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1.发明授权公开(公告)号：US09812978B2
公开(公告)日：2017-11-07
申请号：US15085012
申请日：2016-03-30
发明人： Xiucheng Huang , Fred C. Lee , Qiang Li
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.
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公开(公告)号：US09735238B2
公开(公告)日：2017-08-15
申请号：US14471404
申请日：2014-08-28
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.
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公开(公告)号：US20170222483A1
公开(公告)日：2017-08-03
申请号：US15417353
申请日：2017-01-27
发明人： Junjie Feng , Qiang Li , Fred C. Lee , Minfan Fu
CPC分类号： H02J50/12 , H02J7/0042 , H02J7/025 , H02J50/90
摘要： In one example, an omnidirectional wireless power transfer system includes high frequency power generator configured to generate a supply of high frequency oscillating power, a number of transmitter-side resonant tank circuits electrically coupled to the high frequency power generator, a receptacle including a number of coils arranged for omnidirectional power transfer to an electronic device placed in the receptacle, and a controller configured to activate individual ones of the transmitter-side resonant tank circuits to wirelessly transmit power to the electronic device through near-field resonant inductive coupling. In one example, the receptacle can be embodied as a bowl, and the controller can activate individual ones of the transmitter-side resonant tank circuits over time to generate an omnidirectional field distribution for wireless power transmission. In other aspects, various transmitter-side and receiver-side tank circuits for coupling independent resonance and ZVS operation are described.
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公开(公告)号：US09678521B2
公开(公告)日：2017-06-13
申请号：US14050435
申请日：2013-10-10
发明人： Pei-Hsin Liu , Fred C. Lee , Yingyi Yan , Paolo Mattavelli
CPC分类号： G05F1/468 , H02M3/156 , H02M3/157 , H02M2001/0012 , H02M2001/0025
摘要： Peak current, valley current or average current mode controlled power converters in either digital or analog implementations obtain a stabilized feedback loop and allow high system bandwidth design by use of an external ramp generator using a slope computation equation or design parameters based on fixing the quality factor of a double pole at one-half of the switching frequency at a desired value The slope of the external ramp waveform is tuned automatically with knowledge of the slope change in the waveform of inductor current of a power converter derived by differentiating a waveform in the current feedback loop. This autotuning of the external ramp generator provides immunity of quality factor change under variations of duty cycle, component values of topological change of the power converter.
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5.发明申请Current Mode Control DC-DC Converter with Single Step Load Transient Response 审中-公开具有单步负载瞬态响应的电流模式控制DC-DC转换器公开(公告)号：US20160294278A1
公开(公告)日：2016-10-06
申请号：US15075553
申请日：2016-03-21
发明人： Virginia Li , Pei-Hsin Liu , Qiang Li , Fred C. Lee
IPC分类号： H02M3/04
CPC分类号： H02M3/156 , H02M2003/1566
摘要： A power converter using constant on-time (COT) or ramp pulse modulation (RPM) control achieves more rapid resumption of steady-state operation after a step-up load transient by extending an on-time of a switching pulse by interrupting a ramp voltage waveform that is compared with a threshold that equals a threshold voltage at the termination of a switching pulse or increasing a voltage with which the ramp voltage is compared. These techniques are applied to both single-phase and multi-phase power converters.
摘要翻译： 使用恒定导通时间（COT）或斜坡脉冲调制（RPM）控制的功率转换器通过通过中断斜坡电压来延长开关脉冲的导通时间来实现升压负载瞬变之后的更快恢复稳态操作 该波形与等于开关脉冲终止时的阈值电压的阈值进行比较，或增加与斜坡电压进行比较的电压。 这些技术适用于单相和多相功率转换器。
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6.发明授权公开(公告)号：US09318946B2
公开(公告)日：2016-04-19
申请号：US14087076
申请日：2013-11-22
发明人： Weiyi Feng , Fred C. Lee
CPC分类号： H02M1/36 , H02M3/3376 , H02M2001/0058 , Y02B70/1433 , Y02B70/1491
摘要： By setting switching instants of a switching circuit of a resonant power converter based on current in a resonant circuit reaching a current limit of a current limitation band, soft start-up of the power converter can be achieved to avoid or limit electrical stress with full control over a trade-off between time required to settle to a full load steady-state mode of operation and the amount of electrical stress permitted while soft start up switching frequency is automatically optimized.
