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Safely deep-discharge NiCd battery - 04/29/99 EDN Design Idea (contains several designs, scroll to find this one)
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. . . . [by
Jim Hagerman, Science & Technology International, Honolulu, HI]
Sailor’s Battery Meter - On a
sailboat, the condition of the battery is a major concern for obvious reasons. On the author’s boat, a 120 Ah
lead-acid battery is charged from a 25 watts solar panel. The battery monitor described here was designed to give
peace of mind. It consists of two sub circuits: a sensor and a control/readoutmust register on this site. . .
[Published in Elecktor July/Augu, 2010]
Shunt
Regulator Monitors Battery Voltage - 09/18/08 EDN Design
Idea A shunt regulator and a handful of associated components function as a battery monitor. . . [by Vladimir
Rentyuk, Modul-98 Ltd, Zaporozhye, Ukraine]
Simple Battery-Status Indicator Uses Two LEDs - 08/12/10
EDN Design Idea Use LED brightness to indicate battery charge. Properly maintained rechargeable batteries can
provide good service and long life. Maintenance involves regular monitoring of battery voltage. The circuit in
Figure 1 works in most rechargeable batteries. It comprises a reference LED, LEDREF, which operates at a constant
current of 1 mA and provides reference light of constant intensity regardless of battery voltage. It accomplishes
this task by connecting resistor R1 in series with the diode. Therefore, even if the battery voltage changes from
a charged state to a discharged state, the change in current is only 10%. . . . [by Abhijeet Deshpande, People’s
Education Society Institute of Technology, Bangalore, India]
Simple car battery
voltage monitor - Automotive, car and motorcycle
electronic circuit diagrams / circuit schematics. . . [G.L. Chemelec]
Simple circuit
disconnects load - 02/17/00 EDN Design Idea Placing a
load-disconnect circuit on the output of a bootstrapped step-up regulator allows the regulator to start with load
currents much higher than would otherwise be possible ( Figure 1 ). During shutdown, the disconnect completely
isolates the battery. . . [by Larry Suppan]
Simple Circuit Disconnects Load from Battery - 03/14/96 EDN Design Idea To prevent battery damage, the circuit in Figure 1 disconnects
the load at a predetermined level of load voltage. This load voltage, VTRIP, is closely proportional to the
battery voltage. R1 and R2 determine the level of VTRIP. . . [by Michael Keagy, Maxim Integrated Products,
Sunnyvale, CA]
Simple
circuit indicates a Low battery - 02/03/14 - EDN Design
Idea It may seem a bit counterintuitive to power on an LED when a battery is already low, but this Design Idea
does it with aplomb. . . [by James Wood]
Simple Circuit Indicates Health of Lithium-Ion Batteries - 05/14/09 EDN Design Idea A simple inexpensive circuit quickly indicates a battery pack's
health. . . [by Fritz Weld, Friedberg, Germany]
Simple circuit monitors battery voltage - 11/21/96 EDN Design Idea The circuit in Figure 1 monitors four NiCd rechargeable batteries
and causes the LED to flash if the voltage of the batteries goes lower than 4V. The circuit consumes only 8 mA of
current under normal operating conditions. IC1 is an eight-pin IC that includes an op amp, a comparator, and a 1.
2V zener diode. The zener diode connects to the negative input of the comparator in the IC as a reference. R6 and
R7 divide the battery voltage. . . [by Yongping Xia, Philips Lighting Electronics Co, Torrance, CA]
Simple circuit
safely deep-discharges NiCd battery - 04/29/99 EDN Design
Idea (contains several designs, scroll to find this one) 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. . . . [by Jim Hagerman, Science & Technology
International, Honolulu, HI]
Solid-state relays simplify monitoring electric car battery-voltage - 02/19/04 EDN Design Idea Figure 1 shows the propulsion system of an electric vehicle. It
includes an electric motor, drive electronics, a mechanical transmission, vehicle control/power management, a
charging system, and a battery. The long-term performance. . . [by Robert Krause, Fairchild Semiconductor, San
Jose, CA]
TRUE RMS-TO-DC Adapter for DVM - The main differences
between one of the application circuits in the AD737 data sheet are the addition of a MCP1702 micropower 3. 3
volt regulator to split the power supply and two 11 volt zener diodes to prevent the voltage across the chip to
become high enough to damage the chip in case the input is connected to an excessive voltage while in the 200 mv
full scale setting. . . . [From Dick Cappels' project pages]
Using the LTC1325 Battery Management Ic - AN64 App Note 64
details characteristics of various battery types and appropriate charging management schemes. The LTC1325 battery
management IC is highlighted along with information for applying it to any type battery. Techniques and circuitry
for conditioning, charging and monitoring NiCd, NiMH, Li-Ion and Lead-Acid batteries are presented. . . .
[Linear Technology]
Voltage Monitor for
a 9v Battery - Nine voltage batteries are used in a
wide variety of electronic devices. But, you often don’t know when it is time to change the battery until the
device stops operating. The hobby circuit below provides a visual indication when the battery needs to be . . .
[Hobby Circuit designed by David Johnson P.E., 07/09/06] |
