CIRCUIT OF POWER RATIO CONTROL AND GRID SOURCE OF POWER SUPPLY Russian patent published in 2013 - IPC H02M1/42 G05F1/565 G05F1/70 H05B41/282 

FIELD: electricity.

SUBSTANCE: circuit (10) of power ratio control comprises input units (n1, n2), which receive rectified input voltage, being rectified input voltage of an electric grid, and an excitation circuit (IC1), which excites a switch (M1). The serial assembly of a switch and a throttle (L1) is installed between input units. The serial assembly of a rectifier (D1) and an input capacitor (C2) is arranged in parallel to the throttle (L1). The rectifier does not conduct current, when the switch is closed. The excitation circuit excites the switch to generate sinusoidal current via a switch, which is synchronised with sinusoidal voltage of input voltage of the electric grid. Due to layout of the output capacitor in the circuit of power ratio control, the output capacitor may be charged only after the first cycle of conducting the switch current. The advantage of this layout is the fact that the start-up current does not arise before or after the first cycle of switch current conducting.

EFFECT: increased reliability.

12 cl, 9 dwg