US 12,493,069 B2
Detecting motherboard power switch defects and LCD cable shorts
Chin-Jui Liu, Taoyuan (TW); Isaac Q. Wang, Austin, TX (US); and Ling-Feng Jian, Taipei (TW)
Assigned to Dell Products L.P., Round Rock, TX (US)
Filed by DELL PRODUCTS L.P., Round Rock, TX (US)
Filed on Jan. 25, 2024, as Appl. No. 18/422,071.
Prior Publication US 2025/0244379 A1, Jul. 31, 2025
Int. Cl. G01R 31/26 (2020.01); G01R 31/52 (2020.01)
CPC G01R 31/2621 (2013.01) [G01R 31/52 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A power switch, comprising:
an over-current detection circuit configured to detect an over-current condition in the power switch, to provide an over-current flag in a first state when no over-current condition is detected, and to provide the over-current flag in a second state when the over-current condition is detected;
an under-voltage detection circuit configured to detect an under-voltage condition in the power switch, and to provide an under-voltage fault indication in a third state when the under-voltage condition is not detected, and to provide the under-voltage fault indication in a fourth state when the under-voltage condition is detected; and
an over-current indication circuit configured to provide an over-current fault indication in the third state when the over-current flag is in the first state, and to provide the over-current fault indication in a fifth state when the over-current flag is in the second state;
wherein the under-voltage fault indication and the over-current fault indication are configured in a wired-or to provide a common fault indication.