Static Voltage Stabiliser (SVS):
IGBT based PWM technology with Digital Signal Processor (dsPIC) Control System
Single Phase Aircooled 3 kVA - 25 kVA
Three Phase Aircooled 3 kVA - 200 kVA
Static Voltage Stabiliser is a PWM-type buck-boost voltage stabiliser based on IGBTs with tight regulation and a fast correction speed. This stabiliser is a mains voltage stabiliser of the SMPS type (AC input and AC output) with a novel switching topology in which PWM is generated directly in AC-to-AC switching with no harmonic distortion. There is no need to convert the AC input to DC and then back to regulated AC output in this topology, simplifying the design, reducing the number of components, and increasing efficiency and reliability. The power stage is controlled by an IGBT chopper, and the chopping frequency is around 20 KHz, ensuring absolute silence and pure sine wave output (no waveform distortion). The difference voltage is switched via IGBT and is added or subtracted from the mains voltage. This is accomplished electronically, with no step changes in voltage when the system regulates, through a feedback control system and a digital signal processor (dsPIC). The dsPIC senses the output voltage and makes corrections by varying the duty cycle of the PWM.