公开(公告)号：US08803489B2

公开(公告)日：2014-08-12

申请号：US13184788

申请日：2011-07-18

申请人： Qian Li ,  Fred C. Lee ,  Ming Xu ,  Chuanyun Wang

发明人： Qian Li ,  Fred C. Lee ,  Ming Xu ,  Chuanyun Wang

IPC分类号： G05F1/70

CPC分类号： H02M1/4216 ,  H02M1/4225 ,  H02M1/44 ,  H02M2001/0032 ,  H02M2003/1586 ,  Y02B70/126 ,  Y02B70/16 ,  Y02P80/112

摘要： Light load efficiency of a power factor correction circuit is improved by adaptive on-time control and providing for selection between a continuous conduction mode and a discontinuous conduction mode wherein the discontinuous conduction mode increases time between switching pulses controlling connection of a cyclically varying voltage to a filter/inductor that delivers a desired DC voltage and thus can greatly reduce the switching frequency at light loads where switching frequency related losses dominate efficiency. The mode for controlling switching is preferably selected for each switching pulse within a half cycle of the cyclically varying input voltage. A multi-phase embodiment allows cancellation of EMI noise at harmonics of the switching frequency and adaptive change of phase angle allows for cancellation of dominant higher order harmonics as switching frequency is reduced.

摘要翻译： 通过自适应导通时间控制来提高功率因数校正电路的轻负载效率，并提供连续导通模式和不连续导通模式之间的选择，其中不连续导通模式增加了控制周期性变化的电压连接到开关脉冲之间的时间 滤波器/电感器提供所需的直流电压，因此可以大大降低开关频率相关损耗占优势的轻负载时的开关频率。 优选地，在循环变化的输入电压的半周期内针对每个开关脉冲选择用于控制切换的模式。 多相实施例允许在开关频率的谐波处消除EMI噪声，并且由于开关频率降低，相位角的自适应变化允许抵消主要高阶谐波。

公开(公告)号：US20120014148A1

公开(公告)日：2012-01-19

申请号：US13184788

申请日：2011-07-18

申请人： Qian Li ,  Fred C. Lee ,  Ming Xu ,  Chuanyun Wang

发明人： Qian Li ,  Fred C. Lee ,  Ming Xu ,  Chuanyun Wang

IPC分类号： H02M1/00

CPC分类号： H02M1/4216 ,  H02M1/4225 ,  H02M1/44 ,  H02M2001/0032 ,  H02M2003/1586 ,  Y02B70/126 ,  Y02B70/16 ,  Y02P80/112

摘要： Light load efficiency of a power factor correction circuit is improved by adaptive on-time control and providing for selection between a continuous conduction mode and a discontinuous conduction mode wherein the discontinuous conduction mode increases time between switching pulses controlling connection of a cyclically varying voltage to a filter/inductor that delivers a desired DC voltage and thus can greatly reduce the switching frequency at light loads where switching frequency related losses dominate efficiency. The mode for controlling switching is preferably selected for each switching pulse within a half cycle of the cyclically varying input voltage. A multi-phase embodiment allows cancellation of EMI noise at harmonics of the switching frequency and adaptive change of phase angle allows for cancellation of dominant higher order harmonics as switching frequency is reduced.

摘要翻译： 通过自适应导通时间控制来提高功率因数校正电路的轻负载效率，并提供连续导通模式和不连续导通模式之间的选择，其中不连续导通模式增加了控制周期性变化的电压连接到开关脉冲之间的时间 滤波器/电感器提供所需的直流电压，因此可以大大降低开关频率相关损耗占优势的轻负载时的开关频率。 优选地，在循环变化的输入电压的半周期内针对每个开关脉冲选择用于控制切换的模式。 多相实施例允许在开关频率的谐波处消除EMI噪声，并且由于开关频率降低，相位角的自适应变化允许抵消主要高阶谐波。

