公开(公告)号：US20250038650A1

公开(公告)日：2025-01-30

申请号：US18360347

申请日：2023-07-27

Applicant: Apple Inc.

Inventor： Yantao Song ,  Abby Cherian ,  Qianlai Zhu ,  Joselito D. Parayno ,  Bharat K. Patel

IPC: H02M1/32 ,  H02M1/42

Abstract: A power supply can include a bulk capacitor that receives a DC bus voltage; one or more DC-DC converters that convert the DC bus voltage to a DC output voltage; an inrush current limiting circuit that includes a resistor coupled in series with the bulk capacitor so as to limit an inrush current to the bulk capacitor; and a solid-state switching device that selectively bypasses the resistor once the bulk capacitor is charged; and control circuitry that operates the solid-state switching device to selectively bypass the resistor once the bulk capacitor is charged. The inrush current limiting circuit can further include a relay responsive to the control circuitry that selectively bypasses the resistor under high load conditions once the bulk capacitor is charged; and the control circuitry can further operate the solid-state switching device to selectively bypass the resistor once the bulk capacitor is charged under low load conditions.