PYDG heater industry, a high-tech company, develops high-tech products and realizes the industrialization of scientific achievements. The company specializes in development and production of high/medium-frequency induction heating equipment. With completely self-developed technologies, the company takes scientific innovation as the first driving force of company development, and under the philosophy of "Serving the Society with Technology", develops high/medium-frequency induction heating equipment by virtue of its professional spirit. Its products realize modularization, integration, and automation by employing new-type high-power electronic devices of factories such as IGBT, MOSFET. The oil immersed transformer the company made in 2000 solved heat dissipation and insulation problems of output transformers when load duration factor of mini high-frequency power supply is 100 percent, which raised power and was applied to heat treatment of hot heading screws, nuts, hot rolling twist drills, mechanical parts, etc.