Power supply system, power supply system control method, and circuit board

Patent metadata

Field	Value
Publication number	US-11394193-B2
Application number	US-201816482729-A
Country	US
Kind code	B2
Filing date	Jan 4, 2018
Priority date	Feb 10, 2017
Publication date	Jul 19, 2022
Grant date	Jul 19, 2022

Abstract

A power supply system includes a first circuit board mounting a power source circuit and an electronic fuse and a second circuit board mounting a power consumption circuit and a switch. When the electronic fuse detects an overcurrent due to a failure occurring in the power consumption circuit, the power supply system immediately cuts out an overcurrent flowing through the power consumption circuit while changing the switch from an open state to a short-circuited state according to a fault signal output from the electronic fuse. Accordingly, it is possible to safely separate the first circuit board and the second circuit board, and therefore it is possible to replace the second circuit board with another circuit board mounting a normal power consumption circuit.

First claim

What is claimed is:

1. A power supply system comprising:
a power source circuit;
an electronic fuse having an input terminal connected to the power source circuit and an output terminal configured to output power supplied by the power source circuit;
a power consumption circuit connected to the output terminal of the electronic fuse; and
a switch interposed between ground and a first terminal of the electronic fuse configured to enable a conducted state between the input terminal and the output terminal of the electronic fuse,
wherein the power source circuit and the electronic fuse are mounted on a first circuit board while the power source circuit and the switch are mounted on a second circuit board such that the first circuit board is connected to the second circuit board through a connector, and
wherein upon detecting an overcurrent, the electronic fuse outputs a fault signal at a second terminal thereof toward the switch so as to turn on the switch and to establish a short-circuited state between the ground and the first terminal of the electronic fuse, thus establishing a cutout state between the input terminal and the output terminal of the electronic fuse.

2. The power supply system according to claim 1 , wherein the switch includes a non-volatile memory area, which is configured to hold a value according to the fault signal generated at the second terminal of the electronic fuse and to thereby hold with the cutout state of the electronic fuse.

3. A control method applied to a power supply system including a power source circuit, an electronic fuse having an input terminal connected to the power source circuit and an output terminal configured to output power supplied by the power source circuit, a power consumption circuit connected to the output terminal of the electronic fuse, and a switch interposed between ground and a first terminal of the electronic fuse configured to enable a conducted state between the input terminal and the output terminal of the electronic fuse, the control method comprising:
upon detecting an overcurrent with the electronic fuse, outputting a fault signal at a second terminal of the electronic fuse toward the switch;
turning on the switch to establish a short-circuited state between the ground and the first terminal of the electronic fuse; and
establishing a cutout state between the input terminal and the output terminal of the electronic fuse.

Assignees

• Nec Platforms Ltd

Inventors

• Kitano Masaaki

Classifications

• G01R19/16538

  in AC or DC supplies (G01R19/16519 and G01R19/16528 take precedence) · CPC title

• H02H3/087 Primary

  for DC applications · CPC title

• H02J1/00 Primary

  Circuit arrangements for DC mains or DC distribution networks · CPC title