What is EVS (PWM continuous back-Boost) stabilizer?
A. The EVS stabilizer series consists of an Electronic Power Controller module per phase, which supplies an in phase, or out of phase voltage to the primary of a buck/boost transformer, it’s secondary being connected between the supply in and the load. The controller module can thus add or subtract a voltage to the supply. The two four quadrant bi-directional switches produce the electronic power controller function; these switches consist of IHBT and power diodes that are used to chop the input voltage at 20 kHz, with the pulse width dependent upon the required output voltage. The control PCB compares the 50 Hz stabilizer output used to control that of a stable reference voltage, the error being used to control the two bi-directional switches. The high frequency PWM waveform is then alter and supplied to the primary of the buck boost transformer; the secondary voltage then adds or subtracts an appropriate voltage to provide a stable output voltage. The speed of responses is very fast
