The Design Principles for the Electrical Safety of Ultrasonic Therapy Equipments by USB Power Supply

Plenty of ultrasonic therapy equipments by USB Power Supply had been developed.Because of its particularity on power supply mode and usage,it is hard to fit the need of GE and IEC.This paper analyses the electrical character of USB,combined with the specialized standard of GB and IEC for the safety of ultrasonic therapy equipments to get its design principles.This work can avoid the failure in designing.