公开(公告)号：US20080002444A1

公开(公告)日：2008-01-03

申请号：US11480004

申请日：2006-06-30

申请人： Sampat Shekhawat ,  Ronald H. Randall ,  Donghye Cho

发明人： Sampat Shekhawat ,  Ronald H. Randall ,  Donghye Cho

IPC分类号： H02M7/217

CPC分类号： H02M1/34 ,  H02M1/4225 ,  Y02B70/126

摘要： In one embodiment, a power converter system includes a first input terminal and a second input terminal operable to connect to an alternating current (AC) power source, and an output terminal at which an output voltage can be provided to a load. A first inductor and a first diode are connected in series between the first input terminal and the output terminal. A second inductor and a second diode are connected in series between the second input terminal and the output terminal. A first switch is connected to the first inductor and the first diode, and a second switch is connected to the second inductor and the second diode. The first switch and the second switch alternately function as a boost switch and a synchronous rectifier for charging and discharging the first and second inductors during operation of the power converter system. An auxiliary network is operable to provide for zero voltage switching (ZVS) and zero current switching (ZCS) conditions for both the first and second switches during operation of the power converter system.

摘要翻译： 在一个实施例中，功率转换器系统包括可操作以连接到交流（AC）电源的第一输入端和第二输入端，以及输出端，输出电压可以被提供给负载。 第一电感器和第一二极管串联连接在第一输入端子和输出端子之间。 第二电感器和第二二极管串联连接在第二输入端子和输出端子之间。 第一开关连接到第一电感器和第一二极管，第二开关连接到第二电感器和第二二极管。 第一开关和第二开关交替地用作升压开关和用于在功率转换器系统的操作期间对第一和第二电感器进行充电和放电的同步整流器。 辅助网络可操作以在功率转换器系统的操作期间为第一和第二开关提供零电压开关（ZVS）和零电流切换（ZCS）条件。

公开(公告)号：US07518895B2

公开(公告)日：2009-04-14

申请号：US11480004

申请日：2006-06-30

申请人： Sampat Shekhawat ,  Ronald H. Randall ,  Donghye Cho

发明人： Sampat Shekhawat ,  Ronald H. Randall ,  Donghye Cho

IPC分类号： H02M7/219

CPC分类号： H02M1/34 ,  H02M1/4225 ,  Y02B70/126

摘要： In one embodiment, a power converter system includes a first input terminal and a second input terminal operable to connect to an alternating current (AC) power source, and an output terminal at which an output voltage can be provided to a load. A first inductor and a first diode are connected in series between the first input terminal and the output terminal. A second inductor and a second diode are connected in series between the second input terminal and the output terminal. A first switch is connected to the first inductor and the first diode, and a second switch is connected to the second inductor and the second diode. The first switch and the second switch alternately function as a boost switch and a synchronous rectifier for charging and discharging the first and second inductors during operation of the power converter system. An auxiliary network is operable to provide for zero voltage switching (ZVS) and zero current switching (ZCS) conditions for both the first and second switches during operation of the power converter system.

摘要翻译： 在一个实施例中，功率转换器系统包括可操作以连接到交流（AC）电源的第一输入端和第二输入端，以及输出端，输出电压可以被提供给负载。 第一电感器和第一二极管串联连接在第一输入端子和输出端子之间。 第二电感器和第二二极管串联连接在第二输入端子和输出端子之间。 第一开关连接到第一电感器和第一二极管，第二开关连接到第二电感器和第二二极管。 第一开关和第二开关交替地用作升压开关和用于在功率转换器系统的操作期间对第一和第二电感器进行充电和放电的同步整流器。 辅助网络可操作以在功率转换器系统的操作期间为第一和第二开关提供零电压开关（ZVS）和零电流切换（ZCS）条件。

公开(公告)号：US09030847B2

公开(公告)日：2015-05-12

申请号：US12884682

申请日：2010-09-17

申请人： Sampat Shekhawat ,  Myungbok Kim ,  Donghye Cho

发明人： Sampat Shekhawat ,  Myungbok Kim ,  Donghye Cho

IPC分类号： H02M3/335

CPC分类号： H02M3/33584 ,  Y02E10/56

摘要： An inverter and driving method of the inverter are disclosed. The inverter includes an active clamp forward (ACF) converter and a flyback converter. One of a forwarding operation of delivering current from a primary side to a secondary side by using the ACF converter and a backwarding operation of delivering current from the secondary side to the primary side by using the flyback converter is selected to generate a rectified AC.

