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
Selecting one of a plurality of print modes based on pixel coverage of a document
Monitoring cloud-runtime operations
Stability control system with body-force-disturbance heading correction
Sample analysis and/or sample processing system
Polymer bonded fibrous coating on dipped rubber articles skin contacting external surface
Faucet
Method of adenoviral vector synthesis
  Randomly Featured Patents
Iron with steam generator
Process for hydrogenation of carbon-carbon double bonds of a water-soluble olefinically unsaturated carboxylic acid salt
Missiles having means for marking targets destroyed by said missiles to prevent further expenditure of munitions to said target
Single pass ribbon cartridge for impact printers having means to prevent incorrect insertion
Injection device
Direct-pressure type mold clamping mechanism of an injection-molding machine
Chlorite formulations, and methods of preparation and use thereof
Aromatic sulfonyl alkanoates and alkylnitriles
Method of making flash EPROM cell having improved erase characteristics by using a tilt angle implant
Preparation of polyunsaturated ketones