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<H2 class=center>简单的锂离子电池充电器添加充电状态指示</H2>
<H3 class="center pt10px gray"><SPAN id=ctl00_Main_TechChannelArea>技术分类： <A 
href="http://www.ednchina.com/TechClass/Power/Default.aspx">电源技术</A>&nbsp; 
</SPAN>| 2009-03-04 <BR>Peter T Miller，Applied Inspirations公司</H3>
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<P>　　与其它简单的单芯锂离子电池&nbsp;&nbsp;充电器一样，Microchip公司的MCP73812不提供充电状态指示。可以添加四个元件来改善这种情况（图1）。如果再添加一只<A 
title=LED style="COLOR: blue; TEXT-DECORATION: underline" 
href="http://article.ednchina.com/word/202733.aspx">LED</A>，还可获得充电完成指示。这种双LED配置的额外好处是，一只LED始终接通，表明充电器处于通电状态。<BR></P>
<P align=center><IMG height=311 alt=图1向锂离子电池充电器添加几个元件就可提供充电状态指示 hspace=0 
src="简单的锂离子电池充电器添加充电状态指示 -- EDN电子设计技术.files/3.jpg" width=450 border=0></P>
<P><BR>　　在电池芯处于恒流充电模式时，401 
mA电流会流过1N4001二极管D1。额外的1mA是控制芯片的电源电流。由于1N4001在Q1的基极-射极结之前导电，因此它可防止Q1接通，直到它两端的正向电压达到大约450mV。Q1然后开始导电并接通D2，后者是表明充电状态的红光LED。由于绿光LED的正向电压降一般高于红光LED——2.1V对1.7V，因此D2和Q1两端的电压低于绿光LED 
D3的接通电压，并且它保持关断状态。<BR><BR>　　对于充电周期的最后部分，控制器切换至恒压模式。在电池芯电压接近该4.2V端子电压时，流过D1的电流减弱，并且在15mA~40mA时，两只LED均发光。<BR><BR>　　为几只2N3904晶体管进行了若干测试确定了上述范围。2N4401晶体管参与的测试给出了较低的范围：4mA~18mA。当电流降至低于大约15mA时，Q1关断D2，D3两端的电压开始上升，超过其正向电压阈值，并且表示充电完毕的绿光LED发光。</P><!-- 2009/3/4 22:18:53-->
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