Research on Frequency Tracking Capacitive PWM of Induction Heating Power Supply

Author(s):  
Qinghua Xiao ◽  
Jie Zhao ◽  
Mingfa Wang
2014 ◽  
Vol 541-542 ◽  
pp. 445-451
Author(s):  
Yan Fang Li

As the induction heating power was working, its load resonant frequency constantly changes. In order to improve the efficiency of power supply, it requires that the inverter output frequency can follow changes in natural frequency of the load, namely the frequency tracking control. Aiming at the deficiency of the frequency tracking control system, this paper presents a method that the phase locked loop (PLL) tracking system works on real-time control of the output frequency of the power supply,and introduces a phase locked mathematical model which fits the inverter power supply, and offers a simulated analysis by using PSPICE. Through experiments, the system proves to be good at frequency tracking.


2014 ◽  
Vol 1008-1009 ◽  
pp. 663-667 ◽  
Author(s):  
Yan Cui ◽  
Xiao Jun He ◽  
Ze Ping Lin ◽  
Qing Bin Chen ◽  
Wei Hao Yang ◽  
...  

According to the change of resistivity and magnetic permeability of iron load which will influence the resonance frequency in the process of induction heating, this paper presents a frequency tracking system based on the 74HC4046. It can control the output frequency of the power supply in real time, and make the power output frequency to trace the resonance frequency of load. This paper also analyses the phase compensation of the control system, and proposes a new way of phase compensation. The corresponding simulation experiment is done finally. It provides the theory basis to analyze and design an inverter power supply.


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