Sunday, June 12, 2016

Thermal Controlled battery charger

Thermal Controlled battery charge circuit,  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 amplifier's positive input.

thermal controlled battery charger schematic circuit
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.
Part List charger circuit:

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

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