公开(公告)号：US06337800B1

公开(公告)日：2002-01-08

申请号：US09516173

申请日：2000-02-29

Applicant: Chin Chang

Inventor： Chin Chang

IPC: H02M545

CPC classification number: H05B41/28

Abstract: A low frequency to high frequency power converter having a power feedback network from a high frequency voltage source to the low frequency input to a DC supply circuit for the high frequency voltage source. The network forms part of a feedback path which has an inductive impedance at one or more frequencies within the operational range of the high frequency source. In a fluorescent lamp ballast embodiment, feedback is from a load connection point through a path having at least an inductor and a capacitor in series. A low pass filter input to the DC supply circuit may have a shunt capacitor across the rectifier input. The feedback network may include a capacitor in series with the parallel combination of an inductor and a capacitor. In another embodiment the feedback inductor is a tapped inductor connected to the rectifier input, its two inductor portions having mutually exclusive periods of zero current flow.

Abstract translation: 一种低频至高频功率转换器，其具有从高频电压源到低频输入的功率反馈网络，用于高频电压源的直流电源电路。 网络形成反馈路径的一部分，其在高频源的操作范围内的一个或多个频率处具有电感阻抗。 在荧光灯镇流器实施例中，反馈来自负载连接点通过至少具有串联的电感器和电容器的路径。 输入到DC电源电路的低通滤波器可以在整流器输入端具有并联电容器。 反馈网络可以包括与电感器和电容器的并联组合串联的电容器。 在另一个实施例中，反馈电感器是连接到整流器输入端的抽头电感器，其两个电感器部分具有零电流流动的相互排列的周期。

公开(公告)号：US06194839B1

公开(公告)日：2001-02-27

申请号：US09431584

申请日：1999-11-01

Applicant: Chin Chang

Inventor： Chin Chang

IPC: F21P102

CPC classification number: H05B33/0821 ,  F21W2107/00 ,  F21W2111/02 ,  H05B33/089 ,  Y10S362/80

Abstract: A lighting system comprising a plurality of light-emitting diodes and a current driver for driving current through a plurality of parallel disposed, electrically conductive branches, wherein the branches comprise at least one cell. In each cell, each branch has a light-emitting diode with an anode terminal and a cathode terminal. The anode terminal of each light-emitting diode is coupled to the cathode terminal of a light-emitting diode of an adjacent branch via a shunt. The shunt further comprises a light-emitting diode. In each cell, each light-emitting diode may have a different forward voltage characteristic, while still insuring that all of the light-emitting diodes in the arrangement have the same brightness. Upon failure of one light-emitting diode, the remaining light-emitting diodes in the lighting system are not extinguished.

Abstract translation: 一种照明系统，包括多个发光二极管和用于驱动电流通过多个平行布置的导电分支的电流驱动器，其中所述分支包括至少一个单元。 在每个单元中，每个分支具有带有阳极端子和阴极端子的发光二极管。 每个发光二极管的阳极端子经由分流器耦合到相邻支路的发光二极管的阴极端子。 分路还包括发光二极管。 在每个单元中，每个发光二极管可具有不同的正向电压特性，同时仍然确保该布置中的所有发光二极管具有相同的亮度。 一个发光二极管发生故障时，照明系统中剩余的发光二极管不熄灭。

公开(公告)号：US06181079B2

公开(公告)日：2001-01-30

申请号：US09467596

申请日：1999-12-20

Applicant: Chin Chang ,  Adan F. Hernandez

Inventor： Chin Chang ,  Adan F. Hernandez

IPC: H05B3702

CPC classification number: H05B41/282 ,  H05B41/28 ,  H05B41/2827 ,  Y02B20/183

Abstract: A high power electronic ballast for operating one or more discharge lamps includes a power factor correction high frequency converter input stage in cascade with an output stage made up of a half-bridge resonant converter. In place of the conventional isolation transformer in the output stage, the input stage utilizes a single integrated transformer inductor magnetic component, thereby eliminating the usual output stage isolation transformer. The input stage is operated in a critical conduction mode which further improves the electronic ballast.

Abstract translation: 用于操作一个或多个放电灯的大功率电子镇流器包括与由半桥谐振转换器组成的输出级级联的功率因数校正高频变换器输入级。 输入级代替传统隔离变压器，输入级采用单个集成变压器电感器磁性元件，从而消除了通常的输出级隔离变压器。 输入级工作在临界导通模式，进一步改善电子镇流器。

公开(公告)号：US6016257A

公开(公告)日：2000-01-18

申请号：US909922

申请日：1997-08-12

Applicant: Chin Chang ,  Joseph En-Cheng Chang ,  Gert W. Bruning

Inventor： Chin Chang ,  Joseph En-Cheng Chang ,  Gert W. Bruning

IPC: H05B41/24 ,  H02M7/5383 ,  H02M7/53846 ,  H05B41/282 ,  H05B41/285 ,  H05B41/298 ,  H05B41/392 ,  H02M3/335

CPC classification number: H02M7/53846 ,  H02M7/53803 ,  H05B41/2828 ,  H05B41/2856 ,  H05B41/2986 ,  H05B41/3925 ,  H02M2007/4815 ,  H02M2007/53878 ,  Y02B70/1441

Abstract: A power supply, including a resonant circuit having an output voltage and a current oscillating therethrough, and a voltage-fed half-bridge inverter producing a source voltage at an output coupled to the resonant circuit. The inverter is responsive to a driving signal. A driving circuit has a first input representing the sensed current oscillating through the resonant circuit, a second input representing the output voltage, and a reference voltage. The driving circuit includes compensation circuitry for maintaining the output voltage at the reference voltage and commanding a phase shift angle, and phase-shifting circuitry producing the driving signal based on a phase-shift of the sensed current. The amount of phase shift is commanded by the compensation circuitry.

Abstract translation: 一种电源，包括具有输出电压和通过其振荡的电流的谐振电路，以及在耦合到谐振电路的输出处产生源极电压的电压馈电半桥逆变器。 变频器响应于驱动信号。 驱动电路具有表示通过谐振电路振荡的感测电流的第一输入，表示输出电压的第二输入和参考电压。 驱动电路包括用于将输出电压维持在参考电压并指令相移角的补偿电路，以及基于感测电流的相移产生驱动信号的相移电路。 相移量由补偿电路指令。