公开(公告)号：US20170302174A1

公开(公告)日：2017-10-19

申请号：US15479162

申请日：2017-04-04

Applicant: Linear Technology Corporation

Inventor： Yingyi Yan ,  Yi Ding Gu

IPC: H02M3/157 ,  H02M1/12 ,  H02M1/14 ,  H02M1/084 ,  H02M1/00

CPC classification number: H02M3/157 ,  H02M1/084 ,  H02M1/12 ,  H02M1/14 ,  H02M3/1584 ,  H02M2001/0009

Abstract: In a multiphase, current mode controlled switching power supply, current through the inductors in the various phases is sensed to determine when to turn off the switching transistors. An AC current feedback path, sensing the ramping ripple current, is separate from the DC current path, sensing the lower frequency average current. A shared differential amplifier has its inputs multiplexed to receive only the DC component signals from all the phases. The gain of the amplifier is set so that the DC sense signal has the proper proportion to the AC sense signal. The output of the amplifier is sampled and held for each phase using a second multiplexer. The AC sense signal and the amplified DC sense signal, for each phase, are combined by a summing circuit. The composite sense signal is applied to a comparator for each phase to control the duty cycle of the associated switch.

公开(公告)号：US09793800B1

公开(公告)日：2017-10-17

申请号：US15479162

申请日：2017-04-04

Applicant: Linear Technology Corporation

Inventor： Yingyi Yan ,  Yi Ding Gu

IPC: H02M3/157 ,  H02M1/084 ,  H02M1/14 ,  H02M1/12 ,  H02M1/00

CPC classification number: H02M3/157 ,  H02M1/084 ,  H02M1/12 ,  H02M1/14 ,  H02M3/1584 ,  H02M2001/0009

Abstract: In a multiphase, current mode controlled switching power supply, current through the inductors in the various phases is sensed to determine when to turn off the switching transistors. An AC current feedback path, sensing the ramping ripple current, is separate from the DC current path, sensing the lower frequency average current. A shared differential amplifier has its inputs multiplexed to receive only the DC component signals from all the phases. The gain of the amplifier is set so that the DC sense signal has the proper proportion to the AC sense signal. The output of the amplifier is sampled and held for each phase using a second multiplexer. The AC sense signal and the amplified DC sense signal, for each phase, are combined by a summing circuit. The composite sense signal is applied to a comparator for each phase to control the duty cycle of the associated switch.

公开(公告)号：US09525351B2

公开(公告)日：2016-12-20

申请号：US14755336

申请日：2015-06-30

Applicant: Linear Technology Corporation

Inventor： Jian Li ,  Yingyi Yan ,  Xu Zhang ,  Zhouyuan Shi

IPC: H02M3/158 ,  H02M3/156 ,  H02M1/00

CPC classification number: H02M3/1588 ,  G01R19/0092 ,  G01R31/40 ,  H02M3/156 ,  H02M2001/0009

Abstract: In a current mode switching power supply, current through the inductor needs to be sensed to control the peak current. The inductor current includes a DC component and an AC component containing switching noise. To reduce the switching noise, the actual inductor current is sensed to generate a signal, and a first AC component is attenuated by a first RC circuit while not attenuating a first DC component. A second AC component is derived by applying the rectangular wave switch voltage, which is at the duty cycle of the regulator, to a second RC filter, which blocks a second DC component. The second AC component is much larger than the first AC component and does not contain switching noise. The large second AC component, the smaller “noisy” first AC component, and the first DC component are applied to the first RC circuit to create a low-noise inductor current signal.

Abstract translation: 在电流模式切换电源中，需要检测通过电感的电流来控制峰值电流。 电感电流包括DC分量和包含开关噪声的AC分量。 为了减小开关噪声，感测实际的电感电流以产生信号，并且第一AC分量由第一RC电路衰减而不衰减第一DC分量。 通过将处于调节器的占空比的矩形波开关电压施加到阻塞第二DC分量的第二RC滤波器来导出第二AC分量。 第二个交流分量比第一个交流分量大得多，不包含开关噪声。 大的第二AC分量，较小的“噪声”第一AC分量和第一DC分量被施加到第一RC电路以产生低噪声电感器电流信号。

公开(公告)号：US20160164412A1

公开(公告)日：2016-06-09

申请号：US14755336

申请日：2015-06-30

Applicant: Linear Technology Corporation

Inventor： Jian Li ,  Yingyi Yan ,  Xu Zhang ,  Zhouyuan Shi

IPC: H02M3/158

CPC classification number: H02M3/1588 ,  G01R19/0092 ,  G01R31/40 ,  H02M3/156 ,  H02M2001/0009

Abstract: In a current mode switching power supply, current through the inductor needs to be sensed to control the peak current. The inductor current includes a DC component and an AC component containing switching noise. To reduce the switching noise, the actual inductor current is sensed to generate a signal, and a first AC component is attenuated by a first RC circuit while not attenuating a first DC component. A second AC component is derived by applying the rectangular wave switch voltage, which is at the duty cycle of the regulator, to a second RC filter, which blocks a second DC component. The second AC component is much larger than the first AC component and does not contain switching noise. The large second AC component, the smaller “noisy” first AC component, and the first DC component are applied to the first RC circuit to create a low-noise inductor current signal.

Abstract translation: 在电流模式切换电源中，需要检测通过电感的电流来控制峰值电流。 电感电流包括DC分量和包含开关噪声的AC分量。 为了减小开关噪声，感测实际的电感电流以产生信号，并且第一AC分量由第一RC电路衰减而不衰减第一DC分量。 通过将处于调节器的占空比的矩形波开关电压施加到阻塞第二DC分量的第二RC滤波器来导出第二AC分量。 第二个交流分量比第一个交流分量大得多，不包含开关噪声。 大的第二AC分量，较小的“噪声”第一AC分量和第一DC分量被施加到第一RC电路以产生低噪声电感器电流信号。