Power Electronics

Recent U.S. Power Electronics Patents

More detailed information may be found at the Patent Office Web site: http://www.uspto.gov. Click on “Searchable Databases,” then “Patent Full-Text Database with Full-Page Images,” then “Patent Number Search.” Enter the patent number shown below, and then choose “Full-Text Search,” followed by “Images.”

Asymmetrical half-bridge power converter

6,188,586 February 13, 2001 This asymmetrical half-bridge power converter and method of manufacturing is one embodiment. The converter includes: first and second power switches configured to be controlled by complementary drive signals having nominal first- and second-duty cycles of D and 1-D, respectively; and first and second capacitors with intrinsic capacitance values proportional to 1-D and D, respectively, and intrinsic equivalent series resistance (ESR) values proportional to D and 1-D, configured to reduce input ripple current associated with the asymmetrical half-bridge power converter.

Inventors: Farrington; Richard (Rockwall, Texas); Jacobs; Mark E. (Dallas); Liu; Rui; Thottuvelil; Vijayan J. (Plano, Texas)

Assignee: Lucent Technologies, Inc. (Murray Hill, N.J.)

Normally conducting dual thyristor

6,188,267 February 13, 2001 This invention relates to a component forming a normally on dual thyristor, which can be turned off by a voltage pulse on the control electrode, including a thyristor, a first depletion MOS transistor (the gate of which is connected to the source, between the anode gate and the cathode of the thyristor), and a second enhancement MOS transistor (the gate of which is connected to a control terminal).

Inventors: Sanchez; Jean-Louis (Escalquens, France); Jalade; Jean (Castanet-Tolosan, France); Laur; Jean-Pierre (Albi, France); Foch; Henri (Toulouse, France)

Assignee: Centre National de la Recherche Scientifique (Paris)

Power system control apparatus and method

6,188,205 February 13, 2001 A desired value of reactive power flow between a to-be-controlled power system and an adjoining power system is determined according to measured values of the reactive power flow, effective power flow and desired voltage values of the to-be-controlled power system and of the adjoining power system. The value of a reactive power of the system is calculated according to the desired value of the reactive power flow, measured values of the reactive power flow, and the effective power flow, and the desired voltage value and a measured voltage value in the to-be-controlled power system.

A control apparatus having an electric capacity near to the required value of the reactive power is selected from control apparatus arranged in the system to make the selected control apparatus adjust a voltage of the system. Cooperation of the to-be-controlled power system with the adjoining power system can be performed by collecting locally-existing-information, and a voltage fluctuation and/or a reactive power fluctuation in the system can be immediately suppressed.

Inventors: Tanimoto; Masahiko (Tokyo); Izui; Yoshio (Tokyo); Kowada; Yasuyuki (Tokyo); Iba; Kenji (Tokyo); Deno; Kenichi (Osaka, Japan); Sasaki; Tetsuo (Osaka, Japan)

Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo); The Kansai Electric Power Co., Inc. (Osaka, Japan)

Auxiliary bias circuit for power supply and method

6,181,577 January 30, 2001 This system is for use in a power supply having a bias circuit with a bias transformer, an auxiliary bias circuit, and a method of providing power via the auxiliary bias circuit to an auxiliary load. The auxiliary bias circuit includes a blocking device coupled to the bias transformer. It also includes a storage device, coupled to the blocking device and across the bias transformer, which provides a voltage to drive the auxiliary load without requiring a separate power supply.

Inventors: Chen; Shiaw-Jong Steve (Plano, Texas); Lin; Feng (Plano, Texas)

Assignee: Lucent Technologies, Inc. (Murray Hill, N.J.)

Electronic ballast with embedded network

6,181,086 January 30, 2001 This invention features an electronic ballast for use with gas discharge lamps incorporating a microprocessor-based network controller, which facilitates the direct attachment of the ballast to a local or building-wide energy management system. The use of the ballast allows the production of a luminaire whose light output, power consumption, and other operational or environmental parameters can be monitored and controlled as part of the distributed building control network. A computer network can control lighting functions, such as power on/off and dimming. The ballast includes a provision allowing connection to a local utility so that lighting in large buildings can be cut back in times of high power demand to help balance system loading.

Inventors: Katyl; Robert H. (Vestal, N.Y.); Murcko; Robert M. (Binghamton, N.Y.); Dranchak; David W. (Endwell, N.Y.); Petrozello; James R. (Endicott, N.Y.)

Assignee: Jrs Technology, Inc. (Endicott, N.Y.)

Structure for increasing voltage of transistors

6,180,958 January 30, 2001 This silicon-carbide insulated gate power transistor demonstrates increased maximum voltage. The transistor comprises a field effect or insulated gate transistor with a protective region adjacent the insulated gate that has the opposite conductivity type from the source for protecting the gate insulator material from the degrading or breakdown effects of a large voltage applied across the device.

Inventor: Cooper, Jr.; James Albert (Lafayette, Ind.)

Phase-shifted post-regulator

6,178,098 January 23, 2001 This post regulator is used in a power converter having an inverter coupled to an output rectifier. This is a method of operating a power converter incorporating the post-regulator. Here, the method where a switching circuit, having at least one controllable switch and coupled with an output of the power converter receiving an output voltage from the power converter, produces a phase-shifted waveform and a transformer, having a primary winding coupled to the switching circuit and a secondary winding coupled to the rectifier. This delivers the phase-shifted waveform to the rectifier to regulate the power converter, allowing the inverter to be unregulated.

