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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。
    • 59. 发明授权
    • Ripple cancellation circuit for ultra-low-noise power supplies
    • 用于超低噪声电源的纹波消除电路
    • US06693805B1
    • 2004-02-17
    • US10209034
    • 2002-07-31
    • Robert Louis SteigerwaldMichael Joseph Schutten
    • Robert Louis SteigerwaldMichael Joseph Schutten
    • H02M114
    • H02M3/156H02J1/02H02M1/14H02M3/337
    • A low-ripple power supply includes a storage capacitor coupled across load terminals, and an inductor connected to a source of voltage including a varying or pulsatory component and a direct component, for causing a flow of current to said capacitor through the inductor. The varying component of the inductor current flowing in the capacitor results in ripple across the load. A winding is coupled to the inductor for generating a surrogate of the varying inductor current. The surrogate current is added to the inductor current to cancel or reduce the magnitude of the varying current component. This cancellation effectively reduces the varying current component flowing in the storage capacitor, which in turn reduces the ripple appearing across the load terminals.(121)
    • 低纹波电源包括耦合在负载端子之间的存储电容器和连接到包括变化或脉动分量和直接分量的电压源的电感器,用于通过电感器引起电流流向所述电容器。 在电容器中流动的电感电流的变化分量导致负载上的纹波。 绕组耦合到电感器以产生变化的电感器电流的替代。 替代电流被加到电感电流以消除或减小变化电流分量的大小。 这种消除有效地减少了在存储电容器中流动的变化的电流分量,这反过来又减少了跨负载端子出现的波动。(121)