Yu Hao Electric Co., Ltd. of Beijing Zhongguancun Science Park in Beijing high-tech enterprises, is the main power supply filter manufacturers. Companies can follow the special requirements of customers, design and production specifications of the filter specific products. Our main production 0.5-1500A more than five hundred kinds of specifications of the single-phase (three phase) AC (DC) power supply filter, sine wave filter. Products have been widely used in information security, EMC testing, industrial control, measuring instruments, medical equipment, frequency inverters and power drive systems and other industries. Company passed the ISO9001, 2000 international quality system certification, product by UL, VDE safety regulations and other countries identified, with an annual output of 3,000,000 EMI power filter production capacity, especially for electronic equipment, systems and subsystems conducted EMI, electromagnetic radiation of space for users conducted a number of seminars, chaired by Chinese net for EMC's first and largest national professional website strictly implement the use of EMC ERP management.