As we move away from an analog phone now for digital phone, the Ibm thinkpad z61e battery is facing new demands. The analog equipment draws a current, while the digital telephone charges the battery by short and high voltage spikes. The satellite phone as used in Europe and Asia for example, draws 1.7 A of current when it transmits at maximum power. Figure 1 shows the typical capacitance load of phone GSN.
Figure 1: The standard wave moving GSN transmits voice into packets of 567 microseconds at a time of 4.61 milliseconds. The peak currents vary depending on signal strength and reach 1.7 amperes in fringe areas.
The low internal resistance is one of the most urgent needs for a digital cellular phone battery. Measured in milliohms (mO), the internal resistance is the controller of the thinkpad t60 battery, to a certain extent, determines the duration of the conversation. More resistance is low, the battery is less restricted by providing the necessary current spikes. A high reading of mO often turn indicator on a battery discharge apparently properly loaded, because the energy available can be fully furnished and remains in the battery.
In Figure 2, we study the cellular phone system in the world's most popular and compare the peak power and peak power requirements of the thinkpad t400 battery must provide. These systems are the GPA, the SNB, the TDMA and CDMA.
* Some phones are TDMA handset with dual-mode (analog load 800 mA DC, 1500 mA digital impulse load).
** The current varies depending on thinkpad r61e battery voltage: 3.6 V battery requires a higher current than a battery of 7.2 V.
Figure 2: The global cellular phone system and the needs of peak power.
没有评论:
发表评论