公开(公告)号：US20140253062A1

公开(公告)日：2014-09-11

申请号：US13791234

申请日：2013-03-08

Applicant: ANALOG DEVICES TECHNOLOGY

Inventor： Song Qin

IPC: G05F1/10

CPC classification number: G05F1/10 ,  H02M1/088 ,  H02M3/1588 ,  H02M2001/0009 ,  Y02B70/1466

Abstract: Apparatus and methods for current sensing in switching regulators are provided. In certain implementations, a switching regulator includes a switch transistor, a replica transistor, a current source, a sense resistor, and a current sensing circuit. The drain and gate of the switch transistor can be electrically connected to the drain and gate of the replica transistor, respectively. Additionally, the current sensing circuit can control the voltage of the source of the replica transistor based on the polarity of a current through the switch transistor to generate an output current that changes in response to the switch transistor's current. The sense resistor can receive an offset current from the first current source and the output current from the current sensing circuit such that the voltage across the sense resistor changes in relation to the current through the switch transistor.

Abstract translation: 提供了开关稳压器中电流检测的装置和方法。 在某些实现中，开关调节器包括开关晶体管，复制晶体管，电流源，检测电阻和电流感测电路。 开关晶体管的漏极和栅极可以分别电连接到复制晶体管的漏极和栅极。 此外，电流感测电路可以基于通过开关晶体管的电流的极性来控制复制晶体管的源的电压，以产生响应于开关晶体管的电流而改变的输出电流。 感测电阻器可以接收来自第一电流源的偏移电流和来自电流感测电路的输出电流，使得感测电阻两端的电压相对于通过开关晶体管的电流而变化。

公开(公告)号：US08937467B2

公开(公告)日：2015-01-20

申请号：US13791210

申请日：2013-03-08

Applicant: Analog Devices Technology

Inventor： Song Qin

IPC: G05F1/40 ,  G05F3/02

CPC classification number: H02M3/158 ,  H02M2001/0009

Abstract: Apparatus and methods for current sensing in switching regulators are provided. In certain implementations, a switching regulator includes a switch transistor, a replica transistor, a sense resistor, and a current sensing circuit. The drain and gate of the switch transistor can be electrically connected to the drain and gate of the replica transistor, respectively. The current sensing circuit can generate an output current that varies in response to a sense current from a source of the replica transistor. Additionally, the current sensing circuit can sink the sense current when the sense current flows from the drain to the source of the replica transistor and source the sense current when the sense current flows from the source to the drain of the replica transistor. The sense resistor can receive the output current such that the voltage across the sense resistor changes in relation to the current through the switch transistor.

Abstract translation: 提供了开关稳压器中电流检测的装置和方法。 在某些实施方案中，开关调节器包括开关晶体管，复制晶体管，检测电阻器和电流感测电路。 开关晶体管的漏极和栅极可以分别电连接到复制晶体管的漏极和栅极。 电流感测电路可以产生响应于来自复制晶体管的源的感测电流而变化的输出电流。 此外，当感测电流从复制晶体管的漏极流到源极时，电流感测电路可以吸收感测电流，并且当感测电流从复制晶体管的源极流到漏极时，该电流感测电路能够输出感测电流。 检测电阻器可以接收输出电流，使得检测电阻两端的电压相对于通过开关晶体管的电流而变化。

公开(公告)号：US20140253089A1

公开(公告)日：2014-09-11

申请号：US13791210

申请日：2013-03-08

Applicant: ANALOG DEVICES TECHNOLOGY

Inventor： Song Qin

IPC: G05F3/02

CPC classification number: H02M3/158 ,  H02M2001/0009

Abstract: Apparatus and methods for current sensing in switching regulators are provided. In certain implementations, a switching regulator includes a switch transistor, a replica transistor, a sense resistor, and a current sensing circuit. The drain and gate of the switch transistor can be electrically connected to the drain and gate of the replica transistor, respectively. The current sensing circuit can generate an output current that varies in response to a sense current from a source of the replica transistor. Additionally, the current sensing circuit can sink the sense current when the sense current flows from the drain to the source of the replica transistor and source the sense current when the sense current flows from the source to the drain of the replica transistor. The sense resistor can receive the output current such that the voltage across the sense resistor changes in relation to the current through the switch transistor.

