公开(公告)号：US20120063175A1

公开(公告)日：2012-03-15

申请号：US13228268

申请日：2011-09-08

申请人： Dong WANG ,  Yan-Fei LIU

发明人： Dong WANG ,  Yan-Fei LIU

IPC分类号： H02M3/335

CPC分类号： H02M3/33592 ,  H03K17/133 ,  H03K17/161 ,  Y02B70/1433 ,  Y02B70/1475

摘要： Provided are circuits and methods for driving the synchronous rectifier (SR) of a power converter. A non-linear voltage sense compensator is applied across the drain and source of the SR, and a sense signal is provided to the SR driver sense input, such that false triggering of the SR is effectively eliminated. In addition, the voltage sense compensator ensures that the SR is turned on as soon as its current starts to flow and is turned off when its current falls to zero. The embodiments described herein may be incorporated into new VR designs, or they may be used to improve the SR driving characteristics of commercially available voltage sensing SR drivers.

摘要翻译： 提供了用于驱动功率转换器的同步整流器（SR）的电路和方法。 在SR的漏极和源极之间施加非线性电压感测补偿器，并且向SR驱动器感测输入提供感测信号，从而有效地消除了SR的错误触发。 此外，电压检测补偿器确保SR一旦其电流开始流动就导通，当电流下降到零时关闭。 本文描述的实施例可以并入新的VR设计中，或者它们可以用于改善市售的电压感测SR驱动器的SR驱动特性。

公开(公告)号：US20200235656A1

公开(公告)日：2020-07-23

申请号：US16744166

申请日：2020-01-15

申请人： Yan-Fei LIU

发明人： Mojtaba Forouzesh ,  Xiang Zhou ,  Yan-Fei LIU

IPC分类号： H02M1/42 ,  H02M1/08 ,  H02J7/02 ,  H02M3/335 ,  H02M1/00 ,  B60L53/00

摘要： Three-phase single-stage AC-DC converters achieve power factor correction with low phase voltage switch stress. Direct input current sensing is performed to calculate the average input current of the AC-DC converter and implement power factor correction. Embodiments feature high power factor, single stage power conversion, and soft-switching of all switches, resulting in high conversion efficiency in a cost-effective single-stage three-phase structure. The converters have low output voltage ripple without a double line frequency component, which allows non-electrolytic capacitor implementation. The converters are particularly useful in high-power applications such as electric vehicle charging.

公开(公告)号：US20220103083A1

公开(公告)日：2022-03-31

申请号：US17425574

申请日：2020-01-24

申请人： Xiang ZHOU ,  Wenbo LIU ,  Bo SHENG ,  Yang CHEN ,  Andrew YUREK ,  Yan-Fei LIU ,  Lakshmi Varaha IYER ,  Gerd SCHLAGER ,  Michael NEUDORFHOFER ,  Wolfgang BAECK ,  MAGNA INTERNATIONAL INC.

发明人： Xiang ZHOU ,  Wenbo LIU ,  Bo SHENG ,  Yang CHEN ,  Andrew YUREK ,  Yan-Fei LIU ,  Lakshmi Varaha IYER ,  Gerd SCHLAGER ,  Michael NEUDORFHOFER ,  Wolfgang BAECK

IPC分类号： H02M3/335 ,  H02M1/44 ,  H02M1/08 ,  B60L53/20

摘要： An LLC power converter comprises a switching stage and a resonant tank, the switching stage configured to switch an input power at a switching frequency to apply a switched power to the resonant tank, and the resonant tank includes a resonant inductor, a resonant capacitor, and a parallel inductance. A transformer has a primary winding connected to the resonant tank and a secondary winding. A synchronous rectifier (SR) switch is configured to selectively switch current from the secondary winding to supply a rectified current to a load. An RC filter includes a filter capacitor and a filter resistor connected across the SR switch, with the filter capacitor defining a filter capacitor voltage thereacross. A rectifier driver is configured to drive the SR switch to a conductive state in response to the filter capacitor voltage being less than a threshold value.

公开(公告)号：US20220094272A1

公开(公告)日：2022-03-24

申请号：US17425656

申请日：2020-01-24

申请人： Wenbo LIU ,  Yang CHEN ,  Xiang ZHOU ,  Andrew YUREK ,  Mojtaba FOROUZESH ,  Bo SHENG ,  Sam WEBB ,  Yan-fei LIU ,  Lakshmi Varaha IYER ,  Gerd SCHLAGER ,  Michael NEUDORFHOFER ,  Wolfgang BAECK ,  MAGNA INTERNATIONAL INC.

