Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Battery charge monitor and fuel gauge










Image Number 7 for United States Patent #5315228.

A battery charge controller and fuel gauge which accurately monitors the voltage, temperature, and charge and discharge current of a rechargeable battery, and calculates the battery's charge capacity and charge level. Each time the battery is fully discharged, any calculated charge level remaining is divided by two and subtracted from the previously calculated charge capacity. When the battery is fully charged, the charge level is set equal to the charge capacity. During subsequent charge and discharge, the current is converted to a coulomb count and added or subtracted from the charge level to maintain an accurate charge level. Fast charge inefficiency due to temperature is considered by subtracting a temperature proportional factor before the charge level of the battery is updated. The charge level, voltage and temperature are used to determine the optimal fast charge termination point to achieve full charge and prevent temperature abuse and overcharge. A fast charge is applied only if the battery is within proper voltage and temperature ranges. The charge controller includes a microcontroller circuit within the same battery pack as the battery, which is powered by the battery when AC power is unavailable. The microcontroller circuit consumes very little power, measures circuit errors to assure data accuracy, times periods of self-discharge and updates the charge level accordingly. The microcontroller circuit also includes memory to store the battery charge information and a communication port to provide the charge information to a computer system connected to the battery pack.








 
 
  Recently Added Patents
Touch screen tablet
Compositions and methods of vascular injury repair
Arrangements and method relating to communication bearers
Method of manufacturing semiconductor devices using ion implantation
Fuel cell system, and electric vehicle equipped with the fuel cell system
Remote management of networked systems using secure modular platform
Serial transmission system including transmitter apparatus and receiver apparatus, for use in transmission of AV data
  Randomly Featured Patents
Symmetric LED array for pulse oximetry
Lignin derivatives, moldings produced by using the derivative, and process for the preparation thereof
Hand held telephone set with separable keyboard
Automatic camera identification from a multi-camera video stream
Radiant fuser for fixing toner images
Laser interferometer displacement measuring system, exposure apparatus, and electron beam lithography apparatus
Manual/pneumatic oil-pumping device
Cryogenic cooler for photoconductive cells
Semi-rigid pontoon
Expandable tubing and method