摘要翻译： 公开了逆变器的逆变器和驱动方法。 逆变器包括有源钳位前馈（ACF）转换器和反激式转换器。 选择通过使用ACF转换器将电流从初级侧传送到次级侧的转发操作和通过使用反激转换器将电流从次级侧传送到初级侧的反向操作之一，以产生整流AC。

公开(公告)号：US07269038B2

公开(公告)日：2007-09-11

申请号：US11224167

申请日：2005-09-12

申请人： Sampat Shekhawat ,  Ronald H. Randall ,  Dong-Young Huh

发明人： Sampat Shekhawat ,  Ronald H. Randall ,  Dong-Young Huh

IPC分类号： H02M7/48

CPC分类号： H02M1/42 ,  H02M7/219 ,  Y02B70/12 ,  Y02P80/112

摘要： A synchronous full bridge rectifier is controlled to provide a power factor near unity. The full bridge rectifiers are transistors each with a controlling input. The AC input signal and currents within the circuit are sensed and sent to a controller. In response, the controller output control signals to turn on/off the rectifying MOSFETS on a timely basis to form a power factor of near one with respect to the AC input signal. The full wave rectifier is made of N-channel MOSFET's, some with fast body diodes. The MOSFET's are rectifiers and PFC control elements. The result is a one stage synchronous rectifier with PFC. A solid state precision analog differential amplifier senses the AC line waveform and high frequency current transformers sense the currents. The controller accepts the inputs of the amplifier and the sensed currents and outputs control signals that turn on and off the four MOSFET's. The timing of turning on/off is arranged so that the current drawn from the AC source is sinusoidal and matches the phase of the sinusoidal AC source.

摘要翻译： 控制同步全桥整流器以提供接近一致的功率因数。 全桥整流器是每个具有控制输入的晶体管。 AC输入信号和电路内的电流被检测并发送到控制器。 作为响应，控制器输出控制信号以及时地导通/关闭整流MOSFET，以形成相对于AC输入信号接近1的功率因数。 全波整流器由N沟道MOSFET制成，其中一些具有快速的体二极管。 MOSFET是整流器和PFC控制元件。 结果是具有PFC的单级同步整流器。 固态精密模拟差分放大器感测交流线路波形，高频电流互感器感应电流。 控制器接受放大器和感应电流的输入，并输出导通和关断四个MOSFET的控制信号。 布置开/关的时间，使得从AC源引出的电流是正弦的，并且与正弦AC电源的相位匹配。

公开(公告)号：US08942019B2

公开(公告)日：2015-01-27

申请号：US13286430

申请日：2011-11-01

申请人： Sampat Shekhawat ,  Myoungho Lee ,  Yongtaek Lee ,  Jacobo Aguillon-Garcia ,  Bongjoo Choi

发明人： Sampat Shekhawat ,  Myoungho Lee ,  Yongtaek Lee ,  Jacobo Aguillon-Garcia ,  Bongjoo Choi

IPC分类号： H02M7/5387 ,  H02M7/487 ,  H02M7/537 ,  H02M1/00

CPC分类号： H02M7/487 ,  H02M7/5388 ,  H02M2001/007

摘要： A multilevel inverter circuit includes an inverter control circuit that controls switching of main and neutral switches. The inverter control circuit receives current vector information indicating flow direction of an AC current output of the multilevel inverter circuit. The inverter control circuit eliminates dead time between switching of a neutral switch and a main switch depending on whether the AC current output is flowing towards a load or away from the load. Among other advantages, elimination of dead time improves the total harmonic distortion of the sinusoidal AC voltage output of the multilevel inverter circuit.

