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    • 3. 发明授权
    • Controlling gradient coils taking the inductive coupling into account
    • 考虑电感耦合的控制梯度线圈
    • US09176209B2
    • 2015-11-03
    • US13552442
    • 2012-07-18
    • Eva EberleinRalph KimmlingenHelmut LenzFranz Schmitt
    • Eva EberleinRalph KimmlingenHelmut LenzFranz Schmitt
    • G01R33/54G01R33/385
    • G01R33/543G01R33/385G01R33/3852
    • A gradient pulse generator generates reference current signals for a plurality of gradient coils of a gradient coil system of a magnetic resonance system and supplies each of the reference current signals to a controller assigned to one of the gradient coils. Also supplied to the respective controller is an actual current signal that is characteristic of the current flowing in the respective gradient coil. Each of the controllers generates a control signal and accordingly drives a gradient power amplifier assigned to the respective gradient coil. The gradient power amplifiers apply a current to the gradient coils assigned to the gradient power amplifiers in accordance with the generated control signals. Each of the controllers is also supplied with the reference current signal or the actual current signal of at least one other gradient coil or the time derivative of the reference current signal or the actual current signal.
    • 梯度脉冲发生器产生用于磁共振系统的梯度线圈系统的多个梯度线圈的参考电流信号,并将每个参考电流信号提供给分配给一个梯度线圈的控制器。 还提供给相应控制器的是实际电流信号,其是在各个梯度线圈中流动的电流的特征。 每个控制器产生控制信号,并相应地驱动分配给相应梯度线圈的梯度功率放大器。 梯度功率放大器根据所生成的控制信号向分配给梯度功率放大器的梯度线圈施加电流。 每个控制器还提供参考电流信号或至少一个其他梯度线圈的实际电流信号或参考电流信号或实际电流信号的时间导数。
    • 5. 发明授权
    • Electric amplifier and method for the control thereof
    • 电放大器及其控制方法
    • US07468607B2
    • 2008-12-23
    • US11629442
    • 2005-06-14
    • Helmut Lenz
    • Helmut Lenz
    • G01V3/00
    • G01R33/3852
    • A method for controlling an electric amplifier is provided. The method includes monitoring a closed-loop control signal of a regulator, which triggers an end stage of the amplifier; adjusting the closed-loop control signal as a function of an output signal of the end stage; comparing the closed-loop control signal with a reference signal; triggering the end stage when an amplitude limit value and a period length limit value are exceeded or undershot by the amplitude value and period length value, respectively, of the closed-loop control signal; and blocking an input side and/or the regulator when the end stage is triggered.
    • 提供了一种用于控制电放大器的方法。 该方法包括监视调节器的闭环控制信号,其触发放大器的末级; 根据终端的输出信号调整闭环控制信号; 将闭环控制信号与参考信号进行比较; 当分别超过或低于闭环控制信号的振幅值和周期长度值的振幅限制值和周期长度限制值时,触发结束级; 并且当终端被触发时阻塞输入侧和/或调节器。
    • 7. 发明授权
    • Power amplifier
    • 功率放大器
    • US06671330B1
    • 2003-12-30
    • US09460120
    • 1999-12-13
    • Helmut LenzChristian Schwingenschloegl
    • Helmut LenzChristian Schwingenschloegl
    • H04K102
    • H03F3/2173H03F3/2178H03F2200/331H03K7/08
    • A power amplifier, particularly a gradient amplifier of a nuclear magnetic resonance tomography apparatus, has at least one switched output stage containing a power bridge circuit formed by a number of switch elements, the bridge circuit being connected to a floating intermediate circuit voltage, as well as at least one digital pulse width modulator that generates pulse-width-modulated control signals for all switch elements of the power bridge circuit from digital input signals in order to generate at least one output stage voltage according to an output stage switching clock. The digital pulse width modulator has a modulator base element that contains a counter with an output for a counter reading, at least one comparator with an input for receiving the counter reading, a further input for receiving one of the digital input signals, an output binary signal representing a “smaller-than” comparison, and a further output for a further binary signal representing a “greater-than” comparison of the counter reading to the digital input signal. Circuitry follows the comparator for generating the control signals from the binary signals.
    • 功率放大器,特别是核磁共振断层摄影装置的梯度放大器,具有至少一个开关输出级,其包含由多个开关元件形成的功率桥式电路,桥式电路也连接到浮动中间电路电压 作为至少一个数字脉宽调制器,其从数字输入信号产生用于电力电桥电路的所有开关元件的脉冲宽度调制控制信号,以便根据输出级切换时钟产生至少一个输出级电压。 数字脉冲宽度调制器具有一个调制器基本元件,该调制器基本元件包含具有用于计数器读数的输出的计数器,至少一个具有用于接收计数器读数的输入的比较器,用于接收数字输入信号之一的另一输入端, 表示“小于”比较的信号,以及表示“计数器读数”与数字输入信号的“大于”比较的另外的二进制信号的另一输出。 电路跟随比较器,用于从二进制信号产生控制信号。