High-efficiency switching power amplifier

Details High-efficiency switching power amplifier High-efficiency switching power amplifier

1999-09-27

2000-12-26

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including class d amplifier

330207A, 327124, 363132, H03F 3217

Patent

active

061666025

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.

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patent: 5892664 (1999-04-01), Vedder
patent: 6016258 (2000-01-01), Jain et al.
patent: 6031746 (2000-02-01), Steigerwald et al.

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