Patent Number: 6,166,602

Title: High-efficiency switching power amplifier

Abstract: A plurality of low-voltage, series-connected input dc-dc converters provide the input to a low-frequency, high-voltage dc-ac output bridge converter suitable for driving a gradient coil in an MRI system. The relatively low-voltage, series-connected dc-dc converters, or choppers, control the gradient coil current, while the dc-ac converter bridge steers the current to the proper coil polarity. A binary weighting of the voltage ratings of the input choppers results in the lowest voltage unit doing most of the high-frequency switching. Such an amplifier configuration is modular and allows for different gradient coil requirements to be met with a common approach by applying a predetermined number of choppers and bridges.

Inventors: Steigerwald; Robert Louis (Burnt Hills, NY), Wirth; William Frederick (Johnson Creek, WI)

Assignee: General Electric Company

International Classification: H03F 3/20 (20060101); H03F 3/217 (20060101); H03F 003/217 ()

Expiration Date: 12/26/2017