用于水加热装置的高频感应加热电源设计
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摘要
感应加热在金属熔炼、热处理中的应用越来越多,这种先进的加热技术以传统加热技术所不具备的特点而在各行业中得到了广泛的应用。近年来,感应加热装置在家用电器等中小功率应用场合正逐渐增多,而这类应用以水加热装置为主。对于此类感应加热装置,其加热对象一般为金属容器或管道。由于其金属壁厚一般较薄,所以感应加热电源的适用工作频率一般较高。对于高频感应加热电源,如何降低电源成本、减小体积和提高可靠性成为关键。
本文分析和比较了高频感应加热电源常用的主电路拓扑和功率调节方式,并采用不控整流与电压型逆变器的主电路拓扑。引入负载频率跟踪技术与全桥移相PWM功率调节方法结合的控制方案。同时针对高频感应加热电源的负载匹配问题,采用LLC型负载谐振电路代替高频变压器的电磁耦合方法。其中深入研究了LLC型负载谐振电路的阻抗特性和电流变换特性。在理论分析的基础上,使用PSIM仿真环境建立了基于LLC型负载谐振电路的感性移相调功控制的闭环仿真模型,并进行了电源系统的仿真研究。最后,设计了基于LLC型负载谐振电路的高频感应加热电源的主电路和控制电路。其中控制电路采用相移谐振控制器UC3875和集成锁相环CD4046结合设计的方法,有效提高了电源的稳定性。根据设计搭建了实验平台,并进行了实验与调试,完成了系统闭环控制。通过实验证明了本文理论分析与设计方案的正确性与可行性。
Induction heating is applied in metal melting and heat treatment areas more and more, this advanced heating technology with characteristics which are not available in traditional heating technology is widely used in all industries. In recent years, induction heating device in the home appliances such as small and medium-power applications are gradually increased, while the mainly applications are water-heating device. For this type of induction heating devices, the heating object is metal container or a pipe. Because of it wall generally thin, the suit operating frequency of induction heating power supply is generally higher. For the high-frequency induction heating power supply, the key is how to reduce power costs, size and improve the reliability.
In this paper, the high-frequency induction heating power supply commonly used main circuit and power-adjustment method are analyzed and compared. Diode rectifier and voltage inverter are used. Integrate of the load-frequency tracking technology and full-bridge phase-shift PWM power regulation methods are introduced. Simultaneously, for the problem of high-frequency induction heating power supply load matching, LLC load-resonant circuit is used instead of the electromagnetic coupling method of high-frequency transformer. The LLC load-resonant circuit impedance and current transformation characteristics are further studied. On the base of theoretical analyses, the simulation model based on LLC load-resonant circuit and inductive phase-shifting closed-loop power control method is built under the PSIM simulation environment, and the system simulation research was implemented. Finally, based on the LLC load-resonant circuit of high frequency induction heating power supply main circuit and control circuit is designed. Using phase-shift resonant controller UC3875 and integrated PLL CD4046 integrative design control circuit, which effectively improved the stability of power supply. According to the design, an experimental platform is built, and the experiments and tests was implemented, realized closed-loop control system. Experimental results proved that this theoretical analysis and system design is feasibility and accuracy.
本文分析和比较了高频感应加热电源常用的主电路拓扑和功率调节方式,并采用不控整流与电压型逆变器的主电路拓扑。引入负载频率跟踪技术与全桥移相PWM功率调节方法结合的控制方案。同时针对高频感应加热电源的负载匹配问题,采用LLC型负载谐振电路代替高频变压器的电磁耦合方法。其中深入研究了LLC型负载谐振电路的阻抗特性和电流变换特性。在理论分析的基础上,使用PSIM仿真环境建立了基于LLC型负载谐振电路的感性移相调功控制的闭环仿真模型,并进行了电源系统的仿真研究。最后,设计了基于LLC型负载谐振电路的高频感应加热电源的主电路和控制电路。其中控制电路采用相移谐振控制器UC3875和集成锁相环CD4046结合设计的方法,有效提高了电源的稳定性。根据设计搭建了实验平台,并进行了实验与调试,完成了系统闭环控制。通过实验证明了本文理论分析与设计方案的正确性与可行性。
Induction heating is applied in metal melting and heat treatment areas more and more, this advanced heating technology with characteristics which are not available in traditional heating technology is widely used in all industries. In recent years, induction heating device in the home appliances such as small and medium-power applications are gradually increased, while the mainly applications are water-heating device. For this type of induction heating devices, the heating object is metal container or a pipe. Because of it wall generally thin, the suit operating frequency of induction heating power supply is generally higher. For the high-frequency induction heating power supply, the key is how to reduce power costs, size and improve the reliability.
In this paper, the high-frequency induction heating power supply commonly used main circuit and power-adjustment method are analyzed and compared. Diode rectifier and voltage inverter are used. Integrate of the load-frequency tracking technology and full-bridge phase-shift PWM power regulation methods are introduced. Simultaneously, for the problem of high-frequency induction heating power supply load matching, LLC load-resonant circuit is used instead of the electromagnetic coupling method of high-frequency transformer. The LLC load-resonant circuit impedance and current transformation characteristics are further studied. On the base of theoretical analyses, the simulation model based on LLC load-resonant circuit and inductive phase-shifting closed-loop power control method is built under the PSIM simulation environment, and the system simulation research was implemented. Finally, based on the LLC load-resonant circuit of high frequency induction heating power supply main circuit and control circuit is designed. Using phase-shift resonant controller UC3875 and integrated PLL CD4046 integrative design control circuit, which effectively improved the stability of power supply. According to the design, an experimental platform is built, and the experiments and tests was implemented, realized closed-loop control system. Experimental results proved that this theoretical analysis and system design is feasibility and accuracy.
引文
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