US 12,445,048 B2
Soft start rectifier for a power supply unit
Edward Douglas Knapton, Pflugerville, TX (US)
Assigned to Dell Products L.P., Round Rock, TX (US)
Filed by Dell Products L.P., Round Rock, TX (US)
Filed on May 30, 2023, as Appl. No. 18/325,191.
Prior Publication US 2024/0405666 A1, Dec. 5, 2024
Int. Cl. H02M 1/36 (2007.01); H02M 1/00 (2007.01); H02M 7/219 (2006.01)
CPC H02M 1/36 (2013.01) [H02M 1/0058 (2021.05); H02M 7/219 (2013.01); H02M 7/2195 (2021.05)] 13 Claims
OG exemplary drawing
 
1. A power supply unit (PSU), including:
an active bridge rectifier, including:
a plurality of field effect transistors (FETs), including a first FET, a second FET, a third FET, and a fourth FET; and
a controller connected to each of the FETs;
a power source connected between first and second terminals of the active bridge rectifier; and
a capacitor connected between third and fourth terminals of the active bridge rectifier,
wherein the first terminal is positioned between the first FET and the fourth FET; the second terminal is positioned between the second FET and the third FET; the third terminal is positioned between the first FET and the second FET; and the fourth terminal is positioned between third FET and the fourth FET;
wherein in a charging state:
the controller performs, at a first time, zero-crossing detection of a voltage of a power signal from the power source at the first and the second terminals, and in response, provides a first control signal to each of the FETs to enable each of the FETs for a fraction of a phase of current of the power signal such that the capacitor is charged during the fraction of the phase by the power signal, and
wherein the fraction of the phase of current of the power signal is based on a magnitude of a capacitance of the capacitor.