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1. 发明申请

US20220190638A1 System to provide AC or DC power to electronic equipment 有权
公开(公告)号：US20220190638A1
公开(公告)日：2022-06-16
申请号：US17685330
申请日：2022-03-02
申请人： Ravisekhar Nadimpalli Raju
发明人： Ravisekhar Nadimpalli Raju
IPC分类号： H02J9/06
摘要： A system and method is provided to provide power to a load or electronic equipment which includes a multi-pole switch that connects the input of the load or electronic equipment to a first AC source or a DC source or an optional second AC source created from the DC source through a DC-AC converter. The connection to the DC source is either direct or through a DC-DC converter that provides voltage adjustment or isolation. A controller changes the position of the switch in response to the sensing of the presence and magnitude of the sources or in response to an external command to select a preferred source.

2. 发明申请

US20130322142A1 MULTILEVEL POWER CONVERTER 审中-公开
标题翻译：多功率转换器
公开(公告)号：US20130322142A1
公开(公告)日：2013-12-05
申请号：US13484517
申请日：2012-05-31
申请人： Ravisekhar Nadimpalli Raju
发明人： Ravisekhar Nadimpalli Raju
IPC分类号： H02M7/12 , H02M7/06
CPC分类号： H02M7/003 , H02M7/217 , H02M2007/4835
摘要： An AC-DC power converter is provided. The power converter includes an electrical terminal including a positive node and a negative node. The power converter also includes a first switch coupled across the positive node and the negative node and a second switch coupled in a reverse orientation relative to the first switch and in parallel to the first switch forming a first path and a second path. The power converter further includes a first electrical storage device situated in the first path and a second electrical storage device situated in the second path.
摘要翻译：提供一个AC-DC电源转换器。功率转换器包括一个包括正节点和负节点的电气终端。功率转换器还包括耦合在正节点和负节点之间的第一开关和相对于第一开关以相反方向耦合的第二开关，并且与形成第一路径和第二路径的第一开关并联。功率转换器还包括位于第一路径中的第一电存储装置和位于第二路径中的第二电存储装置。

3. 发明申请

US20120092898A1 ALTERNATING CURRENT TO DIRECT CURRENT POWER CONVERSION 有权
标题翻译：替代电流直接电流转换
公开(公告)号：US20120092898A1
公开(公告)日：2012-04-19
申请号：US13096005
申请日：2011-04-28
申请人： Ravisekhar Nadimpalli Raju , Luis Jose Garces , Robert Louis Steigerwald , Michael Joseph Schutten
发明人： Ravisekhar Nadimpalli Raju , Luis Jose Garces , Robert Louis Steigerwald , Michael Joseph Schutten
IPC分类号： H02M3/335
CPC分类号： H02M3/3376 , H02M1/4258 , H02M3/285 , H02M3/33561 , H02M3/33576 , Y02B70/126 , Y02B70/1433
摘要： An alternating current to direct current (AC to DC) power conversion system is provided. The system includes a rectifier configured to convert an input AC voltage to an initial pulsating DC voltage. The system also includes an inverter configured to convert the initial pulsating DC voltage to a converted AC voltage. The system further includes a plurality of transformers, each transformer including a primary winding paired to a secondary winding, wherein each of the primary windings is coupled in series with the other primary windings, wherein the series coupled primary windings are coupled to the inverter to receive respective portions of the converted AC voltage. The system also includes a plurality of bridges, each bridge coupled to a respective secondary winding configured to receive a respective portion of a transformed AC voltage from the respective secondary windings, and coupled in parallel to the other bridges to provide a combined DC output voltage.
摘要翻译：提供了直流（AC-DC）电力转换系统的交流电。该系统包括被配置为将输入AC电压转换为初始脉动直流电压的整流器。该系统还包括被配置为将初始脉动直流电压转换为转换的交流电压的逆变器。该系统还包括多个变压器，每个变压器包括与次级绕组成对的初级绕组，其中每个初级绕组与其它初级绕组串联耦合，其中串联耦合初级绕组耦合到逆变器以接收转换后的交流电压的各部分。该系统还包括多个桥，每个桥耦合到相应的次级绕组，其被配置为从相应的次级绕组接收变换的AC电压的相应部分，并联耦合到其它桥以提供组合的DC输出电压。