发明人： Wenbo LIU ,  Yang CHEN ,  Xiang ZHOU ,  Andrew YUREK ,  Mojtaba FOROUZESH ,  Bo SHENG ,  Sam WEBB ,  Yan-Fei LIU ,  Lakshmi Varaha IYER ,  Gerd SCHLAGER ,  Michael NEUDORFHOFER ,  Wolfgang BAECK

IPC分类号： H02M3/335 ,  H01F27/28 ,  H01F27/40 ,  H01F30/10 ,  H02M7/48

摘要： An inductor-inductor-capacitor (EEC) power converter with high efficiency for Electric Vehicle (EV) on-board low voltage DC-DC chargers (LDC) is disclosed. The converter includes a switching bridge with a plurality of bridge switches and configured to generate an output from a direct current input voltage. An EEC tank circuit is coupled to the switching bridge and includes a resonant inductor and a resonant capacitor and a parallel inductor connected between the resonant inductor and the resonant capacitor. The tank circuit is configured to output a resonant sinusoidal current from the output of the switching bridge. At least one transformer has at least one primary winding in parallel with the parallel inductor of the inductor-inductor-capacitor tank circuit and at least one secondary winding. At least one rectifier is coupled to the at least one secondary winding and is configured to output a rectified alternating current.

公开(公告)号：US20190058416A1

公开(公告)日：2019-02-21

申请号：US15770493

申请日：2017-03-17

申请人： Hongliang WANG ,  Yan-Fei LIU

发明人： Hongliang WANG ,  Yan-Fei LIU

IPC分类号： H02M7/487 ,  H02M7/537 ,  H02S40/32

CPC分类号： H02M7/487 ,  H02M7/48 ,  H02M7/537 ,  H02S40/32 ,  Y02E10/56

摘要： A single-phase five-level active clamping converter unit and a converter. The single-phase five-level active clamping converter unit has three input ends and one output end, and also comprises: a suspension capacitor and a topological control portion. The topological control portion is connected to the suspension capacitor and the three input ends and one output end of the single-phase five-level active clamping converter unit, is connected to a plurality of control ends, and is suitable for the supply of at least eight operating modes under the control of a control signal accessing the control ends. In the single-phase five-level active clamping converter unit, a topological structure is easy to design, and is simple and convenient to control.

公开(公告)号：US20130318366A1

公开(公告)日：2013-11-28

申请号：US13481073

申请日：2012-05-25

申请人： Hengchun MAO ,  Yan-Fei LIU

发明人： Hengchun MAO ,  Yan-Fei LIU

IPC分类号： G05F3/02 ,  G06F1/26

CPC分类号： G05F3/02 ,  G06F1/26

摘要： Dual frequency control of first and second pairs of switches of a buck-boost regulator with pass through band is disclosed. In buck and boost modes respectively a first pair of the switches is operated at high frequency and a second pair of the switches is operated at low frequency. In pass through mode, both pairs of switches are operated at low frequency. Dual frequency control and operation of the pairs of switches enables current sharing between positive and negative power leads in buck, boost and pass-through modes.

摘要翻译： 公开了具有通过带的降压 - 升压调节器的第一和第二对开关的双频率控制。 在降压和升压模式下，第一对开关以高频工作，第二对开关以低频工作。 在通过模式下，两对开关都以低频工作。 两对开关的双频率控制和操作可以在降压，升压和直通模式下实现正负电源线之间的电流共享。

公开(公告)号：US20120068683A1

公开(公告)日：2012-03-22

申请号：US13234241

申请日：2011-09-16

申请人： Yan-Fei LIU ,  Zhiliang ZHANG ,  Jizhen FU

发明人： Yan-Fei LIU ,  Zhiliang ZHANG ,  Jizhen FU

IPC分类号： G05F3/08

CPC分类号： H02M1/08

摘要： Described herein are methods and circuits for driving a power switching device of a power converter. The methods and circuits include providing a negative gate to source voltage to the power switching device during an off transition of the power switching device, wherein the negative gate to source voltage is provided independent of one or more switching element for driving the power switching device; wherein body diode conduction by the one or more switching element is mitigated; wherein a circuit connected in parallel with the gate and source of the power switching device is used to set or define the negative gate to source voltage.

摘要翻译： 这里描述了用于驱动功率转换器的功率开关装置的方法和电路。 所述方法和电路包括在功率开关器件的断开转换期间向功率开关器件提供负栅极至源极电压，其中负栅极至源极电压独立于用于驱动功率开关器件的一个或多个开关元件而提供; 其中通过所述一个或多个开关元件的体二极管导通被减轻; 其中使用与电源开关器件的栅极和源极并联连接的电路来设置或限定负栅极到源极电压。