公开(公告)号：US20180219490A1

公开(公告)日：2018-08-02

申请号：US15940644

申请日：2018-03-29

Applicant: STMicroelectronics S.r.I.

Inventor： Andrea Agnes ,  Christian Beia

IPC: H02M7/06 ,  H02M3/07 ,  H04L12/10 ,  H02M7/217 ,  H04L12/40 ,  G06F1/26 ,  G05F3/24

CPC classification number: H02M7/06 ,  G05F3/24 ,  G06F1/266 ,  H02M3/07 ,  H02M7/217 ,  H04L12/10 ,  H04L12/40045

Abstract: An electronic device includes a rectifier bridge that includes an input configured to be coupled to power over Ethernet (PoE) power sourcing equipment (PSE), and an output. A transistor is configured to selectively couple the output with a load. The electronic device includes a maintain power signature (MPS) device, and a control circuit. The control circuit is to maintain the transistor on when a load current is above a threshold, source current from the rectifier bridge to the MPS device when the load current is below the threshold, and switch the transistor to a diode configuration when the load current is below the threshold.