Composed of lithium iron phosphate battery charging module and lithium battery charging circuit design. Lithium iron phosphate batteries have higher charging and discharging requirements and can be charged using dedicated constant current and constant voltage chargers. Since lithium batteries have no memory effect, they are currently used in various handheld devices.

　　Composed of lithium iron phosphate battery charging module and lithium battery charging circuit design. Lithium iron phosphate batteries have higher charging and discharging requirements and can be charged using dedicated constant current and constant voltage chargers. Since lithium batteries have no memory effect, lithium batteries are currently used in various handheld devices and portable electronic products. The charging management ICs currently on the market are all designed according to the charging characteristics of rechargeable batteries.

　　Lithium iron phosphate battery charging module circuit composition

　　The general charging module for lithium iron phosphate batteries is composed of a charging current sampling circuit, a charging switch tube, an integrated control circuit, and a charging voltage sampling circuit. The charging sampling circuit can set the constant charging current of the charging module according to the capacity of the lithium iron phosphate battery to be charged. For example, when charging a single 4Ah lithium iron phosphate battery for a miner's lamp, the current can be set at 800mA; for a notebook computer, use 10Ah phosphoric acid. When charging the lithium iron battery, the current can be set to 3A. The voltage sampling circuit can set the constant charging voltage output by the universal charging module according to the number of series cells in the lithium iron phosphate battery pack to be charged.

　　For example, when charging a single lithium iron phosphate battery for a miner's lamp, the voltage should be set at 3.65V. When charging a mobile DVD with two series-connected lithium iron phosphate battery packs, the voltage should be set at 7.3V. When charging an electric moped with 11 When charging the lithium iron phosphate battery pack in series, the voltage should be set at 40V. The function of the integrated control circuit is to achieve optimal charging of the lithium iron phosphate battery by controlling the switch. After charging starts, the lithium iron phosphate battery is charged with a constant current. When the battery voltage reaches the set constant charging voltage, it automatically switches to constant voltage charging to ensure that the lithium iron phosphate battery is safely, quickly and fully charged. The charging switch uses MOSFET, and the rated current value of the MOSFET can be selected according to the set charging current.

　　In order to reduce the size of the universal charging module, the module is made using a thick film process. All resistors, capacitors and leads are printed on the ceramic substrate. The integrated circuit MOSFETs and diodes are mounted on the ceramic chip using die. This module can also be surface mounted to mount various components on aluminum-based circuit boards.

　　TP4056 is a complete single-cell Li-ion battery with constant current/constant voltage linear charger. Its SOP8 package with heat sink on the bottom and low external component count make the TP4056 ideal for portable applications. TP4056 can work with USB power supply and adapter power supply.

　　Lithium battery charging circuit design

　　According to the structural characteristics of lithium batteries, the maximum charge termination voltage should be 4.2V and cannot be overcharged. Otherwise, too many lithium ions from the positive electrode will be taken away and the battery will be scrapped. Its charging and discharging requirements are relatively high, and a dedicated constant current and constant voltage charger can be used for charging. Usually, constant current charging reaches 4.2V/section and then it switches to constant voltage charging. When the constant voltage charging current drops to less than 100mA, charging should be stopped. Battery capacity (for example, for a 1350mAh battery, the charging current can be controlled between 135 and 2025mA). The conventional charging current can be selected to be around 0.5 times the battery capacity, and the charging time is about 2 to 3 hours.

　　Due to the internal structure of the lithium battery, all lithium ions cannot move to the positive electrode during discharge. A part of the lithium ions must be retained at the negative electrode to ensure that the lithium ions can be inserted into the channel smoothly during the next charge. Otherwise, battery life will be shortened accordingly. In order to ensure that some lithium ions remain in the graphite layer after discharge, the minimum discharge termination voltage must be strictly limited, which means that the lithium battery cannot be over-discharged. The discharge termination voltage is usually 3.0V/section, and the minimum cannot be lower than 2.5V/section. The length of battery discharge time is related to battery capacity and discharge current.

　　The principle of lithium battery charging circuit

　　Principle: Use constant voltage to charge the battery to ensure it will not be overcharged. The input DC voltage is 3 volts higher than the voltage of the battery being charged. R1, Q1, W1, and TL431 form a precision adjustable voltage stabilizing circuit, Q2, W2, and R2 form an adjustable constant current circuit, and Q3, R3, R4, R5, and LED are charging indication circuits. As the voltage of the charged lithium battery increases, the charging current will gradually decrease. After the battery is fully charged, the voltage drop on R4 will decrease, causing Q3 to cut off and the LED to go out. To ensure that the battery is sufficient, please wait until the indicator light goes out. Continue charging for 1-2 hours. Please install appropriate radiators for Q2 and Q3 when using them.

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