Transformer based AC pulse regulation systems

The paper is devoted to investigation of the pulse modulated systems with constant impedance load based on the application of auto-transformers in the primary circuit of pulse converters allowing to provide operation of a system with restricted range of modulated load signals and such operation conditions allow to obtain better electro-magnetic compatibility of converter with AC network without application of special filtering equipment but to respect to switches - with smaller current and voltage stresses. In the paper the main characteristics of autotransformer´s circuits giving possibility to provide engineering calculations are discussed in respect to the adjustability of the constant impedance load and operation parameters of the system. Some application examples are discussed - for instance for stabilizing of AC voltage of load with the changes of supply grid voltage.