1
Hian K Lauw, Gerald C Alexander: Doubly fed generator variable speed generation control system. The State of Oregon acting by and through the State Board of Higher Education on behalf of Oregon State University, Klarquist Sparkman Campbell Leigh & Whinston, February 19, 1991: US04994684 (114 worldwide citation)

Disclosed is a device and method to control the conversion of an arbitrary resource energy into mechanical energy and subsequently into electric energy with a variable-speed generation system utilizing a turbine and a doubly-fed generator, to be connected directly to a power grid of a certain grid f ...


2
Hian K Lauw: Unipolar series resonant converter. Electronic Power Conditioning, Klarquist Sparkman Campbell Leigh & Whinston, May 2, 1995: US05412557 (69 worldwide citation)

A high efficiency static series resonant converter and method for converting power between two electric AC and/or DC circuits includes a resonant tank coupled to a link current synthesizer for generating a train of unipolar link current pulses with controllable duration zero and nonzero current segm ...


3
Hian K Lauw: Brushless doubly-fed generator control system. The State of Oregon acting by and through the State Board of Higher Education on behalf of Oregon State University, Klarquist Sparkman Campbell Leigh & Whinston, July 2, 1991: US05028804 (65 worldwide citation)

An energy conversion generation system receives energy from a resource and converts the energy into electrical power for supply to a polyphase electric power grid operating at a system frequency. A prime mover driven by the resource energy and a converter, such as a power electronic converter, for p ...


4
Hian K Lauw: Brushless doubly-fed motor control system. The State of Oregon Acting by and through the State Board of Higher Education on Behalf of Oregon State University, Klarquist Sparkman Campbell Leigh & Whinston, August 24, 1993: US05239251 (53 worldwide citation)

An AC variable speed drive (VSD) system having a brushless doubly-fed motor receives power from an electric power grid at a system frequency of the grid and drives a mechanical load. The motor has a rotor with rotor windings and a stator with stator windings comprising first and second polyphase sta ...


5
J Ben Klaassens, Hian K Lauw, Freddy de Beer: Three-phase AC-to-AC series resonant power converter with reduced number of switches. Robert F Frijouf, Frijouf Rust & Pyle, April 23, 1991: US05010471 (50 worldwide citation)

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 ...


6
Hian K Lauw: Power factor motor control system. State of Oregon acting by and through the State Board of Higher Education on behalf of Oregon State University, Klarquist Sparkman Campbell Leigh & Whinston, January 1, 1991: US04982147 (49 worldwide citation)

A device and associated method to control the electromechanical energy conversion process of a variable speed drive utilizing a doubly fed machine, which provides the mechanical energy as demanded by some mechanical load. Alternatively, a device and associated method is provided for a synchronous mo ...


7
Hian K Lauw, Robert S Zedwick: Voltage clamped parallel resonant converter with controllable duty cycle. Electronic Power Conditioning, Klarquist Sparkman Campbell Leigh & Whinston, September 24, 1996: US05559685 (40 worldwide citation)

A high efficiency static voltage clamped parallel resonant converter for converting power between two AC and/or DC circuits includes a link circuit between an input switch circuit and an output switch circuit. The link circuit comprises a parallel resonant circuit and link switch elements which are ...


8
Hian K Lauw, J Ben Klaassens: Series resonant converter control system and method. Frijouf Rust & Pyle, December 14, 1993: US05270914 (14 worldwide citation)

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 ...


9
Hian K Lauw: Unipolar series resonant converter. Electronic Power Conditioning, YU MENG, September 18, 1996: CN95102223

A high efficiency static series resonant converter and method for converting power between two electric AC and/or Dc circuits, includes a resonant tank coupled to a link current synthesizer for generating a train of unipolar link current pulses with controllable duration zero and nonzero current seg ...



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