摘要翻译： 多电平逆变器电路包括控制主开关和中性开关的切换的逆变器控制电路。 逆变器控制电路接收指示多电平逆变器电路的交流电流输出的流向的电流矢量信息。 逆变器控制电路根据交流电流输出是否流向负载或远离负载，消除了中性点开关和主开关的切换之间的死区时间。 除了其他优点之外，消除死区时间提高了多电平逆变器电路的正弦交流电压输出的总谐波失真。

公开(公告)号：US07834597B1

公开(公告)日：2010-11-16

申请号：US12229543

申请日：2008-08-25

申请人： Sampat Shekhawat

发明人： Sampat Shekhawat

IPC分类号： G05F1/613

CPC分类号： H02M5/293 ,  H02M1/32 ,  H02M2001/342 ,  Y02B70/1491

摘要： In an embodiment, a power converter system is provided for AC voltage regulation. The power converter system receives an AC input voltage at an input terminal and provides an AC output voltage to a load at an output terminal. A main bi-directional switch is coupled between the input terminal and the output terminal. The main bi-directional switch is operable to control the provision of the AC output voltage. A reactive current flows through the main bi-directional switch if the load is reactive. An auxiliary bi-directional switch is coupled to the output terminal. The auxiliary bi-directional switch is operable to circulate the reactive current due to the reactive load, thereby reducing any voltage spikes in the power converter system.

摘要翻译： 在一个实施例中，提供用于AC电压调节的功率转换器系统。 功率转换器系统在输入端接收AC输入电压，并将AC输出电压提供给输出端的负载。 主要的双向开关耦合在输入端和输出端之间。 主要双向开关可用于控制AC输出电压的提供。 如果负载是反应的，无功电流流过主双向开关。 辅助双向开关耦合到输出端子。 辅助双向开关可操作以由于无功负载而使无功电流循环，从而减小功率转换器系统中的任何电压尖峰。

公开(公告)号：US5550456A

公开(公告)日：1996-08-27

申请号：US281387

申请日：1994-07-27

申请人： Sampat Shekhawat ,  Eli Liebermann ,  William M. Scherzinger ,  Gayton L. Silvestro ,  Nick Suttora ,  David Hodge

发明人： Sampat Shekhawat ,  Eli Liebermann ,  William M. Scherzinger ,  Gayton L. Silvestro ,  Nick Suttora ,  David Hodge

IPC分类号： H02P9/30 ,  H02P9/00

CPC分类号： H02P9/305 ,  H02P2101/30

摘要： A control scheme for a wound rotor synchronous generator whereby feedback signals corresponding to the exciter field current and the generator output voltage potential combine together to control the generator output voltage in such a way that at lower generator speeds and lower load requirements, exciter field current saturation is eliminated by reducing generator output voltage. The generator control scheme includes a circuit for sensing exciter field current in logic cooperation with a circuit for sensing generator voltage. Both sensing circuits regulate the current applied to the exciter field which corresponds to the rectified current applied to the field windings of the power generator. During steady state operations the generator output voltage is regulated using the generator output voltage as a feedback signal. At lower speeds and reduced loads and as the exciter field current approaches the saturation point, the generator output voltage is regulated using the exciter field current as a feedback signal.

摘要翻译： 一种用于绕组转子同步发电机的控制方案，其中对应于励磁机励磁电流和发电机输出电压电位的反馈信号组合在一起以控制发电机输出电压，使得在较低的发电机转速和较低的负载要求下，励磁机励磁电流饱和 通过减少发电机输出电压来消除。 发电机控制方案包括用于感测与用于感测发电机电压的电路逻辑协作的激励器励磁电流的电路。 两个感测电路调节施加到激励器电场的电流，其对应于施加到发电机的励磁绕组的整流电流。 在稳态运行期间，使用发电机输出电压作为反馈信号来调节发电机输出电压。 在较低的速度和降低的负载下，随着励磁电流的电流接近饱和点，发电机输出电压使用激励器励磁电流作为反馈信号进行调节。

