基于功率优化调节电路的互感器取电输出功率最大化方法

Maximization of Current Transformer Power Extraction Based on Power Optimization Regulation Circuit

基于电流互感器的能量采集器可为大功率线路(如架空线)附近的设备供能,但其存在小电流条件下输出功率较低、大电流条件下易饱和的问题。提出一种采用有源桥同步整流控制策略的功率优化调节电路,其中CT1工作在能量采集模式,可在合适的整流导通角下实现阻抗匹配;CT2工作在电流测量模式,可实现同步整流。通过实验验证表明,所提方法的能量采集效率接近传统副边并联匹配电容方法的效率,当电力线路线电流为20 A时,输出功率为760 mW。

The energy collector based on current transformer(CT)can supply energy to the equipment near the high-power line(such as overhead line),but it has the problem of low output power under low current condition and easy saturation under high current condition.The power optimization regulating circuit using active bridge synchronous rectifier control strategy is proposed.CT1 works in energy acquisition mode and can realize impedance matching under appropriate rectified conduction angle.CT2 operates in current measurement mode for synchronous rectification.The experimental results show that the energy acquisition efficiency of the proposed method is close to that of the traditional parallel matching capacitor method.When the current of power line is 20 A,the output power is 760 mW.