公开(公告)号：US08269570B2

公开(公告)日：2012-09-18

申请号：US12849799

申请日：2010-08-03

申请人： Xuening Li ,  Hal Chen ,  Weidong Zhu ,  Wenkai Wu

发明人： Xuening Li ,  Hal Chen ,  Weidong Zhu ,  Wenkai Wu

IPC分类号： H03K7/08 ,  G05F1/62 ,  G05F1/00

CPC分类号： H03K5/1252

摘要： Systems and devices for ripple reduction in a DC/DC converter are presented. The disclosed systems and methods enable ripple reduction in discontinuous conduction mode (DCM) operation. In DCM, the inductor current peak to peak ripple may be reduced based on the load current. To achieve the reduction of the inductor peak to peak current ripple, a digital counter is used to count the time between consecutive PWM pulses. The digital output of the counter is used to control the pulse width modulation. As the digital output of the counter increases, the PWM on-time decreases. Since the PWM pulse is demanded by the load in DCM mode, the peak to peak inductor ripple is modulated by the counter, or, in turn, modulated by the load current.

摘要翻译： 介绍了DC / DC转换器中纹波降低的系统和器件。 所公开的系统和方法使得不连续导通模式（DCM）操作中的纹波降低。 在DCM中，电感电流峰峰值纹波可能会根据负载电流而减小。 为了实现电感峰值电流纹波的降低，使用数字计数器对连续PWM脉冲之间的时间进行计数。 计数器的数字输出用于控制脉宽调制。 随着计数器的数字输出增加，PWM导通时间减少。 由于PWM模式下的负载要求PWM脉冲，所以峰值电感纹波由计数器调制，或由负载电流调制。

公开(公告)号：US09124177B2

公开(公告)日：2015-09-01

申请号：US12854097

申请日：2010-08-10

申请人： Weidong Zhu ,  Xuening Li ,  Hal Chen ,  Wenkai Wu

发明人： Weidong Zhu ,  Xuening Li ,  Hal Chen ,  Wenkai Wu

IPC分类号： G05F1/00 ,  H02M3/158 ,  H02M1/00

CPC分类号： H02M3/1588 ,  H02M2001/0032 ,  Y02B70/1466 ,  Y02B70/16

摘要： Systems and devices for smooth light load operation in a DC/DC converter are presented. The disclosed systems and methods enable smooth discontinuous conduction mode (DCM)/continuous conduction mode (CCM) transition. The disclosed systems and methods of smooth light load operation in a DC/DC converter may also avoid the generation of sub-harmonics during light load operation. In an example embodiment, a rising ramp is used to control the ON time of the converter oscillator, while a falling ramp controls the OFF time. During DCM operation, the minimum value of the falling ramp is clamped. The clamping of the falling ramp ensures a substantially similar level of the error amplifier output in both CCM and DCM and avoids disturbances caused by a difference in the error amplifier outputs between the modes.

摘要翻译： 介绍了在DC / DC转换器中平滑轻载操作的系统和设备。 所公开的系统和方法实现了平滑的不连续导通模式（DCM）/连续导通模式（CCM）转换。 所公开的在DC / DC转换器中平滑轻载操作的系统和方法也可以避免在轻负载操作期间产生次谐波。 在示例实施例中，上升斜坡用于控制转换器振荡器的导通时间，而下降斜坡控制OFF时间。 在DCM操作期间，下降斜坡的最小值被钳位。 下降斜坡的钳位确保CCM和DCM中误差放大器输出的电平基本相似，并避免由模式之间误差放大器输出的差异引起的干扰。

公开(公告)号：US20120038331A1

公开(公告)日：2012-02-16

申请号：US12854097

申请日：2010-08-10

申请人： Wenkai Wu ,  Weidong Zhu ,  Hal Chen ,  Xuening Li

发明人： Wenkai Wu ,  Weidong Zhu ,  Hal Chen ,  Xuening Li

IPC分类号： G05F1/10

CPC分类号： H02M3/1588 ,  H02M2001/0032 ,  Y02B70/1466 ,  Y02B70/16

摘要： Systems and devices for smooth light load operation in a DC/DC converter are presented. The disclosed systems and methods enable smooth discontinuous conduction mode (DCM)/continuous conduction mode (CCM) transition. The disclosed systems and methods of smooth light load operation in a DC/DC converter may also avoid the generation of sub-harmonics during light load operation. In an example embodiment, a rising ramp is used to control the ON time of the converter oscillator, while a falling ramp controls the OFF time. During DCM operation, the minimum value of the falling ramp is clamped. The clamping of the falling ramp ensures a substantially similar level of the error amplifier output in both CCM and DCM and avoids disturbances caused by a difference in the error amplifier outputs between the modes.

