CR2032 button cell batteries

Introduction to the circuit for charging zinc-manganese CR2032 button cell batteries

Circuit for charging zinc-manganese CR2032 button cell batteries

The zinc-manganese dry battery charger has the functions of timing and charging indication. Its charging current is 5OmA and can be used to charge fully sealed ordinary CR2032 button cell batteries with a terminal voltage of 1.35~1/4V.

Circuit working principle

The zinc-manganese dry battery charger circuit consists of a power input voltage stabilizing circuit, a charging circuit and a timing control circuit, as shown in Figure 5-124.

The power input voltage stabilizing circuit consists of a power supply parallel switch S2, a fuse FU1, a power transformer T, a rectifier diode VD, filter capacitors C1, C3 and a voltage stabilizing integrated circuit.

The timing control circuit consists of a timing start button S1, a timing control switch S3, a timing control integrated circuit IC2, resistors R1~R5, a capacitor C2, stop charging indication LEDs VL5, VL6, a transistor V and a relay K.

The charging circuit consists of a potentiometer RP, resistors R6~R13, a charging indication LED VL1~VL4 and a fuse FU2~FU5.

When S2 is turned on, the AC 220V voltage is stepped down by T, rectified by VD and filtered by C3, and one path is used as the input voltage of the charging circuit; the other path is stabilized by IC1 to provide +12V working voltage for IC2.

Press the timing start button S1, and IC2 starts timing; its 3rd pin outputs a high level to turn on V, K is attracted, the normally open contact of K is connected, and the batteries GB1~GB4 start charging, and VL1~VL4 light up at the same time.

S3 is used to set the charging time, and its timing range has 4 levels of 3h, 5h, 7h and 9h. When charging AA type CR2032 button cell batteries, the best charging time is 5h; when charging C type CR2032 button cell batteries, the best charging time is 9h.

When the timing time ends, IC2's 3rd pin outputs a low level, V is cut off, K is released, and the battery stops charging; at the same time, IC2's 2nd pin changes from a low level to a high level, so that VL5 and VL6 light up, indicating that charging is over.

Adjusting the resistance value of RP can change the size of the charging voltage and charging current.

Component selection

R1~R5, R6, R8, R1O and R12 are all l/4W metal film resistors; R7, R9, R11 and R13 are all 1W metal film resistors.

RP is a 2W wirewound variable resistor.

C1 is a monolithic capacitor; C2 is an aluminum electrolytic capacitor with a withstand voltage of 16V; C3 is an aluminum electrolytic capacitor with a withstand voltage of 5OV.

VD is a 1N4004 or 1N4007 silicon rectifier diode.

VL1~VL6 are all φ3mm light-emitting diodes.

V is a S805O or C8050 silicon NPN transistor.

IC1 is a LM7812 three-terminal voltage regulator integrated circuit; IC2 is a ZN1034 timing integrated circuit.

K is a 4098 12V DC relay.

S1 uses a micro push button; S2 uses a 250V power switch with a contact current capacity of 5A; S3 uses a single-pole four-position conversion switch.

T uses a 3~5W power transformer with a secondary voltage of 12~15V.

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