基于延时环节的串联谐振逆变器锁相控制研究

摘要

锁相控制是谐振式逆变器控制电路的重要组成部分，通过建立串联谐振逆变器锁相环的数学模型，理论上分析了加入延时环节后锁相环系统稳定的条件，并对其动态响应性能进行了仿真分析。针对负载在加热过程中频率升高的现象，提出了一种动态延时的锁相控制方法，仿真和试验结果表明，该控制方法能够加快锁相控制的动态响应速度并保持负载功率因数角的恒定，提高了锁相控制性能。%As an important part of control circuit of the resonant inverter, it is of great significance to study the performance of the phase locked loop. The mathematical model of the phase locked loop is established in this pa-per. The stability conditions for the phase locked loop system with time delay are calculated in theory. And the dy-namic response performance of the phase locked loop is simulated and analyzed. A phase locked control method with dynamic time delay is proposed in view of the phenomenon of the frequency rise during the load heating process. The simulation and experiment results show that the control method can speed up the dynamic response of phase lock control while the load power factor stays constant. And the performance of the phase locked control is improved.