无桥功率因素校正电路电流检测方法的研究

Study of the Current Detection Method for Bridgeless Power Factor Correction Circuit

针对现有无桥功率因素校正电路存在负载适应范围窄的问题,提出了一种新型电流检测电路。该电路由电流互感器、可控开关、整流和反相放大器组成。详细分析了提出电路的工作原理,并搭建样机进行了实验。实验结果表明:提出的方法能在10%额定负载至满载都能保证功率因素在0.9以上。

In order to solve the problem of narrow load range for the existing bridgeless power factor correction circuit,a new current detection circuit is proposed.The proposed circuit consists of current transformer,control switches,rectification and inverting amplifier.Detailed analysis of the proposed circuit work principle,and build an experimental prototype.The experiment results show that the power factor can be guaranteed for more than 0.9 proposed method in 10% of rated load to full load.