Battery time monitor for cellular telephone

• US 5,248,929 A
• Filed: 04/30/1992
• Issued: 09/28/1993
• Est. Priority Date: 04/30/1992
• Status: Expired due to Fees

• Current Assignee: Murata Machinery Limited (Muratec)
• Original Assignee: Murata Machinery Limited (Muratec)
• Inventors: Burke, Timothy M.
• Primary Examiner(s): Peckman, Kristine L.
• Application Number:
  US07/876,102
• Time in Patent Office: 516 Days
• Field of Search: 320/13, 320/43, 320/44, 320/48, 324/426, 324/427, 324/435, 340/636
• US Class Current: 320/127
• CPC Class Codes: G01R 31/3648 comprising digital calculation means, e.g. for performing an algorithm
• CPC Class Codes: G01R 31/3832 without measurement of battery voltage
• CPC Class Codes: H01M 10/48 Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569
• CPC Class Codes: H04M 1/04 Supports for telephone transmitters or receivers
• CPC Class Codes: H04M 1/6041 Portable telephones adapted for handsfree use
• CPC Class Codes: H04W 52/0261 managing power supply demand, e.g. depending on battery level
• CPC Class Codes: Y02D 30/70 in wireless communication networks
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y10S 320/21 State of charge of battery

Abstract

A battery monitoring system for a cellular telephone which provides the user with a real time display of the amount of time remaining for use of the cellular telephone in both the standby and conversation modes. The amount of time may be calculated directly from the rate of discharge of the battery or from stored conversion factors corresponding to various states of charge of the battery.

Claims

1. In a cellular telephone having a first mode of operation and a second mode of operation and including a battery defining a state of charge, a device for monitoring the state of charge of the battery, the device comprising:

measuring means for substantially continuously measuring the state of charge of the battery and for generating a charge value corresponding to the state of charge of the battery,

storage means for storing the charge value,

determining means, responsive to the storage means, for using the charge value to determine a first amount of time remaining for use of the battery in the first mode of operation and a second amount of time remaining for use of the battery in the second mode of operation, and

display means, responsive to the determining means, for providing a real time display of the first amount of time remaining and the second amount of time remaining,

whereby the device provides a dynamic indication of the amount of time remaining for use of the battery in the first mode of operation and the amount of time remaining for use of the battery in the second mode of operation.