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Method for controlling trigger currents that can circulate in a load switch, and corresponding electronic circuit

An inrush current, control circuit technology, applied in emergency protection circuit devices, circuit devices, control/regulation systems, etc. for limiting overcurrent/overvoltage, and can solve problems such as increasing the complexity of electronic circuits and increasing energy consumption

Active Publication Date: 2019-02-01
STMICROELECTRONICS ALPS SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nevertheless, this solution not only increases the complexity of the electronic circuit, but also increases its energy consumption

Method used

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  • Method for controlling trigger currents that can circulate in a load switch, and corresponding electronic circuit
  • Method for controlling trigger currents that can circulate in a load switch, and corresponding electronic circuit
  • Method for controlling trigger currents that can circulate in a load switch, and corresponding electronic circuit

Examples

Experimental program
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Embodiment Construction

[0029] figure 1 The reference numeral 1 in refers to an electronic device, here for example a cellular mobile phone powered by a battery BAT.

[0030] The mobile telephone 1 comprises an electronic system SE implemented in an integrated manner. The electronic system SE further comprises an electronic circuit CE comprising a low dropout voltage regulator 2 , a charging switch circuit 3 , a decoupling capacitor 4 and a charging circuit 5 . The low dropout voltage regulator 2 is of conventional construction and is known by the acronym "LDO" to those skilled in the art. The regulator 2 is coupled between the battery voltage VBAT and ground GND and provides an output voltage VOUT at an output terminal BS.

[0031] The charging switch circuit 3 is coupled between the input terminal BE and the output terminal BS of the low dropout voltage regulator 2 . A decoupling capacitor 4 is coupled between the output terminal BS and ground GND. The charging circuit 5 in this example is a U...

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Abstract

An electronic circuit includes a switch coupled between an input terminal intended to receive a first voltage and an output terminal coupled to a decoupling capacitor and intended to also be coupled to a load. A comparison stage is configured to compare the first voltage and a second voltage that is present at the output terminal. A first adjustment stage is configured to limit a positive inrush current flowing between the input terminal and the output terminal and a second adjustment stage is configured to limit a negative inrush current flowing between the output terminal and the input terminal. A control circuit is configured to activate either the first adjustment stage or the second adjustment stage as a function of a result of the comparison.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from French Patent Application No. 1756995, filed July 24, 2017, which is hereby incorporated by reference. technical field [0003] Embodiments of the present invention relate to methods of controlling susceptible inrush current through load switches, and corresponding electronic circuits. Background technique [0004] Generally, conventional charging switches usually include P-type MOS switching transistors with low threshold voltages. In order to obtain a low resistance in the transistor's "on" state, the P-type MOS transistor is usually rated large relative to other transistors in the same electronic circuit. [0005] Additionally, decoupling capacitors (or "bypass capacitors") are often used to be coupled in parallel to the load. [0006] The charging switch may or may not be connected to a power source. [0007] When the power supply is initially turned on, when the charge swi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/56H02H9/025H02H9/001G06F1/26H02H9/002H01L27/0285H02H9/04
Inventor F·勒邦L·舍瓦利耶
Owner STMICROELECTRONICS ALPS SAS