Michael J Ingemi

7402921, Jul 22, 2008

Apr 21, 2005

11/111679

Michael Ingemi - Norwood MA, US
Emanuel Landsman - Lexington MA, US

American Power Conversion Corporation - West Kingston RI

H02J 7/00

307 64

At least one aspect is directed to an uninterruptible power supply that includes a first input to receive a first input voltage from a first voltage source, a second input to receive a second input voltage from a second voltage source, and a boost circuit coupled to the first input and the second input. The boost circuit is configured to provide a positive output DC voltage and a negative output DC voltage derived from at least one of the first input voltage and the second input voltage. The uninterruptible power supply is configured such that in a back-up mode of operation, the negative output DC voltage is derived from the second input voltage using a circuit that includes at least two controlled switches coupled in series.

8228046, Jul 24, 2012

Jun 16, 2009

12/485285

Michael J. Ingemi - Norwood MA, US
Damir Klikic - Waltham MA, US

American Power Conversion Corporation - West Kingston RI

G05F 1/00

323222

Systems and methods for operating an uninterruptable power supply are provided. The uninterruptable power supply may include a rectifier that has a transistor and an inductor. The uninterruptable power supply may also include a controller. A current sensor can be configured to detect inductor current and to provide a detected inductor current value to the controller to generate a current error value based and to generate a pulse width modulation control signal based in part on the current error value. The controller can apply the pulse width modulation control signal to the transistor to adjust a switching frequency of the transistor.

8492928, Jul 23, 2013

Mar 18, 2010

12/727181

Prasad Pyboyina - N. Chelmsford MA, US
Michael J. Ingemi - Norwood MA, US

American Power Conversion Corporation - West Kingston RI

H02J 9/00
H02J 1/00

307 85, 307 64, 307 66, 307 75

A front-end converter in an uninterruptible power supply system is described. In an exemplary design, a front-end converter includes a boost circuit having first and second inputs, positive, negative, and neutral output nodes, an inductor, AC inputs, a battery, and first and second devices. The boost circuit is configured to provide a positive capacitor voltage between the positive and neutral nodes and to provide a negative capacitor voltage between the negative and neutral nodes. The first device selectively couples the inductor to a first AC input or a positive port of the battery and the second device selectively couples a negative port of the battery to the second input. The inductor is coupled to the first input and is shared between an online mode of the converter and an on-battery mode of the converter. The battery is coupled through the inductor to the first input during the on-battery mode.

54384982, Aug 1, 1995

Dec 21, 1993

8/171294

Michael J. Ingemi - Norwood MA

Raytheon Company - Lexington MA

H02M 3335

363 17

A fixed frequency, series resonant converter having a resonant snubber comprising an inductor and capacitor connected across a tank circuit of the converter. An optimum amount of inductance in the resonant snubber minimizes the degree of "shoot-thru," or conduction through a body-diode within a transistor switch of the converter caused by ringing, which allows for nearly sinusoidal current to be provided to a full bridge high voltage rectifier enabling the power converter to operate at a higher frequency. An alternate embodiment applies the resonant snubber only across a selected transistor switch.

20150076905, Mar 19, 2015

Apr 2, 2012

14/389891

Michael J. Ingemi - Norwood MA, US

SCHNEIDER ELECTRIC IT CORPORATION - West Kingston RI

H02M 3/335
H02M 1/42
H02M 1/088

307 31

According to a first aspect, an uninterruptable power supply is provided. In one example, the uninterruptable power supply comprises a controller configured to provide a first current reference signal, the first current reference signal having a periodic waveform including a first half period and a second half period, each half period having a period end, the waveform comprising a substantially rectified sine wave modified such that a value of the rectified sine wave is equal to zero for a predetermined period of time prior to the period end of the second half period, a positive current loop control circuit configured to receive the first current reference signal and provide an output signal to the positive boost circuit, and a negative current loop control circuit configured to provide an output signal to a negative boost circuit.