MULTIPOINT FREQUENCY-PULSE WIDTH VARIABLE VOLTAGE REGULATOR Russian patent published in 2011 - IPC H02M5/293 

FIELD: electricity.

SUBSTANCE: multipoint frequency-pulse width variable voltage regulator consists of series-connected task signal source, the first summing unit and integrating device the output of which is connected to the inputs of the second summing unit the output of which is connected to the second input of the first summing unit. The inputs of the three comparator units are connected to the outputs of the corresponding relay elements. The device includes three key elements; each element is connected between the source of corresponding phase of three-phase voltage source and load connected according to star-connected circuit with naught output. The output of the second and the third comparator units are connected to the control input of the second and the third key elements correspondingly. The device also has the fourth comparator unit and dynamic D-trigger. Note that the input of the fourth comparator unit is connected to power input of the first key element, the output of the fourth comparator unit is connected to C-input of D-trigger, D-input of D-trigger is connected to the output of the first comparator unit and the output of D-trigger is connected to the control input of the first key element.

EFFECT: increased accuracy ensured by forming in the circuit of load of sine-curve voltage pack that consists of the whole number of circuit voltage periods.

5 dwg