公开(公告)号：US20150367049A1

公开(公告)日：2015-12-24

申请号：US14308177

申请日：2014-06-18

Applicant: Keming Chen ,  Chen Chen ,  Frank Lin

Inventor： Keming Chen ,  Chen Chen ,  Frank Lin

IPC: A61M1/12 ,  A61M1/10

CPC classification number: A61M1/122 ,  A61M1/101 ,  A61M1/1015 ,  A61M1/1031 ,  A61M1/1086 ,  A61M1/127

Abstract: An implantable blood pump includes motor control circuitry and power electronics circuitry integrated within the implantable pump body. The motor control circuitry and power electronics circuitry is configured to energize and control motor windings to rotate the pump rotor and impeller. Additional control circuitry and power electronics circuitry may be integrated within the pump housing to energize and control magnetic bearings of a magnetic levitation pump. A percutaneous cable coupled between the implantable blood pump and an extracorporeal monitor includes a reduced number of leads to provide power and control signals to the implantable blood pump. Wireless communication between the extracorporeal monitor and the integrated power electronics and control circuitry facilitates the use of a percutaneous cable with as few as two leads for providing power to the implantable pump.

Abstract translation: 可植入血液泵包括集成在可植入泵体内的马达控制电路和电力电子电路。 电动机控制电路和电力电子电路被配置为激励和控制电动机绕组以使泵转子和叶轮旋转。 附加的控制电路和电力电子电路可以集成在泵壳体内以激励和控制磁悬浮泵的磁轴承。 耦合在可植入血液泵和体外监测器之间的经皮电缆包括减少数量的引线以向可植入血液泵提供功率和控制信号。 体外监测器和集成电力电子和控制电路之间的无线通信有助于使用具有少至两个引线的经皮电缆，以向可植入泵提供电力。

公开(公告)号：US07768807B2

公开(公告)日：2010-08-03

申请号：US11748106

申请日：2007-05-14

Applicant: Keming Chen ,  Steven E. Schulz

Inventor： Keming Chen ,  Steven E. Schulz

IPC: H02M7/217

CPC classification number: H02M1/32 ,  H02M3/33576 ,  H02M3/3378

Abstract: A method of operating an isolated bi-directional dc/dc converter to provide voltage regulation at a no-load condition over a wide voltage range and also provide overshoot protection for the boost mode main switching transistors uses new boost mode drive waveforms. The new waveforms drive switches S2 and S4 to be turned off during boost mode and only S1 and S3 are switched to provide reverse energy flow at no-load. In boost mode, C1 and C2 provide overshoot protection caused by leakage inductance of the isolation transformer when boost mode drive transistors turn off during forward energy flow and provide stored energy for reverse energy flow during reverse energy flow periods used for voltage regulation in the boost mode. In buck mode, C1 and C2 provide soft switching for buck mode main switching transistors S2 and S4.

Abstract translation: 一种隔离双向dc / dc转换器的运行方式，可在宽电压范围内的无负载状态下提供电压调节，并为升压模式主开关晶体管提供过冲保护，采用新的升压模式驱动波形。 新的波形驱动开关S2和S4在升压模式下关闭，只有S1和S3被切换以在空载时提供反向能量流。 在升压模式下，当升压模式驱动晶体管在正向能量流动期间关闭时，C1和C2提供由隔离变压器的漏感引起的过冲保护，并在用于升压模式下的电压调节的反向能量流期间提供反向能量流的存储能量 。 在降压模式下，C1和C2为降压模式主开关晶体管S2和S4提供软开关。

公开(公告)号：US07705576B2

公开(公告)日：2010-04-27

申请号：US11263220

申请日：2005-10-31

Applicant: Keming Chen

Inventor： Keming Chen

IPC: G05F1/00

CPC classification number: H02M3/1584

Abstract: A current mode control circuit uses a current comparing module to control a switching signal according to one of a plurality of current feedback signals. The current mode circuit comprises a voltage control module that generates an output voltage according to an input voltage and the switching control signal, and that generates the plurality of current feedback signals. The current comparing module outputs a control current signal that is indicative of a greater one of the plurality of current feedback signals. A current mode control module receives the control current signal and generates the switching control signal according to the control current signal.

