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Battery Monitors
Page 1b Battery Monitors: #-D
E-R S-Z Last Updated on:
Monday, October 03, 2011 06:08 PM
Circuits Designed by Dave
Johnson, P.E. :
3
VOLT LOW BATTERY VOLTAGE FLASHER
This circuit is designed to monitor two alkaline cells (3v) that form the battery
often used in portable electronic equipment. It use an inexpensive IC from
Panasonic that is connected to an efficient LED flashing circuit. When the
battery voltage drops below a certain point the circuit flashes the LED. In
the off state the circuit draws only 1uA, while in the active flashing state it
draws 20uA. Published in EDN, Jan 2, 1997
9v Battery Voltage Monitor This circuit turns on
a LED whenever the voltage of a standard 9v battery connected to the circuit drops
below 7.2 volts. It uses a LTC1440 comparator, which also contains a 1.18v
reference diode. In standby mode, the circuit draws only 4uA. (added 7/06)
Battery Charge Current Indicator
This circuit turns on a LED whenever it detects at least 25ma of battery charge
current. (added 7/06)
Links to electronic circuits, electronic schematics, designs for engineers, hobbyists,
students & inventors:
Circuit Prevents Deep Discharge of Batteries - 09/26/96 EDN-Design Ideas:
-avoid the deep discharge that can destroy or shorten the life of a rechargeable
Battery, you must disconnect its Load before the discharge is complete to -(added
May02)
Circuit Protects Battery from Overdischarge - 04/12/01 EDN-Design
Ideas:.....(design idea added 10/05) / In some applications, it is undesirable to
Overdischarge the battery, because it could irreversibly reduce the batteries capacity
and the number of discharge/charge cycles. This circuit protects a single NiMH
(nickel-metal-hydride)cell by disconnecting the load from the battery when it gets
discharged enough.
Circuit Safely Deep Discharges NiCd Battery - 04/29/99 EDN-Design Ideas:
Nickel-cadmium (NiCd)batteries can possess an undesirable memory effect due to partial
discharges. The remedy is a complete discharge before charging again. Figure 1a shows
a simple circuit that performs this feat. Although relatively straightforward in
concept, the circuit has three redeeming features: It receives its power from the
battery.....(design idea added 11/05)