摘要翻译： 介绍了在DC / DC转换器中平滑轻载操作的系统和设备。 所公开的系统和方法实现了平滑的不连续导通模式（DCM）/连续导通模式（CCM）转换。 所公开的在DC / DC转换器中平滑轻载操作的系统和方法也可以避免在轻负载操作期间产生次谐波。 在示例实施例中，上升斜坡用于控制转换器振荡器的导通时间，而下降斜坡控制OFF时间。 在DCM操作期间，下降斜坡的最小值被钳位。 下降斜坡的钳位确保CCM和DCM中误差放大器输出的电平基本相似，并避免由模式之间误差放大器输出的差异引起的干扰。

公开(公告)号：US20120032748A1

公开(公告)日：2012-02-09

申请号：US12849799

申请日：2010-08-03

申请人： Xuening Li ,  Hal Chen ,  Weidong Zhu ,  Wenkai Wu

发明人： Xuening Li ,  Hal Chen ,  Weidong Zhu ,  Wenkai Wu

IPC分类号： H03K7/08 ,  G05F1/10 ,  H03K5/12

CPC分类号： H03K5/1252

摘要： Systems and devices for ripple reduction in a DC/DC converter are presented. The disclosed systems and methods enable ripple reduction in discontinuous conduction mode (DCM) operation. In DCM, the inductor current peak to peak ripple may be reduced based on the load current. To achieve the reduction of the inductor peak to peak current ripple, a digital counter is used to count the time between consecutive PWM pulses. The digital output of the counter is used to control the pulse width modulation. As the digital output of the counter increases, the PWM on-time decreases. Since the PWM pulse is demanded by the load in DCM mode, the peak to peak inductor ripple is modulated by the counter, or, in turn, modulated by the load current.

摘要翻译： 介绍了DC / DC转换器中纹波降低的系统和器件。 所公开的系统和方法使得不连续导通模式（DCM）操作中的纹波降低。 在DCM中，电感电流峰峰值纹波可能会根据负载电流而减小。 为了实现电感峰值电流纹波的降低，使用数字计数器对连续PWM脉冲之间的时间进行计数。 计数器的数字输出用于控制脉宽调制。 随着计数器的数字输出增加，PWM导通时间减小。 由于PWM模式下的负载要求PWM脉冲，所以峰值电感纹波由计数器调制，或由负载电流调制。

公开(公告)号：US20230299673A1

公开(公告)日：2023-09-21

申请号：US17934749

申请日：2022-09-23

申请人： Wenkai Wu ,  Jialun Du ,  Weidong Zhu

发明人： Wenkai Wu ,  Jialun Du ,  Weidong Zhu

IPC分类号： H02M3/158 ,  H02M1/088

CPC分类号： H02M3/158 ,  H02M1/088

摘要： A buck converter with an asymmetric threshold voltage of its gate drive circuit design for improving power efficiency while keeping the gate drive design simple.

公开(公告)号：US20230188028A1

公开(公告)日：2023-06-15

申请号：US17983703

申请日：2022-11-09

申请人： Wenkai Wu ,  Weidong Zhu ,  Qian Chen

发明人： Wenkai Wu ,  Weidong Zhu ,  Qian Chen

IPC分类号： H02M1/04 ,  H02M1/00 ,  H02M3/335

CPC分类号： H02M1/045 ,  H02M1/0054 ,  H02M3/33569

摘要： A multiphase buck converter that includes smart two-phase power stages for reducing switching losses. Each of the smart power stages includes a first high side switch, a second high side switch, a first low side switch, a second low side switch, a switching capacitor, a first inductor, and a second inductor. The exemplary multiphase buck converter includes two such smart power stages and a multiphase controller for generating PWM signals for driving the two smart power stages synchronously.

