US 12,455,603 B2
Universal serial bus power delivery (USB-PD)
Arun Khamesra, Bangalore (IN); Hariom Rai, Bangalore (IN); and Soon Hwei Tan, Singapore (SG)
Assigned to Cypress Semiconductor Corporation, San Jose, CA (US)
Filed by Cypress Semiconductor Corporation, San Jose, CA (US)
Filed on Sep. 26, 2023, as Appl. No. 18/475,001.
Prior Publication US 2025/0103119 A1, Mar. 27, 2025
Int. Cl. G06F 1/26 (2006.01); G06F 1/3215 (2019.01); G06F 1/3234 (2019.01); G06F 1/3287 (2019.01); H02M 1/00 (2007.01)
CPC G06F 1/266 (2013.01) [G06F 1/3215 (2013.01); G06F 1/3253 (2013.01); G06F 1/3287 (2013.01); H02M 1/0032 (2021.05); G06F 2213/0042 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A Universal Serial Bus Power Delivery (USB-PD) system comprising:
a transformer comprising a primary-side coupled to receive a rectified alternating current (AC) input voltage at an input port, and a secondary-side connected to provide a direct current (DC) output voltage at an output port;
a first power switch connected to the primary-side;
a second power switch connected between the input port and the primary-side;
a primary-side controller coupled to the first power switch to control operation of the transformer;
a gate driver connected between the second power switch and the primary-side controller, wherein the primary-side controller is configured to:
transition from a primary-side active mode to a primary-side low power mode responsive to receiving a low power mode signal;
power down the gate driver in the primary-side low power mode; and
transition from the primary-side low power mode to the primary-side active mode responsive to receiving an active mode signal; and
a secondary-side controller coupled to the output port, wherein the secondary-side controller configured to:
responsive to detecting an absence of a load device on the output port, send the low power mode signal to the primary-side controller and transition from a secondary-side active mode to a secondary-side low power mode; and
responsive to detecting a connection of the load device to the output port, transition from the secondary-side low power mode to the secondary-side active mode and send the active mode signal to the primary-side controller.