New Li-Ion Battery Charger Based on Charge-Pump Techniques

Abstract

This paper presents a new Li-Ion battery charger using charge-pump techniques. It has small chip size and simple structure. Besides, the proposed charger provides basic functions with voltage and current detecting, end-of-charge detecting and automatic charging speed control. The charger is operated in mixed method and supported from trickle/large constant-current mode to constant-voltage mode with different charging rates. This charger is implemented in TSMC 035Ztm CMOS process with 5V power supply. Its output voltage is over or equal to 4.2V and maximum charging current reaches 700mA. It has 837mW chip power dissipation and 67.89% power efficiency and chip area is 1.455 x 1.348 mm2 only.

Simulation of battery discharge control schemes

“…В спеціалізованих мікросхемах необхідні вузли можуть бути інтегровані в одному або декількох корпусах, наприклад, мікроконтролер ATmega406 фірми Atmel, або пара bq25504, bq20z80 фірми Texas Instruments [9] це мікросхеми призначені для СКУ батареї з 2-4 послідовно з'єднаних акумуляторів. Вони забезпечують захист акумуляторів від перезаряду, перерозряду, перенавантаження по струму і короткого замикання в зовнішніх колах, виконують вирівнювання зарядів послідовно з'єднаних акумуляторів, здійснюють розрахунок поточної ємності ЛПАБ з урахуванням саморозряду при зберіганні [10].…”

A novel Li-ion battery charger using multi-mode LDO configuration based on 350 nm HV-CMOS

“…However, the design of soft-start increases the area and the complexity of charging controller circuit. In [4][5][6], charge pump technique is utilized in order to optimize the power consumption towards potable applications. This design achieves quite low power consumption but the efficiency is reduced in comparison to other structures.…”

<title>Fuzzy-control-based five-step Li-ion battery charger by using AC impedance technique</title>

“…Rechargeable battery life is relation not only charger times [3,4,5,12,13], But overcharging control and charger way [1,2,6,10,11,16]. We must submit some battery charger with best efficiency [1,2,15,[5][6][7][8][9][10]18,19,20] and more safe from damage of overcharging or under charging. The life cycles of Li-Ion batteries are simply is influenced by overcharge or undercharge, because overcharge can damage the physical elements of the battery and undercharge can decrease the energy capacity of the battery.…”

“…The life cycles of Li-Ion batteries are simply is influenced by overcharge or undercharge, because overcharge can damage the physical elements of the battery and undercharge can decrease the energy capacity of the battery. The Charger controller has duty of creating a feasible electro power for rechargeable battery and it must identify the point that is stopping charging to avoid rechargeable battery explosion [1,2,6,9,10]. The Constant-Current and Constant-Voltage (CC-CV) is used most broadly [1][2][3][4]6,7,9,10,11,13] but its function is cannot give the customer all of their need.…”