| Patent application number | Description | Published |
|---|
| 20130279216 | COMPENSATING RIPPLE ON PULSE WITH MODULATOR OUTPUTS - A ripple compensation apparatus comprises a ripple detection unit to detect a ripple on a dual DC bus, a waveform generation unit to generate a modulated waveform based on a base waveform and the detected ripple, and a multi-phase control signal generation unit to receive the modulated waveform and to generate at least one pulse width modulated control signal based on the modulated waveform. | 10-24-2013 |
| 20130294128 | INVERTER CIRCUIT HAVING A JUNCTION GATE FIELD-EFFECT TRANSISTOR - An example inverter circuit assembly includes at least one first transistor device and at least one second transistor device. The second transistor device comprises a silicon carbide junction gate field-effect transistor. The at least one second transistor device is an inner transistor device relative to the at least one first transistor device. | 11-07-2013 |
| 20140112040 | SYSTEM AND METHOD FOR COMMON-MODE ELIMINATION IN A MULTI-LEVEL CONVERTER - A multi-level converter includes a plurality of alternating current (AC) terminals connected to an AC source or load, at least three direct current (DC) terminals connected to a multi-level DC source or load, and a plurality of solid-state switches that are selectively turned On and Off to connect each of the plurality of AC terminals to one of the DC terminals. A controller provides PWM control signals to the solid-state switches. The controller utilizes space vector modulation to organize the various switching state configurations, and increments the switching states during a first half of the switching period and decrements the switching states during a second half of the switching period to center-align the PWM signals provided about the center of the switching period. The switching states utilized during the switching period dictate the PWM control signals provided to the plurality of switches employed in the three-level converter. | 04-24-2014 |
| 20140139202 | ENHANCED LEAKAGE COMMON MODE INDUCTOR - In some embodiments, a common mode inductor comprises a principal core, and a leakage boosting core located within a threshold distance of the principal core in order to enhance a leakage flux of the inductor. In some embodiments, a circuit comprises a power converter, and a common mode inductor coupled to the power converter, the common mode inductor comprising a principal core and a leakage boosting core located within a threshold distance of the principal core wherein the threshold distance is selected to control a leakage flux of the inductor. | 05-22-2014 |
| 20140268948 | ELECTROMAGNETIC INTERFERENCE (EMI) REDUCTION IN INTERLEAVED POWER CONVERTER - A power converter system includes an interleaved power converter having a plurality of parallel-connected phase legs between DC terminals and an AC terminal. A plurality of parallel-connected inductors are each connected to one of the plurality of parallel-connected phase legs to provide a summed output of the parallel-connected phase legs to the AC terminal. A controller generates PWM signals used to control the state of each of the plurality of phase legs by comparing a carrier signal to a reference signal, wherein a period of the carrier signal is randomly varied from a nominal period. | 09-18-2014 |
| 20140268967 | ELECTROMAGNETIC INTERFERENCE (EMI) REDUCTION IN MULTI-LEVEL POWER CONVERTER - A multi-level power converter system includes a multi-level power converter configured to synthesize at least three direct current (DC) voltages into an alternating current (AC) output voltage, and includes a plurality of transistors. A controller generates pulse-width modulation (PWM) signals used to control a state of the plurality of transistors of the multi-level converter by comparing first and second carrier signals to a reference signals, wherein a period of the first and second carrier signals is randomly varied from a nominal period. | 09-18-2014 |
| 20150100139 | FREQUENCY SHIFTED PI CONTROLLER - A system including a frequency shifted proportional-integral (PI) controller system utilizing input band-shifting, a PI control architecture and inverse band-shifting is disclosed. The frequency shifted PI controller system may eliminate errors and/or take control action based on past and present control errors. The feedback signal may be multiplied times sine of the theta position of the frequency of interest and the feedback signal may be multiplied times cosine of the theta position of the frequency of interest. Stated another way, the initial feedback signal is parsed into sine and cosine components at a particular frequency. This effectively band-shifts the feedback signal for treatment by the PI controller. | 04-09-2015 |
| 20150194905 | UNIVERSAL AC TO DC CONVERTER - A universal AC to DC converter may be configured to convert alternating current (AC) to direct current (DC), such as for use in aerospace applications. The disclosure relates to a single universal power electronic converter capable of converting an AC input voltage, such as a line to neutral input voltage of either 115 Vrms or 230 Vrms nominal to 28 V DC. | 07-09-2015 |
