公开(公告)号：US5877945A

公开(公告)日：1999-03-02

申请号：US932353

申请日：1997-09-17

Applicant: Rui Liu

Inventor： Rui Liu

IPC: H02M3/335

CPC classification number: H02M3/33569

Abstract: An asymmetrical half-bridge converter, a method of operating the same and a power supply that incorporates either the converter or the method. In one embodiment, the converter includes: (1) a power transformer that receives AC input power into a primary winding thereof and transfers the AC input power into first and second secondary windings thereof, the first secondary winding having a secondary to primary turns-ratio smaller than the second secondary winding, (2) an auxiliary inductor coupled across the first and second secondary windings and (3) first and second rectifying diodes having inputs coupled to outer taps of the first and second secondary windings, an output of the converter derived from outputs of the first and second rectifying diodes and a center tap between the first and second secondary windings, an average current in the first secondary winding increased to cause the first and second secondary windings and the auxiliary inductor to share a DC bias current developed in the converter during an operation thereof.

Abstract translation: 不对称半桥转换器，其操作方法以及包含转换器或方法的电源。 在一个实施例中，转换器包括：（1）电力变压器，其将AC输入功率接收到其初级绕组中并将AC输入功率传送到其第一和第二次级绕组中，第一次级绕组具有次级到初级匝数比 小于第二次级绕组，（2）耦合在第一和第二次级绕组两端的辅助电感器和（3）具有耦合到第一和第二次级绕组的外抽头的输入的第一和第二整流二极管，转换器的输出 从第一和第二整流二极管的输出和第一和第二次级绕组之间的中心抽头，第一次级绕组中的平均电流增加，使得第一和第二次级绕组和辅助电感器共享在 该转换器在其操作期间。

公开(公告)号：US5777866A

公开(公告)日：1998-07-07

申请号：US789125

申请日：1997-01-27

Applicant: Mark Elliott Jacobs ,  Yimin Jiang ,  Vijayin Joseph Thottuvelil ,  Rui Liu

Inventor： Mark Elliott Jacobs ,  Yimin Jiang ,  Vijayin Joseph Thottuvelil ,  Rui Liu

IPC: H02M1/00 ,  H02M1/42 ,  H02M1/44 ,  H02M7/06 ,  G05F1/652 ,  H02M5/42

CPC classification number: H02M1/44 ,  H02M1/4225 ,  Y02B70/126

Abstract: A power factor correction system with an EMI line filter at the input includes circuitry to sense the capacitor current of the EMI filter to improve the accuracy of the power factor enhancement. The circuitry consists of a current sensing means connected after the EMI filter, and a voltage sensing capacitor which derives its input signal from a pair of diodes separate from the conventional 4-diode rectifier bridge, which are connected either before or after the EMI filter. The current-sensing means, which may be a resistor, and the voltage-sensing capacitor are tightly coupled to the current control loop of the power factor correction system to compensate for the current in the EMI filter capacitors.

Abstract translation: 在输入端具有EMI线路滤波器的功率因数校正系统包括检测EMI滤波器的电容电流以提高功率因数增强精度的电路。 该电路包括连接在EMI滤波器之后的电流检测装置，以及一个电压感测电容器，它从与传统的四极管整流桥分开的一对二极管得到其输入信号，这些二极管在EMI滤波器之前或之后连接。 电流感测装置（其可以是电阻器）和电压感测电容器紧密耦合到功率因数校正系统的电流控制环路，以补偿EMI滤波电容器中的电流。

公开(公告)号：US5598326A

公开(公告)日：1997-01-28

申请号：US591042

申请日：1996-01-25

Applicant: Rui Liu ,  Wen-Jian Gu

Inventor： Rui Liu ,  Wen-Jian Gu

IPC: H05B41/282 ,  H02M1/00 ,  H02M1/42 ,  H02M5/458 ,  H05B41/28 ,  H02J3/00

CPC classification number: H02M1/4241 ,  H02M5/458 ,  H05B41/28 ,  Y02B70/126

Abstract: A high frequency AC/AC converter apparatus with power factor correction includes an AC/DC converter circuit part to provide power factor correction and a DC/AC inverter circuit part to produce a high frequency AC signal for operation of a load, for example, a discharge lamp. The AC/DC converter circuit part includes a diode and an inductor. The converter apparatus utilizes first and second semiconductor controlled switching devices, one of which is common to each part of the overall converter apparatus. A single control circuit controls both parts of the converter apparatus by controlling the switching of the first and second semiconductor switching devices. There are two possible control techniques, constant duty ratio control or duty ratio sweeping control. A voltage clamp circuit inhibits undesired oscillation of the diode voltage.

Abstract translation: 具有功率因数校正的高频AC / AC转换器装置包括用于提供功率因数校正的AC / DC转换器电路部分和DC / AC逆变器电路部分，以产生用于操作负载的高频AC信号，例如， 放电灯 AC / DC转换器电路部分包括二极管和电感器。 转换器装置利用第一和第二半导体控制的开关装置，其中之一是整个转换器装置的每个部分是共同的。 单个控制电路通过控制第一和第二半导体开关器件的切换来控制转换器装置的两个部分。 有两种可能的控制技术，恒功率比控制或占空比扫描控制。 电压钳位电路抑制二极管电压的不期望的振荡。

公开(公告)号：US5371440A

公开(公告)日：1994-12-06

申请号：US174076

申请日：1993-12-28

Applicant: Rui Liu ,  Wen-Jian Gu

Inventor： Rui Liu ,  Wen-Jian Gu

IPC: H05B41/24 ,  H05B41/282 ,  H05B37/02

CPC classification number: H05B41/24 ,  H05B41/282 ,  H05B41/2828 ,  Y02B20/183 ,  Y10S315/05

Abstract: A miniature electronic ballast with low radio frequency interference (RFI) for operating a discharge lamp by amplitude modulation and two frequency operation. A high frequency operating voltage (approximately 1-2 MHz) is generated and is amplitude modulated at a relatively lower frequency (approximately 20-50 KHz). This operating voltage is demodulated to suppress the high frequency carrier voltage (1-2 MHz) and the low frequency modulating signal (20-50 KHz) itself is applied to the discharge lamp to energize same. The use of the high frequency operating voltage makes it possible to reduce the size of the magnetic components in the electronic ballast, whereas the low frequency voltage actually applied to the discharge lamp avoids problems of RFI that otherwise would occur if the high frequency carrier voltage itself was applied to the discharge lamp.

Abstract translation: 一种具有低射频干扰（RFI）的微型电子镇流器，用于通过幅度调制和两次频率操作来操作放电灯。 产生高频工作电压（大约1-2MHz），并以相对较低的频率（大约20-50KHz）进行幅度调制。 该工作电压被解调以抑制高频载波电压（1-2MHz），并且低频调制信号（20-50KHz）本身被施加到放电灯以对其通电。 使用高频工作电压使得可以减小电子镇流器中的磁性部件的尺寸，而实际施加到放电灯的低频电压避免了RFI的问题，否则如果高频载波电压本身 被施加到放电灯。