Power Electronics

Patents | October 2009

REGULATING WIND-TURBINE ROTOR ROTATIONAL SPEED

Issued September 8, 2009

United States Patent 7,586,205

A method and system for regulating the rotational speed of a rotor on a wind energy unit with a generator and a rotor blade., in which the first set parameter is a pitch angle of the rotor blade and the second set parameter is the torque of the generator. The system comprises a pitch-angle control or regulation device, a torque control or regulation device, a first device for determination of a first rotational speed set value and a second device for determination of a second rotational speed set value. The first rotational speed set value may be supplied to the pitch-angle control or regulation device and the second rotational speed set value may be supplied to the torque control or regulation device, wherein the first and second rotational speed set value may be different from each other.

Inventors: Krueger; Thomas (Westerroenfeld, DE)

Assignee: Repower Systems AG (Hamburg, DE)

Appl. No.: 11/960,150

Filed: December 19, 2007

HARDWARE-BASED CONFIGURABLE MOTION-CONTROL

Issued September 8, 2009

United States Patent 7,586,282

Apparatus for generating a motion-control algorithm to control an ac electric machine, comprising a motion-control engine with a motion-control sequencer, a motion-control program memory, a port memory, a plurality of motion-control modules, and a plurality of motion-peripheral modules; the motion-control sequencer executing a sequence of instructions stored in the motion-control program memory directing the sequencer to execute motion-control modules and motion-peripheral modules in a specified sequence and with a specified connection of module inputs and module outputs and operational parameters stored in the port memory to generate the motion-control algorithm.

Inventors: Takahashi; Toshio (Rancho Palos Verdes, CA), Banzhof; William (Alpine, CA), Lindstrom; Jean (Ramona, CA)

Assignee: International Rectifier Corporation (El Segundo, CA)

Appl. No.: 11/612,993

Filed: December 19, 2006

CURRENT SENSOR DEVICE

Issued September 8, 2009

United States Patent 7,586,367

A current sensor senses current at a sense transistor and generates an accurate proportional representation of that current. The sensed current is relatively independent of the resistive load of the feedback path at the feedback control module (FCM) to which it is applied. In one embodiment, the FCM uses the sensed current in a dc-dc voltage converter to regulate a voltage. The current sensor uses a pair of op-amps to match a voltage at a current electrode of a transistor that generates the output current to a voltage at a current electrode of the sense transistor, such that an effective resistance of the transistor generating the output current is significantly higher than the resistive load of the FCM, ensuring that the output current is relatively independent of the resistive load of the FCM.

Inventors: De Lima Filho; Jader Alves (Campinas, BR)

Assignee: Freescale Semiconductor, Inc. (Austin, TX)

Appl. No.: 11/739,933

Filed: April 25, 2007

LCO-BASED SMPS RESPONSE EVALUATION

Issued September 8, 2009

United States Patent 7,586,767

A limit-cycle-oscillation (LCO)-based SMPS response evaluation determines the characteristic response of an SMPS during normal operation. LCOs are induced in the SMPS loop by introducing a non-linearity in the loop; for example, decreasing the resolution of a pulse-width modulator that controls the SMPS switching circuit. The frequency and amplitude of the LCOs are determined and used to evaluate the characteristic response of the SMPS. To produce symmetric LCOs, which are more easily modeled, a zero-offset calibration circuit adjusts values provided to the pulse-width modulator so that each value introduced during calibration is at the midpoint of a resolution cell.

Inventors: Prodic; Aleksandar (Toronto, Ontario, CA), Zhao; Zhenyu (Toronto, Ontario, CA)

Appl. No.: 12/107,843

Filed: April 23, 2008

ELECTRICAL INSULATION SYSTEM AND METHOD

Issued September 8, 2009

United States Patent 7,586,736

An electrical insulation system and method for electrical power-storage component separation is disclosed. Some implementations of the system use various forms of polyurethane elastomer-based materials, such as tapes, to electrically separate various components of electrical power-storage devices such as battery packs. These components can include cells, connecting tabs, printed-circuit assemblies, solder joints, nickel strips, and other conductive members.

Inventors: Young; Charlie (Hillsboro, OR), Guzman; Ted (Gresham, OR)

Assignee: Micro Power Electronics Inc. (Hillsboro, OR)

Appl. No.: 11/420,708

Filed: May 26, 2006

ACTIVE FILTER FOR REDUCING COMMON-MODE CURRENT

Issued September 1, 2009

United States Patent 7,583,136

An active filter for reducing the common-mode current in a pulse-width-modulated drive circuit driving a load, said drive circuit comprising an ac source; a rectifier connected to said ac source and producing a rectified output voltage connected to a positive dc bus and a negative dc bus; a PWM inverter having input terminals coupled to said positive dc bus and negative dc bus and having a controlled ac output; a load driven by said ac output of said PWM inverter; a ground wire extending from said load; and a current sensor for measuring the common-mode current in said drive circuit.

Inventors: Pelly; Brian R. (Palos Verdes Estates, CA)

Assignee: International Rectifier Corporation (El Segundo, CA)

Appl. No.: 12/055,982

Filed: March 26, 2008

CORELESS CURRENT SENSOR

Issued September 1, 2009

United States Patent 7,583,073

Coreless current sensor comprises two parallel conductors carrying equal currents in the same direction. The magnetic field in mid-location of the two parallel conductors carrying equal currents in the same direction for all current magnitudes is zero in absence of an external magnetic interference. Sum of magnetic fields in two points equidistant from the mid location on both the sides is zero as magnetic fields at these points are equal in magnitude and opposite in polarity for all current magnitudes and for equal amount of current flowing through both conductors in the same direction in absence of an external magnetic interference. Two sensing elements can be arranged between the two parallel conductors for sensing the magnetic field due to currents flowing through them for the purpose of current measurement.

Inventors: Kumar; Sachin (Freeport, IL), Thotadakumbri; Raviprakash (Bangalore, IN), Reddy; Gangi Rajula (Bangalore, IN)

Assignee: Honeywell International Inc. (Morristown, NJ)

Appl. No.: 11/780,163

Filed: July 19, 2007

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