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."

DC/DC converter with multiple operating modes 6,157,182 December 5, 2000 A comparator monitors an output voltage V.sub.out. When an output voltage V.sub.out decreases to a predetermined output voltage or less, the comparator sends a signal that represents this state to a controlling circuit. When the controlling circuit receives the signal, it causes a switching device to be turned on. Thus, a coil current I.sub.L is increased. A hysteresis (window) comparator monitors the coil current I.sub.L.

When the coil current I.sub.L reaches a comparison current I.sub.LP, the controlling circuit causes the switching device to be turned off. When the coil current I.sub.L decreases to the comparison current I.sub.LB (where I.sub.LP >I.sub.LB), the controlling circuit references an output signal of the comparator. When the output voltage V.sub.out is lower than the predetermined output voltage, the controlling circuit causes the switching device to be turned on.

Inventors: Tanaka; Hiroto (Aichi, Japan); Aoki; Shinobu (Aichi, Japan). Assignee: Kabushiki Kaisha Toyoda (Kariya, Japan).

Device for switching electric currents 6,157,049 December 5, 2000 This device is for switching electric currents, for high-reverse voltages and low on-state losses. A p-n junction is connected between two terminals. The p-n junction is formed between two semiconductor regions of a semiconductor with a breakdown field strength of at least 10.sup.6 V/cm. A channel region, which adjoins the p-n junction is connected in series with a silicon component between the two terminals. The channel region is provided in a first of the two semiconductor regions. A depletion zone of the p-n junction carries the reverse voltage in the off state of the silicon component.

Inventors: Mitlehner; Heinz (Uttenreuth, DE); Stoisiek; Michael (Ottobrunn, DE). Assignee: Siemens Aktiengesellschaft (Munich, DE).

Power system with plural parallel dc/dc converters 6,154,381 November 28, 2000 This is a distributed staged power system for use in electric and hybrid electric vehicles, and the like. It comprises a plurality of parallel dc-to-dc power modules that are controlled by way of input and output control signal interfaces using a smart controller. The distributed staged power system provides higher efficiency because of smart staging of the power modules. The distributed staged power system enables or disables each of the modules as determined by a smart controller to provide the highest possible conversion efficiency.

Inventors: Kajouke; Lateef A. (San Pedro, Calif.); Schulz; Steven E. (Redondo Beach, Calif.). Assignee: General Motors Corporation (Detroit).

Electric power conversion device 6,154,379 November 28, 2000 The electric power conversion device includes an ac section, a dc section, a switching section connected between the ac section and the dc section for making power conversion by switching operation, and a control section for control the switching section. In the dc section is installed a ripple detection device for detecting a ripple component emerging into the dc side and for generating a ripple detection signal. When the dc component is included in the output current of the ac section, a ripple component having the same frequency with the ac frequency of the ac section output current is superimposed in the dc section. The ripple detection device is installed in the dc section, and thereby the ripple component emerging into the dc section is detected by the ripple detection device as a reflection of the dc offset included in the output current.

The control section receives the ripple detection signal from the ripple detection device, generates the dc component compensation signal for controlling the dc component included in the ac side current based on the ripple detection signal, and controls the switching section by the control signal including the dc component compensation signal to compensate the dc offset.

Inventors: Okita; Yoshihisa (Tokyo). Assignee: TDK Corporation (Tokyo).

Polyphase inverter with neutral-leg inductor 6,154,378 November 28, 2000 A polyphase ac-to-ac inverter (300) for driving a polyphase load (50), which may be an unbalanced load, includes a wye-connected ac voltage source (12) having a neutral terminal (312). The source (12) is coupled to a rectifying arrangement (16) for producing direct voltage across a direct-voltage bus (22). A capacitive bridge (24) on the DC bus (22) has a tap (26) connected to the neutral (312) of the source. The capacitive bridge is isolated from the ac source harmonics by a zero sequence inductor (20). The dc bus voltage at the capacitive bridge feeds a polyphase switching bridge (40). The average voltage at the output of the switching bridge is recovered by a low-pass filter (30) connected to the load. The unbalanced load current is conducted through an inductor to the capacitive bridge tap and the source neutral, with the inductor impedance isolating the load neutral from the dc bus. The switching bridge control can introduce triplen harmonics in the output to increase line-to-line output voltage.

Inventors: Peterson; William Anders (Vestal, N.Y.); Thompson; Michael Francis (Columbia, Md.). Assignee: Lockheed Martin Corporation (Johnson City, N.Y.).

High-frequency, high-density conversion system 6,154,376 November 28, 2000 This high-frequency, high-density power conversion system is designed to provide lossless power switching with a single- or double-ended power converter, the single-ended converter including a pair of input terminals for received dc or rectified ac voltage, a transformer with its primary across the input terminals, a transistor in series between an input terminal and the transformer primary, and a dedicated inductor in series between the other input terminal and the other side of the primary, in which the transistor is switched to provide a sinusoidal output current pulse to the transformer primary.

Inventors: Dan-Harry; Dwari D. (49 Dracut Dr., Vestal, N.Y. 13850).

