DEVICE FOR NON-CONTACT ADJUSTMENT OF AMPLITUDE OF ALTERNATING VOLTAGE Russian patent published in 2008 - IPC G05F1/24 H02M7/12 

FIELD: electric engineering.

SUBSTANCE: device contains a supply of sinusoidal voltage with following parts coupled at the input: full-wave rectifier circuit with grounded negative pole and circuit of phase-impulse control, first and second unidirectional controlled keys, a kicking coil, first and second circuits with common point of connection of thyristor anodes in each one of them, cathodes of diodes and outputs of capacitors, remaining outputs of which are grounded, and load resistance. Introduced additionally is a power transformer with identical first and second oppositely connected primary windings, ends of which are combined in one point and grounded, and their other ends are connected to thyristor cathodes, anodes of each diode are connected respectively to cathodes of unidirectional controlled switches, controlling outputs of first and second unidirectional controlled switches are connected to corresponding outputs of phase-impulse control circuit, to two other outputs of which control contacts of thyristors are connected, while capacitors and first and second primary windings of power transformer, which constitute LC-contours, are adjusted to frequency of sinusoidal voltage supply, and contacts of secondary winding of power transformer are connected to load resistance.

EFFECT: non-contact adjustment of sinusoidal voltage amplitude, simplified design.

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