公开(公告)号：US20080122422A1

公开(公告)日：2008-05-29

申请号：US11951228

申请日：2007-12-05

申请人： Wanfeng Zhang ,  Yan-Fei Liu ,  Bin Wu

发明人： Wanfeng Zhang ,  Yan-Fei Liu ,  Bin Wu

IPC分类号： H02M3/156

CPC分类号： H02M3/157 ,  H02M1/4225 ,  H02M2001/4275 ,  Y02B70/126 ,  Y02P80/112

摘要： A method and apparatus to implement parallel current mode control that is suitable for digital and analog implementation. A duty cycle algorithm is composed of a voltage term and a parallel current term which depends on the inductor current change between the inductor current value at the beginning of a switching cycle and the reference inductor current value at the end of that switching cycle. Parallel current mode control can be applied to all DC-DC converters, including both non-isolated and isolated topologies. It can also be applied to AC-DC converters with power factor correction.

摘要翻译： 一种适用于数字和模拟实现的并行电流模式控制的方法和装置。 占空比算法由电压项和并联电流项组成，取决于开关周期开始时的电感电流值与开关周期结束时的参考电感电流值之间的电感电流变化。 并联电流模式控制可应用于所有DC-DC转换器，包括非隔离和隔离拓扑。 它也可以应用于具有功率因数校正的AC-DC转换器。

公开(公告)号：US06980783B2

公开(公告)日：2005-12-27

申请号：US10265168

申请日：2002-10-03

申请人： Yan-Fei Liu ,  Raymond Orr ,  Kai Xu

发明人： Yan-Fei Liu ,  Raymond Orr ,  Kai Xu

IPC分类号： H02M3/156 ,  H04B1/10

CPC分类号： H02M3/156 ,  H02M2001/0009 ,  H02M2001/0022

摘要： A circuit controls the low frequency load currents drawn by components of telecommunications systems. The circuit includes a power converter, a first sense circuit, a second sense circuit, a comparator, and a power converter control circuit. The power converter control circuit controls the power converter's duty cycle in accordance with the input signal compared to a reference. In this manner, the low frequency load currents may be easily and economically controlled.

摘要翻译： 电路控制电信系统组件所绘制的低频负载电流。 该电路包括功率转换器，第一感测电路，第二感测电路，比较器和功率转换器控制电路。 功率转换器控制电路根据与参考相比的输入信号来控制功率转换器的占空比。 以这种方式，可以容易且经济地控制低频负载电流。

公开(公告)号：US20050024894A1

公开(公告)日：2005-02-03

申请号：US10729970

申请日：2003-12-09

申请人： Yan-Fei Liu ,  Sheng Ye

发明人： Yan-Fei Liu ,  Sheng Ye

IPC分类号： H02M3/28 ,  H02M3/335 ,  H02J1/00

CPC分类号： H02M3/285 ,  H02M3/33576

摘要： One DC-DC converter includes primary side circuit between high and low side inputs including first primary winding of first transformer, and auxiliary section; and rectifier circuits, with separate secondary windings of first transformer, and in parallel with one another and output and capacitor; an output capacitor between outputs and across rectifier circuit. Auxiliary causes transfer of power from first primary to first secondary winding and operation without saturation. Another converter includes primary side circuit including primary winding of plurality of transformers, and an auxiliary section; a rectifier circuit having secondary winding of the plurality of transformers, the rectifier circuit in parallel with output and capacitor; an output capacitor between outputs and across rectifier circuit. Auxiliary section includes switches for connecting and disconnecting primary windings from input, and for resetting transformers. Alternatively, auxiliary section includes switches and capacitors. Switches and capacitors in auxiliary section shared between transformers.

