公开(公告)号：US20160294292A1

公开(公告)日：2016-10-06

申请号：US15085012

申请日：2016-03-30

申请人： Virginia Tech Intellectual Properties, Inc.

发明人： Xiucheng Huang ,  Fred C. Lee ,  Qiang Li

IPC分类号： H02M3/335 ,  H02M1/44 ,  H02M1/42

CPC分类号： H02M3/33592 ,  H02M1/08 ,  H02M1/44 ,  H02M2001/0048 ,  Y02B70/1475

摘要： A voltage waveform similar to a waveform of a magnetizing current of an isolation transformer and immune to high frequency oscillatory resonant behavior is developed across a capacitor of a series resistor and capacitor connection connected in parallel with a synchronous rectifier. A simple logic circuit produces a waveform for controlling the synchronous rectifier which is not subject to significant turn on delay or early turn off caused by oscillatory resonances among parasitic inductances and capacitances. Improved timing accuracy of a synchronous converter provides improved power converter accuracy, particularly for flyback converters which are commonly used in converters for supplying power to offline electrical device but are subject to oscillatory resonant behaviors that cannot be adequately damped at switching frequencies sufficiently high to support miniaturization of adapters.

摘要翻译： 在与同步整流器并联连接的串联电阻器和电容器连接的电容器上形成类似于隔离变压器的励磁电流波形并且不受高频振荡谐振特性影响的电压波形。 简单的逻辑电路产生用于控制同步整流器的波形，其不受由寄生电感和电容之间的振荡谐振引起的明显的导通延迟或早期关断。 同步转换器的提高的定时精度提供了改进的功率转换器精度，特别是对于通常用于向离线电气设备供电的转换器中的回扫转换器，但是受到振荡谐振行为的影响，该振荡谐振行为在足够高的开关频率下不能被充分地抑制以支持小型化 的适配器。

公开(公告)号：US09847710B2

公开(公告)日：2017-12-19

申请号：US15085225

申请日：2016-03-30

申请人： Virginia Tech Intellectual Properties, Inc.

发明人： Fred C. Lee ,  Xiucheng Huang ,  Qiang Li

IPC分类号： H02M3/335 ,  H02M1/42 ,  H02M1/44 ,  H02M1/00

CPC分类号： H02M1/4258 ,  H02M1/44 ,  H02M3/33592 ,  H02M2001/0058 ,  Y02B70/126 ,  Y02B70/1433 ,  Y02B70/1475 ,  Y02B70/1491

摘要： A two-stage power converter architecture including an isolation transformer and rectification of the isolation transformer output by an LLC resonant circuit and methodology for operating the same feeds an output voltage back to a circuit for generating waveforms for controlling a totem pole circuit to provide output voltage regulation as well as rectification of AC input voltage. The circuit for controlling the totem pole circuit may also be responsive to the AC input power waveform to provide power factor correction (PFC), in which case, the feedback signal provides additional pulse width modulation of the PFC signals. Bus capacitor size may also be reduced by injecting harmonics of the AC input waveform into the feedback signal which also serves to substantially maintain efficiency of the (preferably LLC) resonant second stage.

公开(公告)号：US20160294296A1

公开(公告)日：2016-10-06

申请号：US15085225

申请日：2016-03-30

申请人： Virginia Tech Intellectual Properties, Inc.

发明人： Fred C. Lee ,  Xiucheng Huang ,  Qiang Li

IPC分类号： H02M3/335 ,  H02M1/42

CPC分类号： H02M1/4258 ,  H02M1/44 ,  H02M3/33592 ,  H02M2001/0058 ,  Y02B70/126 ,  Y02B70/1433 ,  Y02B70/1475 ,  Y02B70/1491

摘要： A two-stage power converter architecture including an isolation transformer and rectification of the isolation transformer output by an LLC resonant circuit and methodology for operating the same feeds an output voltage back to a circuit for generating waveforms for controlling a totem pole circuit to provide output voltage regulation as well as rectification of AC input voltage. The circuit for controlling the totem pole circuit may also be responsive to the AC input power waveform to provide power factor correction (PFC), in which case, the feedback signal provides additional pulse width modulation of the PFC signals. Bus capacitor size may also be reduced by injecting harmonics of the AC input waveform into the feedback signal which also serves to substantially maintain efficiency of the (preferably LLC) resonant second stage.

摘要翻译： 包括隔离变压器和由LLC谐振电路输出的隔离变压器整流的两级功率转换器架构及其操作方法将输出电压反馈到电路，用于产生用于控制图腾柱电路以提供输出电压的波形 调节以及交流输入电压的整流。 用于控制图腾柱电路的电路还可以响应于AC输入功率波形以提供功率因数校正（PFC），在这种情况下，反馈信号提供PFC信号的附加脉冲宽度调制。 也可以通过将AC输入波形的谐波注入到反馈信号中来减小总线电容器尺寸，其也用于基本上保持（优选LLC）谐振第二级的效率。

公开(公告)号：US09812978B2

公开(公告)日：2017-11-07

申请号：US15085012

申请日：2016-03-30

申请人： Virginia Tech Intellectual Properties, Inc.

