公开(公告)号：US09332602B2

公开(公告)日：2016-05-03

申请号：US14104034

申请日：2013-12-12

Applicant: General Electric Company

Inventor： Bruce Richard Roberts ,  Shahzil Rana

IPC: H05B33/08

CPC classification number: H05B33/0815 ,  Y02B20/346

Abstract: A system and apparatus including a light emitting diode (LED) driver provides an operating DC voltage to a plurality of LEDs connected in series (LED array) for providing illumination. A rectifier circuit and a filter are coupled to an AC power supply and provide a rectified and filtered DC source voltage to a transformerless voltage boost circuit, which provides the operating DC voltage to the LED array. A hysteretic self-oscillating circuit drives the transformerless voltage boost circuit at an oscillation frequency. A tap is connected between two LEDs in the LED array, which provides an auxiliary DC voltage, which is used to power the oscillating circuit and which eliminates the need for the LED driver to have a conventional transformer or auxiliary DC-DC power converter. The transformerless voltage boost circuit includes an inductor, a capacitor, a diode, and a switch wherein the switch is controlled by the oscillating circuit.

Abstract translation: 包括发光二极管（LED）驱动器的系统和设备为串联连接的多个LED（LED阵列）提供工作DC电压以提供照明。 整流器电路和滤波器耦合到AC电源，并将经整流和滤波的DC源电压提供给无变压器电压升压电路，其向LED阵列提供工作DC电压。 迟滞式自振荡电路以无振荡频率驱动无变压器升压电路。 在LED阵列中的两个LED之间连接有抽头，其提供辅助DC电压，其用于为振荡电路供电，并且不需要LED驱动器来具有常规的变压器或辅助DC-DC电力转换器。 无变压器升压电路包括电感器，电容器，二极管和开关，其中开关由振荡电路控制。

公开(公告)号：US10085698B2

公开(公告)日：2018-10-02

申请号：US15006840

申请日：2016-01-26

Applicant: General Electric Company

Inventor： Jiahua Fan ,  Xiaoyu Tian ,  Dominic Joseph Crotty

IPC: A61B6/03 ,  H05G1/34 ,  A61B6/00

Abstract: Methods and systems are provided for automated tube current modulation (ATCM). In one embodiment, a method for an imaging system comprises: calculating a desired dose level based on a clinical task, a size of a subject to be scanned, and an image quality level; generating a scan protocol based on a relation between the image quality level and at least one characteristic of the imaging system; and performing a scan of the subject at the desired dose level and according to the generated scan protocol. In this way, ATCM can be optimized based on elements that impact image quality such as the clinical task, the physical characteristics of the imaging system, the individual patient, and the reader's preference.