FIELD: electricity.
SUBSTANCE: excitation circuit (D6, C8, C9, L1) charges capacitor (C6) of intermediate circuit from AC voltage of converter (V1, V2). Parallel to capacitor (C6) of intermediate circuit there is a circuit of voltage limitation connected (R8, R3, D5, R4, R5, C3, SD). Scattering element (R8) in circuit of voltage limitation (R8, R3, D5, R4, R5, C3, SD), as maximum value of voltage on capacitor (C6) on intermediate circuit is exceeded, transforms electric energy into thermal energy. Current via measuring resistance (R3), measured via voltage (UR3) at the latter, is registered in delay circuit (R4, R5, C3) and is used to control disconnecting circuit (SD) of converter (V1, V2).
EFFECT: improved power coefficient.
14 cl, 1 dwg
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