General Electric Company

Ge Precision Healthcare LLC

Han Peng

Juan Antonio Sabate

Ruxi Wang

Ramanujam Ramabhadran

Fengfeng Tao

Xiaohu Liu

John Stanley Glaser

Ahmed Elasser

Yehuda Daniel Levy

Maja Harfman Todorovic

Robert James Thomas

Robert P Thomas

Kieran Andrew Wall

Sayan Acharya

This disclosure regards a magnetic resonance imaging system including a scanner, and gradient drivers. The scanner is to be implemented within a scan room that is shielded from electromagnetic interference. Gradient coils are designed to create a linear gradient in the magnetic field generated in the scanner by a primary magnet. These coils are energized by gradient drivers. The gradient drivers use transformers and other electrical devices in a switching stage configured to generate pulse-width-modulated power. The transformers may have non-magnetic cores to facilitate implementing the gradient drivers within the scan room. The gradient drivers also use a filtering stage which uses inductors and other electrical devices to smooth the pulse-width-modulated power. The inductors within the filters may have non-magnetic cores to facilitate implementing the gradient driver within the scan room. Additionally, an inductor with a hollow wire may be used to circulate fluid to facilitate cooling the gradient driver.

Magnetic resonance imaging switching power amplifier system and methods

An ultrasound pulse generator circuit includes a first gate driver electrically coupled to a first gallium nitride (GaN) transistor, a second gate driver electrically coupled to a second GaN transistor, a first snubber circuit, a second snubber circuit, and a transformer. The first snubber circuit and the second snubber circuit each include a respective capacitor and resistor and each snubber circuit is configured to clamp a voltage overshoot when present. Further, the transformer generates an output signal when operated and the third transformer is electrically connected downstream of the first GaN transistor, the second GaN transistor, the first snubber circuit, and the second snubber circuit. In addition, the transformer includes multiple windings.

High power, high frequency pulser for use in ultrasound

Systems and methods provided herein relate to a gate drive circuit for controlling operation of a wide bandgap semiconductor switch. The systems and methods receive a control signal and configuring an operation signal configured to activate a wide bandgap switch (WBG switch). A profile of the operation signal being based on electrical characteristics of first and second shaping circuits. The systems and methods further deliver the operation signal to the WBG switch.

Systems and methods for a gate drive circuit

A universal power adapter includes a power converter configured to generate an output power based on a switching frequency of the power converter. The universal power adapter also includes a frequency controller operatively coupled to the power converter and configured to control the switching frequency of the power converter. The universal power adapter further includes a switch capacitor circuit having a plurality of capacitive elements, operatively coupled to the power converter. The switch capacitor circuit is configured to switch between the plurality of capacitive elements. The universal power adapter also includes a capacitance controller operatively coupled to the switch capacitor circuit and configured to control the switch capacitor circuit to control switching between the plurality of capacitive elements to maintain a control parameter within a threshold range of.

Universal power adapter and an associated method thereof

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Niskayuna, NY, United States of America

Han Peng