Abstract translation: 提供了开关稳压器中电流检测的装置和方法。 在某些实施方案中，开关调节器包括开关晶体管，复制晶体管，检测电阻器和电流感测电路。 开关晶体管的漏极和栅极可以分别电连接到复制晶体管的漏极和栅极。 电流感测电路可以产生响应于来自复制晶体管的源的感测电流而变化的输出电流。 此外，当感测电流从复制晶体管的漏极流到源极时，电流感测电路可以吸收感测电流，并且当感测电流从复制晶体管的源极流到漏极时，该电流感测电路能够输出感测电流。 检测电阻器可以接收输出电流，使得检测电阻两端的电压相对于通过开关晶体管的电流而变化。

公开(公告)号：US09048734B2

公开(公告)日：2015-06-02

申请号：US13782223

申请日：2013-03-01

Applicant: Analog Devices Technology

Inventor： Song Qin

IPC: G05F1/00 ,  H02M1/32 ,  H02M3/158

CPC classification number: H02M1/32 ,  H02M3/1588 ,  Y02B70/1466

Abstract: A negative current protection system for a low side switching converter FET, for use with a switching converter arranged to operate high and low side FETs connected to an output inductor to produce an output voltage. The negative current protection system includes a current sensing circuit which produces an output Vcs that varies with the current in the high side FET, a negative current threshold generator which produces a threshold signal −Ith which represents the maximum negative current to which the low side FET is to be subjected, and a comparison circuit arranged to compare the valley portion of Vcs and -Ith and to set a flag if Vcs

Abstract translation: 一种用于低侧开关转换器FET的负电流保护系统，用于与连接到输出电感器的高低侧FET连接以产生输出电压的开关转换器。 负电流保护系统包括电流检测电路，其产生随着高侧FET中的电流而变化的输出Vcs;产生阈值信号的负电流阈值发生器，其表示低侧FET的最大负电流 并且比较电路被布置为比较Vcs和-Ith的谷部分，并且在开关周期中的预定时间（通常在转换器的消隐时间之后）设置Vcs <-Ith的标志。 当标志置位时，系统优选地通过调节开关FET的操作来减小负电流来进行响应。

公开(公告)号：US20140347078A1

公开(公告)日：2014-11-27

申请号：US13899143

申请日：2013-05-21

Applicant: ANALOG DEVICES TECHNOLOGY

Inventor： Song Qin

IPC: G01R19/00

CPC classification number: G01R19/0092 ,  H02M3/158 ,  H02M2001/0009

Abstract: Apparatus and methods for current sensing in switching regulators are disclosed. In certain implementations, a current sensing circuit senses current of a power stage of a power converter. The power converter can include first and second transistors. The current sensing circuit comprises a transistor that is a scaled version of one of the transistors of the power converter. A circuit of the current sensing circuit matches a drain-to-source voltage of the transistor of the current sensing circuit to the corresponding transistor of the power converter. A current mirror generates a current that mirrors the current flowing through the transistor of the current sensing circuit. A first resistor converts the mirrored current to a current sensed signal.

Abstract translation: 公开了用于开关调节器中的电流感测的装置和方法。 在某些实施方式中，电流感测电路感测功率转换器的功率级的电流。 功率转换器可以包括第一和第二晶体管。 电流感测电路包括晶体管，其是功率转换器的晶体管之一的缩放版本。 电流感测电路的电路将电流感测电路的晶体管的漏极 - 源极电压与功率转换器的相应晶体管相匹配。 电流镜产生反映流过电流感测电路的晶体管的电流的电流。 第一个电阻将镜像电流转换为电流检测信号。