Abstract translation: 电流模式控制电路使用电流比较模块根据多个电流反馈信号之一来控制开关信号。 电流模式电路包括电压控制模块，其根据输入电压和开关控制信号产生输出电压，并且产生多个电流反馈信号。 电流比较模块输出指示多个电流反馈信号中较大一个的控制电流信号。 电流模式控制模块接收控制电流信号并根据控制电流信号产生开关控制信号。

公开(公告)号：US20100001824A1

公开(公告)日：2010-01-07

申请号：US12217424

申请日：2008-07-05

Applicant: Keming Chen ,  Mike Kirkland ,  Michael A. Quan

Inventor： Keming Chen ,  Mike Kirkland ,  Michael A. Quan

IPC: H01F5/00

CPC classification number: H01F30/02 ,  H01F27/22 ,  H01F27/2804

Abstract: An autotransformer for use in low frequency, high power applications that uses a stack of printed wire boards constructed of a top, inner, and bottom layer including electrical trace windings circumventing the transformer core and formed in the inner layer for direct thermal contact with a heat sink interface providing a uniform and consistent heat path down to the heat sink plate. The autotransformer further includes a board to board connection employing solder cups to electrically connect between predetermined printed wire board traces. The printed wire board autotransformer also may use a non-planar interface for thermal interface with a non-planar heat sink plate surface.

公开(公告)号：US07586760B2

公开(公告)日：2009-09-08

申请号：US11959003

申请日：2007-12-18

Applicant: Keming Chen

Inventor： Keming Chen

IPC: H02M3/335 ,  H02H7/122

CPC classification number: H02M3/33576 ,  H02M2001/0032 ,  H02M2001/342 ,  Y02B70/1491 ,  Y02B70/16

Abstract: A DC-to-DC converter and associated methods are provided for controlling the discharge of snubber capacitances during a light/no load buck mode of operation. An operating method for a DC-to-DC converter detects conditions corresponding to a light/no load buck mode of operation, and, in response to the detection of that mode, controls the states of a first switch, a second switch, a first switched diode element, a second switched diode element, a third switched diode element, and a fourth switched diode element to facilitate discharging of a first capacitance element and a second capacitance element through a secondary winding of a transformer.

Abstract translation: 提供DC-DC转换器和相关联的方法用于在轻/无负载降压操作模式期间控制缓冲电容的放电。 用于DC-DC转换器的操作方法检测与轻/无负载降压操作模式相对应的条件，并且响应于该模式的检测，控制第一开关，第二开关，第一 开关二极管元件，第二开关二极管元件，第三开关二极管元件和第四开关二极管元件，以便于通过变压器的次级绕组放电第一电容元件和第二电容元件。

公开(公告)号：US20070096705A1

公开(公告)日：2007-05-03

申请号：US11263220

申请日：2005-10-31

Applicant: Keming Chen

Inventor： Keming Chen

IPC: G05F1/00

CPC classification number: H02M3/1584

Abstract: A current mode control circuit uses a current comparing module to control a switching signal according to one of a plurality of current feedback signals. The current mode circuit comprises a voltage control module that generates an output voltage according to an input voltage and the switching control signal, and that generates the plurality of current feedback signals. The current comparing module outputs a control current signal that is indicative of a greater one of the plurality of current feedback signals. A current mode control module receives the control current signal and generates the switching control signal according to the control current signal.

Abstract translation: 电流模式控制电路使用电流比较模块根据多个电流反馈信号之一来控制开关信号。 电流模式电路包括电压控制模块，其根据输入电压和开关控制信号产生输出电压，并且产生多个电流反馈信号。 电流比较模块输出指示多个电流反馈信号中较大一个的控制电流信号。 电流模式控制模块接收控制电流信号并根据控制电流信号产生开关控制信号。

公开(公告)号：US20060002156A1

公开(公告)日：2006-01-05

申请号：US10881213

申请日：2004-06-30

Applicant: Keming Chen ,  Lateef Kajouke ,  James Lazar

Inventor： Keming Chen ,  Lateef Kajouke ,  James Lazar

IPC: H02M3/335

CPC classification number: H02M3/28 ,  H02M3/33569

Abstract: A DC-DC converter comprises an input circuit that stores inductive energy that includes a first switch that releases the stored inductive energy. A transformer includes a primary winding that communicates with the input circuit and a secondary winding. An output circuit communicates with the secondary winding and that includes first and second output conductors and a first diode that communicates with one end of the secondary winding and the first output conductor. A second diode communicates with one end of the secondary winding and the second output conductor. A third diode communicates with an opposite end of the secondary winding and the first output conductor. A fourth diode communicates with an opposite end of the secondary winding and the second output conductor. A first capacitor is connected in parallel to the third diode. A second capacitor is connected in parallel to the fourth diode.

