公开(公告)号：US10024937B2

公开(公告)日：2018-07-17

申请号：US14345409

申请日：2012-09-20

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Thomas Scheel ,  Christian Hattrup

IPC: G01R33/387 ,  G01R33/54 ,  G01R33/565 ,  G01R33/385 ,  H03F3/217

Abstract: Non-linearities of a gradient amplifier (1) for powering a gradient coil (16) are caused by the finite dead time of the amplifier and/or by a forward voltage drop. The gradient amplifier (1) includes a controllable full bridge (8) and an output filter (9). The full bridge (8) is controlled to provide a desired coil current (ic), including receiving a desired duty cycle (aeff) of the gradient amplifier (1), measuring an input current (ifilt) and an output voltage (ucfilt) of the output filter (9), evaluating an modulator duty cycle (amod), and providing the modulator duty cycle (amod) for controlling the full bridge (8). The gradient amplifier (1) powers a gradient coil (16) including at least two half bridges (10), each having at least two power switches (11) connected in series. An output filter (9) connected to a tapped center points of the half bridges (10) between two the power switches (11). A controller provides a desired duty cycle (aeff) of the gradient amplifier (1), a compensation block (5) for providing an modulator duty cycle (amod). A modulator (6) controls the power switches (11) according to the modulator duty cycle (amod).

公开(公告)号：US09596726B2

公开(公告)日：2017-03-14

申请号：US15008630

申请日：2016-01-28

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Christian Hattrup ,  Georg Sauerländer ,  Carsten Deppe

IPC: H05B37/00 ,  H05B39/00 ,  H05B33/08

CPC classification number: H05B33/0815 ,  H05B33/0812 ,  Y02B20/343

Abstract: In various embodiments a device and method for providing power to an LED unit and modulating light emitted from the LED unit is disclosed. In one example, the device is configured to be connected between a driver and the LED unit. In this example, the device comprises a controllable resistor that receives from the driver a driver output voltage and to provides a load current to power the LED unit, a frequency filter for providing a substantially constant voltage to the LED unit, the frequency filter being connected to the controllable resistor to provide a substantially constant electrical power to the LED unit, and a modulator coupled in series to the LED unit for modulating the drive current and for modulating the emitted light output, wherein the substantially constant voltage applied to the LED unit is further applied to the modulator by means of the frequency filter.

Abstract translation: 在各种实施例中，公开了一种用于向LED单元提供电力并调制从LED单元发射的光的装置和方法。 在一个示例中，该设备被配置为连接在驱动器和LED单元之间。 在该示例中，该装置包括可控电阻器，其从驱动器接收驱动器输出电压并提供负载电流以为LED单元供电;频率滤波器，用于向LED单元提供基本恒定的电压，所述频率滤波器被连接 到可控电阻器以向LED单元提供基本上恒定的电功率，以及与LED单元串联耦合以用于调制驱动电流和调制发射光输出的调制器，其中施加到LED单元的基本恒定的电压为 通过滤波器进一步应用于调制器。

公开(公告)号：US10090097B2

公开(公告)日：2018-10-02

申请号：US15105603

申请日：2014-12-11

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Bernd Ackermann ,  Wolfgang Efftinge ,  Albert Garcia Tormo ,  Christian Hattrup ,  Ralf Kröger ,  Thomas Scheel ,  Peter Lürkens ,  Antonius Johannes Joseph Wismans

IPC: H01F27/28 ,  H01F27/32 ,  H05G1/10

Abstract: A high voltage transformer (50) includes a magnetic core (5); a low voltage winding (10); a high voltage winding (20); at least one inner sleeve (30); and a coil bobbin (24) for carrying the high voltage winding (20). The coil bobbin (24) is configured to be arranged inside the at least one inner sleeve (30) and configured to be attached to the at least one inner sleeve (30) at an outer perimeter of the at least one inner sleeve (30). The coil bobbin (24) includes at least one field-control electrode (22), which is adapted to shape an electric field generated by the high voltage winding (20).