公开(公告)号：US09046905B2

公开(公告)日：2015-06-02

申请号：US13791234

申请日：2013-03-08

Applicant: ANALOG DEVICES GLOBAL

Inventor： Song Qin

IPC: G05F1/618 ,  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：US09791480B2

公开(公告)日：2017-10-17

申请号：US13899143

申请日：2013-05-21

Applicant: ANALOG DEVICES GLOBAL

Inventor： Song Qin

IPC: G01R19/00 ,  H02M3/158 ,  H02M1/00

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

Abstract: Apparatus and methods for current sensing in switching regulators include a current sensing circuit to sense 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.