Method and apparatus for distinguishing momentary loss of battery contact from an undervoltage condition,申请号US201414319560-传众专利搜索

Method and apparatus for distinguishing momentary loss of battery contact from an undervoltage condition

申请公布号：US9348398(B2)

申请号：US201414319560

申请日期：2014.06.30

申请公布日期：2016.05.24

申请人：

MOTOROLA SOLUTIONS, INC.

发明人：Abdullah Mohd Faisal;Ng Kean Giap;Tan Beng Kwang

分类号：G01N27/416;G06F1/32;G01R31/36;G01R31/02

主分类号：G01N27/416

代理人：Garrett Scott M.

地址：Schaumburg IL US

摘要：A method and apparatus for distinguishing momentary loss of battery contact from a battery undervoltage condition in a portable device sense the current into the portable device from the battery, and when the current drops to a level indicating that contact with the battery has been lost, the portable device is allowed to operate at a lower voltage than a nominal undervoltage limit of the battery until contact is resumed.

主权项：1. A circuit for distinguishing momentary loss of battery contact from a battery undervoltage condition in a portable device, comprising: an undervoltage sensing circuit that senses a battery voltage provided at a battery contact of the portable device and compares it to an undervoltage reference voltage level corresponding to an undervoltage limit and provides an undervoltage signal to a controller of the portable device when the battery voltage falls below the undervoltage limit; a current sensing circuit that senses current into the portable device from the battery, and provides a low current signal while the current is below a current threshold; and a reference adjustment circuit that compares the low current signal with a power on flag provided by the controller of the portable device indicating the portable device is powered on, wherein the reference adjustment circuit lowers the undervoltage reference voltage level to a reduced value only while the low current signal indicates the current is below the current threshold and the power on flag indicates the portable device is powered on.