崭新的便携式设备充电技术National Semiconductor

简介：

问：1。我希望在－43～70摄氏度的范围内使用充电电池，锂电池能胜任吗？通过查资料我发现锂电池的低温特性很差，不知能否使用锂电池。
2。我希望能用快速充电器在1～2小时内即将3000mAh以上的电池充满，难度是否很大？
答： Usually Li-ion should be charged between 0C to 50C. You need to consult the Li-ion battery manufacturer for higher temperature charging. This may be done by lowering the charging current.
It is possible to charge a 300mAH Li-ion battery in 2hrs. You wi

问：请问D/A转换后输出达不到要求可能有哪些原因？
答： It may be due to the orignal noise is too big which may be due to op-amp is not good enough.

问：怎么能较精确的检测到电池的容量？通过检测电池开路电压来判断其容量精确度有多高？
答： The circuit will be very complex for detecting the capacity accuracy. The accuracy for detecting the voltage of the battery is not very high in normal. Since the voltage of Lion battery will drop rapidly at the end of life. So, it is accuracy for this appl

问：我公司从事PDA-GPS-GSM的系统集成工作。急需解决用两节镍氢可充电电池对手持设备供电的电路指标如下：电源电压：1.8-2.6V；输出电压：3.3V；输出电流：800mA；电源纹波：<50mV。这个电路最好既可当供电路用，又可当充电路用。
答： Usually, the charger circuit and the power supply is an independ circuit. I suggest to use LP3945/46 for the charger. A boost converter is used to step up the 1.8-2.6V to 3.3V@ 800mA. National Semiconductor have many DC/DC converters. You can contact our S

问：请问这里电压误差和充饱程度比值那部分当中误差是指负误差还是正误差？

答： Both +ve and -ve error affects the performance. -ve error cannot fully charge the battery. +ve error will damage the battery and decrease the charge cycles.

问：看了谢先生的讲解后,获益良多.非常感谢您给予的讲解. 可否再请教一下,对于便携式产品的电池,应如何进行电路保护? 盼复.谢谢.
答： There are two protection circuits. One is for battery cells. One is for charger. For battery cells there are several IC makers provide this part. For charger, it should have over temperature, current and voltage protection.

问：由于LM36XX，LP39XX的充电电压为4。1伏，而有的电池标称电压为3。6伏这样经常过冲对电池有无影响？
答： For Li-ion battery nominal battery voltage is 3.6V but the charge voltage should be 4.1V (or 4.2V). This is normal.

问： 鋰電池充電方法為恆定直流,還是采用脈沖方式?電壓如何控制?
答： It is constant current and constant voltage charger. The voltage is setted according to the battery.

问：请问你所说的通过USB口充电如何实现？ 多谢。
答： There is 5V supply voltae in the USB. The USB charger will use it as it as supply voltage. the other circuit will be similar to the normal one.

问：您好！
请问可充锂电的充电时间与它的容量是否有一个大概的标准。充电时间长会增加它的初期电量，每次都会这样吗？
答： The charger should match with the battery (high capacity rated battery should be charged with a high current charger)
The charge time should not affect the initial battery capacity as long as the battery is fully charged (some chargers may take longer