基于LLC的梯度加热电源研究

Study on gradient heating power based on LLC

指出了传统的LC串联型和并联型谐振拓扑存在的不足,提出了一种新型LLC型拓扑结构,并对该拓扑结构进行了详细分析。LLC型拓扑结构具有电流变换功能,可以省掉负载谐振变压器,实现负载匹配。同时针对金属工件在挤压过程中摩擦生热,导致前端温度升高的问题,提出了采用多逆变器并联,各区独立控制的方法。该方法可以单独控制每区的温度,从而实现金属工件的横向梯度加热。实验结果表明,该套控制系统温升曲线平滑,能够实现工件的等温挤压,满足生产需求。

The shortcomings of the traditional LC series and parallel resonant topology were pointed out, a new type LLC topology structure was put forward, and the topology structure was analyzed. LLC type topology structure has the current transform function and can realize the load match without load resonant transformer. The temperature of the front-end metal workpiece will rise because of friction heat in the extrusion processes. Therefore, a kind of the inverter parallel and the independent control method was put forward. The method could individually control the temperature of each district in order to achieve the transverse gradient heating of the metal workpiece. The experimental results show that the heating curves of this control system is smooth and it can realize the isothermal extrusion, and meet the production requirements.