新旧电源管理IC 大PK,大家有什么问题可以写下来
应该说从2003年以来,电源控制IC展示出了全新的面貌.新的隔离控制IC达100余款,非隔离DC/DC达几百款.但是看看我们国内杂志介绍的技术还是老面孔.工程师选用的还是二十年前的老式IC,各位看看你们的手机换了几代了!
我在这里给出几个对比的例子,看看现在的技术进步.
1,PFC控制, UCC28019(ICE1PCS02)取代UC3854.
先看看UCC28019组成的PFC电路,只调节一个放大器的补偿网络即可.
![](http://u.dianyuan.com/bbs/u/81/3470811252544942.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20)
500) {this.resized=true; this.width=500; this.alt='这是一张缩略图,点击可放大。\n按住CTRL,滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/81/3470811252544942.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">
再看看UC3854组成的PFC电路,要调节电压放大器电流放大器和乘法器.
![](http://u.dianyuan.com/bbs/u/81/3470811252544922.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20)
500) {this.resized=true; this.width=500; this.alt='这是一张缩略图,点击可放大。\n按住CTRL,滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/81/3470811252544922.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">
设计步骤减少了好几步!
2, Flyback, NCP1337 PK UC3842
![](http://u.dianyuan.com/bbs/u/81/3470811252545860.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20)
500) {this.resized=true; this.width=500; this.alt='这是一张缩略图,点击可放大。\n按住CTRL,滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/81/3470811252545860.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">
高压起动源直接接在高压输入端,光耦直接接到IC的端子,不再处理放大器的补偿,前沿消隐做在IC内部,IC外部只有电流取样.
![](http://u.dianyuan.com/bbs/u/81/3470811252545868.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20)
500) {this.resized=true; this.width=500; this.alt='这是一张缩略图,点击可放大。\n按住CTRL,滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/81/3470811252545868.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">
有关UC3842的应用电路太多了,看看起动电路,放大器补偿电路,占空比超过50%时另外加入的斜率补偿电路,就知道NCP1337应用起来简单多少了.
如果是DC/DC的应用,可以选择LTC3803,下面是LTC3803的应用电路.
![](http://u.dianyuan.com/bbs/u/81/3470811252545875.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20)
500) {this.resized=true; this.width=500; this.alt='这是一张缩略图,点击可放大。\n按住CTRL,滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/81/3470811252545875.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">
输入输出之间加入光耦隔离也很简单.
3,高压有源箝位Forward, NCP1282 取代UC3843+3714或取代UCC3580.
![](http://u.dianyuan.com/bbs/u/81/3470811252546140.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20)
500) {this.resized=true; this.width=500; this.alt='这是一张缩略图,点击可放大。\n按住CTRL,滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/81/3470811252546140.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">
![](https://dianyuan-public.oss-cn-shenzhen.aliyuncs.com<br>
<br>采用LM5034设计的交互式有源箝位Forward电路可将功率推上1500W.
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<br>采用有源箝位技术的电路为软开关技术,效率高,输出电压纹波小,EMI好处理,具有最好的性能价格比.
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<br>4,全桥ZVS 采用ISL6752 比采用UCC3875(3895),外围元件少,几乎没有占空比的丢失,还控制好了二次側的同步整流.效率比采用UCC3895高出2个百分点以上.
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<br>[img] /bbs/u/81/3470811252546154.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20)
500) {this.resized=true; this.width=500; this.alt='这是一张缩略图,点击可放大。\n按住CTRL,滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('
采用LM5034设计的交互式有源箝位Forward电路可将功率推上1500W.
采用有源箝位技术的电路为软开关技术,效率高,输出电压纹波小,EMI好处理,具有最好的性能价格比.
4,全桥ZVS 采用ISL6752 比采用UCC3875(3895),外围元件少,几乎没有占空比的丢失,还控制好了二次側的同步整流.效率比采用UCC3895高出2个百分点以上.
[img] /bbs/u/81/3470811252546154.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20 ');}" onmousewheel="return imgzoom(this);">
这是ISL6752控制的全桥初级側ZVS开关,此级側ZVS同步整流的电路.
![](http://u.dianyuan.com/bbs/u/81/3470811252546178.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20)
500) {this.resized=true; this.width=500; this.alt='这是一张缩略图,点击可放大。\n按住CTRL,滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/81/3470811252546178.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">
这是UCC3895组成的全桥移相初级ZVS开关,次级无法做到ZVS同步整流.总有MOS的体二极管的导通和反向恢复问题.
5,LLC半桥应用于LCD TV是目前最好的设计.比用双晶Forward电路在LCD TV中效果好多了,不仅效率高,主要是它对屏幕的干扰最小.
6,同步整流技术对效率的提高最有效.两款新的同步整流控制IC 将电源整体效率提高4-8个百分点以上.NCP4302 和IR1167是其中最优秀的品种.下一代PC机效率从80plus升到85plus时,非同步整流技术莫属.
![](http://u.dianyuan.com/bbs/u/81/3470811252545489.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20)
500) {this.resized=true; this.width=500; this.alt='这是一张缩略图,点击可放大。\n按住CTRL,滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/81/3470811252545489.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">
这是NCP4302在二次側做同步整流控制,同时做光耦驱动和反馈.
![](http://u.dianyuan.com/bbs/u/81/3470811252545481.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20)
500) {this.resized=true; this.width=500; this.alt='这是一张缩略图,点击可放大。\n按住CTRL,滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/81/3470811252545481.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">
这是I R1167在二次側低边做同步整流控制.
![](http://u.dianyuan.com/bbs/u/81/3470811252545472.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20)
500) {this.resized=true; this.width=500; this.alt='这是一张缩略图,点击可放大。\n按住CTRL,滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/81/3470811252545472.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">
这是I R1167在二次側高边做同步整流控制.
![](http://u.dianyuan.com/bbs/u/81/3470811252545461.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20)
500) {this.resized=true; this.width=500; this.alt='这是一张缩略图,点击可放大。\n按住CTRL,滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/81/3470811252545461.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">
这是I R1167在对称输出电路中做两侧的同步整流控制.
7,待机功耗问题是个十分重要的问题,过去经常被人们忽略.随着电子设备的大量使用并处于待机状态,必须建立更为严格的待机标准.新的技术方案就是用固定导通时间的FLYBACK控制方法,具体就是要用新的NCP1351取代原有的NCP1200.NCP1351可以达到极低的空载和轻载功耗.下面是应用电路.
![](http://u.dianyuan.com/bbs/u/81/3470811252545451.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20)
500) {this.resized=true; this.width=500; this.alt='这是一张缩略图,点击可放大。\n按住CTRL,滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/81/3470811252545451.png?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">
8,在非隔离的DC/DC中,BUCK电路品种最多,其中最优秀的是加入数字控制的预检测栅驱动技术的TPS40071及其改进后的第二代预检测栅驱动技术的TPS40074.BOOST电路中,加入同步升压驱动的控制器可以达到最高的转换效率.典型产品为LINEAR-TECH公司的LT3782.BUCK-BOOST的产品发展也很快,其中最优秀的品种是LTC3780.INVERTING的推荐产品是LTC3704.
从上面我们可以看一看,新技术的发展是多么迅速,年轻的工程师承们,希望在你们身上.希望你们采用新技术新IC设计出世界最优秀的电源产品