Battery charging docking cradle for mobile computer 6,154,010 November 28, 2000 The present invention charges rechargeable alkaline batteries installed in a mobile computer. According to the invention, a mobile computer holds one or more rechargeable alkaline batteries. These batteries are charged when the mobile computer is placed in a specially designed device that is attached to an external power supply and attachable to a second computer for communicating with the second computer. Charging circuitry regulates the charging of the rechargeable alkaline batteries held by the mobile computer or a selector manually manipulable by a user could choose the recharging mode.

Inventors: Geiger; Avi R. (Claremont, Calif.). Assignee: Microsoft Corporation (Redmond, Wash.).

Battery charging system and method 6,154,007 November 28, 2000 A battery charging system enables rapid recharging of a working battery without immediate access to ac power or the need for current limit and/or overvoltage protection. The battery charging system makes use of a charging battery having a number of cells greater than the number of cells in the working battery. The charging battery produces a charging current that is proportional to the difference in the number of cells in each battery.

The number of cells in the charging battery is selected such that the series voltage of the charging battery cells is less than or equal to the maximum rated voltage of the working battery. While the charging battery is generally incapable of overcharging the working battery, it does not require current limit and/or overvoltage protection circuitry.

Inventors: Shaver; David M. (Brockville, Calif.); Gifford; Carl W. (Elizabethtown, Calif.). Assignee: Black & Decker Inc. (Newark, Del.).

High-intensity cooler defines spiral flow 6,152,215 November 28, 2000 A high-intensity cooling device is disclosed. The cooling device includes first and second superimposed laminations, with each of the laminations including a cavity having a spiral fin, defining a spiral flow chamber.

One of the flow chambers directs a coolant medium along an inwardly spiraling flow path, while the other directs the coolant medium along an outwardly spiraling flow path, with the flow chambers being in flow communication. A coolant inlet communicates the coolant medium to the first flow chamber, and a coolant outlet communicates the coolant medium away from the second. Thus, the coolant medium may be routed along a spiral flow path through each of the laminations.

Inventors: Niggemann; Richard Everett (Rockford, Ill.). Assignee: Sundstrand Corporation (Rockford, Ill.).

System for compensating for voltage variations 6,150,963 November 21, 2000 A method and system produce a PWM signal using a comparator having first and second input terminals and an output terminal at which the PWM signal is produced.

The method includes powering the comparator with a supply voltage and receiving a modulating signal at the first input terminal. The method creates a carrier signal with a constant frequency and a maximum amplitude equal to the supply voltage.

The comparator receives the carrier signal at the second input terminal and compares the carrier signal to the modulating signal, thereby producing the PWM signal at the output terminal. By creating and using a carrier signal with a maximum amplitude equal to the supply voltage, the PWM signal produced by the method is immune from changes in the supply voltage.

Inventors: Boscolo; Michele (Sottomarina, Italy); Galbiati; Ezio (Agnadello, Italy); Vitti; Marco (Sesto San Giovanni, Italy). Assignee: STMicroelectronics S.r.l. (Agrate Brianza, Italy).

System for drive unit and electric machine 6,149,544 November 21, 2000 This invention concerns a drive system, especially for a motor vehicle, with a drive assembly, especially an internal combustion engine; and at least one electric machine, which acts as an electromagnetic coupling in the drive train of the drive system and/or as an active transmission synchronization device.

This drive system for a motor vehicle with a drive unit and electric machine is also oriented to a method of operating a drive system.

Inventors: Masberg; Ullrich (Rosrath, DE); Pels; Thomas (Overath, DE); Zeyen; Klaus-Peter (Koln, DE); Grundl; Andreas (Munchen, DE); Hoffmann; Bernhard (Starnberg, DE). Assignee: ISAD Electronic Systems GmbH & Co. KG (Cologne, DE); Grundl und Hoffmann GmbH (Starnberg, DE).

Single-stage input current shaping technique 6,147,882 November 14, 2000 A single-stage input-current-shaping (S.sup.2 ICS) converter of the present invention integrates a voltage-doubler-rectifier front-end with a dc/dc output stage. Two families of voltage-doubler S.sup.2 ICS converters are disclosed. In one family, a 2-terminal dither source is provided between a boost inductor and a common input terminal of a storage capacitor and the dc/dc output stage. The 2-terminal dither source includes two paths connected in parallel: a first path for charging and a second path for discharging the boost inductor at a high frequency (HF). In the other family, a 3-terminal dither source includes a third terminal coupled to a pulsating node of the dc/dc output stage. In the 3-terminal dither source, the HF charging path of the boost inductor is coupled between the boost inductor and the pulsating node of the dc/dc output stage, while the HF discharging path of the boost inductor is coupled between the boost inductor and the common input terminal of the storage capacitor and the dc/dc output stage. Due to the voltage-doubler-rectifier front-end, reduction of line-current harmonics can be achieved with a higher conversion efficiency, as compared to a corresponding S.sup.2 ICS converter with a conventional full-bridge rectifier. A converter of the present invention requires storage capacitors of a lower voltage rating and a smaller total capacitance than the conventional S.sup.2 ICS counterpart. The present invention thereby reduces the size and the cost of the power supply.

Inventors: Huber; Laszlo (Apex, N.C.); Zhang; Jindong (Blacksburg, Va.); Jovanovic; Milan M. (Cary, N.C.); Lee; Fred C. (Blacksburg, Va.). Assignee: Delta Electronics, Inc. (Taipei, Taiwan); Virginia Tech. Intellectual Properties, Inc. (Blacksburg, Va.).

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