公开(公告)号：US07982441B2

公开(公告)日：2011-07-19

申请号：US12030269

申请日：2008-02-13

申请人： Mark Crowther ,  Wenkai Wu ,  George Schuellein

发明人： Mark Crowther ,  Wenkai Wu ,  George Schuellein

IPC分类号： G05F1/40

CPC分类号： H02M3/1584

摘要： A multiphase converter comprising a plurality of converter circuits, each converter circuit having series connected high and low side switches connected across a voltage bus with a common node provided therebetween, each of the common nodes connected through a respective inductor to an output node of the converter coupled to a load, the high and low side switches each being controlled by a control circuit to provide a desired output voltage at the output node, the control circuit including a first circuit for disabling and enabling at least one phase in response to a condition of the load, the circuit causing the high side switch to be turned on prior to the lower side switch when a disabled phase is enabled.

摘要翻译： 一种多相转换器，包括多个转换器电路，每个转换器电路具有连接在电压总线上的串联连接的高侧和低侧开关，其间设置有公共节点，每个公共节点通过相应的电感器连接到转换器的输出节点 耦合到负载，高低侧开关各自由控制电路控制以在输出节点处提供期望的输出电压，所述控制电路包括用于响应于第一电路的条件而禁用并使能至少一个相位的第一电路 当禁用相位被使能时，负载，导致高侧开关在下侧开关之前导通的电路。

公开(公告)号：US07888918B2

公开(公告)日：2011-02-15

申请号：US11835903

申请日：2007-08-08

申请人： Wenkai Wu ,  George Schuellein

发明人： Wenkai Wu ,  George Schuellein

IPC分类号： G05F1/00

CPC分类号： H02M3/1584 ,  H02M3/157

摘要： A control circuit for use in controlling a phase of a multi-phase voltage converter in accordance with an embodiment of the present invention includes a driver operable to provide a first control signal to a high side switch of a half-bridge of the phase and a second control signal to a low side switch of the half bridge, such that a desired output voltage is provided by the phase, current sensing circuitry operable to detect the output current of the phase, a comparator operable to compare the output current to a threshold current value and a disabling device operable to provide an enable/disable signal to disable the driver when the output current is below the threshold current value.

摘要翻译： 根据本发明的实施例的用于控制多相电压转换器的相位的控制电路包括驱动器，其可操作以向所述相的半桥的高侧开关提供第一控制信号，以及 第二控制信号提供给半桥的低侧开关，使得期望的输出电压由相位电流检测电路提供，可操作以检测相位的输出电流;比较器，可操作以将输出电流与阈值电流进行比较 值和禁用装置，其可操作以在所述输出电流低于所述阈值电流值时提供使能/禁止信号以禁用所述驱动器。

公开(公告)号：US07449867B2

公开(公告)日：2008-11-11

申请号：US11459179

申请日：2006-07-21

申请人： Wenkai Wu ,  Nai-chi Lee ,  George Schuellein

发明人： Wenkai Wu ,  Nai-chi Lee ,  George Schuellein

IPC分类号： G05F1/59 ,  G05F1/62

CPC分类号： H02M3/1584 ,  H02M2003/1586

摘要： A multi-phase converter comprising 2N+1 inductors; and 2N+1 switching converters parallel connected and each including a switched node; wherein N is an even integer, a pair of said inductors are coupled and wound about a common core and each said coupled inductor is connected at one pole thereof to a respective switched node and at another pole thereof to an output node, and at least one of said inductors is uncoupled from the other inductors.

公开(公告)号：US20080054971A1

公开(公告)日：2008-03-06

申请号：US11774242

申请日：2007-07-06

申请人： Wenkai Wu ,  George Schuellein

发明人： Wenkai Wu ,  George Schuellein

IPC分类号： H03K7/00 ,  H03K7/08

CPC分类号： H03K7/08

摘要： A pulse width modulation control circuit for providing a pulse width modulation signal in accordance with an embodiment of the present application includes a comparator operable to compare a first input to a second input and to provide the pulse width modulation signal based on the comparison, wherein the first input is an error signal and the second input is a ramp signal, wherein a first portion of the ramp is a decreasing ramp signal having a first slew rate and a second portion of the ramp signal is an increasing ramp signal having a second slew rate.

摘要翻译： 根据本申请的实施例的用于提供脉宽调制信号的脉冲宽度调制控制电路包括比较器，用于将第一输入与第二输入进行比较，并且基于该比较来提供脉宽调制信号，其中， 第一输入是误差信号，第二输入是斜坡信号，其中斜坡的第一部分是具有第一压摆率的递减斜坡信号，斜坡信号的第二部分是具有第二压摆率的增加斜坡信号 。