公开(公告)号：US5986899A

公开(公告)日：1999-11-16

申请号：US266199

申请日：1999-03-10

申请人： Gang Xia ,  Fei Ma

发明人： Gang Xia ,  Fei Ma

IPC分类号： H02M3/335

CPC分类号： H02M3/33576 ,  H02M3/33592 ,  Y02B70/1475

摘要： A single ended forward DC-to-DC converter includes a transformer having a primary winding electrically connected to a primary switch and a secondary winding electrically connected to a secondary switch and a clamping capacitor. The clamping capacitor stores the magnetization energy from the secondary winding when the primary switch is turned off, thus causing the transformer core to be reset during the period that the primary switch remains off. The converter can use mosfets as the primary and secondary switches, such that a change in the voltage at the secondary winding of the transformer, due to the turning off of the primary switch, results in an automatic turning on of the secondary switch. The combination of the clamping capacitor and the mosfet switches increases the simplicity of the DC-to-DC converter while eliminating undesirable characteristics such as dead time and voltage stresses on the switches. The DC-to-DC converter of the present invention can be used to carry out synchronous rectification and zero voltage switching.

公开(公告)号：US5886881A

公开(公告)日：1999-03-23

申请号：US105511

申请日：1998-06-26

申请人： Gang Xia ,  Fei Ma

发明人： Gang Xia ,  Fei Ma

IPC分类号： H02M3/335

CPC分类号： H02M3/33576 ,  H02M3/33592 ,  Y02B70/1475

摘要： A single ended forward DC-to-DC converter includes a transformer having a primary winding electrically connected to a primary switch and a secondary winding electrically connected to a secondary switch and a clamping capacitor. The clamping capacitor stores the magnetization energy from the secondary winding when the primary switch is turned off, thus causing the transformer core to be reset during the period that the primary switch remains off. The converter can use mosfets as the primary and secondary switches, such that a change in the voltage at the secondary winding of the transformer, due to the turning off of the primary switch, results in an automatic turning on of the secondary switch. The combination of the clamping capacitor and the mosfet switches increases the simplicity of the DC-to-DC converter while eliminating undesirable characteristics such as dead time and voltage stresses on the switches. The DC-to-DC converter of the present invention can be used to carry out synchronous rectification and zero voltage switching.

公开(公告)号：US20130047858A1

公开(公告)日：2013-02-28

申请号：US13222735

申请日：2011-08-31

申请人： John R. Bohlen ,  Fa Jian Zhu ,  Yong Wei Wu ,  Run Gang Xia ,  Xiao Fei Chen

发明人： John R. Bohlen ,  Fa Jian Zhu ,  Yong Wei Wu ,  Run Gang Xia ,  Xiao Fei Chen

IPC分类号： B03C3/47 ,  B03C3/66

CPC分类号： B03C3/66 ,  B03C3/08 ,  B03C3/12 ,  B03C3/368 ,  B03C3/41 ,  B03C3/47 ,  B03C2201/04 ,  Y02A50/2357

摘要： An electrostatic precipitator cell containing a collection assembly, a plurality of collection assembly ground plates disposed in the collection assembly, a plurality of banks disposed in the collection assembly, wherein each bank containing a collection assembly charge plate and a voltage isolator is described. Electrically isolating portions of an electrostatic precipitator cell results in reduced arcing and overall increases in cleaning efficiency. As air cleaner utilizing the electrostatic precipitator with isolated banks is also described.

摘要翻译： 一种包含收集组件的静电除尘器电池，设置在收集组件中的多个收集组件接地板，设置在收集组件中的多个组，其中描述了包含收集组件充电板和电压隔离器的每个组。 静电除尘器电池的电隔离部分导致电弧放电减少和清洁效率的总体提高。 另外还描述了利用具有隔离堤的静电除尘器的空气净化器。

公开(公告)号：US6141224A

公开(公告)日：2000-10-31

申请号：US439748

申请日：1999-11-15

申请人： Gang Xia ,  Fei Ma

发明人： Gang Xia ,  Fei Ma

IPC分类号： H02M3/335

CPC分类号： H02M3/33576 ,  H02M3/33592 ,  Y02B70/1475

摘要： A single ended forward DC-to-DC converter includes a transformer having a primary winding electrically connected to a primary switch and a secondary winding electrically connected to a secondary switch and a clamping capacitor. The clamping capacitor stores the magnetization energy from the secondary winding when the primary switch is turned off, thus causing the transformer core to be reset during the period that the primary switch remains off. The converter can use mosfets as the primary and secondary switches, such that a change in the voltage at the secondary winding of the transformer, due to the turning off of the primary switch, results in an automatic turning on of the secondary switch. The combination of the clamping capacitor and the mosfet switches increases the simplicity of the DC-to-DC converter while eliminating undesirable characteristics such as dead time and voltage stresses on the switches. The DC-to-DC converter of the present invention can be used to carry out synchronous rectification and zero voltage switching.

