【经验】基于国产开关电源芯片KP2126DP的开关电源如何提高输出效率、减少损耗？

时间： 2021-06-29 来源：世强

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某客户设计一款洗碗机，主电源采用必易微电子的开关电源芯片 KP2126DP作为控制芯片，输入220VAC，输出12V/2A，在实际测试中发现输出效率只有85%左右，按照客户实际需求，效率需要做到90%以上，本文主要帮助客户分析开关电源中的损耗，并提出改进方法。

客户的实际应用电路如下：

开关电源的损耗包含很多情况，比如输入部分，高压启动产生的损耗，图中Rst1和Rst2工作中产生的损耗，RCD吸收电路产生的损耗，如下图所示：

由于电阻的存在，每次开关都会产生损耗。

本文主要从RCD电路入手，通过调整RCD吸收电路的设计来减小开关电源的损耗。

正常情况下变压器的漏感吸收都会采用RCD吸收电路来实现，我们也可以应用TVS管来实现，如下：

电路中C29电压保持在最高200V，因为相对于上图中RCD电路，C29没有放电回路，当然就不会存在放电损耗，这样R37上的损耗就不会存在，该电路中的RC只是改善电源的EMC。当然这只是提高开关电源效率的一种方法，在实际应用中可以灵活根据电路结构调整，比如将高压启动电路设计为辅助绕组启动，降低变压器漏感等等。

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良工推出了一款67W输出功率的氮化镓快充插座，这款快充插座自带1.5米长电源线，具备两个新国标五孔插孔和一个双孔插孔，并设有总控开关和LED电源指示灯。整流桥来自深圳市沃尔德实业有限公司，型号WRLSB80M；非隔离供电芯片来自必易微，型号KP15051。

2024-07-23 - 应用方案

必易微（KIWI）IOT领域电源管理芯片产品介绍

描述- 本文介绍了必易微电子在IOT领域电源管理芯片的产品。内容包括公司基本信息、智能硬件系统构成、电源管理解决方案、五大核心技术、产品选型表等。重点介绍了必易微电子在高压700V混合BCD工艺、平台化产品、系统架构、高功率密度电源、超低待机、低功耗等方面的技术优势。

型号- KP2190,KP311AWPA,KP20H,KP3281DP,KP2191,KP4110-1-2,KP2192,KP212,KP86888,KP3116WPA,KP2501,KP86884,KP206A,KP216,KP3210BSGA,KP206B,KP214,KP3224DP,KP3205SGA,KP3310,KP3126SG,KP23111,KP2182,KP23110,KP101,KP201E-H,KP15026VPA,KP86888S,KP3110-2-4-6,KP201A-H,KP3116SGA,KP22306,KP322XDP,KP216X,KP15012SPA,KP23132M,KM8684NQ,KP3221DP,KP3282DP,KP15026,KP3310DPA,KP3210-1-2B,KP3211BDP,KP2201-B,KP2326,KM868X,KP1513,KP3114WPA,KP146X,KP2164,KP206A-B,KP2162,KP2202,KP3120SPA,KP2161,KP201,KP18026,KP15026WPA,KP3112LGA,KP214X,KP2182X,KP206,KP3114SGA,KM8688NQ,KP4055,KM8684NS,KP3126,KP226X,KP2061-4,KP23266,KP15014SPA,KP23264,KP4051,KP201-E-F,KP1511X,KP3210SGA,KP322X,KP201X,KP321ABSGA,KP3110,KP3222DP,KP1452,KP3221SG,KP4124X,KP2313X,KP201H,KP23133M,KP201F,KP18051ESPA,KP41242,KP3211BSGA,KP41240,KP41241,KP23152,KP15012-4,KP3210BDP,KP23151,KP201A,KP23150,KP1512X,KP201E,KP201B,KP201C,KP212X,KP36673-4,KP35015,KP3221SGA,KP2010,KP2131,KP3310SPA,KP3112SGA,KP2011,KP2132,KP2130,KP2012,KP2013,KP3284DP,KP3126SGA,KP18061ESPA,KP1315X,KP3110SPA,KP2126,KP4050-A,KP18055ESPA,KP2801,KP142X,KP1030,KP2120,KP2124,KP328X,KP2122,KP311ALGA,KP23133,KP18069,KP23132,KP3212BDP,KP226XH,KP41240-1-2,KP141X,KP401,KP2591,KP21821-2-4,KP206X

2020-07 - 必易微 - 商品及供应商介绍代理服务技术支持采购服务