摘要翻译： 一个DC-DC转换器包括高低侧输入之间的初级侧电路，包括第一变压器的第一初级绕组和辅助部分; 和整流电路，具有第一变压器的单独的次级绕组，并且彼此并联并输出和电容器; 输出和整流电路之间的输出电容。 辅助电源从第一次初级到次级绕组转换，无饱和操作。 另一转换器包括：初级侧电路，包括多个变压器的初级绕组和辅助部分; 整流电路具有多个变压器的次级绕组，整流电路与输出和电容并联; 输出和整流电路之间的输出电容。 辅助部分包括用于从输入端连接和断开初级绕组以及用于复位变压器的开关。 或者，辅助部分包括开关和电容器。 变压器共用的辅助部分中的开关和电容器。

公开(公告)号：US10892254B2

公开(公告)日：2021-01-12

申请号：US16409785

申请日：2019-05-11

申请人： Zhanming Li ,  Guanhou Luo ,  Yue Fu ,  Wai Tung Ng ,  Yan-Fei Liu

发明人： Zhanming Li ,  Guanhou Luo ,  Yue Fu ,  Wai Tung Ng ,  Yan-Fei Liu

IPC分类号： H01L25/07 ,  H01L23/00 ,  H01L23/498 ,  H01L23/544 ,  H01L21/48 ,  H01L25/00

摘要： Use of gallium nitride (GaN) semiconductor material for power devices is challenging due to low yield caused by high defect density on the wafer. Device layout on the wafer, chip probing, and device packaging increase the yield of large area power devices. Device dies containing a plurality of lower-power sub-devices are used to achieve high power ratings, by connecting only functional sub-devices together in the package, while being tolerant of defective sub-devices by selectively excluding the defective sub-devices. The packages and methods are particularly relevant to GaN power switching devices such as high electron mobility transistors (GaN HEMT).

公开(公告)号：US10277146B2

公开(公告)日：2019-04-30

申请号：US15547005

申请日：2016-01-29

申请人： Hongliang Wang ,  Yan-Fei Liu

发明人： Hongliang Wang ,  Yan-Fei Liu

IPC分类号： H02M7/797 ,  H02M3/155 ,  H02J3/38

摘要： Disclosed are half bridge inverter unit and inverter thereof. The half bridge inverter unit includes an inverter controlling module and inductors. The inverter controlling module provides different connection modes based on different operation modes so that the inverter meets the requirement of wide input voltage range as it can work in either voltage step-up mode or voltage step-down mode. The mid-point voltage between the DC series capacitors connected in parallel with DC power supply can be balanced automatically by taking advantage of the grid voltage symmetry with regard to positive and negative half cycles. The inverter is of single stage structure. It has advantages of low power loss, low cost, high efficiency and reliability.

公开(公告)号：US20180309384A1

公开(公告)日：2018-10-25

申请号：US15768552

申请日：2016-11-07

申请人： Hongliang Wang ,  Yan-Fei Liu

发明人： Hongliang Wang ,  Yan-Fei Liu

IPC分类号： H02M7/483

CPC分类号： H02M7/483 ,  H02M7/487

摘要： A single-phase four-level inverter circuit topology and a three-phase four-level inverter circuit topology. The single-phase four-level inverter circuit topology is adapted to be used with two series-connected direct current power sources, so as to enable a first direct current power source or a second direct current power source to supply power to a load of the four-level inverter circuit topology, alternatively, any one of two direct current power sources is first algebraically superimposed with a flying capacitor and then supplies the power to the load of the four-level inverter circuit topology (M), thereby making the four-level inverter circuit topology output four different levels. The single-phase and three-phase four-level inverter circuit topologies reduce the system cost and volume by using a flying capacitor, the voltage utilization rate is three times that of the existing four-level inverter circuit topology under the same operating conditions, and the direct current side neutral point voltage can be balanced without requiring additional circuits.

公开(公告)号：US20180234028A1

公开(公告)日：2018-08-16

申请号：US15885941

申请日：2018-02-01

申请人： Yang Chen ,  Hongliang Wang ,  Yan-Fei Liu ,  Zhanming Li ,  Yue Fu

发明人： Yang Chen ,  Hongliang Wang ,  Yan-Fei Liu ,  Zhanming Li ,  Yue Fu

IPC分类号： H02M7/219 ,  H02M3/335 ,  H02M1/42

CPC分类号： H02M7/219 ,  H02M1/10 ,  H02M1/4208 ,  H02M1/4233 ,  H02M1/4241 ,  H02M3/3353 ,  H02M3/33592 ,  H02M3/337 ,  H02M7/217 ,  H02M2001/0058 ,  H02M2001/007

摘要： A hybrid rectifier that works as either a hybrid full bridge or a voltage doubler. Under 220 V AC input condition, the hybrid rectifier operates in full bridge mode, while at 110 V AC input, it operates as voltage doubler rectifier. The hybrid rectifier may be used with a DC-DC converter, such as an LLC resonant converter, in a power supply. With this mode switching, the LLC converter resonant tank design only takes consideration of 220 V AC input case, such that the required operational input voltage range is reduced, and the efficiency of the LLC converter is optimized. Both the size and power loss are reduced by using a single stage structure instead of the conventional two-stage configuration.

