Jae Young Choi

US Patent:

20200076430, Mar 5, 2020

Filed:

Feb 19, 2019

Appl. No.:

16/279422

Inventors:

- Dallas TX, US
SUNGHO BECK - PLANO TX, US
JAE WON CHOI - DALLAS TX, US
JOHNNY KLARENBEEK - DALLAS TX, US

International Classification:

H03K 17/693

Abstract:

A power source multiplexer includes a first switch circuit connected between a first input voltage source node and an output voltage node. A second switch circuit is connected between a second input voltage source node and the output voltage node. A driver circuit is configured to provide a steady-state current to drive one of the first or second switch circuits to electrically connect the respective input voltage source node to the output voltage node. A boost circuit is configured to boost the steady-state current for a switching time interval when switching from one of the input voltage source nodes being connected to the output node to the other of the input voltage source nodes being connected to the output voltage node.

US Patent:

20180048233, Feb 15, 2018

Filed:

Aug 9, 2016

Appl. No.:

15/232646

Inventors:

- DALLAS TX, US
SUJAN KUNDPUR MANOHAR - DALLAS TX, US
JAE WON CHOI - DALLAS TX, US

International Classification:

H02M 3/158
H02M 1/36

Abstract:

One example includes a power supply system. The system includes a power stage comprising at least one power switch that is periodically activated during an on-time of a duty-cycle based on a switching signal to generate an output voltage at an output. The system also includes a switching controller configured to generate the switching signal based on an amplitude of a capacitor voltage at a control node associated with a capacitor that defines the on-time of the duty-cycle as a function of the capacitor being periodically charged. The switching controller includes a pre-bias stage configured to apply a pre-bias charge to the capacitor via an offset voltage prior to a start of the on-time to pre-charge parasitic capacitance associated with the power supply system prior to the start of the on-time.