发明人： Xiucheng Huang ,  Fred C. Lee ,  Qiang Li

IPC分类号： H02M3/335 ,  H02M1/44 ,  H02M1/08 ,  H02M1/00

CPC分类号： H02M3/33592 ,  H02M1/08 ,  H02M1/44 ,  H02M2001/0048 ,  Y02B70/1475

摘要： A voltage waveform similar to a waveform of a magnetizing current of an isolation transformer and immune to high frequency oscillatory resonant behavior is developed across a capacitor of a series resistor and capacitor connection connected in parallel with a synchronous rectifier. A simple logic circuit produces a waveform for controlling the synchronous rectifier which is not subject to significant turn on delay or early turn off caused by oscillatory resonances among parasitic inductances and capacitances. Improved timing accuracy of a synchronous converter provides improved power converter accuracy, particularly for flyback converters which are commonly used in converters for supplying power to offline electrical devices but are subject to oscillatory resonant behaviors that cannot be adequately damped at switching frequencies sufficiently high to support miniaturization of adapters.

公开(公告)号：US09735238B2

公开(公告)日：2017-08-15

申请号：US14471404

申请日：2014-08-28

申请人： Virginia Tech Intellectual Properties, Inc.

发明人： Xiucheng Huang ,  Weijing Du ,  Qiang Li ,  Fred C. Lee

IPC分类号： G05F1/00 ,  H01L29/20 ,  H01L29/16 ,  H03K17/10 ,  H03K17/567 ,  H02M1/00 ,  H03K17/687

CPC分类号： H01L29/20 ,  H01L29/1608 ,  H01L29/2003 ,  H01L29/7828 ,  H02M2001/0058 ,  H03K17/102 ,  H03K17/567 ,  H03K2017/6875 ,  H03K2217/0036 ,  Y02B70/1491

摘要： In a cascode switching device, avalanche breakdown of a control transistor and loss of soft switching or zero voltage switching in a high voltage normally-on depletion mode transistor having a negative switching threshold voltage and the corresponding losses are avoided by providing additional capacitance in parallel with a parallel connection of drain-source parasitic capacitance of the control transistor and gate-source parasitic capacitance of the high voltage, normally-on transistor to form a capacitive voltage divider with the drain-source parasitic capacitance of the high voltage, normally-on transistor such that the avalanche breakdown voltage of the control transistor cannot be reached. The increased capacitance also assures that the drain source parasitic capacitance of the high voltage, normally-on transistor is fully discharged before internal turn-on can occur.

公开(公告)号：US20150200583A1

公开(公告)日：2015-07-16

申请号：US14471404

申请日：2014-08-28

申请人： Virginia Tech Intellectual Properties, Inc.

发明人： Xiucheng Huang ,  Weijing Du ,  Qiang Li ,  Fred C. Lee

IPC分类号： H02M1/08 ,  H01L27/06 ,  H01L29/16 ,  H01L29/20 ,  H02M3/156 ,  H03K3/012

CPC分类号： H01L29/20 ,  H01L29/1608 ,  H01L29/2003 ,  H01L29/7828 ,  H02M2001/0058 ,  H03K17/102 ,  H03K17/567 ,  H03K2017/6875 ,  H03K2217/0036 ,  Y02B70/1491

摘要： In a cascode switching device, avalanche breakdown of a control transistor and loss of soft switching or zero voltage switching in a high voltage normally-on depletion mode transistor having a negative switching threshold voltage and the corresponding losses are avoided by providing additional capacitance in parallel with a parallel connection of drain-source parasitic capacitance of the control transistor and gate-source parasitic capacitance of the high voltage, normally-on transistor to form a capacitive voltage divider with the drain-source parasitic capacitance of the high voltage, normally-on transistor such that the avalanche breakdown voltage of the control transistor cannot be reached. The increased capacitance also assures that the drain source parasitic capacitance of the high voltage, normally-on transistor is fully discharged before internal turn-on can occur.

摘要翻译： 在共源共极开关器件中，通过提供与...的并联的附加电容来避免控制晶体管的雪崩击穿以及具有负开关阈值电压和相应损耗的高电压常开耗尽型晶体管中的软开关或零电压开关损耗 控制晶体管的漏 - 源寄生电容和高压常栅晶体管的栅 - 源寄生电容的并联连接，形成具有高电压漏极 - 源极寄生电容的电容分压器，常闭晶体管 使得控制晶体管的雪崩击穿电压不能达到。 增加的电容还保证了高电压，常开晶体管的漏源寄生电容在内部导通之前被完全放电。