公开(公告)号：US20180108743A1

公开(公告)日：2018-04-19

申请号：US15783888

申请日：2017-10-13

申请人： Zhanming Li ,  Yue Fu ,  Wai Tung Ng ,  Yan-Fei Liu

发明人： Zhanming Li ,  Yue Fu ,  Wai Tung Ng ,  Yan-Fei Liu

IPC分类号： H01L29/417 ,  H01L29/40 ,  H01L29/778

CPC分类号： H01L29/41758 ,  H01L29/401 ,  H01L29/7786 ,  H01L31/022408 ,  H01L31/1085 ,  H01L33/20 ,  H01L33/38

摘要： This invention relates to interdigitated electrodes for power electronic and optoelectronic devices where field and current distribution determine the device performance. Described are geometries based on rounded asymmetrical fingers and electrode bases of varying width. Simulations demonstrate benefits for reducing self-heating and thermal power loss, which reduces overall on-state resistance and increases reverse break down voltages.

公开(公告)号：US09000120B2

公开(公告)日：2015-04-07

申请号：US13640887

申请日：2011-06-27

申请人： Ming Ming ,  Shaoguang Feng ,  Yan Fei Liu ,  Andreas Lutz ,  Robert D. Froese ,  Glenn G. Eagle ,  Gary L. Jialanella ,  Eric E. Cole ,  Michael R. Golden

发明人： Ming Ming ,  Shaoguang Feng ,  Yan Fei Liu ,  Andreas Lutz ,  Robert D. Froese ,  Glenn G. Eagle ,  Gary L. Jialanella ,  Eric E. Cole ,  Michael R. Golden

IPC分类号： C08G8/28 ,  C09J163/04 ,  C08G59/62 ,  C08G59/68 ,  C09J163/00 ,  C08L63/00 ,  C08L63/02

CPC分类号： C09J163/00 ,  C08G59/621 ,  C08G59/686 ,  C08L61/06 ,  C09J163/04

摘要： Epoxy adhesive compositions contain a heat-activatable catalyst. The heat-activatable catalyst includes a tertiary amine catalyst and a novolac resin that has a weight average molecular weight of at least 3000. One-component epoxy adhesive formulations that contain the heat-activatable catalyst have unexpectedly good storage stability.

摘要翻译： 环氧粘合剂组合物含有可热活化的催化剂。 可热活化的催化剂包括叔胺催化剂和重均分子量为至少3000的酚醛清漆树脂。含有可热活化催化剂的单组分环氧粘合剂制剂意外地具有良好的储存稳定性。

公开(公告)号：US08717717B2

公开(公告)日：2014-05-06

申请号：US13198178

申请日：2011-08-04

申请人： Hengchun Mao ,  Yan-Fei Liu ,  Renhua Wu

发明人： Hengchun Mao ,  Yan-Fei Liu ,  Renhua Wu

IPC分类号： H02H3/22

CPC分类号： H02M3/158 ,  H01R43/26 ,  H02H3/003 ,  H02H9/02 ,  H02H9/025 ,  H02M1/32 ,  H02M3/1582 ,  Y10T29/49117

摘要： An embodiment high efficiency power regulator comprises a three-terminal converter and a protection device. The three-terminal converter comprises a first terminal coupled to a positive terminal of an input voltage bus, a second terminal coupled to a positive terminal of an output voltage bus and a third terminal coupled to the protection device. The protection device comprises an inrush current limiting element connected in series with a reverse polarity protection device.

摘要翻译： 一个实施例的高效率功率调节器包括三端转换器和保护装置。 三端转换器包括耦合到输入电压总线的正端子的第一端子，耦合到输出电压总线的正端子的第二端子和耦合到保护装置的第三端子。 保护装置包括与反极性保护装置串联连接的浪涌电流限制元件。