supply potential and the line (734), and a secondary winding (746); a first capacitor (750), connected between the line (734) and circuit common; an inductor (752); a second capacitor (756), connected in series with the inductor (752) across the secondary winding (746); and a third capacitor (754), connected in series with the lamps (524) across the second capacitor (756).
    Type: Grant
    Filed: June 20, 1990
    Date of Patent: July 2, 1991
    Assignee: GTE Products Corporation
    Inventor: Ronald A. Lesea
  • Patent number: 5021716
    Abstract: A forward inverter ballast circuit employs a free-running oscillator (116); a transistor (118); a current-limiting (ballasting) network (120); and two fluorescent lamps (128). The transistor (118) is configured as a switch connected to be responsive to a signal generated (200) by the oscillator (116) and operative to periodically couple a line (234) to a circuit common. The current-limiting network (120) includes a diode (250) and a transformer (240) having a transformer primary winding (244) connected between a DC power-supply potential and the line (234); a first, tightly-coupled, transformer secondary winding (246) connected between the DC power-supply potential and the circuit common; and a second transformer secondary winding (248). In addition, the current-limiting network (120) includes an inductor (252), a capacitor (254), and another capacitor (256), all connected in series across the second transformer secondary winding (248). The lamps (128) are connected across one of the capacitors (256).
    Type: Grant
    Filed: May 18, 1990
    Date of Patent: June 4, 1991
    Assignee: GTE Products Corporation
    Inventor: Ronald A. Lesea
  • Patent number: 4672522
    Abstract: An electronic ballast for energizing one or more gaseous-discharge lamps and for regulating the power consumed thereby, the ballast including a power supply for providing a source of DC power between a pair of outputs, a pair of transistors connected as switches in series between the power-supply outputs, the transistors for selectively coupling to the juncture thereof positive and negative potentials, a voltage-conditioning and current-limiting network for energizing the lamp from the potential developed between the transistor juncture and a power-supply common, and a pulse generator for developing pulses for driving each of the transistors in turn whereby a potential is developed at the transistor juncture which alternates as positive-going and negative-going pulses each separated by a dead time, the pulse generator for monitoring the power consumption level of the lamp and responsive thereto operative to vary the frequency and/or the width of the transistor driving pulses whereby the lamp consumption is re
    Type: Grant
    Filed: July 9, 1984
    Date of Patent: June 9, 1987
    Assignee: XO Industries, Inc.
    Inventor: Ronald A. Lesea
  • Patent number: 4415839
    Abstract: An electronic ballast for energizing one or more gaseous-discharge lamps and for regulating the power consumed thereby, the ballast including a power supply for providing a source of DC power between a pair of outputs, a pair of transistors connected as switches in series between the power-supply outputs, the transistors for selectively coupling to the juncture thereof positive and negative potentials, a voltage-conditioning and current-limiting network for energizing the lamp from the potential developed between the transistor juncture and a power-supply common, and a pulse generator for developing pulses for driving each of the transistors in turn whereby a potential is developed at the transistor juncture which alternates as positive-going and negative-going pulses each separated by a dead time, the pulse generator for monitoring the power consumption level of the lamp and responsive thereto operative to vary the frequency and/or the width of the transistor driving pulses whereby the lamp consumption is re
    Type: Grant
    Filed: November 23, 1981
    Date of Patent: November 15, 1983
    Inventor: Ronald A. Lesea
  • Patent number: 4256928
    Abstract: A telephone call diverting and answering system. The system includes a telephone call concentrator for diverting a telephone call placed at a telephone set at one of a number of calling stations, from a telephone line connected to the intended telephone set, at one of a large number of called stations, to one of a small number of telephone trunks leading to sets at a number of answering stations. The system further includes an operator console at each answering station, and a traffic director for assigning the call to a particular station by causing the identity of the called station and the number of the diverting trunk to be displayed on the operator console of the assigned answering station.
    Type: Grant
    Filed: September 28, 1979
    Date of Patent: March 17, 1981
    Assignee: Durango Systems, Inc.
    Inventors: Ronald A. Lesea, Barrie Luttge, Austin H. Lesea