How do you make a 12.6v lithium battery charger?

12.6V lithium battery is made up of three 4.2 V lithium batteries connected in series, so 12.6 v lithium battery charger circuit design can be suitable for lithium battery charger circuit principle diagram.

12.6 v lithium battery charger circuit schematic diagram (a)

This circuit with the function of charging status display, the red light flash is charged, the green flash will soon filled with completely filled with green light. As long as you have 12 V power supply can be, don't install batteries, after taking the circuit the lower right corner of adjustable resistance, make the battery output is 4.2 V, and the lower left corner of the adjustable resistance make LM358 3 feet is 0.16 V, the charging current is 380 ma, super-fast, three diode is dropping, and even prevent the LM317 overheating, and the LM317 are required to add heat sink, the triode in the graph can be any type.

12.6 v lithium battery charger circuit schematic diagram (2)

As shown is a kind of constant current constant voltage of lithium battery panel, figure in Q1, R1, W1, TL431 precision adjustable voltage regulator circuit.Q2, W2 and R2 adjustable constant current circuit.Q3, R3 and R4, R5, LED charging indicator circuit. With be rechargeable lithium battery voltage gradually rise, charging current will reduce gradually, after waiting for the battery pressure drop on the R4 constantly decreases, and eventually make the Q3 ended, LED out, can in order to ensure that the battery is enough, please continue to charge 1 ~ 2 hours after lights out, the need when using in Q2, Q3 with appropriate size heat sink.

12.6 v lithium battery charger circuit schematic diagram (3)

Shown in charging device principle circuit diagram, the maximum output current of 20 a, maximum charge voltage is 80 v. It can be adjusted from 0 v, for all kinds of battery charging, and can also be for the same specifications of the rechargeable battery or battery series, such as a maximum of five series of 12 v battery recharged at the same time. Series of battery charging, can shorten the length of the attachment, reduce line loss, convenient connection, thus can greatly improve the work efficiency.

From the figure, the transformer T provide working voltage for double-base tube V1, double-base tube V1 and corresponding peripheral components of an oscillator, oscillation frequency can be controlled by the RP1, RP2.In this circuit, RP1, RP2 value is large, so in practice, a RP2 coarse adjustment role, RP1 fine tuning role, this is especially important when on a single battery charge, can avoid damage to the battery. Oscillation pulse produced by V1 VD3 isolation, touch the hair crystal thyratron VS, the size of the charging current and voltage depends on the output pulse oscillator, which is determined by the oscillation frequency.R5 sampling resistor, the large current meter, if within ammeter with sampling resistor, saves the R5.R6, C2 is to protect the damping element with the meter.

The actual selection of element parameters as shown in figure, transformer T available power is 5 w, output voltage is 24 v or so any type of transformer, if short of 0 ~ 80 v, output voltage maximum current amounted to less than 20 a, can switch to another double-base diode, also can use in thyristor trigger higher sensitivity. Especially it is important to note: phase line and zero line connection according to the picture; After the actual operation, be sure to pick a good battery can only be connected power supply; After charging, should be cut off power supply, then remove the battery attachment. The machine fault is bigger interference on the grid, conditional word, can make a powerful filter, to reduce the disturbance to the grid.

12.6 v lithium battery charger circuit schematic diagram (4)

As shown in figure for lithium battery fast automatic charger circuit. Lithium battery can be large current charging, but single section lithium battery charging voltage of the maximum value no more than 4.2 V, if more than 4.5 V, it may cause permanent damage. Lithium battery discharge voltage shall be not less than 2.2 V, otherwise will may cause permanent damage. This circuit adopted LM3420-8.4 special lithium battery charging controller. When battery voltage is lower than 8.4 V, LM3420 output terminal (1) the foot (OUT) the output current, transistor Q2 deadline, therefore, adjustable voltage stabilizer LM317 output constant current, its current value depends on the value of RL.

LM317 rated current is 1.5 A, if you need more charging current, can choose LM338 or LM350.In the process of charging the battery voltage will be rising. Battery voltage be LM3420 foot (4) of the input (IN) detection, when the battery voltage rises to 8.4 V (two lithium batteries), LM3420 output terminal (1) the feet have the output voltage, makes the control of Q2 LM317 into constant-voltage charging process and the battery voltage stability IN 8.4 V, then start charging current is reduced, lithium battery, after sufficient electricity charging current dropped to a trickle charge.

When the input voltage interrupts, transistor Q1 is closed. The battery pack with LM3420 disconnect, and the role of the diode D1 can avoid battery discharge through the LM317.

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