	US 12,107,423 B2
	System and method for selecting a voltage on a barrel adapter interface
Wei-Cheng Yu, New Taipei (TW); Merle Jackson Wood, Round Rock, TX (US); Tsung-Cheng Liao, Taoyuan (TW); Chin-Jui Liu, Taoyuan (TW); Andrew Thomas Sultenfuss, Leander, TX (US); and Chi Che Wu, Taipei (TW)
Assigned to Dell Products L.P., Round Rock, TX (US)
Filed by Dell Products L.P., Round Rock, TX (US)
Filed on Apr. 28, 2022, as Appl. No. 17/661,113.
Prior Publication US 2023/0352941 A1, Nov. 2, 2023
Int. Cl. G06F 1/18 (2006.01); G06F 1/26 (2006.01); H02J 3/18 (2006.01)

CPC H02J 3/18 (2013.01) [G06F 1/188 (2013.01); G06F 1/26 (2013.01)]

10 Claims

1. A method for supplying power to an information handling system at a voltage selected from a plurality of voltages, the method comprising:

receiving power from an alternating current (AC) adapter at a first voltage;

supplying power to an information handling system at the first voltage;

determining the AC adapter is capable of supplying power at a second voltage, including:

communicating with the AC adapter to get the power supply identification (PSID) information is performed over a first 1-wire interface using a first protocol; and

communicating with the AC adapter to determine one or more voltages the AC adapter is capable of providing is performed over a second 1-wire interface using a second protocol; and

initiating a voltage drop as a signal to switch between the first 1-wire interface and the second 1-wire interface;

establishing a power supply contract with the AC adapter to supply the power at the second voltage;

configuring a dock to operate in a device mode based on the power supply contract; and

communicating with the AC adapter to supply the power at the second voltage.