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Power supply was consisted of several analog parts and various circuits had been conventionally researched before. While, digitalization research of power supply is proceeding, but it has some problem of performance and cost to create digital control power supply. Now the revolution is occurred at energy control area after appearing DSP (digital signal processor). Until now, a power supply was one of component of system. However, the digital control power supply using DSP can realize more intellectual system and power supply is going to change from one of component to a part of system. This paper deals with the evolution of DSP and how to make impact to energy control system. Also, we will consider future application for energy control systems.