Patents by Inventor J. Ben Klaassens

J. Ben Klaassens 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).

  • Series resonant converter control system and method
    Patent number: 5270914
    Abstract: An apparatus and method is disclosed for an improved control system for a series resonant converter for transferring power between a source and a load. The control system comprises a series resonant circuit including a capacitor and an inductor with a first and second switching matrix connecting the series resonant circuit to the source and the load, respectively. A controller selects a combination of switches for transferring power between the source and the load using a single segment half-cycle resonant waveform that produces a final voltage on the capacitor within a preselected boundary.
    Type: Grant
    Filed: February 23, 1993
    Date of Patent: December 14, 1993
    Inventors: Hian K. Lauw, J. Ben Klaassens
  • Three-phase AC-to-AC series resonant power converter with reduced number of switches
    Patent number: 5010471
    Abstract: An apparatus and method is disclosed for an improved AC--AC series-resonant converters incorporating power pulse modulation with internal frequencies of tens of kHz is applied to a series-resonant converter system for generating synthesized multiphase bipolar waveforms with reversible power flow and low distortion. The high pulse frequency allows the application of the principle of modulation and demodulation for fast system response. Switches are required which have bidirectional current conduction and voltage blocking ability. The conventional series-resonant AC--AC converter applies a total of 24 anti-parallel thyristors. The circuit configuration of the present invention is a series-resonant AC--AC converter with only 12 thyristors. Use of the converter results in a higher efficiency and lower costs.
    Type: Grant
    Filed: June 26, 1989
    Date of Patent: April 23, 1991
    Assignee: Robert F. Frijouf
    Inventors: J. Ben Klaassens, Hian K. Lauw, Freddy de Beer
  • Control circuit for resonant converters
    Patent number: 4897775
    Abstract: An improved control circuits is disclosed for use with a resonant converter having a resonant circuit and a first and a second plurality of switches for transferring electrical power between first and second terminals. The improved control circuit comprises a power transfer control or an outer control loop and a resonant circuit control or an inner control loop with the resonant circuit control having a predictor circuit. The power transfer control regulates the electrical power transferred between the first and second terminals through selective conduction of the first and second plurality of switches for selectively initiating oscillation of the resonant circuit to provide resonant pulses of the resonant circuit.
    Type: Grant
    Filed: February 24, 1988
    Date of Patent: January 30, 1990
    Assignee: Robert F. Frijouf
    Inventor: J. Ben Klaassens