公开(公告)号：US07746675B2

公开(公告)日：2010-06-29

申请号：US11834281

申请日：2007-08-06

申请人： Chuanyun Wang ,  Ming Xu ,  Fred C. Lee

发明人： Chuanyun Wang ,  Ming Xu ,  Fred C. Lee

IPC分类号： H02M1/14

CPC分类号： H02M1/12 ,  H02M1/42 ,  H02M3/1584 ,  H02M2003/1586 ,  Y02B70/12

摘要： In a power converter having m=two or more channels of power factor correction (PFC) circuits connected in parallel and an electromagnetic interference (EMI) filter connected in series therewith, phase shifts in switching between the respective PFC channels can allow increase of EMI filter corner frequency allowing reduction of size and cost of the EMI filter at some switching frequencies. Asymmetrical phase shifts (other than 360°/m) such as 360°/2m and other phase shifts and variations in m allow increase of EMI filter corner frequency at switching frequencies where symmetrical, 360°/m phase shifts provide no benefit to EMI filter design by providing cancellation or partial cancellation of different harmonics of the switching noise; which cancellation may be arranged to be complementary to the EMI filter function at more than one peak of the noise spectrum. (Such asymmetrical phase shifts do not significantly increase ripple and consequent switching noise). Alteration of m and corresponding alteration of phase shift may be performed adaptively for purposes of improving efficiency at light loads and the like.

摘要翻译： 在具有并联连接的m = 2个或更多个功率因数校正（PFC）电路的通道和与其串联连接的电磁干扰（EMI））滤波器的功率转换器中，在相应PFC通道之间的切换中的相移可允许增加EMI滤波器 转角频率允许在某些开关频率下降低EMI滤波器的尺寸和成本。 360°/ 2m以外的不对称相移（360°/ 2m）和其它相移以及m的变化允许在对称的开关频率下增加EMI滤波器转角频率，360°/ m相移对EMI滤波器无益 通过提供消除或部分消除开关噪声的不同谐波的设计; 该消除可以被布置为在噪声谱的多于一个峰值处与EMI滤波器功能互补。 （这种非对称相移不会显着增加纹波和随之而来的开关噪声）。 m的改变和相移的相应改变可以自适应地进行，以提高轻负载等的效率。

公开(公告)号：US20080239771A1

公开(公告)日：2008-10-02

申请号：US11834281

申请日：2007-08-06

申请人： Chuanyun Wang ,  Ming Xu ,  Fred C. Lee

发明人： Chuanyun Wang ,  Ming Xu ,  Fred C. Lee

IPC分类号： H02M1/12

CPC分类号： H02M1/12 ,  H02M1/42 ,  H02M3/1584 ,  H02M2003/1586 ,  Y02B70/12

摘要： In a power converter having m=two or more channels of power factor correction (PFC) circuits connected in parallel and an electromagnetic interference (EMI) filter connected in series therewith, phase shifts in switching between the respective PFC channels can allow increase of EMI filter corner frequency allowing reduction of size and cost of the EMI filter at some switching frequencies. Asymmetrical phase shifts (other than 360°/m) such as 360°/2m and other phase shifts and variations in m allow increase of EMI filter corner frequency at switching frequencies where symmetrical, 360°/m phase shifts provide no benefit to EMI filter design by providing cancellation or partial cancellation of different harmonics of the switching noise; which cancellation may be arranged to be complementary to the EMI filter function at more than one peak of the noise spectrum. (Such asymmetrical phase shifts do not significantly increase ripple and consequent switching noise). Alteration of m and corresponding alteration of phase shift may be performed adaptively for purposes of improving efficiency at light loads and the like.