公开(公告)号：US5235501A

公开(公告)日：1993-08-10

申请号：US733168

申请日：1991-07-19

Applicant: Thomas A. Stuart ,  Keming Chen

Inventor： Thomas A. Stuart ,  Keming Chen

IPC: H02M3/337 ,  H03K17/00 ,  H03K17/0814

CPC classification number: H02M3/3376 ,  H03K17/08146 ,  H03K17/08148 ,  H03K2217/0036

Abstract: A full bridge DC to DC converter which provides zero voltage switching (ZVS) for one leg of the bridge and zero current switching (ZCS) for the other leg of the bridge is described. ZVS is achieved with parallel capacitors, while ZCS is achieved by using the reverse breakdown characteristics of the various diode and switching devices. This technique provides a significant reduction in the switching losses of the switching devices, which allows for higher power and frequency combinations.

Abstract translation: 描述了为桥的一条支路提供零电压开关（ZVS）和桥的另一端的零电流开关（ZCS）的全桥DC到DC转换器。 ZVS采用并联电容实现，而ZCS通过使用各种二极管和开关器件的反向击穿特性来实现。 该技术显着降低了开关器件的开关损耗，这允许更高的功率和频率组合。

公开(公告)号：US09360547B2

公开(公告)日：2016-06-07

申请号：US13436029

申请日：2012-03-30

Applicant: Aitan Ameti ,  Keming Chen ,  Robert J. Fontana ,  Edward A. Richley ,  Belinda Turner

Inventor： Aitan Ameti ,  Keming Chen ,  Robert J. Fontana ,  Edward A. Richley ,  Belinda Turner

IPC: G01S5/02 ,  G01S5/06 ,  G01S5/10

CPC classification number: G01S5/06 ,  G01S5/021 ,  G01S5/0221 ,  G01S5/10

Abstract: An ultra wideband (UWB) or short-pulse RF system is disclosed that can be used to precisely locate or track objects (such as personnel, equipment, assets, etc.) in real-time in an arbitrarily large, physically connected or disconnected, multipath and/or noisy environment. A system implementation includes multiple zones or groups of receivers that receives RF signals transmitted by one or more timing reference tags and one or more objects having associated object tags. Each zone or group may share a common receiver. By combining a multiple reference tag system with a virtual group of receivers, i.e., a zoning technique or system, a cost-effective system can be provided that offers scalability and flexibility to monitor a significantly expanded coverage area.

Abstract translation: 公开了一种超宽带（UWB）或短脉冲RF系统，其可用于在任意大的物理连接或断开的情况下实时地精确定位或跟踪物体（例如人员，设备，资产等） 多路径和/或噪声环境。 系统实现包括接收器的多个区域或组，其接收由一个或多个定时参考标签和具有相关联的对象标签的一个或多个对象发送的RF信号。 每个区域或组可以共享公共接收器。 通过将多个参考标签系统与虚拟接收机组即分区技术或系统组合，可以提供具有成本效益的系统，其提供可扩展性和灵活性来监视显着扩展的覆盖区域。

公开(公告)号：US20120086607A1

公开(公告)日：2012-04-12

申请号：US13270061

申请日：2011-10-10

Applicant: Aitan Ameti ,  Keming Chen ,  Robert J. Fontana ,  Edward A. Richley ,  Belinda Turner

Inventor： Aitan Ameti ,  Keming Chen ,  Robert J. Fontana ,  Edward A. Richley ,  Belinda Turner

IPC: G01S5/02

CPC classification number: G01S5/021 ,  G01S5/0009 ,  G01S5/14

Abstract: Various methods and apparatuses that utilize a wireless time reference system are provided herein. One example method involves calibrating independent, spatially-located clocks of a geoposition system in order to geolocate an object having an associated object tag. The example method may include transmitting an RF pulse pair, receiving the pulse pair at multiple locations, utilizing respective frequencies of first and second spatially-located clocks to produce count values to effect measurement of an interarrival interval at each of multiple locations, determining a ratio of count values relative to said first and second spatially-located clocks, and utilizing said ratio to calibrate time indications of said clocks. Other related methods and apparatus are also provided.

Abstract translation: 本文提供了利用无线时间基准系统的各种方法和装置。 一个示例性方法包括校准地理位置系统的独立的，位于空间上的时钟，以便对具有相关联的对象标签的对象进行地理定位。 示例性方法可以包括发射RF脉冲对，利用第一和第二空间位置时钟的相应频率在多个位置处接收脉冲对，以产生计数值，以在多个位置的每个位置处测量间隔间隔，确定比率 相对于所述第一和第二空间位置的时钟的计数值，并且利用所述比率来校准所述时钟的时间指示。 还提供了其他相关方法和装置。