4. 发明申请

US20130343089A1 SCALABLE-VOLTAGE CURRENT-LINK POWER ELECTRONIC SYSTEM FOR MULTI-PHASE AC OR DC LOADS 审中-公开
标题翻译：用于多相交流或直流负载的可分级电流链路功率电子系统
公开(公告)号：US20130343089A1
公开(公告)日：2013-12-26
申请号：US13531629
申请日：2012-06-25
申请人： Ranjan Kumar Gupta , Ravisekhar Nadimpalli Raju , Rajib Datta , Mohammed Agamy
发明人： Ranjan Kumar Gupta , Ravisekhar Nadimpalli Raju , Rajib Datta , Mohammed Agamy
IPC分类号： H02M3/335
CPC分类号： H02M7/4807 , H02M7/487 , H02M7/49 , H02M2001/0074 , H02M2001/0077 , H02M2007/4818 , Y02B70/1441
摘要： An electronics power system includes a plurality of substantially identical power electronic modules. Each power electronic module includes a single-phase DC/AC inverter having an output side. Each power electronic module further includes a medium/high-frequency-isolated DC/DC current-to-voltage converter having an input side. The medium/high-frequency-isolated DC/DC current-to-voltage converter drives the single-phase DC/AC inverter. Each DC/DC converter and its corresponding DC/AC inverter are connected back-to-back sharing a common DC-link. The plurality of power electronics modules is stacked together in series at the input side and in parallel or series/parallel at the output side.
摘要翻译：电子电力系统包括多个基本相同的电力电子模块。每个电力电子模块包括具有输出侧的单相DC / AC逆变器。每个电力电子模块还包括具有输入侧的中/高频隔离DC / DC电流 - 电压转换器。中/高频隔离DC / DC电流 - 电压转换器驱动单相DC / AC逆变器。每个DC / DC转换器及其相应的DC / AC逆变器都背对背连接共享一个直流链路。多个电力电子模块在输入侧串联堆叠在一起，并且在输出侧并联或串联/并联。

5. 发明申请

US20110221195A1 SYSTEM AND METHOD FOR POWER CONVERSION 有权
标题翻译：用于功率转换的系统和方法
公开(公告)号：US20110221195A1
公开(公告)日：2011-09-15
申请号：US13075224
申请日：2011-03-30
申请人： Ravisekhar Nadimpalli Raju
发明人： Ravisekhar Nadimpalli Raju
IPC分类号： H02P9/04 , H02M7/48
CPC分类号： H02M7/49 , H02J3/386 , Y02E10/763 , Y10T307/707
摘要： A multilevel inverter is provided. The multilevel inverter includes a plurality of bridges, each bridge configured to receive a respective portion of an input DC power and convert the respective portion to a respective converted AC power. The multilevel inverter also includes at least one bridge controller for operating at least one of the plurality of bridges in a square waveform mode. The multilevel inverter further includes a plurality of transformers, each transformer coupled to a respective bridge and configured to increase a voltage level of the respective portion of converted AC power. The plurality of transformers further includes secondary windings coupled in series with the other secondary windings to combine the respective increased voltage level portions of the converted AC power. The multilevel inverter also includes a grid converter configured to provide output power for a power grid.
摘要翻译：提供多电平逆变器。多电平逆变器包括多个桥，每个桥被配置为接收输入DC电力的相应部分，并将相应部分转换成相应的转换AC电力。多电平逆变器还包括至少一个桥式控制器，用于以方波波形模式操作多个桥中的至少一个。多电平逆变器还包括多个变压器，每个变压器耦合到相应的桥并且被配置为增加转换的交流电力的相应部分的电压电平。多个变压器还包括与其它次级绕组串联耦合的次级绕组，以组合转换的AC电力的各个增加的电压电平部分。多电平逆变器还包括电网转换器，其配置成为电网提供输出功率。

