Battery disconnect sensing circuit for battery charging systems

Patent · Tue Jan 28 04:00:00 EST 1986

OSTI ID:6049199

Dattilo, D P

This patent describes a battery disconnect sensing circuit for battery charging systems which have a pair of cables adapted to be connected to a battery to charge it. The sensing circuit contains a first R-C circuit adapted to connect across the cables and a second R-C circuit adapted to connect across the cables. The time constant of the first R-C circuit is substantially greater than that of the second R-C circuit. Also means connected to the RC circuits produced a momentary control signal in response to disconnection of the cables from a battery being charged. Included in a battery charging system is a source of charging current whose voltage output is controlled at a predetermined value when connected to a battery. It increases to a higher value when disconnected from the battery. Controller means connected with the source activate the battery charging system automatically in response to electrical connection of the battery. The improvement consists of: means for momentarily effecting reversal of the higher voltage value, and battery disconnect sensing means connected the charging source and to the controller means for sensing the reversed higher voltage upon disconnection of the battery charger system from the battery and for responding by automatically deactivating the battery charging system.

• Assignee: NOV; EDB-86-086955
• Patent Number(s): US 4567421
• OSTI ID: 6049199
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
250903* -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
BATTERY CHARGERS
BATTERY CHARGING
CABLES
CONDUCTOR DEVICES
CONTROL
CONTROL SYSTEMS
CURRENTS
ELECTRIC BATTERIES
ELECTRIC CABLES
ELECTRIC CURRENTS
ELECTRIC POTENTIAL
ELECTRICAL EQUIPMENT
ELECTROCHEMICAL CELLS
ELECTRONIC CIRCUITS
EQUIPMENT
REMOTE CONTROL
SIGNALS
TIME DEPENDENCE