US 12,456,857 B2
Power converter current sense fault detection
Arun Khamesra, Bangalore (IN); Hariom Rai, Bangalore (IN); and Pulkit Shah, Bangalore (IN)
Assigned to Cypress Semiconductor Corporation, San Jose, CA (US)
Filed by Cypress Semiconductor Corporation, San Jose, CA (US)
Filed on Jun. 12, 2023, as Appl. No. 18/333,373.
Claims priority of provisional application 63/447,129, filed on Feb. 21, 2023.
Prior Publication US 2024/0280645 A1, Aug. 22, 2024
Int. Cl. H02H 7/12 (2006.01); H02H 7/125 (2006.01); H02M 1/00 (2006.01); H02M 3/335 (2006.01)
CPC H02H 7/1255 (2013.01) [H02M 1/0006 (2021.05); H02M 3/33576 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A secondary-side controller for a Universal Serial Bus Power Delivery (USB-PD) power converter, the secondary-side controller comprising:
a driver configured to control a power-switch on a primary side of the USB-PD power converter based on a pulse width modulated (PWM) signal;
a current sense amplifier configured to generate an output current signal corresponding to an output current provided by the USB-PD power converter across an external sense resistor; and
a controller configured to:
dynamically generate a PWM threshold based on at least one of a secondary-side line input voltage or a secondary-side output voltage; and
identify a fault condition based on the PWM signal violating the PWM threshold and based on the output current signal.