6. 发明授权

US08379416B1 Power conversion system and method 失效
标题翻译：电力转换系统及方法
公开(公告)号：US08379416B1
公开(公告)日：2013-02-19
申请号：US13219961
申请日：2011-08-29
申请人： Rajib Datta , Ravisekhar Nadimpalli Raju
发明人： Rajib Datta , Ravisekhar Nadimpalli Raju
IPC分类号： H02J3/00
CPC分类号： H02M5/4505 , H02J3/1814 , H02J3/36 , H02M1/4216 , H02M5/451 , H02M7/49 , H02M2007/53876 , Y02B70/126 , Y02E40/18 , Y02E60/60
摘要： A power conversion system includes a power transformer for receiving AC power at a first voltage from an input side and for delivering AC power at a second voltage to an output side. A power converter is also included in the power conversion system wherein the power converter includes an input side converter on the input side and an output side converter on the output side coupled through a plurality of DC links. A converter controller in the power converter provides control signals to the input side converter and the output side converter for regulating an active power and a reactive power flow through the power converter. Each of the input side converters and the output side converters includes at least two power converter transformers coupled between respective power converter bridges coupled to the plurality of DC links and the input side or to the plurality of DC links and the output side.
摘要翻译：电力转换系统包括电力变压器，用于从输入侧接收来自第一电压的交流电力，并将第二电压的交流电输出到输出侧。功率转换器还包括在功率转换系统中，其中功率转换器包括输入侧的输入侧转换器和通过多个DC链路耦合的输出侧的输出侧转换器。功率转换器中的转换器控制器向输入侧转换器和输出侧转换器提供控制信号，用于调节有功功率和通过功率转换器的无功功率流。每个输入侧转换器和输出侧转换器包括耦合在耦合到多个DC链路和输入侧或多个DC链路和输出侧的各个功率转换器桥之间的至少两个功率转换变换器。

7. 发明申请

US20100014325A1 AC-AC CONVERTER WITH HIGH FREQUENCY LINK 有权
标题翻译：具有高频链路的AC-AC转换器
公开(公告)号：US20100014325A1
公开(公告)日：2010-01-21
申请号：US12173549
申请日：2008-07-15
申请人： Ravisekhar Nadimpalli Raju , Richard S. Zhang , Ljubisa Dragolijub Stevanovic , Jeffrey Neal Slotnick , Robert Louis Steigerwald , Luis Jose Garces
发明人： Ravisekhar Nadimpalli Raju , Richard S. Zhang , Ljubisa Dragolijub Stevanovic , Jeffrey Neal Slotnick , Robert Louis Steigerwald , Luis Jose Garces
IPC分类号： H02M5/45
CPC分类号： H02M5/458 , H02M5/271
摘要： An AC-AC Converter for an AC source which in one embodiment has a first rectifier section rectifying the AC source into a first pulsed DC link voltage signal and a high frequency modulating section coupled to the first pulsed DC link voltage signal and producing a high frequency AC voltage signal. A high frequency transformer is coupled to the high frequency AC voltage signal producing a transformed high frequency AC signal. There is a second rectifier section coupled to the transformed high frequency AC signal and producing a second pulsed DC voltage signal and an unfolder section coupled to the second pulsed DC voltage signal and producing an output AC signal.
摘要翻译：一种用于AC电源的AC-AC转换器，其在一个实施例中具有将AC源整流为第一脉冲DC链路电压信号的第一整流器部分和耦合到第一脉冲DC链路电压信号的高频调制部分，并产生高频交流电压信号。高频变压器耦合到产生变换的高频AC信号的高频AC电压信号。存在耦合到变换的高频AC信号并产生第二脉冲DC电压信号的第二整流器部分和耦合到第二脉冲DC电压信号并产生输出AC信号的非转储部分。