Inventors: He; Jin (Plano, Texas); Jacobs; Mark E. (Dallas)

Assignee: Lucent Technologies, Inc. (Murray Hill, N.J.)

Integrated circuits with interfaces compatible with varying voltage

6,175,952 January 16, 2001 This is a technique of fabricating an integrated circuit adaptable for use in various operating voltage environments. The same integrated circuit design may be used in different operating modes, depending on the particular option selected. There may be three options 710, 715, and 720. The various options of the integrated circuit are formed on the same integrated circuit. During the fabrication of the integrated circuit, the desired option is selected. This may be accomplished by selecting the appropriate metal masks (725). Other techniques include using programmable links, fuses, cells, and many others. The technique reduces the cost of integrated circuits. The design may be used for a variety of purposes and in a variety of voltage environments without needing to develop and design a specific integrated circuit for each voltage condition.

Inventors: Patel; Rakesh H. (Cupertino, Calif.); Turner; John E. (Santa Cruz, Calif.)

Assignee: Altera Corporation (San Jose, Calif.)

Voltage disturbance mitigation system

6,175,166 January 16, 2001 This low-cost voltage disturbance mitigation system is capable of providing continuous power to a load — despite short interruptions or sag disturbances of the utility power. The interruption and sag mitigation system makes use of a combination of unique thermal and electrical properties of magnetic components, power semiconductor devices, and high-discharge-rate energy storage devices. It also facilitates a modular solution that can be easily and economically scaled up or down for use over a wide range of voltage and power levels, e.g., 480V to 36kV and 500kVA to 10,000kVA.

Inventors: Bapat; Vinod N. (Raleigh, N.C.)

Assignee: ABB Power T&D Company, Inc. (Raleigh, N.C.)

Partial resonance PWM converter

6,172,882 January 9, 2001 This invention provides a partial resonance PWM converter capable of making the switching loss occurring at a switch approximately zero and high efficiency by controlling a switching timing. A series circuit composed of upper and lower main switches is connected in parallel with a dc power supply, and diodes are respectively connected in parallel with each of the main switches in the opposite direction of a polarity of the dc power supply. A series circuit composed of upper and lower auxiliary switches is connected in parallel with the dc power supply, and diodes are respectively connected in parallel with each of the auxiliary switches in the opposite direction of the polarity of the dc power supply. A series resonance circuit composed of a capacitor and an inductor is inserted between the juncture of the upper and lower main switches and a juncture of the upper and lower auxiliary switches.

The switching timing is controlled to make the auxiliary switch turn on immediately before the main switch is switched and, to make the main switch turn off during the diode connected in parallel, while each of the main switches is in ON condition, and to make the auxiliary switch turn off during the ON condition of the diode connected in parallel with each of the auxiliary switches.

Inventors: Tanaka; Katsuaki (Tokyo); Okita; Yoshihisa; Ito; Kazuyuki (Tokyo)

Assignee: TDK Corporation (Tokyo)

Switching power source with digital control circuit

6,169,680 January 2, 2001 The switching power source includes a switching circuit for switching an input power, an output circuit for converting the switching output into a dc output, and a digital control. The digital control is adapted to receive an output voltage analog signal AS1 and an output current analog signal AS2, and to convert the signals AS1 and AS2 into digital signals. Information on power source input voltage or load terminal voltage is obtained through an assumption based on the signals AS1 and AS2.

Inventors: Matsui; Nobuyuki (Kasugai, Japan); Miura; Koichiro (Ichikawa, Japan); Maeyama; Shigetaka (Sakura, Japan); Takeshita; Takaharu (Aichi, Japan)

Assignee: TDK Corporation (Tokyo)

Invertor

6,169,676 January 2, 2001 This invertor has a plurality of invertor bridges which operate in parallel and whose output voltages are summed. The invertor bridges are driven with pulse-duration modulation, according to an auxiliary control voltage. The output voltages of the bridges are summed by a center tap which is grounded by a ground connection. Effective suppression of the common-mode current distortion is achieved by having the switch arranged in the ground connection.

Inventors: Dahler; Peter (Remigen, Switzerland); Gaupp; Osvin (Baden, Switzerland); Linhofer; Gerhard (Baden-Dattwil, Switzerland); Ravot; Jean-Francois (Chevry, France)

Assignee: Asea Brown Boveri AG (Baden, Switzerland)

Snubber circuit

6,169,671 January 2, 2001 The snubber circuit is used in a power converter having a power switch subject to switching losses and a rectifying diode subject to a reverse recovery condition. The circuit and related method mitigates adverse effects associated with the switching losses and the reverse recovery condition. It includes a recovery circuit, having first and second energy storage devices and a snubber diode, coupled to the rectifying diode.

Inventors: Mao; Hengchun (Collin, Texas)

Assignee: Lucent Technologies, Inc. (Murray Hill, N.J.)

Detection circuit for circuit protection devices

6,169,649 January 2, 2001 The circuit is used with a power supply having first and second circuit protection devices. The detection circuit is a method of monitoring the protection devices and a power supply employing the circuit or the method. The circuit includes a bridge circuit coupled to the first and second circuit protection devices, a resistor parallel-coupled across one of the first and second circuit protection devices, and a sensing circuit, coupled to the bridge circuit and the resistor, that senses an imbalance in the bridge circuit and then develops from a failure signal when at least one of the first and second circuit protection devices becomes inoperable.

Inventors: Fasullo; Greg H. (Dallas); He; Jin; Herrmann; John A. (Plano, Texas); Jorgenson; Greg P. (Quinlan, Texas)

Assignee: Lucent Technologies Inc. (Murray Hill, N.J.)

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