摘要翻译： 在具有并联连接的m = 2个或更多个功率因数校正（PFC）电路的通道和与其串联连接的电磁干扰（EMI））滤波器的功率转换器中，在相应PFC通道之间的切换中的相移可允许增加EMI滤波器 转角频率允许在某些开关频率下降低EMI滤波器的尺寸和成本。 360°/ 2m以外的不对称相移（360°/ 2m）和其它相移以及m的变化允许在对称的开关频率下增加EMI滤波器转角频率，360°/ m相移对EMI滤波器无益 通过提供消除或部分消除开关噪声的不同谐波的设计; 该消除可以被布置为在噪声谱的多于一个峰值处与EMI滤波器功能互补。 （这种非对称相移不会显着增加纹波和随之而来的开关噪声）。 m的改变和相移的相应改变可以自适应地进行，以提高轻负载等的效率。

公开(公告)号：US20120242299A1

公开(公告)日：2012-09-27

申请号：US13349571

申请日：2012-01-13

申请人： Ming Xu ,  Chuanyun Wang ,  Peng Mao

发明人： Ming Xu ,  Chuanyun Wang ,  Peng Mao

IPC分类号： G05F1/70

CPC分类号： H02M1/4216 ,  H02M1/4225 ,  Y02B70/126

摘要： A three-phase boost-buck PFC converter including three independent single-phase boost-buck PFC circuits respectively is provided, which are capable of performing PFC on each phase of the three-phase power. The single-phase boost-buck PFC circuit is composed of two single-phase boost-buck converters independently working in a positive and a negative half cycle of an input voltage, and the two single-phase boost-buck converters are connected in parallel at an input side, and are connected in series at an output side, and each of the single-phase boost-buck converters is composed of a front-end boost circuit and a back-end buck circuit connected in cascade. Compared to the existing technique, regardless of a boost mode or a buck mode, the conduction loss is effectively reduced, and the whole system efficiency is effectively improved.

摘要翻译： 提供了分别包括三个独立的单相升压 - 降压PFC电路的三相升压降压PFC转换器，它们能够在三相电源的每个相上执行PFC。 单相升压降压PFC电路由独立工作在输入电压的正半周期和负半周期的两个单相升压降压转换器组成，两个单相升压降压转换器并联连接 输入侧，并且在输出侧串联连接，并且每个单相升压降压转换器由级联连接的前端升压电路和后端降压电路组成。 与现有技术相比，无论升压模式还是降压模式，导通损耗都有效降低，整个系统效率得到有效的提高。

公开(公告)号：US08760128B2

公开(公告)日：2014-06-24

申请号：US13349571

申请日：2012-01-13

申请人： Ming Xu ,  Chuanyun Wang ,  Peng Mao

发明人： Ming Xu ,  Chuanyun Wang ,  Peng Mao

IPC分类号： G05F1/00

CPC分类号： H02M1/4216 ,  H02M1/4225 ,  Y02B70/126

摘要： A three-phase boost-buck PFC converter including three independent single-phase boost-buck PFC circuits respectively is provided, which are capable of performing PFC on each phase of the three-phase power. The single-phase boost-buck PFC circuit is composed of two single-phase boost-buck converters independently working in a positive and a negative half cycle of an input voltage, and the two single-phase boost-buck converters are connected in parallel at an input side, and are connected in series at an output side, and each of the single-phase boost-buck converters is composed of a front-end boost circuit and a back-end buck circuit connected in cascade. Compared to the existing technique, regardless of a boost mode or a buck mode, the conduction loss is effectively reduced, and the whole system efficiency is effectively improved.

摘要翻译： 提供了分别包括三个独立的单相升压 - 降压PFC电路的三相升压降压PFC转换器，它们能够在三相电源的每个相上执行PFC。 单相升压降压PFC电路由独立工作在输入电压的正半周期和负半周期的两个单相升压降压转换器组成，两个单相升压降压转换器并联连接 输入侧，并且在输出侧串联连接，并且每个单相升压降压转换器由级联连接的前端升压电路和后端降压电路组成。 与现有技术相比，无论升压模式还是降压模式，导通损耗都有效降低，整个系统效率得到有效的提高。