Battery equalizer circuit

Patent · Tue Mar 11 04:00:00 EST 1986

OSTI ID:5777254

Brown, H B

A battery equalizer circuit is described for preparing a battery for charge, consisting of: a battery discharge circuit including resistor means and switch means in series therewith for connection across the terminals of a battery to draw current therefrom when the switch means is closed, control circuit means for opening and closing such switch means, voltage sensing the voltage across the battery terminals, and means actuatable by the sensing means for actuating the control circuit means whereby to close the switch means when the sensed battery voltage is equal to or more than a predetermined upper voltage and for opening the switch means when the sensed battery voltage is in a lower range which is equal to or less than a predetermined voltage which is lower than the upper voltage, the switch means comprising a transistor having its emittercollector terminals in series with the resistor means and a base, the means actuable by the sensing means comprising a Schmitt-Trigger having output terminals operably connected to the transistor base, the voltage sensing means being connected to one input circuit means of the Schmitt-Trigger, regulated power supply means for establishing a reference voltage which is substantially lower than the lower range of voltage and which is connected to another input terminal of the Schmitt-Trigger whereby the latter is flipped ''on'' and the transistor is thereby rendered conductive when the sensed voltage exceeds the reference voltage by a predetermined amount.

• Assignee: Applied Electro Mechanics Inc., Alexandria, VA
• Patent Number(s): US 4575669
• OSTI ID: 5777254
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
250903* -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
BATTERY CHARGERS
BATTERY CHARGING
CURRENTS
ELECTRIC BATTERIES
ELECTRIC CURRENTS
ELECTRIC DISCHARGES
ELECTRIC MEASURING INSTRUMENTS
ELECTRIC POTENTIAL
ELECTRICAL EQUIPMENT
ELECTROCHEMICAL CELLS
ELECTRONIC CIRCUITS
EQUIPMENT
MEASURING INSTRUMENTS
RESISTORS
SEMICONDUCTOR DEVICES
SWITCHES
TRANSISTORS
VOLTMETERS