Energy Saving Originals Co., Ltd. (PFC) is a wholly-owned subsidiary of Shell Group; Shell Group was established in 1952 and listed on the Hong Kong Stock Exchange in 1984. The group's R & D team is located in Taiwan and focuses on improving product performance and developing new products and technologies. Discrete power semiconductors use their own proprietary component structures and manufacturing methods developed by the group's internal R & D team. 46 patents registered in the US, Taiwan and China. The group has an independent packaging plant in Shunde, Guangdong.