公开(公告)号：US20180160516A1

公开(公告)日：2018-06-07

申请号：US15601549

申请日：2017-05-22

Applicant: QUALCOMM Incorporated

Inventor： Taewoo KWAK ,  Sivaprasad EMBANATH

IPC: H05B41/282 ,  H05B33/08 ,  H05B37/02

CPC classification number: H05B41/282 ,  H05B33/0815 ,  H05B33/0827 ,  H05B33/083 ,  H05B33/0845 ,  H05B37/0209

Abstract: Liquid crystal display (LCD) backlight boost converters are adaptively controlled, digitally, to achieve improved ripple voltage regardless of independent dimming among light emitting diode (LED) strings. Adaptively controlling an LCD backlight boost converter includes determining, during normal operation, an ongoing current or expected current (e.g., load current) provided to or expected to be provided to one or more of the LED strings by the display backlight boost converters. The controlling of the LCD backlight boost converter further includes adjusting a bandwidth of a boost control loop for controlling the LED backlight boost converter based on the ongoing current or expected current to the LED string(s).

公开(公告)号：US20200073425A1

公开(公告)日：2020-03-05

申请号：US16554082

申请日：2019-08-28

Applicant: QUALCOMM Incorporated

Inventor： Yikai WANG ,  Sivaprasad EMBANATH ,  Joseph Dale RUTKOWSKI

IPC: G05F1/575 ,  G05F1/565

Abstract: Certain aspects of the present disclosure generally relate to methods and apparatus for switching between modes of a multi-mode power supply circuit. One example power supply circuit generally includes a switched-mode power supply (SMPS) circuit, a voltage regulator circuit having an input coupled to an output of the SMPS circuit, the voltage regulator circuit being configured to be selectively enabled, a first voltage divider selectively coupled to the output of the SMPS circuit and selectively coupled to an output of the voltage regulator circuit, and a second voltage divider coupled to the output of the voltage regulator circuit.