8. 发明授权

US07359223B2 Power converter system and method 有权
标题翻译：电源转换器系统及方法
公开(公告)号：US07359223B2
公开(公告)日：2008-04-15
申请号：US11095227
申请日：2005-03-30
申请人： Rajib Datta , Kunlun Chen , Haiqing Weng , Ravisekhar Nadimpalli Raju
发明人： Rajib Datta , Kunlun Chen , Haiqing Weng , Ravisekhar Nadimpalli Raju
IPC分类号： H02M7/00
CPC分类号： H02M7/49
摘要： A power converter system for supplying an output voltage is provided. The power converter system is adapted to operate in a normal mode and a fault mode. The system comprises a plurality of bridges and a plurality of transformers. The system further comprises a plurality of dc link capacitors, each coupled across a corresponding bridge. The system also includes a controller adapted for, during the normal mode, switching each bridge with a respective normal phase shift. During the fault mode, the controller is adapted for switching each of the remaining ones of the bridges with a respective adjusted phase shift to generate the output voltage. During the fault mode, at least one of the plurality of bridges is bypassed.
摘要翻译：提供了用于提供输出电压的功率转换器系统。电源转换器系统适用于正常模式和故障模式。该系统包括多个桥和多个变压器。该系统还包括多个直流链路电容器，每个直流链路电容器跨越相应的桥接器耦合。该系统还包括适于在正常模式期间用相应的正相移切换每个桥的控制器。在故障模式期间，控制器适于用相应调整的相移来切换桥接中的每一个，以产生输出电压。在故障模式期间，绕过多个桥中的至少一个。

9. 发明申请

US20210375533A1 Transformer with improved insulation structure 有权
公开(公告)号：US20210375533A1
公开(公告)日：2021-12-02
申请号：US17156959
申请日：2021-01-25
申请人： Ravisekhar Nadimpalli Raju
发明人： Ravisekhar Nadimpalli Raju
IPC分类号： H01F27/32
摘要： A transformer with improved insulation structure is provided which includes an insulating sheet separating the primary-side windings and portion of split magnetic core from the secondary-side windings and portion of split magnetic core. Thin layers of conductive and semiconductive material are deposited on areas of the insulating sheet surfaces facing the primary and secondary sides. These layers are electrically referenced or tied to the potentials of the respective primary or secondary sides. This ensures that the high electric field due to primary-to-secondary potential gradient is substantially placed across the insulating sheet dielectric and avoided in the air gaps or voids in the transformer, thus reducing undesirable partial discharge effects. The two core sections on the primary and secondary side are also electrically referenced or tied to the potentials of their adjacent windings, thus reducing high electric fields and partial discharge in the space between the core sections and the windings.

10. 发明申请

US20210132129A1 System and Method to Generate Multi-level Voltage Pulses for Electrical Insulation Testing 有权
公开(公告)号：US20210132129A1
公开(公告)日：2021-05-06
申请号：US17087616
申请日：2020-11-02
申请人： Ravisekhar Nadimpalli Raju
发明人： Ravisekhar Nadimpalli Raju
IPC分类号： G01R27/26 , G01R31/14
摘要： A system and method to generate high voltage pulses for testing of electrical insulation is presented. The system is comprised of multiple bridges in series that are connected across the insulation through an output inductor. The switching of the bridges are timed to allow a resonant half-cycle of current through the output inductor and the effective capacitance of the insulation which results in a transition of the voltage across the insulation from one level to another. The sequence of switching of the bridges is swapped intermittently such that the dc links of the bridges are substantially kept balanced. In one embodiment, only the dc link of the first bridge is supplied from an external source, while the other bridges are fed via the chain of series bridges from the first bridge through the switching operation of the circuit.

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