摘要翻译： 通过基于达到电流限制带的电流限制的谐振电路中的电流来设置谐振功率转换器的开关电路的开关时刻，可以实现功率转换器的软启动，以完全控制以避免或限制电应力 在软启动切换频率自动优化的同时，在满足全负载稳态运行模式所需的时间和允许的电压应力之间进行权衡。
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7.发明授权Optimal trajectory control for LLC resonant converter for LED PWM dimming 有权用于LED PWM调光的LLC谐振变换器的最佳轨迹控制公开(公告)号：US09276480B2
公开(公告)日：2016-03-01
申请号：US14140008
申请日：2013-12-24
发明人： Weiyi Feng , Fred C. Lee , Shu Ji
CPC分类号： H02M3/33507 , H02M3/33561 , H02M3/337 , H02M2001/0058 , H05B33/0815 , H05B33/0827 , Y02B70/1433 , Y02B70/1491
摘要： Pulse width modulation is provided for controlling a resonant power converter, particularly for dimming of light emitting diode arrays without loss of efficiency. Dynamic oscillation due to the beginning of a pulse width modulated pulse burst is limited by shortening of the first and/or last pulse of a pulse bust such that the first pulse of a subsequent pulse burst close to or to connect with a full load steady-state voltage/current trajectory of the power converter. Pulse shortening made be made substantially exact to virtually eliminate dynamic oscillation but substantial reduction in dynamic oscillation is provided if inexact or even performed randomly.
摘要翻译： 提供脉宽调制用于控制谐振功率转换器，特别是用于调光发光二极管阵列而不损失效率。 由于脉冲宽度调制脉冲串的开始而产生的动态振荡受到脉冲胸部的第一和/或最后脉冲的缩短的限制，使得后续脉冲的第一脉冲突然接近或与全负载稳态连接， 电源转换器的状态电压/电流轨迹。 基本上精确地实现脉冲缩短以实质上消除动态振荡，但是如果不精确或甚至随机地执行，则提供动态振荡的显着降低。
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8.发明申请公开(公告)号：US20150200583A1
公开(公告)日：2015-07-16
申请号：US14471404
申请日：2014-08-28
发明人： Xiucheng Huang , Weijing Du , Qiang Li , Fred C. Lee
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。
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公开(公告)号：US20140306540A1
公开(公告)日：2014-10-16
申请号：US14065986
申请日：2013-10-29
发明人： Xinke Wu , Zijian Wang , Fred C. Lee , Feng Wang
IPC分类号： H02J1/06
CPC分类号： H02J3/385 , Y02E10/58 , Y10T307/685
摘要： Approximately one-half of the loss of delivered power from a solar panel having photovoltaic (PV) cells connected in series to form sub-panels due to shading is recovered at low hardware cost by connecting sub-panels in series and providing maximum power point tracking control in common for the series connected sub-panels such that the respective sub-panels produce equal voltages even in the presence of shading of a portion of one or more sub-panels. By doing so, the input voltage of respective power converters which control the voltage at which each sub-panel is operated can be placed close to the maximum power point of each sub-panel regardless of shading and maximum total power harvested even though the respective sub-panels are not operated at optimum voltages.
摘要翻译： 通过将子板串联连接并提供最大功率点跟踪，以低硬件成本从具有串联连接以形成子面板的光伏（PV）单元的太阳能电池板的输电功率的大约一半被恢复 对于串联连接的子面板共同控制，使得即使在存在一个或多个子面板的一部分的阴影的情况下，相应的子面板也产生相等的电压。 通过这样做，控制每个子面板操作的电压的各个功率转换器的输入电压可以放置在每个子面板的最大功率点附近，而不管阴影和最大总功率如何，即使相应的子 电极不能以最佳电压工作。
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公开(公告)号：US10673328B2
公开(公告)日：2020-06-02
申请号：US15089744
申请日：2016-04-04
发明人： Syed Bari , Fred C. Lee , Qiang Li
摘要： An amount of charge transferred by a power converter is estimated by developing a signal that is a combination of signals representing an output voltage of a power converter and an inductor current of the power converter, charging a capacitor with a current proportional to that signal and comparing a voltage developed across the capacitor due to that charging to develop a signal for initiating a pulse to control input of power from a voltage source to the power converter. By using a signal developed in this way, response to both step-up and step-down transients can be improved and, in multi-phase embodiments, ripple cancellation problems such as noise susceptibility and loss of pulse generation can be entirely avoided.
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