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Because of the series buck-boost transformer, there is no switching of taps or otherwise a break in power path.
The high frequency Insulated Gate Bi-polar Transistor (IGBT) driven converter engine takes the incoming ac power, measures against the nominal voltage and adds or subtracts voltage, 20,000 times per second, to achieve real-time compensation of voltage disturbances, sag or swell. All this is achieved within 20 milliseconds through seamless PWM compensation of voltage so that all voltage disturbances are corrected within ITIC curve for flawless operation of electronics.