公开(公告)号：US5402083A

公开(公告)日：1995-03-28

申请号：US73027

申请日：1993-06-07

申请人： Sampat Shekhawat ,  Robert C. Eckenfelder

发明人： Sampat Shekhawat ,  Robert C. Eckenfelder

IPC分类号： H02M1/00 ,  H02M1/38 ,  H02M7/48 ,  H02M7/487 ,  H03L7/16

CPC分类号： H02M7/487 ,  H02M1/38

摘要： This invention provides for an enabling circuit that ensures a positive turn-on of semiconductor switches configured for the generation of a synthesized waveform, thereby eliminating misfiring of the switches due to electronic noise or logic malfunction. The circuit is configured to separately compare a sample waveform with a positive reference voltage and a negative reference voltage. The two results are directed to separate logic AND gates which have respective control signal inputs that regulate the formation of the positive and negative portion of a synthesized waveform. The output signals from the two AND gates connect to logic means to control the firing of the semiconductor switches.

摘要翻译： 本发明提供了一种使能电路，其确保配置用于产生合成波形的半导体开关的正导通，从而消除由于电子噪声或逻辑故障引起的开关的点火。 该电路被配置为分别将采样波形与正参考电压和负参考电压进行比较。 这两个结果针对具有调节合成波形的正和负部分的形成的各个控制信号输入的分离逻辑与门。 来自两个与门的输出信号连接到逻辑装置以控制半导体开关的点火。

公开(公告)号：US08503146B1

公开(公告)日：2013-08-06

申请号：US12253014

申请日：2008-10-16

申请人： Sampat Shekhawat

发明人： Sampat Shekhawat

IPC分类号： H02H9/08

CPC分类号： H03K17/0812 ,  H03K2217/0045

摘要： According to one embodiment, a power supply system includes a switching device operable to be turned on and off for causing power to be delivered to a load. The switching device has a control terminal. Driver circuitry, coupled to the control terminal of the switching device, is operable to drive the switching device. The driver circuitry further operable to detect a fault condition in the power supply system. If the switching device is turned on when the fault condition is detected, the driver circuitry reduces the voltage at the control terminal of the switching device to a level just above the threshold voltage for the switching device, and holds the voltage at the control terminal to the level just above the threshold voltage for a controlled duration, thereby reducing the saturation current flowing through the switching device. The driver circuitry further reduces the voltage at the control terminal of the switching device after the controlled duration, thereby safely turning off the switching device.

摘要翻译： 根据一个实施例，电源系统包括可操作以打开和关闭以切换电力以将功率传送到负载的开关装置。 开关装置具有控制端子。 耦合到开关装置的控制端子的驱动器电路可操作以驱动开关装置。 驱动器电路还可操作以检测电源系统中的故障状况。 如果在检测到故障状态时开关装置被接通，则驱动电路将开关装置的控制端的电压降低到刚好高于开关装置的阈值电压的电平，并将控制端的电压保持在 该电平刚好高于阈值电压以控制持续时间，从而减少流过开关器件的饱和电流。 驱动器电路进一步降低了在受控持续时间之后开关装置的控制端的电压，从而安全地关闭了开关装置。

公开(公告)号：US08023295B1

公开(公告)日：2011-09-20

申请号：US12217244

申请日：2008-07-02

申请人： Sampat Shekhawat ,  Myungbok Kim ,  Dong-Hye Cho

发明人： Sampat Shekhawat ,  Myungbok Kim ,  Dong-Hye Cho

IPC分类号： H02M3/335 ,  H02H7/122

CPC分类号： H02J3/383 ,  H02M7/4807 ,  Y02E10/563

摘要： In one embodiment, a power converter system comprises an input terminal operable to connect to a DC power source and an output terminal at which an output voltage can be provided. An active clamped forward converter is operable to provide forward power flow from the DC power source to the output terminal. A flyback converter is operable to provide backward power flow from the output terminal to the DC power source. The active clamped forward converter and the flyback converter cooperate to generate a rectified sinusoidal waveform at the output terminal.

摘要翻译： 在一个实施例中，功率转换器系统包括可操作以连接到DC电源的输入端子和可以提供输出电压的输出端子。 有源钳位正激转换器可操作以提供从DC电源向输出端子的正向功率流。 反激转换器可操作以提供从输出端子到DC电源的反向功率流。 有源钳位正激转换器和反激转换器协作在输出端产生整流正弦波形。