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：US10084381B2

公开(公告)日：2018-09-25

申请号：US15654568

申请日：2017-07-19

Applicant: Linear Technology Corporation

Inventor： Xu Zhang ,  Jian Li ,  Zhouyuan Shi ,  Yi Ding Gu

IPC: G06F1/00 ,  H02M3/158 ,  H02M1/00

CPC classification number: H02M3/1582 ,  H02M2001/0009

Abstract: An inductor current-sensing circuit for measuring a current in an inductor includes (a) a first RC network coupled between a first terminal of the inductor and a reference voltage source; and (b) a second RC network coupled between a second terminal of the inductor and the reference voltage source. The first RC network and the second RC network each have a time constant substantially equal to the ratio between the inductance and the DC resistance of the inductor. The inductor which current is being measured may be a primary inductor of a four-switch buck boost converter receiving an input voltage and providing an output voltage.

公开(公告)号：US20170324331A1

公开(公告)日：2017-11-09

申请号：US15654568

申请日：2017-07-19

Applicant: Linear Technology Corporation

Inventor： Xu Zhang ,  Jian Li ,  Zhouyuan Shi ,  Yi Ding Gu

IPC: H02M3/158 ,  H02M1/00

CPC classification number: H02M3/1582 ,  H02M2001/0009

Abstract: An inductor current-sensing circuit for measuring a current in an inductor includes (a) a first RC network coupled between a first terminal of the inductor and a reference voltage source; and (b) a second RC network coupled between a second terminal of the inductor and the reference voltage source. The first RC network and the second RC network each have a time constant substantially equal to the ratio between the inductance and the DC resistance of the inductor. The inductor which current is being measured may be a primary inductor of a four-switch buck boost converter receiving an input voltage and providing an output voltage.

公开(公告)号：US09748843B2

公开(公告)日：2017-08-29

申请号：US14677794

申请日：2015-04-02

Applicant: Linear Technology Corporation

Inventor： Xu Zhang ,  Jian Li ,  Zhouyuan Shi ,  Yi Ding Gu

IPC: G05F1/24 ,  H02M3/158 ,  H02M1/00

CPC classification number: H02M3/1582 ,  H02M2001/0009

Abstract: An inductor current-sensing circuit for measuring a current in an inductor includes (a) a first RC network coupled between a first terminal of the inductor and a reference voltage source; and (b) a second RC network coupled between a second terminal of the inductor and the reference voltage source. The first RC network and the second RC network each have a time constant substantially equal to the ratio between the inductance and the DC resistance of the inductor. The inductor which current is being measured may be a primary inductor of a four-switch buck boost converter receiving an input voltage and providing an output voltage.

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。

公开(公告)号：US20160087531A1

公开(公告)日：2016-03-24

申请号：US14677794

申请日：2015-04-02

Applicant: Linear Technology Corporation

Inventor： Xu Zhang ,  Jian Li ,  Zhouyuan Shi ,  Yi Ding Gu

IPC: H02M3/158

CPC classification number: H02M3/1582 ,  H02M2001/0009

Abstract: An inductor current-sensing circuit for measuring a current in an inductor includes (a) a first RC network coupled between a first terminal of the inductor and a reference voltage source; and (b) a second RC network coupled between a second terminal of the inductor and the reference voltage source. The first RC network and the second RC network each have a time constant substantially equal to the ratio between the inductance and the DC resistance of the inductor. The inductor which current is being measured may be a primary inductor of a four-switch buck boost converter receiving an input voltage and providing an output voltage.

Abstract translation: 用于测量电感器中的电流的电感器电流感测电路包括（a）耦合在电感器的第一端子和参考电压源之间的第一RC网络; 和（b）耦合在电感器的第二端子和参考电压源之间的第二RC网络。 第一RC网络和第二RC网络各自具有基本上等于电感器和电感器的直流电阻之间的比率的时间常数。 正在测量电流的电感器可以是接收输入电压并提供输出电压的四开关降压升压转换器的初级电感器。