单端反激开关电源反馈网络的研究

Research on feedback network of single-stage flyback switching power

根据电路设计指标,针对宽范围输入开关电源响应速度、抗干扰能力、电压调整率等方面的要求,以UC3843为主控芯片设计了一款单端反激式开关电源,并着重对系统的反馈网络进行研究。运用Matlab对改进前后系统的频域性能进行仿真比较,给出了该电源的实验波形。结果表明,该设计电源工作稳定,具有很好的电压调整率、输出纹波小的优点。

According to the designing index of the circuit, in order to improve the responsing speed, the anti-interference ability and the voltage regulation requirements of wide-range input switching power, a single-stage flyback switching power supply based on UC3843 was designed. The research about the feedback network was carried on. The simulation and comparison of the frequency-domain performance about the system before and after improvement were accomplished by Matlab. The experimental waveforms of the power was given. The results show that the power has the advantage of stable work, as well as good voltage regulation rate and small output ripple.