Posted by Circuits Arena on Tuesday, 18 November 2014
Increase Maximum Life of 6 Volts or 12 Volts batteries by Monitoring is the artlcle explaining Rechargeable batteries of 6V and 12V are necessity in a huge number of applications. It is compulsory that these are sustain strict...
Rechargeable batteries of 6V and 12V are
necessity in a
huge number of applications. It is
compulsory that
these are
sustain strictly to get
maximum life out of them. Further, their
allowable number of
charge-
discharge cycles must be
completely utilised. Here is a
circuit that
gives a
visible as well as
an
hearable
alarm if the
battery voltage is higher or
lower than
allowable restriction, so that
restriction operation can be taken.
Working:
As shown in Fig. 1, the circuit is made around dual-operational amplifier LM358 (IC1), hex
inverting Schmitt
trigger 74HC14 (IC2) and a few other components. The circuit can be divided into two parts—the input unit build around two operational amplifiers (op amps) in IC1
operation as
comparators, and audio alarm unit build around two RC oscillators and a
transistor.
Voltage from the battery under experiment (BUT) is applied to connector CON1. It is
divided by five
by R1 and R2 for compare with the threshold levels. the power supply of the circuit is restricted to 5V ±2%. SPDT switches S1 and S2
simultaneously selected between the preset threshold for 6V and
12V rechargeable batteries. potentiometers VR1 and VR2 set the maximum permissible input voltage. For example, for a 12V
battery, if you desire to activate the visual and audio alarms at 14.5V, you should put the
potentiometer VR2 reference voltage to 14.5V/5 = 2.9V.
Potentiometers are VR3 and VR4
set the
lowest permissible input voltage. For
example, for a 12V
battery, if you
wish to
activate the
visual and
audio alarms at 10.8V, you should
set the
potentiometer
VR4
reference
voltage to 10.8V/5 = 2.16V. Similarly, you can
get the
reference voltages for a 6V battery by
setting
potentiometers.
