Design of a suppression device with changeable clamping voltage based on TVS array

Impulse influences power system and electrical equipments badly. A novel TVS array based impulse suppression device with changeable clamping voltage that works on 220V (phase voltage) power line to protect low voltage apparatus is proposed in this paper. The idea of this TVS array based novel impulse suppression device, which works under the synchronization with power line voltage and employs economical TVS array as its actuator, is proposed. The design of hardware of device, which consists of actuator part, voltage transformation part and controller, is introduced. The synchronization algorithm employs hybrid digital filter is described. The straightforward control strategy of this device is introduced. The simulation and test results show effects of this novel device with different TVS array compared with device with TVSs with single clamping voltage, and demonstrate that this device can suppress impulse that happens not only at the peak but also at other place of waveform of power line voltage with better performance.