Charger Model: 3634778 Features frequency machine is simple, there is a problem big a) the size of the input and output transformers; 2) for the elimination of large high harmonic output filter size; 3) transformers and inductors produce audible noise ; charging machine (6) 4) poor load and mains changing dynamic response performance 5) low efficiency; 6) Input no power factor correction, power grid more polluting; high 7) costs, especially for small capacity models, can not be compared with the high-frequency machine charger Model:. VOLVO precautions and normal maintenance points under normal usage, the mains charger ESD5520E, the inverter does not work, although other logic control unit is on the Power status ESD5221, but they are low voltage, low power consumption. Mains interruption ESD5550E, inverter power switch working time is relatively short, so the probability of failure is relatively low. Charger failure, mostly due to the user caused by improper use. ESD5550E | Zhongxin Electrical and Mechanical (certified) | ESD provided by the Dongguan City, South City Zhongxin Electrical and Mechanical Services Department. Dongguan City, South City Zhongxin Electrical and Mechanical Services Department (zhongxin888.net.cn) is Dongguan, industrial products leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Electromechanical faithful leadership in the staff warmly welcome all inquiries negotiations to create a better future for electromechanical faithful.