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    • 51. 发明授权
    • High-efficiency switching power amplifier
    • 高效开关功率放大器
    • US6166602A
    • 2000-12-26
    • US406405
    • 1999-09-27
    • Robert Louis SteigerwaldWilliam Frederick Wirth
    • Robert Louis SteigerwaldWilliam Frederick Wirth
    • H03F3/217
    • H03F3/2178
    • 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.
    • 多个低压,串联连接的输入dc-dc转换器将输入提供给适用于驱动MRI系统中的梯度线圈的低频,高压直流交流输出桥式转换器。 相对低压,串联连接的dc-dc转换器或斩波器控制梯度线圈电流,而dc-ac转换器桥将电流转向正确的线圈极性。 输入斩波器的额定电压的二进制加权导致最低电压单元进行大部分高频开关。 这种放大器配置是模块化的并且通过应用预定数量的斩波器和桥接器可以通过常见的方法来满足不同的梯度线圈要求。