US 11,637,420 B2 · Overcurrent protection circuit

Abstract

In order both to accommodate instantaneous current as well as overcurrent protection in accordance with the load, an overcurrent protection circuit has: a threshold value generation unit that, in accordance with a threshold value control signal, switches between setting an overcurrent detection threshold value to a first set value (∝ Iref) and a second set value (∝ Iset) lower than the first set value; an overcurrent detection unit that compares a sense signal in accordance with the current being monitored and the overcurrent detection value and generates an overcurrent protection signal; a reference value generation unit that generates a reference value (∝ Iset) in accordance with the seconds set value; a comparison unit that compares the sense signal and the reference value, and generates a comparison signal; and a threshold value control unit that monitors the comparison signal, and generates a threshold value control signal.

Claims12

Dependent claims

An overcurrent protection circuit comprising:

an overcurrent detector configured to compare a sense signal in accordance with a monitored current with a variable overcurrent detection threshold and generate an overcurrent protection signal;
and
a comparison section configured to compare the sense signal with a reference value in accordance with the variable overcurrent detection threshold and generate a comparison signal.

An overcurrent protection circuit comprising:

an overcurrent detector configured to compare a sense signal in accordance with a monitored current with a variable overcurrent detection threshold and generate an overcurrent protection signal;
and
a comparison section configured to compare the sense signal with a reference value in accordance with the variable overcurrent detection threshold and generate a comparison signal,
wherein:
the monitored current includes a first monitored current and a second monitored current,
the sense signal includes a first sense signal and a second sense signal,
the variable overcurrent detection threshold includes a first variable overcurrent detection threshold and a second variable overcurrent detection threshold,
the overcurrent protection signal includes a first overcurrent protection signal and a second overcurrent protection signal,
the reference value includes a first reference value and a second reference value,
the comparison signal includes a first comparison signal and a second comparison signal,
the overcurrent detector includes a first overcurrent detector and a second overcurrent detector, and
the comparison section includes a first comparison section and a second comparison section.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application

17/503,907Filed 18 Oct 2021 · continuation

Priority

JP 201609058528 Apr 2016

Published

US 2022/0037872 A13 Feb 2022

Granted

25 Apr 2023

Term ends

Not estimatedThe source records don’t support an estimate.

Classification11 codes

H02H 1/0007
Details of emergency protective circuit arrangements: concerning the detecting means
H03K 17/0822
By feedback from the output to the control circuit: in field-effect transistor switches
B60R 16/02
Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits…:…
B60R 16/03
Electric constitutive elements: for supply of electrical power to vehicle subsystems or for

Family

PCT/JP2017/008536Parent of this continuation · filed 3 Mar 2017

Application17/007,662Parent of this continuation · filed 31 Aug 2020

US 10,790,657 B2Parent of this continuation · filed 29 Sep 2020

US 2022/0037872 A1Pre-grant publication · published 3 Feb 2022

US 11,183,829 B2Parent of this continuation

Application16/088,934Parent of this continuation

US 2019/0123541 A1Published application

US 2020/0403393 A1Published application

US 11,637,420 B2This patent

From the US filing history. Foreign family members aren’t listed.

Overcurrent protection circuit

Life of this patent

Overcurrent protection circuit

Life of this patent

Abstract

Claims12