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Home > R & D > SMART BATTERY? |
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| Provide exact information of battery(voltage, current,
remaining level, cycle count of battery -> service
life) to the main frame for successful power management
at the main frame. |
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1) Prepared protocols, defining the data set at International
Standard Organization called Smart Battery
.. System forum(www.sbs-forum.org).
Refer to battery system including circuit that complies
with it
.. (almost pack type).
2) Refer to battery system that can indicate the information
of battery system and communicate with
.. application devices(ex:
mobile phone, PDA and camcorder), even if above protocol
is not followed. |
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| Since existing battery determines the battery status
depending on Battery Voltage and temperature, it is not
correct. Since voltage and temperature of battery differ
depending on size of charge/discharge, ambient temperature,
number of battery usage, it is not reliable if based on
voltage and temperature only. Otherwise, it causes wastes
of available capacity, shortening of battery service life,
restriction in charge/discharge. In particular, the biggest
complaint of consumer is the inaccuracy of indication
of battery remaining level. Smart battery is the batter
that solved the above problems by adding intelligent functions
to the existing battery in terms of circuit. |
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Most current makers manufacture battery pack with 1
cell, which corresponds to the capacity of up to 4.2V,
500mAH-1200mAH(Li-ion). When it is charged, big current
is provided continuously in CC, CV mode and is not difficult
to measure the amount of electric charge. In addition,
it is not difficult to measure since big current flows
during communication(call) and it takes long. But, while
in call ready status, low current (under 1mA) flows and
about several dozens mA flows due to synchronization with
station for short time(50~90Ms) at the interval of 5 seconds(Based
on CDMA Profile slot2 mode ). To check it, current measuring
speed and calculation of Smart Chip should be done in
a short time less than about several dozens mS. Since
calculation is required in short time, Cpu Clock increases,
resulting in increasing the current consumed in SmartChip
itself.(STB-A consumes current while swing between 7§Ë
to 134§Ë cycle)
Since the capacity of battery decreases as charging/discharging
cycle increases, it should update by saving capacity information
in non-volatile memory(EEPROM). In addition, it should
be implemented in algorithm suitable to Smart Chip so
that calculation of degradation of battery depending on
battery feature, charge/discharge depth of battery, and
ambient temperature at the time of usage can be used for
upgrade of capacity value, forecast of usable time of
battery. STB-A is shipped while our patented Smart Battery
Firmware is embedded. Our product can be rewritten in
2 k byte flash memory inside the chip.
¡Ø Main Performance of STB-A : Provide exact remaining
level of battery, and increase in usage
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time of mobile communication devices and time to forecast
the
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usable time. |
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