基于UC3875的双闭环控制稳流型开关电源

Double Closed-loop Controlled Stabilized Current Switching Power Supply Based on UC3875

在建立全桥移相PWMDC/DC开关变换器小信号模型的基础上,研究稳流型开关电源的双闭环控制系统,并给出其电路组成和数学模型,通过Matlab对控制系统进行校正。根据双闭环控制系统,设计了基于UC3875的控制电路。最后的仿真和实验结果表明,在小信号模型基础上设计的UC3875双闭环控制系统可以稳定运行,有较强的实用性。

Based on the small signal model of full-bridge phase-shifted DC/DC converter, the double closed-loop control system of stabilized current switching power supply is developed to derive its structure and mathematic model. The control system is revised by Matlab software. According to the double closed-loop control system, controlled circuit is designed based on UC3875. Final simulation and experimental results show that the double closed-loop control system is steady and quite practicable.