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Inventor:
Wei; Lixiang
Address:
Whitefish Bay, WI
No. of patents:
22
Patents:












Patent Number Title Of Patent Date Issued
8570775 CMV reduction under bus transient condition October 29, 2013
Power conversion systems and control techniques are presented in which a bus transient control component bypasses selected phases of a rectifier during a protective mode of operation to reduce common mode voltages or currents.
8570003 Double fed induction generator converter and method for suppressing transient in deactivation of October 29, 2013
A double fed induction generator (DFIG) system and controller are presented in which the rotor side converter is preloaded with one or more initial values for resuming regulated operation to counteract transients upon deactivation of the crowbar protection circuit to provide grid fault
8243481 Power transformer and power converter incorporating same August 14, 2012
Techniques for using multiple 18-pulse rectifier circuits in parallel are described herein. In particular, each rectifier circuit may include an autotransformer having 15 inductors coupled in series, joined by 15 nodes interposed between pairs of the inductors. The inductors may be r
8233258 DC bus clamp circuit to prevent over voltage failure of adjustable speed drives July 31, 2012
The present invention relates to a protective circuit to provide over voltage protection for an ASD. The protective circuit provides the benefits of fewer components with lower power ratings than existing protective circuits. The protective circuit may be incorporated directly in the
8188693 DC bus boost method and system for regenerative brake May 29, 2012
Embodiments of the present invention provide novel techniques for using a switched converter to provide for three-phase alternating current (AC) rectification, regenerative braking, and direct current (DC) voltage boosting. In particular, one of the three legs of the switched converter
8148929 Power electronic module IGBT protection method and system April 3, 2012
A power electronics device with an improved IGBT protection mechanism is provided. More specifically, systems and methods are provided for reducing the switching frequency of an inverter module based on the junction temperature variation of the IGBT.
8125304 Power electronic module with an improved choke and methods of making same February 28, 2012
An improved choke assembly for a power electronics device is provided. More specifically, a choke assembly with improved protection from environmental conditions such as dirt and water is provided. An improved choke assembly may include an insulative housing for an inductor coil that
8117008 Junction temperature prediction method and apparatus for use in a power conversion module February 14, 2012
A method and apparatus for predicting junction device temperature of at least a first switching device in a power conversion module that includes the first switching device and at least a second switching device, the method comprising the steps of identifying a cross thermal impedance
8086420 Junction temperature prediction method and apparatus for use in a power conversion module December 27, 2011
A method and apparatus for predicting junction device temperature of at least a first switching device in a power conversion module that includes a plurality of switching devices, the method comprising the steps of, during switching activity, identifying at least one operating charac
7906922 Electric motor drive employing hybrid, hysteretic/pulse-width-modulated dynamic braking March 15, 2011
A dynamic braking circuit for an electronic motor drive shunts the DC link of the drive with a resistor using two control strategies. The first control strategy used for lower levels of braking employs a pulse width modulated signal and the second control strategy used for higher levels
7830036 Power electronic module pre-charge system and method November 9, 2010
A power electronics device with an improved pre-charge circuit configuration is provided. More specifically, the input of the motor drive module may accept an AC or DC source voltage. In this way, the pre-charge circuit of the motor drive module may be utilized whether the motor driv
7826985 Power module life estimation fatigue function November 2, 2010
A system and method for estimating a condition of a power module is provided. In accordance with an embodiment, a motor controller may be maintained by tracking a total proportion of power module life expended by a power module in a variable frequency motor controller based on a mini
7825621 Junction temperature reduction for three phase inverters modules November 2, 2010
Provided is a motor controller and method of controlling a motor with an improved maximum junction temperature rating. In accordance with one aspect of the present invention, a motor is controlled by varying a common mode voltage duty ratio for a plurality of solid state switching de
7728544 System and method for controlling input line harmonics in a motor drive June 1, 2010
A motor drive system is disclosed that includes a power input configured to receive alternating current (AC) power and a rectifier having a switching frequency selected to convert the AC power to direct current (DC) power. The motor drive unit also includes an input filter circuit co
7602622 Compensator with filter for use with a three-phase drive powering a one-phase load October 13, 2009
The present invention is directed to a compensator-filter circuit for reducing low order current harmonics in a three-phase drive system driving a single-phase load, the three-phase drive system including a three-phase source voltage connected to a rectifier system connected to a DC
7535738 Method and apparatus including multi-drive configurations for medium voltage loads May 19, 2009
A method and apparatus for converting X phase intermediate voltages on X intermediate lines to output voltage for driving a single three phase load, the apparatus comprising a positive DC bus, a negative DC bus and first and second three phase drives that each include a rectifier section
7518891 Auxiliary circuit for use with three-phase drive with current source inverter powering a single- April 14, 2009
An auxiliary circuit for reducing low order current harmonics in a three-phase drive system driving a single-phase load, the three-phase drive system including a three-phase source voltage connected to a rectifier system connected to a DC link choke inductor connected to a three-phas
7502238 Rectifier for reducing current harmonics from unbalanced source March 10, 2009
A rectifier includes a transformer, a rectifying bridge, a link capacitor, and at least a first resonance loop. The transformer is operable to receive three phase input signals having a source frequency and generate a plurality of transformer phase signals. The rectifying bridge has a
7477531 Compensation circuit for use with a three-phase drive powering a single-phase load January 13, 2009
A compensator circuit for reducing low order current harmonics in a three-phase drive system driving a single-phase load, the three-phase drive system including a three-phase source voltage connected to a rectifier system connected to a DC link capacitor connected to a three-phase vo
7356441 Junction temperature prediction method and apparatus for use in a power conversion module April 8, 2008
A method and apparatus for predicting junction device temperature of at least a first switching device in a power conversion module that includes the first switching device and at least a second switching device, the method comprising the steps of identifying a cross thermal impedance
7190143 Pulse width modulation (PWM) rectifier with variable switching frequency March 13, 2007
A method for controlling a device including a plurality of switching devices operated in accordance with a pulse width modulation technique includes receiving a reference voltage signal associated with a first pair of the switching devices. A switching signal is generated. The first
6995992 Dual bridge matrix converter February 7, 2006
A dual bridge matrix converter has a line-side converter with controllable switches that receives AC power and provides unidirectional power to high and low DC link lines, and a load-side converter which receives the power from the DC link lines and provides AC power to output lines. A c










 
 
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