Compared with the traditional heating methods, induction heating power supply is more advanced in its high efficiency, energy saving, environmental protection, safety, fast heating speed and easy control, etc. Now it has been widely used in multiple areas of national economy, such as metallurgical industry, machinery manufacturing, food industry and medicine industry, etc. This research is mainly focused on high frequency induction heating power supply based on power density modulation(PDM). Firstly, combin...