基于Buck-Boost逆变电路的低纹波可调直流稳压电源控制方法

Control method of low ripple adjustable DC regulated power supply based on Buck-Boost inverter circuit

为克服传统低纹波直流稳压电源的主电路拓扑结构存在电路结构复杂、体积大等不足,提出一种基于Buck-Boost逆变电路的新型可调直流稳压电源拓扑结构,用Buck-Boost逆变环节取代传统结构中高频逆变和变压器升压两个环节,此结构相较于传统结构,在电路结构上可以得到明显的简化。为实现该新型可调直流稳压电源输出低纹波、高稳定度直流电压的要求,针对其Buck-Boost逆变电路提出采用基于比例积分-矢量比例积分的复合控制方法,即以Buck-Boost逆变电路中电容电压和电感电流作为状态变量,并以电感电流为控制内环,电容电压为控制外环,通过对两个闭环采用比例积分-矢量比例积分复合控制方法,实现对两个状态变量的解耦控制,最后通过仿真与实验对其效果进行了验证,同时与传统低纹波直流稳压电源进行了对比分析。结果表明,文中提出的基于Buck-Boost逆变电路的新型可调直流稳压电源拓扑结构及针对该拓扑结构所提出的控制方法不仅输出直流电压纹波小、稳态精度高、动态性能好同时还具有电路结构简单且输出直流电压任意可调等特点,因而具有较好的应用价值。

In order to overcome the deficiencies of the traditional low ripple DC regulated power supply’s main circuit topology,such as complex circuit structure and large size,a new type of adjustable DC regulated power supply topology based on Buck-Boost inverter circuit is proposed to replace the two links of high frequency inverter and transformer step-up in the traditional structure with the Buck-Boost inverter link,which can be significantly simplified in terms of the circuit structure compared with the traditional structure.Compared with the conventional structure,this structure can be simplified significantly in terms of circuit structure.In order to realize the requirement of low ripple and high stability DC voltage output from this new type of adjustable DC regulated power supply,a composite control method based on proportional-vector proportional-integral is proposed for the Buck-Boost inverter circuit,that is,the capacitor voltage and inductor current in the Buck-Boost inverter circuit are taken as the state variables,and the inductor current is taken as the inner loop of the control,and the capacitor voltage is the outer loop of the control,and the two closed loops are decoupled by adopting proportional-vector proportional-integral composite control method.The decoupling control of the two state variables is realized by adopting the proportional-integral-vector proportional-integral composite control method for the two closed loops,and finally the effect is verified by simulation and experiment,and at the same time compared and analyzed with the traditional low ripple DC regulated power supply.The results show that the new adjustable DC regulated power supply topology based on Buck-Boost inverter circuit proposed in the paper and the control method proposed for the topology not only have small output DC voltage ripple,high steady-state accuracy and good dynamic performance,but also have the features of simple circuit structure and arbitrary adjustable output DC voltage,which are of good application value.