摘要翻译： 单端正向DC-DC转换器包括具有与初级开关电连接的初级绕组的变压器和与次级开关和钳位电容器电连接的次级绕组。 当初级开关断开时，钳位电容器存储来自次级绕组的磁化能，从而在主开关保持断开的时段内使变压器芯复位。 转换器可以使用mosfet作为主要和次要开关，使得由于主开关的断开而导致的变压器次级绕组的电压变化导致二次开关的自动接通。 夹紧电容器和MOSFET开关的组合增加了DC-DC转换器的简单性，同时消除了不需要的特性，例如开关上的死区时间和电压应力。 本发明的DC-DC转换器可用于进行同步整流和零电压切换。

公开(公告)号：US06278621B1

公开(公告)日：2001-08-21

申请号：US09587943

申请日：2000-06-06

申请人： Gang Xia ,  Fei Ma

发明人： Gang Xia ,  Fei Ma

IPC分类号： H02M3335

CPC分类号： H02M3/33576 ,  H02M3/33592 ,  Y02B70/1475

摘要： A single ended forward DC-to-DC converter includes a transformer having a. primary winding electrically connected to a primary switch and a secondary winding electrically connected to a secondary switch and a clamping capacitor. The clamping capacitor stores the magnetization energy from the secondary winding when the primary switch is turned off, thus causing the transformer core to be reset during the period that the primary switch remains off. The converter can use mosfets as the primary and secondary switches, such that a change in the voltage at the secondary winding of the transformer, due to the turning off of the primary switch, results in an automatic turning on of the secondary switch. The combination of the clamping capacitor and the mosfet switches increases the simplicity of the DC-to-DC converter while eliminating undesirable characteristics such as dead time and voltage stresses on the switches. The DC-to-DC converter of the present invention can be used to carry out synchronous rectification and zero voltage switching.

摘要翻译： 单端正向DC-DC转换器包括具有a的变压器。 初级绕组电连接到初级开关和次级绕组，其电连接到次级开关和钳位电容器。 当初级开关断开时，钳位电容器存储来自次级绕组的磁化能，从而在主开关保持断开的时段内使变压器芯复位。 转换器可以使用mosfet作为主要和次要开关，使得由于主开关的断开而导致的变压器次级绕组的电压变化导致二次开关的自动接通。 夹紧电容器和MOSFET开关的组合增加了DC-DC转换器的简单性，同时消除了不需要的特性，例如开关上的死区时间和电压应力。 本发明的DC-DC转换器可用于进行同步整流和零电压切换。

公开(公告)号：US06275401B1

公开(公告)日：2001-08-14

申请号：US09479964

申请日：2000-01-10

申请人： Gang Xia

发明人： Gang Xia

IPC分类号： H02M7217

CPC分类号： H02M3/33592 ,  Y02B70/1475

摘要： A synchronous rectification circuit for a DC-DC power converter can operate efficiently with a primary drive voltage that remains at a zero voltage level during a portion of the power conduction cycle. The DC-DC power converter includes a primary side power circuit providing a symmetrically varying power signal that remains at a zero voltage level for a portion of a conduction cycle. A first secondary side power circuit is inductively coupled to the primary side power circuit, and has an output terminal that provides an output voltage. The first secondary side power circuit further comprises first and second synchronous rectifiers having respective activation terminals. The synchronous rectifiers are adapted to alternately activate in synchronism with non-zero voltage level portions of the conduction cycle. A second secondary side power circuit is inductively coupled to the first secondary side power circuit and has polarity reversed with respect to the first secondary side power circuit. The second secondary side power circuit comprises first and second switching devices having respective activation terminals respectively coupled to the activation terminals of the first and second synchronous rectifiers. The first and second switching devices are adapted to alternately activate in inverse synchronism with the non-zero voltage level portions of the conduction cycle. The first and second synchronous rectifiers are selected to have lower activation voltage thresholds than the first and second switching devices such that both the first and second synchronous rectifiers remains activated during a successive zero voltage level portion of the conduction cycle.

摘要翻译： 用于DC-DC功率转换器的同步整流电路可以在功率传导周期的一部分期间以保持在零电压电平的主驱动电压有效地工作。 DC-DC功率转换器包括初级侧电源电路，其提供对称变化的功率信号，其对于导通周期的一部分保持在零电压电平。 第一次级侧电源电路感应耦合到初级侧电源电路，并且具有提供输出电压的输出端子。 第一次级侧电源电路还包括具有各自的激活端子的第一和第二同步整流器。 同步整流器适于与导通周期的非零电压电平部分同步地交替地激活。 第二二次侧电源电路电感耦合到第一次级侧电源电路，并且相对于第一次级侧电源电路具有极性反转。 第二二次侧电源电路包括第一和第二开关装置，其具有分别耦合到第一和第二同步整流器的启动端子的相应的启动端子。 第一和第二开关装置适于与导通周期的非零电压电平部分反向同步地交替地启动。 选择第一和第二同步整流器以具有比第一和第二开关器件更低的启动电压阈值，使得第一和第二同步整流器在导通周期的连续零电压电平部分期间保持激活。

公开(公告)号：US5781420A

公开(公告)日：1998-07-14

申请号：US730684

申请日：1996-10-11

申请人： Gang Xia ,  Fei Ma

发明人： Gang Xia ,  Fei Ma

IPC分类号： H02M3/335

CPC分类号： H02M3/33576 ,  H02M3/33592 ,  Y02B70/1475

摘要： A single ended forward DC-to-DC converter includes a transformer having a primary winding electrically connected to a primary switch and a secondary winding electrically connected to a secondary switch and a clamping capacitor. The clamping capacitor stores the magnetization energy from the secondary winding when the primary switch is turned off, thus causing the transformer core to be reset during the period that the primary switch remains off. The converter can use mosfets as the primary and secondary switches, such that a change in the voltage at the secondary winding of the transformer, due to the turning off of the primary switch, results in an automatic turning on of the secondary switch. The combination of the clamping capacitor and the mosfet switches increases the simplicity of the DC-to-DC converter while eliminating undesirable characteristics such as dead time and voltage stresses on the switches. The DC-to-DC converter of the present invention can be used to carry out synchronous rectification and zero voltage switching.