公开(公告)号：US11152861B2

公开(公告)日：2021-10-19

申请号：US16880452

申请日：2020-05-21

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Wenliang Chen ,  Reza Sharifi ,  Byron Mitchell Reed ,  Jairo Daniel Olivares ,  Ryan Erik Lind

IPC: H02M3/158 ,  H02M1/00 ,  H02M3/156 ,  H02M7/483

Abstract: This disclosure relates to a multiphase converter design with multi-path phase management circuit and output logic. The phase management circuit and output logic can be employed to implement phase adding and shedding operations based on input and output current information and based on control signals for a power stage of the converter. In some examples, the design employs an estimate of an average output current based on a current at an input of the converter for phase control. In additional examples, the design employs cycle-by-cycle current limit and maximum duty-cycle signals to enable phase quickly during load transient. In further examples, the design employs low input and output-current sensed signals for efficient phase shedding and power saving. The design herein improves an overall accuracy of phase adding and shedding, load transient response performance, an operational efficiency and thermal performance of multiphase converter.

公开(公告)号：US09942956B1

公开(公告)日：2018-04-10

申请号：US15395611

申请日：2016-12-30

Applicant: Texas Instruments Incorporated

Inventor： Wenliang Chen ,  Eung Jung Kim

IPC: H05B33/08 ,  H02M3/158 ,  H05B37/02

CPC classification number: H05B33/0815

Abstract: Embodiments of the invention improve efficiency and address the stability issues that arise when a boost converter is used for both backlight WLEDs and camera flash applications, which require increased voltage or output voltage less than input voltage. In prior solutions, boost converters may suffer poor efficiency when operating in a fixed high output voltage mode or may lose stability by not properly regulating their output when operating in a step-down voltage mode. To improve efficiency of the boost converter, the present invention uses a 100%-pass mode topology when the battery voltage is high enough to support the diode voltage required for the backlight WLEDs or the camera flash. On the other hand, when the battery voltage drops below the required voltage, then the converter switches automatically to boost mode to generate a sufficient output voltage to drive the diodes to the required current level.