HARMONIC SIGNAL SHAPING DEVICE (ALTERNATIVES) Russian patent published in 2005 - IPC

FIELD: electrical engineering; generation of electric waves affording several output signals.

SUBSTANCE: proposed device that can be used for shaping two- or three-phase signal for setting ac drive current or voltage, as well as for other industries where two- or three-phase adjustable-frequency voltages or currents of strictly sine waveform precisely shifted in phase through 90 or 120 deg. are required and provision is to be incorporated for varying phase sequence is available of two design alternates, one for shaping two-phase harmonic signal and other one, for shaping three-phase harmonic signal. Both alternatives are capable of shaping additional sine-wave output signals for controlling current direction to provide for vector control of electric drive and also continuous cyclic shaping of harmonic-signal period without distortion of its waveform, as well as for synchronizing all output signals with supply mains voltage. Device of first design alternate meant for shaping two-phase harmonic signal has control unit 1, variable-frequency oscillator 2, counter 3, digital units 11, 12 used for shaping trigonometric functions, unit 13 of voltage control signal coordinate converters, unit 14 of current direction control signal coordinate converters, desired voltage computing unit 9, desired current computing unit 10, motor speed computing unit 5, absolute slip parameter computing unit 6, selector switch 7, supply mains voltage synchronizing unit 4, absolute slip parameter shaping unit 8, and relevant connections.

EFFECT: enlarged functional capabilities.

4 cl, 4 dwg