【经验】国产AC-DC开关电源芯片KP2123M输入Inrush电流抑制办法
某客户设计一款交流洗地机,主电源AC-DC部分选用必易微电子的AC-DC开关电源芯片KP2123M,设计输入220V,输出12V/2A,在实际测试过程中发现,输入冲击(Inrush)电流过大,实际超过3A,远远大于设计的2A,如果不加以限制会对后级电路造成损害,可能会击穿保险丝,进而烧毁后级元器件,客户现在急需一种可靠的解决办法。本文主要帮助客户设计一种简单可靠的冲击电流抑制方法。
客户设计电路如下:
由于图中输入电容Cin的存在,在实际工作中电容器的瞬态可以是看做短路的,当开关电源上电时,会产生非常大的冲击电流,冲击电流的幅度要比稳态工作电流大很多。
针对当前客户的小功率应用(12V*2A,24W)应用,我们推荐客户采用最简单的串联电阻法。如下图所示:
在AC输入端串联一颗电阻Rin,如果电阻选得大,冲击电流就小,但在电阻上的功耗就大,所以必须选择折衷的电阻值,使冲击电流和电阻上的功耗都在允许的范围之内。虽然方案简单但是对电阻的选择要求很高。
串连在电路上的电阻必须能承受在开机时的高电压和大电流,大额定电流的电阻在这种应用中比较适合,常用的为线绕电阻,但在高湿度的环境下,则不要用线绕电阻。因线绕电阻在高湿度环境下,瞬态热应力和绕线的膨胀会降低保护层的作用,会因湿气入侵而引起电阻损坏。
本例中帮助客户推荐一颗耐压500V,1W的绕线电阻,厚生KNP01W(世强同时代理该电阻),虽然损失部分功率,但是有效的限制了冲击电流,进而安全的保护后级器件,保证系统的正常运行。
在小功率应用场合,我们都可以采用这种简单的冲击电流限制方法,不仅方法简单而且成本还很低,同时稳定可靠。
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描述- 本资料介绍了KP212XM系列多模式主侧调节(PSR)CV/CC电源开关。该系列产品适用于充电器应用,具备高精度CV/CC控制功能。在CV模式下采用AM/FM混合调制方式提高系统效率和可靠性;在CC模式下,利用PFM控制和线路负载CC补偿实现无音频噪声操作和优化的动态响应。内置电缆压降补偿(CDC)功能和多种保护措施。
型号- KP2123M,KP2122M,KP2126M,KP212XM
必易微提供AC-DC转换、DC-DC转换等一站式芯片解决方案用于安防监控,帮助客户打造完整、可靠的电源管理系统
必易微针对安防监控类市场提供多种灵活的DC-DC解决方案,产品覆盖5.5V低压、17V和28V中压以及85V高压;电流从1A到6A等丰富产品来满足各种客户不同的需求。根据架构框图,首先介绍的是通用CV产品:KP522308。
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满足150W内适配器、PD快充、氮化镓快充等主流产品测试需要;并可查看被测开关电源支持协议,诱导多种充电协议输出,结合电子负载和示波器进行高精度测试。测试浪涌电流最大40A。支持到场/视频直播测试,资深专家全程指导。
实验室地址: 深圳 提交需求>
可定制平板变压器、主变压器的开关频率2MHz以内、输入电压1400V以内、输出电压1400V以内,50%以上的产品采用自动化生产,最快3天提供样品、7天交货。
最小起订量: 3000 提交需求>
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