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All colleagues unite and focus their efforts to write a new chapter of developmentWhat aspects should be considered when using lithium‑battery chargers in practical applications?
所属分类： Industry News
发布时间：2020-07-01
Lithium‑battery chargers feature overvoltage and temperature protection.
Lithium battery charger An external current‑limiting charge source and a P‑channel MOSFET enable safe, efficient fast charging of a single‑cell lithium battery. Its key advantage is maintaining very low power dissipation even without an inductor, and it is packaged in an 8‑lead μMAX package. Charging control accuracy reaches 0.75%, supporting pre‑charge and imposing a maximum charging time limit to provide secondary protection for the lithium battery. The charger’s float‑charge mode ensures the battery capacity is fully maximized.
The lithium‑battery charger automatically detects the charging power source and shuts off when no power is available to minimize battery leakage. After initiating fast charging, the external P‑channel MOSFET is turned on; once the battery voltage reaches the set threshold, the system switches to pulse‑charging mode. The on‑time of the P‑channel MOSFET progressively shortens, and upon completion of charging, the LED indicator flashes with a 12% duty cycle. When both the charging source and the battery are within their normal operating temperature ranges, inserting the battery initiates a charging cycle. Charging terminates when either the average pulse‑charging current drops to 1% of the fast‑charge current or when the elapsed time exceeds the chip’s preset charging duration.
Lithium‑battery chargers are specifically designed to charge lithium‑ion batteries. Because lithium‑ion batteries have stringent requirements for charging, they necessitate protection circuitry; accordingly, lithium‑battery chargers typically feature high‑precision control, enabling constant‑current and constant‑voltage charging.
Precautions for Lithium-Ion Battery Chargers
1. Ensure that the charger’s operating mode matches the battery being charged. If a charger designed for lithium‑ion batteries is used to charge nickel‑metal hydride or nickel‑cadmium batteries, the batteries will not fully charge, significantly reducing their runtime. Conversely, if a charger intended for nickel‑based batteries is used to charge lithium‑ion batteries, the lithium cells may become overcharged, severely compromising their lifespan. 2. Be sure to verify whether the battery is truly fully charged when the charger’s full‑charge indicator lights up. Some chargers allow you to remove the lithium battery as soon as the full‑charge light illuminates, while others require the indicator to remain steadily lit before removal.
Charging Process Indication for Lithium-Ion Battery Chargers
When the power is not connected, the LED on the circuit board does not light up.
Connect the power supply to the circuit board; the green LED remains steadily lit, and the board is now waiting for the lithium battery to be inserted.
Once the lithium battery is inserted, charging begins and the LED turns orange.
When the lithium battery reaches a fully charged state, charging stops and the LED turns orange.
Once the lithium battery is fully charged, remove it; the LED will turn green, and wait until the lithium battery is reinserted for charging.
During charging, the percentage of charge is displayed.
LED light:
Green light: Waiting for battery insertion
Solid yellow: Charging
Solid orange: Battery is fully charged or has been charging for 6 hours.
Flashing orange: Warning message (output short circuit, polarity reversed, abnormal temperature)