Battery charger having automatic deep discharge mode

Patent · Tue Sep 02 04:00:00 EDT 1986

OSTI ID:5201158

Fasen, K R

A battery charger is described for supplying current to a rechargable battery including: a counter having at least first, second, third and fourth counting states occurring repetitively in sequence in response to applied clock pulses. The counter remains in the first counting state in response to an applied reset signal, and provides first, second and third charge control signals indicative of the first second and fourth counting states, respectively; battery charging circuit means responsive to the charge control signals for supplying current to the battery, the current comprising a relatively low trickle charge current in the presence of the first charge control signal, a relatively larger fast charge current in the presence of the second charge control signal, and a deep discharge current in the presence of the third charge control signal; battery voltage sensing means responsive to the terminal voltage of the battery for providing a first mode control signal in response to the battery voltage exceeding a first predetermined reference level, and a second mode control signal in response to the battery voltage falling below a second predetermined reference level; a source of continuous clock pulses for advancing the counter progressively through the first, second, third and fourth counting states.

• Assignee: NOV; EDB-86-174739; NOV-85-023064
• Patent Number(s): US 4609860
• OSTI ID: 5201158
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
250903* -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
BATTERY CHARGERS
BATTERY CHARGING
CONTROL SYSTEMS
CURRENTS
ELECTRIC BATTERIES
ELECTRIC CURRENTS
ELECTRIC DISCHARGES
ELECTRIC MEASURING INSTRUMENTS
ELECTRIC POTENTIAL
ELECTRICAL EQUIPMENT
ELECTROCHEMICAL CELLS
ELECTRONIC CIRCUITS
EQUIPMENT
MEASURING INSTRUMENTS
PULSES
SIGNALS
VOLTMETERS