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Thermal Controlled battery charger
Part List :
Resistor
R1_____620K
R2_____43K
R3_____10R
R4_____2K
R5_____0.6R 5W
Capacitor
C1_____1uF
C2_____0.1uF
Diode
D1_____1N4148
D2_____1N4001
Transistor
T1_____2N6387
IC
IC1____LT1001
Thermal Controlled battery charger
One way to charge batteries rapidly without abuse is to measure cell temperature and tapper the charge accordingly. The circuit uses a thermocouple for this function. A second thermocouple nulls out the effects of ambient temperature. The temperature difference between the two thermocouples determines the voltage , which appears at the amplifiers positive input.
As battery temperature rises, this small negative voltage ( 1 degree Celcius between the thermocouples equals 40uV ) becomes larger. The amplifier, operating at a gain of 4300, gradually reduces the current through the battery to maintain its inputs at balance. The battery charges at a high rate until heating occurs and the circuit then tapers the charge. The values given in the circuit limit the battery-surface temperature rise over ambient to about 5 Degree Celcius.
Resistor
R1_____620K
R2_____43K
R3_____10R
R4_____2K
R5_____0.6R 5W
Capacitor
C1_____1uF
C2_____0.1uF
Diode
D1_____1N4148
D2_____1N4001
Transistor
T1_____2N6387
IC
IC1____LT1001
Related Posts : battery,
charger,
controlled,
thermal
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battery,
charger,
controlled,
thermal
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