【经验】用于温湿度控制器的多模式恒流恒压原边控制功率开关KP2126如何抑制输出电流尖峰？

时间： 2021-08-17 来源：世强

技术问答

某客户设计一款温湿度控制器，主控电源采用必易微的多模式恒流恒压原边控制功率开关 KP2126，220VAC输入，输出12V/100mA，在测试电流时发现在满载输出时电流尖峰较大，导致后面控制板出现间歇性重启，长时间会导致整个控制板被击穿失效，本文帮助客户提供一种简易低成本的尖峰抑制方案。

客户应用电路如下：

上图为客户设计的主电源电路，输出12V，同时考虑到输出可控，客户在输出电路部分增加了SB控制电路如下：

通过Standby控制Q1通断，进而控制输出电压，但是在测试Rload电流时，在100mA时电流尖峰较大。

通过分析电路，建议客户在Q1集级增加电容C1，如果没有C1，在Q1导通时电流直接向负载C2电容充电，增加C1可以可限制Q1集电极的dv/dt值。dv/dt值越小，流入C2的充电电流就越少。为C1指定电容值，使得Q1的理想输出dv/dt值与C1值相乘等于流入R1的电流。

这种方法可以基本不用改动电路，同时成本非常小，非常适用于简单的电流尖峰抑制。

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