DataSheet8.cn


PDF ( 数据手册 , 数据表 ) AN026

零件编号 AN026
描述 The Charger Design with SEPIC Converter
制造商 AIC
LOGO AIC LOGO 


1 Page

No Preview Available !

AN026 数据手册, 描述, 功能
AN026
The Charger Design with SEPIC Converter
Introduction
Recently, the hand-held devices become more and
more popular, such as Personal Digital Assistant
(PDA), CD workman, digital camera etc… need a
great quantity battery for normal operation.
Considering the economic effect, the battery chargers
for recycle rechargeable battery, like NiMH or NiCd,
are extremely important. In this article will introduce
the design idea of charger circuit at first. Then directed
against the characteristics of rechargeable battery and
use AIC1781 to design a charge protector only for
NiMH/NiCd battery.
Design Idea of Battery Charger
I’ll give an example to illustrate the relationship
between rechargeable battery and battery charger.
Assume that the battery is a cup, and regards the
constant current, which from charger, as the water
pour into the cup. The more water pour into the cup,
the more volumes will be in the cup. Contrast with the
battery and charger, the more current flow into the
battery the more battery voltage will be appeared.
Therefore we can use this concept to design an ideal
charger.
The ideal charger must provide following
characteristics:
When the battery voltage achieves it’s maximum
voltage, the charger must be turn off to prevent
damaging the device, which connect to battery.
It can supply a constant current to the battery. And
terminate the charge current when the battery voltage
October, 2003
doesn’t increase any more or decreases cause the
saturation voltage.
It must terminate the charge current when the charge
time is too long to prevent damaging the device.
It must provide a function of discharge- before-charge
to precondition the battery, which suffer from “memory
effect”.
When the battery terminate charge, the charger must
supply a trickle charge current to prevent the loss of
battery due to it’s self-discharging.
When the battery voltage is lower than the initial
voltage, the charger doesn’t proceed charging due to
estimates the battery hasn’t put in or broken. When
the battery voltage is higher than the initial voltage, the
charger supplies a constant current to battery for fast
charging. When the battery voltage achieves the
saturation voltage, the charger terminates fast
charging. After fast charging, the charger supplies a
trickle current to prevent the loss of battery due to it’s
self-discharging. Fig. 1 illustrates the characteristics of
charger.
Charge Voltage
Maximum
Saturation
Battery Voltage
Trickle Current
Charge
Current
Initial Voltage
Terminate Charge
Time
Fig.1 The charge curve of charger
1












页数 7 页
下载[ AN026.PDF 数据手册 ]


分享链接

Link :

推荐数据表

零件编号描述制造商
AN020The Power Management of PDAAIC
AIC
AN021A Handy Method to Obtain Satisfactory Response of Buck ConverterAIC
AIC
AN022High Side DriverAIC
AIC
AN023An Useful Model for Charge Pump ConverterAIC
AIC

零件编号描述制造商
STK15C88256-Kbit (32 K x 8) PowerStore nvSRAMCypress Semiconductor
Cypress Semiconductor
NJM4556DUAL HIGH CURRENT OPERATIONAL AMPLIFIERNew Japan Radio
New Japan Radio
EL1118-G5 PIN LONG CREEPAGE SOP PHOTOTRANSISTOR PHOTOCOUPLEREverlight
Everlight


DataSheet8.cn    |   2020   |  联系我们   |   搜索  |  Simemap