公开(公告)号：US20150091458A1

公开(公告)日：2015-04-02

申请号：US14042810

申请日：2013-10-01

Applicant: General Electric Company

Inventor： Yehuda Daniel LEVY

IPC: H02M3/335 ,  H05B33/08

CPC classification number: H05B33/0815 ,  H02M1/4258 ,  H02M3/28 ,  Y02B70/126

Abstract: A two-stage AC-DC power converter for powering a load at a substantially constant current, and related methods and systems. The first stage of the AC-DC power converter includes a conventional power factor correction (PFC) circuit that outputs a direct current (DC) voltage and a DC current. The second stage of the AC-DC power converter includes a low voltage flyback circuit that receives the DC voltage and the DC current. The low voltage flyback circuit includes a flyback transformer and a switch circuit that selectably toggles the substantially constant output current provided by the low voltage flyback circuit to the load between a first and a second, preset constant current. The secondary windings of the flyback transformer are split into two sections, and the switch circuit toggles the two sections of the secondary windings between a series and a parallel configuration to provide the first and second, preset constant currents.

Abstract translation: 一种用于以基本恒定的电流为负载供电的两级AC-DC电力转换器，以及相关的方法和系统。 AC-DC功率转换器的第一级包括输出直流（DC）电压和直流电流的常规功率因数校正（PFC）电路。 AC-DC电力转换器的第二级包括接收DC电压和DC电流的低电压反激电路。 低电压反激电路包括反激式变压器和开关电路，可选地将由低电压反激电路提供的基本上恒定的输出电流切换到第一和第二预置恒定电流之间的负载。 回扫变压器的次级绕组分为两部分，开关电路将次级绕组的两个部分切换成串联和并联配置，以提供第一和第二预置恒定电流。

公开(公告)号：US20170163257A1

公开(公告)日：2017-06-08

申请号：US14958411

申请日：2015-12-03

Applicant: General Electric Company

Inventor： Yehuda Daniel LEVY ,  Ramanujam RAMABHADRAN

IPC: H03K17/687 ,  H03K17/567 ,  H05B33/08

CPC classification number: H03K17/687 ,  H02M1/08 ,  H03K17/063 ,  H03K17/567 ,  H03K2017/066 ,  H03K2217/0063 ,  H03K2217/0081 ,  H05B33/0815 ,  H05B33/0845

Abstract: There are provided a driver circuit, a method of driving a power switch, and a ballast circuit. For example, there is provided a driver circuit configured to receive a control signal and operate a power switch. The driver circuit includes a first switch, a second switch, and a capacitor coupled to control terminals of the first and second switches. The driver circuit further includes a first diode coupled to a first bias terminal of the driver circuit and to the capacitor. Furthermore, the driver circuit includes a second diode coupled to a second bias terminal of the driver circuit and to a terminal of the power switch.

公开(公告)号：US20150092458A1

公开(公告)日：2015-04-02

申请号：US14042814

申请日：2013-10-01

Applicant: General Electric Company

Inventor： Yehuda Daniel LEVY

IPC: H02M3/335 ,  H05B33/08

CPC classification number: H02M3/33507 ,  H02M1/12 ,  H02M1/4208 ,  H02M1/4258 ,  H02M2001/4291 ,  H05B33/0815 ,  Y02B70/126

Abstract: A two-stage AC-DC power converter for powering a load at a substantially constant current, and related methods and systems. The first or front end stage of the AC-DC power converter includes a buck topology power factor correction (PFC) circuit and a PFC controller. The second stage of the AC-DC power converter includes a conventional isolation and regulator circuit configured to receive the DC voltage and DC current output by the buck PFC and then to provide the substantially constant current to the load. By multiplying the rectified input voltage sensed by the PFC controller, the input AC current drawn by the buck PFC circuit has a much improved total harmonic distortion (THD), which is achievable without the need for using an expensive PFC controller. The rectified input voltage sensed by the PFC controller is multiplied using a Zener diode ladder.

Abstract translation: 一种用于以基本恒定的电流为负载供电的两级AC-DC电力转换器，以及相关的方法和系统。 AC-DC功率转换器的第一或前端级包括降压拓扑功率因数校正（PFC）电路和PFC控制器。 AC-DC电力转换器的第二级包括常规的隔离和调节器电路，其被配置为接收由降压PFC输出的直流电压和直流电流，然后向负载提供基本恒定的电流。 通过将PFC控制器检测到的整流输入电压相乘，由降压PFC电路吸收的输入交流电流具有大大提高的总谐波失真（THD），无需使用昂贵的PFC控制器即可实现。 由PFC控制器感测到的整流输入电压使用齐纳二极管梯形变倍。